JP6975389B2 - Evaluation method of materials for marine areas and manufacturing method of materials for marine areas using this - Google Patents

Description

The present invention relates to a method for evaluating materials for marine areas and a method for manufacturing materials for marine areas using the same.

Conventionally, natural stones and natural sand have been used to cover sand for improving the environment of the sea area, creating seaweed beds, and improving the water quality of rivers, etc., but from the viewpoint of conservation of natural resources and suppression of mountain mining, etc. , The use of various by-products as alternative materials is being considered. Among them, the steelmaking slag produced from the steelmaking process is similar in shape to natural stone and natural sand, the origin of the steelworks faces the sea area, stable supply is possible, and heavy metals. It is being used as a promising alternative material because it does not elute.

When using various by-products as materials for marine areas such as modifiers for sand covering, it is necessary to confirm in advance that there is no adverse effect on the environment. As an example of such a confirmation method, a method for confirming the degree of increase in pH due to the elution of calcium ions from the calcium mineral contained in the above-mentioned steelmaking slag is disclosed (Non-Patent Document 1).

Furthermore, since sand cover is intended to improve the environment of the sea area such as prevention of red tide and blue tide, the effect of improving the environment of the material for the sea area used as a modifier is also prepared in advance by a simple method. It is preferable to be able to confirm.

As an example of environmental improvement by the modified material and its mechanism, when steelmaking slag is used, iron in the steelmaking slag, especially divalent iron ions, converts hydrogen sulfide generated from the bottom mud into iron sulfide. , It has been reported that the generation of hydrogen sulfide can be prevented (Patent Documents 1 and 2).
Further, in connection with this, the present inventors have clarified that the sulfide concentration in water can be reduced by laying steelmaking slag having a high total iron (total Fe) content in the sediment (). Patent Document 3).

Japanese Unexamined Patent Publication No. 2004-116260 Japanese Unexamined Patent Publication No. 2005-34140 Japanese Patent No. 5994383

"Guide for the use of converter steelmaking slag in sea areas", Japan Iron and Steel Federation, September 2008, p.48-51

However, some materials for marine areas have a high total Fe content but a low content of divalent iron ions. Therefore, only the total Fe content suppresses sulfides in all marine materials. Performance cannot be evaluated. In addition, a method for measuring the amount of divalent iron ions present in materials for marine areas in a solid state has not been clarified so far.
Moreover, among the materials for marine areas, the iron content of steelmaking slag, whose sulfide suppression performance can be predicted to some extent by the total Fe content, has been decreasing in recent years. This is due to the improvement of the steelmaking process and the recovery of iron (bullet) from steelmaking slag in order to increase the yield of steel, which is the main product. Therefore, when the total Fe content is used as an index of the sulfide suppression performance, it may be determined that many slags are inferior to the performance.
As described above, a method for easily evaluating the sulfide suppression performance of materials for marine areas has not been established at present.

Due to the above situation, when evaluating the sulfide suppression performance of materials for marine areas, a method of putting materials for marine areas to be evaluated into the actual sea area and observing the progress, or reporting in Patent Document 3. As shown in the above, a method is adopted in which a test environment that imitates the actual sea area is prepared using the sediment collected from the actual sea area, and materials for the sea area to be evaluated are put into this and the progress is observed. The problem is that it takes time, effort and cost to confirm the performance.
Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a method capable of easily evaluating the sulfide suppression performance of a material for marine areas.

The present inventor conducted various studies to solve the above problems, and found that the amount of dissolved sulfide in the aqueous solution was reduced when the material for the sea area was brought into contact with the aqueous solution containing dissolved sulfide for a certain period of time. , The present invention has been completed by finding that the hydrogen sulfide suppressing ability of the material for the sea area can be determined.

