攀西钛精矿制备人造金红石研究

Research on Preparation of Synthetic Rutile with Panxi Ilmenite

利用攀西地区储量丰富的高钙镁低品位钛铁矿制备符合沸腾氯化需要的高品质富钛料是推动钛行业发展的关键。通过对攀西钛铁矿矿物组成和结构等物相特性分析,提出了氧化还原改性-盐酸浸出制备人造金红石的方法。先在实验室进行工艺条件优化试验,确定了关键参数。在此基础上,进行了5 kt/a规模人造金红石的扩大试验。扩大试验实现了连续稳定运行,成功获得了满足沸腾氯化需要的优质人造金红石产品,其Ti O2≥90%,Ca O+Mg O≤1.0%。酸浸产生的废盐酸,采用喷雾焙烧技术得到了回收利用,实现了盐酸闭路循环,确保全流程无"三废"排放。最后,形成了"攀西钛铁矿流态化氧化—还原—常压浸出—废酸回收"制造人造金红石的成套工艺及操作制度。

How to utilize the rich reserves of the low grade ilmenite containing high calcium and magnesium in Panxi area to prepare high quality titanium concentrates is the key to promote the development of titanium industry. Through the phase analysis of the compositions and structure of the ilmenite in Panxi area,a new method by using redox modification-hydrochloric acid leaching for preparing synthetic rutile was presented. In order to optimize the process,the condition tests had been conducted in the laboratory,and it helped to determine the key parameters. Based on these results,expanded tests for a 5 kt / a synthetic rutile had been researched. These experiments realized continuous and stable operation,and successfully obtained the products containing Ti O2% ≥90%,Ca O ＋ Mg O≤1. 0%,which could satisfy the needs of boiling chlorination. The wasted hydrochloric acid had been recycled by spray roasting technique in the leaching process,which realized a closed circulation and ensured the waste-free emission. Finally,a complete set of technology and operating system for producing synthetic rutile with Panxi ilmenite has been formed by using the technology of ＂fluidized oxidation- reduction- atmospheric leaching- waste acid recovery＂.