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| Dynamic characteristics and corresponding mechanism for drying process of titanium slag under microwave drying |
| LIN Qinghua1, HUANG Weiwei2, GAO Lei3, CHEN Jin3, CHEN Guo2 |
1. Yunnan Atlantic Electrode Co., Ltd., Kunming 650500, Yunnan, China;
2. Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, Yunnan, China;
3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China |
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Abstract The produce process of titanium dioxide mainly includes oxidation, chlorination, and post-treatment stages, which uses titanium slag as raw materials. However, the titanium slag contains moisture, which is easy to react with chlorine to generate HCl and HClO, and subsequently corrodes equipment. Meanwhile, the rapid temperature change in the oxidation process will lead to the accumulation of water vapor, which may lead to serious agglomeration, increasing production costs and reducing product performance. The commonly used oven drying method, freeze drying method and spray drying method have been difficult to meet the requirements of time saving and cost saving in today's industrial production. Microwave drying have a unique heat transfer mechanism. Its selective heating of water directly transfers heat to the water in the material, thereby rapidly increasing the temperature of water and causing it to evaporate quickly. The advantage of microwave selective heating to dry titanium slag was utilized, and the effects of initial moisture content, initial mass, and microwave power on the drying process were discussed. The effective diffusion coefficient is 1.244 31 × 10-7 m2/s at mass of 50 g and water content of 2% of titanium slag under microwave power of 550 W. These parameters are positively correlated with the effective diffusion coefficient. Combined with microscopic image analysis, the mechanism of heat and mass transfer in the microwave deep drying process of titanium slag is proposed. Microwave drying can make titanium slag quickly release internal moisture, and realize deep drying of high titanium slag. This study provides a certain theoretical basis for the industrial implementation of microwave drying.
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Received: 19 September 2023
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2024, Vol. 34 
