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

Inactive Publication Date: 2021-04-23
一点清(北京)环境治理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste residue separated from arsenic is generally landfilled, but the waste residue contains metal copper, lead and a small amount of metal arsenic. These substances are extremely difficult to degrade and accumulate in the soil, which is likely to cause soil pollution and is not conducive to the real recycling of arsenic-containing waste.
At the same time, the silicon and calcium substances in the waste residue after arsenic recovery have not been well utilized. Therefore, it is necessary to design a new recovery process for arsenic-containing waste to further increase its recovery value.

Method used

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  • Process for treating waste containing arsenic, method for preparing inorganic fiber and method for recovering arsenic
  • Process for treating waste containing arsenic, method for preparing inorganic fiber and method for recovering arsenic
  • Process for treating waste containing arsenic, method for preparing inorganic fiber and method for recovering arsenic

Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention relates to the field of waste treatment, in particular to a treatment process for waste containing arsenic, a method for preparing inorganic fibers and a method for recovering arsenic. The process for treating arsenic-containing waste includes the following steps: mixing the arsenic-containing waste with inorganic raw materials to obtain a first mixture, and the mass of calcium compounds and silicon compounds accounts for 60-80% of the mass of the first mixture. The first mixture is heated under the condition of 1300-1700° C., and the inorganic arsenic is recovered from the heated steam. Inorganic fibers are prepared by using the residue obtained after heating. It can not only recycle arsenic, but also use the leftover material after arsenic recovery to prepare fibers, which further improves the utilization rate of waste materials and reduces production costs as a whole.

Description

technical field [0001] The invention relates to the field of waste treatment, in particular to a treatment process for waste containing arsenic, a method for preparing inorganic fibers and a method for recovering arsenic. Background technique [0002] In addition to arsenic and its compounds, arsenic-containing waste generally includes silicon, calcium, magnesium oxide and other substances. At present, there are two methods for treating arsenic-containing waste at home and abroad: one is oxidation roasting and reduction roasting. The arsenic is directly recovered in the form of white arsenic through fire methods such as vacuum roasting; the other is to use wet processes such as acid leaching, alkali leaching or salt leaching to separate arsenic from the slag first. Then it is further treated by vulcanization method or other harmless treatment. The waste slag separated from arsenic is generally landfilled, but the waste slag contains metal copper, lead and a small amount of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C22B7/00C22B30/04
CPCC22B7/001C22B30/04D01F9/08Y02P10/20Y02P70/62
Inventor 刘缙李小卫夏澍李科李殿杰闫秀成
Owner 一点清(北京)环境治理有限公司
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