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A method for suppressing cyanide dissolution of copper minerals in refractory copper-bearing gold ores

A technology for refractory and gold mines, applied in the direction of improving process efficiency, etc., to achieve the effects of improving utilization rate, reducing cyanide consumption, and reducing consumption

Active Publication Date: 2021-01-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, lead oxide is widely used in the manufacture of stabilizers for polyvinyl chloride plastics, high-refractive index optical glass, ceramic enamel, plane abrasives for precision machine tools, electron tubes, picture tubes, and X-ray-proof lead glass agent radiation-proof rubber products. However, in the field of mineral processing, especially for inhibiting the cyanide dissolution of copper minerals in copper-bearing gold ores, there is no report

Method used

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  • A method for suppressing cyanide dissolution of copper minerals in refractory copper-bearing gold ores
  • A method for suppressing cyanide dissolution of copper minerals in refractory copper-bearing gold ores
  • A method for suppressing cyanide dissolution of copper minerals in refractory copper-bearing gold ores

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Effect test

Embodiment 1

[0021] In this embodiment, two single minerals, chalcopyrite and bornite, are treated by the method of the present invention. Grind the above two kinds of copper minerals with a three-head grinder to -200 mesh and account for 100%, respectively take a certain amount of two kinds of copper minerals (the amount of copper metal is 5g), press the liquid-solid ratio 27:1, pH=11.5 , NaCN concentration 5g / L, stirring speed 901r / min, leaching temperature 25°C, leaching time 12h for leaching test. The test results are shown in the table below.

[0022]

[0023]

[0024]

[0025] As can be seen from the above table, the addition of 0.6g / L of lead oxide reduces the leaching rate of chalcopyrite copper from 2.4% when no lead oxide is added to 1.68%, and the leaching rate of bornite copper is reduced from 2.4% when no lead oxide is added. 6.67% was reduced to 2.33%, which indicated that the addition of lead oxide inhibited the dissolution of chalcopyrite and bornite in the cyanid...

Embodiment 2

[0027] In this embodiment, the method of the present invention is used to treat a copper-containing gold concentrate in Lingbao, Henan. The main metal minerals in the copper-bearing gold concentrate are chalcopyrite, sphalerite and pyrite, the main gangue minerals are quartz and muscovite, and the gold and copper grades are 38.97g / t and 2.35% respectively. test attached figure 1 Carried out, the test results are shown in the table below.

[0028] Lead oxide / kg / t Gold leaching slag / g / t Gold leaching rate / % Copper leaching rate / % Sodium cyanide unit consumption / kg / t 0.0 3.94 89.9 33.19 19.28 4.0 2.91 92.53 27.66 15.88

[0029] It can be seen from the above table that the addition of 4.0kg / t of lead oxide reduces the copper leaching rate from 33.19% to 27.66% when no lead oxide is added, and the gold leaching rate increases from 89.90% when no lead oxide is added to 92.53%, and the cyanide consumption is also reduced from 19.28kg / t without ...

Embodiment 3

[0031] In this embodiment, the method of the present invention is used to treat three kinds of copper-containing gold concentrates in Fujian (respectively A mine, B mine and C mine). The metal minerals in these three kinds of copper-bearing gold concentrates are mainly pyrite, with a roughly content of about 40%, followed by chalcopyrite, galena, pyrrhotite, and copper blue and tetrahedrite, sphalerite. Zinc ore and trace lead sulfur salt minerals. The gangue minerals are mainly quartz, with a content of about 35%, followed by sericite (white) mica (about 15-25%), and the rest are chlorite (about 5-10%), kaolinite and calcite, a small amount of feldspar, etc. , There are silver minerals (natural silver and argentite, etc.) when there is obvious presence of carbon. The grades of gold and copper in mine A, mine B and mine C are 115.2g / t, 2.48%, 51.8g / t, 1.89%, 109.2g / t, 0.48%, respectively.

[0032] Routine test conditions: leaching time is 48 hours, leaching sodium cyanide co...

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Abstract

A method for inhibiting cyanidation dissolution of copper minerals in refractory copper-bearing gold ores. Use lead oxide as an inhibitor to interact with copper minerals in the alkaline cyanide system, so that the dissolution of copper minerals in the cyanide system is inhibited, reducing the impact of copper minerals on cyanide and dissolved oxygen in the cyanide system consumption, thereby increasing the effective cyanide concentration and dissolved oxygen concentration that interact with gold to increase the gold cyanide leaching rate and cyanide dissolution rate, while reducing the consumption of cyanide. The invention solves the problems of cyanide consumption, oxygen consumption and passivation of gold surface by copper mineral dissolution in the direct cyanidation process of copper-containing gold ore. Simultaneously, the soaking inhibitor lead oxide used in the present invention has the advantages of low price, direct administration, less consumption, long drug effect and the like.

Description

technical field [0001] The invention belongs to the technical field of gold ore mineral processing, in particular to a method for inhibiting cyanidation and dissolution of copper minerals in refractory copper-containing gold ores. Background technique [0002] With the rapid economic development and continuous mining of gold resources, complex and difficult-to-handle gold resources have become an important raw material for gold production in countries all over the world. According to statistics, more than 60% of the world's gold reserves are difficult-to-handle gold ores. 1 / 3 of the output comes from refractory ores. At present, my country's proven reserves of gold resources are 4634t, of which 30% are refractory gold ore resources. Therefore, the research on refractory gold ore processing technology has attracted attention from all over the world. The high attention of gold-producing countries is also a key issue that most gold mines in my country must face, and is directly r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B11/08
CPCC22B3/04C22B11/08Y02P10/20
Inventor 杨玮宛鹤龙涛张凯曹欢
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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