Arsenic sulfide slag wet mineralization detoxification treatment method

A treatment method, arsenic sulfide technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of complex types of agents, harsh process conditions, long treatment cycle, etc., to improve the efficiency of mineral conversion , high oxidation efficiency and low treatment cost

Active Publication Date: 2022-03-11
CHANGSHA SCI ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] "Stabilization / solidification treatment of arsenic sulfide slag and its effect evaluation" reported that lime, cement, combined with oxidant, polyferric sulfate, and polyacrylamide were used to prepare a solidified body to treat arsenic sulfide slag. The stabilization effect of this method reached GB 18598-2001 Requirements, but there are many kinds of agents, and the cured body needs to be cured for 28 days, which is a long period;
[0006] CN109500059A discloses a method for transforming arsenic sulfide slag and solidifying and stabilizing microcapsules, but the process is complicated, the process conditions are harsh, and the treatment cycle is long;
[0007] CN108580513A discloses a hot-pressing sintering solidification method for arsenic sulfide slag, which requires a temperature of about 150°C and a mechanical pressure of about 10 MPa, which can reduce the dissolution of arsenic to a certain extent, but is prone to secondary pollution, which is not conducive to industrial applications;
[0008] CN105967232A discloses a method for leaching and synchronously stabilizing arsenic sulfide slag by using thermophilic iron-oxidizing microorganisms. The process conditions are strict and have not reached the standard limit in GB 18598-2001, so safe landfill disposal cannot be performed;
[0009] CN106823238A discloses a hydrothermally stable solidification treatment method for arsenic sulfide slag. The stabilization effect of this method meets the requirements of GB 18598-2001, but its industrial application is limited due to the need for pressure and hydrothermal conditions;
[0010] CN105499250A discloses a method for stabilizing sulfurized arsenic-removing slag. This method uses calcium carbide slag, cement clinker, copper slag, furnace slag, and chloride salt as additives to prepare a solidified body, which fails to meet the standard limit of GB 18598-2001 stably , and the types of agents are complex and the processing cycle is long;
[0011] CN104174634A discloses a stable solidification method for strongly acidic arsenic sulfide waste residue. The method uses heavy metal sludge, lime, cement, and yellow sand to prepare a solidified body. Although the arsenic leaching toxicity after treatment reaches the standard limit of GB 18598-2001, the pH exceeds Limit value, safe landfill disposal is still not possible, and the capacity increase ratio is large

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  • Arsenic sulfide slag wet mineralization detoxification treatment method
  • Arsenic sulfide slag wet mineralization detoxification treatment method
  • Arsenic sulfide slag wet mineralization detoxification treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Preparation of composite oxidant:

[0041] Choose hydrogen peroxide with a mass concentration of 30% as an oxidant, and choose concentrated sulfuric acid with a mass concentration of 98% as an acid regulator. Weigh 40g of hydrogen peroxide, 1.2g of concentrated sulfuric acid, and 18.8g of pure water, and mix the three to make a composite oxidant, wherein the mass concentration of hydrogen peroxide is 20%, and the mass concentration of sulfuric acid is 2%.

[0042] Preparation of mineralizer:

[0043] Use magnesite as the magnesium source of the main ingredient A, the magnesium content is 25wt%, the crushed magnesite particle size is 3mm, the calcination temperature is 800°C, the holding time is 2h, the furnace is cooled to 300°C, taken out, and ground to 200 mesh Sieve, take the sieve to obtain the main ingredient A; kaolin is used as the aluminum source of the auxiliary ingredient B, the aluminum content is 21wt%, the crushing particle size is 3mm, the drying temperat...

Embodiment 2

[0055] Preparation of composite oxidant:

[0056] Choose hydrogen peroxide with a mass concentration of 30% as an oxidant, and choose concentrated sulfuric acid with a mass concentration of 98% as an acid regulator. Weigh 30g of hydrogen peroxide, 1.8g of concentrated sulfuric acid, and 28.2g of pure water, and mix the three to make a composite oxidant, wherein the mass concentration of hydrogen peroxide is 15%, and the mass concentration of sulfuric acid is 3%.

