A method for simultaneous solidification and stabilization of arsenic sulfide slag and sulfur resource recovery

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: 2021-04-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for simultaneous solidification and stabilization of arsenic sulfide slag and sulfur resource recovery
  • A method for simultaneous solidification and stabilization of arsenic sulfide slag and sulfur resource recovery
  • A method for simultaneous solidification and stabilization of arsenic sulfide slag and sulfur resource recovery

Examples

Experimental program
Comparison scheme
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 the pH=2, stir evenly, put the reaction kettle at 200°C for 2h, and let it 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 sewage 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 leachin...

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Abstract

This paper discloses a method for synchronously solidifying and stabilizing arsenic sulfide slag and sulfur resource recovery. This paper mainly uses the hydrothermal method to quickly convert arsenic slag into arsenic sodium alunite by introducing the mineralizer aluminum sulfate, and optimize the conversion conditions. Evaluation of the long-term stability of arsenite. Sodium alunite is a kind of extremely stable mineral, its chemical formula is generally NaAl 3 (SO 4 ) 2 (OH) 6 , using arsenate (AsO 4 3‑ ) and the sulfate group (SO 4 2‑ ) between isomorphic substitutions to form arsenosodium alunite solid solution (NaAl 3 (SO 4 ) 2‑x (AsO 4 ) x (OH) 6 ), so as to achieve the solidification and stabilization of arsenic. The experimental results show that x can reach 0.154 in arsenic sodium alunite solid solution, the mass fraction of arsenic is 2.85%, the volume reduction of waste residue is over 60%, the recovery rate of sulfur is over 90%, and its purity is over 95%. The arsenic leaching toxicity of arsenic sodium alunite solid solution was evaluated, and the results showed that the leaching concentration of arsenic was 0.1-0.5 mg / L, which met the requirements for storage of hazardous waste, and indicated that this technology was economical and effective for the stabilization of arsenic slag.

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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Patent Type & Authority Patents(China)
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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