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An Investigation Study on the Effect of Brine Composition on Silica Dissolution

机译：盐水组合物对二氧化硅溶解的调查研究

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The theory of silica-water system or silica solubility is quite complex as it involves dissolution, polymerization and precipitation processes to form the silicate scale. The type and amount of silicate scale observed is dependent on several factors including pH, salinity, magnesium concentration, and the ratio of calcium to magnesium. This paper describes the impact of brine salinity and composition on silica solubility using crash quartz sandstone core samples. Synthetic brine with different salinities ranged between 20,000ppm to 60,000ppm were utilized to determine the change in soluble silica at 80°C. The amount of silica dissolved from the sandstone sample was measured using Silicomolybdate method and confirmed by applying Energy Dispersive X-RAY and X-RAY Diffraction techniques. The results indicated that the brine composition have a significant effect on the silica solubility. 41.0mg/L of silica was dissolved with the use of 20,000ppm NaCl brine while 60,000ppm brine dissolved 67.8mg/L. It was also observed that addition of hardness to the brine would greatly increase the silica solubility. This has been confirmed by analysing the samples before and after saturation by the use of Energy Dispersive X-RAY.
机译：二氧化硅 - 水系统或二氧化硅溶解度非常复杂，因为它涉及溶解，聚合和沉淀过程以形成硅酸盐量表。观察到的硅酸盐量表的类型和量取决于包括pH，盐度，镁浓度的若干因子和钙与镁的比例。本文介绍了使用碰撞石英砂岩核心样品对盐水盐度和组成对二氧化硅溶解度的影响。具有不同薪水的合成盐水在20,000ppm至60,000ppm之间，用于确定在80℃下可溶性二氧化硅的变化。使用硅钼酸盐法测量从砂岩样品中溶解的二氧化硅的量，并通过施加能量分散X射线和X射线衍射技术来证实。结果表明，盐水组合物对二氧化硅溶解度具有显着影响。用20,000ppm NaCl盐水溶解41.0mg / L二氧化硅，而60,000ppm盐水溶解67.8mg /升。还观察到，向盐水中添加硬度将大大增加二氧化硅溶解度。通过使用能量分散X射线之前和之后通过使用能量分散X射线在饱和之前和之后分析了这一点。

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