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目前制取过磷酸钙的原料,一般都用工业部门的废硫酸与磷矿石加工产品.这种肥料中的成分和性质有所改变,不仅具有过磷酸钙的磷素养分,也含有废酸中的各种成分,酸味很浓,吸湿性强,呈深灰色稀泥,堆放后脱水变成硬块,属于土制过磷酸钙磷肥.不仅直接施用有困难,肥效不高,而且由于游离酸多,易烧种、烧苗.如将它制成氨化过磷酸钙,肥料性质就能改变,成为以磷保氮、以氮促磷的氮磷复合肥,效果较好.一、氨化过磷酸钙的制造原理过磷酸钙的氨化作用包括两个反应,一方面氨可以中和游离酸中的游离磷酸,形成磷酸二氢铵,同时使部分磷酸一钙变为磷酸二钙和磷酸二氢铵.氨化过磷酸钙的物理性状良好,具有疏松、干燥、不结块,便于运输、贮藏,不腐蚀袋子,施用时容易撒开等优点.
The current preparation of superphosphate raw materials, are generally used in the industrial sector of waste sulfuric acid and phosphate rock processed products.The composition and properties of this fertilizer have changed, not only with superphosphate phosphorus nutrients, but also contains waste acid In a variety of ingredients, the sour taste is very strong, hygroscopic, dark gray mud, dehydrated into hard lumps after accumulation, belonging to the soil-made superphosphate phosphate fertilizer not only direct the application of fertilizer is not high, but also because of free acid, Easy to burn seed, burned seedlings. If it is made of ammoniated superphosphate, the nature of the fertilizer can be changed to become nitrogen and nitrogen phosphorus to phosphorus and nitrogen phosphorus fertilizer, the better. Calcium manufacturing principles Ammonium sulfate overgalling includes two reactions, on the one hand, ammonia can neutralize the free acid in the free acid to form ammonium dihydrogen phosphate, while part of the monocalcium phosphate into dicalcium phosphate and dihydrogen phosphate Ammonium superphosphate physical properties of good, with loose, dry, non-caking, easy to transport, storage, non-corrosive bags, easy to spread when applied and so on.