四川某高碱性含铜金矿综合回收钙镁铜金试验研究

doi:10.11872/j.issn.1005-2518.2019.05.777

Abstract

Abstract:

The high alkaline copper-bearing gold ore usually have the following three characteristics：（1） The alkaline gangue has a high content，and often contains a large amount of carbonate minerals，such as calcite and dolomite.（2） The copper content is relatively high，and the copper content in the ore is usually above 1.0%.（3） The high alkaline copper-bearing gold ore is often mixed with both sulfide and oxidized minerals，as well as arsenic and other toxic and harmful elements.It is difficult to obtain the ideal separation index by conventional mineral processing methods. However，with the gradual decreasement of easily-recover gold ores，more and more attention has been paid to the study on the metallurgical technology of refractory gold ores.The technological process，Roasting of raw ore to remove carbon and arsenic-Rapid leached by ammonium chloride of calcium-Ammonium sulfate leaching of magnesium and copper-Non-cyanide leaching （swust-1） of gold，was used to recover valuable elements from ore，and to increase recovery rate of “three high” gold mine，the gold ores characterize high-carbonate，high-arsenic and high-copper.The result shows that leaching rate of calcium，magnesium and copper reached 82.88%，20.12% and 16.75%，recpectively，when calcination temperature is 950 ℃，calcination time is 2 h，pulp density is 30%，-0.074 mm grain size content is 70%，ammonium chloride concentration is 3.0 mol/L，and leaching time is 10 min. After “two-stage” leaching，the leaching rate of magnesium and copper ion is more higher than unroasted ore，under the condition of ammonium sulfate concentration of 2.5 mol/L，pulp concentration of 30%，and leaching temperature of 50 ℃. After “roasting-leaching of calcium，magnesium and copper”，the leaching rate of gold was also greatly improved.Through the above process，the total leaching rates of calcium，magnesium，copper and gold can reach 96.18%，95.16%，80.51% and 78.86%，respectively，which improve the leaching rate and comprehensive economic value of valuable elements in high-alkaline copper-bearing gold deposits，and has the potential of popularization and application.

Key words: carbonate, high-alkaline, copper-bearing gold ore, roasting, leaching, comprehensive recovery

CLC Number:

TF11

Kaibin FU, Qiuhong ZHONG, Yu MAO, Lei WANG, Deliang TENG, Taotao ZHAO. Study on Comprehensive Recovery of Calcium，Magnesium，Copper and Gold from High-alkaline Copper-bearing Gold Ore in Sichuan Province[J].Gold Science and Technology, 2019, 27(5): 777-783.

Figures/Tables 10

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化学成分	w（B）	化学成分	w（B）	化学成分	w（B）
SiO₂	8.92	MgO	19.17	CuO	1.61
Fe₂O₃	26.06	CaO	40.10	Na₂O	0.03
SrO	0.02	BaO	0.08	PbO	0.02
Al₂O₃	0.83	K₂O	0.19	Sb₂O₃	0.45
SO₃	1.02	MnO	0.19	ZnO	0.10
P₂O₅	0.51	As₂O₃	0.67	Cl	0.03

Study on Comprehensive Recovery of Calcium，Magnesium，Copper and Gold from High-alkaline Copper-bearing Gold Ore in Sichuan Province

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