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Method for catalytic oxidation of sulfur dioxide tail gas used as ph value regulator in phosphate ore beneficiation

A sulfur dioxide and catalytic oxidation technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as consumption and complex flotation effects, and achieve the effects of simple process, reduced operating power, and strong applicability

Active Publication Date: 2016-06-15
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their influence on flotation is more complex, both activation and inhibition, and some can consume various chemicals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] With phosphorus raw ore pulp (mass fraction of main chemical components in phosphorus raw ore powder: P 2 o 5 22.4%; MgO7.0%; SiO 2 : 18.4%; CaO: 30.7%; Fe 2 o 3 :1.6%; GeO 2 : 0.06%, CuO: 0.01%. -200 mesh content 92%, the solid content of the phosphate rock slurry formed with water is 47%), iron, germanium and copper are metal ions as catalysts, adding EDTA disodium buffer with a mass fraction of 0.08, in the dynamic wave desulfurization tower (The desulfurization temperature is controlled at 55°C; the sulfur dioxide tail gas flow rate is 26m / s; the liquid-gas volume ratio is 1 (m 3 )︰0.5 (L)) form countercurrent contact with the sulfur dioxide tail gas from the absorption tower, and form a sulfuric acid solution after absorbing sulfur dioxide to decompose the raw phosphorus ore pulp. The tail gas after desulfurization treatment reaches 320mg / m3 of the new national standard tail gas 3 Emission Standards.

Embodiment 2

[0028] With phosphorus raw ore pulp (mass fraction of main chemical components in phosphorus raw ore powder: P 2 o 5 22.6%; MgO6.3%; SiO 2 : 16.9%; CaO: 33.2%; Fe 2 o 3 :2.0%; GeO 2 : 0.05%, CuO: 0.01%. The content of -200 mesh is 92%, the content of -200 mesh is 94%, and the solid content of the phosphate rock slurry formed with water is 51%. Metal ions such as iron, germanium and copper are used as catalysts, and EDTA disodium with a mass fraction of 0.06 and 0.05 Sodium citrate buffer, in the power wave desulfurization tower (the desulfurization temperature is controlled at 87°C; the sulfur dioxide tail gas flow rate is 23m / s; the liquid-gas volume ratio is 1 (m 3 ): 0.6 (L)) form a countercurrent contact with the sulfur dioxide tail gas from the absorption tower, absorb sulfur dioxide and form a sulfuric acid solution to decompose the raw phosphorus ore pulp. The tail gas after desulfurization treatment reaches 300mg / m3 of the new national standard tail gas 3 Emissi...

Embodiment 3

[0030] With phosphorus raw ore pulp (mass fraction of main chemical components in phosphorus raw ore powder: P 2 o 522.8%; MgO7.2%; SiO 2 : 19.9%; CaO: 31.5%; Fe 2 o 3 :2.2%; GeO 2 : 0.03%, CuO: 0.02%. -200 mesh content 90%, the solid content of the phosphate rock slurry formed with water is 53%), metal ions such as iron, germanium and copper are catalysts, adding a mass fraction of 0.15 sodium phosphate solution, in the power wave desulfurization tower (desulfurization temperature Control at 110°C; sulfur dioxide tail gas flow rate is 22m / s; liquid-gas volume ratio is 1 (m 3 ): 0.7 (L)) to form a countercurrent contact with the sulfur dioxide tail gas from the absorption tower, and form a sulfuric acid solution after absorbing sulfur dioxide to decompose the raw phosphorus ore pulp. The tail gas after desulfurization treatment reaches 315mg / m3 of the new national standard tail gas 3 Emission Standards.

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Abstract

The invention discloses a method for catalytic oxidation of sulfur dioxide tail gas to be used as a pH value regulator in phosphorous ore beneficiation. It uses high-valent metal ions such as soluble iron (Ⅲ) and germanium (Ⅳ) in the raw phosphorus ore slurry as catalysts, and copper (Ⅱ) ions act synergistically, adding a small amount of buffer, and reacting with the sulfur dioxide from the absorption tower in the power wave desulfurization tower Tail gas forms countercurrent contact, absorbs sulfur dioxide and forms sulfuric acid solution to decompose phosphate rock slurry, and the phosphoric acid formed after decomposition is used as a pH value adjusting agent in phosphate rock flotation, realizing the coupling technology of phosphorus chemical industry and phosphate rock beneficiation and mineralization. The tail gas after desulfurization treatment reaches the emission standard of ≤400mg / m3 of the new national standard tail gas. The method for purifying sulfur dioxide tail gas in the production of sulfuric acid disclosed by the invention has simple process and strong applicability, and realizes the coupled technology of phosphorus chemical industry and phosphorus ore beneficiation and mineralization, which is of great significance in terms of resources and environmental protection.

Description

technical field [0001] The invention discloses a method for catalytic oxidation of sulfur dioxide tail gas to be used as a pH value regulator in phosphorous ore beneficiation. In particular, it relates to a method for reducing sulfur dioxide tail gas in sulfuric acid production. It belongs to the field of phosphorus chemical industry and phosphorus ore dressing production. Background technique [0002] SO 2 It is the main pollutant in the atmosphere. It not only has a toxic effect on the human body, but also causes acid rain, so it has always been one of the pollutants that are strictly controlled. So far, various dry and wet flue gas desulfurization technologies have been applied in research at home and abroad. For high-concentration SO 2 It can be effectively recycled and utilized now, but the existing desulfurization technology has problems such as large investment, high operating cost, easy corrosion of pipelines, complicated process flow, and complicated operation, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/86
Inventor 樊崇生张晖何宾宾陆伟才罗昆义
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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