COMPUTER-CONTROLLED PRECIPITATION OF METAL-HYDROXIDES AND HYDROUS OXIDES - PREPARATION OF MANGANESE-DIOXIDE HAVING UNIFORM PARTICLE SIZES

It is difficult to precipitate metal hydroxides and hydrous oxides that always have the same properties from aqueous solution. Recently, the authors were able to obtain cobalt, nickel, and manganese hydroxides, as well as their double hydroxides with aluminum, by computer-controlled precipitation at a constant pH value. Their compositions, structures, and discharge capacities could be well reproduced. The authors report here on the application of this technique to the Guyard reaction, the formation of manganese dioxide from manganese (II) salts and potassium permanganate in acidic solution.