Method for metallic arsenic production directly through reducing sulfur-fixed roasting of arsenic sulfide residues

A technology of arsenic sulfide and metal arsenic, which is applied in the field of non-ferrous metal metallurgy, can solve the problems of ineffective utilization of arsenic resources, large environmental pollution, and high production cost, and achieve the effects of easy industrial production, good comprehensive recovery, and high product value

Active Publication Date: 2017-05-31
广西河池鑫银环保科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a product with high value, Process clean, low energy consumptio...

Method used

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  • Method for metallic arsenic production directly through reducing sulfur-fixed roasting of arsenic sulfide residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Process flow chart of the present invention is attached figure 1 shown.

[0048] The main components of the arsenic sulfide slag (dry slag) used as the experimental raw material are (wt.%): S 54.15, As 33.08, Cu4.45, Pb 0.93, Bi 1.47, Fe 0.25, Cu 0.24, Zn 0.49, Ni 0.11, Cd 0.27, Sb 0.88, Se 1.01; the chemical composition (wt.%) of reduced coke powder is: C 86.56, S 2.79, SiO 2 5.17, CaO 1.03, Al 2 o 3 3.94, MgO0.42; copper oxide powder is chemically pure grade reagent.

[0049] S1. Weigh 200g of arsenic sulfide slag, 30g of copper oxide powder, and 10g of coke powder of the above ingredients, mix all the materials evenly, put them into a corundum crucible, put them into a vacuum furnace and roast at 800°C for 2.0h;

[0050] S2. Add 2g of coke powder to the roasted product in the vacuum furnace in step S1, then raise the temperature of the vacuum furnace to 900°C, turn on the vacuum system, distill for 2.0h under the condition of a vacuum degree of 10Pa, condense a...

Embodiment 2

[0055] Experimental raw materials, reagents and steps are the same as in Example 1.

[0056] S1. Weigh 200g of arsenic sulfide slag, 60g of copper oxide powder, and 10g of coke powder of the above ingredients, mix all the materials evenly, put them into a corundum crucible, put them into a vacuum furnace and roast at 500°C for 1.0h;

[0057] S2. Add 4g of coke powder to the roasted product in the vacuum furnace in step S1, raise the temperature of the vacuum furnace to 800°C, turn on the vacuum system, distill for 2.0h under the condition of a vacuum degree of 10Pa, condense and separate to obtain metal arsenic and distillation residue ;

[0058] Condensation has been carried out to collect volatiles throughout the reduction sulfur fixation roasting process and vacuum distillation process.

[0059] The final mass of volatiles and metallic arsenic collected was 61.59g, the arsenic content was 92.84% in analysis, and the direct recovery rate of arsenic was calculated to be 86.3...

Embodiment 3

[0062] Experimental raw materials, reagents and steps are the same as in Example 1.

[0063] S1. Weigh 200g of arsenic sulfide slag, 90g of copper oxide powder, and 40g of coke powder of the above ingredients, mix all the materials evenly, put them into a corundum crucible, put them into a vacuum furnace and roast at 600°C for 4.0h;

[0064] S2. Add 6g of coke powder to the roasted product in the vacuum furnace in step S1, raise the temperature of the vacuum furnace to 800°C, turn on the vacuum system, distill for 4.0h under the condition of a vacuum degree of 10Pa, condense and separate to obtain metal arsenic and distillation residue ;

[0065] Condensation has been carried out to collect volatiles throughout the reduction sulfur fixation roasting process and vacuum distillation process.

[0066] The mass of the finally collected volatile matter and metal arsenic was 66.78g, the arsenic content was 91.17% in analysis, and the direct recovery rate of arsenic was calculated t...

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Abstract

The invention discloses a method for metallic arsenic production directly through reducing sulfur-fixed roasting of arsenic sulfide residues. The arsenic sulfide residues produced in the acidic wastewater purifying working procedure of a copper smelting plant serve as a raw material, meanwhile cupric oxide powder and a reducing agent are added, low-temperature reducing sulfur-fixed roasting is conducted after metallurgy calculation and ingredient mixing are conducted, and volatility of arsenic is utilized to enable roasted products to be subjected to vacuum separation in the reducing atmosphere so that the crude metal arsenic and distillation residues can be obtained; and distillation residues are subjected to a reselection technique for separation to obtain multi-metal powder and tailings, and the tailings are subjected to a flotation technique to obtain final residues and copper sulfide concentrates. According to the method for metallic arsenic production directly through reducing sulfur-fixed roasting of the arsenic sulfide residues, efficient arsenic removal of the arsenic sulfide residues can be achieved, harmless high-value products of the arsenic are directly produced, the process is short, energy consumption is low, the process is clean, and the direct recovery rate of the metal arsenic reaches up to 96.45%; and meanwhile, recovery of valuable metal existing in the arsenic sulfide residues is completed, and the cupric oxide powder is recovered in a high-quality copper sulfide concentrate mode finally.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and more specifically relates to a method for directly producing metallic arsenic by reducing sulfur-fixing roasting of arsenic sulfide slag. Background technique [0002] Metal arsenic is a silver-gray metal, and its toxicity is much lower than that of arsenic oxide and arsenate. It is mainly used in the fields of semiconductor tubes, communications, large-scale integrated circuits, remote sensing and far-infrared detection. At present, the production methods of metal arsenic include chlorination reduction method, sublimation distillation method, thermal decomposition method, sulfidation-reduction method, and regional smelting method and single crystal method for high-purity arsenic production. These methods mainly use pure arsenic oxide or crude metal Arsenic as raw material, after high temperature carbon / hydrogen reduction or SnCl in solution 2 Obtained by reduction, there are prob...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B1/02C22B7/04C22B5/16C22B15/00
CPCC22B1/02C22B5/16C22B7/04C22B15/0028C22B30/04Y02P10/20
Inventor 叶龙刚夏志美胡宇杰陈艺锋文平
Owner 广西河池鑫银环保科技有限公司
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