The practice of ore dressing production at home and abroad shows that the grinding operation accounts for the main part of production cost and capital investment, and the grinding is much higher than the crushed ore. Therefore, most of the mineral processing processes choose “multiple crushing and less grindingâ€. In the case of graphite beneficiation and purification, in order to protect the large scales of graphite, it is often selected to be multi-stage grinding and multi-stage sorting. The following small series will explain the 120,000 tons/year and 30,000 tons/year graphite ore dressing purification process for everyone's example, in order to get a deeper understanding of the graphite beneficiation and purification process. \A 30,000 tons / year graphite ore dressing process in Heilongjiang\ 1. Mineral processing design indicators Raw ore: small scale graphite mine. Treatment capacity: 187,000 tons of raw ore, with an annual output of 30,000 tons of concentrate (15,000 tons of 85% graphite concentrate, 15,000 tons of 95% graphite concentrate). Estimated investment: 75 million yuan. Table 1 Mineral processing design indicators 2. Graphite beneficiation process The graphite beneficiation process mainly includes: two-stage open circuit crushing system, one section of closed-circuit rough grinding, one section of rough selection, one sweeping, nine selections, six concentrate re-grinding and three medium-concentration returning systems. (annual production of 30,000 tons of graphite ore dressing purification process) (1) broken After the ore is transported to the ore yard by the truck, the ore is fed into the receiving bin with a forklift. The feeder is provided with a feeder, and the ore is fed into the crusher for coarse crushing. The crushed product is broken by the belt conveyor. The machine is finely crushed, and the broken product is transported to the grinding ore bin by a belt conveyor. (2) Grinding and grading There is a feeder under the grinding ore bin. The powder ore is sent to the ball mill through a belt conveyor for grinding. The product is graded into a classifier, and the classifier returns to the ball mill to form a closed-circuit grinding. (3) Flotation The graded overflow is fed to the flotation machine for rough selection, and the rough tailings are selected as the final tailings after one sweep, and the sweeping is returned to the classifier. The rough-selected concentrate enters the flotation machine for a selection, and a selected concentrate is re-grinded into the ball mill. After grinding, it enters the second selection, and the second selected tailings are fed into the lattice ball mill for secondary re-grinding of the concentrate. The second selected tailings merged together to form the middle mine 1 and the middle mine 1 was pumped into the classifier. The secondary regrinding and discharging pump is used to select three times into the flotation machine, three times to refine the ore to the flotation machine for four times, and four times to select the concentrate for pumping into the ball mill for three times. mill. Three times of re-grinding and discharging into the flotation machine for five times of selection, five selected concentrates to the flotation machine for six selections, six times of concentrate pumping to the ball mill for concentrate re-grinding four times. Four re-grindings were sent to the flotation machine for seven times. The three, four, five, and six selected tailings are combined to form the middle mine 2, and the middle mine 2 is pumped into the stirred tank. Seven times of selected concentrates were pumped into the ball mill for five times of re-grinding. Five times of re-grinding and discharging were sent to the flotation machine for eight times. Eight times of selected concentrates were pumped into the ball mill for concentrate. Re-grinding six times. Six times of re-grinding and discharging to the selection machine for nine selections, nine selected concentrates for the final concentrate, seven, eight, nine selected tailings combined to form the middle mine 3, the middle mine 3 pump Give a selection. (4) Dehydration The final concentrate is dehydrated by a filter to obtain a concentrate containing about 30% of water. After drying, it is weighed and packaged for sale. Finally, the tailings are pumped to the tailings pond for storage. 