Abstract: An electrochemical process for producing manganese dioxide by electrolysis of a solution of manganese sulphate containing 100 to 150 g/l of manganese sulphate and 20 to 30 g/l of sulphuric acid and having a temperature of from 90.degree. to 95.degree. C at an anodic current density of from 80 to 100 A/m.sup.2 using a titanium anode coated with a layer of titanium carbide with a thickness of from 50 to 100 mcm and a cathode. The resulting manganese dioxide is useful in the production of electric cells as the active mass of the positive electrode fo manganeze-zinc chemical sources of current.

Abstract: Disclosure is made of an electrochemical process for producing manganese dioxide by electrolyzing a solution containing 100 to 200 g/l of manganese sulphate and 20 to 100 g/l of sulphuric acid. The temperature of the solution is 90.degree. to 98.degree. C, and the anode current density is 100 to 300 A/m.sup.2. The anode is of titanium. On the surface of the anode there are provided uniformly spaced hollows whose total surface area is not less than 10 percent of that of the anode. Inside said hollows there is provided a coating consisting of two layers. The first layer is 0.8 to 5 mu thick and is of a metal selected from the platinum family; it may be of ruthenium dioxide or platinum oxide. It also may be of lead dioxide, in which case this first layer is 0.1 to 1 mm thick. The second layer has a thickness of 1 to 2 mm and is of manganese dioxide.