The Manufacture of Pulp And Paper : a Textbook of Modern Pulp And Paper Mill Practice
The Manufacture of Pulp And Paper : a Textbook of Modern Pulp And Paper Mill Practice
Joint Textbook Committee of the Paper Industry
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at 20°C. and atmospheric pressure, producing a burner gas containing 11.75 cu. ft. of S0 2 . Since the strength of the burner gas is assumed to be 16% 11.75 cu. ft. of oxygen required to produce this strength represents 16% of the total air admitted, assuming all the oxygen to be converted to sulphur dioxide. (In practice, a slight excess is required.) Therefore, volume of air = \ = 73.4 cu. ft 0.16 The air and sulphur should be as dry as possible, since the pres- ence of moisture encourages th...e formation of sulphuric acid. GASES FROM PYRITES FURNACE 29. Amount of S0 2 Obtained from Pyrites.— When sulphur dioxide is formed from pyrites, the following reaction takes place. 2FeS 2 4- 110 = Fe 2 3 + 4S0 2 18 MANUFACTURE OF SULPHITE PTTP §4 In this case, one portion of the oxygen is consumed in the oxida- tion of iron to iron oxide, and, from the equation, it is seen that, with pure pyrites, 3 volumes of oxygen are used in this oxidation for everj^ 8 volumes of oxygen required in the formation of sulphur dioxide.
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