Systems and methods to treat flue gas desulfurization waste to produce ammonium sulfate and calcium carbonate products
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United States of America Patent
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Oct 19, 2021
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Jul 30, 2020
app pub date -
Jan 22, 2020
filing date -
Jan 24, 2019
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Abstract
Disclosed herein are system and methods for producing a high purity ammonium sulfate product as well as either a lower or a high purity calcium carbonate product by reacting flue gas desulfurization (FGD) gypsum feedstock in batch or continuous mode using synthesized ammonium carbonate from ammonia and carbon dioxide gases. The high purity calcium carbonate is obtained by using a precipitation catalyst, filtering out the impurities, then precipitating a high purity calcium carbonate. Alternatively, the lower purity calcium carbonate may be dissolved in acid, impurities filtered out, then a high purity calcium carbonate is precipitated out using a soluble carbonate salt.
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