某高硫金精矿选冶试验研究

发布时间：2018-08-01 16:21

【摘要】：随着黄金矿物资源不断被开发利用,天然黄金矿物资源不断减少,而含金二次资源的加工利用,不仅可以满足人类社会的发展对黄金资源的需求,同时可以减少环境污染。某高硫含金精矿原料中金、硫品位分别为11.80 g/t和30.53%,由金的物相分析结果可知,硫化物包裹金60.82%,对原矿直接进行氰化金的浸出率较低,如直接氰化处理生产成本较高,经济上不合理。本课题经过系统的试验研究,对该金精矿采用再选工艺,获得高质量的金精矿和硫精矿,再对金精矿进行氰化浸出金。本课题根据该高硫金精矿的工艺矿物学研究结果,分别进行全浮选工艺流程和重-浮联合工艺流程进行探索试验,最终确定采用全浮选工艺流程,即采用磨矿细度-0.074 mm占78-80%的全浮选选矿工艺富集金、硫的选矿工艺,获得金精矿产率为7.21%,金品位为129.69g/t,金回收率为88.63%;硫精矿产率为62.34%,其金、硫品位分别为1.80 g/t和47.99%,金、硫选矿回收率分别为10.62%和91.90%。对浮选金精矿进行氰化浸出试验,试验获得的最佳条件为:再磨细度-0.044 mm占95%,矿浆浓度33%,石灰用量8000 g/t,碱预浸30分钟,氰化物用量12000 g/t,浸出时间24 h,金浸出率可以达到96.39%。金、硫的选冶总回收率分别为85.43%和91.90%,选冶效果比较理想。研究结果表明:采用金精矿再磨-浮选富集金硫-浮选金精矿氰化提金选冶工艺,能有效打开硫化物及部分脉石对金的包裹,减少氰化浸出和焙烧成本。本课题通过大量的试验,最终获得该高硫金精矿综合回收的最有效、最经济的回收方案,实现有价元素的综合回收,具有重要的经济意义。
[Abstract]:With the development and utilization of gold mineral resources, the natural gold mineral resources are decreasing, and the processing and utilization of the secondary resources containing gold can not only meet the needs of the development of human society for gold resources, but also reduce the environmental pollution. The grade of gold in a high sulfur gold concentrate is 11.80 g / t and 30.53, respectively. From the results of the phase analysis of gold, it can be seen that the leaching rate of gold cyanide directly from the original ore is lower, such as the higher production cost of direct cyanide treatment. Economically unreasonable. Through systematic test and study, the gold concentrate is reseparated to obtain high quality gold concentrate and sulfur concentrate, and then cyanide leaching of gold concentrate is carried out. According to the mineralogical research results of the high sulfur gold concentrate, the whole flotation process and the combined heavy floatation process were studied and tested respectively, and the whole flotation process was finally determined. That is to say, the whole flotation dressing process with grinding fineness -0.074 mm accounting for 78-80% was used to concentrate gold and sulfur. The gold concentrate ore rate was 7.21, the gold grade was 129.69 g / t, the gold recovery was 88.63%, the sulfur concentrate yield was 62.34%, the gold and sulfur grade were 1.80 g / t and 47.99%, respectively. The recoveries of sulfur are 10.62% and 91.90%, respectively. The cyanide leaching test of flotation gold concentrate was carried out. The optimum conditions were as follows: regrinding fineness -0.044 mm to 95%, pulp concentration 33, lime dosage 8000 g / t, alkali pre-leaching 30 minutes, cyanide dosage 12000 g / t, leaching time 24 h, gold leaching rate up to 96.39. The total recovery of gold and sulfur were 85.43% and 91.90% respectively. The results show that the cyanide extraction process of gold concentrate by regrinding and flotation of gold concentrate can effectively open the encapsulation of gold with sulphide and some gangue, and reduce the cost of cyanide leaching and roasting. Through a large number of experiments, this paper finally obtains the most effective and economical recovery scheme of the high sulfur gold concentrate, and realizes the comprehensive recovery of valuable elements, which has important economic significance.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD953

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