JP3793794B2 - Ocean sand drift test sand - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to test sand for sand drift survey used in ocean surveys.
[Prior art]
One of the most important surveys in the ocean survey is the sand drift survey. In this survey, a fixed amount of test sand for sand drift survey is placed at a fixed point to be used as a moving base point, mesh points are set around the fixed point, and the sediment is quantitatively collected at each survey point over time. It analyzes the sand movement situation (sand drift situation).
[0003]
Until now, the sand for investigation was collected from the investigation sea area, and fluorescent sand was applied to this sand to produce fluorescent sand. This is to measure the amount of movement by counting how much fluorescent sand is contained in the collected sample under black light (ultraviolet light).
[0004]
[Problems to be solved by the invention]
The following various problems have been pointed out in the above method for producing fluorescent sand. Intricate operations such as sampling, washing, drying, sieving and application of fluorescent paint, drying, pulverization, and sieving are required, and production time and cost are too high. In addition, a large work place indoors and outdoors is required. Proven experience is required to produce uniform fluorescent sand.
[0005]
The following problems have been pointed out as test sand. The tracking period of the fluorescent sand accompanying the sand drift survey is usually from 3 hours to 3 months later. However, the fluorescent paint placed on the seabed is gradually removed due to wear during movement, and as time passes, Uniformity as test sand is reduced. Since the fluorescent paint of the sample sand is peeled off at the time of analysis, it is difficult to identify the thin fluorescent paint, and accurate data cannot be obtained, such as the complete one cannot be counted. When manufacturing test sand with materials other than local sand, it is very difficult to manufacture the same particle size and specific gravity as local sand.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention focuses on waste glass that is discharged in large quantities throughout the country and is required to develop new applications. By using those cullet as a raw material, the manufacturing process is simple and analyzed. We have provided test sand for sand drift investigation that allows easy identification of time.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
While the specific gravity of sea sand is 2.7 to 2.8, it occupies most of the waste glass discharged from the city, and the specific gravity of bottle glass generally called soda lime glass is 2.5. It is around and cannot be used as test sand.
[0008]
In order to obtain a specific gravity similar to that of sea sand, a conclusion was reached that a metal compound having a density higher than that of general soda-lime glass is added to the glass. There are many metal compounds for this purpose, but it is not preferable to use substances that affect the environment, such as lead compounds. In addition, bismuth compounds that are in the spotlight as lead substitutes are expensive. Among them, zinc oxide is one of the most preferable materials because it is colorless, inexpensive, non-toxic and already used as a glass raw material.
[0009]
In addition to general soda-lime glass, waste glass includes what is called electrical glass, such as television CRT glass and liquid crystal glass used in personal computers. Among CRT glass, glass and liquid crystal glass that do not contain lead in the front part called panel glass have the same specific gravity as sea sand with a specific gravity of 2.7 to 2.8, and can be used sufficiently as a raw material for test sand. .
[0010]
Glass for electrical use here is a generic term for bulb glass and plate glass used in the electrical and electronic industry described in page 126 of the encyclopedia of glass (Sakuo Sakuo, Asakura Shoten, first published in 1985). is there.
[0011]
The particle size of sea sand is in the range of about 0.075 to 2.0 mm according to the particle size test of JIS A 1204 soil. Therefore, the particle size of sea sand can be easily pulverized with a ball mill type pulverizer. Thereafter, glass powder having an arbitrary particle size can be extracted by sieving.
[0013]
Since sea sand in nature contains a wide variety of minerals, sand grains having various colors exist. Among them, in general, sand grains having a blue color tone are very rare.
[0014]
Focusing on this point, the glass sand of the present invention, for example, by using a blue cullet or by adding a colorant having a blue color tone in the melting process, in the case of analysis, by visual observation or by actual microscope Identification with a speculum can be facilitated.
[0015]
Further, in this method, since the colorant is dissolved in the glass as compared with the conventional method of applying the fluorescent paint, the influence of the peeling of the paint is reduced, and the analysis accuracy is improved.
[0016]
As the colorant, in the case of a blue system, a method of dissolving a compound such as iron, cobalt, or copper alone or in combination with another compound in glass is common.
[0017]
Among them, the coloration by cobalt ions is preferable for the present invention because it produces a very clear blue color regardless of the melting conditions.
[0018]
However, in order to obtain a color tone that can be distinguished from the color tone of sea sand, it is obvious that other metal compounds can be added in addition to the blue-based colorant.
[0019]
Sea sand in nature has a rounded shape with no corners due to long-term wear. On the other hand, since glass sand has an angular shape, it can be easily identified by visual inspection or inspection with an actual microscope.
[0020]
【Example】
Examples and comparative examples of ocean sand drift test sand according to the present invention will be described below. The following examples are for deepening the understanding of the form and effect of the present invention, and do not limit the present invention.
[0021]
[Example 1]
100 parts of blue cullet of waste glass and 20 parts of zinc oxide powder were weighed in a crucible and heated to 1400 ° C. at a heating rate of 150 ° C./h in an electric furnace. The melted cullet was quenched in water, dried, and sieved to 0.075 to 2.0 mm to obtain test sand for sand drift investigation as shown in Reference Photo 1. The true specific gravity of the obtained test sand was 2.71, and as shown in Reference Photo 2, it was easy to distinguish it from sea sand with the naked eye.
[0022]
[Example 2]
100 parts of panel glass cullet and 0.2 parts of cobalt oxide powder collected from the cathode ray tube were weighed in a crucible, melted at 1400 ° C. for 1 hour in an electric furnace, and then rapidly cooled in water to obtain a blue cullet. After drying this cullet, it was sieved to 0.075 to 2.0 mm to obtain the test sand for sand drift investigation similar to Reference Photo 1 of Example 1. The true specific gravity of the obtained test sand was 2.70, and as in Reference Photo 2 of Example 1, it was easy to distinguish it from sea sand with the naked eye.
[0023]
[Example 3]
Cobalt oxide 0.2 part and zinc oxide 20 part were added to 100 parts of colorless cullet of waste glass, and weighed in a crucible, and the test sand for sand drift investigation was obtained in the same manner as in Example 1. The true specific gravity of the obtained test sand was 2.72, and as in Reference Photo 2 of Example 1, it was easy to distinguish it from sea sand with the naked eye.
[0024]
[Comparative example]
100 parts of colorless cullet of waste glass and 0.2 part of cobalt oxide powder were weighed in a crucible, and test sand for sand drift investigation was obtained in the same manner as in Example 1. The obtained test sand was easy to distinguish from sea sand, but the true specific gravity was 2.50. The condition as test sand was not satisfied.
[0025]
【The invention's effect】
As described in detail above, the present invention obtains test sand for marine drift sand investigation that uses a waste glass and a metal compound, which is simple in the manufacturing process that could not be performed by the conventional method and easy to identify during analysis. Became possible.

Claims (2)

  Test sand for marine drift sand investigation, which is adjusted by using melted and pulverized CRT and liquid crystal waste glass used as monitors for TVs and computers, and adjusting the particle size and specific gravity to be the same as the seabed sand.   Test sand for marine drift sand investigation, wherein the specific gravity of the waste glass of claim 1 is in the range of 2.7 to 2.8.