Treatment process suitable for rapidly oxidizing magnesium sulfite to magnesium sulfate

Abstract

The invention relates to a treatment process suitable for rapidly oxidizing magnesium sulfite to magnesium sulfate. The process is characterized by comprising the steps of pumping a magnesium sulfite slurry with a certain concentration into an efficient oxidizer; adding a catalyst (copper-cobalt-aluminum composite salt) with a concentration of 0.001-0.003 mol/L in the efficient oxidizer; oxidizing for one hour, and thus magnesium sulfite solid in a desulfurated slurry is almost oxidized completely; transferring the oxidized magnesium sulfite into a condensation reactor; adding a coagulant and coagulant aid so that solid impurities in the slurry are condensed into easily settled large particles; introducing the slurry into a purifier to carry out two-phase separation so as to remove the solid impurities from the solution; overflowing a supernatant liquid to a buffer tank for use by an evaporation and concentration system; and crystallizing the solution in the buffer tank by evaporation and concentration to produce magnesium sulfate heptahydrate. The treatment process has the beneficial effects that by adding the catalyst, oxidation rate is shortened to one hour and power consumption and operation cost are reduced; reuse rate of the catalyst reaches 75%; catalyst cost is reduced; and environmental waste can be treated harmlessly and recycled efficiently.

Description

technical field [0001] The invention relates to a waste water recycling technology for improving the oxidation effect by using a catalyst, in particular, it is a technology suitable for rapid catalytic oxidation of magnesium sulfite, a by-product of wet magnesium desulfurization, to generate magnesium sulfate. Applied in the field of environmental protection and circular economy. Background technique [0002] In the process of wet magnesium desulfurization, a large amount of mixed slurry containing magnesium sulfite will be produced. If the slurry is discarded directly or after solid-liquid separation, a large amount of pollutants will be generated, causing secondary pollution, and the waste desulfurization product will lose a lot of Sulfur and magnesium elements, while the conventional terminal treatment technology has the problems of difficult effective settlement and high operating costs. If the magnesium sulfite in the desulfurization product is converted into magnesium...

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Problems solved by technology

Treatment with this process can reduce the content of dissolved sulfite in the slurry, but cannot reduce the content of slightly soluble magnesium sulfite, and cannot be recycled to produce magnesium sulfate

Chinese patent CN101244360A discloses the catalytic oxidation process of calcium sulfite, which is to add soluble ferrous salt and manganese salt catalyst in the desulfurization slurry, which promotes the absorption of sulfur dioxide in the flue gas and reduces the possibility of system fouling, but cannot fully desulfurize the sulfur dioxide. Sulfate oxidation, also not suitable for catalytic oxidation of magnesium sulfite

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