攀西某微细粒钛磁铁矿强化分散—磁选试验
Enhanced dispersion-magnetic separation tests for micro-fine titanomagnetite in Panxi area
刘才鹏 1王维清 2孙晋睿 1熊惠明 1刘柳1
作者信息
- 1. 西南科技大学环境与资源学院,四川绵阳 621010
- 2. 西南科技大学环境与资源学院,四川绵阳 621010;固体废物处理与资源化教育部重点实验室,四川绵阳 621010
- 折叠
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1 992 r/min、搅拌时间3 min、六偏磷酸钠用量1 000 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.
Abstract
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 im-purity reduction index of conventional low-intensity magnetic separation is poor.The enhanced disper-sion-magnetic separation can effectively improve the separation effect and improve the separation in-dex.In order to strengthen the separation of fine-grained iron minerals in the ore samples,the experi-mental 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 oth-er factors on the separation effect.The test results show that under the conditions of 20％slurry concen-tration,mechanical stirring speed of 1 992 r/min,stirring time of 3 min,dosage of SHMP of 1 000 g/t,slurry pH of 10 and magnetic field strength of 300 kA/m,a good index of 57.69％iron grade in concen-trate 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 po-tential of titanomagnetite and titanaugite,thus weakening the heterogeneous coagulation of fine gangue minerals and titanomagnetite.
关键词
微细粒级钛磁铁矿/选钛/分散剂/DLVO理论Key words
fine-grained titanium magnetite/titanium concentration/dispersant/DLVO theory引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据