Gold concentrate oxidizing slag gold leaching process

A gold concentrate and oxidation slag technology, applied in the direction of improving process efficiency, etc., to achieve high gold leaching rate, low cost, and simple treatment

Pending Publication Date: 2022-01-28
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is the problem of the existing gold leaching process, thereby providing a gold concentrate oxidation slag gold leaching process

Method used

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  • Gold concentrate oxidizing slag gold leaching process
  • Gold concentrate oxidizing slag gold leaching process
  • Gold concentrate oxidizing slag gold leaching process

Examples

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Effect test

Embodiment 1

[0027] This embodiment provides a process for leaching gold from oxidized slag of gold concentrate. After oxidation of high-sulfur arsenic gold concentrate in a certain area of ​​Jiangxi, this process is used for non-cyanide gold leaching. The specific steps are as follows:

[0028] (1) Take 100g of gold concentrate oxidation slag, add leaching solution 280ml and activated carbon, add water 20ml, use sodium hydroxide to adjust the pH value to 10, add an appropriate amount of ammonium thiocyanate solid, control the mass fraction of ammonium thiocyanate to 15% of the leaching solution , stirring and leaching at normal temperature and pressure for 7 hours, after the leaching is completed, take out the gold-loaded carbon, test its gold content, weigh the weight of the leaching residue, and calculate the leaching rate.

[0029] (2) Add 10ml of water to the leached pulp obtained in step (1), add an appropriate amount of ammonium thiocyanate solid, control the mass fraction of ammoniu...

Embodiment 2

[0036] This embodiment provides a process for leaching gold from oxidized slag of gold concentrate. After oxidation of high-sulfur arsenic gold concentrate in a certain area of ​​Jiangxi, this process is used for non-cyanide gold leaching. The specific steps are as follows:

[0037] (1) Get 100g of gold concentrate oxidation slag, add leaching solution 280ml and activated carbon, add water 20ml, use calcium oxide to adjust the pH value to 12, add an appropriate amount of ammonium thiocyanate solid, control the ammonium thiocyanate mass fraction to be 10% of the leaching solution, Stir and leaching at normal temperature and pressure for 4 hours, take out the gold-loaded carbon after the leaching is completed, test its gold content, weigh the weight of the leaching residue, and calculate the leaching rate.

[0038] (2) Add 10ml of water to the leach pulp obtained in step (1), add an appropriate amount of ammonium thiocyanate solid, control the mass fraction of ammonium thiocyanat...

Embodiment 3

[0044] This embodiment provides a process for leaching gold from oxidation slag of gold concentrate. After oxidation of high-sulfur arsenic gold concentrate in a certain area in Hunan, this process is used for non-cyanide gold leaching. The specific steps are as follows:

[0045] (1) Get 100g of gold concentrate oxidation slag, add leaching solution 280ml and activated carbon, add water 20ml, use calcium oxide to adjust the pH value to 11, add an appropriate amount of ammonium thiocyanate solid, control the ammonium thiocyanate mass fraction to be 5% of the leaching solution, Stir and leaching at normal temperature and pressure for 5 hours. After the leaching is completed, take out the gold-loaded carbon, test its gold content, weigh the weight of the leaching residue, and calculate the leaching rate.

[0046] (2) Add 10ml of water to the leach pulp obtained in step (1), add an appropriate amount of ammonium thiocyanate solid, control the mass fraction of ammonium thiocyanate t...

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Abstract

The invention discloses a gold concentrate oxidizing slag gold leaching process, which comprises the following steps: firstly, leaching the gold concentrate oxidizing slag for the first time by using a leachate and activated carbon to obtain gold-loaded carbon and mixed ore pulp; then supplementing activated carbon and the leachate into the mixed ore pulp, adjusting the pH value, and then carrying out secondary leaching to obtain a leaching solution, gold-loaded carbon and tailings; finally, recycling the leaching solution for continuous leaching; wherein the leachate is ammonium thiocyanate. The process is used for the high-arsenic sulfur gold concentrate with the arsenic content exceeding 15%, the leaching rate is 95% or above, other energy consumption is avoided, the leaching condition is simple, and the industrial realizability is high; the leaching solution is recycled and re-leached, so that the dosage of chemicals and water is saved, and meanwhile, the two-stage leaching ensures that the gold leaching rate is high and the index is stable; ammonium thiocyanate is adopted as the leachate, the leachate is easy to obtain, low in cost, safe and non-toxic, the gold leaching speed is high, the leaching period is short, leaching waste liquid and waste residues are easy to treat, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of gold extraction, in particular to a process for leaching gold from oxidation slag of gold concentrate. Background technique [0002] With the continuous mining of gold resources for hundreds of years, the easy-to-mining and easy-processing gold resources are gradually exhausted, and gold production is facing the technical breakthrough of mainly extracting gold from refractory gold ores. Refractory gold ores can be divided into complex polymetallic sulfide ores, carbonaceous gold ores and antimony-gold ores from the perspective of process mineralogy. The first type of refractory gold ore accounts for the majority of my country's refractory gold ore resources and reserves. The gold particles in this type of gold ore are fine and wrapped by pyrite, arsenopyrite and other minerals. Even if they are finely ground, the wrapped gold cannot be opened, and Substances such as arsenic and sulfur will react with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/14
CPCC22B11/04C22B3/14Y02P10/20
Inventor 黄万抚黄彪林黄李金鸿李新冬王泽凯曾超聪肖权黄家驹
Owner JIANGXI UNIV OF SCI & TECH
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