Production of pure cobaltic hydroxide
First Claim
3. THE PROCESS FOR PRODUCING COBALTIC HYDROXIDE SUBSTANTIALLY DEVOID OF NICKEL AND COBALT WHICH COMPRISES, IN COMBINATION, THE STEPS OF REFRIGERATING TO A TEMPERATURE OF ABOUT 0* C. TO 12* C. AN IMPURE COBALT SOLUTION CONTAINING NICKEL AS AN IMPURITY BUT CONTAINING NO IRON IN AMOUNTS GREATER THAN ABOUT 0.01 GRAMS PER LITER, PRECIPITATING IMPURE NICKEL-CONTAINING COBALTIC HYDROXIDE FROM THE THUS-REFRIGERATED SOLUTION AT A PH BETWEEN ABOUT 1 AND ABOUT 2.4 BY ADDING TO SAID SOLUTION A SUBSTANTIALLY IRON- AND COBALT-FREE NICKELIC HYDROXIDE PRECIPITANT ITSELF PREPARED BY PRECIPITATION AT A TEMPERATURE OF ABOUT 0* C. TO 8* C., AND THEREAFTER PURIFYING SAID IMPURE NICKEL-CONTAINING COBALTIC HYDROXIDE PRECIPITATE AT A TEMPERATURE OF AT LEAST ABOUT 70* C. BY DIGESTING SAID PRECIPITATE WITH A SUBSTANTIALLY NICKEL-FREE AQUEOUS SOLUTION CONTAINING DISSOLVED COBALT AND HAVING A PH OF ABOUT 1.5 TO 2 TO REMOVE NICKEL CONTAINED IN SAID IMPURE COBALTIC HYDROXIDE AND TO PROVIDE A PURIFIED COBALTIC HYDROXIDE IN WHICH THE RATIO OF COBALT TO NICKEL IS AT LEAST ABOUT 200 TO 1.
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3 Claims
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3. THE PROCESS FOR PRODUCING COBALTIC HYDROXIDE SUBSTANTIALLY DEVOID OF NICKEL AND COBALT WHICH COMPRISES, IN COMBINATION, THE STEPS OF REFRIGERATING TO A TEMPERATURE OF ABOUT 0* C. TO 12* C. AN IMPURE COBALT SOLUTION CONTAINING NICKEL AS AN IMPURITY BUT CONTAINING NO IRON IN AMOUNTS GREATER THAN ABOUT 0.01 GRAMS PER LITER, PRECIPITATING IMPURE NICKEL-CONTAINING COBALTIC HYDROXIDE FROM THE THUS-REFRIGERATED SOLUTION AT A PH BETWEEN ABOUT 1 AND ABOUT 2.4 BY ADDING TO SAID SOLUTION A SUBSTANTIALLY IRON- AND COBALT-FREE NICKELIC HYDROXIDE PRECIPITANT ITSELF PREPARED BY PRECIPITATION AT A TEMPERATURE OF ABOUT 0* C. TO 8* C., AND THEREAFTER PURIFYING SAID IMPURE NICKEL-CONTAINING COBALTIC HYDROXIDE PRECIPITATE AT A TEMPERATURE OF AT LEAST ABOUT 70* C. BY DIGESTING SAID PRECIPITATE WITH A SUBSTANTIALLY NICKEL-FREE AQUEOUS SOLUTION CONTAINING DISSOLVED COBALT AND HAVING A PH OF ABOUT 1.5 TO 2 TO REMOVE NICKEL CONTAINED IN SAID IMPURE COBALTIC HYDROXIDE AND TO PROVIDE A PURIFIED COBALTIC HYDROXIDE IN WHICH THE RATIO OF COBALT TO NICKEL IS AT LEAST ABOUT 200 TO 1.
Specification
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Current AssigneeEdward Wallis Albert, John Pincott
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Original AssigneeEdward Wallis Albert, John Pincott
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InventorsEDWARD WALLIS ALBERT, JOHN PINCOTT
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Application NumberUS03/354,655Time in Patent Office938 DaysField of SearchUS Class Current423/140CPC Class CodesC01G 51/04 Oxides; Hydroxides
