铁钛平行分选对微细粒钛铁矿强磁选的影响

采用"铁钛平行分选"工艺对高压辊磨超细碎的-3.2 mm钒钛磁铁矿进行选别实验,研究了强磁选对钛铁矿的分选效果.当磨矿细度为-74μm粒级占80%时,辊压产品选钛给矿的单体解离度较颚破产品高0.58%,辊压产品-19μm+11μm粒级中铁氧化物的单体含量较颚破产品低1.38%.与颚破产品采用"阶段磨矿-阶段分选"工艺相比,"铁钛平行分选"得到的强磁精矿中Ti O2的回收率提高5.11%,-19μm粒级的含量降低2.62%.不同粒级钛铁矿在分选空间中的受力分析表明,当粒度降低时,钛铁矿所受的比阻力急剧增加,而比磁力却有所降低,这增加了钛铁矿颗粒被磁场捕获的难度."铁钛平行分选"能够降低选别过程中微细粒钛铁矿的新生成量,改善钛铁矿的强磁选别效果.

Effect of Parallel Separation of Fe and Ti on High-Intensity Magnetic Separation of Micro-fine Ilmenite

The separation test of -3.2mm V-Ti magnetite ore ultra-finely crushed by HPGR was carried out with the process of parallel separation of Fe and Ti. The effect of high-intensity magnetic separation on ilmenite was investigated. When the crushed ores with grind fineness of -74μm accounted for 80%， the liberation degree of the product crushed by HPGR increased by 0.58% and the number of iron oxide in the ores with fineness of -19μm+11μm decreased by 1.38%， compared with that by Jaw crusher. The TiO₂ recovery could increase by 5.11% and the content of the product with -19μm could reduce by 2.62% in high-intensity magnetic concentrate， compared with the product crushed by Jaw crusher and separated by the process of stage-grinding and stage-separating. The force analysis on ilmenite with different sizes in the separation space show that， as the particle size decreases gradually， the specific resistance on ilmenite increases sharply and the specific magnetic force reduces， so ilmenite particle is more difficult to be captured by magnetic field. The process of parallel separation of Fe and Ti can reduce the amount of newly formed micro-fine ilmenite in the separation， improving the performance of high-intensity magnetic separation of ilmenite.