That is, one embodiment of the present invention for solving the above-mentioned problems is a method for evaluating a material for a massive and / or powdery sea area, which has a certain dry mass and is a material for a massive and / or powdery sea area. To prepare an aqueous solution having a constant dissolved sulfide concentration ( _{CS, 0} ), to bring the material for the sea area into contact with the aqueous solution for a certain period of time, and to make the dissolved sulfide concentration in the aqueous solution after contact (CS, 0). C _S, measuring _t), solution exist sulfide concentration _{(C S, t),} reduction of the concentration before the contact _{(C S, 0) (ΔC} S = C S, 0 -C S, t ), And a judgment test of the sulfide suppression capacity by calculating the sulfide suppression capacity of the material for the sea area and passing the material for the sea area where the sulfide suppression capacity exceeds a certain value is passed. This is an evaluation method for materials for marine areas, including.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method capable of easily evaluating the hydrogen sulfide suppression performance of a material for marine areas.

The flow chart which shows the procedure of the evaluation method of the material for the sea area which concerns on one Embodiment of this invention. Schematic diagram showing a part of the operation in the determination test of the amount of suspended matter carried out in one embodiment of the present invention. Schematic diagram showing a part of the operation in the determination test of the sulfide suppression ability carried out in one embodiment of the present invention.

Hereinafter, an embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail, but the present invention is not limited to the embodiment. In addition, the mechanism of action described below includes estimation, and its correctness does not limit the present invention. The description of the numerical range (the description in which two numerical values are connected by "~") means that the numerical values described as the lower limit and the upper limit are also included.

The evaluation method of the material for the sea area according to the present embodiment is to prepare a bulky and / or powdery material for the sea area having a certain dry mass, and to prepare an aqueous solution having a _{constant dissolved sulfide concentration (CS, 0).} To do so, to bring the material for the sea area into contact with the aqueous solution for a certain period of time _{, to measure the dissolved sulfide concentration (CS, t} ) in the aqueous solution after contact, and to measure _{the dissolved sulfide concentration (CS, t} ). of, based on the amount of decrease in the concentration before contact _{(C S, 0) (ΔC} S = C S, 0 -C S, t), calculating the sulfide suppression capability of the waters for material, and the Includes a sulfide suppression capacity judgment test by passing materials for marine areas where the sulfide suppression capacity exceeds a certain value.

The material for the sea area to be evaluated is not particularly limited as long as it is a lump and / or powder material used for sand covering as a reforming material, and is abolished in addition to steelmaking slag such as hot metal pretreatment slag and decarburized slag. It may be crushed concrete products such as concrete, waste of products containing gypsum such as shells and waste gypsum board, and various by-products such as coal ash, and natural stones and natural materials that have been conventionally used as materials for marine areas. It may be sand. Among them, steelmaking slag has a similar shape to natural stone and natural sand, the origin of the steelworks faces the sea area, and stable supply is possible, in addition to the effective use of by-products. It is also preferable in that it has advantages such as no elution of heavy metals.

The dry mass of lumpy and / or powdery marine materials to be tested shall be constant. As long as the dry mass is constant, the mass actually put into water may differ due to the difference in water content. In the present specification, the dry mass means the mass when dried in the air at 110 ± 5 ° C. until the mass change is negligible. It is enough.

As the aqueous solution containing the dissolved sulfide, a solution in which various sulfides are dissolved in water to a constant concentration is used.
The water used for preparing the aqueous solution is not particularly limited, and examples thereof include tap water, distilled water, and seawater. When the applicable sea area of the material for the sea area is decided in advance, it is possible to use the water in the sea area, or the water containing the ion species and the amount adjusted to imitate the water, to suppress hydrogen sulfide in the sea area. Is preferable because it can be evaluated more accurately. When preparing artificial seawater, dilute hydrochloric acid or the like can be used to adjust the hydrogen ion concentration in the water, that is, the pH.
The sulfide that dissolves in water is not limited as long as it is water-soluble or hydrolyzes to produce a water-soluble compound containing sulfur, and examples thereof include sodium sulfide, potassium sulfide, magnesium sulfide, and calcium sulfide. .. Among them, sodium sulfide can be prepared even with a high-concentration aqueous solution because it has high solubility in water, and when seawater is used as water, a large amount of sodium is contained in the water, so the composition by addition is added. It is preferable in that the fluctuation of can be reduced.
The concentration of the aqueous solution ( _{CS, 0} ) is also not limited as long as it is a constant value, and can be, for example, about 50 to 400 mg / L in the case of a sodium sulfide aqueous solution. When the applicable sea area of the material for the sea area is determined in advance, the concentration of dissolved sulfide in the sediment interstitial water in the sea area is measured in advance, and the aqueous solution concentration is determined based on the concentration. It is preferable because the suppression performance can be evaluated more accurately.

