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Method for preparing phosphoric ore slurry desulfurizer by ammonium fluoride wastewater

An ammonium fluoride and phosphate slurry technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as unstable sulfur dioxide absorption efficiency, achieve long desulfurization duration, avoid environmental impact problems, and desulfurization efficiency. stable effect

Active Publication Date: 2016-05-04
KUNMING ECON TECH CO LTD
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Problems solved by technology

Phosphate pulp desulfurization technology has obvious advantages in the flue gas desulfurization of phosphorus chemical production enterprises; however, affected by fluctuations in flue gas volume and changes in the concentration of sulfur dioxide in flue gas, the absorption efficiency of phosphate pulp for sulfur dioxide is very unstable

Method used

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  • Method for preparing phosphoric ore slurry desulfurizer by ammonium fluoride wastewater

Examples

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Embodiment example 1

[0018] The method for preparing phosphate pulp desulfurizer from ammonium fluoride wastewater described in this implementation case includes necessary steps such as filtration of ammonium fluoride wastewater, adjustment of ammonia concentration, grinding of phosphate rock, and pulping. This case has been successfully applied to a phosphorus chemical production in Yiliang, Yunnan enterprise. The ammonium fluoride wastewater contains 0.5-0.8% ammonia, and the solid matter in the wastewater is removed by precipitation, and the obtained filtrate is stored for later use; the phosphate rock is ground to 150 mesh, and 85% of the material is sieved; the stored ammonia-containing filtrate is prepared for solid content It is a 50% phosphate slurry desulfurizer, and the pH value of the slurry is about 8.3. The diameter of the absorption tower is 3.5m, the height is 14m; the volume of flue gas to be treated is 35000m 3 / h, the concentration of sulfur dioxide is 1800~2000mg / m 3 , the oxy...

Embodiment example 2

[0020] The steps of preparing phosphate pulp desulfurizer from ammonium fluoride wastewater described in this implementation case are exactly the same as in Example 1. This implementation case is applied to a company in Yunnan with 3000Nm 3 / h Sulfuric acid tail gas treatment pilot project. The absorption tower has a diameter of 1.2m and a height of 10m. The sulfur dioxide concentration in the sulfuric acid tail gas to be treated is 600-800mg / m 3 , the oxygen content is 4.8%; the liquid-gas ratio in the absorption process is 5L / m 3 , the superficial gas velocity is 1.5m / s. The phosphate rock pulp used is ground to 200 mesh, and 85% of the material is sieved; the ammonium fluoride wastewater used contains 0.6-1.0% ammonia, and after the solid matter in the wastewater is removed by precipitation, the ammonia concentration in the filtrate is adjusted to 4.0% , and use this stock solution to prepare a phosphate rock slurry absorbent with a solid content of 40%, and the pH value...

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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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/507B01D2258/0283B01D2259/126
Inventor 宁平李永辉陶俊法刘树根刘文政余勇才代云河贾丽娟尤艳刚
Owner KUNMING ECON TECH CO LTD
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