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许多实验表明,CO_2在硅酸盐熔体中具有一定的溶解度,虽然这种溶解度有限(表1)。这种溶解度取决于熔体的成分,并随温度和压力的降低而降低。由于CO_2与非桥氧起反应而生成碳酸根离子,故聚合得不太强的熔体将会溶解较大量的CO_2。因为水有助于熔体解聚,故CO_2在含水熔体中的溶解度比在同成分的无水熔体中大得多。由于CO_2在硅酸盐熔体中的溶解度比在水中低得多,故CO_2饱和的熔体的结晶温度将比水饱和的熔体的要高。此外,由于在高温、高压下CO_2在熔体中的溶解度增
Many experiments show that CO 2 has some solubility in silicate melt, although this solubility is limited (Table 1). This solubility depends on the composition of the melt and decreases with decreasing temperature and pressure. Since CO 2 reacts with non-bridging oxygen to form carbonate ions, a less polymerized melt will dissolve a larger amount of CO 2. Because water aids in melt depolymerization, the solubility of CO 2 in aqueous melts is much greater than in anhydrous melts of the same composition. Since the solubility of CO 2 in silicate melt is much lower than in water, the crystallization temperature of the CO 2 saturated melt will be higher than that of the water-saturated melt. In addition, the CO 2 solubility in the melt increases at high temperatures and pressures