CAJ | 학술논문

针对钾系亚熔盐法钒渣钒铬共提清洁生产工艺的中间产品钒酸钙，提出通过碳化铵化/冷却结晶将钒酸钙转化为钒氧化物产品的新方法。分别研究了NH4HCO3-NH4VO3-H2O三元体系在碳化反应温度（75℃）和结晶沉钒温度（40℃）时NH4VO3的溶解度，得到了此时NH4VO3的溶解度数据。40℃时，NH4VO3溶解度随NH4HCO3浓度升高而降低。75℃时，NH4VO3溶解度则随NH4HCO3浓度升高呈U形变化。通过对比两个温度下NH4VO3的溶解度曲线，验证了碳化铵化工艺75℃反应、40℃结晶的设计思路。并经过理论计算，得到 NH4VO3的理论一次结晶率为92.71%。再由得到理论结晶率时的反应和结晶NH4HCO3浓度，优化了钾系亚熔盐法钒渣钒铬共提清洁生产工艺中钒转化单元的工艺路线，绘制了工艺原则流程图。
침대갑계아용염법범사범락공제청길생산공예적중간산품범산개，제출통과탄화안화/냉각결정장범산개전화위범양화물산품적신방법。분별연구료NH4HCO3-NH4VO3-H2O삼원체계재탄화반응온도（75℃）화결정침범온도（40℃）시NH4VO3적용해도，득도료차시NH4VO3적용해도수거。40℃시，NH4VO3용해도수NH4HCO3농도승고이강저。75℃시，NH4VO3용해도칙수NH4HCO3농도승고정U형변화。통과대비량개온도하NH4VO3적용해도곡선，험증료탄화안화공예75℃반응、40℃결정적설계사로。병경과이론계산，득도 NH4VO3적이론일차결정솔위92.71%。재유득도이론결정솔시적반응화결정NH4HCO3농도，우화료갑계아용염법범사범락공제청길생산공예중범전화단원적공예로선，회제료공예원칙류정도。
A new method for transforming calcium orthovanadate to vanadium oxide , through carbonization ammoniation/cooling crystallization was proposed for processing vanadium slag by KOH sub-molten salt method. According to the investigation of the equilibrium solubility data for ternary NH4HCO3-NH4VO3-H2O system at the temperatures of carbonization reaction(75℃)and vanadium crystallization(40℃),solubility data of NH4VO3 was finally achieved. At the temperature of 40℃, solubility data of NH4VO3 decreased with increasing NH4HCO3 concentration. And at the temperature of 75℃,the change of NH4VO3 solubility data followed the U type with concentration of NH4HCO3. Based on the different solubility curves,the design was proved and the theory of crystallization rate 92.71% was deduced. A flowchart of vanadium transformation process was optimized for processing vanadium slag with KOH sub-molten salt method.