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Sulfur slag vacuum volatilizing process for enriching noble metal

A vacuum volatilization and sulfur slag technology, which is applied in the direction of improving process efficiency, can solve research and other problems, and achieve the effects of low vacuum degree and temperature, low energy consumption, and high enrichment ratio

Inactive Publication Date: 2007-06-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huang Xin adopted the method of vacuum distillation, considering the enrichment of copper, nickel, cobalt, and gold in the raw materials, but did not study the enrichment of precious metals such as osmium, yttrium, ruthenium, rhodium, platinum, palladium, and silver in the raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical composition of sulfur slag is 95% S, and the other precious metal content is 5%. Take 1000 grams and put it into the vacuum smelting furnace. After sealing the vacuum furnace, vacuumize it. Control the pressure of the vacuum furnace to 15±5Pa and the temperature to 280±20°C, and then Control the temperature constant to volatilize the sulfur in the raw material, distill for 60 minutes, then lower the temperature and cool down to make the temperature of the vacuum furnace less than 80±10°C, fill the vacuum furnace with nitrogen, and open the vacuum furnace to obtain 80 grams of enriched metal sulfide powder of matter. The volatilization of the material is 87%, and the metal content in the obtained powder enriched with metal sulfide is 50%.

Embodiment 2

[0019] The chemical composition of sulfur slag is: 90% S, the content of other precious metals is 10%, take 10 kg and put it into the vacuum smelting furnace, vacuumize after sealing the vacuum furnace, control the pressure of the vacuum furnace to 20±5Pa, heat up the vacuum furnace to make the vacuum The temperature of the furnace reaches 300±20°C, and then keeps the temperature constant to volatilize the sulfur in the raw materials. The distillation time is 90 minutes, then lower the temperature and cool down to make the temperature of the vacuum furnace less than 100±10°C, fill the vacuum furnace with nitrogen, and open Vacuum furnace obtained 8.5 kg of elemental sulfur and 1.5 kg of powder enriched in metal sulfides. The volatile amount of the material is 85%, the chemical composition of the obtained sulfur is more than 95%, and the metal content in the powder enriched with metal sulfide is 60%.

Embodiment 3

[0021] The chemical composition of sulfur slag is: 85% S, the content of other precious metals is 15%. Take 20 kg and add it to the vacuum smelting furnace. After sealing the vacuum furnace, vacuum it to make the pressure of the vacuum furnace reach 25±5Pa. The temperature of the vacuum furnace is raised to control the vacuum. The temperature of the furnace is 380±20°C, and then keep the temperature constant to volatilize the sulfur in the raw materials. The distillation time is 120 minutes, then lower the temperature and cool down to make the temperature of the vacuum furnace less than 100±10°C, fill the vacuum furnace with nitrogen, and turn on the vacuum furnace to obtain 18 kg of elemental sulfur and 2 kg of powder enriched in metal sulfides. The volatile amount of the material is 90%, the chemical composition of sulfur is more than 95%, and the metal content in the powder enriched with metal sulfide is 65%. The energy consumption per ton of raw materials is 500 kWh. Ther...

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Abstract

The present invention relates to sulfur slag vacuum volatilizing process for enriching noble metal, and belongs to the field of vacuum fire metallurgy process. Sulfur slag material is distilled in a vacuum smelting furnace at pressure of 10-30 Pa and temperature of 250-400 deg.c for 50-120 min to volatilize sulfur and the sulfur vapor is cooled to form liquid and exhausted from the vacuum smelting furnace, so as to obtain metal sulfide powder with enriched Cu, Ni, Os, Ag, Au, etc. The process is simple, and has high noble metal enriching ratio, no environmental pollution, low power consumption and low production cost.

Description

[0001] 1. Technical field: The present invention relates to a method for vacuum volatilization of sulfur slag to enrich precious metals, which belongs to a vacuum pyrometallurgical method. 2. Background technology: [0002] A kind of sulfur slag is produced in the production process of metal nickel electrolysis and metal sulfide ore pressure leaching. This sulfur slag contains about 50-90% sulfur, about 5% copper, nickel, and iron, and contains osmium, yttrium, ruthenium, and rhodium. , Platinum, palladium, gold, silver and other precious metals are about 1%, and other 40-4%. A factory with an annual output of 100,000 tons of nickel metal produces 300 tons of sulfur slag, worth hundreds of millions of RMB. Osmium, yttrium, ruthenium, rhodium, platinum, palladium, gold, silver and other precious metals are precious metals with high value and are widely used in aerospace, electronics and high-tech new material industries. Under the circumstances that metal resources are gradual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/02C22B15/00C22B23/02
CPCY02P10/20
Inventor 杨斌戴永年刘大春杨部正马文会徐宝强刘永成李伟宏唐万启易蕙华伍继军谢克强韩龙王飞
Owner KUNMING UNIV OF SCI & TECH
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