Process for treating waste containing arsenic, method for preparing inorganic fiber and method for recovering arsenic
A treatment process and technology of inorganic fibers, applied in the field of waste treatment, can solve the problems that silicon-based substances and calcium-based substances are not used well, unfavorable for the recycling of arsenic-containing wastes, soil pollution, etc. Expanding the effect of recycling methods
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Embodiment 1
[0048] This embodiment provides a treatment process for arsenic-containing waste, comprising the following steps:
[0049] S1, heating and melting;
[0050] Mixing the arsenic-containing waste material with the inorganic raw material to obtain a first mixture, so that the mass of the calcium compound and the silicon compound in the first mixture accounts for 60-80% of the mass of the first mixture, that is, the content of calcium and silicon is 60-80%, The mass ratio of calcium and silicon in the first mixture is 1.2-1.7:1, that is, the ratio of calcium to silicon is 1.2-1.7:1. Wherein, the inorganic raw material may be high calcium stone, coal gangue and other substances.
[0051] Then the first mixture is heated at 1300-1700°C.
[0052] S2, recovery of arsenic;
[0053] Lower the temperature of the steam containing arsenic, usually to 400-500°C (that is, the first cooling), and then carry out high-temperature electrostatic dust removal.
[0054] Then, the temperature of ...
Embodiment 2-5
[0066] The operation of Embodiment 2-5 is basically the same as that of Embodiment 1, except that the operating conditions of Embodiment 2-5 are changed. Specifically, see Table 1 for the operating conditions.
[0067] The operating conditions of table 1 embodiment 2-5
[0068]
[0069] In addition, in Example 5, the limit is passed into the modification pool, and the amount of modifier added is 5-10% of the mass of the fiber to be modified. After modification, dehydration and drying are carried out.
experiment example
[0071] The recovery rate and purity of the arsenic prepared in Examples 1-5 of the present invention were detected, and the detection results are shown in Table 2.
[0072] Table 2 Arsenic detection results
[0073]
[0074] According to Table 2, it can be seen that the arsenic recovered by the method provided by the embodiment of the present invention has a high recovery rate and a high purity, indicating that the arsenic recovery benefit is high and greater economic benefits are generated.
[0075] The inorganic fibers prepared in Example 1 of the present invention were tested, and the test results are shown in Table 3.
[0076] Table 3 Inorganic fiber test results
[0077]
[0078] It can be seen from Table 3 that the fiber prepared by the embodiment of the present invention has a relatively high fireproof rating and good corrosion resistance, and can be used as an industrial fireproof material.
[0079] In summary, the present invention increases the content of cal...
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