BigPatents India

The invention relates to an improved process of making sodium zirconium phosphate powder. The process steps are: preparing a batch containing 7.55 to 9.45wt% of Na2 CO3, 35.0 to 40.0wt% of ZrO2 and 49.0 to 55.0 wt% of NH4H2PO4, mixing and grinding the batch for a period in the range of 6-8 hrs, heat treating the mixed batch at a temperature in the range of 1600-2000C for a period in the range of 12-18 hrs., regrinding the material in an organic solvent for a period in the range of 6-8 hrs., drying the reground material, heat treating the dried material at a temperature in the range of 500-6500C for a period in the range of 3 to 6 hrs., further raising the temperature in the range of 750 to 9500C for a period in the range of 12-18 hrs., grinding the heat treated material in an organic solvent medium for a period in the range of 6-8 hrs., drying the ground material, by know methods, sintering at a temperature in the range of 1300-14000C for 24 to 48 hrs., grinding and milling the fired shapes by known methods.