The Hunt And Douglas Process for Extracting Copper From Its Ores With An Append

Thomas Sterry Hunt

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24 The solution of the permanganate should be kept in a glass-stoppered bottle and should be tested from time to time with a solution containing a known weight of iron. For this purpose, instead of iron wire, which re- quires some time to dissolve in acid, we may conveniently use the double sulphate of protoxyd of iron and ammonia (ammonio-ferrous sulphate). The green readily soluble crystals of this salt contain exactly one-seventh their weight of iron, so that 35 grains of this salt, with 20 ...drops of sulphuric acid dissolved in half a pint of water, correspond to a solution of 5 grains of metallic iron.
n. PREPARATION AND USE OF IRON SPONGE.
The use of spongy metallic iron for precipitating copper in a metallic condition from its solutions was proposed in 1859 by Mr. William Gossage, of Widnes, England, to whom letters patent for improve- ments in extracting copper were then granted in Great Britain, the dates of the specification being March 7 and September 7 of that year (patent No.

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