| The vanadium titano-magnetite ore in Panzhihua district is one of the most important titanium resources in China. The major industrial titanium-containing mineral in the ore is ilmenite. However, because of the complexity of the ore composition, low grade of titanium, ilmenite recovery has always been a big problem. For many years, some scholars and mining workers have done a lot of depth and detailed research on the comprehensive utilization of vanadium titano-magnetite ore in Panzhihua district, and many suggestions about the comprehensive utilization of the ore were provided.China is the first country that can extract iron, vanadium and titanium from complex vanadium titano-magnetite ore in industrial-scale, which is a great achievement. The general technical line of the comprehensive utilization of vanadium titano-magnetite ore in Panzhihua district is consisted of three parts. Firstly, we concentrate magnetite and titano-magnetite. Secondly, vanadium is recoverd from the titano-magnetite in metallurgy process. Finally, ilmenite is separated from the tailings of magnetic separation. The traditional separating process of ilmenite was consisted of gravity separation, magnetic separation, floatation and electrostatic separation. But the recovery of ilmenite is very low(about 20%). Nowerdays, the most popular separating process of ilmenite is "high intensity magnetic separation——floatation". This process is able to recover more ilmenite and the recovery is about 30%. But there are still many disadvantages. For example, the process is too long and complicated, the recovery of ilmenite is still low, ilmenite of fine fraction can not be recovered effectively and so on. The demand for raw materials is increasing with the continuous development of China's titanium industry. It is very important to improve the separating process of ilmenite and get better utilization of the vanadium titano-magnetite ore in Panzhihua district.The basic technical line of the study is "simplifying the methods, shortening the process, all-partical-fraction and improving the indicators ". A systematic and in-depth study of recovering ilmenite from the vanadium titano-magnetite ore in Panzhihua district by all-partical-fraction-floatation process("APF-floatation") was carried out through a lot of experiments. A series of technical problems were solved. Finally, the "APF-floatation" is successful with the concentrate grade≥47% and recovery≥50%. Meanwhile, the study of monominerals floatation mechanism provides a theoretical basis.Overall the "APF-floatation" has the following key technical points:complete removal of titano-magnetite pretreatment, the usage of efficient collector, precise control of pH value and reasonable flow structure.The study discovered the titano-magnetite has "Priority Floating Effect" and "Magnetic Agglomeration Effect". The two effects have bad influence on ilmenite floatation. The pre-removal of residual magnetite before concentrating ilmenite from magnetic separation tailings by floatation is essential. It is noteworthy that the sulfuric acid is not only the pH conditioner but also the important activator in the ilmenite flotation. The activation was studied and confirmed in this paper. The effect of pH value on the performance of ilmenite floatation is investigated. It is found that a pH value range of 4.5-5.5 is the best one for ilmenite floatation, within which ilmenite presents the most optimal floatability and selectivity. And pH values of 5 and 4.5 are considered to be the best pH values for roughing and cleaning respectively according to the different demands.This research compared the effects of a variety of collectors and depressants in ilmenite flotation by detailed monominerals floatation tests and carried out detailed analysis and discussion. Finally we consider that the usage of new and efficient collector SYB2# is the key to the success of "APF-floatation" in this study. The other conclusion is that carboxymethyl cellulose is the most effective depressant.
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