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金属离子与沉积碳酸盐之间界面反应动力学模拟实验表明,由于CaCO3快速溶解和溶液pH急剧上升,大部分Pb2+、Zn2+离子与溶液中CO2-3和OH-离子反应生成白铅矿PbCO3、水白铅矿Pb3(OH)2(CO3)2,或Zn(OH)2和水锌矿Zn(OH)6(CO3)2沉淀于体相溶液中,仅有少部分Pb2+、Zn2+通过扩散与CaCO3表面发生离子交换反应。25℃时,Ph2+溶液中以白铝矿沉淀为主,Zn2+溶液中以水锌矿沉淀为主。温度上升,沉淀速率加快的同时,离子交换量也增大。然而,在25℃Ag+吸附实验中,未发现有Ag2CO3沉淀。但温度上升至50℃,溶液中Ag+离子损耗明显增加,但CaCO3对Ag+离子吸附量却减少,这意味着在体相溶液中也可能有Ag2CO3沉淀产生。
The kinetic simulation of interfacial reaction between metal ions and carbonate showed that most of Pb2 + and Zn2 + ions reacted with CO2-3 and OH- ions in the solution to produce lead dioxide PbCO3 due to the rapid dissolution of CaCO3 and the rapid increase of pH. Pb3 (OH) 2 (CO3) 2 or Zn (OH) 2 and Zn (OH) 6 (CO3) 2 in the water lead precipitate in the bulk solution. Only a small part of Pb2 + and Zn2 + CaCO3 surface ion exchange reaction occurs. At 25 ℃, Ba2 + was mainly precipitated in Ph2 + solution and Zn2 + in Zn2 + solution. As the temperature rises and the rate of precipitation increases, the amount of ion exchange increases. However, Ag2CO3 precipitation was not found in the Ag + adsorption experiments at 25 ° C. However, when the temperature rises to 50 ℃, the loss of Ag + ions in the solution increases obviously, but the adsorption amount of Ca + ions to Ag + ions decreases, which means that precipitation of Ag2CO3 may also occur in the bulk solution.