中南大学学报（自然科学版）2017，Vol.48Issue(12)：3152-3159,8.DOI:10.11817/j.issn.1672-7207.2017.12.003
一水硬铝石矿-氢氧化钠-氢氧化钙体系在微波场中的物相演变
Phase transformation of the diasporic bauxite-sodium hydroxide-calcium hydroxide system in microwave heating
摘要
Abstract
A slurry mixture of diasporic bauxite and alkaline (Ca(OH)2+supersaturated NaOH solution) was roasted with microwave energy. The effects of operation parameters, such as microwave roasting temperature, NaOH amount, Ca(OH)2 amount and holding time on the phase transformation of the diasporic bauxite-NaOH-Ca(OH)2 system were investigated by X-ray diffraction analysis. The results show that increasing the microwave roasting temperature and the amounts of NaOH or Ca(OH)2, and prolonging the holding time are all favorable for the form of NaAlO2 and Ca2SiO4, and will likely improve the separating effect of aluminum-silicate minerals. However, the excess amount of Ca(OH)2 is detrimental to the phase constitution of the roasted product. The optimum conditions are obtained as follows: mole ratio nNaOH/(nAl+nFe) is 1.0;nCaO/nSiO2 is 2.0; microwave roasting temperature is 800℃ and holding time is 20 min. The roasted product obtained at the optimum conditions is porous, and its leaching effect is good.关键词
微波加热/一水硬铝石矿/相变/氢氧化钠/氢氧化钙Key words
microwave heating/diasporic bauxite/phase transformation/sodium hydroxide/calcium hydroxide分类
矿业与冶金引用本文复制引用
黎氏琼春,巨少华,彭金辉,王仕兴,周烈兴,王应兰..一水硬铝石矿-氢氧化钠-氢氧化钙体系在微波场中的物相演变[J].中南大学学报（自然科学版）,2017,48(12):3152-3159,8.基金项目
国家自然科学基金资助项目(51264022) （51264022）
2015年度云南省博士研究生学术新人奖资助项目(2015) （2015）
云南省应用基础研究计划项目(2015FA017)(Project(51264022) supported by the National Natural Science Foundation of China （2015FA017）
Project(2015) supported by the 2015 PhD Newcomer Award in Yunnan Province （2015）
Project(2015FA017) supported by Applied Basic Research Program of Yunnan Province) （2015FA017）
