Electrochemical and metallurgical industry . unds, at $5 per ton 6 cents Sulphuric acid for copper-iron solution, anti-mony solution, making silver sulphate, 9pounds at i cent 9 Soda ash, 10 pounds, at i cent 10 Other chemicals, nitric acid for gold, lossesin silver solution S Hydrofluoric acid loss i pound, at 3 3 33 Power for depositing 20 pounds 18 depositing 52 pounds copper and making ferric sulphate 25 Refining 20 pounds silver i Total, at $30 per of 365 days 44 $ 2250 pounds steam for heating solution 20 pounds coal for
Electrochemical and metallurgical industry . unds, at $5 per ton 6 cents Sulphuric acid for copper-iron solution, anti-mony solution, making silver sulphate, 9pounds at i cent 9 Soda ash, 10 pounds, at i cent 10 Other chemicals, nitric acid for gold, lossesin silver solution S Hydrofluoric acid loss i pound, at 3 3 33 Power for depositing 20 pounds 18 depositing 52 pounds copper and making ferric sulphate 25 Refining 20 pounds silver i Total, at $30 per of 365 days 44 $ 2250 pounds steam for heating solution 20 pounds coal for melting antimony and silver, at $4. , 10 men required for plant refining slime from lOO-ton lead refinery 25 Allow for supplies and repairs 10 Total cost per ton of lead of analysis given $ The copper oxide used is not figured in as an element of cost,as copper in oxide is worth less than as electrolytic metal,so that a gain is made, rather than the cost increased. This works out at a cost of about one and one-half cents per. ?????? m ?????? m^- ???ann m-- ?????? m ?????? m FIG. 3.—ELECTROLYTIC SLIME ARRANGEMENT OF PLANT pound of slime, and when it is remembered that it costs cop-per refineries one cent per ounce, or more, to collect theirsilver—that is, with a slime carrying 50 per cent silver, sevencents per pound, or more, to treat it, besides throwing awaythe by-products and losing at least one per cent of silver, whichloss may be apparently more than covered by the loss incommercial fire-assay—the superiority of the electrochemicalmethod, working at less than one-fourth the cost, and savingeverything of value,-is apparent. The electrochemical processon a 100-pound lot of slime has given a return of silver equalto corrected fire-assay, or one and one-fourth per cent higherthan commercial assay. The general arrangement of the plant is .shown in Fig. 3. My thanks are due Dr. Edward F. Kern for much valuableassistance. AL .\\\) M
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
