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钙镁磷肥是南方红、黄壤酸性土壤分布地区最理想的磷肥品种之一。它与过磷酸钙不同,过磷酸钙是磷矿石粉与浓硫酸按一定比例制成的水溶性酸性肥料;钙镁磷肥却是磷矿石和蛇纹石(或橄榄石)等含镁矿物按一定比例、在高炉中经1300～1450℃高温熔融,然后加水骤冷,再经磨细而成的弱酸溶性的碱性肥料。成份与作用在成分上,过磷酸钙除含有五氧化二磷16～20%外,尚含有40%左右的硫酸钙。钙镁磷肥成分就复杂
Calcium magnesium phosphate fertilizer is one of the most ideal phosphate fertilizer varieties in southern red and yellow soil acidic soil distribution areas. It is different from superphosphate, superphosphate is phosphate rock phosphate and concentrated sulfuric acid made of a certain percentage of water-soluble acidic fertilizer; calcium magnesium phosphate is phosphate rock and serpentine (or olivine) and other magnesium-containing minerals according to certain Ratio, in the blast furnace by 1300 ~ 1450 ℃ high temperature melting, and then quenched with water, and then by the weak acid-soluble alkaline fertilizer. Composition and role In the composition, in addition to containing more phosphorus pentoxide P2O5 16 ~ 20%, still contains about 40% of the calcium sulfate. Calcium magnesium phosphate composition is complicated