The method of contacting the material for the sea area with the aqueous solution containing the dissolved sulfide is not limited as long as the time of contact between the two can be confirmed and controlled. Therefore, a method may be used in which an aqueous solution containing dissolved sulfide and a material for marine areas are placed in a container in a fixed amount and allowed to stand for a certain period of time, but from the viewpoint of evaluating the hydrogen sulfide suppression performance in a shorter time, the solution is dissolved. A method in which an aqueous solution containing sulfide and a material for sea areas are placed in a container in a fixed amount and shaken or rotated in a closed state is preferable.
When adopting the method of shaking or rotating the container, the container needs to be sealable. This is to prevent the dissolved sulfide in water from being vaporized and lost by the energy of shaking or rotation, and the hydrogen sulfide suppressing ability is erroneously evaluated highly. From the viewpoint of further suppressing the loss of the dissolved sulfide due to vaporization, it is preferable to fill the container with water or replace the gas phase in the container with an inert gas such as nitrogen gas or argon gas. Furthermore, for blanks containing only an aqueous solution containing dissolved sulfide that does not come into contact with materials for marine areas, the amount of sulfide lost during shaking or rotation is corrected by measuring the change in the amount of dissolved sulfide due to shaking or rotation. Is more preferable.
When the method of shaking or rotating the container is adopted, it is preferable that the rotation speed of shaking or rotation is about 20 to 400 rpm and the shaking time is about 6 to 72 hours. If the rotation speed of shaking or rotation is too small or the time is too short, the contact between the material and water and the accompanying reaction with hydrogen sulfide may not occur sufficiently, and the hydrogen sulfide suppression performance may be erroneously underestimated. There is. On the other hand, if the rotation speed of shaking or rotation is too high, the shaker is burdened and the water temperature rises due to frictional heat, and there is a concern that the hydrogen sulfide suppression performance may be erroneously evaluated. In addition, if the shaking time is too long, the added dissolved sulfide may be lost as hydrogen sulfide gas, etc., depending on the sealing performance of the container, and the hydrogen sulfide suppression performance may be erroneously evaluated highly. be.

The method for measuring the amount of dissolved sulfide (CS _{, t} ) in the aqueous solution after contact is not particularly limited, and a method using a detector tube for sulfide, liquid chromatography, or the like can be adopted. The method using a detector tube is preferable because the measurement can be easily performed.

In the present embodiment, the dissolved sulfide concentration in the aqueous solution after contact with the waters for materials _{(C S, t),} reduction of the concentration before the contact _{(C S, 0) (ΔC} S = C S, 0 - _{Based on CS, t} ), the sulfide suppression capacity of the material for the sea area is calculated, and the hydrogen sulfide suppression capacity of the material for the sea area is evaluated based on the result. Sulfide suppression capability, the dissolved sulfide reduction of the concentration multiplied by the amount of aqueous solution ([Delta] C _S) to calculate the total mass of the sulfide which is fixed to the sea area for materials, volume or mass of waters for materials this It is calculated by dividing by. When the amount of the material for the sea area to be brought into contact with the aqueous solution is constant for each measurement, the total mass of the sulfide fixed to the material for the sea area itself may be used as the sulfide suppression ability.

