首页|微波干燥钛渣的动力学特性及其机理

微波干燥钛渣的动力学特性及其机理

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氯化法生产钛白粉的工艺是以钛渣为原料,主要包含氯化、氧化和后处理等工艺.钛渣中含有一定的水分,易与氯气发生反应,生成的HC1和HClO会腐蚀设备.氧化过程中急剧的温度变化会导致水蒸气聚集,进而引起产品严重团聚,增大生产成本并降低产品性能.常用的烘箱干燥法、冷冻干燥法和喷雾干燥法已经难以满足现如今工业化生产中节约时间、节省成本的要求.微波干燥有着独特的传热机理,它的选择性加热会将热量直接传递给物料中的水分,从而迅速提高水分的温度使其快速挥发.利用微波选择性加热干燥钛渣的优点,讨论了初始水含量、初始质量以及微波功率对干燥过程的影响规律.钛渣质量为50 g、水含量(质量分数)为2％,在微波功率550 W的条件下,有效扩散系数为1.244 31×10-7m2/s.研究结果表明,上述因素与有效扩散系数呈正相关,结合微观图像分析获得了钛渣微波深度干燥过程中的热质迁移机理,微波干燥能使钛渣快速释放内部水分,实现钛渣的深度干燥.本研究为微波干燥的工业化施行提供了一定的理论基础.
Dynamic characteristics and corresponding mechanism for drying process of titanium slag under microwave drying
The produce process of titanium dioxide mainly includes oxidation,chlorination,and post-treatment sta-ges,which uses titanium slag as raw materials.However,the titanium slag contains moisture,which is easy to re-act with chlorine to generate HCl and HClO,and subsequently corrodes equipment.Meanwhile,the rapid tempera-ture change in the oxidation process will lead to the accumulation of water vapor,which may lead to serious agglom-eration,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 heat-ing 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 implemen-tation of microwave drying.

titanium slagmicrowave dryinginitial moisture contentinitial massmicrowave powereffective dif-fusion coefficientheat and mass transfer mechanism

林清华、黄巍巍、高磊、陈晋、陈菓

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云南大西洋焊接材料有限公司,云南昆明 650500

云南民族大学云南省高校绿色化学材料重点实验室,云南昆明 650500

昆明理工大学冶金与能源工程学院,云南昆明 650093

钛渣 微波干燥 初始水含量 初始质量 微波功率 有效扩散系数 热质迁移机理

国家自然科学基金资助项目云南省重大科技专项资助项目云南省基础研究计划资助项目

52104351202202AG050007202101AU070088

2024

10.13228/j.boyuan.issn1006-9356.20230574

中国冶金
中国金属学会

中国冶金

CSTPCD北大核心
影响因子：0.907
ISSN：1006-9356
年,卷(期)：2024.34(2)
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