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Gradient arsenic removing method for high-arsenic metallurgical wastes

A metallurgical waste and gradient technology, applied in the direction of improving process efficiency, can solve the problems of not meeting large-scale production, poor pyrolysis separation effect, serious secondary pollution, etc., and achieves low production cost and reduced arsenic content. , the effect of reducing waste water discharge

Active Publication Date: 2012-04-11
HUNAN ZHANTAI NON FERROUS METALS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since some compounds such as lead, antimony, and tin with slightly higher boiling points than arsenic compounds will also volatilize with arsenic trioxide, the separation effect of fire method dearsenic is poor, and the generated arsenic trioxide flue gas will cause serious secondary pollution
Chinese patent CN101942567A "A Method for Removing Arsenic and Antimony from Anode Slime Containing Multivalent Composite Arsenic and Antimony Compounds" reports a method for removing arsenic by fire method through vacuum dynamic evaporation, which can reduce the temperature of fire method for arsenic removal To alleviate the volatilization of compounds such as lead, antimony, and tin, but the requirements for equipment are very high. At present, there are no vacuum high-temperature furnaces that can meet large-scale production at home and abroad.
However, this method produces a large amount of arsenic-containing dust during the process of mixing, roasting, and loading and unloading of furnace materials, and its secondary pollution is even more serious than the arsenic trioxide flue gas produced by fire-based arsenic removal.
Therefore, there is currently no method in the prior art that can simultaneously meet the requirements of efficient, safe and environmentally friendly arsenic removal

Method used

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  • Gradient arsenic removing method for high-arsenic metallurgical wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Raw material, high arsenic fumes produced by a copper smelter in Jiadi, its main components are (%): As 25.38%, Cu 4.41%, Pb 45.28%. Take 100g of the above raw material, add 400mL of water, then raise the temperature to 95°C, stir at constant temperature for 3 hours, and then heat filter to obtain 86.43g of water leaching residue with arsenic content of 13.88%, and the arsenic removal rate is 52.73%. The leaching solution was cooled and crystallized to precipitate 11.27 g of arsenic trioxide. The water leaching slag continues to adopt oxidative acid leaching, the oxidizing agent is hydrogen peroxide, and the composition of the leaching solution is: (2mol / L H 2 SO 4 solution 200mL)+(30%H 2 o 2100mL), the leaching temperature was 70°C, and the mixture was stirred at constant temperature for 4 hours. The arsenic content of filter residue obtained after oxidative acid leaching was 1.61%, and the leaching rate was 90.4%. Combining water leaching and acid leaching, the t...

Embodiment 2

[0037] Raw material, high arsenic fume produced by a lead-zinc smelter in Yidi, its main components (%): As 21.25%, Pb 20.43%, Cu 3.14%, Zn 7.28%. Take 100g of the above-mentioned raw material, add water 300mL, then raise the temperature to 85°C, stir at constant temperature for 4 hours, then heat filter, the arsenic content in the water leaching residue is 11.54%, and the leaching rate is 54.30%. The water leaching slag continues to be leached by oxidative acid, the oxidant is hydrogen peroxide, and the composition of the leaching solution is: (1mol / L H 2 SO 4 solution 300mL)+(15%KMn 2 o 4 100mL), the leaching temperature was 70°C, and the mixture was stirred at constant temperature for 4 hours. The arsenic content of filter residue obtained after oxidative acid leaching was 1.42%, and the leaching rate was 91.3%. Combining water leaching and acid leaching, the total arsenic removal rate is 95.10%. The filtrate after water immersion is condensed and crystallized to prec...

Embodiment 3

[0039] Raw material, high-arsenic anode slime produced by an electrolysis plant in Bingdi, its main components (%): As 13.28%, Pb 22.15%, Cu 3.23%. Take 100g of the above-mentioned raw materials, add 500mL of water, then raise the temperature to 90°C, stir at constant temperature for 3 hours, then heat filter, the arsenic content in the water leaching residue is 7.89%, and the leaching rate is 43.43%. The water leaching slag continues to adopt oxidative acid leaching, the oxidant is hydrogen peroxide, and the composition of the leachate is: (0.8mol / L H 2 SO 4 solution 300mL)+(15%NaClO 4 100mL), the leaching temperature was 27°C (room temperature), and stirred for 4 hours. The arsenic content of filter residue obtained after oxidative acid leaching is 1.23%. Combining water leaching and acid leaching, the total arsenic removal rate is 93.21%. The filtrate after water immersion is condensed and crystallized to precipitate arsenic trioxide product with a purity of 92.2%.

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Abstract

The invention provides a gradient arsenic removing method for high-arsenic metallurgical wastes, which is generally suitable for comprehensive arsenic removing treatments of high-arsenic smoke dust generated in the smelting process of lead, zinc, antimony, copper, tin and the like, high-arsenic anode mud generated in the electrolytic process of wet lead, silver, copper and the like and other metallurgical wastes. The method comprises two stages of water leaching arsenic removal and oxidizing acid leaching arsenic removal and specifically comprises the following steps of: first, selectively dissolving out free arsenic trioxide and water soluble arsenate (like sodium arsenate and potassium arsenate) through water leaching; and then further leaching out indissolvable arsenate and arsenic sulfide in the water leaching residue as well as little incomplete arsenic trioxide dissolved out by water by using a mixed leaching liquor of acid and water soluble oxidizing agent. The method provided by the invention has the advantages of low consumption of acid and alkali, high arsenic removing efficiency, safety, environment friendliness and suitability for arsenic removing treatment of various arsenic contained metallurgical wastes, in particular for arsenic removing treatment of the smoke dust with high content of free arsenic trioxide.

Description

technical field [0001] The invention relates to a method for removing arsenic from high-arsenic metallurgical waste produced in pyrometallurgical or hydrometallurgical processes, such as high-arsenic smoke and dust produced in the smelting process of lead, zinc, antimony, copper, tin, etc., as well as crude lead, silver, copper, etc. Comprehensive arsenic removal treatment of metallurgical waste such as high arsenic anode slime produced in the electrolysis process; especially involving arsenic removal treatment of arsenic-containing metallurgical waste with high content of free arsenic trioxide. Background technique [0002] Arsenic is often associated with lead, zinc, antimony, copper, tin, gold, silver, indium, platinum, rhodium, palladium and other precious metals in the earth's crust. Due to the relatively low melting point and sublimation temperature of arsenic compounds such as arsenic and arsenic trioxide, in the pyrometallurgical process, arsenic compounds are easily...

Claims

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Application Information

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IPC IPC(8): C22B1/11C22B3/04C22B3/06
CPCY02P10/20
Inventor 唐新村曹圣金贾海曹峰肖元化黄富勤龚美丽
Owner HUNAN ZHANTAI NON FERROUS METALS
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