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Magnesium sulfate production method using magnesium oxide and desulfurated waste fluid

A technology for desulfurization waste liquid, magnesium sulfate, applied in magnesium sulfate, chemical instruments and methods, separation methods, etc., can solve the problems of difficult separation of calcium sulfate particles and magnesium hydroxide, low calcium sulfate products, difficult practical operation, etc. The effect of excellent energy consumption and quality indicators, small evaporation, and significant social benefits

Inactive Publication Date: 2004-11-10
天津市昌昊化工股份合作公司
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Problems solved by technology

[0004] However, this process obviously inherits some shortcomings of calcium oxide desulfurization equipment, such as a large amount of calcium oxide is consumed, and the by-product is still low-value calcium sulfate products. Magnesium oxide is only used as a desulfurization carrier.
A more important problem is that the calcium sulfate particles and magnesium hydroxide produced by the double decomposition process are difficult to separate, and the actual operation is very difficult.

Method used

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  • Magnesium sulfate production method using magnesium oxide and desulfurated waste fluid
  • Magnesium sulfate production method using magnesium oxide and desulfurated waste fluid
  • Magnesium sulfate production method using magnesium oxide and desulfurated waste fluid

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Embodiment 1

[0029] ① Oxidation: Take 2000g of magnesium oxide desulfurization waste liquid containing 20% ​​magnesium sulfite (prepared by magnesium sulfite reagent) and put it into a beaker with stirring, heat to 35°C, blow air in for 30 minutes, take a sample and analyze magnesium sulfate It reaches 22.2%, and the oxidation rate reaches 99%. The pH value of the solution is 6-7, and the process of neutralization and impurity removal is omitted.

[0030] ② Evaporation concentration and separation: Put 2055g of the above solution on the electric furnace and heat it while stirring. Continue at 125°C for 10 minutes, lose 1040g of water, stop heating, let it stand for 2 minutes, quickly pour the supernatant liquid into another beaker, take The lower floor slurry is filtered and dried with a filter cloth bag to obtain 366g of wet magnesium sulfate monohydrate, and the mother liquor and supernatant liquid thrown out are poured into the same beaker.

[0031] ③Drying: disperse 360g of wet magnes...

Embodiment 2

[0034] ① Take 1000 grams of waste liquid containing 25% magnesium sulfite produced by the magnesium oxide wet desulfurization process, feed air into it for 30 minutes, then add 8 grams of 50% magnesium hydroxide emulsion, stir for 30 minutes, and the pH Be 7, filter then, obtain 3 gram filter cakes, 1028 gram supernatants. Prepare two more supernatants in the same way.

[0035] 2. Put 1028 grams of clear liquid above into a beaker, evaporate at a temperature of 120° C., remove 300 grams of water, settle for 20 hours, pour out 400 grams of clear liquid to obtain 328 grams of magnesium sulfate slurry.

[0036] ③Get 1028 grams of clear liquid again, add 328 grams of magnesium sulfate slurry obtained above, stir for 4 hours at 25°C, then filter to obtain 300 grams of wet magnesium sulfate heptahydrate, obtain 1056 grams of filtrate, and pass through 50 grams of wet magnesium sulfate heptahydrate. ℃ hot air drying to obtain 290 grams of dry magnesium sulfate heptahydrate.

[0037...

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Abstract

The invention provides a process for preparing magnesium sulphate by utilizing magnesium oxide desulfurized exhausted liquid comprising the steps of oxidation step, neutralization step, edulcoration step, evaporation concentration, solid-liquid separation step, drying and packing step. By controlling different evaporation temperature, discharging condition and various equipment, kieserite and magnesium sulphate can be prepared respectively.

Description

technical field [0001] The invention relates to a method for recycling by-product waste liquid resources in a flue gas wet magnesium oxide desulfurization process, and in particular provides a method for producing magnesium sulfate by using magnesium oxide desulfurization waste liquid. Background technique [0002] In recent years, in the flue gas desulfurization process, magnesium oxide has been widely promoted as a desulfurizer, and it has a tendency to replace calcium oxide desulfurizer. Low, good desulfurization effect, by-product waste liquid can be used for resource recovery. However, during the actual operation of the magnesium oxide desulfurization plant, the by-product waste liquid with magnesium sulfite as the main component has to be discharged because there is no economical treatment method, resulting in waste of resources and secondary pollution of the environment. [0003] Some foreign magnesia desulfurization devices, mainly in Japan, have adopted a double de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/48C01F5/40C02F1/00
Inventor 李臻牛自得
Owner 天津市昌昊化工股份合作公司
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