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Method for producing magnesium sulfate heptahydrate by using desulfurization wastewater

A technology of magnesium sulfate heptahydrate and desulfurization waste liquid, applied in magnesium sulfate and other directions, can solve the problems of high cost, high operation and maintenance cost, complicated operation, etc., and achieve the effect of stable operation

Active Publication Date: 2014-06-18
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of process needs to neutralize the magnesium sulfate and sulfuric acid mixture by adding magnesium hydroxide emulsion at the back end. As a result of the reaction of each component in the neutralization process, the existing process cannot be accurately controlled, resulting in the production of by-products that cannot guarantee the purity and content. , scale production is limited
Moreover, the evaporative crystallization process itself consumes a lot of resources, and the cost is high
In addition, from the operation situation, the evaporation and crystallization process is very easy to form particle blockage in the pipeline, the operation is complicated, and the operation and maintenance cost is high.
In addition, the forced oxidation process needs to be operated through an aeration system. Under the influence of factors such as aeration time, oxygen supply, and temperature, it cannot ensure that the effective components in the slurry are transformed into a mixture of magnesium sulfate and magnesium sulfite with a concentration of more than 90%.

Method used

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  • Method for producing magnesium sulfate heptahydrate by using desulfurization wastewater
  • Method for producing magnesium sulfate heptahydrate by using desulfurization wastewater
  • Method for producing magnesium sulfate heptahydrate by using desulfurization wastewater

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Experimental program
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Effect test

Embodiment 1

[0063] (1) Modulation of desulfurizer:

[0064] According to the following formula, mix each component evenly to obtain a desulfurizing agent.

[0065]

[0066] (2) The process of using desulfurization waste liquid to produce magnesium sulfate

[0067] 1. Pulping:

[0068] Add water to the prepared desulfurizer powder, make slurry, and mature to form a slurry containing magnesium hydroxide (abbreviated as slurry containing magnesium hydroxide), and keep it in the slurry tank for later use.

[0069] 2. Desulfurization and oxidation:

[0070] The sulfur dioxide in the flue gas reacts with the slurry containing magnesium hydroxide in the desulfurization tower to remove the SO in the flue gas 2 .

[0071] In the desulfurization tower, the slurry containing magnesium hydroxide contains strong oxidant MnO 2 Make the slurry in the tower generate a solution of 95wt% magnesium sulfate and 5wt% magnesium sulfite from the desulfurization slurry at the moment when the desulfurizat...

Embodiment 2

[0083] In addition to adding 5 parts by weight of KMO to the desulfurizer 4 , except that the desulfurization slurry is generated into a solution of 97wt% magnesium sulfate and 3wt% magnesium sulfite (the percentages are based on the sum of the weight percentages of magnesium sulfate and magnesium sulfite being 100wt%), other conditions are the same as in Example 1 . The properties of the obtained product are shown in Table 2, and the experimental data are shown in Table 3.

Embodiment 3

[0085] Except that the weight part of magnesium oxide is changed to 80 parts by weight in the desulfurizer, the desulfurization slurry is generated into a solution of 90wt% magnesium sulfate and 10wt% magnesium sulfite (the percentages are based on the percentage by weight of magnesium sulfate and magnesium sulfite) and are 100wt% meter), other conditions are identical with embodiment 1. The properties of the obtained product are shown in Table 2, and the experimental data are shown in Table 3.

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Abstract

The present invention discloses a method for producing magnesium sulfate heptahydrate by using desulfurization wastewater. The method comprises the following steps: (1) pulping, (2) carrying out desulfurization, (3) discharging the pulp, (4) filtering, (5) carrying out concentration, and (6) carrying out crystallization. With the method of the present invention, high value byproducts can be synchronously produced during a flue gas desulfurization process by using a magnesium oxide method. In addition, with the method of the present invention, a stable running characteristic is provided, and quality of the produced magnesium sulfate heptahydrate after desulfurization reaches standards.

Description

technical field [0001] The invention relates to a method for producing magnesium sulfate by utilizing desulfurization waste liquid, especially a method for producing magnesium sulfate heptahydrate by utilizing desulfurization waste liquid. Background technique [0002] Since 2005, in the flue gas sulfur process, the magnesia desulfurization technology has been widely recognized by iron and steel and power generation enterprises. This is inseparable from the advantages of the magnesia desulfurization technology. It is generally believed that the magnesia method has high desulfurization efficiency ( It can reach more than 90%), less initial investment, and low operation and maintenance costs. In areas with magnesium ore resources, it is a competitive desulfurization technology. At present, most enterprises use magnesium oxide for flue gas desulfurization, and the treatment methods of magnesium sulfate and magnesium sulfite waste liquid produced by desulfurization are mainly d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40
Inventor 童裳慧刘景明
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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