CAJ | 학술논문

为了给含高浓度硫酸根离子的重金属废水中和法处理提供理论指导,并更好地理解硫酸钙结垢的形成机制,采用Pitzer电解质溶液理论计算298.15 K时CaSO4-Ca(OH)2-H2O三元体系的溶解度,并采用光学法结合XRD测试技术测定该体系的等温平衡溶解度,采用计算和实验方法分别绘制相图.研究了5个区域的物理定义及特征点、线所表达的物理规律,并分析了各区域sO2-4浓度对中和水解过程pH调节的影响.中和水解过程pH值的调节取决于体系中sO2-4离子的浓度.Ca(OH)2与CaSO4·2H2O在水中溶解时,相互影响的规律体现在相图中的点、线及面上.
위료급함고농도류산근리자적중금속폐수중화법처리제공이론지도,병경호지리해류산개결구적형성궤제,채용Pitzer전해질용액이론계산298.15 K시CaSO4-Ca(OH)2-H2O삼원체계적용해도,병채용광학법결합XRD측시기술측정해체계적등온평형용해도,채용계산화실험방법분별회제상도.연구료5개구역적물리정의급특정점、선소표체적물리규률,병분석료각구역sO2-4농도대중화수해과정pH조절적영향.중화수해과정pH치적조절취결우체계중sO2-4리자적농도.Ca(OH)2여CaSO4·2H2O재수중용해시,상호영향적규률체현재상도중적점、선급면상.
In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate,and to better understand the mechanism of calcium sulfate scale formation,the equilibrium solubility data of CaSO4-Ca(OH)2-H2O system at 298.15 K were theoretically calculated via the Pitzer semi-empirical ion-interaction theory,and determined experimentally by the optical method combining with X-ray diffractometry,and the calculated and determined phase diagrams of CaSO4-Ca(OH)2 H2O system were plotted and compared.Physical definition of each area was studied,and the physical law of characteristic point and line was explained in detail.Adjusting the pH value of neutralization-hydrolysis solution depended on the SO42- concentration in the system.And interaction characteristics between the solubilities of CaSO4(s) and Ca(OH)2(s) were found out.