攀西橄辉岩型低品位钛铁矿振动脉动与脉动高梯度磁选工艺对比

Comparison between vibrating-pulsating and pulsating high gradient magnetic separation processes for separating olivine-type low grade ilmenite ore from Panxi area

随开采深度的增加,攀西钛铁矿中易泥化、与钛铁矿磁性差异较小的橄辉岩型钛铁矿含量增多,降低了脉动高梯度磁选机的分选指标,使后续浮选过程中合格钛精矿的生产成本和难度增大。针对这一问题,本文开展振动脉动高梯度磁选与脉动高梯度磁选橄辉岩型低品位钛铁矿的对比试验研究。结果表明:在钛粗精矿的TiO_(2)品位为9.00%、−0.074 mm粒级产率为57.60%的条件下,采用SLon−100周期式脉动高梯度磁选机分选时,所得磁性精矿的TiO_(2)品位为15%~17%,分选精度上限较低;采用SLon-Z−100周期式振动脉动高梯度磁选机分选时,所得磁性精矿的TiO_(2)品位为20%~22%,分选精度上限明显提高。在相近的磁性精矿TiO_(2)品位(15%)或TiO_(2)回收率(73%)条件下,振动脉动高梯度磁选工艺的各项分选指标均明显优于脉动高梯度磁选工艺,表明磁介质振动动态捕获模式具有更高的捕获选择性。

With the increase of mining depth,the contents of olivine and diopside in the ilmenite ore in Panxi area increase.The gangue minerals such as olivine and diopside are easy to be slimed and have close magnetic susceptibility with ilmenite,which deteriorate the separation performances of pulsating high gradient magnetic separation(HGMS)and increase the cost and difficulty for production of qualified titanium concentrate in the subsequent flotation process.To solve this problem,the vibrating-pulsating and pulsating HGMS experiments were comparatively carried out for separating the olivine-type low grade ilmenite ore.The results show that,when treating an ore sample with TiO_(2)grade at 9.00%and−0.074 mm size fraction at 57.60%,the SLon−100 cyclic pulsating HGMS separator produces a relatively low selectivity with TiO_(2)grade in concentrate at only 15%−17%,while the SLon-Z−100 cyclic vibrating-pulsating HGMS separator has an obviously higher selectivity with TiO_(2)grade reaching 20%−22%.In addition,comparing their separation performances under close TiO_(2)grade at around 15%or under close recovery at around 73%,the vibrating-pulsating HGMS possesses much better separation indexes than pulsating HGMS,indicating that the dynamic capture model realized by vibrating matrix has a higher selectivity of separation.