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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (2): 203-211.doi: 10.11872/j.issn.1005-2518.2018.02.203

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Experimental Study on Gold Flotation of Gravity Tailings

YANG Wei，DONG Ping，DENG Zhong   

  1. College of Materials and Mineral Resources，Xi’an University of Architecture and Technology，Xi’an 710055，Shaanxi，China
  • Received:2017-08-15 Revised:2017-12-30 Online:2018-04-30 Published:2018-05-19

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Abstract:

Based on the mineralogy characteristics，the research on the comprehensive recovery and utilization of gold in a gravity separation tailings (the main gold-bearing minerals are pyrrhotite and pyrite)was carried out.Under the condition that the gringding fineness is -0.074 mm content of 70%,NaOH is used to adjust the pulp pH=8,the collector is isoamyl xanthate+ammonium butylate,the flotation concentration is 33%,the coarse selection time is 3 min,the flotation concentrate with gold grade of 28.40 g/t can be obtained through a closed test process of one stage roughing,two stage cleaning and three stage scavenging,and the recovery rate of gold was 93.47%.It is found through experimental research that under the condition of low alkalinity,when NaOH is used as pH regulator,the flotation effect of gold is better than lime;Compared with butyl xanthate,unsing isoamyl xanthate as collector has a better effect on improving the recovery rate of gold under lime syste;At the same time,the combination of xanthate and aerofloat will play a synergistic role,which can also significantly improve the gold separation effect.

Key words: gravity tailing of gold, pyrrhotite, flotation, regulator；collector

CLC Number: 

  • TD923.7

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