论文部分内容阅读
通过对脱氟过程反应机理的探讨和试验研究 ,提出普钙法生产饲料级磷酸氢钙 ,需提高浸取液中磷的质量浓度 (P2 O5 >10 0 g/ L) ,并控制加 Ca(OH) 2 的脱氟终点 (p H=2 .6～ 2 .7) ,可使 m(P2 O5 ) / m(F)≥ 2 5 0、磷收率平均达 82 % ,饲肥比从原来 6 0∶ 40提高到 80∶ 2 0 ,产品质量稳定。并提出脱氟终点仅控制 p H,难以保证产品质量和磷收率。为此 ,研制了一种仅用 3～ 5 min快速滴定法测定 P2 O5 和 F-。
Through the discussion and experimental research on the reaction mechanism of defluorination process, it is proposed that the production of feed grade calcium hydrogen phosphate by the general calcium method should increase the phosphorus concentration (P2 O5> 10 0 g / L) in the leaching solution and control the addition of Ca OH) 2 can make m (P2 O5) / m (F) ≥250 and the average phosphorus yield reaches 82% 6 0:40 increased to 80: 2 0, product quality and stability. It is also suggested that the end point of de-fluorination only controls p H, so it is difficult to ensure product quality and phosphorus yield. To this end, developed a rapid titration only 3 ~ 5 min determination of P2 O5 and F-.