China's copper ore reserves of copper is one of the world more. The total reserves of copper is 62.43 million tons, ranking 7th in the world. Among the proven reserves, copper-rich ore accounts for 35%. Copper mines are widely distributed. Except for Tianjin and Hong Kong, all provinces (cities, districts) including Shanghai, Chongqing and Taiwan have output. There are 910 mines with proven reserves. Jiangxi's copper reserves ranked first in the country, accounting for 20.8%, followed by Tibet, accounting for 15%; once again in Yunnan, Gansu, Anhui, Inner Mongolia, Shanxi, Hubei and other provinces, the province's copper reserves are more than 3 million tons.
The process of copper ore dressing equipment is divided into three parts:
1. Broken part: The basic process of crushing the ore process. The purpose is to crush the ore to an appropriate size and is suitable for grinding a part.
2. Grinding part: Grinding and pulverizing part Further processing the ore to obtain a smaller size is to match the flotation separation material 3. Flotation part: flotation process / important process of upgrading copper ore. Chemical reagents will be added to the mixer/mixer to make a chemical reaction.
The mined ore is firstly crushed by a jaw crusher. After being crushed to a reasonable fineness, it is evenly fed into the ball mill through a hoist and a feeder, and the ore is crushed and ground by a ball mill.
The ore fines ground by the ball mill enter the next process: classification. The spiral classifier cleans and classifies the ore mixture by the principle that the specific gravity of the solid particles is different and the rate of precipitation in the liquid is different. The washed and graded mineral mixture passes through the magnetic separator
Since the specific susceptibilities of the various minerals are different, the magnetic substances in the mixture are separated by magnetic force and mechanical force. The mineral particles that have been initially separated by the magnetic separator are sent to the flotation machine, and different drugs are added according to different mineral characteristics, so that the desired minerals are separated from other substances.
After the desired minerals are separated, because they contain a large amount of water, they must be initially concentrated by a thickener and then dried by a dryer to obtain dried minerals. The copper powder grade can reach 45%.
Flotation of two common copper ores in copper ore beneficiation process
1. Flotation of dyed copper ore
Generally, a relatively simple process is adopted. After a period of grinding, the fineness-200 mesh accounts for about 50%-70%, one rough selection, 2-3 times selection, and 1-2 sweeps. If the particle size of the copper mineral is relatively fine, a stage grinding process may be considered. Most of the concentrating plants that deal with the porphyry ore are re-grinding with coarse concentrates—a selective stage grinding process, which is essentially a mixing-priority flotation process. After a rough grinding, rough selection, sweeping, and then re-grinding the coarse concentrate to obtain high-grade copper concentrate and sulfur concentrate. Rough grinding fineness - 200 mesh accounts for about 45% - 50%, and regrind - 200 mesh accounts for about 90% - 95%.
2. Flotation of dense copper ore
Since the dense copper ore chalcopyrite and pyrite symbiotic dense, pyrite is often activated secondary copper minerals, high pyrite content, it is difficult to suppress, separation difficulties. Copper concentrate and sulfur concentrate are required to be obtained simultaneously during the sorting process. The tailings usually selected after copper are sulfur concentrates. If the content of gangue in the ore exceeds 20% to 25%, it is necessary to sort again to obtain the concentrate. For the treatment of dense copper ore, two-stage grinding or stage grinding is often used, and the fineness of grinding is required to be fine. The dosage of the drug is also large, the amount of yellow drug is more than 100g/(t ore), and the lime is 8~10kg (t ore).
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