The solubility of quartz in water in the temperature interval from 25° to 300° C
The solubility of quartz in water in the temperature interval from 25° to 300° C
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DOI：
10.1016/0016-7037(62)90027-3
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发表时间：
1962-10
影响因子：
5
通讯作者：
G. W. Morey;R. Fournier;J. J. Rowe-J.
中科院分区：
文献类型：
--
作者：
G. W. Morey;R. Fournier;J. J. Rowe-J.
通过三组实验研究了石英在水中的溶解度 1.(1) 在 1000 atm P H 2 O 和 45° 至 300° C 温度范围内 2.(2) 在适合气态水、液体和石英三相共存的水压下，在 69° 至 240° C 温度范围内 3.(3) 对在水中连续翻滚的石英颗粒溶解情况进行长期研究室温下的水。在温度高于 100°C 的几天内获得与石英平衡的饱和二氧化硅溶液。平衡通过不同持续时间运行的可重复结果以及通过石英从最初过饱和溶液中的沉淀来显示。从 1000 atm 压力下获得的数据得出的溶解差热为 5.38 kcal/mole。在室温和压力下，通过以 75 转/分钟的速度连续旋转塑料瓶中的石英颗粒和水，获得高度过饱和的二氧化硅溶液。在一次运行中，溶液中二氧化硅的含量在 370 天后增加到最大值 395 ppm。另一次运行在 386 天后达到 80 ppm 二氧化硅，然后降至 6 ppm 二氧化硅。结论是，石英在室温下从该过饱和溶液中沉淀出来，并且 6 ppm 基本上是石英在 25°C 下的真实溶解度。与以 75 转/分钟旋转的运行相比，石英颗粒以及二氧化硅玻璃颗粒在水中以 1·2 转/分钟连续旋转，一年后各自向溶液中贡献了小于 1 ppm 的比色二氧化硅。因此，需要剧烈搅拌液体以从石英和玻璃表面附近除去溶解的二氧化硅。可能有助于在室温下以 75 转/分钟旋转的运行中形成过饱和二氧化硅溶液的两个重要因素是 1.(1) 破碎石英颗粒表面的应力和结构不规则性，这比结晶良好的石英更容易将二氧化硅引入溶液中。 2.(2) 溶解的二氧化硅聚合成适合充当石英生长核的物质的速率非常慢。在以 75 转/分钟旋转的运行结束时，许多石英颗粒上出现了尖峰状突起。这些被解释为表明磨损并不是所获得的大过饱和度的主要原因。
The solubility of quartz in water was investigated by three sets of experiments 1.(1) at 1000 atm P H 2 O and temperatures ranging from 45° to 300° C 2.(2) at water pressures appropriate for the coexistence of three phases, gaseous water, liquid, and quartz, at temperatures ranging from 69° to 240° C 3.(3) a long term study of the dissolution of quartz grains which were continuously tumbled in water at room temperature. Saturated silica solutions in equilibrium with quartz were obtained in a few days at temperatures above 100° C. Equilibrium is shown by reproducible results for runs of different durations and by the precipitation of quartz from initially supersaturated solutions. The differential heat of solution derived from the data obtained at 1000 atm pressure is 5.38 kcal/mole. At room temperature and pressure, highly supersaturated silica solutions were obtained by continuously rotating quartz grains and water in plastic bottles at 75 rev/min. In one run the amount of silica in solution increased to a maximum value of 395 ppm after 370 days. Another run reached 80 ppm silica after 386 days and then dropped to 6 ppm silica. It is concluded that quartz was precipitated at room temperature from this supersaturated solution and that 6 ppm is essentially the true solubility of quartz at 25° C. In contrast to the runs rotated at 75 rev/min, quartz grains, and also silica glass grains, continuously rotated in water at 1 2 rev/min, each contributed less than 1 ppm colorimetric silica into solution after 1 year. Thus, vigorous agitation of the liquid is necessary to remove dissolved silica from the vicinity of surfaces of both quartz and glass. Two significant factors that may have contributed to the formation of supersaturated silica solutions in the runs rotated at 75 rev/min at room temperature are 1.(1) stresses and structural irregularities at the surfaces of the crushed quartz grains, which contributed silica into solution more readily than well crystallized quartz 2.(2) the very slow rate at which dissolved silica polymerizes to species appropriate to act as nuclei for quartz growth. At the termination of the runs rotated at 75 rev/min, spikelike projections were present on many of the quartz grains. These are interpreted as indicating that abrasion was not the dominant cause for the great supersaturations which were obtained.