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在20—100℃温度范围内,测定了在不同组成的FeCl_3-FeCl_2-HCl溶液中氯化银的溶解度,还测定了相应的饱和溶液的密度。升高温度或提高氯化物组分的浓度,氯化银的溶解度都有规律地提高。在氯化亚铁介质中,氯化银的溶解度比在等当量的氯化铁溶液中溶解度高。存在CuCl_2时,可使AgCl的溶解度有规律地提高;但增高ZnCl_2浓度会引起溶解度稍许降低,当ZnCl_2浓度达到约1.5M以后,AgCl的溶解度又逐渐提高。在所有条件下,在氯化铁或氯化亚铁介质中加入NaCl时,都会实质性地提高AgCl的溶解度。氯化银的溶解度,虽然在冷水中只有数毫克/升,但在热的、中等浓度的氯化物介质中,却可超过1克/升。氯化银在较高温度下的溶解度已足够高,因此在大多数工业规模的氯化铁浸出过程中,不会出现银的溶解度受到限制的问题。
The solubility of silver chloride in FeCl_3-FeCl_2-HCl solution with different compositions was measured in the temperature range from 20 ℃ to 100 ℃. The density of the corresponding saturated solution was also measured. Increasing the temperature or increasing the concentration of the chloride component increases the solubility of silver chloride regularly. In ferrous chloride media, the solubility of silver chloride is higher than that of an equivalent ferric chloride solution. In the presence of CuCl 2, the solubility of AgCl can be increased regularly; however, increasing the concentration of ZnCl 2 will result in a slight decrease of solubility. When the concentration of ZnCl 2 reaches about 1.5 M, the solubility of AgCl will increase gradually. Under all conditions, the addition of NaCl to the ferric chloride or ferrous chloride media will substantially increase the solubility of AgCl. The solubility of silver chloride, although only a few milligrams per liter in cold water, can exceed 1 gram per liter in hot, moderately concentrated chloride media. The solubility of silver chloride at higher temperatures is sufficiently high that there will be no problem of limiting the solubility of silver in most industrial-scale ferric chloride leaching processes.