Production system of desulfurization product magnesium sulfate regenerative desulfurization adsorbent magnesium hydroxide

Abstract

The invention provides a production system of new desulfurization product magnesium sulfate regenerative desulfurization adsorbent magnesium hydroxide. The system takes desulfurization product magnesium sulfate and cheap calcined dolomite in powder as raw materials, converts sulphur in the magnesium sulfate into chemical-grade gypsum through regeneration and transformation, and reduces magnesium in magnesium sulfate into chemical-grade magnesium hydroxide, wherein the gypsum serves as the raw material for papermaking and building materials, and magnesium hydroxide is used for flue gas efficient desulfurization or serves as the raw material of magnesium salt. The system overcomes the problem of conversion of traditional magnesium desulphurization product magnesium sulfate, effectively solves the problems of transfer of magnesium sulfate to high-end products and the recycling of magnesium sulfate, is simple in equipment and process, convenient to operate and maintain, and stable and reliable in operation, further improves the desulfurization efficiency and reduce the cost, meanwhile lays a foundation for centralized treatment of desulfurized solution, and shows a way for the future development of desulfurization modes.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to a sewage treatment system which uses magnesium sulfate, a desulfurization product of a magnesium method and a dolomitic lime method, as a raw material to regenerate a desulfurizing agent magnesium hydroxide. Background technique [0002] The use of magnesium oxide (magnesium method) in flue gas desulfurization technology is a relatively new desulfurization process introduced into my country in the 1980s. The basic principle is to convert magnesium oxide into magnesium hydroxide slurry by hydrolysis and digestion, and reverse flow with flue gas in the desulfurization tower. Absorption, using acid-base neutralization reaction to remove SO in flue gas 2 , SO 3 Convert into magnesium sulfate liquid, then concentrate and crystallize the magnesium sulfate liquid to obtain agricultural magnesium sulfate heptahydrate (MgSO 4 ·H 2 O). In recent years, ba...

AI Technical Summary

Problems solved by technology

The product after desulfurization is magnesium sulfate solution, and its mass percentage concentration is generally about 5-20%. Due to market reasons, many desulfurization enterprises do not choose to obtain magnesium sulfate heptahydrate by evaporation and crystallization or calcined into other magnesium sulfate solids with different crystal waters. , but directly discharge the desulfurization product magnesium sulfate solution or dilute it with water and discharge it into the ground, forming secondary pollution of groundwater

[0003] Therefore, although the existing magnesium desulfurization process and system equipment have the advantages of high desulfurization efficiency, simple process equipment, low investment cost, and simple operation and maintenance, there are also problems such as large quantities of magnesium sulfate desulfurization products and high difficulty in market digestion. Failure to reasonably resolve the whereabouts of magnesium sulfate products will cast a shadow on the prospect of magnesium desulfurization

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