淀粉及其改性产品对东鞍山细粒赤铁矿聚团——磁选的影响  

Effect of Starch and Its Modified Products on Agglomeration and Magnetic Separation of Fine-grainedHematite in Donganshan

作　　者：张爽[1] 李文博[1] 程绍凯 周立波 ZHANG Shuang;LI Wenbo;CHENG Shaokai;ZHOU Libo(College 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3期83-88,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:51974068);辽宁省科学技术计划项目(编号:2022-YQ-10)。

摘　　要：针对东鞍山强磁选抛尾存在粒度小于20μm的微细粒铁矿物流失的问题,研究了不同种类淀粉及其改性产品对微细粒赤铁矿的选择性聚团效果,通过团聚—磁选试验确定了适宜的团聚药剂和用量,借助偏光显微镜和红外光谱等手段检测了药剂与赤铁矿和石英作用前后的形貌特征,最后通过研究高分子药剂的作用机理,论述了药剂的选择性和团聚效果。结果表明:在药剂用量为200 g/t时,交联玉米淀粉的选矿指标优于其他几种药剂,团聚药剂的加入能实现微细粒赤铁矿的选择性聚团,使铁精矿回收率提高2.13~3.94个百分点,选矿效率提高2.77~3.46个百分点,但由于赤铁矿被团聚后呈不规则絮状,在较大的聚团中会夹杂少量石英,导致磁选精矿铁品位略微降低。In view of the loss of micro-fine iron minerals with a particle size of less than 20μm in Donganshan high-in-tensity magnetic tailings,this paper studied the selective agglomeration effect of different types of starch and its modified prod-ucts on micro-fine hematite,and determined the best agglomeration agent and dosage by agglomeration-magnetic separation test.The morphological characteristics of the agglomerates before and after the agglomeration of the reagent with hematite and quartz were detected by means of polarizing microscope and FTIR.The mechanism of the action of the polymer reagent was studied,and the selectivity and agglomeration effect of the polymer reagent were clarified.The test results showed that when the dosage of reagent is 200 g/t,the beneficiation index of cross-linked corn starch is better than that of other reagents.The addi-tion of agglomeration reagent can realize the selective agglomeration of micro-fine hematite,which increases the recovery rate of iron concentrate by 2.13~3.94 percentage points and the beneficiation efficiency by 2.77~3.46 percentage points.However,due to the irregular flocculation of hematite after agglomeration,a small amount of quartz will be mixed in the larger agglomera-tion,resulting in a slight decrease in the iron grade of magnetic separation concentrate.

关 键 词：微细粒赤铁矿 淀粉及其改性产品 选择性团聚 强磁选 FTIR 

分 类 号：TD951[矿业工程—选矿] TD924