Title: Method for producing calcium hydrophosphate from high-magnesium phosphorite
Application Number: 02133810 Application Date: 2002.09.26
Publication Number: 1485269 Publication Date: 2004.03.31
Approval Pub. Date: Granted Pub. Date: 2005.07.27
International Classifi-cation: C01B25/32,C01B25/222
Applicant(s) Name: Sichuan University Address: 610065
Inventor(s) Name: Zhang Zhiye, Chen Xin
Attorney & Agent: deng jihan
Abstract:
     A method of preparing calcium bicarbonate from phosphorite with the high content of magnesium, comprises, preparing a mixed acid by vitriol and an acid solution soluble for calcium to decompose phosphoritee, obtaining wet phosphorite, pre-neutralizing the wet phosphoite with milk of lime, separating coarse fertilizer, neutralizing the clear solution, controlling pH at 5.0-7.0. After filtering and drying, calcium bicarbonate (CaHPO4·H2O) for feedingstuff is produced. Magnesium ion in the mother liquid is precipitated by milk of lime, the end point pH 8.0-9.0. The invention could directly produce calcium bicarbonate (CaHPO4·H2O) for feedingstuff by phosphorite with the high content of magnesium, save the process, reduce the total investment.
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