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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AI-Extracted 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 ...

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.

Technology Topic

SlagGold ore +5

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Examples

Experimental program(10)

Example Embodiment

[0021] Example 1: Using fine-grained high-sulfur gold ore, the gold grade of the ore is 2.95 g/ton, carbon content 1.5%, sulfur 6.3%, and arsenic 0.37%. The ore is crushed to 70% through -200 mesh, and then used separately Directly traditional cyanide leaching gold, ordinary thermal oxygen oxidation pretreatment and then cyanide leaching gold, and the process of the present invention and then cyanide leaching gold for gold extraction.

[0022] Direct cyanide leaching of gold: 200 grams of crushed ore sample, add water, adjust pH=10.5, and make a slurry with a slurry mass concentration of 25%, add sodium cyanide at the addition amount of 3 g/l of slurry, using existing Conventional roller bottle technology leaching gold, leaching for 24 hours, the gold leaching rate is 1.36%.

[0023] Ordinary thermal oxygen oxidation treatment and cyanide gold leaching: 210 grams of broken ore sample, add water to make a slurry with a mass concentration of 25%, adjust the pH of the slurry to 2.5, add it to the GSH-1 pressure reactor, and add it to the kettle An oxygen-containing atmosphere is introduced, the temperature in the kettle is controlled to 220°C, the total pressure is 3.0 MPa (oxygen partial pressure is 0.7 MPa), the stirring speed is 800 rpm, and the oxidation treatment is 3 hours. The oxidized pulp is filtered to obtain an oxidized slag, which is dried in an oven at 50°C for 24 hours. Take 200 grams of dried oxide slag, add water, adjust pH=10.5, and prepare a slurry with a mass concentration of 25%. Add sodium cyanide at the amount of 3 grams/liter of slurry, and use existing conventional roller bottle technology to immerse gold After leaching for 24 hours, the gold leaching rate was 88.5%.

[0024] The process of the present invention treats and then cyanide gold leaching: 210 grams of broken ore sample, add water to prepare a slurry with a mass concentration of 25%, adjust the pH of the slurry to 2.5, add it to the GSH-1 pressure reaction kettle, and add it to the kettle Introduce an oxygen-containing atmosphere, control the temperature in the kettle to 220°C, the total pressure of 3.0 MPa (oxygen partial pressure 0.7 MPa), the stirring speed of 500 rpm, and add the foaming agent (hexadecyl trimethyl ammonium bromide), Control the concentration of the foaming agent in the slurry to 100 ppm, make the liquid in the kettle generate bubbles, and maintain the above conditions for oxidation treatment for 1 hour. The oxidized pulp is filtered to obtain an oxidized slag, which is dried in an oven at 50°C for 24 hours. Take 200 grams of dried oxide slag, add water, adjust pH=10.5, and prepare a slurry with a mass concentration of 25%. Add sodium cyanide at the amount of 3 grams/liter of slurry, and use existing conventional roller bottle technology to immerse gold After leaching for 24 hours, the leaching rate of gold was 95.9%.

Example Embodiment

[0025] Example 2: Using fine-grained high-sulfur gold ore, the gold grade of the ore is 2.95 g/ton, carbon content 1.5%, sulfur 6.3%, and arsenic 0.37%. The ore is crushed to 70% through -200 mesh, and then used separately Directly traditional cyanide leaching gold, ordinary hot-press oxidation pretreatment and then cyanide leaching gold, and the process of the invention and then cyanide leaching gold for gold extraction.

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

[0027] Ordinary hot-press oxidation pretreatment process: 210 grams of broken ore sample, add water to make a slurry with a mass concentration of 25%, adjust the pH of the slurry to 2.5, add it to the GSH-1 pressure reaction kettle, and pass it into the kettle In an oxygen-containing atmosphere, the temperature in the kettle is controlled to 220°C, the total pressure is 3.0 MPa (oxygen partial pressure is 0.7 MPa), the stirring speed is 800 rpm, and the treatment is for 2.5 hours. The obtained oxidized slag is made into a slurry with a mass concentration of 25%. Sodium cyanide is added in an amount of 3 g/L of the slurry. The existing conventional roller bottle technology is used to leaching gold. The leaching rate is 82.5%. .

[0028] The process of the present invention treats and then cyanide gold leaching: 210 grams of broken ore sample, add water to prepare a slurry with a mass concentration of 25%, adjust the pH of the slurry to 2.5, add it to the GSH-1 pressure reaction kettle, and add it to the kettle Introduce an oxygen-containing atmosphere, control the temperature in the kettle to 220°C, the total pressure of 3.0 MPa (oxygen partial pressure 0.7 MPa), and the stirring speed of 800 rpm. Add a foaming agent (sodium lauryl ether sodium sulfate) to control The concentration of foaming agent in the ore slurry is 300 ppm, so that the liquid in the kettle generates bubbles, and the above conditions are maintained for oxidation treatment for 1 hour. The oxidized pulp is filtered to obtain an oxidized slag, which is dried in an oven at 50°C for 24 hours. Take 200 grams of dried oxidation residue, add water, adjust pH=11, and make a slurry with a mass concentration of 25%. Add sodium cyanide at the amount of 3 grams/liter of slurry, and use existing conventional roller bottle technology to immerse gold After leaching for 24 hours, the gold leaching rate was 93.8%.

Example Embodiment

[0029] Example 3: Carlin-type gold concentrate is used. The gold grade of the ore is 18 g/ton, carbon content 6.5%, sulfur 26%, and arsenic 2.31%. Then they are pretreated by ordinary thermal oxygen oxidation and then cyanide leaching gold. And the process of the present invention is followed by cyanide leaching for gold extraction.

[0030] Ordinary hot-press oxidation treatment and then cyanide gold leaching: 500 grams of crushed ore sample, add 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 reactor, and add it to the kettle An oxygen-containing atmosphere is introduced into the kettle, the temperature in the kettle is controlled to 220°C, the total pressure is 3.0 MPa (the oxygen partial pressure is 0.7 MPa), the stirring speed is 500 rpm, and the oxidation treatment is 3 hours. The oxidized pulp is filtered to obtain an oxidized slag, which is dried in an oven at 50°C for 24 hours. Take 200 grams of dried oxide slag, add water, adjust pH=11.5, and make a slurry with a mass concentration of 25%. Add sodium cyanide at the amount of 3 grams/liter of slurry, and use the existing conventional roller bottle technology to immerse gold After leaching for 24 hours, the gold leaching rate was 88.5%.

[0031] The process of the present invention processes and re-cyanide gold leaching: 500 grams of mineral sample, add water to prepare 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 pass it into the kettle Oxygen-containing atmosphere, control the temperature in the kettle to 195℃, total pressure 2.0MPa (oxygen partial pressure 0.6MPa), stirring speed 500 rpm, add foaming agent (sodium oleate), control the concentration of foaming agent in the slurry It is 200 ppm to generate bubbles in the liquid in the kettle and keep the above conditions for 15 minutes of oxidation treatment. The oxidized pulp is filtered to obtain an oxidized slag, which is dried in an oven at 50°C for 24 hours. Take 200 grams of dried oxide slag, add water, adjust pH=11.5, and make a slurry with a mass concentration of 25%. Add sodium cyanide at the amount of 3 grams/liter of slurry, and use the existing conventional roller bottle technology to immerse gold After leaching for 24 hours, the gold leaching rate was 89.7%.

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Owner:SHANGHAI ALLYNAV TECH CO LTD

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Owner:深圳市微航磁电技术有限公司

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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