盐酸加盐浸出攀西钛铁矿的研究

Leaching Ilmenite from Panxi Ilmenite by Using HCl and Chloride Slat Solutions

使用含有氯化盐的盐酸和纯盐酸浸出钛铁矿,试验发现,在盐酸浓度为18%、液固比4.2,135℃的条件下,含有氯化盐的盐酸在30 min内浸出所得人造金红石品位与盐酸直接浸出得到的人造金红石品位相近,均在83.77%左右;且在含盐盐酸浸出1 h左右,反应基本达到终点,所得人造金红石品位约为93.19%以上。同时测试了盐酸中氯化盐的浓度对所得人造金红石品位和粉化率影响以及浸出前盐酸活度,发现含盐盐酸活度与氯化盐浓度以及种类有关,提高氯化盐阳离子价态或者氯化盐浓度对盐酸活度都有大幅度提升,但不同种类相同价态阳离子对盐酸活度影响相同;含盐盐酸浸出所得人造金红石品位比盐酸直接浸出所得高,但粉化率也更为严重。通过扫描电镜(SEM)分析可以发现,反应过程中氯化氧钛水解生成大量针状金红石并且发生聚结,形成球状颗粒,即化学因素是造成金红石粉化的主要原因。

The experiments of leaching ilmenite were conducted by using HCl-chloride salt solution and hydrochloride acid solution respectively. The results showed that when the concentration of hydrochloride acid was 18% with a liquid-solid ratio of 4. 2 at 135 ℃,the grade of synthetic rutile achieved by leaching with HCl-chloride salt solution for 30 min was similar to those achieved by leaching with hydrochloride acid solution for 1 h. After leaching for 1 h,the reaction by using HCl-chloride salt solution was nearly reaching its endpoint,and the grade of synthetic rutile was about 89%. Experiments were performed to investigate the effects of different chloride salt concentrationson the grade of synthetic rutile and activity of hydrochloride acid solution with chloride salt. The test showed that the activity of hydrochloride acid solution increased with the rise of hydrochloride salt concentration,and the fining rate and the grade of synthetic rutile also increased dramatically. The analysis of scanning electron microscope（SEM） image showed that needle-like synthetic rutile got together,and the chemical factors caused the increase of pulverization.