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为了利用硫酸分解氟化氢铵/氟化铵制氟化氢副产的酸液(称残液),实验研究残液分解磷矿制取过磷酸钙的适宜残液用量、熟化温度等对磷矿分解率及产品养分含量、性能的影响。实验结果:获得制取过磷酸钙适宜工艺条件,虽然最终磷转化率仅75%～85%,需对游离酸中和,达过磷酸钙合格品Ⅱ等品要求,但残液中有NH4+,产品总养分w(P2O5有效+N)可达到16%以上。
In order to use sulfuric acid to decompose ammonium bifluoride / ammonium fluoride hydrogen fluoride by-product of the acid (referred to as residual liquid), the experimental study of residual liquid phosphate decomposition of calcium phosphate preparation of appropriate residue amount, aging temperature and other phosphate decomposition rate and Product nutrient content, performance impact. Experimental results: To obtain the optimum conditions for the preparation of superphosphate, although the final conversion of phosphorus was only 75% to 85%, the need for neutralization of free acid, up to calcium phosphate qualified product Ⅱ and other products, but the residue in the NH4 + Total product w (P2O5 effective + N) can reach more than 16%.