decompose the free soda, silicates of soda, and so on, which may have been formed during the roasting, and which woulHermes Kellyd cause a great loHermesss of metal. The vessels in which the lixiviation is performed, may be of wood or masonry work, and may be of any form and dimension, according to circumstances; they should be furnished with an ordinary filter to allow the water to run off freely. The precipitation and purification of the metals contained in the solution, or the formation of other commercial products, can be effected bHermes Birkiny the usual processes. TheHermes Handbags copper, however, may be precipitated also by common ashes, lime water, and caustic water, and the products obtained may be used in the manufacture of different colours, salts, and so on, or reduced to the metallic state in ordinary furnaces, or by other known processes. The copper may also be precipitated in the state of arsenite or arseniate of copper for the formation of Schieles or VBirkinienna green, by means of a solution of arsenite or arseniate of potash. The refuse wash waters which have served for the separation of the metals may be employed for moistening the roasted and pulverized ores, or for other purposes. After the Hermes bagslixiviation, there remains in the vessel theHermes outlet powdered metallic rock gold, oxides of iron, tin, zinc, and so on, if the ore contained such metals, which can be utilized by known means."
Other methods of treating ores containing copper, as well as those of Napier and Henderson, will be treated of hereafter. See Alloys. Arsenic. Atomic Weights. Chimney, p. 951. Furnaces. Gold. Iron. Kilns. Lead. Nickel. Ohes, Machinery and processes employed to
f sulphur contained in the ore employed, and depending, in some degree, on the nature of the substances associated with it. The less arsenic contained in the ore the better, although its presence is not an insurmountable objection, especially if associated with a small percentage of copper. A charge being drawn about every twenty-four hours from the front bed, each one of the three