Title: Method for producing feed calcium by acid-saving decalcification and defluorination
Application Number: 96110550 Application Date: 1996.07.13
Publication Number: 1170517 Publication Date: 1998.01.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: A23K1/175,C01B33/20,C05D3/00
Applicant(s) Name: Yan Minglang Address: 441021
Inventor(s) Name:
Attorney & Agent: HE JINGYUE
Abstract:
     Feed calcium is produced through the processes of adding potassium or sodium salt into phosphoric acid solution, defluorination and precipitate separation; adding calcium phosphate salt into deflluorinated phosphoric acid, reaction with sulfuric acid and excessive potassium or sodium salt; readding calcium compound, adding alkali to raise pH value of sodium and to remove residual fluorine in phosphoric acid and precititate separation to obtain fertilizer calcium; and adding lime emulsion into the filtrate to neutralize. In the said technological process, the amount of P2O5 entering fertilizer calcium is 5-15% and that entering feed calcium reaches 85-95%. The said technological process has low sulphuric acid and calcium oxide consumption, high product purity and low production cost.
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