Method for synchronously solidifying and stabilizing arsenic sulfide residues and recycling sulfur resources

A technology for resource recovery and arsenic sulfide, applied in chemical instruments and methods, preparation/purification of aluminum-sulfur compounds, sulfur, etc., can solve problems such as poor long-term stability

Active Publication Date: 2019-11-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toxicity leaching test of scorodite shows that scorodite is relatively stable in the short term, but its long-term stability is not good, and it can only maintain a stable state under acidic conditions. In a near-neutral or alkaline environment, scorodite have varying degrees of dissolution

Method used

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  • Method for synchronously solidifying and stabilizing arsenic sulfide residues and recycling sulfur resources
  • Method for synchronously solidifying and stabilizing arsenic sulfide residues and recycling sulfur resources
  • Method for synchronously solidifying and stabilizing arsenic sulfide residues and recycling sulfur resources

Examples

Experimental program
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Effect test

Embodiment example 1

[0028] Take 0.1g of slag containing simulated arsenic sulfide in the reactor, add hydrogen peroxide containing 10%, aluminum sulfate, sodium sulfate concentration is respectively 0.08mol / L, the mixed solution of 0.08mol / L, make solid-liquid ratio be 1: 150g / ml, adjust pH=2, stir evenly, put the reaction kettle at 200°C for 2h, and cool down to room temperature naturally. Through cleaning and flotation, yellow agglomerated sulfur and sodium arsenic alunite solids are finally separated, the recovery rate of sulfur reaches 90%, and its purity exceeds 95%; the mass fraction of its arsenic is 2.85%, and the volume of waste residue is reduced by 60%; The toxic leaching of arsenic is 0.1mg / L.

Embodiment example 2

[0030]The arsenic sulfide sludge, a product of acid wastewater treatment in a smelter in Fujian Province, was taken as the research object. The mass analysis of all elements shows that the main elements in the arsenic slag are As 53.4%, S 42%, Na 1.5%, Ni 1.3%, and Cu 0.98%. Take 0.1g of arsenic-containing waste slag in the reaction kettle and add 10% hydrogen peroxide , the concentrations of aluminum sulfate and sodium sulfate are 0.08mol / L and 0.08mol / L respectively, so that the solid-liquid ratio is 1:150g / ml, adjust the pH=2, stir evenly, and put the reaction kettle at 200°C Reaction 2h, naturally cooled to room temperature. Through cleaning and flotation, yellow agglomerated sulfur and arsenic sodium alunite solids are finally separated, the recovery rate of sulfur reaches 90%, and its purity exceeds 95%; the mass fraction of its arsenic is 2.38%, and the volume of waste residue is reduced by 60%; The toxic leaching of arsenic is 0.16mg / L.

Embodiment example 3

[0032] The arsenic sulfide slag produced after sulfidation and precipitation of polluted acid wastewater from a non-ferrous metal smelter in Henan Province was taken as the research object. The mass analysis of all elements shows that the main elements in the arsenic slag are As 11.35%, S 37.96%, O 26.09%, Cu 23.53%, and Al 1.07%. Take 0.2g of arsenic-containing waste slag in the reactor and add 10% peroxide The concentration of hydrogen, aluminum sulfate, and sodium sulfate is 0.08mol / L, 0.08mol / L mixed solution, so that the solid-liquid ratio is 1:80g / ml, adjust pH = 2, after stirring evenly, put the reaction kettle at 200°C Under the reaction 2h, naturally cooled to room temperature. Through cleaning and flotation, yellow agglomerated sulfur and sodium arsenic alunite solids are finally separated, the recovery rate of sulfur reaches 90%, and its purity exceeds 96%; the mass fraction of its arsenic is 5.64%, and the volume of waste residue is reduced by 60%; The toxic leach...

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Abstract

The invention discloses a method for synchronously solidifying and stabilizing arsenic sulfide residues and recycling sulfur resources. A hydrothermal method is mainly adopted, by introducing a mineralizer aluminum sulfate, the sulfide residues are transformed into arsenic sodium alum stone, the transformation condition is optimized, and the long-term stability of the arsenic sodium alum stone isevaluated. Natroalunite is an extremely stable mineral, the chemical formula is usually NaAl3(SO4)2(OH)6, an arsenic sodium alum stone solid solution (NaAl3(SO4)[2-x](AsO4)x(OH)6) is formed through isomorphism substitution between arsenate (AsO4<3->) and sulfate radical (SO4<2->) in the natroalunite structure, and solidification and stabilization of arsenic are achieved. Experimental results showthat x in the arsenic sodium alum stone solid solution can reach 0.154, the mass fraction of arsenic is 2.85%, the volume reduction of waste residues reaches 60% or above, the recovery rate of sulfurreaches 90% or above, and the purity exceeds 95%. The arsenic leaching toxicity of the arsenic sodium alum solid solution is evaluated, the results show that the leaching concentration of arsenic is 0.1-0.5 mg / L, the requirements of hazardous waste stockpiling are met, and it is indicated that the technology is economical and effective on stabilizing treatment of the arsenic residues.

Description

technical field [0001] The invention belongs to the field of solidification and stabilization treatment of arsenic waste residue and recycling of sulfur. Background technique [0002] A large amount of high-concentration arsenic-containing waste liquid is produced in the non-ferrous metal smelting process in my country. The precipitation process is mainly used for this high-concentration arsenic-containing waste acid. This process is simple and has good treatment effect, so it is widely used. However, a large amount of arsenic-containing waste residues produced in the process are highly toxic substances, including arsenic sulfide residues, the molecular formula As 2 S 3 , composition As 60.9%, S 39.1%, natural product called orpiment, yellow or orange solid. The item is highly toxic and carcinogenic. Soluble in alkali metal hydroxides, carbonates, oxidized to arsenic acid with peroxide and concentrated nitric acid and dissolved. The solubility in pure water is 1.81mol / L,...

Claims

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Application Information

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IPC IPC(8): C01B17/06C01F7/76B09B3/00
CPCC01B17/06C01F7/762B09B3/00C01P2002/72C01P2004/03C01P2006/80B09B3/40
Inventor 张静李明洋刘峰
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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