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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...Then some sulphuric acid is added to remove the basic iron. This acid solution is allowed to pass through the cement copper, after which the latter is well washed. By this method I obtained cement copper containing 90 to 95 per cent. copper. If the cement copper has to be prepared from blue vitriol it may be desirable to use it for a longer time, in which case it will become much richer in silver, but it has to be taken out occasionally and treated with dilute sulphuric acid to remove the basic salts. Thus purified the cement copper acts again with energy. In order not to interfere with the regular work, the tanks have to be so arranged that during cleaning half of them remain in operation while the others are disconnected and cleaned. As soon as half are cleaned, the scrap iron or cement copper is put in place and the solution allowed to enter again while the other tanks are cleaned. Precipitating the Dissolved Silver Chloride by Dilution with Water.--This method was first recommended and introduced by me. All alkaline and metal chlorides have the property, when concentrated, of dissolving silver chloride, and dropping it again as such when diluted with water. The precipitation takes place in proportion to the dilution, and if sufficient water be added all the silver will be precipitated. This method of desilverizing the base-metal solution is undoubtedly the most effective and cheapest, all that is required being a sufficient supply of water and a few more vats for base-metal precipitation than are usually found in lixiviation works. I used this method first at the Silver King mill in Arizona in 1880 to 1882 with very good results, then in various other localities where the supply of water permitted it, and also at the mill of the Hidalgo Mining Company, ...
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