论文部分内容阅读
对钙钛矿(CaTiO_3)硫酸化分解,使钛组分转化为假板钛矿(Fe_2TiO_5)的反应体系进行分析,结果表明,采用在CaTiO_3/Fe SO4体系中通入SO_2+O_2混合气体的方法可以将钛组分一步转化为假板钛矿。基于此,考察了反应温度、配料比、气相中SO_2浓度以及反应时间等因素对硫酸化转化的影响。研究表明,在反应温度1 473 K、SO_2浓度为25%(体积分数)、反应时间120 min、CaTiO_3/Fe SO_4摩尔比1∶2.1条件下,钙钛矿中92%的钛组分可以转化成为假板钛矿;钙钛矿硫酸化分解机理随温度而变化,在温度为973~1 373 K时,钙钛矿是按照CaTiO_3+SO_2+1/2O_2=Ca SO4+TiO_2进行分解,而在1 473 K时,钙钛矿是按照CaTiO_3+SO_2+1/2O_2+Fe_2O_3=Ca SO4+Fe_2TiO_5进行分解。
The reaction system for the sulfation and decomposition of perovskite (CaTiO_3) and the conversion of titanium into tantalite (Fe_2TiO_5) was analyzed. The results show that the method of introducing SO_2 + O_2 into CaTiO_3 / FeSO_4 system The titanium component can be converted to tialite in one step. Based on this, the influence of reaction temperature, the ratio of ingredients, the concentration of SO2 in the gas phase and the reaction time on the conversion of sulfated was investigated. The results show that 92% of the titanium components in perovskite can be transformed into (1) 473 K, 25% (SO_2) concentration, 120 min reaction time and CaTiO 3 / Fe SO 4 molar ratio of 1: 2.1. The mechanism of sulphation and decomposition of perovskites varies with temperature. At temperatures of 973-1 373 K, the perovskites decompose according to CaTiO 3 + SO 2 + 1 / 2O 2 = Ca SO 4 + TiO 2, while at 1 At 473 K, perovskites decompose according to CaTiO_3 + SO_2 + 1 / 2O_2 + Fe_2O_3 = CaSO_4 + Fe_2TiO_5.