酒钢铁矿石悬浮焙烧磁选精矿提质降杂试验研究

Experiment Study on Quality Improvement and Impurity Reduction of Concentrate by Suspension Magnetization Roasting-Magnetic Separation from JISCO Iron Ore

以酒钢镜铁山粉矿的悬浮焙烧产品通过单一磁选获得的产品难以满足钢铁冶炼的生产要求,因此,在对铁品位为55.00%的磁选精矿进行工艺矿物学分析的基础上,采用反浮选工艺进行提质降杂试验。磁选精矿中铁主要以磁铁矿形式存在,分布率为95.38%。磁铁矿主要以单体形式存在,单体占有率为84.34%,而且其连生体主要为富连生体。在浮选矿浆温度为30℃,粗选捕收剂YG-328B用量为300 g/t、抑制剂苛性淀粉用量为400 g/t、矿浆p H值为7.5条件下,经1粗1精3扫反浮选闭路试验,获得了铁品位为58.02%、铁回收率为98.39%的浮选精矿。红外光谱分析结果表明,抑制剂苛性淀粉以化学吸附和氢键吸附2种方式吸附于磁铁矿表面,捕收剂YG-328B以静电吸附方式吸附于石英表面。

The single magnetic separation concentrate after suspension magnetization roasting of Jingtieshan fine iron ore from JISCO can not meet the production requirements of iron and steel smelting.Therefore,on the basis of the process mineralogy analysis of the magnetic separation concentrate with 55.00%iron grade,the reverse flotation process was adopted to conduct the test of quality improvement and impurity reduction.The iron in the magnetic separation concentrate mainly occurs in magnetite,with distribution rate of 95.38%.Magnetite is mainly in the form of the monomer,whose liberation degree is 84.34%.Besides,the intergrowth is mainly rich intergrowth.Under the conditions that the flotation pulp temperature was 30℃,the dosage of collector YG-328B was 300 g/t during roughing,the dosage of depressant caustic starch was 400 g/t,and the pulp p H value was 7.5,the flotation concentrate with iron grade of 58.02%and iron recovery of 98.39%was obtained through the closed-circuit reverse flotation process of one roughing,one concentration and three scavenging.The results of infrared spectrum analysis showed that the depressant caustic starch was adsorbed on the surface of magnetite depending on chemical bonding and hydrogen bonding,and the collector YG-328B was adsorbed on the surface of quartz depending on electrostatic attraction.