卤水与纯碱工业蒸氨汽制备高纯氧化镁前驱体研究

以卤水与纯碱工业蒸氨汽(氨气和二氧化碳的混合气,体积比为5∶1)为原料制备高纯氧化镁前驱体,以净化后卤水的波美度、物料比、水热反应温度、纯化时间以及纯碱蒸氨汽的通气速率5个因素,设计5因素4水平正交试验,并通过X射线衍射和扫描电子显微镜对产物进行表征。结果表明,在卤水的波美度为25.1Bh、物料比为3∶1、反应温度为70℃、纯化时间为0.5 h、通气速率为50 ml/h的条件下可以制备出较好的4MgCO_3·Mg(OH)_2·4H_2O晶体。影响氧化镁转化率的主次因素依次为物料比、卤水波美度、反应温度、通气速率、纯化时间。

Preparation of High Purity MgO Precursor with Brine and Industrial Ammonia Gas

High purity MgO precursor was prepared from the brine and industrial ammonia gas (a mix with NH3:CO2 =5:1).A L16 (45) orthogonal experiment was used to rank the influence of 5 parameters (baume degree,brine and gas ratio,temperature,purification duration and gas adding velocity) on the production.The product was characterized by X-ray diffraction (XRD) and electron microscope (EM).The results suggested that when baume degree was 25.1,brine and gas ratio was 3:1,temperature was 70 ℃C,purification duration was 1.5 h,and gas adding velocity was 50 ml/h,the product 4MgCO3 · Mg (OH)2 · 4H2O was in better condition and was very suitable to prepare high purity MgO in following step.In addition,the influence of 5 parameters from high to low were brine to gas ratio,baume degree,temperature,gas adding velocity and purification duration.