Pyrite fines with mole fraction 0.70 FeS2 and the balance gangue are combusted using dried air in a double absorption contact plant producing H2SO4. The gas exiting the burner analyzes 7.0% SO2 and 7.5% O2 (SO3-free). This gas passes to a primary converter (C1) and then sent to a primary absorption tower (T1). The tail gas from T1 is passed to a secondary converter (C2) and then to a secondary absorption tower (T2). Twelve percent of the overall oleum product from the T2 is recycled to absorb the moisture in the feed air and then diluted with additional makeup water before being used as absorbing acid for T1.The dried air in this step is used for burning the pyrite.The product acid of T1 is used in T2 to form the 12% oleum product.The converters can achieve 76% conversion while the absorption towers absorb 92% of the influent SO3. Assume that no additional oxidation of SO2 to SO3 occurs in the absorbers. Also assume that all FeS2 is burned and no burner gas is lost in the cinders. Task: Draw a block flow diagram of the process.
Pyrite fines with mole fraction 0.70 FeS2 and the balance gangue are combusted using dried air in a double absorption contact plant producing H2SO4. The gas exiting the burner analyzes 7.0% SO2 and 7.5% O2 (SO3-free). This gas passes to a primary converter (C1) and then sent to a primary absorption tower (T1). The tail gas from T1 is passed to a secondary converter (C2) and then to a secondary absorption tower (T2). Twelve percent of the overall oleum product from the T2 is recycled to absorb the moisture in the feed air and then diluted with additional makeup water before being used as absorbing acid for T1.The dried air in this step is used for burning the pyrite.The product acid of T1 is used in T2 to form the 12% oleum product.The converters can achieve 76% conversion while the absorption towers absorb 92% of the influent SO3. Assume that no additional oxidation of SO2 to SO3 occurs in the absorbers. Also assume that all FeS2 is burned and no burner gas is lost in the cinders.
Task: Draw a block flow diagram of the process.
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