Insolubilization material and insolubilization method for arsenic
A technology of gypsum and mass parts, which is applied in the direction of chemical instruments and methods, soil conditioning materials, organic fertilizers, etc., can solve the problems of relatively large restrictions, high cost, soil loss and land use, and achieve the effect of reducing the amount of arsenic dissolved
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[0086] Hereinafter, examples and comparative examples are given, and the present invention will be described more concretely. First, the test method and evaluation method used will be described. Each test used for examining the effect etc. was performed by the following method.
[0087] [Each test method used]
[0088] (1) Announcement No. 18 of the Ministry of the Environment in 2003 Dissolution test method
[0089] The soil to be tested was dried and passed through a 2 mm sieve, and water was added as a solvent in an amount 10 times the amount of the passed dried soil to prepare a test sample. This was continuously vibrated and mixed under the conditions of 6 hours, 200 times / minute, and an amplitude of 4 to 5 cm. Then, the filtrate obtained after centrifugation and filtration was used as a sample for measurement. The analysis of arsenic in this sample was performed by a method according to various analysis methods of arsenic standardized by JIS.
[0090] (2) pH test
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Embodiment A1～7
[0114] In Example A1, 100 parts by mass of hemihydrate gypsum used in Comparative Example A2 as gypsum and 6 parts by mass of commercially available water-atomized iron powder (average particle diameter: 70 μm) as iron powder were used. Insoluble material. The insoluble material so that every 1m 3 The test was carried out by adding 15 kg of hemihydrate gypsum and 0.9 kg of water atomized iron powder to the simulated contaminated soil.
[0115] In Examples A2 to 7, except that the content and the addition amount of the water atomized iron powder in the insolubilization material were changed as shown in Table 1, the test was performed in the same manner as in Example A1.
[0116] (Comparative Examples A3-4 and Reference Example A9)
[0117] In Comparative Examples A3-4 and Reference Example A9, the water atomized iron powder used in Example A3 was changed to commercially available iron oxide, commercially available ferrous oxide, and commercially available Iron hydroxide was ...
Embodiment B1～3
[0121] In Examples B1-3, the insolubilization material which further mixed 10 mass parts, 20 mass parts, and 30 mass parts of aluminum sulfates to the insolubilization material used in Example A2 was used. As the aluminum sulfate, commercially available aluminum sulfate 18 hydrate was used. In addition, the amount of aluminum sulfate added accordingly per 1m 3 1.5kg, 3kg, and 4.5kg in the above-mentioned simulated polluted soil. Thus, in Examples B1 to 3, the test was performed in the same manner as in Example A2, except that the content of aluminum sulfate in the insoluble material and the addition amount to the above-mentioned simulated contaminated soil were changed.
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