CAJ | 학술논문

根据硅镁型红土镍矿中镁硅酸盐存在形式，采用化学沉淀法合成MgSiO3，通过正交实验考察反应温度、反应时间、液固比和NaOH浓度对MgSiO3在NaOH亚熔盐体系中的浸出过程的影响，得出优化实验条件为：反应温度为210℃，反应时间为180min，液固比为6：1，NaOH浓度为80%。在优化实验的基础上，采用Raman光谱对反应过程进行在线检测，利用XRD和IR光谱分析反应后的水浸渣结构变化，解析MgSiO3在NaOH亚熔盐体系中的反应机理。结果表明：在反应过程中，SiO4中的Si—O被破坏，NaOH介入硅酸盐晶格中，其中间产物为Mg2SiO4和Na2MgSiO4，Mg2+经过碱浸过程可以脱离SiO4阵列，以Mg(OH)2形式从其硅酸盐中得以释放。
근거규미형홍토얼광중미규산염존재형식，채용화학침정법합성MgSiO3，통과정교실험고찰반응온도、반응시간、액고비화NaOH농도대MgSiO3재NaOH아용염체계중적침출과정적영향，득출우화실험조건위：반응온도위210℃，반응시간위180min，액고비위6：1，NaOH농도위80%。재우화실험적기출상，채용Raman광보대반응과정진행재선검측，이용XRD화IR광보분석반응후적수침사결구변화，해석MgSiO3재NaOH아용염체계중적반응궤리。결과표명：재반응과정중，SiO4중적Si—O피파배，NaOH개입규산염정격중，기중간산물위Mg2SiO4화Na2MgSiO4，Mg2+경과감침과정가이탈리SiO4진렬，이Mg(OH)2형식종기규산염중득이석방。
Based on the existence form of MgSiO3in garnierite, MgSiO3 was synthetized through chemical precipitation method. Through the orthogonal experimentation, the effects of reaction temperature, reaction time, liquid-to-solid ratio and concentration of NaOH on the leaching process of MgSiO3 in NaOH sub-molten salt system were observed, and the optimal experimental conditions include reaction temperature of 210℃, reaction time of 180 min, liquid-to-solid ratio of 6:1, and concentration of NaOH of 80%. Based on the optimized experiment, on-line detection for the reaction process was made by using Raman spectroscopy, XRD and IR were used to analyze the structural change of water leaching residue and explore the reaction mechanism of MgSiO3 in NaOH sub-molten salt system. The results show that, during the reaction process, the Si—O bond in the SiO4 is destroyed and the NaOH inserts itself into the silicate lattice, producing intermediate Mg2SiO4and Na2MgSiO4 products. After the alkali leaching process, Mg2+ can be separated from SiO4 array, which can be released out of the silicate in the form of Mg(OH)2.