新型组合捕收剂强化毒砂浮选机理研究  

Mechanism study on enhancing flotation performance of arsenopyrite ore under newly combined collector system

作　　者：杨慧 王振[1] Safarov Sayfidin 赵开乐[3] Yang Hui;Wang Zhen;Safarov Sayfidin;Zhao Kaile(Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education,Southwest University of Science and Technology,Mianyang Sichuan 621010,China;Institute of Chemistry,Tajikistan Academy of Sciences,Dushanbe 734063,Tadjikistan;Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Chengdu Sichuan 610042,China)

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010 [2]塔吉克斯坦科学院化学研究所,杜尚别734063 [3]中国地质科学院矿产综合利用研究所,四川成都610042

出　　处：《化工矿物与加工》2022年第7期18-22,共5页Industrial Minerals & Processing

基　　金：四川省科技厅重点研发项目(2021YFG0269,2022YFQ0074)。

摘　　要：青海某金矿的主要载金矿物为毒砂,现场采用酸性条件下的异戊黄药捕收体系进行富集,存在酸耗大、设备腐蚀、硫化矿溶解等问题,为此对弱碱性条件下正十二烷基硫醇与异戊黄药组合使用强化毒砂捕收的机理及初步应用进行了研究。毒砂纯矿物浮选试验结果表明,异戊黄药对毒砂的捕收能力略优于正十二烷基硫醇,在异戊黄药体系中加入适量正十二烷基硫醇可以在总捕收剂用量较低的情况下,获得较高的毒砂回收率。接触角测试结果显示,正十二烷基硫醇和异戊黄药均能使毒砂矿物表面的疏水性提高,浓度分别为5×10^(-5)、1×10^(-4) mol/L的正十二烷基硫醇和异戊黄药组合使用可使毒砂矿物表面的接触角(69.18°)高于单独使用浓度为2×10^(-4) mol/L的异戊黄药的毒砂矿物表面的接触角(64.36°)。红外光谱检测结果表明,正十二烷基硫醇和异戊黄药均在毒砂矿物表面发生了化学吸附,二者组合使用时这种吸附作用更强,捕收剂吸附量更大。针对原矿金品位为4.48 g/t的某金矿石,基于该组合捕收剂的药剂体系,可以在pH为9的弱碱性条件下以较低的总捕收剂用量获得金回收率为92.44%的选别效果,优于酸性条件下单独使用异戊黄药的捕收效果。Arsenopyrite is the principal gold-bearing mineral in a gold mine in Qinghai province.Isoamylxanthate was usually used as the collector for upgrading the arsenopyrite ore under acidic conditions in the mineral processing plant presenting such problems as high acid consumption,equipment corrosion and dissolving sulfide ore.The mechanism and preliminary application of the collector combining N-dodecyl mercaptan and isoamylxanthate to enhance the flotation behavior of arsenopyrite under weak alkali conditions were studied.The results from flotation tests on the pure arsenopyrite minerals show that the performance of isoamylxanthate was better than N-dodecyl mercaptan as the collector for flotation of arsenopyrite,and addition of appropriate amount of N-dodecyl mercaptan to isoamylxanthate system was likely to achieve higher recovery of arsenopyrite with a lower total collector consumption.The contact angle tests indicated that both N-dodecyl mercaptan and isoamylxanthate could improved the hydrophobicity of arsenopyrite mineral surface,and the addition of combined N-dodecyl mercaptan at concentration of 5×10^(-5) mol/L and isoamylxanthate at concentration of 1×10^(-4) mol/L presented higher contact angle of 69.18°than that of 64.36°by adding only isoamylxanthate at concentration of 2×10^(-4) mol/L to the pulp.The infrared spectroscopy results indicated that each reagent made chemical adsorption take place on the surface of arsenopyrite.The collector with combination of N-dodecyl mercaptan and isoamylxanthate performed higher adsorption effect.When processing a raw gold ore with Au grade of 4.48 g/t,the Au recovery of 92.44%can be achieved at pH 9 under weak alkali conditions with a low consumption of combined collector for which the beneficiation performance was better than that using isoamylxanthate only as the collector under acidic conditions.

关 键 词：毒砂 金矿 混合捕收剂 吸附 接触角 疏水性 

分 类 号：TD913[矿业工程—选矿]