Inorganic Chemicals Industry >
Study on impurity removal rule of ferrous sulfate from by-product of titanium dioxide by crystallization purification
Received date: 2021-09-30
Online published: 2022-07-14
The freezing crystallization process was used to study on purification of by-product ferrous sulfate of titanium dioxide.The accumulation of Mg and Mn impurities and their removal rules during the circulation of the crystallization mother liquor were mainly investigated.Meanwhile，the influence of Na impurities that may be introduced into the system was also studied.Through multiple crystallizations，the Mg and Mn impurities in FeSO4·7H2O could be gradually reduced，but the circulation of the crystallization mother liquor would cause the gradual accumulation of Mg and Mn impurities in the system.By using the relationship curve between the content of Mg and Mn in the crystal liquid and the crystal，it could be inferred that the Mg content in the FeSO4·7H2O would be lower than 0.025% when the Mg content in the crystal liquid was less than 298 mg/L，and the Mn content in FeSO4·7H2O would be higher than 0.05% when the Mn content in the crystal liquid was higher than 761mg/L.In addition，Na should be avoided to introduce into the system，otherwise it would cause the Na impurity content in FeSO4·7H2O to exceed the standard.The research results of this paper could provide certain theoretical and technical guidance for purifying by-product ferrous sulfate of titanium dioxide by crystallization approach.
Wanye ZHU , Ding TANG , Heting CHI , Xianghui LIAO , Rongchuan ZHUANG , Qiankun WANG , Qingfeng SHEN . Study on impurity removal rule of ferrous sulfate from by-product of titanium dioxide by crystallization purification[J]. Inorganic Chemicals Industry, 2022 , 54(7) : 105 -109 . DOI: 10.19964/j.issn.1006-4990.2021-0594
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