File:View of Precipitating Tanks - Rio Tinto Mines.jpg

English:

Identifier: transactionsmining35amer
Title: Transactions
Year: c. 1871
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York [etc.]
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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Text Appearing Before Image: serial View of Precipitating Tanks, Copper Liquor Dam and Mineral Heaps. WORK METHODS OF EXTRACTING COPPER AT RIO TINTO, SPAIN. Fig. 8.

Text Appearing After Image: View Showing the Method of Removing the Cement-Copper from the Precipitating Tanks. tanks as necessary, depending on the quantity of liquor that isbeing run through and on the varying temperature of theliquor with different seasons, the hotter the solution, which insummer reaches 100° F., the faster the rate of precipitation.Each tank is about 320 ft. long, 5.5 ft. wide and 2.25 ft. deepand has a slope varying from 2 per 1,000 in the first series to11 per 1,000 in the last, the reason for the increase in slopebeing, that as the liquor becomes impoverished in copper, thefree acid present is more active in wastefully dissolving thepig-iron,—an action which is considerably diminished by in-creasing the velocity of the liquor by means of the increasedslope of the tanks. The tanks themselves are made of 9- by3-in. boards attached to wooden frames set in cement, the spacebetween parallel tanks being filled in with stone and cement,constituting a wall supporting the sides of the tanks.

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