盐酸法钛白粉工艺的研究

Study on production process of titanium dioxide by hydrochloric acid method

盐酸法钛白粉生产工艺是一种有别于硫酸法和氯化法的全新路线,具有"三废"排放量少、盐酸可循环利用等优点。以宜宾天原聚氯乙烯生产过程中的副产盐酸为原料,通过对攀枝花地区钛精矿进行盐酸酸解工艺的研究,确定了盐酸法钛白粉的优化工艺条件:酸矿比7∶1,酸解温度85℃,酸解时间180 min,水解温度230℃,进料量1 L/h。在此条件下,可制得消色力大于1 600、亮度高于94.0、蓝相值大于3.0、金红石质量分数大于99%的颜料钛白粉,其TiO2的总回收率可达88%。

The hydrochloric acid method which was different from sulfuric acid method and chlorina- tion method, was a new route for production of titanium dioxide, and had advantages of low discharge of waste and recycle of hydrochloric acid. The by-product hydrochloric acid from PVC production in Yibin Tianyuan was used as raw material to study the acidolysis of Panzhihua ilmenite by hydrochloric acid. The best process conditions were determined as follows： ratio of acid to ilmenitie 7： 1, acidolysis temperature 85 ℃, acidolysis time 180 min, hydrolysis temperature 230 ℃, and flow I L/h. Under the above condi- tions, the obtained pigment titanium dioxide had rutile mass fraction over 99%, achromatic ability greater than 1 600, brightness greater than 94.0, and blue phase greater than 3.0. The total recovery of TiO2 was up to 88 %.