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.
College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha, 410083, China.
J Environ Manage. 2019 Oct 1;247:1-8. doi: 10.1016/j.jenvman.2019.06.026. Epub 2019 Jun 20.
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 Mn 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), OL and HOL. 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.
本研究聚焦于采用凝聚-溶气浮选法去除合成锰浸出液中的油酸钠（NaOL）。研究表明，部分水解聚丙烯酰胺（HPAM）、NaOL 用量和 pH 值对 NaOL 的去除效率有多重影响。结果表明，在最佳凝聚-溶气浮选条件下，当 HPAM 用量为 20mg/L、NaOL 用量为 30mg/L、pH 值为 8.0 时，NaOL 的去除效率可达 97.6%。溶液 pH 值对油酸盐物种和 Mn 物种的分布有显著影响。HPAM 的添加有利于 OL 胶束的形成和临界胶束浓度（CMC）的降低。油酸盐物种主要存在 Mn(OL)、OL 和 HOL。HPAM 可使 NaOL 的 Zeta 电位负移。HPAM 可降低 NaOL 的 CMC，并导致其从三维网络结构向层状结构转变。NaOL 可通过 HPAM 链在浮泡表面的吸附和桥接作用，通过凝聚-溶气浮选法去除。
