(昆明理工大学 冶金与能源工程学院，昆明 650093)
摘 要: 针对赤铁矿法除铁过程中硫酸亚铁结晶会造成管道堵塞、除铁后液铁离子浓度较高等问题，通过研究硫酸亚铁的结晶行为，探索硫酸亚铁晶体对沉铁过程的影响，研究静止吸附、温度、Zn2+浓度、Mg2+浓度对硫酸亚铁结晶行为的影响。结果表明：随着温度的升高硫酸亚铁的溶解度降低，在160~180 ℃之间硫酸亚铁的溶解度急剧下降，硫酸亚铁大量结晶。Zn2+和Mg2+的加入都会降低硫酸亚铁的溶解度，硫酸亚铁溶解度急剧降低区间从160~170 ℃变为170~180 ℃。当温度190 ℃时，Fe2+浓度为30 g/L，Zn2+浓度为140 g/L，Mg2+浓度为5 g/L，反应后液Fe2+浓度为1.4 g/L，94.71%的Fe2+结晶。
关键字: 硫酸亚铁；溶解度；锌离子；镁离子；结晶
（Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:In view of the problems including blockage of pipes and high concentration of iron ions after iron removal caused by the crystallization of ferrous sulfate in the process of iron removal by hematite method, the effect of ferrous sulfate crystals on the process of iron precipitation was explored and the effects of static adsorption, temperature, Zn2+ concentration and Mg2+ concentration on the crystallization behavior of ferrous sulfate were studied by observing the crystallization behavior of ferrous sulfate. The results indicate that the solubility of ferrous sulfate decreases with the increase of temperature, and decreases so sharply between 160 ℃ and 180 ℃ that ferrous sulfate crystallizes. Besides, the addition of zinc ions or magnesium ions can reduce the solubility of ferrous sulfate, and the sharp decline range of the solubility of ferrous sulfate changes from 160-170 ℃ to 170-180 ℃ accordingly. And at the temperature of 190 ℃, the Fe2+ concentration is 30 g/L, the Zn2+ concentration is 140 g/L, the Mg2+ concentration is 5 g/L, the solution Fe2+ concentration is 1.4 g/L, and 94.71% of the ferrous ions crystallizes.
Key words: ferrous sulfate; solubility; zinc ion; magnesium ion; crystallization
