The Chemistry And Metallurgy of Copper, Including a Description of the ...
The Chemistry And Metallurgy of Copper, Including a Description of the ...
A Snowden Aaron Snowden Piggot
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Flajolot has indicated a method of ac- complishing this by means of hyposulphite of soda^ or of sulphuroiut add solution of iodine. The former reagent is employed in the following manner : The solution must contain neither hydrochlo- ric nor nitric acid,.both of which are expelled by evapo- ration with sulphuric acid. Water is then added, and a solution of hyposulphite of soda poured into the solution of thfr-mixed oxides, kept at the boiling point, till it no longer produces a black precipitat...e. The complete precipitation is known by the subsidence of the subsul- phide of copper and the absence of suspended sulphur in the supernatant liquor. This precipitate is collected on a filter, washed with boiling water, and treated] as ahready described, to convert it into oxide of copper. The zinc, nickel, or cobalt, is precipitated with carbo- nate of soda from the- filtrate from the subsulphide of copper. , By this method copper maybe separated from all those metals which are not precipitated from their acid solutions by sulphureted hydrogen.
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