A kind of processing method of arsenic slag

A treatment method and technology of arsenic slag, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of increasing disposal links, affecting the stability of curing/stabilizing conditions, and the inconsistency between oxidant products and curing agents Compatibility and other issues to achieve the effect of maintaining stability and reducing the concentration of leaching toxicity

Active Publication Date: 2022-03-29
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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  • A kind of processing method of arsenic slag
  • A kind of processing method of arsenic slag
  • A kind of processing 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] Such as 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 ...

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 method for treating arsenic slag, which comprises mixing tuff powder and arsenic slag powder to obtain mixed arsenic powder; then mixing iron oxide powder, aluminum powder and arsenic slag powder to obtain iron-arsenic mixed powder; Add water and stir the mixed powder to obtain iron-arsenic mixed slurry; irradiate the iron-arsenic mixed slurry with low-temperature plasma while stirring and aeration treatment to obtain plasma-treated slurry; add calcium oxide and sodium hydroxide to the plasma The slurry is processed, stirred evenly, molded, cured, demoulded, and the arsenic slag is gelled and solidified. The present invention integrates the oxidation and detoxification of arsenic slag and the solidification and stabilization of arsenic slag, and the low-toxicity pentavalent arsenic salt is efficiently stabilized in the gelled solidified body; the addition of ferric ions can efficiently adsorb reducing substances, avoiding Pentavalent arsenic is reduced to trivalent arsenic again to maintain the stability of pentavalent arsenic; the solidified body of arsenic slag can reach a maximum strength of 51.62MPa, and the arsenic leaching concentration is lower than the allowable value of arsenic concentration in drinking water (grade 1).

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 Patents(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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