Non-isothermal microwave leaching kinetics and
absorption characteristics of primary titanium-rich materials
(1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. Key Laboratory of Unconventional Metallurgy, Ministry of Education,
Kunming University of Science and Technology, Kunming 650093, China;
3. Yunnan Copper Co., Ltd., Kunming 650102, China;
4. School of Information Science and Engineering, Yunnan University, Kunming 650091, China)
Kunming 650093, China;
2. Key Laboratory of Unconventional Metallurgy, Ministry of Education,
Kunming University of Science and Technology, Kunming 650093, China;
3. Yunnan Copper Co., Ltd., Kunming 650102, China;
4. School of Information Science and Engineering, Yunnan University, Kunming 650091, China)
Abstract: The non-isothermal leaching kinetics of primary titanium-rich material by microwave heating was investigated, and the temperature-pressure curves of leaching system and microwave absorption characteristics of mixture solutions before and after leaching were measured. The research of non-isothermal kinetics was evaluated by the leaching rate of Fe and the total apparent velocity equation of the non-isothermal kinetics of leaching for primary titanium-rich material by microwave heating was obtained. It is shown from the temperature-pressure curves that the high temperature and high pressure of closed leaching system are favorable to the enhancement of the leaching rate of Fe. Microwave absorption characteristics of mixture solutions before and after leaching show that there are abrupt changes of microwave absorption characteristics for 15% HCl solution and the mixture solution after leaching by 20% HCl.
Key words: primary titanium-rich material; non-isothermal kinetics; microwave absorption characteristic