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用几种静态预测方法研究了来自云浮硫铁矿矿石的产酸潜力,并结合动态浸滤试验方法对比了新旧矿石的氧化过程及产酸的动力学特征.静态预测结果表明:该矿矿石的净中和酸潜力NNP<-20、中和酸能力与产酸潜力比NP/AP<1:1、静产酸量NAG>10、NAG-pH<4,是强产酸矿.连续25周的动态浸滤试验研究表明:受碳酸盐控制,新矿浸滤液的pH值在7.46—6.45呈缓慢下降的趋势,25周内减小了近1个pH单位;旧矿已经产酸,浸滤液初期pH<4,10周内迅速下降到pH<3,体系氧化性及硫化物的氧化速率远远高于新矿,金属的释放大大增加.
The potential of acid production from the Yunfu pyrite ore was studied by several static prediction methods, and the oxidation process and the kinetic characteristics of acid production were compared with the dynamic leaching test.The static prediction results show that the ore ores Net neutralizing acid potential NNP <-20, neutral acid capacity and acidogenic potential than NP / AP <1: 1, acid yield NAG> 10, NAG-pH <4, The results of dynamic leaching experiments showed that the pH value of the new leachate showed a slowly decreasing trend from 7.46 to 6.45 under carbonate control and nearly one pH unit within 25 weeks. The initial pH of the filtrate decreased rapidly to pH <3 within 10 min, and the oxidation rate of the system and the oxidation rate of sulfides were much higher than that of the new ore. The release of metal greatly increased.