In calculating the sulfide suppression capacity of the material for marine areas, the amount of lost dissolved sulfide during contact between the material for marine areas and the aqueous solution may be corrected by using a blank. _{In this case, the dissolved sulfide concentration (Cs, b} ) was measured for the blank treated under the same conditions as the contact between the aqueous solution and the material for the sea area, except that the material for the sea area was not put in the container, and the solution was dissolved. sulfide concentration _{(C s, b)} of the reduction amount from the dissolved sulfide concentration of the aqueous solution prior to said contacting _{(C S, 0),} loss of dissolved sulfide concentrations _{(C loss = C S, 0} -C S _, calculated as _b), decrease in the concentration of dissolved sulfide by using this value ([Delta] C _S),

ΔC _s = _{CS, 0-} CS _{, t} + C _loss

And.
By correcting the amount of lost dissolved sulfide, it is possible to more accurately evaluate the hydrogen sulfide suppression capacity of materials for marine areas.

The threshold value for pass / fail judgment can be appropriately determined in consideration of the amount of sulfide contained in the bottom sediment of the sea area to which the material for the sea area is applied, the thickness of the material applied to the sea area, and the like. For example, when a material for sea areas is applied to a sediment containing 200 g / m ³ of sulfide with a thickness of 30 cm to suppress sulfide, 200 g of sulfide is fixed per ^{0.3 m 3 of material for sea areas.} Since it is necessary, the threshold value for pass / fail determination is 200 g / 0.3 m ³ ≈ 670 g / m ³ = 670 mg / L.

A preferred embodiment of the present embodiment is a combination of a test for determining the amount of suspended matter in a material for marine areas.
Materials for marine areas often contain fine particles generated by collision of particles during handling such as crushing and transportation for particle size adjustment. Of these fine particles, hydrophobic ones do not sink when put into water, but float near the surface of the water and stay for a long time, which causes water pollution. Therefore, in the evaluation of materials for marine areas, it is preferable to evaluate the amount of suspended matter when put into water. In particular, when steelmaking slag is used as a material for marine areas, it often contains a large amount of fine particles due to crushing when recovering the contained metal, so it is important to properly evaluate the amount of suspended matter. Is.

In the judgment test of the amount of suspended matter in the material for the sea area, prepare the material for the sea area with a certain dry mass, put the material for the sea area into the water and let it stand for a certain period of time, and the floating matter floating on the water surface after standing. By collecting, drying the collected suspended matter, measuring the mass of the dried suspended matter, and passing the material for the sea area where the mass of the suspended matter is below a certain value. conduct.

As the material for the sea area to be used for the test, the material sampled from the material to be judged may be used as it is, or it may be used by undercutting with an appropriate eye sieve. The dry mass of the materials used for the sea area is constant. As long as the dry mass is constant, the mass actually put into water may differ due to the difference in water content.

The water into which the material for the sea area is input is not particularly limited, and examples thereof include tap water, distilled water, and seawater. If the applicable sea area of the material for the sea area is decided in advance, it is more accurate to use the water in the sea area, or the water containing the ion species and the amount adjusted to imitate the water, to obtain more accurate amount of suspended matter. It is preferable because it can be evaluated. When preparing artificial seawater, dilute hydrochloric acid or the like can be used to adjust the hydrogen ion concentration in the water, that is, the pH.
The shape and material of the container for accommodating water are not limited as long as the state of floating or subsidence of the introduced sea area material can be observed from the outside. As for the volume, it can be appropriately used according to the amount of materials for the sea area to be tested. From the viewpoint of workability, it is preferable to use a material having a volume that is at least twice the bulk volume of the material for the sea area to be tested. Examples of preferable containers include tubular containers and buckets having a volume of 500 mL to 5 L.

The time for putting the material for the sea area into the water and letting it stand still can be from the time when the material is put into the water until the sedimentation of the coarse particles and the hydrophilic fine particles is almost completed. An example of the standing time is about 24 hours.

