New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment
| Autor: | Jian-kang Wen, Mei-lin Liu, Biao Wu, Xiao-bin Qiu, Song-tao Huang, Hong-ying Yang |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Sulfide Mechanical Engineering Extraction (chemistry) Metals and Alloys chemistry.chemical_element 02 engineering and technology engineering.material 010502 geochemistry & geophysics 01 natural sciences Sulfur 020501 mining & metallurgy 0205 materials engineering Recovery rate chemistry Geochemistry and Petrology Mechanics of Materials Jarosite Materials Chemistry engineering Gangue Pyrite Carbonaceous matter 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | International Journal of Minerals, Metallurgy, and Materials. 24:1104-1111 |
| ISSN: | 1869-103X 1674-4799 |
| DOI: | 10.1007/s12613-017-1501-7 |
| Popis: | 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 bio-pretreatment, the gold recovery rate increased by approximately 70.16% compared with that obtained by direct cyanide leaching of the concentrate. Various attempts were made to increase the final gold recovery rate. However, approximately 20wt% of the gold was non-extractable. To determine the nature of this non-extractable gold, mineralogy liberation analysis (MLA), formation of secondary product during the bio-pretreatment, and the preg-robbing capacity of the carbonaceous matter in the ore were investigated. The results indicated that at least four factors affected the gold recovery rate: gold occurrence, tight junctions of gold-bearing pyrite with gangue minerals, jarosite coating of the ore, and the carbonaceous matter content. |
| Databáze: | OpenAIRE |
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