Archive image from page 528 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 BOOK XI. JIFFERENT methods of parting gold from silver, ;ind, on the other hand, silver from gold, were dis- cussed in the last book; also the separation of copper from the latter, and further, of lead from gold as well as from silver; and, lastly, the methods for reiining the two precious metals. Now I will speak (if the methods by which silver must be separated from copper, and likewise from iron. The officina, or the building necessary for the purposes and use of those who separate silver
Archive image from page 528 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 BOOK XI. JIFFERENT methods of parting gold from silver, ;ind, on the other hand, silver from gold, were dis- cussed in the last book; also the separation of copper from the latter, and further, of lead from gold as well as from silver; and, lastly, the methods for reiining the two precious metals. Now I will speak (if the methods by which silver must be separated from copper, and likewise from iron. The officina, or the building necessary for the purposes and use of those who separate silver from copper, is constructed in this manner. First, four long walls are built, of which the first, which is parallel with the bank of a stream, and the second, are both two hundred and sixty-four feet long. The second, however, stops at one hundred and fifty-one feet, and after, as it were, a break for a length of twenty-four feet, it continues again until it is of a length equal to the first wall. The third wall is one hundred and twenty feet long, starting at a point opposite the sixty-seventh foot of the other walls, and reaching to their one hundred and eighty-sixth foot. The whole of this Book is devoted to the subject of the separation of silver from copper by liquation, except pages 530-9 on copper refining, and page 544 on the separation of silver from iron. We believe a brief outline of the liquation process here will refresh the mind of the reader, and enable him to peruse the Book with more satisfaction. The fundamental principle of the process is that if a copper-lead alloy, containing a large excess of lead, be heated in a reducing atmosphere, above the melting point of lead but below that of copper, the lead will liquate out and carry with it a large proportion of the silver. As the results are imperfect, the process cannot be carried through in one operation, and a large amount of bye-products is created which must be worked up subsequently. The process, as her
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