Wet desulfurization additive for reducing selenium pollutant content of desulfurization gypsum and application of wet desulfurization additive
A wet desulfurization and desulfurization gypsum technology, which is applied in the direction of protection devices against harmful chemicals, can solve the problems of lack of feasible and effective methods, and achieve the effect of reducing secondary release and emission reduction
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Embodiment 1
[0031] The desulfurization slurry of a power plant in Shanxi Province was used as the reactant. Slurry is carried out solid-liquid separation with Buchner funnel after sample preparation respectively, adopts inductively coupled plasma mass spectrometry (ICP-MS) to detect the selenium pollutant content, obtains the selenium pollutant content in the original slurry to be 10.53mg / L: wherein every liter of slurry The content of selenium pollutants in medium desulfurization gypsum is 8.33mg; the content of selenium pollutants in liquid phase is 2.20mg. The content of selenium pollutants in desulfurized gypsum is extremely high, which is harmful to human health.
[0032] 100 parts of oxidant and 0 part of catalyst are used as additives, wherein the oxidant component is potassium persulfate, and the catalyst component is copper sulfate pentahydrate. Add the oxidant and catalyst to the desulfurization slurry (60°C, pH=5.5) for reaction. In this example, 4 kinds of additives with diff...
Embodiment 2
[0034] The desulfurization slurry in Example 1 was used as a reactant, 88.9 parts of oxidant and 11.1 parts of catalyst were used as additives, wherein the oxidant component was potassium persulfate, and the catalyst component was copper sulfate pentahydrate. The oxidizing agent and the catalyst are respectively added to the desulfurization slurry (60°C, pH=5.5) for reaction. In this example, 4 kinds of additives are added, namely: 2g / L, 5g / L, 10g / L, and 20g / L. The result is as figure 2 It was shown that the addition of additives above 5g / L can effectively promote the migration of selenium pollutants from desulfurized gypsum to the liquid phase, and reduce the content of selenium pollutants in desulfurized gypsum. Compared with Example 1, the amount of additive required to promote the migration of selenium pollutants and the content of selenium pollutants in desulfurized gypsum with the same amount of addition are both reduced, indicating that the catalyst has a significant r...
Embodiment 3
[0036] The desulfurization slurry in Example 1 was used as a reactant, 90.9 parts of an oxidant, and 9.1 parts of a catalyst were used as additives, wherein the oxidant component was ammonium persulfate, and the catalyst component was copper nitrate. The oxidizing agent and the catalyst were respectively added to the desulfurization slurry (50° C., pH=5.0) for reaction. In this example, the amount of additive added was 11 g / L.
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