Method for producing magnesium sulfate heptahydrate by using desulfurization wastewater

A technology of magnesium sulfate heptahydrate and desulfurization waste liquid, applied in the direction of magnesium sulfate, etc., can solve the problems of high cost, large resource consumption, high operation and maintenance costs, and achieve the effect of stable operation

Active Publication Date: 2012-10-24
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 operatio

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0062] Example 1

[0063] (1) Preparation of desulfurizer:

[0064] Mix the components uniformly according to the following formula to obtain a desulfurizer.

[0065]

[0066] (2) Process for producing magnesium sulfate using desulfurization waste liquid

[0067] 1. Pulping:

[0068] The prepared desulfurizer powder is mixed with water to make a slurry and matured to form a slurry containing magnesium hydroxide (referred to as slurry containing magnesium hydroxide), which is left 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 SO in the flue gas 2 .

[0071] In the desulfurization tower, the slurry containing magnesium hydroxide contains strong oxidizer MnO 2 , The slurry in the tower is about to generate a solution of 95wt% magnesium sulfate and 5wt% magnesium sulfite at the moment of the desulfurization reaction. The above p...

Example Embodiment

[0082] Example 2

[0083] In addition to adding 5 parts by weight of KMO to the desulfurizer 4 , 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 as 100wt%), other conditions are the same as in Example 1. . The properties of the obtained products are shown in Table 2, and the experimental data are shown in Table 3.

Example Embodiment

[0084] Example 3

[0085] In addition to changing the weight of magnesium oxide in the desulfurizing agent to 80 weight parts, the desulfurizing slurry is generated into a solution of 90 wt% magnesium sulfate and 10 wt% magnesium sulfite (the percentages are based on the weight percentage of magnesium sulfate and magnesium sulfite Except that the sum is 100% by weight), 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.

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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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IPC IPC(8): C01F5/40
Inventor 童裳慧刘景明
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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