JPH0745005B2 - Method for producing animal bone-containing filter material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing an animal bone-containing filter material used for removing impurities in liquid or gas, or for removing color, odor and the like.

(Prior Art) Conventionally, activated carbon, ferric oxide, ceramics and the like having an adsorbing action have been used for the purpose of filtering impurities, organic substances and the like in aqueous solutions and air, and removing colors and odors. However, although activated carbon and ferric oxide have a filtering function, they have a short life,
It cannot be reused after use, and since ceramics are inorganic substances, they do not react with organic substances, and for example, they did not function sufficiently as a filter material for wastewater containing organic substances.

Therefore, in addition to effectively purifying impurities including organic substances, ion exchange in water and air, adsorption and deodorization of odors, etc., it has various effects such as preventing food from spoiling and maintaining freshness. The present inventor has proposed an active material mainly composed of animal bones such as cow bones and a method for producing the same (for example, Japanese Patent Application Laid-Open No. 2-6306).

This active material is formed by kneading and baking calcined powdered animal bone and soil powder having a binding property, and then calcining. Due to the characteristic that the animal bone itself is porous, it is a filter material due to its adsorption action. As such, it exerts a sufficient function.

(Problems to be Solved by the Invention) An object of the present invention is to provide a method for producing a filter medium having a good adsorption performance with a further excellent adsorption effect.

(Means and Actions for Solving the Problem) The present invention is to remove raw materials of an animal by boiling it in a pressure cooker until the content of the organic matter becomes 2 to 25%, and then dry powder the animal. A method for producing a filter material containing animal bones, characterized in that bone powder, a binder aid having a binding property and alumina are mixed and kneaded, kneaded, granulated and then fired.

The ratio (weight ratio) of each component when molding the above-mentioned filtration material is
Usually, the proportion of animal bone powder is 14 to 42 parts by weight, preferably 20 to 35 parts by weight; alumina 7 to 21 parts by weight, preferably 10 to 18 parts by weight, relative to 100 parts by weight of the binding aid.

Further, it is effective to change the mixing ratio according to the application. For example, when a strong binding property is required, a relatively large amount of the binding aid may be mixed, and for applications requiring a stronger adsorptive property and alkalinization, a large amount of bone powder may be mixed.

Raw animal bone itself contains organic components such as gelatin, fat and protein in addition to bone components mainly composed of calcium. Organic matter is removed by boiling this raw bone using, for example, a pressure cooker. To do. At this time, the boiling time is adjusted so that the organic matter is not completely removed but the organic matter remains in an amount of 2 to 25%, preferably 3 to 10%. Then, the animal bone in a state in which the organic matter remains is dried and pulverized, and a separately prepared binder aid and alumina are mixed, water is added and kneaded. And granulate in a state that contains organic matter,
This is fired at 700 to 1100 ° C. for about 2 hours. During this calcination, water and organic matter are evaporated and incinerated, whereby the organic matter is almost completely removed, and small bubbles are formed inside the granular filter material. As a result, the contact area between the filter material and the object to be filtered (liquid or gas) increases, and the contact area with the micropores in the animal bone powder also increases,
Adsorption is enhanced and good filtration performance is obtained.

(Example) The method for producing a filter medium of the present invention will be described with reference to the flowchart of FIG.

As animal bones used as a raw material for the filter material of the present invention, animal bones conventionally discarded at livestock farms and the like, particularly animal bones having a large amount of hard bones such as cows, horses and sheep, are adopted. The bones of pigs, boars, etc., have a large amount of cartilage, and most of them are melted during the boiling process during production, so they are not suitable for use as a raw material.

First, the raw bone described above is prepared (step S1). The prepared raw bone is cut to an appropriate size, crushed (step S2), and then put into a pressure cooker (compression cooker) and boiled (step S2).
3). This boiling is usually performed at about 200 to 300 ° C for about 90 minutes. By this boiling step, gelatin and fat other than bone components attached not only to the outside of raw bone but also to the pores of bone,
Organic substances such as proteins, glue and blood are eluted and separated and removed. However, these organic substances are not completely separated and removed under the conditions of the above boiling temperature and time, and the organic substances remain.

At this time, if the boiling temperature is obviously lower than the above or a short time, the remaining amount of organic matter is too large, and in the subsequent firing step (step S8), combustion of organic matter and smoke generation are remarkable, environmental pollution and work discomfort, equipment It is not preferable because it causes damage. In addition, the number of bubbles formed in the firing step is too large and the adsorption action is reduced.

On the other hand, if the boiling conditions are higher than the above or for a long time, most of the organic substances are removed, and it is not possible to form an appropriate number of bubbles according to the features of the present invention in the subsequent firing (step S8).

