173,028. Barker, J. T., and United Alkali Co., Ltd. Sept. 10, 1920. Chlorates, obtaining; electrodes; cells.-A cell particularly for use in the production of alkali chlorates is made of large superficial area for a given cubical capacity by increasing the height tor length or both at the expense of the width. The metal walls of the cell A are bare from a little below the normal level of the electrolyte B to a little above the bottom of the anodes E, other parts being protected by cement a, a2; the bare parts together with a cooling-coil F constitute the cathode. A temperature of 35 to 40‹ C. is maintained; little cooling-water is necessary in cold weather. Suitable internal dimensions for a cell to carry an average current of 1500 amperes are length 8 ft., height 4 ft., and width 15 inches, minimum dimensions for the same capacity being length 5ft., height 30 inches, and width 8 inches. For a 750-ampere cell the preferred dimensions are length 4 ft., height 44 inches, and width 15 inches and the minimum dimensions length and height both 30 inches and width 8 inches. The anodes E consist of cylindrical carbon rods impregnated for five or six inches down with paraffin wax or other material. They are supported by hard rubber pins e on a cover G of asbestos cement, and are provided at the bottom with glass or other distance pieces e2. The anodes are provided with screw terminals e3 connected by flexible copper wires with a conducting bar J carried by wooden blocks j2. A glass overflow tube t is fitted through a rubber stopper s in the side of the cell. The cover G is provided at each end with holes (not shown) to receive earthenware or other pipes. 'The ends f of the coil F are protected above the liquid by cement a' and are connected to the rim D of the cell by copper bars L. An oval or undercut iron bar c is bolted round the rim to retain the cement covering a. The cell may be made of cast iron or of steel plate, 3/16 to “ inch thick, with welded joints. Bichromates may be used to stimulate the production. Several cells may be worked in cascade with circulation of fresh liquor or returned mother-liquor.
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