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Treatment method of arsenic slag

A treatment method and technology for arsenic slag, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of increasing disposal links, affecting the stability of curing/stabilizing chemical conditions, and low arsenic oxidation efficiency, etc. problem, to achieve the effect of maintaining stability and reducing the concentration of leaching toxicity

Active Publication Date: 2019-11-26
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method not only directly increases the disposal process, but also has problems such as low arsenic oxidation efficiency in arsenic slag, incompatibility between oxidant products and curing agents, and affecting the stability of curing / stabilizing conditions.

Method used

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  • Treatment method of arsenic slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Effects of the mass ratio of tuff powder and arsenic slag powder on the arsenic solidification rate and uniaxial compressive strength of arsenic slag gel solidified body

[0019] like figure 1 As shown, the arsenic slag was dried, ground, and passed through a 200-mesh sieve to obtain arsenic slag powder. According to the mass ratio of 5:3:100, calcium oxide, sodium hydroxide, and tuff powder were weighed respectively; according to the mass ratio of 0.5:1, 0.7:1, 0.9:1, 1:1, 1.5:1, 2:1, 2.1:1, 2.3:1, 2.5:1 respectively weigh tuff powder and arsenic slag powder, mix and stir evenly to get arsenic mixed powder ; According to mass ratio 5:5:100, take iron oxide powder, aluminum powder, arsenic mixed powder respectively, mix, stir uniformly, obtain iron-arsenic mixed powder; According to liquid-solid ratio 55:100 (mL:mg), water and Mix the iron-arsenic mixed powder and stir evenly to obtain the iron-arsenic mixed slurry; perform low-temperature plasma irradiation on the iro...

Embodiment 2

[0028] Effect of mass ratio of iron oxide powder, aluminum powder and arsenic mixed powder on arsenic solidification rate and uniaxial compressive strength of arsenic slag gelled solidified body

[0029] Dry and grind the arsenic slag, pass through a 300-mesh sieve to obtain arsenic slag powder, weigh calcium oxide, sodium hydroxide, and tuff powder respectively according to the mass ratio of 7.5:4.5:100; weigh the tuff powder according to the mass ratio of 2:1 powder and arsenic slag powder, mix and stir evenly to obtain arsenic mixed powder; according to mass ratio 2.5:2.5:100, 3.5:3.5:100, 4.5:4.5:100, 5:2.5:100, 5:3.5:100, 5 :4.5:100, 2.5:5:100, 3.5:5:100, 4.5:5:100, 5:5:100, 5:7.5:100, 5:10:100, 7.5:5:100, 7.5:7.5 :100, 7.5:10:100, 10:5:100, 10:7.5:100, 10:10:100, 10:10.5:100, 10:11.5:100, 10:12.5:100, 10.5:10:100 , 11.5:10:100, 12.5:10:100, 10.5:10.5:100, 11.5:11.5:100, 12.5:12.5:100, respectively weigh iron oxide powder, aluminum powder, arsenic mixed powder, mix, stir...

Embodiment 3

[0035] Effects of mass ratio of calcium oxide, sodium hydroxide, and tuff powder on arsenic solidification rate and uniaxial compressive strength of arsenic slag gel solidification

[0036] Dry and grind the arsenic slag, pass through a 300-mesh sieve to obtain arsenic slag powder, according to the mass ratio of 2.5:1.5:100, 3.5:2:100, 4.5:2.5:100, 2.5:3:100, 3.5:3:100 , 4.5:3:100, 5:1.5:100, 5:2:100, 5:2.5:100, 5:3:100, 5:4.5:100, 5:6:100, 7.5:3:100, 7.5 :4.5:100, 7.5:6:100, 10:3:100, 10:4.5:100, 10:6:100, 10.5:6:100, 11.5:6:100, 12.5:6:100, 10:6.5 :100, 10:7:100, 10:7.5:100, 10.5:6.5:100, 11.5:7:100, 12.5:7.5:100, weigh calcium oxide, sodium hydroxide, tuff powder respectively; 1. Weigh tuff powder and arsenic slag powder respectively, mix and stir evenly to obtain arsenic mixed powder. According to the mass ratio of 10:10:100, weigh iron oxide powder, aluminum powder, and arsenic mixed powder respectively, mix and stir evenly to obtain iron-arsenic mixed powder; The arse...

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Abstract

The invention discloses a treatment method of arsenic slag. The method includes: mixing mixing tuff powder with arsenic slag powder uniformly to obtain arsenic mixed powder; then mixing mixing iron oxide powder, aluminum powder and arsenic slag powder uniformly to obtain iron-arsenic mixed powder; adding water into the iron-arsenic mixed powder, and stirring the substances uniformly to obtain an iron-arsenic mixed slurry; carrying out stirring and aeration treatment while subjecting the iron-arsenic mixed slurry to low-temperature plasma irradiation to obtain a plasma treated slurry; and adding calcium oxide and sodium hydroxide into the plasma treated slurry, stirring the substances uniformly, putting the mixture into a mold, and conducting curing and demolding to obtain the arsenic slaggelatinized solidified body. The method provided by the invention integrates oxidation detoxification and solidification stabilization of arsenic slag, and efficiently stabilizes a low-toxicity pentavalent arsenic salt in the gelatinized solidified body; the added ferric ions can efficiently adsorb reducing substances, avoid reduction of pentavalent arsenic into trivalent arsenic again, and maintain the stability of pentavalent arsenic; the strength of the arsenic slag solidified body can reach 51.62MPa maximumly, and the arsenic leaching concentration is lower than the allowable arsenic concentration value of domestic drinking water (first grade).

Description

technical field [0001] The invention relates to a treatment method for arsenic slag, in particular to a treatment method for strengthening detoxification and gelling, solidification and stabilization of arsenic slag. Background technique [0002] A large amount of arsenic slag is produced in the process of mining, beneficiation and smelting of arsenic-containing non-ferrous metal ores. The arsenic slag usually exists in the form of arsenic-iron slag, arsenic sulfide slag, arsenic-calcium slag and organic arsenic slag. A variety of arsenic compounds contained in arsenic slag are toxic to the human body, can cause damage to human organs, and can easily induce human tissue canceration; arsenic pollutants released by arsenic slag in the soil can also inhibit the growth of plant roots, causing plants to wither and die , seriously affecting the ecological balance. [0003] At present, the disposal methods for arsenic slag mainly include leaching and leaching methods, electrodynam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/14C04B40/00
CPCC04B28/006C04B18/144C04B40/0017C04B40/0028C04B2201/50C04B22/064C04B22/062C04B14/14C04B14/308C04B22/04C04B22/002Y02W30/91
Inventor 黄涛宋东平张树文周璐璐陶骏骏徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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