Research on Preparation of Synthetic Rutile with Panxi Ilmenite

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 TiO₂% ≥90%,CaO + MgO≤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".