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用化学物相法并结合物理选矿及微束分析研究了丫他微细浸染型金矿床中金的赋存形式,测定了各种形式所占的比例。表明金主要呈超细微粒子的单质附着于黄铁矿等硫化矿物的表面及裂隙面上。用水解还原法配制含纳米金单质的溶液,研究了不同矿物对其中纳米金粒子的吸附作用,表明硫化物类矿物普遍具有较强的吸附能力,与地质观察的结果很一致。金可以呈纳米级微粒单质存在于溶液中,构成胶体体系并随之运移。在遇有早期晶出或早已存在的硫化物、自然铜及炭质岩石时,金可以被吸附而富集成矿,可解释微细浸染型金矿的成因。
By means of chemical phase method combined with physical beneficiation and microbeam analysis, the forms of gold in the Ahdarn finely disseminated gold deposit were studied and the proportions of various forms were determined. Indicating that the main gold particles are superfine particles attached to pyrite and other sulfide minerals on the surface and fracture surface. Hydrolytic reduction method was used to prepare gold-containing single element solution. The adsorption of gold nanoparticles on different minerals was studied. It shows that sulfides minerals generally have strong adsorption capacity, which is consistent with the result of geological observation. Gold can exist in solution as nanoscale particulate matter, forming a colloidal system and migrating therewith. Gold can be adsorbed and enriched for mineralization in the event of early crystallized or pre-existing sulfides, natural copper and carbonaceous rocks, explaining the genesis of the finely disseminated gold deposit.