The method of collecting the suspended matter after standing is not particularly limited, and a method of scooping the suspended matter with an appropriate size scoop or the like and then filtering it, or a method of sucking the suspended matter together with water with a pump or the like and then filtering it. The method of doing so can be applied.

The collected suspended matter is dried under the condition that the moisture adhering to the surface of the suspended matter particles and the moisture in the voids (open pores) having openings on the particle surface can be completely removed. As an example of the drying method, there is a method of transferring the collected suspended matter to a heat-resistant dish such as a petri dish and holding it in an oven set at 110 ° C. In this case, the determination that the drying is completed may be made based on the fact that the mass of the suspended matter does not change.

The dry mass of the suspended matter is measured by a mass measuring means having an accuracy according to the threshold value of the pass / fail judgment described later. As an example, when a steelmaking slag of about 1 kg is subjected to a test, the threshold value for pass / fail judgment is often 0.005 g or less, so a scale capable of measuring up to 0.001 g (1 mg) is used.

It is preferable to set the threshold value for pass / fail judgment in consideration of the actual condition of the sea area to which the material for the sea area is applied, in addition to the particle size and input amount of the material for the sea area to be judged. For example, the dry weight of suspended matter when 1000 g of a material having a particle size range of 0 to 10 mm is dropped into water is set to 0.005 g or less.

Another preferred embodiment of the present embodiment is a combination of a pH increase determination test. The pH increase determination test is performed by the method described in Non-Patent Document 1 described above.

Needless to say, tests other than those described above, for example, tests based on laws and regulations such as "judgment criteria for bottom sediment" may be combined. The "Judgment Criteria for Underwater Sediment" is the landfill site specified in Article 5, Paragraph 1 of the Ordinance for Enforcement of the Act on Prevention of Marine Pollution, etc. It is stipulated in the "Ministerial Ordinance that Establishes Judgment Criteria for Wastes Containing Metals, etc. to be Discharged". When combining these tests, perform operations such as measuring the concentration in the eluate for some or all of the items stipulated by laws and regulations, and pass or fail based on the standard values stipulated for each item. judge.

This embodiment is applied to a method for manufacturing materials for marine areas, and it is preferable that only those manufactured materials for marine areas that have passed each test are accepted products.
At that time, for the materials for marine areas that failed the above-mentioned determination test of the amount of suspended matter, the amount of suspended matter was reduced by performing at least one of particle size adjustment, washing, and adjustment of the water content, and the determination was made. You may pass the exam. Here, the reason why the amount of suspended matter is reduced by adjusting the water content is that the fine particles aggregate and coarsen due to the surface tension generated by the cross-linking of water existing on the surface of the fine particles, and settle in water. Conceivable. When preparing the water content, it is preferable that the amount is 2% by mass to 20% by mass. By setting the water content of the material for marine areas to 2% by mass or more, the surface tension acting on the fine particles becomes sufficiently large for aggregation. On the other hand, by setting the water content of the material for the sea area to 20% by mass or less, it is possible to suppress a decrease in surface tension due to the filling of the voids between the fine particles with water.
It should be noted that the above-mentioned adjustment of the particle size or the water content can also serve as the particle size adjustment or cleaning, which is a necessary measure when it is determined to be unsuccessful in the pH determination test conducted separately, and therefore, in the actual production method. It is preferable in that the procedure is simplified.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Five types of derinsed lag are used as materials for lumpy and / or powdery marine areas, and the pH rise judgment test, suspended matter amount judgment test, sulfide suppression ability judgment test, and heavy metal elution judgment test are performed in the sea area. We evaluated the materials for the product. FIG. 1 shows the evaluation flow.

For the pH increase determination test, the method described in Non-Patent Document 1 described above was adopted. The threshold value for pass / fail judgment was set to 9.0, which is the upper limit specified in the pH drainage standard (sea area) according to the Water Pollution Control Law.

