| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the adhesion of scale to the inner surface of a column and piping to perform stable desulfurization by using a mixed slurry obtained by the double decomposition reaction of a soln. used in the digestion of an Mg ore containing CaO and MgSO4 as an Mg type desulfurizing agent. SOLUTION: A magnesium type ore such as light burnt magnesia containing magnesium oxide, calcium oxide and impurities is added to a digestion machine 1 and water is added to the magnesium type ore to heat and react the same to obtain a digestion slurry containing magnesium hydroxide and potassium hydroxide. An oxidizing process treatment soln. is supplied to a double decomposition tank 2 from piping L1 and the digestion slurry is supplied thereto from the digestion machine 1 through piping L2 so that the pH in a desulfurizing column 3 becomes constant. Thereupon, calcium hydroxide and magnesium sulfate react to form gypsum particles and magnesium hydroxide particles to become a mixed slurry having magnesium sulfate dissolved therein. This mixed slurry is used as a desulfurizing agent to be supplied to the desulfurizing tower 3 from piping L3 by a pump 3.</p> |
