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Method for preparing sodium sulfate from baking soda desulfurized fly ash by wet process

A desulfurization ash and baking soda technology, applied in the direction of sulfate/bisulfate preparation, etc., can solve the problems of low reaction efficiency, high dust content, affecting product purity, etc., and achieve simple process flow, cheap and easy-to-obtain equipment, and economic benefits obvious effect

Pending Publication Date: 2022-03-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the glass furnace is suitable for solid raw materials, the dust content is high, and the desulfurization by-products have high impurity content. This method lacks effective control of product purity, and it is difficult to obtain high-purity sodium sulfate products.
In addition, the blast oxidation adopted in this method is a typical gas-liquid two-phase reaction, not only the reaction efficiency is low but also the oxidation rate of sodium sulfite cannot be guaranteed, and there are no corresponding measures in the technical scheme, which will inevitably affect the product purity.

Method used

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  • Method for preparing sodium sulfate from baking soda desulfurized fly ash by wet process
  • Method for preparing sodium sulfate from baking soda desulfurized fly ash by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) The baking soda desulfurization ash to be disposed of is sampled and analyzed, and the results show that it consists of: Na 2 SO 4 32%, Na 2 SO 3 11%, NaHCO 3 54%, other components are a small amount of crystal water and / or unavoidable impurities.

[0035] 2) Put 200g of baking soda desulfurization ash into a stirring tank, add 200g of pure water, heat the mixture to 34°C to prepare a suspension, and stir for 12min.

[0036] 3) Add 24g of 30wt% hydrogen peroxide solution (equivalent to H2) in the stirring tank 2 o 2 about 0.21mol), and kept stirring at 34°C for 20min.

[0037] 4) add 25wt%% dilute sulfuric acid solution 327g (equivalent to H 2 SO 4 about 0.83mol), and kept stirring at 34°C for 7min.

[0038] 5) The mixture is transferred to the crystallizer, and the calculation shows that Na in the reacted mixture 2 SO 4 The mass is about 180g. In order to ensure product purity and yield, the mixture was heated to evaporate part of the water until the ...

Embodiment 2

[0041] 1) The baking soda desulfurization ash to be disposed of is sampled and analyzed, and the results show that it consists of: Na 2 SO 4 58%, Na 2 SO 3 18%, NaHCO 3 22%, other components are a small amount of crystal water and / or unavoidable impurities.

[0042] 2) Take 250g of baking soda desulfurization ash and put it in a stirring tank, then add 300g of pure water, heat the mixture to 46°C to prepare a suspension, and stir for 12min.

[0043] 3) Add 58g of 30wt% hydrogen peroxide solution (equivalent to H2) in the stirring tank 2 o 2 about 0.51mol), and kept stirring at 46°C for 40min.

[0044] 4) add 50wt% dilute sulfuric acid solution 83g (equivalent to H 2 SO 4 About 0.42mol), keep stirring at 46°C for 12min.

[0045] 5) The mixture is transferred to the crystallizer, and the calculation shows that Na in the reacted mixture 2 SO 4 The mass is about 242g. In order to ensure product purity and yield, the mixture was heated to evaporate part of the water ...

Embodiment 3

[0048] 1) The baking soda desulfurization ash to be disposed of is sampled and analyzed, and the results show that it consists of: Na 2 SO 4 45%, Na 2 SO 3 14%, NaHCO 3 38%, other components are a small amount of crystal water and / or unavoidable impurities.

[0049] 2) Take 300g of baking soda desulfurization ash and put it in a stirring tank, then add 370g of pure water, heat the mixture to 40°C to prepare a suspension, and stir for 12min.

[0050] 3) Add 49g (equivalent to H) of 30wt% hydrogen peroxide solution in the stirring tank 2 o 2 about 0.43mol), and kept stirring at 40°C for 32min.

[0051] 4) add 40wt% dilute sulfuric acid solution 198g (equivalent to H 2 SO 4 about 0.81mol), and kept stirring at 40°C for 10min.

[0052] 5) The mixture is transferred to the crystallizer, and the calculation shows that Na in the reacted mixture 2 SO 4 The mass is about 279g. In order to ensure product purity and yield, the mixture was heated to evaporate part of the wa...

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Abstract

The invention relates to a method for preparing sodium sulfate from baking soda desulfurized fly ash by a wet process, which comprises the following steps: firstly detecting the content of each component in the baking soda desulfurized fly ash, mixing with water to prepare turbid liquid after the content is qualified, then sequentially adding an oxidizing agent and an acid reagent for reaction, and finally evaporating, crystallizing and separating to obtain a target product Na2SO4. 10H2O. By means of the method, the steel mill solid waste baking soda desulfurization ash can be thoroughly converted into a high-purity and high-economic-value sodium sulfate hydrate product, the product is widely applied to multiple industries such as chemical engineering, food and pharmacy, and good economic benefits can be generated. Compared with existing other desulfurization ash solid waste resource recycling and reusing methods, the method has the advantages of being large in treatment capacity, thorough in conversion, high in product purity, little in waste water, free of limitation of other conditions and the like, and construction of green steel mills is promoted.

Description

technical field [0001] The invention relates to the technical field of resource recycling of desulfurization ash solid waste, in particular to a method for preparing sodium sulfate by a wet method of baking soda desulfurization ash. Background technique [0002] In long-process iron and steel enterprises, gas-fired power generation is often used to recover and generate electricity from excess blast furnace / converter / coke oven gas. In recent years, with the popularization of national ultra-low emission requirements in the steel industry, gas-fired boilers generally use baking soda dry desulfurization process to purify flue gas. Although the baking soda dry desulfurization process meets the requirements of ultra-low emission of flue gas, it also brings the secondary pollution problem of by-product desulfurization ash. Practice has shown that the composition of baking soda desulfurization ash is complex and changeable, and the corresponding utilization methods are relatively l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/06
CPCC01D5/06C01P2006/80
Inventor 康凌晨张树华夏秋雨汪颖李富智张华刘瑛叶兵韩斌
Owner 武汉钢铁有限公司
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