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首页> 外文会议>32nd Annual Hydrometallurgy Meeting and International Conference on the Practice and Theory of Chloride/Metal Interaction, Vol.2, Oct 19-23, 2002, Montreal, Quebec, Canada >Calcium Sulphate Solubilities in Concentrated Aqueous Chloride Solutions
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Calcium Sulphate Solubilities in Concentrated Aqueous Chloride Solutions

机译：氯化钙在浓氯化物水溶液中的溶解度

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摘要

In this paper, the solubilities of calcium sulphate dihydrate in HCl, CaCl_2 and their mixed solutions have been determined. The parameters investigated are HCl concentration up to 5M, CaCl_2 concentration up to 2M and temperature ranging from 20 to 80 ℃. The solubility has been reported to increase with the temperature increment as it does with acid concentration, reaching a maximum at about 2.5M HCl, and then it drops. At the same time, the solubility of CaSO_4.2H_2O decreases with increasing CaCl_2 concentration. In addition, the influence of co-existing metal chloride salts, such as MgCl_2, FeCl_2, FeCl_3 and AlCl_3 on the solubility of calcium sulphate was estimated by OLI and determined from 50 to 80℃. The calculated results by OLI were compared with the present experimental data and literature data. The effect of co-existing metal chloride salts on calcium sulphate solubility is a complex one depending on the propensity or not of the metal to form complexes. Thus, in the case of divalent chlorides, e.g. MgCl_2 or FeCl_2, increasing salt concentration results in decreasing CaSO_4 solubility; on the other hand trivalent chloride salts, e.g. FeCl_3 and AlCl_3, cause the solubility to increase due to complex formation.
机译：本文确定了二水合硫酸钙在HCl，CaCl_2及其混合溶液中的溶解度。研究的参数为HCl浓度最高为5M，CaCl_2浓度最高为2M，温度范围为20到80℃。据报道，溶解度随温度的升高而增加，就像酸浓度一样，在约2.5M HCl时达到最大值，然后下降。同时，CaSO_4.2H_2O的溶解度随CaCl_2浓度的增加而降低。此外，用OLI估计了共存的金属氯化物盐（如MgCl_2，FeCl_2，FeCl_3和AlCl_3）对硫酸钙溶解度的影响，并在50至80℃下测定。将OLI的计算结果与当前的实验数据和文献数据进行比较。金属氯化物盐共存对硫酸钙溶解度的影响是复杂的，这取决于金属形成复合物的倾向与否。因此，在二价氯化物的情况下，例如MgCl_2或FeCl_2，增加盐浓度会导致CaSO_4溶解度降低；另一方面三价氯化物盐，例如FeCl_3和AlCl_3会由于形成复合物而导致溶解度增加。

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