| 马拉维含难分离赤铁矿的钛锆粗精矿工艺矿物学及分离新技术的研究 |
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| 引用本文： | 喻连香,周吉奎,刘军,汤优优.马拉维含难分离赤铁矿的钛锆粗精矿工艺矿物学及分离新技术的研究[J].矿产保护与利用,2019,39(6):171-178. |
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| 作者姓名： | 喻连香 周吉奎 刘军 汤优优 |
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| 作者单位： | 1.广东省资源综合利用研究所，广东 广州 510650 |
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| 基金项目： | 广东省科技厅省属科研机构稳定支持项目;广东省部产学研企业创新平台项目;茂名市科技计划 |
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| 摘 要： | 马拉维难选钛锆粗精矿中钛矿物分布率48%左右，但由于铁、钛矿物较复杂，可回收钛矿物种类多，磁性变化大，同时存在磁性、密度与钛铁矿相似的赤铁矿及一些比重较大的磁性脉石如石榴石和角闪石等，磁选时，赤铁矿、石榴石和角闪石均会进入钛精矿中而影响钛精矿品位，因此，采用常规磁选或重选方法很难获得合格钛精矿。基于MLA技术系统工艺矿物学研究基础上，根据矿物组成及各矿物之间的特性差异，针对马拉维某海滨砂钛锆粗精矿，利用赤铁矿还原焙烧后磁性增强、以及磁性脉石与钛矿物之间有电性差的特点，采用湿式弱磁选—干式磁选（—还原焙烧—湿式弱磁选）—电选—重选联合工艺流程，可有效分离易进入钛精矿中的赤铁矿及磁性脉石。最终获得TiO2含量49.17%、回收率66.36%的钛精矿，ZrO2含量分别为65.04%、60.78%和55.79%的三个锆精矿，锆精矿合计回收率89.28%；同时综合回收了金红石、磁铁矿和稀土。本研究解决了钛锆粗精矿中钛铁矿与赤铁矿、磁性脉石矿物难分离的关键技术问题，可为该类钛锆资源的有效利用提供技术途径。
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| 关 键 词： | 钛铁矿 赤铁矿 锆石 金红石 稀土 还原焙烧 选冶联合 MLA |
| 收稿时间： | 2019-02-09 |
Study on Process Mineralogy and Separation Technology of Titanium-Zirconium Rough Concentrate with Refractory Hematite in Malawi |
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| Affiliation: | 1.Guangdong Institute of Resources Comprehensive Utilization, Guangzhou 510650, China2.State Key Laboratory of Rare Metal Separation and Comprehensive Utilization, Guangzhou 510650, China3.Guangdong Provincial Key Laboratory of Development & Comprehensive Utilization of Mineral Resources, Guangzhou 510650, China4.Guangdong Industrial Technology Achievements Transformation and Promotion Center, Guangzhou 510650, China |
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| Abstract: | The content of titanium minerals in the refractory titanium-zircon rough concentrate in Malawi is about 48%. However, due to the complexity of iron and titanium distribution, there are many types of recyclable titanium minerals and the magnetic changes are large. Meanwhile, there are existing some hematite with similar magnetic and density to titanium and some magnetic gangues with large specific gravity such as garnet and amphibole. When magnetic separation is used, hematite, garnet and amphibole will enter the titanium concentrate affecting the grade of titanium concentrate. Therefore, it is difficult to obtain qualified titanium concentrate by conventional magnetic separation or gravity separation method. For a seashore sand-titanium-zirconium rough concentrate in Malawi, the research basis of process mineralogy by MLA technology system and the mineral composition and the difference of characteristics between minerals were obtained. According to the magnetic enhancement after hematite reduction roasting and the difference in electrical properties between magnetic gangue and titanium mineral, the process of "wet low intensity magnetic separation-dry magnetic separation (reduction roasting-wet low intensity magnetic separation)-electric separation-gravity separation was adopted, which can realize the effective separation of hematite and magnetic gangue which were easy to enter into titanium concentrate. Finally, the titanium concentrate with TiO2 content of 49.17% and recovery of 66.36% was obtained. Three zirconium concentrate with ZrO2 content of 65.04%, 60.78% and 55.79% was obtained, respectively. The total recovery of zirconium concentrate was 89.28%. Meanwhile, rutile, magnetite and rare earth were recovered comprehensively. This study solved the key technical problems of difficult separation of titanium and hematite and magnetic gangue minerals in titanium-zirconium coarse concentrate, and provided a technical way for the effective utilization of such titanium-zirconium resources. |
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