Study On The Rheological Behavior Of Acidic Ammoniated Slurry

"Slurry-concentrated method" to product ammonium phosphate can't utilize the concentration heat effectually. At the same time the viscosity of slurry is very high. The concentration of water can't drop to 20%, the drying process consumes lots of energy. Work intensity of drying equipment is too low. To solve these questions, this paper bring out a new technique, "acidic slurry-concentrated method ", and study the rheological behavior of the acidic slurry.In this paper, firstly the rheological character of acidic ammonium phosphate slurry was studied. The result showed the relations between the value of neutralization and the viscosity of slurry. When the value of neutralization was 0.52, the viscosity of slurry is the lowest. With the decreasing of the concentration of water, the viscosity increased, the flow showed shear thinning, the non-Newtonian characters appearing. In addition, the exponential relationship between viscosity and the temperature is observed.Secondly influences of the additives were investigated. After adding the additives into the slurry, the fluidity of the slurry changed. Some additives such as polyglycol can make the viscosity of slurry descend.Thirdly the effect of impurities in the simulating wet-process phosphoric acid on the rheological behavior of the acidic ammoniated slurry has been studied. The result showed the viscosity has very important relations with the impurity and confirmed the impurities in the wet -process phosphate slurry could affect the fluidity of the acidic slurry, especially "Mg2+". After theregression analysis of the data, several mathematical models expressing the effects of the impurities on the rheological behavior were obtained .