METAL INDUSTRY BY-PRODUCTS 65 



can be converted into sulphate of ammonia, and the combust- 

 ible gas, together with any coke and lime left, can be added 

 to the blast furnaces, when all the potassium would be vola- 

 tilized into the blast-furnace gases, to be recovered as flue 

 dust. Most of such miscellaneous refuse would contain 

 sufficient sodium chloride to render all the potassium volatile, 

 but if it did not do so it would be easy to add the necessary 

 chlorides. In addition, the whole of the phosphorus would 

 be concentrated in the pig iron, to be converted into basic 

 slag, in course of time, in the basic open-hearth or Bessemer 

 process. Low-grade basic slags could, as a matter of fact, 

 be returned to the blast furnace when all iron and phosphorus 

 in them would come out with the pig. The next process of 

 purification would therefore produce a richer basic slag, 

 in addition to recovering a good deal of iron which is at 

 present wasted. It would, however, take a good deal of 

 courage and enterprise to initiate any complete process 

 based on such lines. 



REFERENCES TO SECTION III. 



Hamilton, " Recovery of By-products from Blast Furnace Gases," 

 Journ. Soc. Chem. Ind., 1916, p. 663. 



Catlett, " Blast Furnace as Potash Producer," Chem. Eng., 1916, 23, 198. 

 De Beers, " Development of our Potash Industries." Chem. Eng. Manuf. t 



1917, 24, No. 5. 



Wysor, " Potash as a By-product from the Blast Furnace," Journ. Soc. 

 Chem. Ind., 1917, 327. 



Burchard, " Potash as a By-product in the Cement and Iron Industries," 

 Chem. Eng. Manuf., 1917, 24, No. 3. 



Grasby, " Southern Iron Ores as a Source of Potash,," Chem. Eng. 

 Manuf., 1916, 24, 184. 



Cranneld, " A New Source of Potash," Journ. Bd. Agric., 1917, 24, 526. 



Louis, " La Guerre pour le Mineral de Fer," Journ. Soc. Chem. Ind., 



1918, p. 333 R- 



Chance, " The Prospects of Founding a Potash Industry in this Country," 

 Journ. Soc. Chem. Ind., 1918, p. 222 T. 



" Potash Production in Great Britain," Journ. Soc. Chem. Ind., 1918, 



p. 313 R- 



Bush, " The Cottrell Electrostatic Recovery Process of Flue Dust and 

 Fumes," Journ. Soc. Chem. Ind., 1918, p. 389 R; " Potash Recovery at 

 Blast Furnaces and Cement Works," ibid., 1917, p. 327. 



Cottrell, " The Electrical Precipitation of Suspended Particles," Journ. 

 Ind. Eng. Chem., 1911, p. 542 ; Journ. Soc. Chem. Ind., 1919, p. 121 T. 



Cresswell, " Possible Sources of Potash," Journ. Soc. Chem. Ind., 1915, 



P- 387- 



Rossiter and Dingley, "Some Chemical Aspects of the Potash Industry 

 in Great Britain," Journ. Soc. Chem. Ind., 1919, p. 376 T. 



v. 5 



