Production method of high-purity magnesium sulfite

A technology of magnesium sulfite and production method, applied in magnesium sulfite, magnesium oxide and other directions, can solve the problems of increased desulfurization power consumption, less than 5% market share of magnesium-based desulfurization technology, small crystal particles, etc., to improve the recovery rate , to achieve the effect of value-added resources

Pending Publication Date: 2020-02-28
江苏联慧资源环境科技有限公司
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Problems solved by technology

However, this improved technology also has significant disadvantages. First, in order to improve the oxidation efficiency, the PH of the absorption liquid is reduced, and the power consumption of spraying is increased. In addition, the power consumption of oxidation is increased, and the power consumption of desulfurization is greatly increased; the second is the recovery of magnesium sulfate products. The cost is much higher than its market price
For this reason, the current market share of magnesium desulfurization technology is less than 5%, and it is still declining
The main problems in the above-mentioned magnesium oxide production process are: raw material cost and energy consumption are high, and a large amount of high-concentration saline wastewater is difficult to handle, especially because the crystal particles of the intermediate products magnesium hydroxide and magnesium carbonate are small, and the salt content of the mother liquor is high. , it is difficult to wash, and the product purity is difficult to improve
The problem of above-mentioned technical scheme is: 1) because what pass into in the concentrated magnesium sulfite slurry is flue gas, must contain oxygen in the flue gas, and its reductive substance that is dissolved in the slurry after the acidified magnesium sulfite slurry (sulfite (hydrogen) radical ion) is more than 10 times that of conventional flue gas desulfurization conditions, and the contained magnesium sulfate (hydrogen) is basically completely oxidized to generate magnesium sulfate, which cannot achieve the purpose of reclaiming magnesium bisulfite solution; 2) Using high-purity magnesium hydroxide to neutralize magnesium bisulfite to generate high-purity magnesium sulfite, every 2 moles of high-purity magnesium sulfite needs to consume 1 mole of high-purity (hydrogen) magnesium oxide, and the raw material is high-purity (Hydroxy)magnesium oxide is extremely expensive
Although the (hydr)magnesium oxide consumed by this part can be recovered by subsequent magnesium sulfite roasting, the result is that 2 moles of magnesium sulfite are actually only finally reclaimed 1 mole of magnesium oxide, and the dehydration and roasting performance of high-purity magnesium sulfite double the cost

Method used

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  • Production method of high-purity magnesium sulfite

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: as the description attached figure 1 Shown: Magnesium sulfite waste slag (its components are: 46.7% magnesium sulfite, 39.6% moisture, solid Phase impurity 13.7%.) is added to acidification reactor A by pipeline (1), carries out acidification reaction with the sulfur dioxide gas that introduces acidification reactor A from pipeline (12), and magnesium sulfite crystal dissolves and generates magnesium bisulfite, completes The magnesium bisulfite solution after the acidification reaction enters the impurity removal filter B through the pipeline (2) to remove the solid phase impurities and then enters the heat exchanger C through the pipeline (3), and the solid impurities are discharged through the pipeline (4); In C, the magnesium bisulfite solution and the crystallization mother liquor entering the heat exchanger C from the pipeline (9) are heated to 40°C by countercurrent heat exchange, and then enter the heater D through the pipeline (5) and heat up to 50...

Embodiment 2

[0036] Embodiment 2: as the description attached figure 2 Shown: Magnesium sulfite waste slag (its components are: 46.7% magnesium sulfite, 39.6% moisture, solid Phase impurity 13.7%.) is fed into acidification reactor A by pipeline (21), carries out acidification reaction with the sulfur dioxide gas that introduces acidification reactor A from pipeline (31), and the magnesium sulfite crystal dissolves and generates magnesium bisulfite, completes The magnesium bisulfite solution of the acidification reaction enters the impurity removal filter B through the pipeline (22) to remove the solid-phase impurities and then enters the heat exchanger C through the pipeline (23), and the solid impurities are discharged through the pipeline (24); Inside, the magnesium bisulfite solution and the crystallization mother liquor that enters the heat exchanger C from the pipeline (29) exchange heat with the countercurrent partition wall and heat up to 80°C, and enter the heater D through the p...

Embodiment 3

[0039] Embodiment 3: as the description attached image 3 Shown: the magnesium sulfite slurry from the desulfurization absorption tower M is fed into the acidification reactor A through the pipeline (51), and the acidification reaction is carried out with the two streams of sulfur dioxide gas introduced into the acidification reactor A from the pipeline (58) and the pipeline (60) , magnesium sulfite crystals dissolve to generate magnesium bisulfite, and the magnesium bisulfite solution that completes the acidification reaction enters the impurity removal filter B through pipeline (52) to remove solid-phase impurities (the main impurities are calcium sulfite, silicon dioxide and soot) ) into the acidolysis reactor E through the pipeline (53), and the solid impurities are discharged through the pipeline (54); vacuum pump G is used to draw negative pressure in the acidolysis reactor E through the pipeline (57) to maintain the acidolysis reactor E The absolute pressure inside is a...

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Abstract

The invention relates to a production method of high-purity magnesium sulfite. The production method comprises the following steps: introducing sulfur dioxide gas into magnesium sulfite slurry to obtain a magnesium bisulfite solution, removing solid-phase impurities in the magnesium bisulfite solution, decomposing magnesium bisulfite into sulfur dioxide and magnesium sulfite crystals in a heatingor/and pressure reducing way, and recovering the magnesium sulfite crystals, wherein sulfur dioxide gas is reused for the acidification reaction of the magnesium sulfite slurry. Considering from the perspective of flue gas desulfurization, the method has the beneficial effects that the problems of high flue gas desulfurization cost and incapability of comprehensively utilizing desulfurization products of the existing magnesium method flue gas desulfurization are solved, mineral-grade magnesium oxide is converted into industrial-grade magnesium oxide through the desulfurization process, and value-added recycling of flue gas desulfurization is realized. Considering from the perspective of industrial-grade magnesium oxide production, the method has the beneficial effect of creating a high-purity magnesium oxide production process which is low in production cost, high in product quality and less in three-waste pollution.

Description

technical field [0001] The invention relates to the production of high-purity magnesium sulfite, in particular to the production of high-purity magnesium sulfite by using magnesium desulfurization products. Background technique [0002] Magnesium flue gas desulfurization is to prepare mineral-grade magnesium oxide (with an impurity content of about 15%) into (hydrogen) magnesium oxide slurry as a desulfurization absorbent, and remove sulfur dioxide in the flue gas through gas-liquid mass transfer to form a desulfurization product. It is a magnesium sulfite slurry, and because the flue gas contains 6%-15% of oxygen, about 10-30% of the generated primary desulfurization product magnesium sulfite slurry is oxidized to easily soluble magnesium sulfate. The early magnesium desulfurization process is to separate the desulfurization product from solid to liquid, and the liquid phase magnesium sulfate solution is discharged for comprehensive utilization, while the solid phase magnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/42C01F5/06
CPCC01F5/06C01F5/42C01P2006/80
Inventor 陆泳凯陶树宝匡勤
Owner 江苏联慧资源环境科技有限公司
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