Applicaton of grmding kinetics in oxide lead-zinc ore Selective grinding
Received:February 14, 2020  Revised:March 13, 2020
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KeyWord:oxide lead-zinc ore; grmding kinetics;established spherical diameter model;Selective grinding
           
AuthorInstitution
ZENG Mao qing The Ministry of Land and Resources Kunming Mineral Resources Surveillance Testing Centre
ZHAO Pei liang The Ministry of Land and Resources Kunming Mineral Resources Surveillance Testing Centre
LIU Quan jun Faculty of land and resource engineering,kunming university of science and technology,kunming
DENG Rong dong Faculty of land and resource engineering,kunming university of science and technology,kunming
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Abstract:
      Grinding kinetics tests were performed for mineral materials with single sizes of -1+0.074mm, -2+1mm, -3+2mm and -5+3mm respectively, which were obtained from Lanping Lead-zinc Oxide Ore Mine. Based on that, the ball diameter model, was established for lead-zinc oxide ore by using Razumov’s empirical ball diameter formula, According to the principle that the ratios of various ball diameters are basically the same as the mass percentages of single-sized materials in mixed materials to be milled, the appropriate initial ball system was obtained: namely, φ3mm, φ8mm, φ14mm and φ18mm steel balls account for 15%, 30%, 38%, and 17% respectively. Then, this ball system was used for grinding raw ore (-2+0.00mm), and compared to the empirical ball system, the yield of the slime (-0.01mm, unable to float) reduced by 5.18%, the yield of the moderately floatable particles with the size of -0.02+0.01 mm reduced by 1.34%, and the yield of the easily floatable particles with the size of +0.02 mm increased by 6.52%. Selective grinding was realized and the flotation environment for zinc oxide minerals was improved, thus resulting in an increase of 0.62% in the concentrate grade of zinc oxide and an increase of 3.45% from 83.24% to 86.69% in the total zinc recovery rate.
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