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of more breakpoints in the AuCN chain and remain in separate particles which doesn’t form compact spread covering, i.e., surface activated area. Key words: gold; cyanide; gold cyanidation; surface...发生了不同程度的溶解.相比之下,凹,凸部位的溶解程度明显大于平滑表面的溶解程度.说明金片表面溶解主要发生在棱,角等边界断点上,形成点蚀甚至缝隙腐蚀[7]. 图1 金片溶蚀前后的SEM像 Fig. 1 SEM images of gold surface before(a) and after(b) cyanidation 为进一步深入研究表面溶蚀状态,利用AFM轻敲模式测......
Introduction Gold is highly contaminated and encapsulated in sulfide matrix in refractory gold ores, and the extraction efficiency of gold by direct cyanidation leaching is low because..., BADRI R, ZAMANKHAN P. Improved recovery of a low-grade refractory gold ore using flotation– preoxidation–cyanidation methods [J]. International Journal of Mining Science and Technology, 2014, 24(4......
categorized into two types: non-refractory (fine milling) gold ores, in which most of the gold can be recovered by direct cyanidation, and refractory gold ores, which require pretreatment before cyanidation [1, 2]. As gold resources continue to be mined, mines that are easy to treat are decreasing, and re-factory gold mines will become the main resources of the gold industry in the future [3-6......
with activated carbon, while the humic acid forms complex with gold by functional groups [14-18]. Generally, if the content of organic carbon is above 0.2%, it will seriously disturb gold extraction cyanidation.... In the first stage, chemolithotrophic bacteria were used to oxidize sulfides, and cyanidation resulted in 81.1% gold extraction. The action of Streptomyces setonii caused reduction of carbonaceous matter......
extraction rate occurred during cyanidation. Secondly, the carbonaceous matter was destroyed by Streptomyces setonii, and the cyanide leaching rate of gold was increased from 81.10% to 94.70...] REES K L, van DEVENTER J S J. Preg-robbing phenomena in the cyanidation of sulphide gold ores [J]. Hydrometallurgy, 2000, 58(1): 61-80. [3] HAUSEN D M, BUCKNAM C H. Study of preg-robbing......
-acid dissociable cyanides) discharge are being tightened by local governments worldwide due to its high toxicity and volatility [5]. Thus, the disposal of cyanide-containing wastes from the cyanidation... decomposition with ferric oxide addition was examined with the purpose to elucidate the potential use of the thermal decomposition for destructing cyanide-containing solid wastes from gold cyanidation......
, ROCA A. Alkaline decomposition-cyanidation kinetics of argentian natrojarosite[J]. Hydrometallurgy, 1998, 49(3): 323?336. [23] ROLA A, VINALS J, ARRANZ M, CALERO J. Characterization and alkaline decomposition-cyanidation of beudantite-jarosite materials from Rio Tinto ores[J]. Canadian Metallurgical Quarterly, 1999, 38(2): 93?103. [24] SALINAS E, ROCA A, CRUELLS M, PATINO F, CORDOBA D......
that is naturally resistant to recovery by conventional cyanidation and carbon adsorption processes. Typical gold-silver refractory concentrate, where precious metals are found encapsulated with sulfides, requires pretreatment such as roasting[1-2], biological oxidation[3-4] and pressure oxidation[5-7] before cyanidation[8]. Pretreatment of refractory gold ores by ozone is a better alternative......
, YE Shu-feng. Present situation and prospect of recovering valuable elements from cyanidation tailing[J]. Journal of Chemical Industry and Engineering, 2016, 67(4): 1079-1089. [6] GUO Bao, PENG Yong..., 邹 尚, 陈 俊, 彭 竣. 氰化尾渣中金的回收及无害化处理试验研究[J]. 黄金, 2016, 37(11): 58-61. XIE Kun, ZOU Shang, CHEN Jun, PENG Jun. Experimental study on recovering gold from cyanidation tailings and biosafety disposal[J]. Gold......
and bromide have been proposed. Among them, ammoniacal thiosulphate leaching is considered a promising and nontoxic alternative to cyanidation [2]. The thiosulphate leaching and recovery of gold have... Engineering, 2001, 14(2): 135-174. [3] LI J, DABROWSKI B, MILLER J D, ACAR S, DIETRICH M, LEVIER K M, WAN R Y. The influence of pyrite pre-oxidation on gold recovery by cyanidation [J]. Minerals......