Modified lime sulphur and application thereof in gold leaching technology

A lime-sulfur mixture and modification technology, applied in the direction of improving the process efficiency, can solve the problems of the adaptability of easily oxidized and decomposed ore, the process flow is not perfect, the consumption of chemicals is large, etc. The effect of low damage and high recovery rate

Active Publication Date: 2013-08-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods all have certain deficiencies, some technological processes are not perfect enough, and some have large consumption of chemicals, high cost, and low recovery rate; some are easy to be oxidized and decomposed because of unstable chemicals; Poor performance, etc. cannot be applied on an industrial scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At room temperature, take 1 part of the original lime sulfur mixture, grind it into powder, make its particle size less than or equal to 2mm, add 0.05 part of sodium hexametaphosphate, 0.375 part of calcium peroxide, 0.05 part of potassium ferricyanate, 0.01 part of lead nitrate and 0.25 part of sodium bromide are mixed uniformly to obtain a modified lime sulfur mixture (the above parts are calculated by mass ratio). Water is added to the obtained modified lime-sulfur agent to prepare a modified lime-sulfur agent leaching solution. Make the massfraction of the original stone sulfur in the modified lime sulfur leachate in the modified lime sulfur be 0.4%, the mass percentage of sodium hexametaphosphate in the modified lime sulfur leach is 0.02%, calcium peroxide is in the modified lime sulfur leachate The mass percentage in the modified lime sulfur leach solution is 0.15%, the mass percentage of potassium ferricyanate in the modified lime sulfur leach solution is 0.02%, ...

Embodiment 2

[0027] At room temperature, take 1 part of the original lime sulfur mixture, grind it into powder, make its particle size less than or equal to 2mm, add 0.0438 part of sodium hexametaphosphate, 0.4375 part of calcium peroxide, 0.1 part of potassium ferricyanate, Mix 0.0375 parts of lead nitrate and 0.3125 parts of potassium bromide evenly to obtain a modified lime-sulfur mixture (the above-mentioned parts are calculated by mass ratio); add water to the obtained modified lime-sulfur mixture to prepare a modified lime-sulfur mixture leaching solution. In the modified lime sulfur leach solution, the mass fraction of the original stone sulfur in the modified lime sulfur leach is 0.8%, the mass fraction of sodium hexametaphosphate in the modified lime sulfur leach is 0.035%, and the calcium peroxide in the modified lime sulfur leach is 0.035%. The mass fraction in the lime sulfur leach solution is 0.35%, the mass fraction of potassium ferricyanate in the modified lime sulfur leach s...

Embodiment 3

[0029]At room temperature, take 1 part of the original lime sulfur mixture, grind it into powder, make its particle size less than or equal to 2mm, add 0.25 part of sodium hexametaphosphate, 0.4 part of calcium peroxide, 0.3 part of potassium ferricyanate, Mix 0.1 part of lead nitrate and 0.4 part of calcium bromide evenly to obtain a modified lime-sulfur mixture (the above-mentioned parts are calculated by mass ratio); add water to the obtained modified lime-sulfur mixture to prepare a modified lime-sulfur mixture leaching solution. Make the mass fraction of the original stone sulfur in the modified lime sulfur leachate in the modified lime sulfur 10%, the mass fraction of sodium hexametaphosphate in the modified lime sulfur leach is 2.5%, calcium peroxide in the modified lime The mass fraction in the leach solution of the sulfur compound is 4%, the mass fraction of potassium ferricyanate in the leach solution of the modified lime sulfur compound is 3%, the mass fraction of le...

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Abstract

The invention discloses a modified lime sulphur and an application thereof in a gold leaching technology. The modified lime sulphur comprises a stabilizer sodium-hexametaphosphate, oxidants-calcium peroxide and potassium cyanate, and additives-lead nitrate and soluble bromides (such as sodium bromide, potassium bromide, calcium bromide and the like). The modified lime sulphur is used as a gold leaching agent so as to effectively recover gold from gold-containing ores, gold concentrate powder and gold-containing wastes. The modified lime sulphur has the characteristics that the modified lime sulphur is easy to synthesize; the preparation cost is low; the preparation process is environment-friendly and toxic-free; and when the prepared modified lime sulphur is used for gold leaching, the gold leaching technology is simple, and the gold leaching velocity is high; and moreover, the modified lime sulphur is suitable for more ores than cyaniding gold leaching.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a modified lime sulfur mixture and its application in a gold leaching process. The invention relates to an efficient gold leaching system composed of a stabilizer, an oxidizing agent and a synergist, and an efficient gold recovery method for extracting gold from gold-bearing ores, gold fine powder and gold-bearing waste using the system. Background technique [0002] Today, the industry basically uses the classic cyanidation method to extract gold from gold ore, gold concentrate and gold-bearing waste. Although the extraction of gold by cyanide is a relatively mature process, it requires the use of highly toxic cyanide; and the cyanide slag, cyanide residue and other wastes generated during the gold extraction process have caused serious environmental problems. Pollution, if the operation is not careful, it is easy to cause personal poisoning. In addition, the diss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C22B3/16
CPCY02P10/20
Inventor 刘有才符剑刚朱忠泗林清泉李丽峰
Owner CENT SOUTH UNIV
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