L'hydrométallurgie du cuivre . s de tous les niveaux. La ferraille est utilisée dans une faible mesure, butthe résultats sont beaucoup moins satisfaisants que les bidons, principallybecause avec de la plus grande surface exposée par les bidons. Le précipité jaune épais isa matière contenant en plus de cuivre, le replacediron, quelques petits fragments de silice non consommées, can, etc. en zones hautes l'assainissement des entreprises sont effectués tous les deux jours, mais lessfrequently dans les niveaux inférieurs, en raison de la plus petite quantité de précipitation de cuivre Le cuivre des eaux de mine 413 a précipité. Tout en collectant le cuivre le flux de w

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The hydrometallurgy of copper . s of all the tiers. Scrap iron is used to a small extent, butthe results are much less satisfactory than with the cans, principallybecause of the greater surface exposed by the cans. The precipitate isa thick yellow material containing in addition to copper, the replacediron, some little silica, unconsumed fragments of can, etc. In the upper tiers the clean-ups are made every second day, but lessfrequently in the lower tiers, owing to the smaller amount of copper PRECIPITATION OF COPPER FROM MINE WATERS 413 precipitated. While collecting the copper the flow of water is shut offfrom one trough at a time. This trough is then drained and the canswashed thoroughly with water from a hose under pressure. The water, containing the copper product, is run into settling tanks where in about2 hours the metal settles sufficiently so that the water can be siphonedoff. After these clean-ups, occurring every other day, more cans areadded as required. Once a month each trough is emptied and a thorough. Fig. 70.—Copper Queen precipitating plant. Exterior view. clean-up made. The troughs are then refilled with a new supply of cans. The clean-up settling tanks, of which there are four placed in theinterior of the rectangle, are 25X40x2 ft. deep. Once a month thesetanks are cleaned out; the wet mud is bailed up in buckets, emptied intoa car and dumped into a drying tank, where it remains for about 1month before being shoveled up and loaded into the railroad cars, tobe taken to the smelter at Douglas. There are two of these dryingtanks 18X25X2 ft. deep. The cans which are collected in Bisbee are contracted for at a nominalprice per ton. Mexican labor is used entirely, the amount requiredbeing very small, as only two men are working steadily. For cleaningout the settling tanks, three extra men are required 4 or 5 days a month.The precipitate handled by these three men is loaded, when dry, by fiveothers into a railroad car, holding 45 tons, in 1 day. The p

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