[0057] Preparation of mineralizer:

[0058] Use magnesite as the magnesium source of the main ingredient A, the magnesium content is 25wt%, the crushed magnesite particle size is 6mm, the calcination temperature is 825°C, the holding time is 3h, the furnace is cooled to 300°C, taken out, and ground to 200 mesh Sieve, take the sieve to obtain the main ingredient A; kaolin is used as the aluminum source of the auxiliary ingredient B, the aluminum content is 21wt%, the crushing particle size is 6mm, the drying temperat...

Embodiment 3

[0071] Preparation of composite oxidant:

[0072] Choose hydrogen peroxide with a mass concentration of 30% as an oxidant, and choose concentrated sulfuric acid with a mass concentration of 98% as an acid regulator. Weigh 20g of hydrogen peroxide, 3.0g of concentrated sulfuric acid, and 37g of pure water, and mix the three to make a composite oxidant, wherein the mass concentration of hydrogen peroxide is 10%, and the mass concentration of sulfuric acid is 5%.

[0073] Preparation of mineralizer:

[0074] Use magnesite as the magnesium source of the main ingredient A, the magnesium content is 25wt%, the crushed magnesite particle size is 9mm, the calcination temperature is 850°C, the holding time is 4h, the furnace is cooled to 300°C, taken out, and ground to 200 mesh Sieve, take the sieve to obtain the main ingredient A; kaolin is used as the aluminum source of the auxiliary ingredient B, the aluminum content is 21wt%, the crushing particle size is 9mm, the drying temperatur...

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Abstract

The invention discloses an arsenic sulfide slag wet mineralization detoxification treatment method which comprises the following steps: adding arsenic sulfide slag into water to obtain an arsenic-containing slurry, adding a composite oxidant under stirring, carrying out a first reaction, adding a mineralizer under stirring, carrying out a second reaction, and maintaining the detoxified slag obtained after the reaction to obtain mineralized slag. According to the method, the arsenic in the arsenic sulfide slag is subjected to effective high-valence conversion through the composite oxidizing agent and then reacts with the mineralizing agent to generate the arsenic-containing mineral with the low solubility product, and the free and non-obligate adsorption form arsenic in the arsenic sulfide slag is converted into a composite mineral form capable of stably existing for a long time through the strong coordination adsorption effect; therefore, efficient detoxification of the arsenic sulfide slag is realized. The method is simple in process, short in period, stable in effect, small in capacity increasing ratio and low in treatment cost, after the arsenic sulfide slag is subjected to mineralization detoxification treatment, all indexes can reach the middle limit value of the hazardous waste landfill pollution control standard, and safe landfill treatment can be carried out.

Description

technical field [0001] The invention belongs to the field of stabilization treatment of arsenic-containing waste residues, and in particular relates to a wet mineralization and detoxification treatment method for arsenic sulfide residues. Background technique [0002] Arsenic sulfide slag is mainly slag cake produced by sulfidation and pressure filtration of dirty acid after purification of smelting flue gas in the non-ferrous smelting industry, and part of it is slag cake produced by sulfidation and impurity removal of phosphoric acid liquid in the chemical industry and pressure filtration, also known as arsenic filter cake. Generally between 50-60%, the arsenic content is about 10-25%, the appearance is yellow or yellow-brown, with strong acid corrosion and reduction, and it is gradually oxidized in the air to cause arsenic to dissolve, and the toxicity of arsenic leaching is 5-5. Between 10000mg / L. Compared with other arsenic-containing waste residues, arsenic sulfide re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/70B09B3/38B09B101/00
CPCB09B3/00Y02W30/91
Inventor 蒋国民闫国孟王克勇闫虎祥刘永丰徐文皓贺清华董芬赵淑宏高伟荣
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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