The Hunt and Douglas Process for Extracting Copper From Its Ores: With an Appendix Including Notes on the Treatment of Silver and Gold Ores, and a Plate (Classic Reprint) - Tapa blanda

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Excerpt from The Hunt and Douglas Process for Extracting Copper From Its Ores: With an Appendix Including Notes on the Treatment of Silver and Gold Ores, and a Plate

This is what is technically called a wet method, because the copper is removed from its ores in a dissolved state, the solvent employed in the present process being a watery solution of neutral protochlorid of ironand common salt. Most oxydized compounds of copper - whether obtained artificially by roasting sulphuretted ores, or found in nature in the forms of carbonates and oxyds, - when digested with such a solution are converted into a mixture of protochlorid and dichlorid of copper, which are dissolved, while the iron of the solvent separates in the form of insoluble hydrous peroxyd of iron. When the solution of the chlorids of copper thus obtained is brought in contact with metallic iron the copper is separated in a metallic crystalline state, while the iron passes into solution, reproducing the protochlorid of iron; thus restoring its solvent powers to the liquid, wrhich we shall call "the bath," and fitting it for the treatment of a fresh portion of copper ore. This process of solution and precipitation can, under proper conditions, be repeated in efinitely with the same bath, the only reagent consumed being the metallic iron.

The chief advantage which wet processes possess over smelting lies in the economy of fuel.

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