Jian-kang Wen

article

Mechanism of Mg²⁺ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

Jian-zhi Sun, Jian-kang Wen, Bo-wei Chen, Biao Wu

International Journal of Minerals, Metallurgy, and Materials > 2019 > 26 > 9 > 1069-1079

To inhibit the dissolution of Mg²⁺ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bi-oleaching factors on the dissolution of Mg²⁺ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most...

article

Mechanism of aluminum complexation in oxidative activity of leaching bacteria in a fluoride-containing bioleaching system

Xiang Li, Jian-Kang Wen, Xiao-Lan Mo, Wu Biao, more

Rare Metals > 2019 > 38 > 1 > 87-94

Accumulation of toxic ions in leachate is one factor limiting bioleaching applications. The effect of fluoride ions on the growth of bioleaching microorganisms has been extensively emphasized. In this study, HF is found to be the toxic form of fluoride that affects the bacterial activity under acidic conditions. The added aluminum could compete with H⁺ to complex with F⁻, thus significantly decrease...

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New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment

Xiao-bin Qiu, Jian-kang Wen, Song-tao Huang, Hong-ying Yang, more

International Journal of Minerals, Metallurgy, and Materials > 2017 > 24 > 10 > 1104-1111

To extract gold from a low-grade (13.43 g/t) and high-sulfur (39.94wt% sulfide sulfur) Carlin-type gold concentrate from the Nibao deposit, Guizhou, a bio-pretreatment followed by carbon-in-pulp (CIP) cyanide leaching process was used. Various methods were used to detect the low-grade gold in the concentrate; however, only time-of-flight secondary-ion mass spectrometry (TOF-SIMS) was successful. With...

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Comprehensive recovery of gold and base-metal sulfide minerals from a low-grade refractory ore

Wen-juan Li, Shuang Liu, Yong-sheng Song, Jian-kang Wen, more

International Journal of Minerals, Metallurgy, and Materials > 2016 > 23 > 12 > 1377-1386

The comprehensive recovery of small amounts of valuable minerals such as gold and base-metal sulfide minerals from a low-grade refractory ore was investigated. The following treatment strategy was applied to a sample of this ore: gold flotation–gold concentrate leaching–lead and zinc flotation from the gold concentrate leaching residue. Closed-circuit trials of gold flotation yielded a gold concentrate...

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Research progress in biohydrometallurgy of rare metals and heavy nonferrous metals with an emphasis on China

Jian-Kang Wen, Bo-Wei Chen, He Shang, Guo-Cheng Zhang

Rare Metals > 2016 > 35 > 6 > 433-442

In the past decade, progress in the field of biohydrometallurgy had been significant. A total of 17 novel biomining microorganisms were discovered, and eight copper heap bioleaching plants and 11 gold biooxidation plants were established or expanded. In this review, it was summarized the physiological properties of the newly isolated biomining microorganisms and three novel microbial ecological methods...

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Effect of CO₂ and N₂ on microbial community changes during column bioleaching of low-grade high pyrite-bearing chalcocite ore

Bo-wei Chen, Biao Wu, Xing-yu Liu, Jian-kang Wen

Journal of Central South University > 2015 > 22 > 12 > 4528-4535

Simulated heap bioleaching of low-grade high pyrite-bearing chalcocite ore was conducted at 40°C with aeration of CO₂ and N₂. Ore samples were collected at day 43, 64, 85, 106 and subjected to microbial community analysis by 16S rRNA gene clone library. Phylogenetic analyses of 16S rDNA fragments revealed that the retrieved sequences are mainly related to genus Acidithiobacillus, Leptospirillum and...

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Magnesium-rich gangue dissolution in column bioleaching of chalcopyrite

Xue Liu, Jian-Kang Wen, Biao Wu, Shuang Liu

Rare Metals > 2015 > 34 > 5 > 366-370

This study is to assess the effect of magnesium-rich gangue dissolution on the ore containing chalcopyrite and carrollite from Democratic Republic of the Congo (DRC). The ore contains 11.0 wt% magnesium and 2.4 wt% copper. When Mg²⁺ concentration is over 20 g·L⁻¹ after 2 months in column bioleaching, the redox potential of leachate keeps stable, much less than that when Mg²⁺ concentration is below...

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Sulfuric acid leaching of low-grade refractory tantalum–niobium and associated rare earths minerals in Panxi area of China

Biao Wu, He Shang, Jian-Kang Wen

Rare Metals > 2015 > 34 > 3 > 202-206

By mineral liberation analyzer (MLA) automated quantitative system, the niobium–tantalum ore in this study was classified as refractory mineral of low-grade which was mainly composed of fergusonite, polycrase, ilmenorutile, and bastnasite. Most of niobium and rare earth metals were disseminated in these minerals (particle sizes of 95 % rare earth elements <40 μm), which cannot be concentrated...

article

Control of redox potential by oxygen limitation in selective bioleaching of chalcocite and pyrite

Biao Wu, Jian-Kang Wen, Bo-Wei Chen, Guo-Cheng Yao, more

Rare Metals > 2014 > 33 > 5 > 622-627

Based on the bioleaching mechanism and electrochemical studies of metal sulfides, the dissolution rates of chalcocite and pyrite are controlled by redox potentials. Experiment on the bioleaching of chalcocite and pyrite under constant redox potential by sparging with nitrogen gas was demonstrated. By leaching at low and constant redox potential (<760 mV, vs SHE), copper recoveries of 90 %–98 %...

