氯化镁浓度对氢氧化镁晶体生长的影响

Effects of concentration of MgCl_2 on the growth of Mg(OH)_2 crystals

高活性氧化镁通过水合反应制得氢氧化镁,通过添加不同浓度的MgCl_2,研究水化剂氯化镁浓度、水化温度对氢氧化镁晶体生长的影响。粒度仪、X-射线衍射仪(XRD)和扫描电子显微镜(SEM)的检测表明,氧化镁水合制备氢氧化镁的纯度较高;水化温度70℃,氯化镁浓度低于1.00 mol/L时,产品为片状氢氧化镁;当氯化镁浓度高于1.50 mol/L时,出现条状氢氧化镁;在160℃下高温水热,均能得到片状氢氧化镁;氯化镁浓度为1.00 mol/L时,产品形貌为形状规则的片状晶体。

High-purity Mg（ OH）2could be processed by hydrothermal method,by adding different concentrations of MgCl2,researched effects of concentration of MgCl2 solution and water temperature on the growth of Mg（ OH）2crystal. The conclusions of particle size analyzer,XRD and SEM could be drawn as follow： brine pyrolysis Mg O had good activity,producted high-purity Mg（ OH）2. The product was flaky at70 ℃ in hydrothermal condition for the concentration of MgCl2 was less than 1. 00 mol / L. The product was strip in hydrothermal condition for the concentration of MgCl2 was more than 1. 50 mol / L. Flaky Mg（ OH）2can be producted at 160 ℃ in hydrothermal condition for each concentration of MgCl2. Furthermore,product was regularly crystal ribbon in hydrothermal condition for the concentration of MgCl2 was 1. 00 mol / L.