Materials for marine areas that failed the pH increase determination test were subjected to the test again after adjusting the particle size by re-sieving treatment. FIG. 1 shows the judgment tests up to the second time, but even if the judgment test fails the second time, if the excess to the upper limit value is 0.2 or less, the particle size is further increased. Adjustment or cleaning was performed, and the judgment test was performed up to 5 times.

The judgment test of the amount of suspended matter was carried out by the following procedure.
First, from the materials for marine areas, those having a particle size of 10 mm or less were selected by a sieve, and a 1.0 kg judgment sample was prepared.
Next, this determination sample was put into 2 L of artificial seawater in a cylindrical container having a volume of 3 L, and then allowed to stand for one day.
Next, the suspended matter remaining on the water surface after standing was collected together with the water with a spoon, and the adhering water was removed by filtration and drying.
Finally, the mass of the suspended matter after drying was measured, and when it was 0.005 g or less, it was determined to be acceptable, and in other cases, it was determined to be unacceptable.
FIG. 2 schematically shows the operation from the charging of the judgment sample to the collection of the suspended matter described above.

Materials for marine areas that failed the judgment test for the amount of suspended matter were subjected to cleaning treatment to adjust the water content, and then subjected to the test again. FIG. 1 shows up to the second judgment test, but even if the second judgment test fails, the particle size is further increased for those with a slight excess of 0.001 g or less with respect to the upper limit. Adjustment, washing or moisture adjustment was carried out, and the judgment test was carried out up to 5 times.

The judgment test of the sulfide suppression ability was carried out by the following procedure.
First, the sodium sulfide reagent was dissolved in artificial seawater so as to be 100 mg / L in terms of S, and then the pH was adjusted to 8.0 to 8.2 with concentrated hydrochloric acid diluted 2-fold with distilled water. , An aqueous solution containing dissolved sulfide was prepared.
Next, 300 mL of this aqueous solution and 10 g of the material for the sea area to be determined were placed in a 500 mL glass screw cap bottle, sealed tightly, and shaken at a rotation speed of 200 rpm in a state where they were in contact with each other. The shaking time was 48 hours.
Next, the screw cap bottle after shaking was opened, a Kitagawa-type sulfide detector tube was inserted into the aqueous solution, and the concentration of dissolved sulfide in the aqueous solution was measured.
Finally, the measured dissolved sulfide concentrations _{(C S, t),} decrease from the initial sulfide concentration _{(C S, 0 = 100mg /} L) (ΔC S = C S, 0 -C S, t ), The total mass of the sulfide fixed to the material for the sea area was calculated, and it was determined that the case where the total mass was 800 mg or more was passed and the other cases were rejected.
The operation from the sealing of the screw cap bottle to the insertion of the detector tube described above is schematically shown in FIG.

The elution judgment test for heavy metals, etc. was conducted based on the judgment criteria for bottom sediment, and it was confirmed whether or not some of the specified items were within the specified range.
The above test results are summarized in Table 1.

Material 1 is an example in which the pH increase, the amount of suspended matter, the sulfide suppressing ability, and the elution of heavy metals and the like have all passed the determination tests, and the shipping determination has passed.
Although the material 2 failed the pH increase determination test, it passed the test by re-sieving, and passed the determination test of the amount of suspended matter, the ability to suppress sulfide, and the elution of heavy metals, etc. Is an example of passing.
Although the material 3 failed in the judgment test of the amount of suspended matter, it passed by the treatment for adjusting the water content to 2 to 20% by mass, and each judgment of pH increase, sulfide suppression ability and elution of heavy metals and the like was made. This is an example of passing the shipping judgment because it passed the test.
Material 4 and Material 5 are examples in which the shipping determination is unsuccessful because the determination test for the sulfide suppression ability is unsuccessful.
As described above, appropriate materials could be selected by performing pass / fail judgments by various judgment tests including a judgment test of sulfide suppression ability.

