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| Number | Title | Issue Date |
| 6270555 | Process for treating precious metal ores This invention provides a method to control the off gas emission of sulfur dioxide from a mineral ore roaster by grinding a sulfur-containing mineral ore, adding sodium sesquicarbonate to the mineral ore, and roasting the ore and sodium sesquicarbonate at... | 08/07/2001 |
| 5989505 | Method for recovery of alkali values from trona using air stripping A process for recovery of alkali values from trona in which trona is dissolved, the sodium carbonate in the feed solution is converted to sodium bicarbonate by introducing carbon dioxide, sodium bicarbonate is crystallized and separated from a mother liqu... | 11/23/1999 |
| 5976485 | Sodium metabisulfite process Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide present with a pH between 3.5 and 4.2. The solution is drawn to a cooling crystallizer where an alka... | 11/02/1999 |
| 5882476 | Deinking printed wastepaper using alkaline solution containing sodium sulfite and sodium carbonate This invention is a method for deinking wastepaper by disintegrating the waste paper in an carbonate aqueous solution containing sodium sulfite and sodium carbonate to produce a fibrous slurry having a pH of at least 7.5, separating the ink from the fiber... | 03/16/1999 |
| 5759507 | Process for production of dense soda ash from soda ash fines This invention provides a method for the production of dense soda ash by reacting sodium carbonate decahydrate with a light soda ash or soda ash fines at an elevated temperature to produce sodium carbonate monohydrate crystals, and drying the sodium carbo... | 06/02/1998 |
| 5753200 | Sodium metabisulfite process Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide present with a pH between 3.5 and 4.2. The solution is drawn to a cooling crystallizer where sodium ... | 05/19/1998 |
| 5624647 | Method for recovery of alkali values from trona using two-stage leaching A process for recovering alkali values from trona ore by partially dissolving trona in a first dissolving solution to form a first feed liquor and undissolved trona. The first feed liquor is cooled and sodium carbonate decahydrate is precipitated. The sod... | 04/29/1997 |
| 5618504 | Method for recovery of alkali values from trona using sequential crystallization A process for recovery of alkali values from trona ore comprising (a) dissolving the trona ore, (b) separating the insoluble material to obtain an alkali containing feed liquor, (c) cooling the feed liquor and crystallizing sodium bicarbonate and separati... | 04/08/1997 |
| 5575922 | Method for treating mine water using caustic soda A method for treating mine water from an underground trona ore mine comprising pumping the mine water from the mine, introducing caustic soda into the mine water, maintaining the pH of the treated mine water to between about 11.5 and about 14, separating ... | 11/19/1996 |
