摘要
为了降低某薄矿脉型金矿石的选别成本,考查在入磨前设置预选抛废的可行性,在对代表性样品进行系统工艺矿物学特性及XRT感应特征研究与XRT预选试验的基础上,基于XRT图像灰度级分布范围和最高峰分布范围,对金矿石品位进行精准分类。进行了不同粒级、不同抛废率的矿石预选条件试验,确定了该金矿石适宜的预选粒级,并采用C1500XRT预选设备进行了抛废扩大试验。研究结果表明,该矿石金品位为1.23 g/t、硫含量1.50%,主要脉石矿物为长石和石英,矿石属于低品位贫硫化物石英脉型金矿石。金矿物的嵌布粒度极不均匀,大部分小于0.074 mm,主要为粒间金,其次为包裹金和少量的裂隙金,与黄铁矿等硫化物密切共生。针对10~60 mm粒级,在作业抛废率76.51%的条件下,将预选精矿与-10 mm粒级合并,Au回收率为95.84%,废石金品位为0.11 g/t,预选富集比为4.03,抛废效果良好。研究结果对降低该金矿石的选矿成本具有指导意义。
In order to reduce the separation cost of a thin vein type gold ore and examine the feasibility of setting pre-concentration and discarding before grinding,based on the systematic process mineralogy characteristics of representative sam-ples and XRT induction characteristics study and XRT pre-concentration test,the grade of gold ore is accurately classified based on the gray level distribution range and the highest peak distribution range of XRT image.The pre-concentration condi-tions of ore with different particle sizes and different discarding rates are tested,and the suitable pre-concentration particle size of the gold ore is determined.The C1500XRT pre-concentration equipment is used to carry out the expanded test of discarding.The results show that the gold grade of the ore is 1.23 g/t,the sulfur content is 1.50%,the main gangue minerals are feldspar and quartz,and the ore belongs to low grade poor sulfide quartz vein type gold ore.The disseminated particle size of gold miner-als is extremely uneven,most of which are less than 0.074 mm,mainly intergranular gold,followed by encapsulated gold and a small amount of fissure gold,which are closely associated with sulfides such as pyrite.For the 10~60 mm fraction,under the condition of 76.51%discarding rate,the pre-concentration concentrate is combined with the-10 mm fraction,the Au recovery rate is 95.84%,the gold grade of waste rock is 0.11 g/t,and the pre-concentration enrichment ratio is 4.03.The discarding effect is good.The research results have guiding significance for reducing the beneficiation cost of the gold ore.
作者
晏丽鑫
李丽匣
李思佑
张宏亮
张晨
YAN Lixin;LI Lixia;LI Siyou;ZHANG Hongliang;ZHANG Chen(School of Resources and Civil Engineering,Northeast University,Shenyang 110819,China;Ganzhou HPY Technology Co.,Ltd.,Ganzhou 341000,China;Nuclear Industry Beijing Chemical Metallurgical Research Institute,Beijing 101149,China)
出处
《金属矿山》
北大核心
2024年第12期205-210,共6页
Metal Mine
基金
国家重点研发计划项目(编号:2022YFC2903802)。
关键词
预选
抛废
金矿石
图像分析
XRT分选
pre-concentration
discarding
gold ore
image analysis
XRT separation
