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Quick hot pressing oxidation pretreatment technology for microgranular sulfide type gold ore

A sulfide-type, hot-pressed oxidation technology, applied in the field of metallurgy, can solve the problems of long production cycle, large changes in gold recovery rate, difficulty in meeting large-scale production, etc., and achieve the effect of reducing residence time and increasing speed

Active Publication Date: 2016-06-08
中国有色桂林矿产地质研究院有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the long production cycle and the different materials, the recovery rate of gold varies greatly (ranging from 60% to 95%) in biological oxidation technology, and it is difficult to meet the needs of large-scale production.
In addition, the inhibitory effect on the "robbing gold" activity of carbonaceous substances is weak
The chemical oxidation method is to oxidize by adding chemical reagents, but usually the consumption of chemical reagents is high, resulting in relatively high production costs and serious environmental pollution

Method used

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  • Quick hot pressing oxidation pretreatment technology for microgranular sulfide type gold ore

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Use microfine particle dissemination type high-sulfur gold ore, the gold grade of the ore is 2.95 g / t, carbon content 1.5%, sulfur 6.3%, arsenic 0.37%, ore crushed to 70% through -200 mesh, and then respectively adopt Direct traditional cyanidation gold leaching, ordinary thermal oxygen oxidation pretreatment followed by cyanidation gold leaching, and process treatment of the present invention followed by cyanidation gold leaching for gold extraction.

[0022] Direct cyanidation gold leaching: add 200 grams of broken ore samples, add water, adjust pH = 10.5, and make a pulp with a mass concentration of 25%, add sodium cyanide at an amount of 3 g / liter of pulp, and use the existing Conventional roller bottle technology leaching gold, leaching 24 hours, the leaching rate of gold is 1.36%.

[0023] Ordinary thermal oxygen oxidation treatment followed by cyanidation gold leaching: add 210 grams of broken ore samples into water to make a slurry with a mass concent...

Embodiment 2

[0025] Example 2: Use the fine-grained disseminated high-sulfur gold ore, the gold grade of the ore is 2.95 g / t, the carbon content is 1.5%, the sulfur is 6.3%, and the arsenic is 0.37%. The ore is crushed to 70% and passes -200 mesh, and then respectively Direct traditional cyanidation gold leaching, ordinary hot-pressed oxidation pretreatment followed by cyanidation gold leaching, and process treatment of the present invention followed by cyanidation gold leaching for gold extraction.

[0026]Direct cyanidation gold leaching: add 200 grams of broken ore samples, add water, adjust pH = 11, and make a slurry with a mass concentration of 25% of the slurry, add sodium cyanide at an amount of 3 g / liter of slurry, and use the existing Conventional roller bottle technology leaching gold, leaching 24 hours, the leaching rate of gold is 1.36%.

[0027] Ordinary hot-press oxidation pretreatment process: add 210 grams of crushed ore samples into water to make a pulp with a mass concent...

Embodiment 3

[0029] Embodiment 3: use Carlin type gold concentrate, the gold grade of ore is 18 grams / ton, carbon-containing 6.5%, sulfur 26%, arsenic 2.31%, adopt common thermal oxygen oxidation pretreatment then cyanide leaching gold again respectively, And process treatment of the present invention carries out gold extraction again by cyanide immersion gold.

[0030] Ordinary hot-pressed oxidation treatment followed by cyanidation gold leaching: add 500 grams of broken ore samples into water to make a slurry with a mass concentration of 25%, adjust the pH of the slurry to 1.5, add it to the GSH-5 pressure reaction kettle, and pour it into the kettle An oxygen-containing atmosphere was passed inside, the temperature in the kettle was controlled at 220°C, the total pressure was 3.0 MPa (oxygen partial pressure 0.7 MPa), the stirring speed was 500 rpm, and the oxidation treatment was carried out for 3 hours. Filter the oxidized pulp to obtain oxidized slag, and dry the oxidized pulp in an ...

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Abstract

The invention discloses a quick hot pressing oxidation pretreatment technology for a microgranular sulfide type gold ore. The quick hot pressing oxidation pretreatment technology comprises the specific steps of enabling the microgranular sulfide type gold ore to be formed into ore pulp, and regulating the pH value of the ore pulp to be less than or equal to 4.0; placing the obtained ore pulp in a hot pressing reaction kettle, enabling oxygen-containing atmosphere to be inlet into the reaction kettle, controlling the partial pressure of oxygen to be 0.01-3MPa, rising the temperature to 120-250 DEG C, enabling liquid in the kettle to generate bubbles under a stirring condition, performing oxidation treatment under the stirring condition so as to form oxidized ore pulp, and controlling the time of the oxidation treatment to be longer than or equal to 2 minutes; and performing solid-liquid separation on the obtained oxidized ore pulp so as to obtain oxidation slags and oxidation liquid, and extracting gold from the obtained oxidation slag by an existing conventional cyanidation gold-leaching technology. The technology disclosed by the invention is short in time consumption, and when the gold is extracted from the oxidation slags processed by the pretreatment technology by using a conventional cyanidation gold-leaching technology, the gold leaching and recovering rate is 89% or above.

Description

technical field [0001] The invention relates to a rapid hot-pressing oxidation pretreatment process for fine-grained sulfide-type gold ore, and belongs to the technical field of metallurgy. Background technique [0002] In my country's independent gold mines, fine-grained sulfide-type gold resources account for a relatively large proportion, and such resources account for about one third of the more than 5,000 tons of gold reserves that have been identified. The gold particles of this kind of ore are fine, and exist in the sulfide minerals in the form of dissemination or encapsulation. General mechanical grinding cannot completely open this encapsulation, and the direct cyanide leaching rate of gold is low, generally lower than 10%. [0003] At present, oxidation pretreatment is required for such refractory sulfide ores to release the encapsulated fine particles of gold to improve the recovery rate of gold. Oxidation pretreatment technology of sulfide gold ore mainly includ...

Claims

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Application Information

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IPC IPC(8): C22B11/00
CPCC22B11/00
Inventor 冯吉福周卫宁李尽善袁江涛罗星马荣锴
Owner 中国有色桂林矿产地质研究院有限公司
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