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Treatment method of arsenic slag

An arsenic slag and mixture technology, which is applied in the field of arsenic slag treatment, can solve the problems of secondary pollutants, long treatment time, complicated treatment technology, etc., and achieves the effects of high mechanical strength, low leaching toxicity, and strong operability.

Inactive Publication Date: 2011-10-19
杭州大地环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment technology is complicated, the treatment time is long, and secondary pollutants will be generated during the treatment process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take a certain amount of arsenic slag, add fly ash 4 times the mass of arsenic slag and a certain amount of water, and stir for 0.25h. Then, add 10% iron filings and 30% calcium carbonate by mass of arsenic slag, and stir for 0.25h. Finally, add No. 42.5 ordinary Portland cement twice the mass of arsenic slag, and stir for 0.5h. Cover the well-stirred mixture with a tarpaulin, let it stand at room temperature for 3 days, and then do the leaching toxicity test. The test results showed that the leaching toxicity of arsenic was reduced from the original 361mg / L to 0.53mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

Embodiment 2

[0030] Take a certain amount of arsenic slag, add fly ash 6 times the mass of arsenic slag and a certain amount of water, and stir for 0.25h. Then, 10% of iron red, 5% of ferrous sulfate and 10% of magnesia by mass of arsenic slag were added, and stirred for 0.5h. Finally, No. 42.5 ordinary Portland cement with 1.5 times the mass of arsenic slag and 50% steel slag powder were added, and stirred for 0.5 h. Cover the well-stirred mixture with a tarpaulin, let it stand at room temperature for 3 days, and then do the leaching toxicity test. The test results showed that the leaching toxicity of arsenic was reduced from the original 361mg / L to 0.85mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

Embodiment 3

[0032] Take a certain amount of arsenic slag, add fly ash 8 times the mass of arsenic slag and a certain amount of water, and stir for 0.25h. Then, 5% iron powder, 5% ferrous sulfate and 20% calcium carbonate were added by the mass of arsenic slag, and stirred for 0.5h. Finally, add No. 42.5 ordinary Portland cement twice the mass of arsenic slag and steel slag powder twice the mass, and stir for 0.5 h. Cover the well-stirred mixture with a tarpaulin, let it stand at room temperature for 3 days, and then do the leaching toxicity test. The test results showed that the leaching toxicity of arsenic was reduced from the original 361mg / L to 0.35mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

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Abstract

The invention discloses a treatment method of arsenic slag. The method is characterized by comprises the following steps: (1) adding fly ash and water in the arsenic slag, and stirring for 0.25-1 hour; (2) adding a stabilizing agent in the mixture obtained from the step (2), and stirring for 0.25-1 hour; (3) adding a curing agent in the mixture obtained from the step (3), and stirring for 0.25-1 hour; and (4) curing the mixture obtained from the step (3) for 1-7 days. According to the invention, the leaching toxity of the arsenic slag can be reduced to the admission requirement of a dangerous and waste landfill site, also the fly ash can be treated to achieve the aim of treating waste by the use of waste; and the method provided by the invention has simple process, the material is easy to obtain, the treatment cost is low, and the method has a favorable application prospect.

Description

technical field [0001] The invention relates to a treatment method for arsenic slag. Background technique [0002] Arsenic and its compounds seriously endanger human health, and have been identified as Class 1 carcinogens by the US Centers for Disease Control and International Agency for Cancer Research. They mainly endanger human health through drinking water. In recent years, with the vigorous development of mineral resources and inadequate environmental protection supervision, serious arsenic poisoning incidents have occurred in many areas of the country, which has aroused special attention from governments at all levels. [0003] In the chemical industry and metallurgical production process, the solution dearsenic treatment often adopts the sulfide precipitation method, thus producing arsenic slag with high arsenic content. For a long time, most arsenic-containing wastes have been treated by hoarding and storage. As time goes by, high-concentration arsenic-containing wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 张文辉吴竞宇马力
Owner 杭州大地环保有限公司
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