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Method for carrying out oxygen-enriched mechanical activation treatment on micro-fine particle dip dyeing type refractory gold concentrate

A technology of refractory gold and activation treatment, applied in the direction of improving process efficiency, can solve the problems of high equipment investment and operating costs, difficult acid wastewater treatment, high pressure resistance, etc., to eliminate passivation and improve reactivity. , Improve the effect of surface activation

Pending Publication Date: 2022-04-12
BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressurized oxidation equipment needs high pressure resistance, and the equipment investment and operating costs are high. In addition, the acidic wastewater generated by acidic pressurized oxidation is difficult to treat, which has become an obstacle to the wide-scale promotion of this process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 (the present invention method example)

[0023] Take 2kg of the same fine-grained disseminated gold concentrate as in Comparative Example 1, adjust the concentration of the slurry to 30%, the pH value is 7.0±0.2, and the temperature is 80°C, so that the slurry circulates between the mixing tank and the pump casing of the external centrifugal pump Flow, the slurry flow rate is about 0.8m 3 / h; feed oxygen-enriched (oxygen purity 90±1%) into the feeding pipe of the centrifugal pump, and the oxygen flow rate is about 0.1m 3 / h; CaO was used to adjust the pH value during the oxidation process, and samples were taken for cyanide leaching after 7 hours of pretreatment.

[0024] It was determined that after 7 hours of pretreatment, the effective sulfur content in the sample dropped to 8.26%, and the sulfur oxidation rate reached 69.94%. The pretreated pulp was extracted by conventional cyanidation leaching process, and the determination: the highest leaching rate...

Embodiment 2

[0027] Embodiment 2 (the present invention method example)

[0028] Take 2kg of fine-grained disseminated gold concentrate same as Comparative Example 2, adjust the slurry concentration to 25%, pH value is 4.5±0.2, and temperature is 85°C, so that the slurry circulates between the mixing tank and the pump casing of the external centrifugal pump flow, the slurry flow rate is about 0.9 m 3 / h; feed oxygen-enriched (oxygen purity 90±1%) into the feeding pipe of the centrifugal pump, and the oxygen flow rate is about 0.1m 3 / h; CaO was used to adjust the pH value during the oxidation process, and samples were taken for cyanide leaching after 7 hours of pretreatment.

[0029] It was determined that after 7 hours of pretreatment, the effective sulfur content in the sample dropped to 14.30%, and the oxidation rate of sulfur reached 60.88%. The pretreated pulp was extracted by conventional cyanide leaching process, and it was determined that the highest leaching rate of gold was Rea...

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Abstract

The invention relates to a method for carrying out oxygen-enriched mechanical activation treatment on micro-fine particle dip-dyeing type refractory gold concentrate, which comprises the following steps of: carrying out superfine grinding treatment on the micro-fine particle dip-dyeing type gold concentrate, mixing ore pulp and enriched oxygen, introducing the mixture into a pump shell, scattering oxygen-enriched gas by using violent stirring of an impeller blade to form micro-fine bubbles to enhance the oxygen dissolution degree of the ore pulp, and carrying out mechanical activation treatment on the micro-fine particle dip-dyeing type refractory gold concentrate. And meanwhile, high shearing force is generated to strip a precipitation layer on the surface of the mineral, oxidation of the superfine ground mineral is accelerated, so that the lattice structure of the mineral is destroyed, the dissociation degree of the gold mineral is increased, the gold leaching rate in the subsequent cyaniding process is increased, and efficient smelting and recycling of the micro-fine particle dip dyeing type refractory gold ore are achieved. The gold leaching rate of the ore pulp pretreated by the method is greatly improved.

Description

technical field [0001] The invention relates to the technical field of gold cyanidation smelting, in particular to a treatment method for fine-grained disseminated gold concentrate. Background technique [0002] In fine-grained disseminated gold deposits, gold-bearing minerals are usually distributed in pyrite, arsenopyrite and other minerals in the form of fine particles, or exist in the mineral lattice in the form of "similar and similar"; this type of Gold ore belongs to refractory gold ore. Even if the dissociation degree of gold is increased as much as possible by ultra-fine grinding, the ideal leaching recovery rate cannot be obtained. However, with the gradual reduction of easily smelted gold ore resources, the development of fine-grained disseminated gold ore has gradually become the key direction of technical research in the gold field. [0003] The problem of fine-grain encapsulation and "similar quality" is the main reason for the low leaching rate of fine-grain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B3/04C22B11/08
CPCY02P10/20
Inventor 李光胜朱幸福高腾跃蔡明明吉强秦广林徐超陈艳波于淙权卢中博张军童
Owner BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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