Ammonium sulphate with calcium carbonate as gross by-product could be obtained from the raw materials including phosphogypsum, ammonium bicarbonate and ammonia water.

• 以磷石膏、碳酸氢铵和氨水为原料制备硫酸铵,并用盐酸处理碳酸钙粗品制备氯化钙。