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Pro-oxygenic agent for oxidation of semi-dry desulfurization ash from sintering flue gas

A semi-dry desulfurization and sintering flue gas technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of poor desulfurization and oxidation efficiency of semi-dry desulfurization and accelerate the oxidation efficiency of desulfurization ash, so as to speed up the oxidation efficiency and avoid escape , the effect of improving economic efficiency

Active Publication Date: 2017-11-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of poor oxidation efficiency of semi-dry desulfurization in the prior art, and provide an oxygen promoter for the oxidation of sinter flue gas semi-dry desulfurization ash, which changes the oxidation process of desulfurization ash The reaction interface in the reaction can accelerate the oxidation efficiency of desulfurization ash; further, the purity of calcium sulfate dihydrate in the reaction product can be improved

Method used

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  • Pro-oxygenic agent for oxidation of semi-dry desulfurization ash from sintering flue gas

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Embodiment 1

[0029] A kind of oxygen auxiliary agent used for the oxidation of sintering flue gas semi-dry method desulfurization ash of the present invention, comprises acidic auxiliary agent, and the acidity of this acidic auxiliary agent is between sulfurous acid and sulfuric acid, namely the pKa of acidic auxiliary agent 1 The acidity coefficient is between the pKa of sulfurous acid and sulfuric acid 1 Between the acidity coefficients, the oxygen promoter is used to oxidize the calcium sulfite in the desulfurization ash, the acid promoter is easily soluble in water, and the pKa of the acid promoter in 25°C water 1 The acidity coefficient is: 1.00-1.89, where the pKa 1 Is the first-order acidity coefficient of the acidic auxiliary agent, and the acidic auxiliary agent of the present embodiment is oxalic acid, and its pKa 1 is 1.27; the oxygen promoter in the present embodiment is oxalic acid, and the oxygen promoter solution is obtained after mixing oxalic acid with water. Among them:...

Embodiment 2

[0042] The basic content of this embodiment is the same as that of Example 1, except that the acidic additive is dichloroacetic acid (CHCl 2 COOH), its pKa in water at 25°C 1 is 1.30, the oxygen promoter in this embodiment is dichloroacetic acid, and the oxygen promoter solution is obtained after dichloroacetic acid is mixed with water. The oxygen promoter of the invention greatly improves the oxidation efficiency of the desulfurization ash, and realizes the oxidation of the desulfurization ash under the condition of low temperature in an open container. After the reaction, the reactant precipitate was heated and dried at a temperature of 100° C. to obtain a dry powder, and the content of calcium sulfate dihydrate in the dry powder reached 95.3%.

Embodiment 3

[0044] The basic content of this embodiment is the same as that of Example 1, except that the acidic auxiliary agent is composed of oxalic acid and dichloroacetic acid, and the mass ratio of oxalic acid and dichloroacetic acid is 2:1. The agent consists of oxalic acid and dichloroacetic acid. The use of the oxygen promoter of the present invention greatly improves the oxidation efficiency of desulfurization ash, and realizes the oxidation of desulfurization ash under low temperature conditions in an open container. Powder, the content of calcium sulfate dihydrate in the dry powder reaches 94.8%.

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Abstract

The invention discloses a pro-oxygenic agent for oxidation of semi-dry desulfurization ash from sintering flue gas, and belongs to the field of desulfurization ash recycling. The pro-oxygenic agent for oxidation of the semi-dry desulfurization ash from the sintering flue gas contains an acidic aid, and the pKa1 acidity coefficient of the acidic aid is between the pKa1 acidity coefficient of sulfurous acid and the pKa1 acidity coefficient of sulfuric acid. The pro-oxygenic agent is used for oxidizing calcium sulfite in the desulfurization ash. The acidic aid is easily dissolved in water, the pKa1 acidity coefficient of the acidic aid in water at 25 DEG C is 1.00-1.89, and the acidity aid is oxalic acid or dichloroacetic acid or a combination of the two. According to the pro-oxygenic agent, the reaction interface in the process of desulfurization ash oxidation is changed, so that oxidation efficiency of the desulfurization ash can be improved, oxidation of the desulfurization ash in an open reactor is realized, escape of SO2 is avoided, and a foundation is laid for recycling of the desulfurization ash.

Description

technical field [0001] The invention relates to the application field of resource utilization of desulfurization ash, and more specifically relates to an oxygen promoter for oxidation of desulfurization ash by semi-dry method of sintering flue gas. Background technique [0002] In 2016, the total output of crude steel in the world reached 1.6285 billion tons, a year-on-year increase of 0.8%. Among them, my country's crude steel output was 808.4 million tons (accounting for 49.6% of global crude steel production), still an increase of 1.2% year-on-year. As an important link in the modern steel production process, the sintering process is also the main pollutant emission source of the steel industry, of which more than 70% of the SO 2 from the sintering process. In the latest revision of "Iron and Steel Industry Pollution Emission Standards", SO 2 As one of the important contents, the emission control of the iron and steel industry is mandatory to achieve emission reductions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46
Inventor 魏汝飞龙红明王毅璠李家新王平孟庆民春铁军狄瞻霞余正伟钱立新黄孝山
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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