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Lead-free smelting process for leaded gold concentrate obtained through Knelson concentration

A technology of gold concentrate and leadization, which is applied in the field of lead-free smelting process of lead-containing gold concentrate by Nielsen gravity, can solve the problems of no better technology, large error in ore composition analysis, sample segregation, etc., and achieve Ease of popularization, low production cost, and simple process equipment

Active Publication Date: 2015-07-22
JILIN JIEN NICKEL IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most enterprises adopt the method of selling medium ore, but due to sample segregation caused by large particles of gold, the analysis error of ore composition is large, resulting in a serious underestimation of the value
To this end, many scientific research institutions have carried out applied research in this area, but none of them has developed a better process technology.

Method used

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  • Lead-free smelting process for leaded gold concentrate obtained through Knelson concentration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A non-pollution smelting process of Nielsen gravity-selected lead-containing gold concentrate, comprising the following steps:

[0044] Step 1. Add 50 kilograms of lead-containing middling ore in Nielsen gravity separation containing 40,000 grams / ton of gold into a polytetrafluoroethylene-lined reactor with a capacity of 1.5 cubic meters, and inject 1,000 liters of concentrated hydrochloric acid with a concentration of 6mol / L. The liquid-solid ratio (ml / g) of a hydrochloric acid leaching is about 20:1, heating and stirring for 2 hours, and the leaching temperature is 98°C;

[0045] Step 2. Inject the mixture after leaching in step 1 into a polypropylene vacuum filter while it is hot and filter under negative pressure to obtain leaching residue and primary leaching solution. Deionized water is directly filtered and rinsed, the temperature of deionized water is 90°C, and the water consumption is 1250 liters. After the washing is completed, washing water and lead removal l...

Embodiment 2

[0055] A non-pollution smelting process of Nielsen gravity-selected lead-containing gold concentrate, comprising the following steps:

[0056] Step 1, adding 10 kilograms of Nielsen's gravity-selected lead-containing gravity-selected concentrate containing 100,000 grams / ton of gold in 200 liters of glass reactors, injecting concentration is 200 liters of concentrated hydrochloric acid of 12mol / L, and the liquid-solid ratio of a hydrochloric acid leaching ( ml / g) is about 20:1, heated and stirred for leaching for 0.5 hours, and the leaching temperature is 95°C;

[0057] Step 2. Inject the mixture after leaching in step 1 into a ceramic filter while it is hot and filter under negative pressure to obtain leaching slag, primary leaching solution, and inject the primary leaching solution into the enamel crystallization reactor. The leaching residue in the form of filter cake is deionized with hot The water is directly filtered and rinsed. The deionized water temperature is 92°C and...

Embodiment 3

[0067] A non-pollution smelting process of Nielsen gravity-selected lead-containing gold concentrate, comprising the following steps:

[0068] Step 1. Add 50 kg of Nelson gravity-selected lead-containing gravity-selected concentrate containing 80,000 grams / ton of gold into an enamel reaction kettle with a capacity of 1.5 cubic meters, and inject 1,200 liters of concentrated hydrochloric acid with a concentration of 8mol / L. The liquid-solid ratio (ml / g) is about 24:1, heated and stirred for 1 hour, and the leaching temperature is 96°C;

[0069] Step 2. Inject the mixture after leaching in step 1 into a belt filter while it is hot and filter under negative pressure to obtain leaching residue, primary leaching solution, and inject the primary leaching solution into the enamel crystallization reactor. The leaching residue in the form of filter cake is removed with hot water Ionized water is directly filtered and rinsed. The temperature of deionized water is 95°C, and the water con...

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Abstract

The invention relates to a lead-free smelting process for leaded gold concentrate obtained through Knelson concentration and belongs to the field of gold smelting. The lead-free smelting process comprises the following steps: leaded gold concentrate obtained through Knelson concentration is subjected to primary hydrochloric acid leaching and negative-pressure filtering to obtain leaching residues and a primary leaching solution; the leaching residues are filtered and washed to obtain lead-removed leaching residues, the primary leaching solution is subjected to cooling crystallization and negative-pressure filtering in a crystallization reaction kettle to obtain lead chloride crystals and leaching filtrate, and the leaching filtrate is subjected to copper powder replacement to obtain silver-bearing copper powder and filtrate after replacement; the lead-removed leaching residues are placed into a roasting furnace, roasted and subjected to secondary hydrochloric acid leaching and negative-pressure filtering to obtain a secondary leaching solution and lead-free enrichment residues mainly containing gold and silver, and the lead-free enrichment residues enter a silver separating and smelting system for gold and silver recovery. Compared with the prior art, the lead-free smelting process has the characteristics of high gold and silver enrichment efficiency, pollution prevention, simple process equipment, low production cost and easiness in popularization.

Description

technical field [0001] The invention relates to a gold smelting process, in particular to a lead-free smelting process of Nielsen gravity-selected lead-containing gold concentrate. Background technique [0002] Many gold mining enterprises have adopted Nelson concentrators for gold beneficiation process production, and high-grade gold concentrates and low-grade tailings can be obtained through Nelson gravity separation. Gold concentrates generally use pyrometallurgy to remove impurities such as lead to enrich gold and silver. However, since the generation of lead vapor cannot be fundamentally removed, it will cause environmental pollution and damage to the health of operators. Although the enrichment effect of the amalgamation process is better, due to the mercury pollution, the country has explicitly banned the use of this process for production. The cyanidation process commonly used in the wet process will also cause cyanide pollution, endangering the environment and pers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
CPCY02P10/20
Inventor 李韧李京郑沈吉许卫军赵立智袁凤艳孟庆伟刘力勇马忠诚赵孟珊张春生王学哲刘丹丹池丕华商雅文
Owner JILIN JIEN NICKEL IND
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