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A method for acid oxidation modification of sintering flue gas semi-dry desulfurization ash

A semi-dry desulfurization and oxidation modification technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of poor oxidation efficiency and speed up the oxidation efficiency of desulfurization ash, so as to reduce reaction energy consumption, speed up oxidation efficiency, and improve The effect of content

Active Publication Date: 2019-01-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 a method for acid oxidation modification of sintering flue gas semi-dry desulfurization ash, in which the oxygen promoter solution is evenly injected into desulfurization At the bottom of the ash mixture, the oxygen promoter can change the reaction interface in the oxidation process of desulfurization ash, thereby speeding up the oxidation efficiency of desulfurization ash; further, it can improve the purity of calcium sulfate dihydrate in the reaction product

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  • A method for acid oxidation modification of sintering flue gas semi-dry desulfurization ash
  • A method for acid oxidation modification of sintering flue gas semi-dry desulfurization ash

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Embodiment 1

[0039] A method for acidic oxidation modification of sintered flue gas semi-dry desulfurization ash according to the present invention, wherein the oxygen promoter used includes an acidic promoter, and the acidity of the acidic promoter is between sulfurous acid and sulfuric acid, that is, acidic Auxiliary pKa 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

[0052] 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 is oxidatively modified desulfurization ash, which is heated and dried at a temperature of 100° C. to obtain a dry powder. The content of calcium sulfate dihydrate in the dry powder reaches 95.3%.

Embodiment 3

[0054] 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 the low temperature condition of an open container. It is 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 reaches 94.8%.

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Abstract

The invention discloses a method for acid type oxidizing modification of semi-dry desulfurization ash of sintering flue gas and belongs to the field of resource utilization of desulfurization ash. According to the method for acid type oxidizing modification of the semi-dry desulfurization ash of the sintering flue gas, an oxidizing aid is mixed with water, and an oxidizing aid solution is obtained; oxygen-containing gas is blown into the desulfurization ash and water mixed solution, and the oxidizing aid solution is uniformly injected to the bottom of the desulfurization ash mixed solution; the oxidizing aid comprises an acid aid with the pKa1 acidity coefficient between pKal acidity coefficients of sulfurous acid and sulfuric acid and is used for oxidizing calcium sulfite in the desulfurization ash. With the adoption of the method for oxidizing modification, the reaction interface in the desulfurization ash oxidizing process is changed, the oxidizing efficiency of the desulfurization ash is improved, oxidization of the desulfurization ash in an open type reactor is realized, and a foundation is laid for resource utilization 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 a method for acid oxidation modification of sintering flue gas semi-dry desulfurization ash. 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 and ...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/46
Inventor 龙红明魏汝飞王毅璠李家新王平孟庆民春铁军狄瞻霞余正伟钱立新
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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