新型捕收剂DPY-4反浮选酒泉铁矿焙烧后的磁选精矿  

Reverse Flotation of Magnetic Concentrate of Jiuquan Iron Ore after Roasting Using a New Collector DPY-4

作　　者：朱一民[1] 丛璐 陈培宇 韩跃新[1] 刘杰[1] ZHU Yimin;CONG Lu;CHEN Peiyu;HAN Yuexin;LIU Jie(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《金属矿山》2024年第11期81-87,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:51974067);辽宁省“兴辽英才计划”项目(编号:XLYC2007055)。

摘　　要：酒钢选矿厂铁矿石矿物组成复杂、矿石品位低、共伴生成分较多,其磁选精矿铁品位低、石英等脉石矿物含量高,属于难选铁矿石,酒钢选矿厂采用反浮选流程处理焙烧磁选精矿。新型常温反浮选捕收剂DPY-4可提高铁矿石的品位及回收率,为难选铁矿石的高效反浮选药剂。为研究该捕收剂对该矿石分选的有效性,进行了系统的选矿试验和机理分析。对石英和磁铁矿进行纯矿物浮选条件试验,在DPY-4浮选体系下,当pH=5、温度25℃、DPY-4用量为20 mg/L、抑制剂玉米淀粉用量40 mg/L时,石英和磁铁矿的回收率分别为92.51%和4.46%。针对酒钢选矿厂悬浮磁化焙烧后的三段磁选精矿进行反浮选试验,在矿浆温度25℃、DPY-4用量300 g/t、玉米淀粉用量600 g/t、pH=9.5时,获得的开路浮选精矿铁品位60.48%、铁回收率69.24%,闭路浮选精矿铁品位58.35%、铁回收率94.05%、SiO_(2)含量为4.62%。DPY-4不仅捕收能力强,而且选择性优异,这主要是因为DPY-4在石英表面能发生强烈的吸附作用,包括物理吸附和氢键吸附,玉米淀粉在石英表面吸附较弱,而对磁铁矿的作用相反。The mineral composition of the iron ore in JISCO concentrator is complex,the ore grade is low,and the associated components are more.Its magnetic concentrate has low iron grade and high gangue mineral content such as quartz,which belongs to the refractory iron ore.The roasted magnetic concentrate is treated by reverse flotation process in JISCO concentrator.The new normal temperature reverse flotation collector DPY-4 can improve the grade and recovery of iron ore,and is an efficient reverse flotation agent for iron ore which is difficult to be selected.In order to study the separation effectiveness of the collector for the ore,systematic beneficiation tests and mechanism analysis were carried out.Pure mineral flotation condition tests were carried out on quartz and magnetite.In the DPY-4 flotation system,when pH of 5,temperature of 25℃,DPY-4 dosage of 20 mg/L and inhibitor corn starch dosage of 40 mg/L,the recovery rates of quartz and magnetite are 92.51%and 4.46%,respectively.Reverse flotation tests were carried out on the three-stage magnetic concentrate after suspension magnetization roasting in Jiusteel concentrating plant.Under the slurry temperature of 25℃,the dosage of DPY-4 of 300 g/t,the dosage of corn starch of 600 g/t,and pH of 9.5,the iron grade and recovery rate of the open-circuit flotation concentrate were 60.48%and 69.24%.The iron grade of the closed-circuit flotation concentrate is 58.35%,the iron recovery rate is 94.05%,and the SiO_(2)content is 4.62%.DPY-4 not only showed strong harvesting ability,but also excellent selectivity.This is mainly due to the strong adsorption of DPY-4 on the quartz surface,including physical adsorption and hydrogen bond adsorption,while the adsorption of corn starch on the quartz surface is weak,and the effect of magnetite is opposite.

关 键 词：焙烧矿 磁选精矿 反浮选捕收剂 DPY-4 

分 类 号：TD951[矿业工程—选矿]