Sodium Carbonate → Calcium Carbonate

Participants

Reaction Steps

To determine the effect of sodium carbonate excesses, carbonate reaction times and various levels of muds recycle on the removal of strontium and calcium from brine, separate runs are made in which 200 ml. samples of raw brine containing 25 weight percent sodium chloride, 228 ppm calcium (calculated as elemental calcium) and 15 ppm strontium compounds (calculated as elemental strontium) are contacted with the selected quantity of sodium carbonate and stirred in a 250 ml. container at approximately 300 rpm for the selected period of time to provide reaction of the sodium carbonate with dissolved calcium and strontium impurities to form strontium carbonate and calcium carbonate solids. In each run, sodium carbonate was added in an amount to provide the desired excess sodium carbonate over that stoichiometrically required to react with the dissolved strontium and calcium impurities. In the runs which employed muds recycle, a selected quantity of muds having the following analysis (dry basis) are added along with the sodium carbonate to the brine:

Provenance & Evidence