title: Recovery and separation of sulfuric acid and iron from dilute acidic sulfate effluent and waste sulfuric acid by solvent extraction and stripping.
abstract: The recovery and simultaneous separation of sulfuric acid and iron from dilute acidic sulfate effluent (DASE) and waste sulfuric acid (WSA) have been an earnest wish for researchers and the entire sulfate process-based titanium pigment industry. To reduce the pollution of the waste acid and make a comprehensive use of the iron and sulfuric acid in it, a new environmentally friendly recovery and separation process for the DASE and the WSA is proposed. This process is based on the reactive extraction of sulfuric acid and Fe(III) from the DASE. Simultaneously, stripping of Fe(III) is carried out in the loaded organic phase with the WSA. Compared to the conventional ways, this innovative method allows the effective extraction of sulfuric acid and iron from the DASE, and the stripping of Fe(III) from the loaded organic phase with the WSA. Trioctylamine (TOA) and tributyl phosphate (TBP) in kerosene (10-50%) were used as organic phases for solvent extraction. Under the optimal conditions, about 98% of Fe(III) and sulfuric acid were removed from the DASE, and about 99.9% of Fe(III) in the organic phase was stripped with the WSA.
authors.affiliation: School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai Wenhua West Road 2, Weihai, Shandong 264209, China. Electronic address: weiqifeng163@163.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Qifeng
authors.affiliation: School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai Wenhua West Road 2, Weihai, Shandong 264209, China.
authors.forename: Ren
authors.initials: R
authors.lastname: Xiulian
authors.affiliation: School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai Wenhua West Road 2, Weihai, Shandong 264209, China.
authors.forename: Guo
authors.initials: G
authors.lastname: Jingjing
authors.affiliation: School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai Wenhua West Road 2, Weihai, Shandong 264209, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Yongxing
keywords: Iron; Solvent extraction; Sulfuric acid; Tributyl phosphate; Trioctylamine