文献类型：期刊文献

英文题名：Effects of Flotation Reagents on the Morphology of Magnesium Hydroxide: Experimental and Simulation Study

作者：Shi, Xiaoyan[1];Chen, Hang[1];Sun, Yuzhu[1];Song, Xingfu[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Joint Int Lab Potassium & Lithium Strateg Resource, Shanghai 200237, Peoples R China

年份：2023

卷号：62

期号：23

起止页码：9246

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20232614321254);WOS:【SCI-EXPANDED(收录号:WOS:001008139500001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (Grant No. 2018YFC0604802).

语种：英文

外文关键词：Chlorine compounds - Crystal impurities - Crystals - Flotation - Growth rate - Molecular dynamics - Morphology - Sodium hydroxide

摘要：The flotation process to extract potassium salt fromcarnalliteores could produce the MgCl2 mother liquor with flotation reagents-octadecyl amine hydrochloride (ODA) and dodecyl morpholine(DMP). The organic impurities would further affect MgCl2 resource-integrated utilization for preparing magnesium hydroxide (MH). In this study, the effects of flotation reagents with differentconcentrations on the morphology of MH were investigated at a hydrothermaltemperature of 200 degrees C for 6 h with the hydrothermal medium ofa 4 mol/L NaOH solution. It was observed that the average thicknessof MH crystal plates increased and the morphology of crystals changedfrom regular hexagonal plates to irregular polygonal plates with theincrease of ODA and DMP concentrations. Molecular dynamics (MD) simulationwas applied to further explain the effect mechanism. The results indicatedthat ODA and DMP molecules were more likely to be adsorbed on the(1 1 0) plane in contrast to the (0 0 1) plane due to the larger absolutevalues of adsorption energy on the (1 1 0) plane. The long carbonchains far away from the (1 1 0) plane would form steric hindranceto affect the growth rate of MH crystals in the [1 1 0] direction.