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Biological pre-oxidation treatment process of low-grade refractory gold ores or ore concentrate

A low-grade, gold concentrate technology, applied in the direction of improving process efficiency, etc., can solve the problems of long biological pre-oxidation period, insufficient exposure of gold particles, low arsenic and sulfur oxidation rate, etc., achieve no harmful gas emissions, improve comprehensive Effect of low recycling rate and operating cost

Inactive Publication Date: 2012-07-11
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

[0004] At present, for low-grade refractory gold ores, there are still technical problems such as low flotation recovery rate, low arsenic and sulfur oxidation rate in the pretreatment process, long biological pre-oxidation cycle, insufficient exposure of gold particles, and serious environmental pollution. There is an urgent need for low-cost, high-efficiency, and low-pollution technologies to be developed

Method used

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  • Biological pre-oxidation treatment process of low-grade refractory gold ores or ore concentrate
  • Biological pre-oxidation treatment process of low-grade refractory gold ores or ore concentrate

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Embodiment

[0031] The main type of ore in a domestic gold mine is sulfide carbonaceous fine particle disseminated refractory gold ore, the gold grade is 2.98g / t, the sulfur content is 9.5%, and the sulfide content is 25-30%. The ore is a sulfide ore with pyrite as the matrix mineral. The gold particle size is very fine, the largest gold particle is less than 8μm, and most of the others are below 5μm. Most of them are disseminated in sulfide, accounting for 90% of the total gold content. Most of the iron and sulfur in the ore form sulfide minerals - pyrite, marcasite and arsenopyrite, a small part of iron forms iron oxide minerals - magnetite, hematite, limonite, and some iron Distributed in carbonate minerals and aluminosilicate minerals in the form of impurities; gangue minerals mainly include quartz, feldspar, chlorite, sericite and carbonate minerals. Pyrite is the main sulfide mineral, mostly in colloidal structure, high degree of crystallization, fine particle size, more than 50% of...

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Abstract

The invention provides a biological pre-oxidation treatment process of low-grade refractory gold ores or ore concentrate, which is a new process comprising the following steps: wrapping low-grade refractory ore concentrate on the surface of supporting ore particles, performing biological heap leaching preoxidation, washing and screening the slag, returning large particles to supplement supporting materials, and extracting gold from the gold ore concentrate-wrapped and pre-oxidized slag by cyanation. Bacteria are mixed bacteria mainly comprising Thiobacillus ferrooxidans, Thiobacillus thioxidans and Leptospirillum ferrooxidans, and the temperature is 30-45 DEG C; the particle sizes of the ore concentrate and the supporting ore are respectively 80-400 meshes and 10-30mm, and the wrapping thickness of the ore concentrate is less than 2mm; and the preoxidation period is 30-90 days, the preoxidation rate is increased to 50-70%, and the recovery rate of gold is up to 80-95%. Compared with biological stirring preoxidation and complete heap leaching preoxidation, the preoxidation treatment process provided by the invention solves the problems of long preoxidation period and low gold recovery rate, and has remarkable economic benefits. The process of the invention is especially suitable for gold ores with high content of pyrite, is environment-friendly, and is in line with the development of low-carbon economy in nonferrous metallurgy industry.

Description

technical field [0001] Mainly use the ore leaching microbial community with iron oxidation performance and sulfur oxidation performance, adjust the oxidation performance of ore leaching microorganisms through domestication, achieve efficient oxidation of gold concentrate wrapped on the surface of the supporting ore, fully expose the wrapped gold, and improve the comprehensive recovery of gold Rate. This process is an energy-saving, environmentally friendly and efficient extraction technology for low-grade refractory metallurgical ore resources. Background technique [0002] Refractory ores are usually high-arsenic, high-sulfur, high-carbon and fine-grain disseminated gold ores, which account for about 2 / 3 of the world's total gold ore resources and about 1 / 4 of my country's proven reserves. In the Golden Triangle of Yunnan, Guangxi, Guizhou and Liaoning, Sichuan and Gansu provinces. This type of gold deposit has low grade, large scale, indistinct boundary between ore body a...

Claims

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Application Information

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IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 武彪温建康陈勃伟刘美林姚国成刘学
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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