According to the present invention, the sulfide suppression ability of a material for marine areas can be determined by a simple method. Therefore, if the present invention is applied to the pre-shipment inspection of materials for marine areas, it is useful in that it is possible to determine whether or not to ship the material focusing on the sulfide control ability in a short time and at low cost. Further, the present invention is useful in that the amount of suspended matter that causes water pollution when the material for sea area is put into water can be determined by a simple method by the determination test of the amount of suspended matter of the material for sea area. .. Furthermore, the present invention can obtain a lot of information on materials for marine areas, which could not be obtained in the past, by combining with other evaluation methods such as a pH increase determination test and a heavy metal elution determination test. It is also useful in that it can be done.

Claims (8)

A method for evaluating bulk and / or powdery materials for marine areas.
Preparing bulk and / or powdery marine materials with a constant dry mass,
Preparing an aqueous solution with a constant dissolved sulfide concentration ( _{CS, 0),}
Bringing the material for the sea area into contact with the aqueous solution for a certain period of time,
Measuring the dissolved sulfide concentration ( _{CS, t} ) in the aqueous solution after contact,
Of solution exist sulfide concentration _{(C S, t),} reduction of the concentration before the contact _{(C S, 0) (ΔC} S = C S, 0 -C S, t) on the basis of, of the waters for Material To calculate the sulfide suppression capacity, and to pass the materials for sea areas where the sulfide suppression capacity exceeds a certain value.
Determination test of the sulfide suppression capability by, and
Preparing bulk and / or powdery marine materials with a constant dry mass,
Putting the materials for the sea area into the water and letting them stand for a certain period of time,
Collecting floating matter floating on the surface of the water after standing,
Drying the collected suspended matter,
Measuring the mass of the dried suspended matter, and
Accepting materials for marine areas where the dry mass of the suspended matter is below a certain value,
Evaluation method of materials for marine areas, including a test for determining the amount of suspended matter by. The method for evaluating a material for a sea area according to claim 1, wherein the contact between the aqueous solution and the material for the sea area is performed by putting the aqueous solution and the material for the sea area in a container, sealing the container, and shaking or rotating the container. .. The method for evaluating a material for marine areas according to claim 2, wherein the shaking or rotation is performed in a state where the container is filled with the aqueous solution or a space in the container is replaced with an inert gas. _{The dissolved sulfide concentration (Cs, b} ) was measured for the blank treated under the same conditions as the contact between the aqueous solution and the sea area material, except that the material for the sea area was not put in the container, and the dissolved sulfide concentration was measured. The amount of decrease in (Cs _{, b ) from the dissolved sulfide concentration (CS, 0} ) of the aqueous solution before the contact is defined as the lost dissolved sulfide concentration (C _loss = _{CS, 0-} CS _{, b} ). calculated, using該逸loss of dissolved sulfide concentrations _{(C loss),} decrease of the dissolved sulfide concentrations ([Delta] C _S), you correction _{ΔC s = C S, 0 -C} S, and _{t + C loss,} The method for evaluating a material for marine areas according to any one of claims 1 to 3. The method for evaluating a material for a sea area according to any one of claims 1 to 4 , wherein the material for the sea area is one or more types of steelmaking slag selected from hot metal pretreatment slag and decarburization furnace slag. It is a manufacturing method of materials for marine areas.
The manufactured marine materials are inspected by the evaluation method for marine materials according to any one of claims 1 to 5 , and only those that pass each judgment test are accepted as acceptable products. Manufacturing method of materials for. A claim that includes adjusting at least one of the particle size and the water content of a material for marine areas that has failed the determination test for the amount of suspended matter, and then performing the determination test for the amount of suspended matter again to determine pass / fail. Item 6. The method for manufacturing a material for sea areas according to Item 6. The method for producing a material for marine areas according to claim 7 , wherein the water content is adjusted to 2 to 20% by mass in the adjustment of the water content.

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