摘要
攀西某微细粒钛磁铁矿混合粗精矿因微细粒脉石矿物与钛磁铁矿异相凝聚,常规弱磁选提铁降杂指标较差,采用强化分散—磁选可有效改善选别效果、提高分选指标。为了强化分选矿样中的微细粒铁矿物,对强化分散—磁选工艺条件开展试验研究,考察了分散剂种类、分散剂用量、矿浆pH值、磁场强度等因素对分选效果的影响。试验结果表明:在矿浆浓度20%、机械搅拌速度1992 r/min、搅拌时间3 min、六偏磷酸钠用量1000 g/t、矿浆pH值10、磁场强度300 kA/m的条件下,获得了精矿铁品位57.69%,铁回收率98.10%的良好指标。与直接磁选结果相比,铁品位提高了1.26个百分点。DLVO理论分析表明,六偏磷酸钠通过降低钛磁铁矿和钛辉石表面电位,增大了二者异相之间的静电斥力,从而削弱微细粒脉石矿物与钛磁铁矿异相凝聚。
Due to the heterogeneous coagulation of fine-grained gangue minerals and titanomagnetite in the mixed rough concentrate of a fine-grained titanomagnetite in Panxi area,the iron extraction and impurity reduction index of conventional low-intensity magnetic separation is poor.The enhanced dispersion-magnetic separation can effectively improve the separation effect and improve the separation index.In order to strengthen the separation of fine-grained iron minerals in the ore samples,the experimental study on the process conditions of enhanced dispersion-magnetic separation was carried out to investigate the effects of dispersant type,dispersant dosage,slurry pH,magnetic field strength and other factors on the separation effect.The test results show that under the conditions of 20%slurry concentration,mechanical stirring speed of 1992 r/min,stirring time of 3 min,dosage of SHMP of 1000 g/t,slurry pH of 10 and magnetic field strength of 300 kA/m,a good index of 57.69%iron grade in concentrate and 98.10%iron recovery was obtained.Compared with the results of direct magnetic separation,the iron grade increased by 1.26%.DLVO theoretical analysis shows that sodium hexametaphosphate increases the electrostatic repulsion between titanomagnetite and titanaugite by reducing the surface potential of titanomagnetite and titanaugite,thus weakening the heterogeneous coagulation of fine gangue minerals and titanomagnetite.
作者
刘才鹏
王维清
孙晋睿
熊惠明
刘柳
Liu Caipeng;Wang Weiqing;Sun Jinrui;Xiong Huiming;Liu Liu(School of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Key Laboratory of Solid Waste Treatment and Recycling,Ministry of Education,Mianyang621010,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2024年第3期114-120,共7页
Iron Steel Vanadium Titanium
关键词
微细粒级钛磁铁矿
选钛
分散剂
DLVO理论
fine-grained titanium magnetite
titanium concentration
dispersant
DLVO theory
