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以天青石还原分解产物的浸取液(SrS)为原料,氢氧化钠为辅助化工原料制备纯度>99.70%的Sr(OH)2·8H2O。利用差示扫描量热热重法(DSC TG)对Sr(OH)2·8H2O进行非等温热分解试验研究,并用Kissinger法和Freeman Carroll法分析计算了热分解脱水反应动力学参数。结果表明:Sr(OH)2·8H2O在50℃左右开始脱水分解,至130℃以上基本完全分解成粉末状的Sr(OH)2;Sr(OH)2·8H2O的热分解过程以两个阶段进行,且两阶段吸热峰之间的温度范围小;两阶段的热分解反应表观活化能分别为E1=75.26kJ/mol,E2=95.11kJ/mol,其热分解反应级数依次为n1=1.17,n2=1.29。
Taking SrS as the raw material, the sodium lauryl sulfate was used as auxiliary chemical raw material to prepare Sr (OH) 2 · 8H2O with purity> 99.70%. The non-isothermal pyrolysis of Sr (OH) 2 · 8H2O was studied by differential scanning calorimetry (DSC TG). The kinetic parameters of thermal decomposition and dehydration were calculated by Kissinger method and Freeman Carroll method. The results show that the decomposition of Sr (OH) 2 · 8H2O begins at about 50 ℃ and decomposes to above 130 ℃. The thermal decomposition process of Sr (OH) 2 · 8H2O decomposes into two phases , And the temperature range between the two endothermic peaks is small. The apparent activation energies of two stages of pyrolysis reaction are E1 = 75.26kJ / mol and E2 = 95.11kJ / mol respectively. The order of thermal decomposition reaction is n1 = 1.17, n2 = 1.29.