高压辊磨超细粉碎对钒钛磁铁矿分选的影响

来源期刊:中南大学学报(自然科学版)2019年第5期

论文作者:郭小飞 代淑娟 朱巨建 李丽匣 王洪彬

文章页码:1013 - 1021

关键词:高压辊磨机;钒钛磁铁矿;铁钛平行分选;单体解离度;比磁化系数

Key words:high pressure grinding rolls; vanadium titanium magnetite; parallel separation of Fe and Ti; liberation degree; specific susceptibility

摘    要:采用常规颚式破碎和高压辊磨2种不同粉碎方式,进行钒钛磁铁矿的分选试验,探究2种破碎方式对钒钛磁铁矿分选的影响,并结合粒度分析、单体解离度测试及比磁化系数分析,进一步研究高压辊磨机在钒钛磁铁矿选别中的作用机理。研究结果表明:高压辊磨机粉碎产品的粒度较小,可直接通过弱磁选将钛磁铁矿和钛铁矿分离开,进行“铁钛平行分选”;与颚式破碎机破碎产品相比,辊压产品经过一段磨矿过程就能通过相同的分选条件获得质量合格的钛磁铁矿精矿,并使钛铁矿精矿TiO2的作业回收率提高2.66%;2种破碎产品在球磨过程中的单体解离度存在差异,辊压产品中的含铁矿物能够优先实现单体解离,有利于钛磁铁矿的分选;“铁钛平行分选”能够简化磨矿过程,减少微细粒钛铁矿的生成量,提高钛铁矿强磁选的回收率,有利于钛铁矿的窄级别浮选。

Abstract: The separation experiments of vanadium titanium magnetite (V-Ti) crushed by conventional jaw crusher and high pressure grinding rolls (HPGR) were conducted. The influences of two different comminuting processes on separation of V-Ti magnetite were studied. Combined with the anslysis of particle size, degree of mineral liberation and specific susceptibility, the mechanism of HPGR in the separation process of V-Ti magnetite was studied. The results show that the products of HPGR are finer than those of conventional jaw crusher. Parallel separation of titanium magnetite(Fe) and ilmenite(Ti) can be realized through direct separation of Fe and Ti by low intensity magnetic separation from product crushed by HPGR. Qualified titanium magnetite can be obtained by only once grinding and other similar conditions, and the TiO2 operational recovery of ilmenite increases by 2.66%. The mineral degree of liberation in the primary grinding from this two comminuting processes become obviously different. Iron minerals of HPGR product preferentially achieve monomer dissociation, which benefits the separation of titanium magnetite. On the other hand, the parallel separation of Fe and Ti simplifies the grinding and reduces the generation of micro-fine ilmenite, which is beneficial to the high intensity magnetic separation and flotation of narrow size for ilmenite.

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