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Method for conducting synergistical curing on arsenic-contained gypsum slag and copper slag

A technology of gypsum slag and copper slag, which is applied in the protection device against harmful chemical agents, etc., can solve the problem of low toxicity leaching ability, and achieve the effects of low toxicity migration, good stability, and high arsenic fixation efficiency

Inactive Publication Date: 2019-04-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using copper slag and arsenic-containing gypsum slag under high temperature conditions, the arsenic in gypsum slag is solidified in the copper slag lattice, which has high stability and low toxicity leaching ability

Method used

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  • Method for conducting synergistical curing on arsenic-contained gypsum slag and copper slag
  • Method for conducting synergistical curing on arsenic-contained gypsum slag and copper slag
  • Method for conducting synergistical curing on arsenic-contained gypsum slag and copper slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The method for the synergistic solidification of this arsenic-containing gypsum slag and copper slag is as follows:

[0019] (1) The arsenic-containing gypsum slag (the gypsum slag comes from a copper smelter in the Southwest region after the lime-iron salt method is used to treat the solid sediment of the dirty acid, the main composition is shown in Table 1) and the carbon powder (the element analysis composition of the carbon powder is as follows: Table 2) Mix according to the molar ratio of arsenic to carbon of 4:1, and react at a temperature of 950°C for 1.5h;

[0020] (2) According to the mass ratio of reactant, copper slag (the main component of copper slag is shown in Table 3) and fly ash (the main component of fly ash is shown in Table 4) is the ratio of 14:17:2, to step (1 ) into the reactant, add copper slag and fly ash, and react at a temperature of 1100°C for 2 hours to obtain high-temperature molten arsenic-fixed copper slag;

[0021] (3) Aft...

Embodiment 2

[0032] Embodiment 2: The method for the synergistic solidification of the arsenic-containing gypsum slag and copper slag is as follows:

[0033] (1) The arsenic-containing gypsum slag (the gypsum slag comes from a copper smelter in the Southwest region after the lime-iron salt method is used to treat the solid sediment of the dirty acid, the main composition is shown in Table 1) and the carbon powder (the element analysis composition of the carbon powder is as follows: Table 2) Mix according to the molar ratio of arsenic to carbon of 5:1, and react at a temperature of 1000°C for 1.2h;

[0034] (2) According to the mass ratio of reactant, copper slag (the main component of copper slag is shown in Table 3) and fly ash (the main component of fly ash is shown in Table 4) is the ratio of 14:15:1.5, to step (1 ) into the reactant, add copper slag and fly ash, and react at a temperature of 1150°C for 1.5h to obtain high-temperature molten arsenic-fixed copper slag;

[0035] (3) Afte...

Embodiment 3

[0046] Embodiment 3: The method for the synergistic solidification of the arsenic-containing gypsum slag and copper slag is as follows:

[0047] (1) The arsenic-containing gypsum slag (the gypsum slag comes from a copper smelter in the Southwest region after the lime-iron salt method is used to treat the solid sediment of the dirty acid, the main composition is shown in Table 1) and the carbon powder (the element analysis composition of the carbon powder is as follows: Table 2) Mix according to the molar ratio of arsenic to carbon of 6:1, and react at a temperature of 1100°C for 1 hour;

[0048] (2) According to the mass ratio of reactant, copper slag (the main component of copper slag is shown in Table 3) and fly ash (the main component of fly ash is shown in Table 4) is the ratio of 14:11:1, to step (1 ) into the reactant, add copper slag and fly ash, and react at a temperature of 1200°C for 1 hour to obtain high-temperature molten arsenic-fixed copper slag;

[0049] (3) St...

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Abstract

The invention discloses a method for conducting synergistical curing on arsenic-contained gypsum slag and copper slag and belongs to the fields of heavy metal pollution disposal and metallurgical solid waste utilization. The method includes the steps of firstly, uniformly mixing the arsenic-contained gypsum slag with carbon powder to carry out a high-temperature carbothermal reduction reaction; then, adding the copper slag and fly ash into the reactants to carry out a high-temperature curing reaction to obtain the high-temperature molten arsenic-fixing copper slag; rapidly air-cooling the high-temperature molten arsenic-fixing copper slag to form arsenic-contained solid substances; introducing flue gas generated by the high-temperature carbothermal reduction reaction and the high-temperature curing reaction into a calcium hydroxide solution for a neutralization reaction, filtering, drying and grinding precipitates after the reaction, and then carrying out circular arsenic-fixing disposal again. The method has the advantages that the arsenic-fixing effect is remarkable, the stability of the arsenic-fixing copper slag after the reaction is high, the toxicity mobility is low, secondary recycling can be carried out, and a broad application prospect is provided.

Description

technical field [0001] The invention relates to a method for synergistic solidification of arsenic-containing gypsum slag and copper slag, belonging to the fields of heavy metal pollution control and metallurgical solid waste utilization. Background technique [0002] At present, the arsenic-containing sewage produced by non-ferrous smelting is mainly treated by the lime-iron salt method and then converted into standard industrial water, but at the same time, a large amount of arsenic-containing and heavy metal gypsum slag is also produced. According to statistics, the lime-iron salt process of copper smelters with an annual output of 100,000 tons produces 10,000 tons of gypsum slag per year. As a result, China's nonferrous metal smelting industry produces about 1 million tons of gypsum slag per year. Gypsum slag is a hazardous solid waste. Although it has high arsenic fixation efficiency, it has strong toxicity migration ability and easy toxicity leaching. At the present s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33
CPCA62D3/33
Inventor 祁先进李永奎祝星王华李孔斋魏永刚胡建杭
Owner KUNMING UNIV OF SCI & TECH
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