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A kind of arsenic sulfide slag hydrothermally stable solidification treatment method

A solidification treatment and arsenic sulfide technology, which is applied in the field of environmental protection, can solve the problems of no arsenic sulfide slag artificially synthesized minerals, etc., and achieve the effect of wide range of pretreatment agents, small dosage, and low operating costs

Active Publication Date: 2020-02-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research on artificially synthesized minerals such as crystallization, microcrystallization, and amorphous solidification of arsenic sulfide slag.

Method used

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  • A kind of arsenic sulfide slag hydrothermally stable solidification treatment method
  • A kind of arsenic sulfide slag hydrothermally stable solidification treatment method
  • A kind of arsenic sulfide slag hydrothermally stable solidification treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The arsenic sulfide slag from a copper smelter produced by sulfuric acid hydrogen sulfide treatment in a copper smelter has a moisture content of 70%, and the mass analysis of all elements shows that it mainly contains 25.7% of arsenic, 30.5% of sulfur, 0.71% of Cu, 0.17% of iron, and 0.12% of antimony %, lead 0.005%, cadmium 0.006%. Take 100g of its slag, add 600mL of water, the pH is 1.2, add 0.5g of ferrous sulfide, 0.1g of sodium thiosulfate, redox potential Eh=-0.31v. After stirring evenly, put the pretreated sample into a 1L high-temperature and high-pressure reactor with a filling rate of 70%. Turn on the stirring paddle, set the stirring rate to 1200 rpm, and adjust the heating rate to 1K / min. When the temperature reaches 180°C, keep it warm After 3 hours, the pressure was 0.45 MPa, and then cooling water was passed into the ring cooling pipe for cooling (the cooling rate was 50K / min) to lower the temperature to obtain the amorphous solid of arsenic sulfide. Th...

Embodiment 2

[0045] Take arsenic sulfide slag from a lead-zinc smelter produced by sulfuric acid sodium sulfide sulfidation treatment. The slag has been stockpiled in the enterprise for many years. 0.07%, zinc 0.13%, lead 0.012%, cadmium 0.001%. Take 200g of its slag, add 400g of water, the pH is 2.6, add 1g of ferrous sulfide, the redox potential Eh=-0.21v. After stirring evenly, put it into a 1L (filling rate of 60%) high-temperature and high-pressure reactor, turn on the stirring paddle, set the stirring rate to 100 rpm, adjust the heating rate to 5K / min, and keep it warm for 2 hours when the temperature reaches 200°C. After the temperature, the pressure is 0.52 MPa, and then the air is naturally cooled (cooling rate 2K / min). According to the experimental results, the arsenic sulfide amorphous solidified block obtained has arsenic leaching toxicity of 0.62 mg / L and block compressive strength of 11.6 MPa.

Embodiment 3

[0047] The difference from Example 1 is that arsenic sulfide slag produced from high-arsenic electrolytic waste liquid of another lead-zinc smelter is selected, and the mass content of the slag is 4.15% cadmium, 0.81% zinc, and 24% arsenic. The arsenic leaching toxicity obtained after the experimental treatment was 1.2mg / L.

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Abstract

The invention provides a hydrothermal stabilized curing treatment method of arsenic sulfide residue water. According to the method, the liquid-solid ratio, pH and redox potential of arsenic sulfide residues are adjusted, then the arsenic sulfide residues enter a high-temperature and high-pressure hydrothermal reaction kettle for a curing reaction, and hydrothermal stabilized curing of the arsenic sulfide residues is realized by controlling the reaction temperature, reaction pressure, stirring rate, reaction time, cooling rate and cooling manner. The method is simple in treatment process and low in cost and has obvious economic and environment benefits. The arsenic sulfide residues produced in acid arsenic wastewater sulfidizing in smelting, electroplating, fertilizer (phosphate fertilizer) production, chemical engineering and other industries are used as the object, after hydrothermal stabilized curing treatment, the arsenic leaching toxicity (see sulfuric acid and nitric acid method, the leaching method in HJT 299-2007) concentration can be decreased to 1 mg / L or below, the compressive strength can reach 10 MPa or above, the specification of solid waste identification standard-leaching toxicity identification (GB5085.3-2007) is conformed, and the hazardous waste landfill pollution control standard (GB18598-2001) can be met.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a new method for hydrothermally stable solidification of arsenic sulfide slag. Background technique [0002] my country's non-ferrous metal smelters produce a large amount of high-arsenic polluted acid and high-arsenic electrolytic waste liquid every year. At present, the sulfidation precipitation process is generally used for high-arsenic acidic wastewater. This process is simple, the treatment effect is good, and the amount of slag is less than that of gypsum neutralization slag. However, the arsenic sulfide slag produced by the sulfidation of acidic wastewater is difficult to filter due to the small arsenic sulfide gel particles, high moisture content, and large storage area, which will emit hydrogen sulfide odor. Great storage difficulties and secondary pollution. Arsenic sulfide slag cannot be properly treated and disposed of. On the one hand, it limits th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33A62D101/47
CPCA62D3/33A62D2101/47
Inventor 闵小波柴立元姚理为梁彦杰唐崇俭柯勇杨志辉王云燕史美清徐慧
Owner CENT SOUTH UNIV
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