喷雾干燥回收沉淀泥浆中的TiCl_4

Recovery of TiCl_4 from Precipitation Slime by Spray Drying

采用喷雾干燥法对粗四氯化钛沉淀泥浆中TiCl4的回收进行了研究。首先,在实验室以空气作为沉淀泥浆干燥的加热介质,进行喷雾干燥。然后,在生产现场以氩气作为沉淀泥浆干燥的加热介质,进行喷雾干燥。研究结果表明,以氩气作为沉淀泥浆干燥的加热介质,在喷雾驱动进气压力为0.5 MPa,加热干燥进气压力为0.15 MPa,加热干燥进气温度为350℃,尾气出口温度为125℃的条件下喷雾干燥,沉淀泥浆中TiCl4的含量由55.3%(质量分数,下同)降至1.8%,对应泥浆中TiCl4的蒸发率达98%以上,回收率达96%以上。

The recovery of TiC14 from the slime forming in raw titanium tetrachloride by spray drying was studied. During spray drying process, the air worked as heating medium in laboratory, and argon worked as heating medium in work site. Experimental results show that the content of TiC14 in the slime reduces from 55.3% to 1.8% by spray dr- ying with the actuating pressure 0.5 MPa for the nozzle, and the intake pressure 0. 15 MPa for the drying gas, at the temperature 350℃ and 125 ℃ in the inlet gas and the off-gas respectively. After spray drying, 98% TiC14 vaporizes from the slime and the recovery rate reaches 96%.