CAJ | 학술논문

利用化学反应的标准平衡常数求得冶炼废渣熔池熔炼过程中5种金属硫酸盐(FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4)的分解压，确定硫酸盐在高温下发生分解反应的温度；采用热重(TG)及差示扫描量热(DSC)分析各金属硫酸盐的分解过程，验证热力学计算结果。结果表明，5种硫酸盐发生分解反应由易到难的顺序为 FeSO4、In2(SO4)3、Fe2(SO4)3、ZnSO4、PbSO4；热力学计算得到的相变温度、分解温度与DSC曲线吸热峰位置、TG曲线质量损失阶段相吻合，且理论计算温度比TG-DSC测定温度低7.5~283.1 K；熔炼炉温度达到1316.1 K以上可使浸锌渣、沉铁渣中的硫酸盐分解脱硫较彻底。
이용화학반응적표준평형상수구득야련폐사용지용련과정중5충금속류산염(FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4)적분해압，학정류산염재고온하발생분해반응적온도；채용열중(TG)급차시소묘량열(DSC)분석각금속류산염적분해과정，험증열역학계산결과。결과표명，5충류산염발생분해반응유역도난적순서위 FeSO4、In2(SO4)3、Fe2(SO4)3、ZnSO4、PbSO4；열역학계산득도적상변온도、분해온도여DSC곡선흡열봉위치、TG곡선질량손실계단상문합，차이론계산온도비TG-DSC측정온도저7.5~283.1 K；용련로온도체도1316.1 K이상가사침자사、침철사중적류산염분해탈류교철저。
The decomposition pressures of five metal sulfates (FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4) in smelting slag were calculated with the standard equilibrium constants of related chemical reactions and the sulfate decomposition temperatures were obtained by the pressures. The metal sulfates decomposition was investigated through thermogravimetric (TG) and differential scanning calorimetry (DSC), and the TG-DSC analysis confirmed the results of thermodynamic calculation. The results show that the ability of metal sulfate decomposition can be ordered as follows (from easy to difficult): FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4. The phase transition and decomposition temperatures from thermodynamic calculation are consistent with TG-DSC results. The calculated temperatures are lower than those from TG-DSC, and the difference is from 7.5 to 283.1 K. The sulfates in zinc leaching residue and iron sinking slag will decompose more thoroughly when the furnace temperature is above 1316.1 K.