650 SEC. 13. CHEMISTRY. 



ANALYSIS of COPPER SOLUTION of Sp. Gr. 1 24. 



Contents per gallon. 



Grains. 



Sodium sulphate - - 10,092 



Sodium chloride - ?..,,- 4,474 



Chlorine (combined with metals) - - 4,630 



Copper - - 3,700 



Zinc ... - 480 



Lead ------ 40 



Iron ----- 32 



lame - 52 



Silver - - 3'06 



Arsenic, antimony, bismuth, &c. not estimated. 



2731. No. 8. Precipitate caused by addition of a soluble iodide 

 to solution of copper, &c. (Claudet's process), consisting of iodide 

 of silver mixed with various salts of lead, chiefly sulphate. 



Widnes Metal Company. 



2732. No. SA. Silver Precipitate, obtained by the reduc- 

 tion of the iodide by means of metallic zinc. 



Widnes Metal Company. 



Silver 5'95 



Gold - 06 



Lead - - 62'28 



Copper - - -60 



Zinc oxide- - 15-46 



Ferric - 1'50 



Lime - - - - - I'lO 



Sulphuric anhydride - 7-68 



Insoluble residue - - - -1-75 



Oxygen and loss - - - 3*62 



100-00 



2733. No. SB. Iodide of Zinc, obtained by reduction of 

 iodide of silver by metallic zinc, and used for the treatment of a 

 further quantity of argentiferous copper solution. 



Widnes Metal Company. 



2734. No. 9. Copper Precipitate thrown down by the 

 immersion of thin scrap iron in the cupreous solutions. 



Widnes Metal Company. 



(Contains on an average 75 to 80 per cent, of metallic copper.) 



2735. No. 10. Spent Liquor, or liquid remaining after com- 

 plete precipitation of copper from solution. This liquor is vim to 

 waste. Widnes Metal Company. 



