Impurities removal from waste solids in the production of soda ash, sodium bicarbonate and/or other derivatives
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United States of America Patent
Stats
-
Jul 8, 2014
Grant Date -
Nov 10, 2011
app pub date -
May 3, 2011
filing date -
May 4, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for removing impurities from a waste solid to provide at least a portion of a suitable crystallizer feed to a process for making crystalline sodium carbonate, bicarbonate, and/or other derivatives. The method comprises: contacting the waste solid with a leach solution to dissolve at least one impurity and dissolving the resulting leached residue. Leaching may include heap percolation. The leach solution may comprise a crystallizer purge liquor, a process waste effluent, a mine water, or mixtures thereof. The method may further comprise adding a magnesium compound to the resulting leached residue during or after its dissolution to remove another impurity. The waste solid preferably comprises a pond solid containing such impurities. The pond solid may be recovered from a pond receiving crystallizer purge liquor(s) and/or other process waste effluent(s). The pond solid may contain sodium carbonate, any hydrate thereof, sodium bicarbonate, and/or sodium sesquicarbonate. The impurities to be removed may comprise sodium chloride, sodium sulfate, silicates, and/or organics.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2011 Application Filing Year
- C01D Class
- 88 Applications Filed
- 71 Patents Issued To-Date
- 80.69 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 5 Citation Count
- C01D Class
- 11.63 % this patent is cited more than
- 11 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 8, 2026 |
