Abstract 1. A PROCESS FOR MELT REFINING SODIUM CHLORIDE TO PROVIDE A HIGH PURITY SALT PRODUCT WHICH IS SUBSTANTIALLY FREE OF CALCIUM, MAGNESIUM, AND SULFATE IMPURITIES, COMPRISING CARRYING OUT IN COMBINATION THE STEPS OF (A) HEATING THE SODIUM CHLORIDE ABOVE ITS MELTING TEMPERATURE TO PROVIDE A SALT MELT, (B) INTRODUCING INTO SAID MELT A SUFFICIENT QUANTITY OF AN ALKALI PRECIPITATION AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI HYDROXIDES, CARBONATES, SILICATES AND PHOSPHARES, TO PRECIPITATE CALCIUM AND MAGNESIUM NESIUM IMPURITIES IN SAID MELT, (C) REMOVING PRECIPITATED CALCIUM AND MAGNESIUM IMPURITIES FROM SAID MELT, (D) CONTACTING SAID MELT WITH ELEMENTAL CARBON TO REMOVE SULFATE IMPURITY FROM SAID MELT, (E) MAINTAINING SAID SALT MELT IN CONTACT WITH SAID CARBON FOR A PREDETERMINED TIME OF EFFECT THE DESIRED LEVEL OF SULFATE REMOVAL, (F) REMOVING ANY REMAINING CARBON FROM THE SALT MELT AFTER TH DESIRED LEVEL OF SULFATE REMOVAL HAS BEEN OBTAINED, AND (G) SUBSEQUENTLY COOLING AND SOLIDIFYING THE SALT MELT TO PROVIDE A HIGH PURITY, SOLID SALT PRODUCT.
A PROCESS FOR MELT REFINING SODIUM CHLORIDE TO PROVIDE A HIGH PURITY SALT PRODUCT WHICH IS SUBSTANTIALLY FREE OF CALCIUM, MAGNESIUM, AND SULFATE IMPURITIES, COMPRISING CARRYING OUT IN COMBINATION THE STEPS OF (A) HEATING THE SODIUM CHLORIDE ABOVE ITS MELTING TEMPERATURE TO PROVIDE A SALT MELT, (B) INTRODUCING INTO SAID MELT A SUFFICIENT QUANTITY OF AN ALKALI PRECIPITATION AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI HYDROXIDES, CARBONATES, SILICATES AND PHOSPHARES, TO PRECIPITATE CALCIUM AND MAGNESIUM NESIUM IMPURITIES IN SAID MELT, (C) REMOVING PRECIPITATED CALCIUM AND MAGNESIUM IMPURITIES FROM SAID MELT, (D) CONTACTING SAID MELT WITH ELEMENTAL CARBON TO REMOVE SULFATE IMPURITY FROM SAID MELT, (E) MAINTAINING SAID SALT MELT IN CONTACT WITH SAID CARBON FOR A PREDETERMINED TIME OF EFFECT THE DESIRED LEVEL OF SULFATE REMOVAL, (F) REMOVING ANY REMAINING CARBON FROM THE SALT MELT AFTER TH DESIRED LEVEL OF SULFATE REMOVAL HAS BEEN OBTAINED, AND (G) SUBSEQUENTLY COOLING AND SOLIDIFYING THE SALT MELT TO PROVIDE A HIGH PURITY, SOLID SALT PRODUCT.
Claim 2
Dependent Claim
163 words
A PROCESS FOR MELT REFINING SODIUM CHLORIDE TO PROVIDE A HIGH PURITY SALT PRODUCT WHICH IS SUBSTANTIALLY FREE OF CALCIUM, MAGNESIUM, AND SULFATE IMPURITIES, COMPRISING CARRYING OUT IN COMBINATION THE STEPS OF (A) HEATING THE SODIUM CHLORIDE ABOVE ITS MELTING TEMPERATURE TO PROVIDE A SALT MELT, (B) INTRODUCING INTO SAID MELT A SUFFICIENT QUANTITY OF AN ALKALI PRECIPITATION AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI HYDROXIDES, CARBONATES, SILICATES AND PHOSPHARES, TO PRECIPITATE CALCIUM AND MAGNESIUM NESIUM IMPURITIES IN SAID MELT, (C) REMOVING PRECIPITATED CALCIUM AND MAGNESIUM IMPURITIES FROM SAID MELT, (D) CONTACTING SAID MELT WITH ELEMENTAL CARBON TO REMOVE SULFATE IMPURITY FROM SAID MELT, (E) MAINTAINING SAID SALT MELT IN CONTACT WITH SAID CARBON FOR A PREDETERMINED TIME OF EFFECT THE DESIRED LEVEL OF SULFATE REMOVAL, (F) REMOVING ANY REMAINING CARBON FROM THE SALT MELT AFTER TH DESIRED LEVEL OF SULFATE REMOVAL HAS BEEN OBTAINED, AND (G) SUBSEQUENTLY COOLING AND SOLIDIFYING THE SALT MELT TO PROVIDE A HIGH PURITY, SOLID SALT PRODUCT.