文献类型：期刊文献

中文题名：萃取法分离钛白废酸中的铁

英文题名：Iron removal from waste sulfuric acid of titanium dioxide production by solvent extraction

作者：曹国民[1];阮林叶[1];盛梅[1]

机构：[1]华东理工大学环境工程研究所,上海200237

年份：2007

卷号：39

期号：10

起止页码：45

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：CSTPCD;;北大核心:【北大核心2004】；

语种：中文

中文关键词：钛白废酸;磷酸三丁酯;萃取

外文关键词：waste sulfuric acid from titanium dioxide production;tri -butyl phosphate;extraction

摘要：首先通过臭氧氧化作用把钛白废酸中的二价铁转化成三价铁,然后采用萃取法去除其中的三价铁。考察了络合剂（盐酸）浓度、萃取剂、萃取相比等对三价铁萃取率的影响,并初步探索了反萃法回收萃取剂及萃取剂的循环利用。结果表明：当盐酸浓度为3.4 mol/L时,几乎可完全络合溶液中的三价铁;在萃取剂磷酸三丁酯中加入苯作为稀释剂,可有效降低磷酸三丁酯的粘度,消除萃取过程中的乳化现象;磷酸三丁酯萃取三价铁的传质过程很快,2-3 min即达平衡;当萃取相比O/W（萃取剂与钛白废酸体积之比）=0.6∶1时,三价铁萃取率可达97%以上。当反萃相比W/O=4∶1时,三价铁反萃率接近100%。磷酸三丁酯经过5次萃取-反萃循环后,三价铁的萃取率没有明显下降。去除三价铁后的钛白废酸,经蒸馏浓缩到质量分数70%左右,再与浓硫酸混合后可用于钛白粉的生产,蒸馏过程中回收的盐酸循环使用。反萃出来的三价铁可作为生产铁红的原料。
The ferrous ion （ Fe^2＋ ） in the waste sulfuric acid from titanium dioxide production was oxidized to ferric ion （ Fe^3＋ ） by ozone oxidation, and then the solvent extraction was used to remove the ferric ion from the waste sulfuric acid. The effects of the complex agent （ hydrochloric acid ） concentration, the categories of organic solvents, the organic to aqueous ratio （O/W） on the extraction rate of Fe^3＋ were investigated. The recovery of extracting agent by back - extraction method and the recycle of extracting agent were preliminarily explored. Results showed that almost all Fe^3＋ could be transferred to ferric complex as the concentration of hydrochloric acid reached 3.4 mol/L ; as the dilution agent, benzene was mixed with extracting agent tri -butyl phosphate （TBP）, with which the viscosity of extracting agent decreased and the emulsification could be eliminated during extraction process ; the mass transport process was very short and the equilibrium time was only 2 - 3 min, when use TBP as the extracting agent to extract Fe^3＋ ;the extraction efficiency of Fe^3＋ is above 97% when O/W = 0.6：1 ; and the back - extraction rate of Fe^3＋ is nearly 100% when the W/O = 4： 1. There was no obviously decrease of extraction rate of Fe^3＋ after five successive extraction - stripping stages with TBP as extracting agent. After the Fe^3＋ was removed from the waste sulfuric acid, it was concentrated to 70% （ mass fraction） or so through distillation, and then it would be re - mixed with concentrated sulfuric acid and used for titanium dioxide production. The recovered hydrochloric acid during the distillation process could be used circularly. The back - extracted Fe^3＋ could be used as the raw material of ferric oxide red production.