结晶法提纯钛白副产硫酸亚铁中杂质去除规律的研究

doi:10.19964/j.issn.1006-4990.2021-0594

Abstract

Abstract:

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.

Key words: by-product of titanium dioxide, ferrous sulfate, crystallization, impurity accumulation, sodium ion

CLC Number:

TQ138.11

ZHU Wanye,TANG Ding,CHI Heting,LIAO Xianghui,ZHUANG Rongchuan,WANG Qiankun,SHEN Qingfeng. 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.

Figures/Tables 8

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样品	体积/ mL	pH	Fe粉用量/g	ρ（Fe）/ （mg?L^-1）	ρ（Ti）/ （mg?L^-1）	ρ（Mg）/ （mg?L^-1）	ρ（Mn）/ （mg?L^-1）	ρ（Na）/ （mg?L^-1）	Ti 去除率/%	Fe 损失率/%
原液	1 100	2.3	—	95 500	875.00	1 655	362.0	11.4	—	—
除Ti后液1	940	3.0	600	108 700	150.00	1 805	382.0	12.1	85.35	2.73
除Ti后液2	930	4.0	750	108 500	0.35	2 005	396.5	12.8	99.96	3.95
除Ti后液3	915	5.0	1 500	101 500	0.35	2 012	397.0	13.1	99.96	11.59

产品	结晶液pH	w（Mg）/%	w（Mn）/%
FeSO₄·7H₂O晶体-1	2.0	0.28	0.032
FeSO₄·7H₂O晶体-2	4.0	0.32	0.041

样品	ρ（Mg）	ρ（Mn）	ρ（Na）
原液	1 655	362	11.4
一次循环结晶液	2 005	397	4 210
二次循环结晶液	2 500	515	5 550
三次循环结晶液	3 225	675	6 650

产品	w（Mg）	w（Mn）	w（Na）
一次循环FeSO₄·7H₂O晶体	0.200	0.027	0.031
二次循环FeSO₄·7H₂O晶体	0.220	0.031	0.048
三次循环FeSO₄·7H₂O晶体	0.270	0.044	0.069

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Study on impurity removal rule of ferrous sulfate from by-product of titanium dioxide by crystallization purification

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