Hot-pressing sintering curing method for arsenic sulfide slag

Abstract

The invention provides a hot-pressing sintering curing method for arsenic sulfide slag. The hot-pressing sintering curing method comprises the following steps that firstly, the pH value of the arsenicsulfide slag is adjusted to be 1-7; the arsenic sulfide slag subjected to a neutralization reaction is dried and dehydrated; then sulfur powder is added, and after even stirring and mixing are conducted, vibrating compaction and briquetting forming are conducted; and finally, a formed arsenic sulfide slag block is placed in a hot-pressing sintering curing reaction device to be subjected to hot-pressing sintering curing so as to obtain the arsenic sulfide slag hot-pressing sintered block. According to the arsenic sulfide slag hot-pressing sintered block obtained by treating through the hot-pressing sintering curing method, the leaching toxicity of arsenic can be reduced by 90% or above, and the compressive strength of the cured block can reach 10 MPa or above. The hot-pressing sintering curing method is simple in treatment technology, low in cost and obvious in economic benefit and environmental benefit.

Description

technical field

[0001] The invention relates to the field of comprehensive utilization and treatment of arsenic-containing waste residues, in particular to a treatment method for hot-pressing, sintering and solidifying arsenic sulfide residues. Background technique

[0002] my country's non-ferrous metal industry produces a large amount of high-concentration arsenic-containing waste acid and high-concentration arsenic-containing electrolyte every year. For these high-arsenic waste liquids, hydrogen sulfide gas, sodium hydrogen sulfide, sodium sulfide, etc. are currently used as sulfidation precipitation processes. After treatment, a large amount of arsenic sulfide slag was obtained. The arsenic content in these arsenic sulfide slag is high, and the arsenic sulfide in it will be naturally oxidized into arsenic oxide if it is placed in the air for too long, which is easy to release and cause secondary pollution; the moisture content of the arsenic sulfide slag is high, and the ...

Examples

Embodiment 1

[0055] The arsenic sulfide slag produced by sulfuric acid sodium sulfide sulfidation treatment of a lead-zinc smelter in Hunan Province showed that the total element mass analysis mainly contained 35.2% As, 31.9% S, 0.15% Fe, 0.08% Zn, 0.23% Cu, 0.02% Sb, Pb 0.01%, the arsenic sulfide slag contains 72% water, and the acidity of the slag is 1.5%. Take 100g of slag, add 0.3g of lime, 0.6g of sodium carbonate, mechanically stir (500r / min) and react uniformly for 30min, the pH at the end of the reaction is 3.0, then protect and dry under nitrogen at 60°C, then add 60% of the weight of arsenic sulfide slag after drying % sulfur was mechanically mixed and stirred for 10 min. After mixing evenly, vibrate and compact, and briquette into shape. After the temperature reaches 140°C, keep warm at 6 MPa and pressurize for 6 hours, and then take out the sintered block after the temperature drops to room temperature. The appearance of arsenic sulfide slag before and after treatment and the ...

Embodiment 2

[0062] Combined with the optimal conditions of Example 1 above, the arsenic sulfide slag produced by the sulfuric acid hydrogen sulfide treatment of a copper smelter in Yunnan was taken, and the mass analysis of all elements showed that it mainly contained As 39.2%, S 22.9%, Fe 0.81%, and Zn 0.60%. , Cu0.53%, Sb 0.30%, Pb 0.10%, the arsenic sulfide slag contains 77% water, and the slag acidity is 1.5%. Take 100g of slag, add 0.6g of calcium carbonate, 0.3g of lime, mechanically stir (500r / min) and react for 30min evenly, the pH of the reaction end point is 3.5, then protect and dry under nitrogen at 60°C, then add 60% of the weight of arsenic sulfide slag after drying % sulfur, mechanically mixed and stirred for 10min. After mixing evenly, vibrate and compact, 6MPa briquetting is formed, after the temperature reaches 160°C, keep the temperature at 6MPa and hold the pressure for 6h, and then take out the sintered block after the temperature drops to normal temperature. The app...

