Method of manufacturing pure nickel hydroxide

Claim 1

A METHOD OF MANUFACTURING PURE NICKEL HYDROXIDE WHICH COMPRISES THE STEPS OF EFFECTING THE ANODIC CORROSION OF NICKEL MAT ANODES HAVING THE FOLLOWING CONTENTS BY WEIGHT: NICKEL 76% TO 83%, SULFUR 23% TO 16%, COBALT 0.30% TO 0.40%, IRON 0.04% TO 0.08%, COPPER 0.050% TO 0.065%, BY DIRECT ELECTROLYTIC ACTION IN ANODE COMPARTMENTS OF AN ELECTROLYSIS CELL DIVIDED INTO COMPARTMENTS WHICH CONTAINS AS AN ELECTROLYTE AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDES AND SULFATES OF SODIUM, POTASSIUM, MAGNESIUM AND CALCIUM, TO FORM AN ANOLYTE HAVING A HIGH-NICKEL SALT CONTENT SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDE AND SULFATE, IN AN ACID MEDIUM HAVING A PH VALUE RANGING FROM 2 TO 4, DIFFUSING THE ANOLYTE TOWARDS THE ANODE COMPARTMENTS OF THE ELECTROLYSIS CELL THROUGH FABRIC PARTITIONS SEPARATING THE ANODE COMPARTMENTS FROM THE CATHODE COMPARTMENTS, PRECIPITATING THE NICKEL IN THE CATHODE COMPARTMENTS IN THE FORM OF NICKEL HYDROXIDE, IN A BASIC MEDIUM HAVING A PH VALUE RANGING FROM 8 TO 10, CONTINUOUSLY EXTRACTING FROM THE ELECTROLYSIS CELL IN NICKEL HYDROXIDE SUSPENSION CONTAINED IN THE ELECTROLYTE, DECANTING SAID SUSPENSION IN A STATIC DECANTER FOR CONCENTRATING THE SUSPENSION FROM 4 TO 6 GRAMS OF NICKEL PER LITER TO 25 TO 30 GRAMS OF NICKEL PER LITER, AND A SERIES OF FILTRATIONS OF THE CONCENTRATED SUSPENSION IN CONJUNCTION WITH THE WASHING OF THE NICKEL HYDROXIDE WITH WATER AND REPULPING STIRRING, SAID SERIES COMPRISING THREE STAGES OF FILTERING AND WASHING WITH WATER ON THE FILTER, AND TWO INTERMEDIATE REPULPING STEPS.

Claim 2

A METHOD OF MANUFACTURING PURE NICKEL HYDROXIDE WHICH COMPRISES THE STEPS OF EFFECTING THE ANODIC CORROSION OF NICKEL MAT ANODES HAVING THE FOLLOWING CONTENTS BY WEIGHT: NICKEL 76% TO 83%, SULFUR 23% TO 16%, COBALT 0.30% TO 0.40%, IRON 0.04% TO 0.08%, COPPER 0.050% TO 0.065%, BY DIRECT ELECTROLYTIC ACTION IN ANODE COMPARTMENTS OF AN ELECTROLYSIS CELL DIVIDED INTO COMPARTMENTS WHICH CONTAINS AS AN ELECTROLYTE AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDES AND SULFATES OF SODIUM, POTASSIUM, MAGNESIUM AND CALCIUM, TO FORM AN ANOLYTE HAVING A HIGH-NICKEL SALT CONTENT SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDE AND SULFATE, IN AN ACID MEDIUM HAVING A PH VALUE RANGING FROM 2 TO 4, DIFFUSING THE ANOLYTE TOWARDS THE ANODE COMPARTMENTS OF THE ELECTROLYSIS CELL THROUGH FABRIC PARTITIONS SEPARATING THE ANODE COMPARTMENTS FROM THE CATHODE COMPARTMENTS, PRECIPITATING THE NICKEL IN THE CATHODE COMPARTMENTS IN THE FORM OF NICKEL HYDROXIDE, IN A BASIC MEDIUM HAVING A PH VALUE RANGING FROM 8 TO 10, CONTINUOUSLY EXTRACTING FROM THE ELECTROLYSIS CELL IN NICKEL HYDROXIDE SUSPENSION CONTAINED IN THE ELECTROLYTE, DECANTING SAID SUSPENSION IN A STATIC DECANTER FOR CONCENTRATING THE SUSPENSION FROM 4 TO 6 GRAMS OF NICKEL PER LITER TO 25 TO 30 GRAMS OF NICKEL PER LITER, AND A SERIES OF FILTRATIONS OF THE CONCENTRATED SUSPENSION IN CONJUNCTION WITH THE WASHING OF THE NICKEL HYDROXIDE WITH WATER AND REPULPING STIRRING, SAID SERIES COMPRISING THREE STAGES OF FILTERING AND WASHING WITH WATER ON THE FILTER, AND TWO INTERMEDIATE REPULPING STEPS.