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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (5): 80-84.doi: 10.11872/j.issn.1005-2518.2017.05.080

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Feasibility Study of Flash Flotation of a Gold Mine in Plateau Area of Qinghai Province

LI Fei 1，2，CHEN Ziqiang 1，2   

  1. 1.Qinghai 6th Institute of Geology and Mineral Exploration，Xining    816000，Qinghai，China；
    2.The Engineering and Technology Research Center for the Development of Gold Mining Resources in Qinghai Province，Dulan    816100，Qinghai，China
  • Received:2017-06-28 Revised:2017-08-11 Online:2017-10-30 Published:2018-02-12

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Abstract:

 The raw ore of a gold mine in plateau area of Qinghai Province belongs to fine grained altered rock type，the recovery rate of flotation is low.By adjusting the flotation process parameters，the flotation effect has not been significantly improved.Through investigation of grading classification process and analysis of hydrocyclone’s underflow size sieve，it is found that the classification efficiency of hydrocyclone is 43%~ 60%，and the phenomenon of “anti-enrichment” exist in the underflow，in which the gold content of some particles reached above 20×10-6.Those useful minerals of monomeric dissociation were circulated in closed circuit process and easily causing overgrinding and slime encapsulation，which limited the flotability of useful minerals，so the recovery rate is difficult to effectively enhance.The simulation of manufacturing process was conducted in laboratory，by increasing flash flotation operation at the underflow of a hydrocyclone，the yield of concentrate in flash flotation reached 4.07%，and the grade of gold in concentrate reached 38.31×10-6.The useful mineral of monomeric dissociation in the underflow of a hydrocyclone has been collected by the flash flotation to achieve the effect of “early and quick collection”，reducing the probability of overgrinding and slime encapsulation of these useful minerals.The overflow continued to be ground to the required fineness to carry out closed-circuit test of routine flotation，and the comprehensive recovery of gold was increased from 80.90% under the conventional flotation process to 83.96%.

Key words:  grinding and classification, overgrinding, monomeric dissociation, flash flotation, plateau area, Qinghai Province

CLC Number: 

  • TD953

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