FIELD: building materials. SUBSTANCE: method involves treatment of nepheline with preliminary heated up to 70-105 C phosphoric acid at concentration 36-47% P2O5 and separation of insoluble residue. Treatment is carried out by continuous feeding of nepheline to acid at the rate 0.4-0.8 g/min per 1 mole P2O5. Method is used for phosphate binder components. EFFECT: increased degree of metal extraction, wt.-%: Al2O3 85.30; Na2O 88.9, and K2O 85.25.
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Authors
Dates
1994-11-15—Published
1992-06-15—Filed