Li whole of cassiterite - sulfide minerals, lead-antimony cassiterite - zinc sulfide ore were studied. The new process uses pre-screening, stage grinding, and new high-frequency fine-screening to reduce over-pulverization of cassiterite; magnetic separation (selective particle size –1.43mm) is selected at the front of the process to select about 25% of the magnetic material. pyrrhotite flotation and interference to other selected from shaking, and to improve the processing plant processing capacity; flotation Enhancement desulfurization, to create conditions for recovering cassiterite reselection and the selected particle size was selected to -0.25 mm, and Considering the particle size requirements of sulfide ore flotation and shaker recovery tin; the process basically solves the separation between cassiterite and sulfide ore and gangue and the separation between sulfide ore.
The Jianfengpo tin deposit in Jiangxi belongs to the cassite polymetallic sulfide ore deposit. The ore contains a large amount of sulfide ore and a considerable amount of iron oxide minerals and iron carbonate minerals. The size of the cassiterite is fine and the dispersion rate is high. For the refractory cassiterite polymetallic sulphide ore, the process of “pre-desulfurization of floating zinc – flotation tailings re-election of tin†is used for sorting. In the case of 0.70% of raw ore Sn grade, the final grade is 54.38. %, the recovery of 54.28% tin concentrate; at the same time get high-grade zinc products, tin and zinc are effectively recovered.
Beneficiation process of the Lu Xinyi silver rock tin were studied, the mine belongs porphyry tin deposit, in addition to tin-containing ores, but still contains a small amount of tungsten, molybdenum, bismuth, copper and other valuable elements. The first flotation sulfide ore is used to recover the cassiterite from the sulphur tailings by re-election-fine mud flotation-re-election process, and the tin concentrate with 56.11% tin and 74.20% recovery is obtained, and the molybdenum containing 47.22 is recovered. %, a molybdenum concentrate product with a recovery rate of 67.65%. The process technology is feasible, economical, simple, and reliable.
Li Zhenghui also adopted a flotation and re-election joint process in the ore dressing test of the old plant cassite polymetallic oxygen-sulfur mixed mine. The use of fine crushing, pre-selection waste, flotation de-mixing, enhanced float washing and other processes to improve tin beneficiation recovery rate of 1.28 percentage points.
Zhang Jie et al. conducted a comprehensive recovery process study on a certain cassiterite polymetallic sulphide ore in Yunnan. The cassiterite polymetallic sulfide ore is a complex refractory polymetallic ore. In addition to Sn and Zn, it is also accompanied by components such as Cu, S, Fe, and As, and also contains Ge, Ga, Cd, In, Ag, etc. Rare and precious metal elements. Through the study of the mineralogical analysis and sorting process of the mineral, the principle process of pre-mixing copper-sulfur-re-selected zinc-magnetically-selected iron-re-elected tin was carried out, and raw ore coarse grinding, ore fine grinding and raw ore were carried out. The coarse grinding-sulphur coarse concentrate is re-grinded into a small closed-circuit test of various grinding conditions, and the shaker re-election process and the composite force field re-election equipment tailing-shake selection process are carried out on the flotation tailings. It achieved good beneficiation effect, and finally obtained 49.64% tin concentrate grade, recovery rate 54.03%; zinc concentrate grade 42.79%, recovery rate 88.41%, other rare and precious metals were also enriched.
Re-election is the most important method for the selection of cassiterite polymetallic sulphide ore. At present, an important development trend is from the single gravity ore dressing to the combination of heavy, floating, magnetic and electric beneficiation technologies , from recycling single tin concentrate products. The transition to a comprehensive recovery of a variety of useful concentrate products.
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