The invention relates to the technical field of
chemical industry, and particularly relates to a production method for preparing
calcium hydrogen phosphate and by-producing a special
fertilizer for cucurbit. According to the production method, the effective absorption amount of
nitrogen,
phosphorus and
potassium elements is analyzed according to the
fertilizer requirement of cucurbit, and element content is regulated and collocated in a production process course, so that a prepared compounded-form compound
fertilizer can furthest meet the requirement of the cucurbit, excessively high cost caused due to improper element
collocation in the production of the compound fertilizer is reduced, and environmental
pollution caused by that the compound fertilizer is solidified by adding excessive elements to soil is further prevented; and a high-purity
calcium hydrogen phosphate product can be produced in the preparation process of the special fertilizer for the cucurbit by controlling the process condition of the production, so that the
impurity removal cost needed when the
calcium hydrogen phosphate product is prepared by adopting the traditional wet-process
phosphoric acid method is made up, the purity of the calcium
hydrogen phosphate product reaches more than 96%, the production cost is reduced, and outstanding economic benefit is achieved.