IV. TECHNICAL. 537 



2725. No. 2. Burnt Ore, or cinder remaining after the 

 almost complete elimination of the sulphur from the pyrites as 

 sulphurous anhydride. Widnes Metal Company* 



Water 



Sulphur 



Arsenic 



Iron 



Copper 



Zinc 



Cobalt 



Silver 



Lead 



Lime 



Oxygen and loss 



Insoluble residue 



100-00 



2726. No. 3. Mixture of Burnt Ore and Salt (the latter 

 being about 12 per cent, of the whole), ground and passed through 

 sieve of about 16 holes per square inch. 



Widnes Metal Company. 



This mixture is furnaced' during a period of 5| hours, at the expiration of 

 which time the copper has usually been almost entirely converted into a 

 soluble chloride of that metal. 



2727. No. 4. Mixture of Salt and Burnt Ore after calcina- 

 tion during 5| hours. Widnes Metal Company. 



2728. No. 5. Purple Ore, or residue left from No. 4 after 

 the extraction of the copper by Jixiviation with hot water and 

 dilute hydrochloric acid. Widnes Metal Company. 



This residue is chiefly employed for the " fettling " of puddling furnaces. 

 Ferric oxide 

 Lead /- 



Copper 

 Cobalt 

 Alumina 

 Lime 

 Soda 



Phosphoric anhydride 

 Arsenic 



Sulphuric anhydride 

 Sulphur 

 Chlorine 

 Silica 



100-15 



2729. No. 6. Purple Ore compressed into blocks for use in 

 the blast furnaces (the brick exhibited was made by Messrs. N. 

 Mathieson & Co., of Widnes). Widnes Metal Company. 



