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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 harsh production conditions, high equipment requirements and high maintenance costs, and achieve the effects of promoting monomer dissociation, reducing energy consumption and improving recovery rate.

Inactive Publication Date: 2011-01-19
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 gold concentrate containing arsenic, sulfur, carbon and gangue with a particle size of less than 200 meshes and 60% of the gangue is properly blended to prepare a slurry with a liquid-solid weight ratio of 1:2.5. Add sodium carbonate according to 20kg / t gold concentrate and stir fully for 4 hours;

[0027] (2) Preliminary microwave boiling roasting: the slurry obtained in step (1) is pumped into the preliminary microwave boiling furnace, and an appropriate amount of air is blown into the preliminary microwave boiling roasting (microwave frequency 2.45GHz, power 600W) for 1.5 hours, and the furnace temperature is adjusted by adding water At 610℃, most of the iron in the gold concentrate is oxidized to Fe 3 O 4 , Arsenic uses As, As 2 S 3 , As 3 O 4 , Sulfur to SO 2 , S 2 Into the flue gas;

[0028] (3) Deep microwave boiling roasting: the calcine produced in step (2) and the dust collected in the flue gas are sent into a deep microwave boiling...

Embodiment 2

[0033] (1) Preparation of ore pulp: The gold concentrate containing arsenic, sulfur, carbon and gangue with a particle size of less than 200 meshes and accounting for 80% is coated with a reasonable ore mixture to prepare a slurry with a liquid-solid weight ratio of 1:3.5. Add sodium hydroxide at 15kg / t gold concentrate, and stir fully for 3 hours;

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

[0035] (3) Deep microwave boiling roasting: The calcine produced in step (2) and the smoke collected in the flue gas are sent into a deep microwave boiling furnace, and a large amount of air is blown into deep microwave boiling roasting (microwave frequency is 2.45GHz, power is 400W) 1 h...

Embodiment 3

[0038] (1) Preparation of ore pulp: the gold concentrate containing arsenic, sulfur, carbon and gangue with a particle size of less than 300 meshes and accounting for 70% is coated with a reasonable ore mixture to prepare a slurry with a liquid-solid weight ratio of 1:2.8. Add sodium nitrate at 10kg / t gold concentrate, and stir thoroughly for 2 hours;

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

[0040] (3) Deep microwave boiling roasting: The calcine produced in step (2) and the smoke collected in the flue gas are sent into a deep microwave boiling furnace, and a large amount of air is blown into deep microwave boiling roasting (microwave frequency is 10GHz, power is 5000W ) ...

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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 for difficult-to-treat gold concentrates, in particular to a gold extraction process for microwave boiling roasting treatment of arsenic-sulfur-containing carbon gangue coated gold concentrates. Background technique [0002] A large part of my country’s proven gold reserves belong to difficult-to-treat gold concentrates. Because it contains many interfering leaching elements such as arsenic, sulfur, carbon and gangues that coat gold, traditional cyanide leaching is not effective. The specific reasons for the recovery of precious gold are: [0003] (1) Arsenic in ore often exists in the form of sulfide, which is easily dissolved in alkaline cyanide solution; [0004] (2) The sulfide of arsenic will decompose and consume oxygen and cyanide in the pulp and reduce the dissolution rate of gold, and the products decomposed in alkaline pulp will contact the surface of gold, forming a thin film on the surface of gold p...

Claims

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Application Information

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Patent Type & Authority Applications(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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