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A method for utilizing magnesium oxide to treat SO2 exhaust gas while recovering by-products

A magnesium oxide and by-product technology, applied in chemical instruments and methods, separation methods, magnesium sulfate, etc., can solve the problems of excessive sulfate concentration, high price of desulfurization agent, waste, etc., and achieve the effect of maintaining water balance

Inactive Publication Date: 2016-04-06
青岛和合汇途工程技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the excessive concentration of sulfate radicals in wastewater and the high price of desulfurizers, the cleaning solution of traditional magnesium desulfurization is directly discharged after pressure filtration, resulting in waste
At present, the recovery method of some domestic environmental protection companies is to achieve the purpose of recovering magnesium sulfate by three-effect evaporation on the filter press liquid. The main problem of this method is that the recovery cost is too high due to the consumption of steam, and the three-effect evaporation is easy to block and difficult to operate.

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0017] The purchased magnesia powder (required magnesia content should be greater than 85%, acid insoluble matter should be less than 3% (dry basis) 90% pass 200 mesh), transport and store in the magnesia silo for subsequent use. When in use, open the screw feeder under the silo, and then open the electric slide valve, so that the magnesium oxide powder falls into the magnesium oxide pulping pool and mixes fully with water, and the magnesium oxide powder slurry is mixed evenly by the agitator. The slurry enters the distribution pool for use.

[0018] The desulfurization tower in the system is the main reaction device of the whole desulfurization project. When the desulfurization system is running, the prepared magnesium oxide slurry is sent to the desulfurization tower with a slurry pump to keep the pH value of the circulating fluid within a certain range. The gas enters from the bottom of the desulfurization tower, and the absorption liquid is sprayed down from the top of th...

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PUM

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Abstract

The invention provides a method for recovering by-products while using magnesium oxide for controlling SO2 waste gas. According to the method, the magnesium oxide is used as a fuel gas detergent, through internal recycling washing inside a desulfurization tower and the recovering of a washing liquid recovering system, by-product crystallization and the drying of a drying system, high purity MgSO4.7H2O crystal is obtained.

Description

technical field [0001] The invention relates to the field of waste gas treatment, especially to SO in waste gas 2 Remove and recover MgSO at the same time 4 ·7H 2 O's method. Background technique [0002] SO 2 Exhaust gas is mainly formed by the combustion of coal and oil. For example, coal-fired power plants, catalytic cracking units in the petrochemical industry, and smelting industries will produce a large amount of SO 2 Exhaust gas, with the increasingly stringent national environmental protection regulations, desulfurization environmental protection devices are bound to need long-term stable operation. New power plants require SO 2 The emission concentration is controlled at 100mg / Nm 3 Next, if the traditional calcium desulfurization method does not increase the construction cost of the device, it is difficult to meet the requirements. [0003] The traditional magnesium desulfurization method is to dissolve magnesium oxide in water to prepare magnesium hydroxide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50C01F5/40
Inventor 徐惊涛白长军杨子军田立宝张莎莎何雄
Owner 青岛和合汇途工程技术有限公司