铁矾渣热分解过程研究

Thermal Decomposition Process of Jarosite Residue

采用DSC-TG和XRD分析方法对铁矾渣热分解过程进行了研究。结果表明:铁矾渣的热分解包括脱水、脱氨、氧化和晶型转变等复杂步骤;经750℃焙烧,铁矾渣呈红棕色,最终产物主要为ZnFe_2O_4和Fe_2O_3;基于Kissinger法和Flynn-Wall-Ozawa法得到铁矾渣在350~450℃和630~720℃温度区间热分解反应的活化能分别约为260和230 k J/mol,频率因子分别为3.07×10^(19)和1.29×10^(12)。

Based on the analysis using DSC-TG and XRD,the thermal decomposition process of jarosite residue is found to be composed of several steps,including dewatering,deamination,oxidation and crystal transformation. After roasted at 750 ℃,jarosite residue turned to be red brown,with Zn Fe_2O_4 and Fe_2O_3 predominantly in the end product. The jarosite residue obtained by the Kissinger method and Flynn-Wall-Ozawa method was then subjected to thermal decomposition process at the temperature range of 350 - 450 ℃ and 630 - 720 ℃,with the activation energy at around260 and 230 k J / mol,and frequency factor of 3. 07 × 10^19 and 1. 29 × 10^12,respectively.