Electrochemical and metallurgical industry . lectrolytic antimony will be subsequently ob-tained. The resulting insoluble portion, after filtration of the anti-mony on a cloth filter, can be dried and mixed with one-fourth to one-third of its weight of soda ash; that is, 7 to10 pounds per ton of lead, and melted down to dore bullion,containing the bismuth of the slime. This is parted electro-lytically, as described later in this article. For copper slimes containing sulphur and little antimonyit is preferable to extract the sulphur, antimony, seleniumand tellurium by caustic soda solution, whi
Electrochemical and metallurgical industry . lectrolytic antimony will be subsequently ob-tained. The resulting insoluble portion, after filtration of the anti-mony on a cloth filter, can be dried and mixed with one-fourth to one-third of its weight of soda ash; that is, 7 to10 pounds per ton of lead, and melted down to dore bullion,containing the bismuth of the slime. This is parted electro-lytically, as described later in this article. For copper slimes containing sulphur and little antimonyit is preferable to extract the sulphur, antimony, seleniumand tellurium by caustic soda solution, which reacts withthe sulphur to form sodium sulphide, dissolving antimonyas sulphantimonite. Other methods of oxidation of the ferric sulphate weretried, as it was feared at first that the electrolysis of thecopper iron sulphates for copper and ferric sulphate couldnot be practically carried out. For example, allowing thesolution to trickle down cloths in the presence of air, crystal-lization of ferrous sulphate and calcination to basic ferric. FIG. 2.—\KT FOR DEPOSITING COPPER .\ND REGENERATING FERRICSULPHATE. sulphate and resolution of the same were found to be far in-ferior to electrolysis. Electrolytic Recovery of Copper and Ferric Sulphate. After preliminary experiments a tank was constructed asshown in Fig. 2. The tank is intended to be lined with lead,but this was omitted in this tank, owing to the experimentalnature of the work. The diaphragms are of cypress, five-eighthinch thick, perforated with five-eighth inch holes as closely aspossible. The holes are closed with asbestos wads, put inwet, which do not drop out. The boards should be wettedbefore the asbestos wads are put in, otherwise the unequalexpansion will split them. Arc-light carbons were used foranodes. One of the side channels in the tank contains theanolyte and the other the catholyte. Circulation is kept upby wooden paddle wheels, the solution flowing through theupper holes into the several compartments
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