1/19/2024 0 Comments Too casting copper cathodeThe furnaces are used for melting both the crude metals for the anodes, and the fine gold- and silver-products of the refinery that are to be cast into bars. A drawing of these furnaces is given in Fig. 100 graphite crucibles, in Rockwell melting-furnaces of the “ open-top mint type,” heated with crude oil. The endeavor is to make a mixture, such that the anodes will run about 600 thousandths in silver, 300 thousandths in gold, and the remaining 100 thousandths in base-metals. The Anodes are made up of crude silver-bullion, together with gold-bullion that is too low in gold to be easily made up into gold anodes. 1, which gives the order of events and the interdependence of the various operations in a brief form. Silver Refining How to Refine Silver with ElectrolysisĪn outline of the system is shown by the diagram, Fig. The methods here described are those in use, when notes for the present paper were taken. The small rooms are used as foreman’s office, laboratory, and generator-room, respectively. The large ones are, a melting-room, 30 by 34 ft. The refinery occupies three large and three small rooms. This residue is relatively small, and is melted into bars and stored until sufficient accumulates to warrant treating it for platinum, etc. These cells produce pure copper, and collect a residue containing lead, some gold and silver, and all the metals of the platinum group that were in the bullion. These are removed by scrap-iron, and are then treated in the copper-cells, having a sulphate electrolyte. The various waste solutions and the wash-waters, after being freed from the bulk of their precious metals, still contain copper and other metals. The latter is reduced to the metallic state with zinc and is then treated in the silver-cells. ![]() These produce fine gold and leave a residue containing silver chloride. The residue from the silver-cells, together with crude gold bullion, is treated in cells having a chloride electrolyte. These cells produce fine silver and leave a residue rich in gold. The refinery takes the bullion purchased by the receiving department, and carrying more than 200 parts of precious metals in 1,000, or, in mint parlance, over 200 fine, and separates and refines the various metals contained therein, using electrolytic processes exclusively.īullion containing silver is treated in cells charged with a nitric electrolyte.
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