Factors affecting the solubility of gypsum. The effect of lime and temperature in different media |
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| Authors: | Hanaa Y. Ghorab Marguerite Wassef Safaa H. El Abou Fetouh |
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| Affiliation: | Department of Chemistry, University College for Girls, Ain Shams University, Heliopolis, Cairo, Egypt |
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| Abstract: | The effect of lime on the solubility of gypsum in water and in sodium hydroxide solution at 30, 60 and 100°C has been studied turbidimetrically and by means of X-ray diffraction analysis. Lime depressed the solubility of gypsum in water only slightly at 30°C and a rise of temperature minimised its effect until its complete elimination. In the absence of alkali the minimum sulphate ion concentration in a supersaturated lime solution and at temperatures in the range 30–100°C is about 1.2gdm−3. In sodium hydroxide solution neither lime nor temperature played a significant role and the solubility of gypsum was clearly promoted. At temperatures in the range 30–100°C, 0.5g of gypsum dissolved in 100cm3 of 0.2MNaOH solution. |
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| Keywords: | Solubility of gypsum effect of lime and temperature setting behaviour of Portland cement |
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