摘要
采用磷铵尿素法制备聚磷酸铵过程中,尿素分解产生大量的二氧化碳和氨气,从而导致反应过程中大量发泡,易造成溢料等现象,导致物料损失等不利后果.尝试添加氧化镁、硫酸镁、硫酸钾和七水合硫酸亚铁等金属盐到料浆中参与反应,发现在料浆中复配适量的氧化镁、硫酸镁、硫酸钾以及七水合硫酸亚铁可以改善聚磷酸铵的发泡现象,且复配氧化镁和硫酸镁消泡效果最为明显.同时制备的聚磷酸铵的水不溶物含量、pH、聚合率、有效磷含量、总氮含量和总养分含量均满足HG/T 5939-2021标准要求.
Abstract
During the preparation of ammonium polyphosphate by ammonium phosphate and urea method,the decomposition of urea produces a large amount of carbon dioxide and ammonia gas,leading to a large amount of foaming during the reaction process,easily causing overflow and other adverse consequences such as material loss.Metal salts such as magnesium oxide,magnesium sulfate,potassium sulfate and ferrous sulfate heptahydrate are added to the slurry to participate in the reaction.The results show that adding an appropriate amount of magnesium oxide,magnesium sulfate,potassium sulfate and ferrous sulfate heptahydrate to the slurry can improve the foaming phenomenon of ammonium polyphosphate,and the antifoaming effect of magnesium oxide and magnesium sulfate is the most significant.The water insoluble matter content,pH,polymerization rate,effective phosphorus content,total nitrogen content and total nutrient content of the prepared ammonium polyphosphate simultaneously meet the requirements of HG/T 5939-2021 standard.
基金项目
贵州省科技支撑计划(黔科合支撑[2021]一般300)
NETL
NSTL
万方数据