高硫磁铁矿精矿在低碱条件下脱除磁黄铁矿的浮选试验及机理分析  

Experimental and Mechanism Study on Flotation for Pyrrhotite Removal from High-Sulfur Magnetite Concentrate under Low Alkali Conditions

作　　者：蒋旺强 罗溪梅[1,2,3] 吴雪僮 贾蕗繁 洪欣 王云帆 JIANG Wangqiang;LUO Ximei;WU Xuetong;JIA Lufan;HONG Xin;WANG Yunfan(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Clean Utilization of Complex Non-ferrous Metal Resources,Kunming 650093,China;State Key Laboratory of Mineral Processing Science and Technology,Beijing 100160,China;Kunming University of Science and Technology,College of Metallurgical and Energy Engineering,Kunming 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]省部共建复杂有色金属资源清洁利用国家重点实验室,云南昆明650093 [3]矿物加工科学与技术国家重点实验室,北京100160 [4]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《昆明理工大学学报(自然科学版)》2025年第1期35-43,共9页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(52364029,52264030);矿物加工科学与技术国家重点试验室开放基金项目(BGRIMM-KJSKL-2024-12);云南省科技厅研究项目(202401AT070317,202201BE070001-048).

摘　　要：高硫铁精矿既提高冶炼成本,加重大气污染,还会让钢产生“热脆”现象,并降低钢的产品品质.云南某微细粒磁铁矿精矿硫含量超标,S质量分数为2.36%,TFe含量为61.53%,含铁矿物主要为磁铁矿,硫主要赋存在磁黄铁矿中.本文在低碱条件下采用反浮选脱硫流程,并加入一种新型活化剂TA,在自然pH值,粗选六偏磷酸钠400 g/t、TA 800 g/t、丁基黄药100 g/t+丁铵黑药50 g/t,扫选丁基黄药100 g/t+丁铵黑药50 g/t的条件下,经一粗一扫一精、中矿顺序返回的闭路浮选流程,最终获得S品位0.34%,Fe品位62.34%,Fe回收率91.52%的脱硫铁精矿,S的脱除率达到86.94%.接触角和吸附量试验结果表明:相对于硫酸铜活化剂,TA活化剂活化效果更好,更有利于黄药在磁黄铁矿表面的吸附,并提高磁黄铁矿的疏水性.High sulfur iron concentrate not only increases the smelting cost,aggravates air pollution,but also causes the phenomenon of“heat brittleness”in steel and reduces the quality of steel products.The sulfur content of magnetite concentrate from a specific mine in Yunnan exceeded the standard,with the quality score of S is 2.36%and a TFe content of 61.53%.The main iron-bearing mineral was magnetite,and sulfur was primarily present in pyrrhotite.In this study,a desulfurization process using reverse flotation under low alkali conditions was adopted,and a new type of activator,TA,was added.Under natural pH conditions,rougher flotation was carried out with 400 g/t sodium hexametaphosphate,800 g/t TA,100g/t butyl xanthate+50 g/t ammonium dibutyl dithiophosphate.Cleaning flotation was conducted with 100 g/t butyl xanthate and 50 g/t ammonium dibutyl dithiophosphate.By employing a closed-circuit flowsheet consisting of one roughing stage,one cleaning stage,and one scavenging stage,with all middlings returned to the previous flotation operations,it was possible to obtain iron concentrate with an S grade of 0.34%,Fe grade of 62.34%,and Fe recovery of 91.52%.The sulfur removal rate reached 86.94%.Contact angle and adsorption experiments demonstrated that the TA activator had a superior activation effect compared to CuSO 4 and exhibited improved affinity for the adsorption of xanthate on the surface of pyrrhotite,thereby enhancing the hydrophobicity of pyrrhotite.

关 键 词：磁铁矿 磁黄铁矿 脱硫 低碱 TA 反浮选 

分 类 号：TD951[矿业工程—选矿] TD923