Beneficiation method for high-carbon fine particle embedded gold ore

A beneficiation method and fine-grained technology, which is applied in the field of beneficiation of high-carbon fine-grained gold ore, can solve the problems of increased grinding costs, increased management costs, and secondary carbon pollution, so as to improve the recovery rate and save combustion Cost, the effect of removing secondary pollution

Inactive Publication Date: 2013-01-16
SHANYANG TAIJIN MINING
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  • Summary
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  • Description
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Problems solved by technology

At present, this process is limited to the laboratory. The main reason is that the high roasting temperature leads to increased fuel, equipment maintenance, and management costs; it is

Method used

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  • Beneficiation method for high-carbon fine particle embedded gold ore

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Embodiment 1

[0019] A gold mine in Shanyang, Shaanxi Province, X-ray diffraction analysis, the ore is a micro-gold ore of less sulfide carbon-containing peg siliceous slate type, quartz agglomerate (vein) type and breccia type, and a natural type of mixed ore. The metallic minerals in the ore are mainly pyrite and chalcopyrite; the non-metallic minerals are mainly quartz. The ore is characterized by fine gold particle size (<0.01mm); high carbon content, composed of organic carbon and graphitic carbon, with organic carbon content of 3.64% and graphitic carbon of 2.71%.

[0020] The mine adopts the process shown in the attached figure, with a daily processing capacity of 200 tons / day of raw ore. The ore is crushed and screened in two stages. After screening, the ore is cached in the sub-ore warehouse and then enters the rotary kiln. The inner diameter of the rotary kiln is 3.6m and the length is 54m. , the inclination angle is 3°, the material filling rate is 12~13%, and the speed is 6min / t...

Embodiment 2

[0026] A gold mine in Luonan County, Shaanxi Province, the ore type is a carbon-containing slate with less sulfide, and the main minerals are pyrite, red limonite, chalcopyrite, etc.; the gangue minerals are mainly quartz, feldspar, Carbonate minerals, graphite, organic carbon and argillaceous minerals have a total carbon content of about 4.5%. The particle size of natural gold is mainly concentrated between 0.002~0.005mm. The gold carrier minerals are minerals such as pyrite and carbonaceous minerals. The carrier and gold have an obvious package relationship, and the gold content in the carbonaceous minerals is about 17%.

[0027] The ore has been carried out in a pilot test (experiment scale: 300kg / time) using the process shown in the attached figure. The ore is crushed and screened. After screening, the ore enters the rotary kiln (Φ300×6200 rotary kiln), and the material filling rate is 12~13%. The rotation speed is 6min / cycle, the inclination angle is 3%, the rotary kiln ...

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Abstract

The invention provides a beneficiation method for a high-carbon fine particle embedded gold ore. The method comprises the following steps of: crushing and screening a raw ore; baking the crushed and screened raw ore in a rotary kiln by gas at 650 DEG C for 2-3 h, wherein the gas is produced by coal-to-gas equipment; water quenching the baked gold ore to no more than 50 DEG C, adding 400 g/t kerosene to shield insufficiently-combusted carbon; and finally leaching the gold ore by using a cyanide process. According to the method provided by the invention, the baking temperature is lowered from 750 DEG C to 650 DEG C under the condition that the recovery rate is ensured, and thus, the combustion cost is reduced, the service life of the equipment is prolonged and the labor intensity of workers is reduced; as the insufficiently-combusted carbon is shielded, the leaching rate of the gold is increased, and the gold leaching rate is more than 85 percent; in addition, the pulverized coal injection is replaced by the rotary kiln and the coal-to-gas process, the temperature control efficiency is increased, the secondary pollution of the carbon is removed, and the industrialization becomes possible.

Description

technical field [0001] The invention relates to a gold ore beneficiation method, in particular to a gold ore beneficiation method with high-carbon microfine particle embedding. Background technique [0002] With the increasing scarcity of gold resources, the development of refractory carbon-bearing gold deposits has been put on the agenda. When the ore contains graphite and other forms of carbon, especially organic carbon, the flotation process can be used to make the finely ground gold and carbon co-float, so as to obtain qualified gold concentrate products. However, the requirement of flotation for mineral embedding particle size is generally >10um. When the particle size of gold inlays is less than 10 microns, the flotation process will deteriorate seriously, and it will be more difficult to separate gold and gangue minerals through flotation, resulting in a decrease in the grade and recovery rate of gold concentrate. The utilization level of gold resources is not hig...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/26C22B11/08
Inventor 刘利军徐世杰卫亚儒汪建鑫李继壁马晶郭月琴刘景怀
Owner SHANYANG TAIJIN MINING
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