Production of manganese hydroxide

Claim 1

A PROCESS FOR RECOVERING MANGANESE AS HYDROXIDE FROM ACID AQUEOUS LIQUOR CONTAINING IN SOLUTION MANGANOUS SALT, COMPRISING THE STEPS OF ADDING TO SAID LIQUOR A HYDROXIDE SELECTED FROM THE GROUP CONSISTS OF ALKALI METAL HYDROXIDES AND ALKALINE EARTH METAL HYDROXIDE, SAID HYDROXIDE BEING ADDED TO SAID LIQUOR IN SUCH RESTRICTED QUANTITY THAT THE PH OF THE LIQUOR IS RAISED TO A VALUE BETWEEN 8.0 AND 8.5, SEPARATING ANY IMPURITIES PRECIPITATED AT THAT VALUE, ADDING TO THE RESULTING LIQUOR, IN PRESENCE OF AMMONIUM SALT, A HYDROXIDE WHICH ONLY FORMS SOLUBLE SALTS WITH ANY ACID RADICALS PRESENT IN THE LIQUOR AND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL HYDROXIDES, IN SUCH RESTRICTED QUANTITY THAT THE PH VALUE IS INCREASED TO A VALUE NOT GREATER THAN 9 WHEREBY TO CAUSE MANGANESE HYDROXIDE TO BE PRECIPITATED WITHOUT SUBSTANTIAL CO-PRECIPITATION OF ANY COMPOUND OF ANY METAL OTHER THAN MANGANESE PRESENT IN SOLUTION, AND SEPARATING SAID PRECIPITATED MANGANESE HYDROXIDE.