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Method for separating and recycling valuable metal from pressure leached high sulphur slag

A pressure leaching and valuable metal technology, applied in the field of bismuth valuable metal, antimony, separation and recovery of sulfur, can solve the problems of low comprehensive utilization rate of elemental sulfur, secondary pollution of waste residue, large consumption of reagents, etc. The effect of energy, simple equipment and easy operation

Inactive Publication Date: 2009-08-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, pyrometallurgy processes such as redox roasting are mainly used in China, the purpose is only to recover their valuable metals; although the desulfurization rate is high, the conversion of elemental sulfur into SO 2 ; Secondly, ammonium sulfide desulfurization, acid leaching, alkali leaching and other wet smelting processes are used, but these processes and technologies have large consumption of reagents, easy to produce secondary pollution of waste residues, complex procedures and comprehensive utilization of elemental sulfur. not high disadvantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Get 100g of pressure-leached high-sulfur slag, and analyze that the sulfur content in the slag is 86.65%; the antimony content is 0.27%; : 1 condition, reaction 0.5h; Immediately filter and separate the hot kerosene rich in elemental sulfur and the desulfurization slag rich in valuable metals such as antimony and bismuth; Obtain 57.7g of desulfurization slag, and the antimony content in the desulfurization slag is 0.47%, containing The amount of bismuth is 6.92%;

[0018] (2) Add the desulfurization slag obtained above into a mixed solution containing 200 g / L sulfuric acid and 150 g / L sodium chloride, under the condition of controlling the liquid-solid ratio to 6:1, the temperature is 35°C, react for 0.5 h, and filter and separate Chloride salt leaching solution and copper-containing residue; the concentration of antimony in the chloride salt leaching solution reaches 0.79g / L, and the concentration of bismuth reaches 13.43g / L;

[0019] (3) The chlorine salt leachin...

Embodiment 2

[0025] (1) Get 100g of pressure leached high-sulfur slag, and analyze that the sulfur content in the slag is 86.65%; the antimony content is 0.27%; : 1 condition, reaction 0.5h; Immediately filter and separate hot kerosene rich in elemental sulfur and desulfurization slag rich in valuable metals such as antimony and bismuth; obtain desulfurization slag 29g, antimony content in the desulfurization slag is 0.96%, bismuth The amount is 13.71%;

[0026] (2) Add the desulfurization slag obtained above into a mixed solution containing 50g / L sulfuric acid and 100g / L sodium chloride, control the liquid-solid ratio to 8:1, and the temperature is 55°C, react for 0.5h, filter and separate the chloride salt Leaching solution and copper-containing residue; the concentration of antimony in the chloride salt leaching solution reaches 1.08g / L, and the concentration of bismuth reaches 15.21g / L;

[0027] (3) The chlorine salt leaching solution of above gained is evenly added into distilled wat...

Embodiment 3

[0033] (1) Get 100g of pressure leached high-sulfur slag, and analyze that the sulfur content in the slag is 86.65%; the antimony content is 0.27%; : Under the condition of 1, react for 0.5h; immediately filter and separate hot kerosene rich in elemental sulfur and desulfurization slag rich in valuable metals such as antimony and bismuth; obtain desulfurization slag 18g, and the antimony content in the desulfurization slag is 1.50%, containing bismuth The amount is 22.05%;

[0034] (2) Add the desulfurization slag obtained above into a mixed solution containing 150 g / L sulfuric acid and 150 g / L sodium chloride, under the condition of controlling the liquid-solid ratio to 10:1, the temperature is 65 °C, react for 0.5 h, and filter and separate Chloride salt leaching solution and copper-containing residue; the concentration of antimony in the chloride salt leaching solution reaches 1.18g / L, and the concentration of bismuth reaches 17.98g / L;

[0035] (3) The chlorine salt leachi...

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Abstract

The invention discloses a method for separating and reclaiming valuable metal from high-sulfur slag subjected to pressure leaching. The method comprises: firstly, adding kerosene into the high-sulfur slag subjected to pressure leaching to leach out elemental sulfur, filtering and separating hot kerosene containing the elemental sulfur and desulfurated slag containing antimony and bismuth, and separating out the elemental sulfur after cooling the hot kerosene; secondly, adding the desulfurated slag containing the antimony and the bismuth into a mixed solution of sulfuric acid and sodium chloride, filtering and separating chlorine salt lixivium and copper-containing residue, and returning the copper-containing residue to an arsenic filter cake system for pressure leaching; uniformly adding distilled water into antimony and bismuth lixivium to control the pH value, and obtaining a liquid after antimony precipitation and antimony oxychloride through hydrolysis and precipitation; uniformly adding ammonia water into the liquid after antimony precipitation to control the pH value, and obtaining a liquid after bismuth precipitation and the antimony oxychloride through hydrolysis and precipitation; and returning the liquid after bismuth precipitation to the antimony precipitation process. The total recovery rate of the sulfur reaches 97 to 98 percent, the total recovery rate of the antimony reaches 81 to 82 percent, and the total recovery rate of the bismuth reaches 95 to 96 percent. The invention has the advantages of simple and convenient operation, simple equipment and good application value.

Description

technical field [0001] The invention relates to a method for separating and recovering sulfur, antimony and bismuth valuable metals from high-sulfur slag leached from arsenic filter cake under pressure. Background technique [0002] The sulfur content in the high-sulfur slag from pressure leaching is relatively high. It is of positive significance to separate and recover the sulfur from the valuable metals such as antimony and bismuth by adopting appropriate methods, both in terms of resource recovery and environmental protection. At present, pyrometallurgy processes such as redox roasting are mainly used in China, the purpose is only to recover their valuable metals; although the desulfurization rate is high, the conversion of elemental sulfur into SO 2 ; Secondly, ammonium sulfide desulfurization, acid leaching, alkali leaching and other wet smelting processes are used, but these processes and technologies have large consumption of reagents, easy generation of secondary po...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/26C22B3/46C22B30/02C22B30/06
CPCY02P10/20
Inventor 张宝李倩彭春丽张佳峰曹璇
Owner CENT SOUTH UNIV
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