Process for preparing mixed carbonates which may comprise hydroxide(s)

Abstract

A process for batchwise preparation of carbonates of at least two transition metals which may comprise hydroxide(s) of the corresponding transition metals, which comprises combining at least one aqueous solution comprising at least two transition metal salts having cations of at least two different transition metals overall with at least one solution of at least one carbonate or hydrogencarbonate of at least one alkali metal or ammonium, introducing a stirrer power of at least 0.25 W/l, and keeping the reaction volume essentially constant during the admixing with alkali metal (hydrogen)carbonate by removing liquid phase while adding solution of alkali metal (hydrogen)carbonate or alkali metal hydroxide.

1 . A process for batchwise preparation of carbonates of at least two transition metals which may comprise hydroxide(s) of the corresponding transition metals, which comprises combining at least one aqueous solution comprising at least two transition metal salts having cations of at least two different transition metals overall with at least one solution of at least one carbonate or hydrogencarbonate of at least one alkali metal or ammonium,
 introducing a stirrer power of at least 0.25 W/l,   and keeping the reaction volume essentially constant during the admixing with alkali metal (hydrogen)carbonate by removing liquid phase while adding solution of alkali metal (hydrogen)carbonate or alkali metal hydroxide.   
     
     
         2 . The process according to  claim 1 , which is performed in the presence of at least one complexing agent other than water. 
     
     
         3 . The process according to  claim 1  or  2 , which is performed for at least some of the time at a solids concentration of at least 500 g/l. 
     
     
         4 . The process according to any of  claims 1  to  3 , wherein the reactor system selected is a reaction vessel having at least one apparatus by which solid/liquid separations can be conducted. 
     
     
         5 . The process according to  claim 4 , wherein the apparatus by which solid/liquid separations can be conducted is selected from sedimenters, lamellar clarifiers, centrifuges and units for inverse filtrations. 
     
     
         6 . The process according to any of  claims 1  to  5 , wherein the reactor system selected is a tank having a pumped circulation system. 
     
     
         7 . The process according to any of  claims 1  to  6 , wherein the actual precipitation is performed at a reaction temperature in the range from 40 to 80° C. 
     
     
         8 . The process according to any of  claims 1  to  7 , wherein aqueous solution comprising at least three transition metal salts having cations of at least three different transition metals is used. 
     
     
         9 . The process according to any of  claims 1  to  8 , wherein aqueous solution of salts of nickel, cobalt and manganese is used. 
     
     
         10 . The process according to any of  claims 1  to  9 , wherein seed crystals or crystallization nuclei are added at the start of the reaction. 
     
     
         11 . The process according to any of  claims 1  to  10 , wherein carbonates of at least two transition metals which may comprise hydroxide(s) of the corresponding transition metals comprise 0.01 to 45 mol % of anions other than carbonate ions, based on the total number anions in the transition metal carbonate in question.