Method for improving leaching efficiency of gold in pressurized oxidizing slag of gold concentrate

A gold concentrate and oxidized slag technology, applied in the field of hydrometallurgy, can solve problems such as reducing gold leaching rate, and achieve the effects of improving resource utilization rate, high gold recovery rate, and simple process

Inactive Publication Date: 2019-07-02
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the chemical phase analysis, the generated gypsum will also wrap the gold and reduce the leaching rate of gold

Method used

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  • Method for improving leaching efficiency of gold in pressurized oxidizing slag of gold concentrate
  • Method for improving leaching efficiency of gold in pressurized oxidizing slag of gold concentrate
  • Method for improving leaching efficiency of gold in pressurized oxidizing slag of gold concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The gold concentrate oxidized slurry obtained by pressurized oxidation of gold concentrate in a pressurized plant contains 22-25g / t of gold, and the sulfur oxidation rate is >98%.

[0027] Such as figure 1 As shown, the mass concentration of gold concentrate oxidized ore pulp after CCD washing is 45%, and the oxidized ore pulp after CCD washing passes through 3 reaction tanks in series successively, and the gold concentrate oxidized ore pulp after washing is subjected to three times in the 3 reaction tanks successively. heat treatment; the three reaction tanks are respectively named No. 1 reaction tank, No. 2 reaction tank and No. 3 reaction tank along the slurry flow direction.

[0028] Use the hot gas discharged from flash evaporation as the heat source, keep the gold concentrate oxidation slurry temperature in No. 1 reaction tank, No. 2 reaction tank and No. potion. The medicament includes 5% limestone and 95% lime by mass percentage, and the total amount of oxidiz...

Embodiment 2

[0032] The gold concentrate oxidized slurry obtained by pressure oxidation of gold concentrate in a pressurized plant contains 28g / t of gold, and the sulfur oxidation rate is >98%.

[0033] The mass concentration of the gold concentrate oxidized pulp after CCD washing is 45%, and the oxidized ore pulp after CCD washing passes through 3 reaction tanks in series in turn, and the washed gold concentrate oxidized pulp is subjected to three-stage heat treatment in the 3 reaction tanks; The three reaction tanks are respectively named as No. 1 reaction tank, No. 2 reaction tank and No. 3 reaction tank along the flow direction of the pulp.

[0034] Use the hot gas discharged from the flash as the heat source, keep the gold concentrate oxidation slurry temperature in the first reaction tank, the second reaction tank and the third reaction tank at 85°C, 80°C, and 75°C respectively potion. The medicament includes 5% of limestone, 35% of calcium carbide slag, and 60% of lime by mass perc...

Embodiment 3

[0038] The gold concentrate oxidized slurry obtained by pressurized oxidation of gold concentrate in a pressurized plant contains 19g / t of gold, and the sulfur oxidation rate is >98%.

[0039] The mass concentration of the gold concentrate oxidized pulp after CCD washing is 45%, and the oxidized ore pulp after CCD washing passes through 3 reaction tanks in series in turn, and the washed gold concentrate oxidized pulp is subjected to three-stage heat treatment in the 3 reaction tanks; The three reaction tanks are respectively named No. 1 reaction tank, No. 2 reaction tank and No. 3 reaction tank along the slurry flow direction.

[0040]Use the hot gas discharged from the flash as the heat source, keep the gold concentrate oxidation slurry temperature in the first reaction tank, the second reaction tank and the third reaction tank at 90°C, 85°C, and 80°C respectively potion. The medicament includes 10% of limestone, 25% of caustic soda, and 65% of lime by mass percentage. Add 4...

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Abstract

The invention discloses a method for improving the leaching efficiency of gold in pressurized oxidizing slag of gold concentrate. The technology characteristics of a pressurizing oxidizing slag are combined, waste heat of flashing is recycled, washed oxidizing ore pulp of the gold concentrate is introduced, an reagent breaking wrapping of vitriol class and gypsum is added in a serial reaction tank, temperature and reaction parameters on different stages are controlled, thus reaction is completed under the condition of low dosage of the reagent, and treated oxidizing ore pulp enters a gold extraction system again after being cooled. According to the method, dissociation gold wrapped with the vitriol class and gypsum class can be opened, the waste heat of a flashing system is used, treatmentcan be completed only by using reaction of traditional reagents and a stirring tank, thus the high recovery rate of gold is achieved in the gold extraction process, the technology is simple, convenient and economic, meanwhile adaptability of the pressurizing technology is also improved, the application range of the method is broadened, the resource utilization rate is improved, and the effect isobvious.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for increasing the leaching rate of gold in pressurized oxidation slag of gold concentrate. Background technique [0002] Flotation gold concentrate contains pyrite, arsenopyrite and other minerals, which will wrap gold particles. The finer the gold particles, the less likely the wrapped gold will be exposed and effectively recovered. At present, there is a common problem of sulfide-encapsulated gold in flotation gold concentrates at home and abroad. For such concentrates, it is necessary to open the sulfide-encapsulated gold through fine grinding or oxidation to obtain a satisfactory gold leaching rate. [0003] Pressurized oxidation is currently the most effective process for treating sulfide-coated gold ore. It can completely oxidize sulfide and open the wrapped gold. Treatment effect, the sulfur oxidation rate can reach more than 97%, and the gold recovery r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B11/08
CPCC22B3/12C22B11/04C22B11/08Y02P10/20
Inventor 蔡创开王乾坤熊明卢松郭金溢许晓阳苏秀珠杨叶艳
Owner 厦门紫金矿冶技术有限公司
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