混酸法制取高浓度富过磷酸钙的实验研究

Experimental Study for Manufacture of High Analysis Enriched Superphosphate by Mixed Acid Process

介绍采用磷酸、硫酸混合分解磷矿粉制高浓度富过磷酸钙[W(P2O5)-34％]的实验过程,研究磷酸替代率、混酸浓度、混酸温度、混酸用量等工艺条件对磷矿分解率的影响。通过实验,得到制备富过磷酸钙的较优工艺条件：磷酸替代率55％-58％,混酸浓度(H3PO4+H2SO4)64％-69％,混酸温度90℃-95℃,混酸用量为理论酸用量的93％-98％。

The experiment is introduced for high analysis enriched superphosphate （available W（P2O5 ）- 34% ）by phosphoric and sulfuric acid mixture decomposing ground phosphate rock. The influences of alternated phosphoric acid amount, mixed acid concentration, temperature and con - sumption on acidulated rate of phosphate rock are discussed. The optimum technological parameters are also determined by experiments for mixed acid （H3PO4 ＋ H2SO4） 64 % - 69 %, temperature 90℃- 95℃, alternated rate of phosphoric acid 55 % - 58 %, mixed acid consumption 93%-98% theoretical acid consumption.