Wet-type desulfuration method for steel scoria with flue gas

Abstract

The invention discloses a method for steel slag wet-type desulphurization of flue gas. The method includes the following process: steel slag powder is subjected to hydrolysis and additional dissolution treatment; a steel slag solubilization liquid is obtained, added into a solid-liquid separator and mixed with steel slag absorption pregnant solution; after separation, the supernatant liquid after passing through a steel slag absorption liquid storage tank is pumped to an absorption tower where desulphurization occurs when the supernatant liquid is in contact with flue gas; or the steel slag solubilization liquid is added into the steel slag absorption liquid storage tank and mixed with the supernatant liquid, and then the steel slag solubilization liquid is pumped to the absorption tower where desulphurization occurs when the liquid is in contact with the flue gas; a steel slag absorption pregnant solution produced at the bottom part of the absorption tower is subjected to separation in the solid-liquid separator; precipitum is dehydrated in a hydroextractor, and plaster, a by-product, is obtained; and purified flue gas emitted from the bottom part or the top part of the absorption tower is discharged into the atmosphere. Compared with the traditional lime / limestone-plaster method, the invention has the advantages of ensuring the desulphurization degree of flue gas can be attained, and effectively preventing the absorption tower from scaling. Moreover, the equipment occupies a small area and is operated at a low cost, so that the economic benefits of waste utilization are improved.

Description

technical field [0001] The invention relates to a steel slag wet desulfurization method for flue gas, which belongs to the desulfurization technology of gas containing sulfur dioxide. Background technique [0002] Flue gas from coal-fired boilers and sintering processes in the steel industry both contain SO 2 , is an important object to implement desulfurization and protect the environment. [0003] At present, the flue gas desulfurization method is used to control SO 2 The most effective method for pollution, and the limestone / lime-gypsum method is the most widely used in the desulfurization method. However, due to the large amount of sintering flue gas, SO 2 The concentration is low, and the dust is mainly iron oxide powder. Therefore, the application of limestone / lime-gypsum desulfurization technology to iron and steel enterprises not only results in large investment and high operating costs; moreover, iron oxide powder makes the gypsum red, which is not conducive to t...

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Problems solved by technology

However, due to the large amount of sintering flue gas, SO 2 The concentration is low, and the dust is mainly iron oxide powder. Therefore, the application of limestone / lime-gypsum desulfurization technology to iron and steel enterprises not only results in large investment and high operating costs; moreover, iron oxide powder makes the gypsum red, which is not conducive to the further utilization of gypsum by-products; In addition, my country's gypsum resources are very rich, and a large amount of gypsum by-products has no market, and it takes a lot of money to dispose of it

[0004] The magnesium method and ammonia method in the traditional desulfurization methods are complicated in the follow-up treatment process, and the by-products are difficult to realize resource utilization, which also limits their wide application

Some new processes have emerged, such as seawater desulfurization, CFB method, NID method, electron beam method, etc., but due to the limitations of various conditions, there are not many application examples of these new processes, and they cannot meet the requirements of my country's total pollutant control policy and the needs of the enterprise's own development

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