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A treatment method for stabilizing/solidifying arsenic sulfide slag based on friedel salt

A treatment method, arsenic sulfide technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problem of leaching toxicity reduction

Active Publication Date: 2022-08-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the existing arsenic sulfide slag treatment, the object of the present invention is to provide a Friedel salt-based strong acidic arsenic sulfide slag that is simple to operate, low in cost, small in volume ratio, and waste-to-waste. The treatment method of arsenic slag uses waste incineration fly ash as the main matrix, and replaces traditional cement with aluminate cement rich in active aluminum as a component regulator, thereby forming a large amount of Friedel salt in the solidified matrix to stabilize arsenic sulfide slag / curing treatment, the leaching toxicity of arsenic in the cured body is greatly reduced to below 5mg / L, and the compressive strength reaches above 10MPa

Method used

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  • A treatment method for stabilizing/solidifying arsenic sulfide slag based on friedel salt
  • A treatment method for stabilizing/solidifying arsenic sulfide slag based on friedel salt
  • A treatment method for stabilizing/solidifying arsenic sulfide slag based on friedel salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the arsenic sulfide slag produced by the sulfidation of foul acid hydrogen sulfide in a copper smelter. The slag has a moisture content of 75% and a leaching toxicity of 3181.5 mg / L. The analysis results of the main elements of the arsenic sulfide slag are shown in Table 1.

[0024] Table 1 Main elements of arsenic sulfide slag (%)

[0025]

[0026] The arsenic sulfide slag was vacuum dried at 60°C to reduce the moisture content to less than 5%. Weigh 21.6g of waste incineration fly ash and 5.4g of aluminate cement according to the mass ratio of 8:2, and weigh 3g of dried arsenic sulfide slag at the same time, and mix the waste incineration fly ash, aluminate cement and arsenic sulfide slag evenly Standby (the total mass of the mixture is 30 g). Mix water glass with a modulus of 3.3 (the mass percentage of water content is 66%) and NaOH with a concentration of 96% to obtain an alkali activator with a modulus of 1.5, take 5ml of the alkali activator and 6.5ml o...

Embodiment 2

[0030]Take the arsenic sulfide slag produced by the sulfidation treatment of polluted acid sodium sulfide in a lead-zinc smelter. The slag has a moisture content of 52% and a leaching toxicity of 2903.1 mg / L. The analysis results of the main elements of the arsenic sulfide slag are shown in Table 3.

[0031] Table 3 Main elements of arsenic sulfide slag (%)

[0032]

[0033] The arsenic sulfide slag was vacuum dried at 60°C to reduce the moisture content to less than 5%. Weigh 22.95g of fly ash and 2.55g of aluminate cement according to the mass ratio of 9:1, and weigh 4.5g of arsenic sulfide slag at the same time, and mix the fly ash, aluminate cement, and arsenic sulfide slag evenly for use (the total mass of the mixture is 30g). Mix water glass with a modulus of 3.3 (the mass percentage of water content is 66%) and NaOH with a concentration of 96% to obtain an alkali activator with a modulus of 1.0. Take 5ml of the alkali activator and 6.5ml of distilled water, mix and ...

Embodiment 3

[0035] Take the arsenic sulfide slag produced by the sulfidation of foul acid hydrogen sulfide in a copper smelter. The slag has a moisture content of 70% and a leaching toxicity of 2832.4 mg / L. The analysis results of the main elements of the arsenic sulfide slag are shown in Table 4.

[0036] Table 4 Main elements of arsenic sulfide slag (%)

[0037]

[0038] The arsenic sulfide slag was vacuum dried at 60°C to reduce the moisture content to less than 5%. Weigh 21.6g of waste incineration fly ash and 5.4g of aluminate cement at a mass ratio of 8:2, and weigh 3g of arsenic sulfide slag at the same time, and mix the fly ash, aluminate cement, and arsenic sulfide slag evenly for use (the total mass of the mixture). 30g). Mix water glass with a modulus of 3.3 (water content mass percentage of 66%) and NaOH with a concentration of 96% to obtain an alkali activator with a modulus of 1.5. Take 5ml of the alkali activator and 6.5ml of distilled water, mix and shake well , slow...

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Abstract

The invention discloses a treatment method based on Friedel salt stabilization / solidification of arsenic sulfide slag. The waste incineration fly ash, aluminate cement and arsenic sulfide slag are mixed uniformly to obtain a mixture, an alkali activator is added to the mixture, and the mixture is uniformly stirred and then cured. An arsenic-containing solidified body was obtained. The present invention utilizes waste incineration fly ash as the main matrix, and replaces traditional cement with active aluminum-rich aluminate cement as the component regulator, so that a large amount of Friedel salt is formed in the solidified matrix to stabilize / solidify the arsenic sulfide slag, The leaching toxicity of arsenic in the solidified body is greatly reduced to below 5mg / L, and the compressive strength is above 10MPa.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of solid hazardous waste, and relates to a treatment method for stabilizing / solidifying arsenic sulfide slag based on Friedel salt. Background technique [0002] my country's non-ferrous metal industry produces a large amount of high-arsenic polluted acid and high-arsenic electrolytic waste every year. At present, most of the arsenic-containing acidic wastewater is treated with vulcanizing agents such as hydrogen sulfide, phosphorus sulfide, and sodium sulfide for sulfide precipitation. The yellow arsenic sulfide slag produced has high moisture content, large storage space, strong acidity, and high arsenic content in the slag. Long-term contact with air will also oxidize into arsenic oxide, causing serious secondary pollution to the environment. Therefore, the pollution control and safe disposal of arsenic sulfide slag is a major demand of the non-ferrous industry. [0003] Stabilizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/27
CPCB09B3/25
Inventor 柯勇闵小波许秋婧王静雯姜光华吴理觉付海阔姚理为梁彦杰李童冰
Owner CENT SOUTH UNIV
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