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Research Progress on Carbonaceous Matters and Its “Preg-robbing” Mechanism in Carbonaceous Gold Ores
Received date: 2021-07-14
Revised date: 2021-11-19
Online published: 2022-06-17
The carbonaceous matters in carbonaceous gold ores can adsorb the gold dissolved in the process of cyanide leaching，which seriously affects the recovery of gold and is one of the most important troubles in gold processing.Various pretreatment methods have been used to eliminate the harmful effects of carbonaceous matters in gold leaching processes.Due to the characteristics of carbonaceous matters such as fine particle size，wide distribution range of particle size，complex compositions and difficulty on separation，there are few achievements of in-depth research on carbonaceous matters in carbonaceous gold ores at home and abroad.The main research tends to the development and optimization of the pretreatment processes of carbonaceous gold ores.Some new discoveries have enriched the scientific understanding of carbonaceous matters.Many kinds of substances can absorb gold in leaching process，but in the presence of carbonaceous matters，the absorb ability of other substances is often ignored.Among these carbonaceous matters，organic carbon and elemental carbon with pore structure which is similar to activated carbon have strong “preg-robbing” ability.The compositions of organic carbon have not been determined so far，but the discovery of kerogen further sheds light on the compositions of organic carbon and the geological conditions under which it formed.The kerogen are an important gold-containing carrier in the form of porous powder and solid particles.The discovery of kerogen provides a new idea for the removal of organic carbon.The pore structure has been found to be a strong condition for carbonaceous matters to absorb gold.The conclusion that destroying the pore structure can reduce the “preg-robbing” ability of carbonaceous matters further proves the view that carbonaceous matters with pore structure can adsorb the dissolved gold.The complexation between humic acid and metal ions also provides a reference for the “preg-robbing” theory of organic carbon.Some studies have found that carbonaceous matters affect gold leaching process not only by the “preg-robbing” ability，but also due to the surface coating of gold by carbonaceous mattes in the grinding process，which seriously affects gold leaching.There are great differences in the ability of carbonaceous matters to absorb gold from different ores，which are mainly reflected in the different carbonaceous matters species，maturity grade and grinding fineness.These conclusions are of great significance to the study of carbonaceous matters.As a result，this paper summarizes and analyzes the classical theory and latest researches on the material composition，“preg-robbing” mechanism of carbonaceous matters and influence factors of “preg-robbing” ability in the carbonaceous gold ores，points out the research directions of “preg-robbing” mechanism，and provides an important reference for the selection of pretreatment technology of carbonaceous gold ores.
Xinwei ZHANG , Yonghui SONG , Ping DONG , Ning YIN , Long LIAO , Panpan ZHANG . Research Progress on Carbonaceous Matters and Its “Preg-robbing” Mechanism in Carbonaceous Gold Ores[J]. Gold Science and Technology, 2022 , 30(2) : 302 -312 . DOI: 10.11872/j.issn.1005-2518.2022.02.093
http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-2-302.shtml
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