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粉状水溶肥多采用工业级KH_2PO_4、NH_4H_2PO_4等高端原料进行掺混,成本高。采用湿法磷酸为原料,经过脱氟、脱硫、压滤、氨中和等步骤得到磷酸一铵溶液,再加入定量的硝酸钾,经浓缩、喷雾干燥得到高磷高钾的硝基水溶肥。介绍高磷高钾硝基水溶肥的生产工艺流程、投料方案。该方法流程简短,生产成本低,可以直接将磷铵装置改造进行生产,投资少,产品养分和水不溶物均达到国家标准。
Powder water soluble fertilizer and more use of industrial grade KH_2PO_4, NH_4H_2PO_4 and other high-end raw materials for blending, high cost. Wet phosphoric acid is used as raw material to obtain ammonium phosphate monohydrate solution through defluorination, desulfurization, pressure filtration, ammonia neutralization and the like, then the quantitative potassium nitrate is added, and concentrated and spray-dried to obtain high-phosphorus and high-potassium nitro water soluble fertilizer. Introduce the production process and feeding scheme of high phosphorus and high potassium nitro water soluble fertilizer. The method has the advantages of simple process, low production cost, direct transformation of ammonium phosphate plant for production, less investment, product nutrient and water insoluble matter meeting the national standards.