Gold recovery technology for processing arsenious S-C gangue coated gold concentrate by microwave fluidized roasting

A technology of boiling roasting and wrapping gold, applied in the direction of improving process efficiency, can solve the problems of high equipment requirements, harsh production conditions, and high maintenance costs, and achieve the effects of reducing energy consumption, promoting monomer dissociation, and improving recovery rate.

Inactive Publication Date: 2011-11-23
广西地博矿业集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) Arsenic sulfide will decompose and consume oxygen and cyanide in the pulp to reduce the dissolution rate of gold, and the products generated by decomposition in the alkaline pulp are all in contact with the surface of gold, forming a thin film on the surface of gold particles, hindering the dissolution of gold , the interaction of oxygen and cyanide;
However, these processes have problems such as high equipment requirements, harsh production conditions, high maintenance costs, poor applicability, etc., and cannot eliminate the robbery of gold charcoal and open the gangue wrapped in gold, so the gold extraction rate is not high

Method used

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  • Gold recovery technology for processing arsenious S-C gangue coated gold concentrate by microwave fluidized roasting
  • Gold recovery technology for processing arsenious S-C gangue coated gold concentrate by microwave fluidized roasting
  • Gold recovery technology for processing arsenious S-C gangue coated gold concentrate by microwave fluidized roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of ore pulp: the arsenic, sulfur, carbon, and gangue-containing gold concentrate with a particle size of less than 200 meshes accounting for 60% is rationally blended to make a slurry with a liquid-solid weight ratio of 1:2.5. In the preparation of the ore pulp Add sodium carbonate according to 20kg / t gold concentrate, fully stir for 4 hours;

[0027] (2) Preliminary microwave boiling roasting: pump the slurry obtained in step (1) into the preliminary microwave boiling furnace, blow in an appropriate amount of air for preliminary microwave boiling roasting (microwave frequency is 2.45GHz, power is 600W) for 1.5 hours, and adjust the furnace temperature by adding water at 610°C, most of the iron in the gold concentrate is oxidized to Fe 3 o 4 , arsenic is represented by As, As 2 S 3 、As 3 o 4 , sulfur to SO 2 , S 2 state into the smoke;

[0028] (3) Deep microwave boiling roasting: send the calcined sand produced in step (2) together with the dust...

Embodiment 2

[0033] (1) Preparation of ore pulp: Properly blend the arsenic, sulfur, carbon, and gangue-containing gold concentrates with a particle size of less than 200 meshes that account for 80% to make a slurry with a liquid-solid weight ratio of 1:3.5. Add sodium hydroxide according to 15kg / t gold concentrate, and fully stir for 3 hours;

[0034] (2) Preliminary microwave boiling roasting: the ore slurry obtained in step (1) is pumped into a preliminary microwave boiling furnace, and an appropriate amount of air is blown in to carry out preliminary microwave boiling roasting (microwave frequency is 1GHz, power is 200W) for 2 hours, and the furnace temperature is regulated by adding water. 625°C;

[0035] (3) Deep microwave boiling roasting: the calcined sand produced in step (2) and the dust collected in the flue gas are sent into the deep microwave boiling furnace together, and a large amount of air is blown into to carry out deep microwave boiling roasting (the microwave frequency ...

Embodiment 3

[0038] (1) Preparation of ore pulp: Properly blend the arsenic, sulfur, carbon, and gangue-containing gold concentrates with a particle size of less than 300 meshes and account for 70% to make a slurry with a liquid-solid weight ratio of 1:2.8. Add sodium nitrate according to 10kg / t gold concentrate, and fully stir for 2 hours;

[0039] (2) Preliminary microwave boiling roasting: the ore slurry obtained in step (1) is pumped into a preliminary microwave boiling furnace, and an appropriate amount of air is blown in to carry out preliminary microwave boiling roasting (microwave frequency is 20GHz, power is 400W) for 1 hour, and the furnace temperature is regulated by adding water. 600°C;

[0040] (3) Deep microwave boiling roasting: the calcined sand produced in step (2) and the dust collected in the flue gas are sent into the deep microwave boiling furnace together, and a large amount of air is blown in for deep microwave boiling roasting (the microwave frequency is 10GHz, and ...

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Abstract

The invention discloses a gold recovery technology for processing arsenious S-C gangue coated gold concentrate by microwave fluidized roasting, which utilizes the characteristics of microwave to carry out selective auxiliary heating on the fluidized roasting of gold concentrate which is hard to process so as to gasify S and As, open gangue and oxidize organic carbon. Thus, gold can easily expose from the collated ore, which is favourable for subsequent cyaniding and leaching and improves gold recovery rate. In addition, efficient and quick microwave processing lowers energy consumption and improves the comprehensive recovery effect of As, S, Cu, Ag and the like.

Description

technical field [0001] The invention relates to a gold extraction process of refractory gold concentrate, in particular to a gold extraction process of treating arsenic-containing sulfur gangue wrapped gold concentrate by microwave boiling roasting. Background technique [0002] A large part of my country's proven gold reserves are refractory gold concentrates. Because they contain more elements that interfere with leaching, such as arsenic, sulfur, carbon, and gold-coated gangue, traditional cyanide leaching cannot be used effectively. The specific reasons for the efficient recovery of precious gold are: [0003] (1) Arsenic in ores often exists in the form of sulfides, which are easily dissolved in alkaline cyanide solution; [0004] (2) Arsenic sulfide will decompose and consume oxygen and cyanide in the pulp to reduce the dissolution rate of gold, and the products generated by decomposition in the alkaline pulp are all in contact with the surface of gold, forming a thin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/06C22B11/08C22B3/26C22B3/46C22B11/00C22B15/00C22B30/04
CPCY02P10/20
Inventor 徐青松
Owner 广西地博矿业集团股份有限公司
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