Embodiment 3

[0064] Combined with the optimal conditions of the above example 1, the arsenic sulfide slag produced by a copper smelter in Anhui from the sulfuric acid hydrogen sulfide sulfidation treatment showed that the total element mass analysis mainly contained 25.7% As, the arsenic sulfide slag contained 35% water, and the acidity of the slag was 0.8 %. Take 100g of slag, add 0.6g of calcium carbonate, 0.3g of lime, mechanically stir (500r / min) and react for 30min evenly, the pH of the reaction end point is 3.5, then protect and dry under nitrogen at 60°C, then add 60% of the weight of arsenic sulfide slag after drying % sulfur, mechanically mixed and stirred for 10min. After mixing evenly, vibrate and compact, 6MPa briquetting is formed, after the temperature reaches 160°C, keep the temperature at 6MPa and hold the pressure for 6h, and then take out the sintered block after the temperature drops to normal temperature. The appearance of arsenic sulfide slag before and after treatmen...

technical field

[0001] The invention relates to the field of comprehensive utilization and treatment of arsenic-containing waste residues, in particular to a treatment method for hot-pressing, sintering and solidifying arsenic sulfide residues. Background technique

[0002] my country's non-ferrous metal industry produces a large amount of high-concentration arsenic-containing waste acid and high-concentration arsenic-containing electrolyte every year. For these high-arsenic waste liquids, hydrogen sulfide gas, sodium hydrogen sulfide, sodium sulfide, etc. are currently used as sulfidation precipitation processes. After treatment, a large amount of arsenic sulfide slag was obtained. The arsenic content in these arsenic sulfide slag is high, and the arsenic sulfide in it will be naturally oxidized into arsenic oxide if it is placed in the air for too long, which is easy to release and cause secondary pollution; the moisture content of the arsenic sulfide slag is high, and the ...

Examples

Embodiment 1

[0055] The arsenic sulfide slag produced by sulfuric acid sodium sulfide sulfidation treatment of a lead-zinc smelter in Hunan Province showed that the total element mass analysis mainly contained 35.2% As, 31.9% S, 0.15% Fe, 0.08% Zn, 0.23% Cu, 0.02% Sb, Pb 0.01%, the arsenic sulfide slag contains 72% water, and the acidity of the slag is 1.5%. Take 100g of slag, add 0.3g of lime, 0.6g of sodium carbonate, mechanically stir (500r / min) and react uniformly for 30min, the pH at the end of the reaction is 3.0, then protect and dry under nitrogen at 60°C, then add 60% of the weight of arsenic sulfide slag after drying % sulfur was mechanically mixed and stirred for 10 min. After mixing evenly, vibrate and compact, and briquette into shape. After the temperature reaches 140°C, keep warm at 6 MPa and pressurize for 6 hours, and then take out the sintered block after the temperature drops to room temperature. The appearance of arsenic sulfide slag before and after treatment and the ...

Embodiment 2

[0062] Combined with the optimal conditions of Example 1 above, the arsenic sulfide slag produced by the sulfuric acid hydrogen sulfide treatment of a copper smelter in Yunnan was taken, and the mass analysis of all elements showed that it mainly contained As 39.2%, S 22.9%, Fe 0.81%, and Zn 0.60%. , Cu0.53%, Sb 0.30%, Pb 0.10%, the arsenic sulfide slag contains 77% water, and the slag acidity is 1.5%. Take 100g of slag, add 0.6g of calcium carbonate, 0.3g of lime, mechanically stir (500r / min) and react for 30min evenly, the pH of the reaction end point is 3.5, then protect and dry under nitrogen at 60°C, then add 60% of the weight of arsenic sulfide slag after drying % sulfur, mechanically mixed and stirred for 10min. After mixing evenly, vibrate and compact, 6MPa briquetting is formed, after the temperature reaches 160°C, keep the temperature at 6MPa and hold the pressure for 6h, and then take out the sintered block after the temperature drops to normal temperature. The app...

Embodiment 3

[0064] Combined with the optimal conditions of the above example 1, the arsenic sulfide slag produced by a copper smelter in Anhui from the sulfuric acid hydrogen sulfide sulfidation treatment showed that the total element mass analysis mainly contained 25.7% As, the arsenic sulfide slag contained 35% water, and the acidity of the slag was 0.8 %. Take 100g of slag, add 0.6g of calcium carbonate, 0.3g of lime, mechanically stir (500r / min) and react for 30min evenly, the pH of the reaction end point is 3.5, then protect and dry under nitrogen at 60°C, then add 60% of the weight of arsenic sulfide slag after drying % sulfur, mechanically mixed and stirred for 10min. After mixing evenly, vibrate and compact, 6MPa briquetting is formed, after the temperature reaches 160°C, keep the temperature at 6MPa and hold the pressure for 6h, and then take out the sintered block after the temperature drops to normal temperature. The appearance of arsenic sulfide slag before and after treatmen...

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