文献类型：期刊文献

英文题名：Preparation of high-purity magnesia spinel refractory raw materials with spinel-wrapped periclase structures using bischofite from salt lake

作者：Liu, Qingzhu[1];Zhang, Ye[1,2];Yue, Yiming[3];Zhong, Herui[4];Zhou, Kailin[5];Du, Yuxuan[5];Yu, Jianguo[1,3]

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;[2]Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Sch Pharm, Shanghai 200237, Peoples R China

年份：2024

卷号：12

期号：6

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20243917082673);WOS:【SCI-EXPANDED(收录号:WOS:001321206700001)】；

基金：The work was financially supported by the National Natural Science Foundation of China (52204268) , China Postdoctoral Science Founda-tion (2023M741173) , and Undergraduate innovation and entrepre-neurship training program of East China University of Science and technology (X202310251021) .

语种：英文

外文关键词：Bischofite; precipitation-vacuum sintering; impurity removal; high-purity magnesia spinel refractory raw materials; spinel-wrapped periclase structure; spinel-wrapped periclase structure

摘要：A large amount of bischofite is produced in the process of potassium extraction from salt lake, which seriously affects the ionic balance of brine system. In this study, a high-purity magnesia spinel refractory raw material with a spinel-wrapped periclase structure was directly prepared using bischofite by a precipitation-sintering approach. A coupling process of one-time crude magnesium chloride solution recrystallization and three-time precipitates washing was employed to remove crucial impurities (sodium, potassium, boron, etc.) and prepare the magnesium hydroxide precipitates with a high purity of 99.37 %. The lightly calcined magnesia gained from the high-purity magnesium hydroxide precipitates and white corundum were then employed for preparing the refractory raw materials. The effects of particle size and dosage of white corundum on the phase distribution, microstructure, and physical properties of the materials were thoroughly studied. The results illustrated that the prepared refractory raw materials were mainly composed of periclase and spinel phases, showing a distinct spinel-wrapped periclase structure that could enhance the physical properties. Therefore, the prepared refractory raw materials showed a high bulk density of 3.46 gcm(-3), a low apparent porosity of 2.46 %, and a linear shrinkage rate of 12.33 %, under the optimum conditions of white corundum particle size of 3.00 mu m and alumina/magnesia mass ratio of 3:10.