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Extraction of niobium, yttrium, and cerium from a low-grade niobium-bearing ore by roasting (NH₄)₂SO₄-Na₂SO₄-H₂SO₄ system

Wen-Cheng Gao, Jian-Kang Wen, Biao Wu, He Shang

Rare Metals > 2014 > 33 > 6 > 754-760

A novel process of extracting niobium, yttrium, and cerium from a low-grade niobium-bearing ore by the roasting (NH₄)₂SO₄-Na₂SO₄-H₂SO₄ system was experimentally studied. The influences of various factors, such as roasting temperature, roasting time, mass ratio of agents-to-ore and particle size fraction on the extraction of valuable metals were comprehensively investigated. It is found that the roasting...

article

Feasibility study on heap bioleaching of chalcopyrite

Bo-Wei Chen, Jian-Kang Wen

Rare Metals > 2013 > 32 > 5 > 524-531

Bioleaching of chalcopyrite often encountered the formation of passivation layer, which inhibited the leaching process and resulted in a low leaching rate. This inhibitory effect can be eliminated by thermophilic bioleaching. The industrial test of BioCOP technology based on thermophiles was successfully completed, which confirmed the feasibility of chalcopyrite bioleaching. However, industrial leaching...

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Chemical leaching mechanism of chalcopyrite with difference mineralization

Jing Bai, Jian-Kang Wen, Song-Tao Huang, Biao Wu

Rare Metals > 2013 > 32 > 1 > 63-66

This paper presents the effect of mineralization on chalcopyrite chemical leaching in very simple H₂SO₄ solution systems at pH 1.0, with 5 % chalcopyrite concentrate at 65 °C. The copper extractions after 12 days leaching of marine volcanic and porphyry chalcopyrite were 85.7 and 66.6 %, respectively. It was found that sulphur element formed on the surface of two samples as a result of XRD and SEM-EDAX,...

article

Influence of copper solvent extractant on microbial community structure of acidophilic microorganisms

Bo-wei Chen, Wen-juan Li, Xing-yu Liu, Gui-ying Zhou, more

Journal of Central South University > 2010 > 17 > 6 > 1196-1200

The influence of different concentrations of copper solvent extractant ZJ 988 on the growth and activity of acidophilic microorganisms was studied and the microbial community structures were compared by 16S rRNA gene clone library analysis. The total bacteria numbers are reduced when 0.5% (volume fraction) extractant is added. The proportions of Acidithiobacillus ferrooxidans and Acidiphilium organovorum...

article

Dominance of Acidithiobacillus at ore surface of Zijinshan commercial low-grade copper bioleaching heap

Xing-yu LIU, Bo-wei CHEN, Jian-kang WEN

Transactions of Nonferrous Metals Society of China > 2008 > 18 > 6 > 1506-1512

The microbial community structure in the ore surface of Zijinshan commercial low-grade copper bioleaching heap was investigated by 16S rRNA gene clone library. For both bacteria and Archaea, 105 clones were sequenced. The dominant bacteria species present in the ore surface were Acidithiobacillus and Leptospirillum, accounting for 51.42% and 48.57%, respectively. However, for the Archaea, only one...

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Search results for: Jian-kang Wen

Mechanism of Mg²⁺ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

Mechanism of aluminum complexation in oxidative activity of leaching bacteria in a fluoride-containing bioleaching system

New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment

Comprehensive recovery of gold and base-metal sulfide minerals from a low-grade refractory ore

Research progress in biohydrometallurgy of rare metals and heavy nonferrous metals with an emphasis on China

Effect of CO₂ and N₂ on microbial community changes during column bioleaching of low-grade high pyrite-bearing chalcocite ore

Magnesium-rich gangue dissolution in column bioleaching of chalcopyrite

Sulfuric acid leaching of low-grade refractory tantalum–niobium and associated rare earths minerals in Panxi area of China

Control of redox potential by oxygen limitation in selective bioleaching of chalcocite and pyrite

Extraction of niobium, yttrium, and cerium from a low-grade niobium-bearing ore by roasting (NH₄)₂SO₄-Na₂SO₄-H₂SO₄ system

Feasibility study on heap bioleaching of chalcopyrite

Chemical leaching mechanism of chalcopyrite with difference mineralization

Influence of copper solvent extractant on microbial community structure of acidophilic microorganisms

Dominance of Acidithiobacillus at ore surface of Zijinshan commercial low-grade copper bioleaching heap

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