A kind of method that ammonium fluoride waste water prepares phosphate pulp desulfurizer

Abstract

Large volume of flue gas containing sulfur dioxide with low concentration is generated in an industrial process, phosphoric ore slurry desulfurization has obvious technical advantages in phosphorus chemical production enterprises, so the popularization and application are achieved. The absorption efficiency of phosphoric ore slurry to sulfur dioxide is not stable due to the influence of fluctuation of flue gas volume and change of the sulfur dioxide concentration in the flue gas. The method provided by the invention adopts ammonium fluoride wastewater and phosphate rock powder discharged in the phosphorus chemical enterprises to prepare a desulfurization absorber, so that the sulfur dioxide with low concentration in the flue gas can be absorbed. The method comprises the steps of uniformly mixing the pretreated ammonium fluoride wastewater and fine-grained phosphoric ore to obtain the desulfurization absorber with 15 to 50 percent of solid content, and the pH value is 8.0 to 9.0, the liquid-gas ratio is controlled to be 4-12 L / m<3> in an absorption process; when the pH value of circulating slurry is less than 4.0, discarding 50 percent of absorption slurry, and adding the same amount of newly prepared phosphoric ore slurry absorption liquid into a circulating tank. The prepared absorbent has stable desulphurization efficiency, and the obvious influences of the sulfur dioxide concentration and of the fluctuation of the flus gas volume to the absorption efficiency of the sulfur dioxide do not exist. According to the method, waste control by waste is realized, and the method has the characteristics of being simple in process facility, low in cost of operation, cheap and easily obtained materials.

Description

technical field

[0001] The invention relates to a method for preparing phosphate rock slurry in the technology of absorbing sulfur dioxide by phosphate rock pulp, and belongs to the technical field of preparation of industrial waste gas purification absorbents. Background technique

[0002] Industrial processes produce a large amount of flue gas containing low concentrations of sulfur dioxide. At present, my country's low-concentration sulfur dioxide treatment technologies mainly include limestone-gypsum wet desulfurization, ammonia desulfurization, activated carbon adsorption desulfurization, and phosphate slurry desulfurization. In addition to phosphorus, phosphate rock powder also contains 0.9-1.5% Fe 2 o 3 , 0.4~0.6% MnO 2 and other components. During the desulfurization process of phosphate rock pulp, the transition metal elements Fe, Mn and trace rare earth elements in the pulp can be used as desulfurization catalysts to catalyze the oxidation of sulfur dioxide to ...

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