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某难处理卡林型金矿选冶工艺研究
孙言鹏
Subtype硕士
Thesis Advisor叶树峰
2018
Degree Grantor中国科学院大学
Degree Discipline化学工程
Keyword卡林型金矿,重选,浮选,预处理,氰化浸出
Abstract

随着金矿资源的大量开采,易选冶的金矿数量越来越少,复杂难选金矿成为了现在黄金生产的主要资源,这类金矿因其以包裹、共生、伴生等复杂形式存在,采用常规选冶方法,金的回收率普遍较低。因此,如何有效提高金的回收率,并综合回收矿石中的其他有价元素成为了这类矿山企业亟待解决的重要课题。本研究以甘肃某典型复杂难处理卡林型金矿矿石为研究对象,在分析其不易处理的原因及其采用常规预处理方法的优缺点的基础上,针对该矿提出了先重选后浮选的重-浮联合选矿工艺,并针对金精矿提出了预处理-两段焙烧-再磨-氰化浸出的冶炼工艺;在此基础上,对选矿药剂的种类、用量,焙烧、氰化条件进行了优化。工艺矿物学研究结果表明,该矿金品位为5.92g/t,其中23.99%的金以次显微或微细包裹体形式赋存于黄铁矿、毒砂、辉锑矿等硫化矿物中,品位1.42g/t;8.45%的金呈微细包裹体形式赋存于褐铁矿、锑铁矿及石英等脉石矿物中,品位0.50g/t;其余67.57%的金呈裸露自然金金形式存在,品位4.00g/t。研究表明,该矿石中金的赋存状态复杂,回收难度大,采用单一回收方法难以取得理想的金回收指标。根据金的赋存状态及产出特征,对该矿采用原矿尼尔森离心机重选-浮选中矿再磨工艺流程,可获得金回收率86.03%,品位50.05 g/t的金精矿;金精矿再经预处理-两段焙烧-再磨-氰化浸出,可获得90.23%的浸出率,浮选尾矿直接氰化浸出可获得56.25%的浸出率,该矿经重选-浮选-各产品分别(焙烧)浸出后,最终金的综合回收率达到85.48%。;With the large-scale mining of gold resources, the number of gold mines that are easy to be smelted is becoming less and less, and complicated and difficult to be selected has become the main resource of gold at present. This kind of gold deposits exists in complex forms such as inclusion and symbiosis, adopt the conventional method of dressing, the recovery rate of gold is generally low. Therefore, how to improve the recovery rate of gold and comprehensively recover other valuable elements in ore has become an important research topic for this kind of mining enterprises.This study, taking the Carlin type of gold ore in Gansu as the research object, analyses why it is difficult to handle the gold ore with arsenic and antimony, and analyses its advantages and disadvantages of common pretreatment method, have been put forward the mineral separation process that pre-gravity-concentration after-flotation for the raw ore, put forward the smelting process that preprocessing-two-stage roasting-grinding-cyanide leaching for the gold concentrate. On the basis of this process, this paper optimized the type and quantity of the mineral processing agents, optimized the process of roasting and cyaniding, and obtained good experimental results.From the study of technological mineralogy, the ore contains Au 5.92g/t, among which 1.42g/t gold occurs in the form of sub-microscopic gold or micro inclusions in pyrite, toxic sand, stibnite and other sulfide minerals, and its share is 23.99%. 0.50g/t gold occurs in the form of a fine inclusion in the gangue minerals such as lignite, antimony ore and quartz, with a share of 8.45%. The remaining 4.00g/t gold exists in the form of bare gold, with a share of 67.57%. The occurrence state of gold in ore is complex and recovery is difficult. It is difficult to obtain ideal gold recovery index by single recovery method.According to the occurrence status and output characteristics of gold, the flotation of Nielsen centrifuge of raw ore and the regrinding process of ore in the gravity separation was adopted to obtain the gold recovery rate of 86.03% and the grade of 50.05 g/t. The leaching rate of gold concentrate was 90.23% after pretreatment - two-stage roasting - grinding - cyanide leaching, and 56.25% after direct cyanidation of flotation tailings. The final comprehensive recovery rate of gold reached 85.48% after the raw ore was leached by gravity separation - flotation - each product (roasting). 

Language中文
Document Type学位论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/40737
Collection中国科学院过程工程研究所
Recommended Citation
GB/T 7714
孙言鹏. 某难处理卡林型金矿选冶工艺研究[D]. 中国科学院大学,2018.
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