Method of extracting gold from gold-bearing ores by potassium ferricyanide

A technology for potassium ferricyanide and gold ore, which is applied in the extraction field, can solve the problems of troublesome post-processing, difficulty in recovering gold, low recovery rate and the like, and achieves the effects of low production cost, improved economic benefit and high recovery rate

Inactive Publication Date: 2015-04-01
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a large room for improvement in the leaching speed and leaching rate of this method, especially for gold ores with low gold content, the leaching rate is still low; in addition, the selectivity of this method is poor. It is difficult to recover gold in the liquid, resulting in a low recovery rate of gold and troublesome post-processing problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for extracting gold in gold-bearing ores using potassium ferricyanide, comprising the following steps:

[0021] (1) Grinding: Add 0.36% sodium hexametaphosphate to the gold-bearing concentrate dried to a moisture content of 1.5%, then grind, pass through a 200-mesh sieve, and take the sieve Bottom, obtain ore sand, wherein, described gold-containing ore concentrate weight is 1t, contains gold 31.8g, contains sulfur 432.3kg, contains carbon 19.1kg;

[0022] (2) Roasting pretreatment: take the finely ground ore in step (1), roast it, take out the calcined sand, and grind it evenly after cooling; wherein, the roasting is carried out in three stages, the first stage roasting temperature is 580°C, and the roasting time is 1.5 h; the calcination temperature of the second stage is 380°C, and the calcination time is 2h; the calcination temperature of the third stage is 450°C, and the calcination time is 1h;

[0023] (3) Leaching: Take the calcined sand roasted in step...

Embodiment 2

[0026] A method for extracting gold in gold-bearing ores using potassium ferricyanide, comprising the following steps:

[0027] (1) Grinding: Add 0.2% sodium hexametaphosphate to the gold-bearing concentrate dried to a moisture content of 1.8%, then grind, pass through a 200-mesh sieve, and take the sieve Bottom, obtain ore sand, wherein, described gold-containing ore concentrate weight is 1t, contains gold 31.5g, contains sulfur 431.5kg, contains carbon 20.3kg;

[0028] (2) Roasting pretreatment: Take the finely ground ore in step (1), roast it, take out the calcined sand, and grind it evenly after cooling; among them, the roasting is carried out in three stages, the first stage roasting temperature is 585 °C, and the roasting time is 1h ;The second-stage calcination temperature is 350°C, and the calcination time is 3h; the third-stage calcination temperature is 460°C, and the calcination time is 0.8h;

[0029] (3) Leaching: take the calcined sand roasted in step (2), at roo...

Embodiment 3

[0032] A method for extracting gold in gold-bearing ores using potassium ferricyanide, comprising the following steps:

[0033] (1) Grinding: Add 0.5% sodium hexametaphosphate to the gold-bearing concentrate dried to a moisture content of 1.6%, then grind, pass through a 200-mesh sieve, and take the sieve Bottom, to obtain ore, wherein, the weight of the gold-containing ore concentrate is 1t, containing 32.2g of gold, containing 430.1kg of sulfur, and containing 20.1kg of carbon;

[0034] (2) Roasting pretreatment: Take the finely ground ore in step (1), roast it, take out the calcined sand, and grind it evenly after cooling; wherein, the roasting is carried out in three stages, the first stage roasting temperature is 600°C, and the roasting time is 1.2 h; the calcination temperature of the second stage is 360°C, and the calcination time is 2.5h; the calcination temperature of the third stage is 455°C, and the calcination time is 1h;

[0035] (3) Leaching: take the calcined s...

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Abstract

The invention discloses a method of extracting gold from gold-bearing ores by potassium ferricyanide, and belongs to the field of gold extraction. The method comprises the following steps: grinding, roasting pre-treatment, leaching and gold reduction. According to the method, an appropriate amount of sodium hexametaphosphate is added when the gold-bearing ores are grinded, thus gold can be exposed as far as possible; in addition, a special roasting process is adopted, thus the leaching rate of gold can be obviously increased when leaching is carried out by potassium ferricyanide with a proper concentration; meanwhile, other impurity metals in the leachate are fewer, selectivity for gold leaching is better, the recovery rate of gold is higher, and can achieve more than 97.6% for the ores with a gold content of 30g / t, thus the recovery and utilization rates of the gold ores with low gold contents are obviously increased; meanwhile, the method is high in leaching efficiency, low in production cost, and capable of obviously increasing economic benefits.

Description

technical field [0001] The invention relates to a method for extracting gold, in particular to a method for extracting gold in gold-bearing ores by using potassium ferricyanide. Background technique [0002] At present, about 85% of the gold in the world is extracted by the cyanide method. The traditional cyanide method has the advantages of simple process, convenient operation, good adaptability, low production cost and mature technology. Gold is slow, has poor selectivity, and cyanide is highly toxic, which has serious safety and environmental pollution problems. With the increasingly stringent requirements of environmental pollution control laws and regulations, it is urgent to develop new effective, non-toxic, non-polluting, and more environmentally friendly gold leaching agents to replace cyanide, and improve the refractory gold leaching agent through new process conditions. Gold ore leaching rate. [0003] In recent years, the non-cyanide leaching methods used and st...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22B11/08
Inventor刘菁宋岷蔚俞海平胡子文唐平姚钰钰
OwnerCHENGDU UNIVERSITY OF TECHNOLOGY