Next, the bone whose residual amount of organic matter is reduced to 2 to 25%, preferably 3 to 10% by boiling is dried (step S
Four). This drying is performed using a freeze dryer or a dryer at 100 to 200 ° C.

Then, the dried animal bone is made into powder of 30 to 100 mesh using a powder machine (step S5). Animal bone meal like this
Calcium (Ca) as the main component, phosphorus (P), magnesium (Mg), barium (Ba), sodium (Na), sulfur (S), potassium (K), aluminum (Al), iron (Fe), zinc It is made of (Zn), copper (Cu), nickel (Ni), etc., and countless micropores exist inside and outside the powder particles, and PH is alkaline because it contains calcium etc. .

Next, the above-obtained animal bone powder is mixed with a binder aid made of clay or the like and alumina, and kneaded until the whole becomes uniform (step S6). Alumina acts as a reinforcement to strengthen the bond. Then, it is granulated with a granulator into granular tablets having a diameter of 1 to 5 mm (step S7). In addition,
The above size is easy to handle, but the size is not limited to the above range.

An example of a preferable mixing ratio (weight ratio) when used as a waste water filter is shown in the following table.

Next, the granules granulated in the above step S7 are put in a firing furnace and usually fired at around 700 to 1100 ° C. for about 2 hours (step S
8). Then, as it is, it is naturally cooled for about 60 minutes in the furnace and returned to room temperature or a state close to this. Then, it is preferably sealed and stored in a non-breathable package, and taken out as needed for use.

If organic substances other than bone components such as gelatin, fats, proteins, and glues remain in the granules, it causes oxidative decay, but by passing through the above-mentioned baking step, the remaining organic substances can be completely removed, and water content can be removed. And the organic matter is evaporated and incinerated to form air bubbles inside the granular tablet. at the same time,
The humidity (moisture) in the bone can be lowered to several percent or less, preferably to almost 0%.

At this time, if the firing conditions are clearly lower temperature or shorter time than the above, the bone will be carbonized, and conversely, if it is high temperature or super time, the bone will become ash, and in any case The desired function of the present invention will not be exhibited.

It is also possible to freeze and dry immediately after firing,
It is not preferable because the humidity of the granules is increased by the rapid cooling and the PH value of the granules is decreased (acidified) by the humidity. It is also not preferable in terms of preventing cracks. After the firing, if the temperature is kept at room temperature and then freeze-dried, the dried state becomes more stable.

According to the above conditions, the bone powder contained in the granule tablet is whitened and maintains the original tissue state having innumerable pores. at the same time,
Bubbles are formed inside the granule tablet, and when this is used as a filter medium, the contact area with the substance to be filtered such as liquid or gas is increased, the adsorption action is enhanced, and the filtration performance is further improved.

In the present invention, the organic substance added to form air bubbles in the filter medium is an organic substance originally contained in raw bone, and the amount thereof is adjusted by the boiling temperature or the boiling time. There is an advantage that the step of mixing by mixing can be omitted and the manufacturing of the filter medium can be simplified.

According to the filter material produced by the method according to the present invention,
Since the material forming the bone is generally harmless to the human body, the filter medium does not harm the human body, and since the atmosphere of liquid or air is changed from the acidic side to the neutral to alkaline side, for example, By passing tap water, weak alkalinization (ionization) of water that is preferable for the human body can be achieved, and by circulating indoor air, weak alkalinization and purification accompanied by sterilization can be performed. Further, by passing organic wastewater through this filter medium, it can be purified by alkalizing or neutralizing it.

In addition, it can be used as an active material for maintaining the freshness because it can prevent the decomposition of organic substances or prevent the organic substances from adsorbing or aggregating and thereby acidifying the liquid or air.

Further, by disposing the active material of the present invention in a cooling tower, a solar water heater, or the like, it is possible to prevent the generation of green algae and prevent water from spoiling.

Since the filter material of the present invention used for these has fine pores in the calcined animal aggregate, the impurities adhering to the filter material are released by washing and can be used permanently.

(Effects of the Invention) As described in detail above, according to the present invention, the animal bone powder containing an organic substance, the binder aid and alumina are mixed, granulated, and then fired to obtain a filter material having bubbles. Therefore, the area in which the innumerable pores of the animal bone itself come into contact with the substance to be filtered is increased, the adsorption action is enhanced, and the animal bone-containing filter material excellent in filtration performance can be obtained.

[Brief description of drawings]

FIG. 1 is a flow chart showing the manufacturing process of the filter medium of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B01D 53/81 B01J 20/02 7202-4G

Claims (1)

[Claims] 1. A raw material of animal bones is boiled in a pressure cooker to remove organic matter until the organic matter content becomes 2 to 25%, and then dried into a powder, which is a tie aid for binding to the animal bone meal. A method for producing a filter material containing animal bones, which comprises blending water with alumina, kneading the mixture, granulating the mixture, and calcining the mixture.