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本文简要的评述了氧在金矿石、金精矿等给料氰化浸出中的作用。当金主要以元素状态(Au~0)存在时,其氧化对金在氰化物浸出剂中的溶解是极其重要的。在高pH下,氰化作用对用轻度氧化剂(如空气或氧)氧化Au是有利的。除金的氧化之外,通过向浸出矿浆中预先通入空气或氧(即预先充氧法)可减轻可溶性硫酸盐、砷酸盐、锑酸盐对金氰化的影响。如果由于金包裹在硫酸盐、硅酸盐、碲化物等矿物中而难处理时,则通氧焙烧或在氧压下浸出,就可使金离析出来。最新的文献资料指出,氰化期间由H_2O_2、Na_2O_2、CaO_2或O_3提供的活性氧能显著加速金的氧化-氰化作用,并在非常短的浸出时间内获得较高的金回收率。由本文资料可得出的结论是:在用氰化物浸出剂溶解金的过程中,氧起到极其重要的作用。
This article briefly reviews the role of oxygen in cyanide leaching of feedstocks such as gold ore and gold concentrate. When gold is mainly present in the elemental state (Au ~ 0), its oxidation is extremely important for the dissolution of gold in the cyanide leaching agent. At high pH, cyanidation is advantageous for oxidizing Au with mild oxidants, such as air or oxygen. In addition to oxidation of gold, the effect of soluble sulfate, arsenate, antimonate on cyanidation can be mitigated by pre-aeration of air into the leached slurry (ie, pre-aeration). If the gold wrapped in sulfate, silicate, telluride and other minerals and difficult to deal with, then through oxygen roasting or leaching under oxygen pressure, you can make gold out. Recent literature suggests that the active oxygen provided by H 2 O 2, Na 2 O 2, CaO 2 or O 3 during cyanidation can significantly accelerate the oxidation-cyanidation of gold and obtain higher gold recovery in a very short leaching time. From the data in this paper it can be concluded that oxygen plays an extremely important role in the dissolution of gold with cyanide leaching agents.