3. Selection of mineral processing equipment The main equipment required for this graphite beneficiation process is as follows: Table 2 Equipment Schedule \In Inner Mongolia, a 120,000 tons / year graphite ore dressing process\ 1. Mineral processing design indicators Original ore: graphite mine in Huangtu Yao Village, Dianzi Town, Xinghe County, Inner Mongolia, with a fixed carbon content of 5.43% and an ore processing capacity of 8000t/d; Granular product granularity: 0-2mm. Grinding fineness: -200 mesh content accounts for 45% (-0.074mm) Treatment capacity: an annual output of 120,000 tons of concentrate, the carbon content is 96.82%, and the recovery rate is 89.15%. Concentrate water content: 12%, the moisture content of graphite fine powder after drying is <0.3%; Water content of tailings: 20%. Planned investment: 300 million yuan. Table 3 Analysis of chemical elements in graphite ore Table 4 graphite beneficiation design indicators 2, mineral processing process The graphite beneficiation and purification process is as follows: a closed-circuit selection process of coarse and coarse sweeping of eight concentrates and eight selections. The raw ore is subjected to a process of “crushing and sieving-grinding-flotation-filtration†to finally obtain a graphite fine powder having a carbon content of 96.92% and a recovery rate of 89.15%. The plant consists of crushing and screening, grinding, flotation, concentrate concentration and pressure filtration, drying and packaging. (annual production of 120,000 tons of graphite ore dressing purification process) (1) Breaking process The crushing system process adopts a three-stage and one-closed process, and the designed ore size is below 900mm, and the final crushed product has a particle size of 0-2mm. The ore is vibrated to the mining machine and evenly fed into the (600×900) jaw crusher for coarse crushing. The coarsely crushed product is conveyed to the ZD1800×3600 vibrating screen through the 1# belt conveyor, and the sieved product enters the powder mine bin. The product on the sieve enters the medium crushing (1200×250) jaw crusher, and the medium crushed product 2# belt conveyor is transported to the PCB1316 hammer crusher for fine crushing. The fine crushed product enters the 1# belt conveyor and re-enters the ZD1800×3600 vibrating screen. The sieved product is sent to the powder ore bin via a 3# belt conveyor. (2) Grinding and flotation process The powder ore is evenly fed into the MQG2700×4500 wet lattice ball mill through a feeder. The ball mill has a grain size of 2 to 0 mm, a slurry concentration of 25%, and a final grinding fineness of -200 mesh content of 45% (-0.074 mm). The ball mill discharges the FG-24 single spiral classifier to classify, and the classifier returns to the sand to return to the MQG2700×4500 wet lattice ball mill to continue grinding. Classifier overflow stirred tank added to the crude oil is selected from complement and coal collector # 2 oil, pH adjusting agent and inhibitor of lime water glass, after dosing pulp into the flotation machine for roughing. During the rough selection process, the coarse tailings produced by the rough selection process are subjected to a sweep, and the middle pulp produced by the sweeping process is returned to the dosing tank and re-entered into the roughing stage. The tailings slurry is swept into the tailings collection tank and pumped into the tailings pond by the slurry pump. The coarse concentrate slurry produced by the rough selection process is fed into the MQY1200×4500 wet overflow ball mill for secondary grinding. The ground slurry enters the fine grinding flotation system and adopts the eight-milling and eight-selection flotation process. (3) Concentrate dehydration After eight grinding and eight selection, the graphite concentrate slurry is sent to a high-efficiency thickener for concentration. After concentration, the slurry is pumped into a filter press for pressure filtration, and the filter press overflows to return to the beneficiation system. The water content of the concentrate after pressure filtration is about 12%, and the concentrate is sent to the drying system through the 4# belt conveyor. (4) drying, screening and packaging The graphite concentrate is dried by RFL-240 clean coal-fired hot blast stove. After the air is heated, it passes through the dust-reducing chamber to reduce dust into the drying cylinder. The water vapor generated by the product drying process is transported to the gas collecting hood through the pipeline, and the product packaging bag is connected under the gas collecting hood. The graphite fine powder carried by the water vapor naturally settles into the packaging bag for sale, and the water vapor naturally evaporates. After the hot air is heated and dried, it is discharged by the exhaust pipe. After drying, the product enters the product GS1400×6300 drum screen through the hot air furnace discharge port for screening. The sieved product is negative-level graphite fine powder, which is transported to the bagged packaging machine for packaging by 5# belt. The graphite fine powder on the sieve is sieved into a PMS1000×4000 flat sieve, and the graphite fine powder of different particle size specifications is sieved. 3. Details of mineral processing equipment The main equipment required for this graphite beneficiation process is as follows: Bollard Ship,Anchor Fairlead,Bollard Of Ship,Ship Mooring Bollard Jiangsu Zhongcan Marine Equipment Co.,Ltd. , https://www.anchorchainzc.com