复杂金精矿矿物特性及焙烧预处理工艺研究-有色金属（冶炼部分）.doc

PAGE  doi：10.3969/j.issn.1007-7545.2014.08.010 复杂金精矿矿物特性及焙烧预处理工艺研究 贺秀珍1，钟清慎1,2，马玉天1，刘玉强1,2 （1.金川集团股份有限公司 贵金属研究中心，甘肃金昌 737100；2.西安建筑科技大学 冶金工程学院，西安 710055） 摘要：对某复杂高砷金精矿进行了工艺矿物学研究，并考察了焙烧温度、时间和压缩空气流量对焙烧脱除砷、硫的影响。结果表明，该复杂金精矿为少硫化物型金精矿，主要矿物是黄铁矿、砷黄铁矿以及长石、石英等脉石矿物，金精矿中金主要以金单质或者金与硫（砷）化物、氧化物和脉石的包裹体存在。金颗粒粒径大多在1~3 μm，部分颗粒在1 μm以下，少数较大颗粒粒度可达4~5 μm。当控制焙烧的温度、时间和压缩空气流量分别为650 ℃、45 min、150 L/h时，砷、硫的脱除率分别达到97%和98%以上。 关键词：复杂金精矿；工艺矿物学；氧化焙烧；砷；硫 中图分???号：TF831;TD91 文献标志码：A 文章编号：1007-7545（2014）08-0000-00 Study of Mineral Characteristics and Roasting Pretreatment Technology of Complex Gold Concentrate HE Xiu-zhen1, ZHONG Qing-shen1,2, MA Yu-tian1, LIU Yu-qiang1,2 (1. Precious Metals Research Centre, Jinchuan Group Co., Ltd, Jinchang 737100, Gansu, China; 2. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China) Abstract: Process mineralogy of high arsenic bearing complex gold concentrate was investigated. The effects of roasting temperature and time, and compressed air flow on removal rates of arsenic and sulfur were studied. The results show that this complex gold ore concentrate contains fewer sulfides with main minerals of pyrite, arsenopyrite and gangue minerals such as feldspar and quartz. Gold in concentrate exists mainly as of element or gold and sulfur (arsenic) compound, oxide inclusions and gangue. Particle size of gold particles is mostly between 1~3 μm, part of particles is 1 μm, a few larger grain size can be up to 4~5 μm. Arsenic and sulfur removal rate is up to 97% and 98% above, respectively under the optimum conditions including roasting temperature of 650 ℃, roasting time of 45 min, and compressed air flow of 150 L/h. Key words: complex gold ore concentrate; process mineralogy; oxidizing roasting; arsenic; sulfur 随着易处理金精矿资源的枯竭，大量复杂难处理金精矿资源的综合利用具有越来越重要的意义。近年来的地质勘探工作表明，新发现的大中型金矿床大部分是复杂难处理金矿床，尤其是甘肃、青海、新疆和内蒙西部以及桂、滇、黔等地区发现或探明的金矿床主要是复杂高砷、高碳、微细浸染型金矿[1-4]。 复杂金精矿采用传统的常规氰化法提金工艺处理，金银回收率低[5-11]。因此，首先必须进行预处理。复杂金精矿的预处理工艺主要有焙烧预处理[12]、