Copperas, evaporation

In 1821 John Locke described a pyrite mine and copperas plant at Strafford, Vermont. To facilitate crystallization of the green vitriol, branches of trees were put into the evaporating cisterns as nuclei for the crystals. The branches, said Locke, have a fine crop of foliage and fruit composed of beautiful green crystals.. . . Everything about this mineral manufactory is curiously reddened with iron rust. When a dry... 

Total costs of the evaporator system and the carbon bed to upgrade the by-product have been estimated to be about 0.05/lb of contained Aids. Recent potable grade copperas coagulant has been quoted at 0.10/lb delivered in the Houston area and thus, the recovered AICI3 would be more than competitive. This use in potable water treating also will provide an expanded and more stable market for the aqueous AICI3. 

Sulphate of Iron. Commercial sulphate of iron is known also as Copperas, Green Vitriol, Shoemaker Black, Ac. For medicinal purposes it requires some preparation Mix 1 fluid ounce sulphurio acid with 4 pints water add 4 pounds commercial sulphate of iron, and 1 ounce iron wire digest with heat and occasional agitation until tho sulphate is dissolved strain while hot, and set otfido so that crystals may form evaporate tho mother-liquor Yor more crystals, and dry the whole. Cooley )... 

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