2 results about "Calcium sulfite" patented technology

The invention relates to a calcium sulfate catalytic oxidation process in limestone-gypsum wet flue gas desulfurization, which adopts the technical proposal that soluble ferrous salt and manganic salt or the mixture of the soluble ferrous salt and magnetic salt is used as catalyst and added in the slurry with absorbed SO2; the concentration of the soluble ferrous salt and manganic salt is 0.001 to 0.05mol/L; the pH value of the slurry with the added catalyst is 5 to 6. The calcium sulfate catalytic oxidation process has the advantages of greatly increasing the oxidation rate of the calcium sulfate, stabilizing the pH value of the system, facilitating the desulfurization operation with cheap and recyclable catalyst in the absorption tower, increasing the absorption rate of the SO2 due to the increased the oxidation rate of the calcium sulfate and reducing the scale possibility of the system.

The invention discloses a double-alkali flue gas desulfurizing method, and relates to the field of waste gas treatment. The double-alkali flue gas desulfurizing method comprises the following steps: S1, producing an absorbent; S2, absorbing SO2in a desulfurization tower; S3, regenerating the absorbent in a regeneration tank; S4, supplementing alkali water; S5, treating a sulfurized product. Through use of waste alkali water as a regenerant, the desulfurization cost is saved and the environment is protected; a desulfurization product is calcium sulfite, which has a great effect in life.