Phosphoric Acid → Zirconium phosphate

Participants

Reaction Conditions

Reaction Steps

Amorphous zirconium phosphate was prepared in all the examples. In this example the material was prepared according to the following procedure. In the first stage, a slurry containing 440 g of basic zirconium sulfate (40% ZrO2) (MEI, HCP PP142A), with a predetermined particle size distribution ranging from 50 to 60 microns, in a phosphorus-containing solution was made. The phosphorus-containing solution had the following composition: 3.3 kg of water, 402 g of 75 wt % H3PO4, 380 g of 30 wt % NaOH and 45 g of Na4SiO4. The slurry was transferred into an autoclave, sealed and heated at 160° C. for 3 hours under constant stirring. The resulting product of conversion was filtered, washed with 0.5 kg of water and re-slurried in 2 L of 1 M H2SO4. The zirconium phosphate slurry in sulfuric acid was heated to the boiling point and kept at this temperature for 1 hour. After cooling down, the zirconium phosphate was filtered, washed with 0.5 kg of water and re-slurried in 1 L of water. To the ZrP suspension a 30 wt % NaOH solution was added gradually for 30 to 40 minutes to raise the pH to 7.0. Then, the zirconium phosphate was filtered, washed with 1 kg of water and dried at 150° C. for 12 hours in air.

Provenance & Evidence