A producing method of a phosphorus-calcium highly-water-soluble fertilizer

Abstract

The invention discloses a producing method of a phosphorus-calcium highly-water-soluble fertilizer and belongs to the technical field of fertilizers. The method includes steps of: a) adding a calcium-containing compound into a raw material that is wet-process phosphoric acid, reacting, filtering, adding a sulfide into the acid solution after filtration, reacting and filtering; b) subjecting the acid solution treated by the step a) and a raw material that is powdered rock phosphate to an acidolysis reaction, with the using amount of phosphoric acid being more than 500% of a theoretical reaction amount; c) thickening by maintaining the temperature of the slurry after acidolysis; d) transferring the supernatant liquid after thickening into a cooling and crystallizing tank, cooling and crystallizing, and performing solid liquid separation; e) adding water into filter residue of the step d) to prepare slurry, and thickening by maintaining the temperature; and f) transferring the supernatant liquid after thickening to a dryer having high-temperature air streams, and drying to obtain a product that is the phosphorus-calcium highly-water-soluble fertilizer. The method can control the content of water insoluble compounds of the product to be less than 3% and the main content to be higher than 98%, and is low in cost, high in phosphorus utilization rate and less in residue discharge.

Description

technical field

[0001] The invention belongs to the technical field of fertilizers, and in particular relates to a method for producing fertilizers with high phosphorus and calcium water-soluble properties. Background technique

[0002] Water-soluble fertilizer (WaterSolubleFertilizer, WSF), referred to as water-soluble fertilizer, is a multi-component compound fertilizer that can be completely dissolved in water. It has good water solubility and no residue, and can be quickly dissolved in water. Compared with fertilizers and other varieties, water-soluble fertilizers have obvious advantages, and are easier to be absorbed by crops, and their absorption and utilization rate is relatively high. More importantly, they can be applied to agricultural facilities such as sprinkler irrigation and drip irrigation, so as to realize the simultaneous application of water and fertilizer. Fertilizer, water and fertilizer are integrated to achieve the efficiency of saving water, fertilizer...

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