Method for treating difficult-to-treat gold concentrates by ozone oxidization and microbial oxidation

A technology for ozone oxidation and refractory gold, which is applied in the direction of improving process efficiency, can solve the problems of gold leaching rate decrease, leaching time shortening, environmental pollution, etc., and achieve the effect of increasing leaching rate and reducing the cost of reagents and equipment

Active Publication Date: 2019-01-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this process is that it has strong adaptability, and the disadvantage is that it produces SO during roasting. 2 、As 2 o 3 It will seriously pollute the environment, and the pressure on environmental protection is high. Moreover, the process is sensitive to changes in operating parameters and feed ingredients, which can easily cause over-burning or under-burning, resulting in a decrease in gold leaching rate.
The principle of the hot-pressed oxidation pretreatment process is to use pressure to accelerate the chemical reaction rate of the oxidation process. Its advantage is that the whole process is completely wet and does not cause smoke pollution. After oxidation, pyrite and arsenopyrite dissolve in the solution, and gold The recovery rate is high; the disadvantage is that the equipment design and material requirements are high, and there are requirements for production scale
Microbial oxidation pretreatment uses the iron and sulfur oxidase system in microorganisms to oxidize and decompose pyrite and arsenopyrite. Its advantages are simple process, low equipment cost investment, and environmental protection. limited tolerance
[0004] To sum up, th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for the combined treatment of refractory gold concentrates using ozone oxidation and microbial oxidation of the present invention is applied to a refractory gold concentrate in Xinjiang. The contents of iron, arsenic, sulfur and gold in the gold concentrate are 23.68%, 3.25%, 24.53%, the content of Au is 55.52g / t, and the gold concentrate is crushed into a particle size of -0.044mm>90% ore powder for gold extraction experiment, including the following steps:

[0029] (1) Fully mix 50g of a certain gold concentrate with 500mL of deionized water, and add alkali to the obtained pulp solution to adjust the pH to 10;

[0030] (2) Ozone is passed into the above solution at a flow rate of 10g / h for oxidation reaction. The oxidation reaction lasts for 1 hour, the reaction temperature is 30°C, and the stirring speed is 300rpm. After the gold concentrate obtained after the treatment is aerated for 2 hours Inoculation of microorganisms;

[0031](3) Then add the solid com...

Embodiment 2

[0035] A method of the present invention for combined treatment of refractory gold concentrates using ozone oxidation and microbial oxidation is applied to a refractory gold concentrate in Pingjiang, Yueyang, Hunan. The contents of iron, arsenic, sulfur and gold in the gold concentrate are 32.98%, 22.81% %, 31.13%, the content of Au is 33.03g / t. The gold concentrate is crushed into a particle size of -0.044mm>90% ore powder for gold extraction experiment, including the following steps:

[0036] (1) 50g of a gold concentrate is fully mixed with 500mL of deionized water to obtain a slurry solution;

[0037] (2) Then add the solid content of 9K medium to the pulp, control the pH to be about 2, inoculate Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, so that the concentration of microorganisms in the pulp is 5g / L, for biological pre-oxidation, the reaction time is 10d, the stirring speed is 170rpm, and the reaction temperature is 30°C;

[0038] (3) Pass the or...

Embodiment 3

[0042] A method of the present invention for combined treatment of refractory gold concentrates using ozone oxidation and microbial oxidation is applied to a refractory pyrite ore in Pingjiang, Yueyang, Hunan. The contents of iron, arsenic, sulfur and gold in the gold concentrate are 33.48%, 25.85% %, 29.16%, the content of Au is 21.06g / t. The gold concentrate is crushed into a particle size of -0.044mm>90% ore powder for gold extraction experiment, including the following steps:

[0043] (1) Fully mix 50g of a certain gold concentrate with 500mL of deionized water to obtain a slurry solution;

[0044] (2) Then add the solid content of 9K medium to the pulp, control the pH to be about 2, inoculate Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, so that the concentration of microorganisms in the pulp is 5g / L, for biological pre-oxidation, the reaction time is 10d, the stirring speed is 170rpm, and the reaction temperature is 30°C;

[0045] (3) Pass the ore p...

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PUM

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Abstract

The invention discloses a method for treating difficult-to-treat gold concentrates by ozone oxidization and microbial oxidation. The method comprises the following steps of (1) crushing difficult-to-treat gold concentrates into ore powder; then, making ore powder into ore slurry; (2) introducing ozone for ozone oxidization reaction; then, inoculating microbes in the ore slurry to perform microbialoxidation reaction; or inoculating the microbes in the prepared ore slurry to perform microbial oxidization reduction reaction; then, introducing ozone for ozone oxidization reaction; (3) performingsolid-liquid separation on the ore slurry obtained after the reaction; after the filtering, feeding the obtained ore slag into a gold extraction stage for gold extraction. The method provided by the invention has the advantages that the ozone oxidization treatment is combined with the microbial oxidization treatment; iron pyrites and arsenopyrite in the gold concentrates are oxidized; elemental cabin is passivated; finally, gold extraction agents such as thiourea are used for gold extraction; the gold leaching rate is greatly improved; the leaching period is shortened; the reagent cost and theequipment cost can also be greatly reduced.

Description

technical field [0001] The invention relates to a pretreatment process of refractory gold concentrate, in particular to a method for jointly treating refractory gold concentrate by utilizing ozone oxidation and microbial oxidation. Background technique [0002] With the continuous development of mineral resources, the refractory gold ore resources are decreasing day by day, and the proportion of refractory gold ore in production is increasing. According to statistics, the gold reserves in refractory gold mines in the world account for 60% of the total gold reserves. At present, about one-third of the world's total output comes from refractory gold mines. Among my country's proven gold reserves, 30% are refractory gold reserves. Dealing with gold mines is of great significance to the development and utilization of such gold mine resources. [0003] Refractory gold ores are characterized by high arsenic, high sulfur, and carbon content, or gold is wrapped in gangue minerals an...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00
CPCC22B3/18C22B11/04Y02P10/20
Inventor 谢建平肖勇刘新星邱冠周武海艳
Owner CENT SOUTH UNIV
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