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Method for metallic arsenic production directly through reducing sulfur-fixed roasting of arsenic precipitating slag

A technology for metal arsenic and roasting products, applied in the direction of improving process efficiency, can solve the problems of ineffective utilization of arsenic resources, high cost of raw material preparation, and large environmental pollution, and achieve efficient and harmless utilization, high product value, comprehensive good recovery effect

Active Publication Date: 2017-05-31
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a product with high product value, process Clean, low energy consumption, easy to carry out industrialized production of arsenic slag reduction sulfur fixation roasting method for direct production of metal arsenic

Method used

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  • Method for metallic arsenic production directly through reducing sulfur-fixed roasting of arsenic precipitating slag

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 residue (dry residue) used as the experimental raw material are (wt.%): S 27.24, As 19.26, Cu0.37, Pb 3.86, Bi 0.070, Fe 1.02, Zn0.19, Ni 0.08, Cd 1.3, Se 0.81; the chemical composition (wt. %) of reduced coke powder is: C86.56, S2.79, SiO 2 5.17, CaO1.03, Al 2 o 3 3.94, MgO0.42; lead oxide powder is chemically pure grade reagent.

[0049] S1. Weigh 200g of arsenic slag, 40g of lead 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 400°C for 2.0h;

[0050] S2. Add 2g of coke powder to the roasted product in the vacuum furnace in step S1, raise the temperature of the vacuum furnace to 700°C, turn on the vacuum system, distill for 2.0h under the condition of a vacuum degree of 10Pa, and condense at the same time to separate the metal ...

Embodiment 2

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

[0056] S1. Weigh 200g of arsenic precipitation slag, 70g of lead oxide powder, and 20g 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 6g of coke powder to the roasted product in the vacuum furnace in step S1, raise the temperature of the vacuum furnace to 700°C, turn on the vacuum system, distill for 2.0h under the condition of a vacuum degree of 10Pa, and condense at the same time to separate and obtain metallic arsenic and distillation residues;

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

[0059] The mass of the finally collected volatile matter and metal arsenic was 37.12g, the content of arsenic was analyzed to be 92.25%, and the direct recover...

Embodiment 3

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

[0063] S1. Weigh 200g of arsenic precipitation slag, 100g of lead 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 300°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 20Pa, and condense at the same time to separate and obtain metallic arsenic and distillation residues;

[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 metallic arsenic was 34.89g, the arsenic content was 96.11% in the analysis, and the direct recov...

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Abstract

The invention discloses a method for metallic arsenic production directly through reducing sulfur-fixed roasting of arsenic precipitating slag. The arsenic precipitating slag produced in the process of lead refinery through the fire assaying method serves as a raw material, lead oxide and a reducing agent are added, reducing sulfur-fixed roasting is conducted at the temperature of 300-700 DEG C after ingredients are mixed, roasted products are subjected to vacuum separation at the temperature of 700-1000 DEG C, and thus metallic arsenic is directly obtained; and distillation slag is subjected to sorting of reselection and flotation to obtain multi-metal powder and lead sulfide concentrates correspondingly, and valuable metal is recovered and returns to the smelting working procedure. According to the method for metallic arsenic production directly through reducing sulfur-fixed roasting of the arsenic precipitating slag, efficient harmless utilization of the arsenic precipitating slag containing lead can be achieved, high-value products of arsenic are directly produced, the process is short, energy consumption is low, the process is clean, and the direct recovery rate of the metallic arsenic reaches up to 96.32%; and meanwhile, recovery of the valuable metal existing in the arsenic precipitating slag is completed, the lead oxide is recovered in a high-quality lead sulfide concentrate mode finally, the resource utilization rate is high, and comprehensive recovery is good.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal metallurgy, and more specifically relates to a method for directly producing metallic arsenic by reducing and roasting arsenic precipitation slag for sulfur fixation. 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 re...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B1/02C22B7/04C22B5/16C22B13/02
CPCC22B1/02C22B5/16C22B7/04C22B13/025C22B30/04Y02P10/20
Inventor 叶龙刚夏志美胡宇杰陈艺锋文平
Owner HUNAN UNIV OF TECH
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