摘要
在磨矿过程中,菱镁矿与含钙脉石矿物白云石易发生表面溶解,引起表面性质趋同,导致浮选分离困难。基于此,采用一种多元羧酸助磨剂(EGTA)优化菱镁矿的磨浮体系,并运用浮选、比表面积分析、Zeta电位与ICP-OES及SEM-EDS检测手段研究了EGTA的作用机理。试验结果表明,添加500g/t的EGTA可使磨矿产品74~38μm合格粒级产率提高6.6个百分点,微细粒级-38μm产率降低2.0个百分点;在助磨剂EGTA用量200g/t、pH=10.5、抑制剂STPP用量300g/t、捕收剂Na OL用量700g/t的条件下,经一次粗选可获得MgO品位47.1%、MgO回收率69.50%的精矿。与未添加助磨剂相比,精矿MgO品位提高了0.4个百分点;Zeta电位研究表明,EGTA可以选择性吸附在白云石表面,降低白云石的Zeta电位;ICP-OES和SEM-EDS分析表明,添加EGTA可促进白云石溶解,降低菱镁矿石表面钙含量,同时EGTA可以螯合矿浆中的Ca^(2+),抑制溶解的Ca^(2+)反向吸附,加大矿物表面性质的差异,强化菱镁矿石浮选分离效果。
In the grinding process,magnesite and calcium-bearing gangue mineral dolomite are prone to surface dissolution,which causes the convergence of surface properties and leads to the difficulty of flotation separation.Based on this,a polycarboxylic acid grinding aid(EGTA)is used to optimize the grinding and flotation system of magnesite,and the mechanism of EGTA is studied by flotation,specific surface area analysis,Zeta potential,ICP-OES and SEM-EDS.The test results show that the addition of 500 g/t EGTA can increase the yield of 74~38μm qualified particle size of grinding products by 6.6 percentage points,and reduce the yield of-38μm fine particle size by 2.0 percentage points.Under the conditions of grinding aid EGTA dosage 200 g/t,pH=10.5,inhibitor STPP dosage 300 g/t and collector NaOL dosage 700 g/t,the concentrate with MgO grade of 47.1%and MgO recovery of 69.50%can be obtained by one roughing.Compared with the concentrate without grinding aids,the MgO grade of the concentrate increases by 0.4 percentage points.Zeta potential studies show that EGTA can be selectively adsorbed on the surface of dolomite and reduce the Zeta potential of dolomite.ICP-OES and SEM-EDS analysis show that the addition of EGTA can promote the dissolution of dolomite and reduce the calcium content on the surface of magnesite ore.At the same time,EGTA can chelate Ca^(2+)in the pulp,inhibit the reverse adsorption of dissolved Ca^(2+),increase the difference of mineral surface properties,and strengthen the flotation separation effect of magnesite ore.
作者
刘文宝
郑杰
王子芊
商传浩
刘文刚
LIU Wenbao;ZHENG Jie;WANG Ziqian;SHANG Chuanhao;LIU Wengang(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)
出处
《金属矿山》
CAS
北大核心
2024年第10期85-91,共7页
Metal Mine
基金
国家自然科学基金面上项目(编号:52474286)
辽宁省自然科学基金面上项目(编号:2023-MS-077)
中央高校基本科研业务专项资金(编号:N2301015)
中国博士后科学基金(编号:2022M720927)
大学生创新创业训练计划项目(编号:240055)。
关键词
低品级菱镁矿石
磨矿
助磨剂
浮选分离
调控
low grade magnesite ore
grinding
grinding aid
flotation separation
regulation
