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15 results on '"Ruan, Ren Man"'

8. Study on oxidation of chalcocite.

Author

Wu Biao, Ruan Ren-Man, Wen Jian-Kang, Zhou Gui-Ying., Wu Biao, Ruan Ren-Man, Wen Jian-Kang, and Zhou Gui-Ying.

Abstract

The oxidation of chalcocite was studied during sulphuric acid leaching, ferric sulphate leaching and bioleaching by measuring the pH, redox potential and leaching rate under various conditions. The results showed that oxidation was accelerated in the ferric sulphate and bacterial leaching processes. The highest Cu leaching rates were 42% in acid and 67% in ferric sulphate solutions within 20 days, while the bioleaching rate reached 90%., The oxidation of chalcocite was studied during sulphuric acid leaching, ferric sulphate leaching and bioleaching by measuring the pH, redox potential and leaching rate under various conditions. The results showed that oxidation was accelerated in the ferric sulphate and bacterial leaching processes. The highest Cu leaching rates were 42% in acid and 67% in ferric sulphate solutions within 20 days, while the bioleaching rate reached 90%.

Published
2008

13. Copper sulphide dump bioleaching in Fujian Zijin Mining Industry Corporation.

Author

Li Hong-Xu, Chen Jing-He, Ruan Ren-Man, Wang Dian-Zuo., Li Hong-Xu, Chen Jing-He, Ruan Ren-Man, and Wang Dian-Zuo.

Abstract

The results are presented of commercial-scale dump bioleaching tests on secondary copper sulphide. The results showed that a leaching rate of 40% was achieved by dump bioleaching for 1 000 hours, and 75 % recovery over half a year. The dump bioleaching of secondary copper sulphide as chalcocite and covellite occurs in two stages. The leaching rate is faster in the first stage than in the second., The results are presented of commercial-scale dump bioleaching tests on secondary copper sulphide. The results showed that a leaching rate of 40% was achieved by dump bioleaching for 1 000 hours, and 75 % recovery over half a year. The dump bioleaching of secondary copper sulphide as chalcocite and covellite occurs in two stages. The leaching rate is faster in the first stage than in the second.

14. Pure pentlandite leaching with moderate thermophile.

Author

Deng Jing-Shi, Ruan Ren-Man., Deng Jing-Shi, and Ruan Ren-Man.

Abstract

It was found that while acid leaching of pentlandite for 8 days only dissolved 12.48% of the nickel, bacterial leaching with Sulphobacillus thermosulphidooxidans extracted up to 44.41% and with the addition of yeast extract as much as 63.67%. The optimum leaching conditions were pH 2.0, 10% inoculation and 0.02% yeast extract., It was found that while acid leaching of pentlandite for 8 days only dissolved 12.48% of the nickel, bacterial leaching with Sulphobacillus thermosulphidooxidans extracted up to 44.41% and with the addition of yeast extract as much as 63.67%. The optimum leaching conditions were pH 2.0, 10% inoculation and 0.02% yeast extract.

15. Column bioleaching of low grade copper sulfide ore at extreme conditions for most mineral processing bacteria

Author

Gang Zou, Zeng Ling Wu, Stefano Papirio, Xiao Kang Lai, Jaakko A. Puhakka, Lai Chang Zou, Ren Man Ruan, Zou, Gang, Wu, Zeng Ling, Lai, Xiao Kang, Zou, Lai Chang, Ruan, Ren Man, Papirio, Stefano, and Jaakko, Puhakka

Subjects
Metallurgy, General Engineering, Temperature, chemistry.chemical_element, Acid mine drainage, Copper, Copper sulfide, chemistry.chemical_compound, Secondary copper sulfide, Copper extraction techniques, chemistry, Column bioleaching, Bioleaching, Oxidizing agent, Aeration, Leaching (metallurgy), Nuclear chemistry
Abstract

This study is prompted by the high leaching efficiency of Zijinshan copper bio-heap leaching industrial plant. Bioleaching columns with 100 mm diameter and 1 m height were used to investigate copper bioleaching at different operating conditions. Elevated temperature, high total iron concentration and high acidity significantly increased copper leaching rate as determined by solution and residue assays. At 60 °C with 50 g/L iron (initial Fe3+/Fe2+ gram ratio 2.5), pH 1.0 and no aeration, copper extraction was achieved 90% after 60 days. However, at 30°C, 5 g/L total Fe, pH 1.5 and no aeration, copper extraction reached 80% and 85% after 90 and 200 days, respectively. Real-time PCR assay showed that only 105 cells/ml and 2×105 cells/g are in solution and on the ore surface at the condition of 60 °C 50 g/L iron and pH 1.0, respectively. In addition, a similar leaching rate was observed in the tests with and without inoculation. The column without inoculation was directly irrigated with acid mine drainage (AMD). Our results indicate high copper leaching efficiency at extreme conditions for mineral oxidizing bacteria. Inoculation and aeration are not necessary in Zijinshan copper mine bio-heap leaching process.

Published
2013

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