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某金矿石Au的品位为2.54 g·t-1,矿石以氧化矿为主,矿石中金嵌布粒度极细,与脉石互相包裹,难以解离,属于难浸类金矿石。石硫加碱催化合剂是一种混合型浸金药剂,它是以石硫合剂为基本组分,加入了稳定剂(亚硫酸钠等)与抗硫系(如S,As等)干扰剂(铜氨络离子)等,使用起来比石硫合剂方便。对矿石进行了石硫加碱催化合剂法搅拌浸金研究,考察了磨矿细度、氧化剂种类、H2O2浓度、矿浆pH、搅拌时间对金浸出率的影响。相比KMnO4,CaO2等氧化剂相比,H2O2具有浸金率高,工业生产操作方便等优点。确定最优实验条件为:液固比为2.0,磨矿细度-74μm占91%,所用氧化剂为H2O2,浓度为0.02 mol·L-1,pH值为12～13,搅拌时间为3.5～4.0 h,此条件下金浸出率可达72.6%。浮选法及氰化浸金法中金的回收率分别为70.5%和68.1%。与浮选法、氰化浸金方法比较,此方法具有药剂廉价易得、工艺简单、环保等优点,可望成为黄金提取的主要方法之一。
Au grade of a gold ore is 2.54 g · t-1. Ore is mainly composed of oxide ore. The gold inlaid ore is very fine in grain size and is mutually encased with gangue and is difficult to dissociate. It belongs to the difficult-to-dip gold ore. It is a mixed type gold-leaching agent, which is based on the stone sulfur mixture as the basic component, adding stabilizer (such as sodium sulfite) and anti-sulfur (such as S, As) Ions), etc., to use more convenient than lime sulfur. The ore was subjected to the stone sulfur plus alkali catalyst mixture method stirring leaching gold study grinding fineness, oxidant species, H2O2 concentration, pulp pH, stirring time on the gold leaching rate. Compared with KMnO4, CaO2 and other oxidants, H2O2 has the advantages of high gold-impregnation rate and convenient industrial production. The optimal experimental conditions were determined as follows: the liquid-solid ratio was 2.0, the fineness of grinding -74μm was 91%, the oxidant used was H2O2, the concentration was 0.02 mol·L-1, the pH was 12-13 and the stirring time was 3.5-4.0 h, gold leaching rate of 72.6% under this condition. The recoveries of flotation and cyanidation gold were 70.5% and 68.1%, respectively. Compared with the flotation method and the cyanide leaching method, this method has the advantages of cheap and easy to get medicine, simple process and environmental protection, and is expected to be one of the main methods for gold extraction.