Experimental Study on Stage Grinding and Stepwise Flotation of a Gold Ore in Inner Mongolia

REN Hui; LIU Jie; WANG Xun; YANG Xinhua

doi:10.13779/j.cnki.issn1001-0076.2021.02.014

2021 Vol. 41, No. 2

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REN Hui, LIU Jie, WANG Xun, YANG Xinhua. Experimental Study on Stage Grinding and Stepwise Flotation of a Gold Ore in Inner Mongolia[J]. Conservation and Utilization of Mineral Resources, 2021, 41(2): 106-111. doi: 10.13779/j.cnki.issn1001-0076.2021.02.014

Citation:

REN Hui, LIU Jie, WANG Xun, YANG Xinhua. Experimental Study on Stage Grinding and Stepwise Flotation of a Gold Ore in Inner Mongolia[J]. Conservation and Utilization of Mineral Resources, 2021, 41(2): 106-111. doi: 10.13779/j.cnki.issn1001-0076.2021.02.014

Experimental Study on Stage Grinding and Stepwise Flotation of a Gold Ore in Inner Mongolia

1.
School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
2.
Shandong Gold Smelting Co., Ltd, Yantai 26144, China

Received Date: 18 March 2021

Publish Date: 25 April 2021

Abstract

Abstract

In a gold mine in Inner Mongolia, the gold grade in the raw ore is 2.83 g/t. The gold occurred as fine disseminated particles in gold ore, and the embedding relationship between gold and gangue minerals was close, indicating the recovery of gold minerals was difficult. In order to realize the effective concentration of the gold ore, the process flow of stage grinding and separation was determined on the basis of process mineralogy tests, and the flotation condition tests were carried out. Results demonstrated that the gold ore contains a slight amount of precious minerals such as electrum and hessite. The main gold-bearing minerals are pyrite and pyrrhotite. The gold content in pyrite was 62.20 g/t and distribution 41.61%, and that in pyrrhotite was 32.30 g/t and 23.77%. The gangue minerals mainly were quartz, epidote, chlorite, feldspar and mica. The flotation test results showed that the concentrate with gold grade of 38.00 g/t and recovery of 80.06 % was obtained under using butyl xanthate + butylamine dithiophosphate as main collector and 5460 as auxiliary collector, and the first stage grinding fineness of -0.074 mm 90% and the second stage grinding fineness of -0.038 mm 75% with closed-circuit flowsheet containing two roughing, two cleaning and three scavenging, and the middling returned in sequence. In addition, compared with the original flotation process, the gold grade and recovery of concentrate were increased by 13.8% and 6.75%, respectively.
- gold ore /
- stage grinding /
- flotation /
- concentration

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