Dissolution Kinetics of Magnesium from Calcined Serpentine in NH4Cl Solution
Dissolution Kinetics of Magnesium from Calcined Serpentine in NH4Cl Solution
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DOI：
10.1021/ie4043533
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发表时间：
2014-04
影响因子：
4.2
通讯作者：
Wen-cheng Gao;J. Wen;Zhibao Li
中科院分区：
文献类型：
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作者：
Wen-cheng Gao;J. Wen;Zhibao Li
提出了利用可循环NH3从蛇纹石中提取镁制备镁化合物的工艺。这一过程包括烧制蛇纹石；将镁通过NH4Cl浸出得到富NH3和富mgcl2溶液，并通过加注NH3从富mgcl2精制溶液中析出Mg(OH)2。综合考察了焙烧温度、焙烧时间、焙烧粒度、NH4Cl溶液浓度、固液比、浸出温度等因素对焙烧蛇纹石中镁溶解动力学的影响。结果表明，通过去除反应体系中产生的NH3，提高了镁的提取率。结果表明，蛇纹石中提取镁的最佳工艺条件为：焙烧温度700℃，焙烧时间1 h，粒度分数- 0.20 + 0.10 mm，氯化铵初始浓度4.0 M，料液比20/500 g/mL，反应温度0。
A process of extracting magnesium from serpentine to produce Mg compounds by using recyclable NH3 was proposed. This process includes calcination of serpentine; dissolution of magnesium by NH4Cl leaching to obtain NH3 and MgCl2-rich solution, and precipitation of Mg(OH)2 from refined MgCl2-rich solution by feeding NH3. The effects of various factors, such as roasting temperature and time, particle size, concentration of NH4Cl solution, solid-to-liquid ratio, and leaching temperature, on the dissolution kinetics of magnesium of the calcined serpentine were comprehensively investigated. It is found that the extraction rate of magnesium was enhanced by the removal of NH3 generated from the reaction system. Thus, the obtained optimum conditions for magnesium extraction from serpentine are a roasting temperature of 700 °C, a roasting time of 1 h, a particle size fraction of −0.20 + 0.10 mm, an initial ammonium chloride concentration of 4.0 M, a solid-to-liquid ratio of 20/500 g/mL, and a reaction temperature o...