INVESTIGATION OF CALCIUM SULFATE PRECIPITATION INHIBITION BY SODIUM CARBOXYMETHYLCELLULOSE AND POLYACRYLAMIDE
DOI:
https://doi.org/10.17072/2223-1838-2019-3-203-211Keywords:
calcium sulfate, gypsum, inhibitors of crystallization, carboxymethylcellulose, polyacrylamideAbstract
The influence of concentration inhibitors, calcium/sulfate ratios on the precipitation of calcium sulfate was studied. The efficiency of inhibition in the presence of carboxymethylcellulose and polyacrylamide was estimated from measurements of the calcium concentration in the supersaturated solutions during the precipitation process by the standard procedure of complexometric titration. Sodium carboxymethylcellulose with the degree of polymerization of 1000 units was found to be the most effective in preventing the crystallization gypsum. Polymer concentrations as low as 0,5 g/L increases induction time, preceding the formation of the gypsum to 200 min; 1,0 g/L increased to 600 min. Mixing of equal volumes of stock solutions of calcium chloride and sodium sulfate results in final concentration 24 g gypsum per litre solution.References
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