Removal of sodium oleate from synthetic manganese leaching solution by coagulation-dissolved air flotation

Jianrong Xue; Hong Zhong; Shuai Wang

doi:10.1016/j.jenvman.2019.06.026

Removal of sodium oleate from synthetic manganese leaching solution by coagulation-dissolved air flotation

J Environ Manage. 2019 Oct 1:247:1-8. doi: 10.1016/j.jenvman.2019.06.026. Epub 2019 Jun 20.

Authors

Jianrong Xue¹, Hong Zhong², Shuai Wang³

Affiliations

¹ College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China; College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha, 410083, China.
² College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha, 410083, China.
³ College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha, 410083, China. Electronic address: wangshuai@csu.edu.cn.

PMID: 31228698
DOI: 10.1016/j.jenvman.2019.06.026

Abstract

The coagulation-dissolved air flotation for removal of sodium oleate (NaOL) from synthetic manganese leaching solution was focused in this study. It indicates that partially hydrolyzed polyacrylamide (HPAM), NaOL dosage and pH have a multiple effect on the removal efficiency of NaOL. The results represents a significant removal efficiency of 97.6% NaOL was achieved under the optimal conditions of coagulation-dissolved air flotation by dosage of 20 mg/L HPAM and 30 mg/L NaOL, pH 8.0. Solution pH has a significant effect on the distribution of oleate species and Mn²⁺ species. The addition of HPAM facilitates the formation of OL^- micelle and the decrease of critical micelle concentration (CMC). Oleate species primarily exist, containing Mn(OL)_2(s), OL^- and HOL_(aq). HPAM could cause the Zeta potential of NaOL to shift negatively. HPAM could decrease CMC of NaOL and lead to a transition from three dimensional network structure to lamellar structure. NaOL can be removed by coagulation-dissolved air flotation through the adsorption and bridge effect of HPAM chains on the floating bubble surface.

Keywords: Coagulation-dissolved air flotation; Partially hydrolyzed polyacrylamide; Sodium oleate; Solution chemistry calculation.

MeSH terms

Adsorption
Manganese*
Oleic Acid*
Water

Substances

Water
Oleic Acid
osteum
Manganese