Applicant: Wang Delin-application date: 1998- 12-28- main classification number: C0 1F 17/00.
Abstract: The invention relates to a rare earth additive, a preparation method thereof and a method for preparing rare earth phosphate fertilizer by using the rare earth additive. Rare earth minerals are roasted, acid leached, alkali transformed, dissolved and crystallized to prepare rare earth additives. Rare-earth additives are uniformly added through a vibrating feeder in the process of slurry mixing or sulfuric acid addition in phosphate fertilizer production, and react with sulfuric acid to produce rare-earth phosphate fertilizer.