. The cyanide process; an introduction to the cyanide process, including the determination of the applicability of the process to an ore. be carried to a higher court for final decision. McArthur-Forrest Process.—This process consists inapplying dilute solutions of potassium cyanide to ore(not exceeding 8 parts of cyanogen to 1000 parts ofwater), and precipitating the gold from the solution bymeans of zinc shavings. The zinc shavings are cutby a turning-tool from a series of zinc disks held betweenlathe-centers and turned. The patent also covers theuse of an alkali or alkaline earth to neutral
. The cyanide process; an introduction to the cyanide process, including the determination of the applicability of the process to an ore. be carried to a higher court for final decision. McArthur-Forrest Process.—This process consists inapplying dilute solutions of potassium cyanide to ore(not exceeding 8 parts of cyanogen to 1000 parts ofwater), and precipitating the gold from the solution bymeans of zinc shavings. The zinc shavings are cutby a turning-tool from a series of zinc disks held betweenlathe-centers and turned. The patent also covers theuse of an alkali or alkaline earth to neutralize theacidity of the ore. Siemens-Halske Process.—By this process the gold isprecipitated from the solution by electricity. Theanodes are iron plates, 7x3xi in. thick, covered withcanvas to prevent short circuits. The cathodes are 52 SHORT DESCRIPTIONS OF SOME PROCESSES. 53 very thin lead sheets, stretched between two iron wires,and fastened (3 in each) in light wooden frames, 2x3 ft.,which are suspended between the iron plates. Theiron anodes cause the formation of Prussian blue bythe reaction of ferrocyanide with iron Fig. 11.—Hampton (Patent) Zino Lathe. Sometimes the space between the iron plates is filledwith lead shavings, which take the place of the leadsheets, and offer a larger surface. 54 THE CYANIDE PROCESS. By this method of precipitation very weak solutions ofpotassium cyanide can be used to leach the ore. Byemploying very weak solutions of potassium cyanide,less cyanide is lost by cyanicides, and in the solu-tion that always remains in the ore; but it requires alonger contact of the solution with the ore. The Pneumatic Cyanide Process.—After the cyanidesolution has been put on the ore, compressed air isturned into the space beneath the false bottom in thevat, and is evenly distributed by means of a coil ofperforated pipes. The air forces its way through everyhole in the perforated false bottom, keeps the oreagitated, and supplies the oxygen for th
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