Process for extracting gold by modified pressure oxidation-cyaniding

A pressure and process technology, applied in the field of gold extraction process of refractory gold-bearing ores, can solve the problems of complex flue gas treatment and dust collection system, long biological oxidation production cycle, no promotion and production application, etc., to avoid secondary The effect of wrapping and leaching rate improvement and avoiding gold loss

Inactive Publication Date: 2011-07-20
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as countries pay more and more attention to environmental protection requirements, the use of traditional roasting technology to process this part of gold resources will inevitably produce harmful flue gases such as sulfur dioxide, arsenic oxide, and mercury vapor. The flue gas treatment and dust collection system Complex and high investment; at the same time, due to the need for high roasting temperature, some low-melting point oxides contained in the material will cause secondary wrapping of gold during the roasting process, reducing the recovery rate of gold, so its application range is limited; The biological oxidation pretreatment process has been applied rapidly in recent years. Due to the strict requirements of the bacteria species on their living environment, the rea

Method used

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  • Process for extracting gold by modified pressure oxidation-cyaniding
  • Process for extracting gold by modified pressure oxidation-cyaniding
  • Process for extracting gold by modified pressure oxidation-cyaniding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Grinding and grading operations:

[0055] Grind the refractory raw ore until the particle size is -0.045mm and the content is 85%;

[0056] (2) Alkaline pressure oxidation operation:

[0057] Adjust the slurry concentration of step (1) to 40%; add NaOH and mixed agent NaOH and NaOH respectively 2 CO 3 , the pH value of the slurry reaches 13, and it is fed into the pressure oxidation system; under the process conditions of ensuring the temperature of 235 ° C, filling 0.4 MPa partial pressure of oxygen, and oxidation time of 90 minutes, the sulfide minerals are fully oxidized, and the silicon dioxide is decomposed. The encased gold is fully exposed and dissociated. The oxidizing liquid is separated from solid and liquid. After the liquid is treated with lime and barium, the clarified liquid is returned to the oxidation system, and the precipitates are recovered separately. After the oxidized slag is thickened, it enters the next step of cyanidation to extract gold;...

Embodiment 2

[0063] (1) Grinding and grading operations:

[0064] Grind the refractory raw ore until the particle size is -0.045mm and the content is 90%;

[0065] (2) Alkaline pressure oxidation operation:

[0066] Adjust the slurry concentration of step (1) to 40%; add single medicament NaOH and mixed medicament NaOH and NaOH 2 CO 3 , the pH value of the slurry reaches 13, and it is fed into the pressure oxidation system; under the conditions of the guaranteed temperature of 235 ° C, 0.4 MPa partial pressure of oxygen, and the oxidation time of 80 minutes, the sulfide minerals are fully oxidized, and the silica is decomposed. Make the wrapped gold fully exposed and dissociated. The oxidizing liquid is separated from solid and liquid. After the liquid is treated with lime and barium, the clarified liquid is returned to the oxidation system, and the precipitates are recovered separately. After the oxidized slag is thickened, it enters the next step of cyanidation to extract gold;

[00...

Embodiment 3

[0072] (1) Grinding and grading operations:

[0073] Grind the refractory raw ore until the particle size is -0.045mm and the content is 95%;

[0074] (2) Alkaline pressure oxidation operation:

[0075] Adjust the slurry concentration of step (1) to 30%; add single agent NaOH and mixed agent NaOH and NaOH 2 CO 3 , the pH value of the pulp reaches 13, and it is fed into the pressure oxidation system; under the conditions of the guaranteed temperature of 180°C, 0.3MPa partial pressure of oxygen, and the oxidation time of 70min, the sulfide minerals are fully oxidized, and the silica is decomposed. Make the wrapped gold fully exposed and dissociated. The oxidizing liquid is separated from solid and liquid. After the liquid is treated with lime and barium, the clarified liquid is returned to the oxidation system, and the precipitates are recovered separately; after the oxidation slag is thickened, it enters the next step of cyanidation to extract gold;

[0076] (3) Cyanide gol...

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Abstract

The invention discloses a process for extracting gold by modified pressure oxidation-cyaniding. The pressure oxidation technology and alkali silicon dissolving technology are organically combined and a technological scheme of mixed medicament of NaOH and Na2CO3 is adopted to process Carlin dipped-type obstinate gold-containing ore, and the pressure oxidation process is adopted, thus sulphide mineral can be fully oxidized and decomposed and gold wrapped in the ore can be fully exposed and dissociated; under the conditions of higher temperature and higher pressure, NaOH reacts with SiO2 to effectively decompose gangue, thus gold wrapped in the ore is fully exposed and dissociated; wraps of the sulphide mineral and gangue are opened, and harmful elements enter into a liquid phase in a soluble salt form, thus secondary wrapping to gold is avoided; and most harmful substances such as sulphur and arsenic are oxidized and then enter into the liquid phase to be neutralized and recycled. By applying the process disclosed by the invention, the gold leaching rate is improved to 96.5% from 5% of the conventional process, thus the gold leaching rate is obviously improved; and the pollution to the environment is greatly reduced.

Description

technical field [0001] The invention relates to a gold extraction process for refractory gold-bearing ores, in particular to a modified pressure oxidation-cyanidation gold extraction process. Background technique [0002] With the rapid development of the gold industry, the easy-to-handle gold ore resources are decreasing and exhausted, and the difficult-to-handle gold ore resources have become the main raw materials for the gold industry in the future. The rational, efficient and environmentally friendly development of refractory gold resources has become the main technical problem currently faced by all gold-producing countries in the world. The development and utilization of refractory gold resources in foreign advanced countries has accounted for a considerable proportion, while my country is far behind. One of the important reasons is that the development and industrial application of refractory gold ore dressing and smelting technology is relatively low. [0003] The...

Claims

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Application Information

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IPC IPC(8): C22B11/08C22B1/00
CPCY02P10/20
Inventor 姚永南郑晔赵明福
Owner CHANGCHUN GOLD RES INST
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