Potassium Alum → Molecular sieve

Temperature

55 °C

Sodium aluminosilicate was prepared as follows. Approximately 5990 L of sulfate water (4% concentration) were added to a 36,000-L reactor. While mixing, the reactor contents were heated to 55° C., and 119.8 L of sodium silicate were added to the reactor and mixed. A 25-min simultaneous addition step with alum and silicate solution followed, using a sodium silicate addition rate of 398.8 L/min and an alum addition rate of 145.1 L/min. After the simultaneous addition step, a reduced alum flow rate was used to bring the batch pH to about 5.3. After digesting the batch for 10 min, the product slurry was washed and filtered using a press filter. The collected filtered cake was reslurried and zirconium oxysulfate powder was manually added. The zirconium treated cake slurry was then fed into a vertical bead mill. The bead-milled Zr-treated cake slurry was then spray dried and hammer milled to an average 3-5 micron particle size. Two batches were run, one resulting in a final amount of 0.3 wt. % Zr (Example 25), and the other resulting in a final amount of 0.45 wt. % Zr (Example 26), based on the Zr-treated sodium aluminosilicate weight.

1. additionWhile mixing
2. additionmixed
3. additionAfter the simultaneous addition step
4. customfor 10 min
5. washthe product slurry was washed
6. filtrationfiltered
7. filtrationfilter
8. filtrationThe collected filtered cake
9. additionzirconium oxysulfate powder was manually added
10. additionThe bead-milled Zr-treated cake slurry
11. customwas then spray dried
12. customhammer milled to an average 3-5 micron particle size

ORD record

ord-4a6f1486685a4a2380e4366cd3174060

Source dataset

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09388299B2