Preparation method of special calcium-magnesium-rich citric acid-soluble phosphate fertilizer for macadamia nuts

The invention discloses a preparation method of a special calcium-magnesium-rich citrate-soluble phosphate fertilizer for macadamia nuts, which comprises the following steps: 1) mixing wet-process phosphoric acid sludge acid and low-grade phosphorite with the fineness of 100-200 meshes according to the mass ratio of (1-1.5): 1, and performing activation reaction at 80-90 DEG C for 45-60 minutes to obtain mixed slurry in which the citrate-soluble phosphorus accounts for 40-60%; 2) curing the mixed slurry obtained in the step 1) at a constant temperature of 45 DEG C for 8-12 hours, taking out, crushing to obtain a cured material, adding a transforming agent, and mixing with the cured material; 3) reacting at normal temperature for 2-5 hours, drying, and crushing to obtain a calcium-magnesium-rich citric acid-soluble phosphate fertilizer product; the macadamia nut compound fertilizer can also be used as a fertilizer to be directly used as a phosphorus source; compared with a method for preparing a calcium magnes