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. 1897 Excerpt: ...to increase the chances of such intimate contact as will ensure amalgamation. Sometimes steps are made in the tables, giving the thin stream of pulp a little drop, Rometimes the tables are shaken, whilst in the Hungarian mill the pulp flows over the surface of a bath of mercury, the surface of which is lightly skimmed ...
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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. 1897 Excerpt: ...to increase the chances of such intimate contact as will ensure amalgamation. Sometimes steps are made in the tables, giving the thin stream of pulp a little drop, Rometimes the tables are shaken, whilst in the Hungarian mill the pulp flows over the surface of a bath of mercury, the surface of which is lightly skimmed by revolving iron knives. Amalgamation will not take place unless the two metals are bright and clean; any slight film upon the mercury, such as is produced by grease or tarnish, prevents contact, and the little particle of gold rolls or slides down over the plate, just as it would do on a plain sheet of copper, and is liable to escape. The greatest care has therefore to be taken to keep the amalgamated plates clean, and from time to time any tarnish may be removed by brushing them with a solution of cyanide of potassium. Other means of keeping quicksilver bright are the addition of a little sodium amalgam, or the production of nascent hydrogen upon the surface of a mercury bath by the passage of a current of electricity. This is the principle of Molloy's amalgamator, and that invented by Chaster and Beck. It is evident from experiments, when the mercury covered with water is connected to the negative pole of a dynamo, and lead plates forming the anode are connected to the positive pole, that the disengagement of hydrogen does keep the bath constantly bright and lively, and fully entitles the metal to its familiar name "quicksilver." Under these circumstances it takes hold of the gold more readily, but the process does not appear to have gone beyond the experimental stage at present. Considering the ease with which amalgamation is impeded or prevented by a flimsy coating upon the mercury or upon the gold, it is not surprising that ru...
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