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Gold Science and Technology ›› 2016, Vol. 24 ›› Issue (1): 102-107.doi: 10.11872/j.issn.1005-2518.2016.01.102

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Study on Gold Leaching from Ores with Modified Lime-Sulpher- Synthetic-Solution Process

FENG Jie，FU Pingfeng，YANG Tian   

  1. School of Civil and Environmental Engineering， University of Science and Technology Beijing，Beijing    100083，China
  • Received:2015-12-01 Revised:2015-12-30 Online:2016-02-29 Published:2016-04-05

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Abstract:

The minerals in a native gold ore had great differences in the grindability property. Lots of fine muds were generated in the grinding process.The gismondite with the high adsorption of gold ions was presented in the ore.Thus the leaching ratio of gold for the gold ore was relatively low by traditional cyaniding method. In this paper，the agitated leaching of the gold ore was studied with Modified Lime-Sulpher-Synthetic-Solution（MLSSS） process.The leaching effects of grinding particle size，slurry pH，added amount of MLSSS reagent，leaching time，oxidant species and their added amount were discussed.The optimum leaching conditions were as follows： weight ratio of liquid to solid was 2.0，55% grinding ore was less than 45 μm，slurry pH was 11.0，leaching time was 6.0 h，added MLSSS reagent was 8 kg/t（ore） and H2O2 amount was 3.33 kg/t（ore），respectively.The gold leaching ratio of 89.81% was achieved.By comparing to the cyaniding method，the gold leaching ratio increased by 16.35% with the MLSSS process.The dissolved oxygen generated from H2O2 could promote the reactions of gold with active ingredients in the MLSSS reagent.Additionally，the H2O2 could directly oxidize gold containing pyrites，which enhanced the gold dissolving reactions.

Key words:  Modified Lime-Sulpher-Synthetic-Solution process, gold ore, leaching, hydrogen peroxide

CLC Number: 

  • TF831

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