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Long-term stable curing method for thermal copolymerization of arsenic sulfide slag

A technology of arsenic sulfide and copolymerization, which is applied in the direction of protective devices against harmful chemicals, etc., and can solve problems such as increased arsenic leaching concentration, poor anti-aging performance of cured body, and decreased curing and stabilization effects.

Active Publication Date: 2020-08-25
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

But we find that the aging resistance of the cured body obtained by this method is relatively poor, and as time goes on, the cured body gradually ages and causes surface sulfur and arsenic sulfide to separate out ( Figure 1a , Figure 1b and figure 2 ), leading to a sharp increase in the leaching concentration of arsenic ( image 3 ), the curing and stabilizing effect decreases

Method used

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  • Long-term stable curing method for thermal copolymerization of arsenic sulfide slag
  • Long-term stable curing method for thermal copolymerization of arsenic sulfide slag
  • Long-term stable curing method for thermal copolymerization of arsenic sulfide slag

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Effect test

Embodiment 1

[0032] The arsenic sulfide slag obtained by sulfide removal of arsenic from polluted acid wastewater, industrial-grade sulfur powder, and cyclopentadiene are stirred and heated at 140°C until melting at a mass ratio of 1:2:0.3, and then cooled to obtain a solidified arsenic sulfide slag. The specific flow chart can be found in Figure 4 . The leaching concentration of arsenic in the obtained solidified body is 0.5mg / L (sulfuric acid nitric acid method, HJ / T299-2007), and after 18 months at room temperature, the leaching concentration of arsenic is 0.49mg / L, the volume expansion ratio is 0.48, and the compressive strength 10.5MPa, which has reached the landfill waste entry requirements specified in the Hazardous Waste Landfill Pollution Control Standard (GB18598-2019) (the arsenic concentration is less than 1.2mg / L). Figure 5 is the topography of the cured body after aging for 18 months, Figure 6 is the volume change of arsenic sulfide slag before and after solidification. ...

Embodiment 2

[0035] The arsenic sulfide slag, waste sulfur powder, and limonene obtained by sulfide removal of arsenic from acidic mine wastewater are stirred and heated at 170°C at a mass ratio of 1:4:0.2 until molten, and then cooled to obtain a solidified arsenic sulfide slag. The leaching concentration of arsenic in the obtained solidified body is 0.35mg / L (sulfuric acid nitric acid method, HJ / T299-2007), and after 12 months at room temperature, the leaching concentration of arsenic is 0.37mg / L, the volume increasing ratio is 0.95, and the compressive strength 11.3MPa, which has reached the entry requirements for landfill waste stipulated in the Hazardous Waste Landfill Pollution Control Standard (GB 18598-2019).

[0036] In the control experiment without adding limonene, the leaching concentration of arsenic in the cured body increased from 1.65mg / L at the beginning to 78.82mg / L after aging for 12 months, which did not meet the pollution control standard for hazardous waste landfill (G...

Embodiment 3

[0038]The sulfurized arsenic slag, waste sulfur mud and sulfur rubber LP-31 obtained by sulfiding the polluted acid wastewater for arsenic removal are stirred and heated at 200°C until melting at a mass ratio of 1:2.5:0.4, and then cooled to obtain a solidified body of arsenic sulfide slag. The leaching concentration of arsenic in the obtained solidified body is 0.89mg / L (sulfuric acid nitric acid method, HJ / T299-2007), and after 9 months at room temperature, the leaching concentration of arsenic is 0.91mg / L, the volume increasing ratio is 0.71, and the compressive strength 11.8MPa, which has reached the entry requirements for landfill waste stipulated in the Hazardous Waste Landfill Pollution Control Standard (GB 18598-2019).

[0039] In the control experiment without adding sulfur rubber LP-31, the leaching concentration of arsenic in the cured body increased from 2.38mg / L at the beginning to 76.36mg / L after aging for 9 months, which did not reach the hazardous waste landfill...

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Abstract

The invention relates to a long-term stable solidification method for thermal copolymerization of arsenic sulfide slag, belonging to the technical field of solid waste solidification / stabilization treatment. The method comprises the following steps: weighing arsenic sulfide slag, sulfur and an anti-aging agent according to a mass ratio of 1: (0.1-5): (0.05-0.5), and carrying out heating and stirring to form a melt; and cooling the obtained melt to form a cured body. According to the method, a thermal copolymerization reaction between the arsenic sulfide slag and the sulfur and the anti-aging treatment of a copolymer are utilized, so the efficient and stable solidification of the arsenic sulfide slag is realized; the leaching concentration of arsenic in the obtained solidified body is lowerthan 1.0 mg / L, long-term stability is high, a compatibilization ratio is lower than 1, compressive strength can reach 10 MPa or above, and the allowable landfill control limit requirement of an arsenic leaching concentration of lower than 1.2 mg / L specified in hazardous waste landfill pollution control standards is met.

Description

technical field [0001] The invention relates to a method for long-term stable solidification of arsenic sulfide slag thermal copolymerization, which belongs to the technical field of solid waste solidification / stabilization treatment. Background technique [0002] my country's mining, mineral processing, and non-ferrous metal smelting industries all produce a large amount of arsenic-containing acidic wastewater, and only the ferrous metal smelting industry discharges more than 390 million tons of acidic wastewater (polluted acid) annually. For these arsenic-containing acidic wastewaters, sulfuration is often used to treat them. The principle is that arsenic and sulfur ions (S 2- ) reaction to generate arsenic sulfide precipitate with a very small solubility (As 2 S 3 ) to remove arsenic. Since wastewater often contains other heavy metals, and sulfur ions are partially oxidized to generate sulfur (S 8 ), so in addition to arsenic sulfide, there is also a small amount of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33
CPCA62D3/33A62D2101/47
Inventor 彭先佳孔令昊胡星云
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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