Study on Manufacturing of N-P-Mg Compound Fertilizer from Phosphate Tailings with High Magnesium Content
The continuous digestion technological conditions of phosphate tailings with high magnesium content in sulfuric and phosphoric mixed acid is studied in this paper.The influences of excess coefficient of sulfuric acid,weight liquid to solid,reaction temperature and time on conversion of P2O5 and MgO are discussed.The influence of infiltration capacity of phosphogypsum by the concentration of liquid-phase SO3 is discussed too.Under the optimal technological conditions,the conversion of P2O5 is 95.56% and MgO 98.63%,the filtration rate of phosphogypsum increases with the increasing of liquid-phase concentration of SO3,the optimal apparent concentration of SO3 is 0.135～0.14g·mL-1 in liquid-phase.The filtration rate of phosphogypsum is 1473kg· m-2· h-1.N-P-Mg compound fertilizer was produced by adding magnesia powder and inflating ammonia in filtering medium.
N-P-Mg compound fertilizer Phosphate tailing High magnesium content
Z.D.Tan J.C.Gu Y.X.Zhang
School of Energy and Enviornment,Xihua University,Chengdu,China School of Chemistry and Enviommental School of Energy and Enviomment,Xihua University,Chengdu,China School of Chemical Engineering,Sichnan University,Chengdu,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3725-3730
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）