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Magnesium desulfurization byproduct recovery process

A technology for desulfurization and by-products by magnesium method, applied in magnesium sulfate, separation methods, chemical instruments and methods, etc., can solve the problems of unguaranteed product quality, high impurity content in slurry, high chloride ion accumulation, and achieve unit steam consumption. Low, reduce impurity content, good filtering effect

Inactive Publication Date: 2012-12-05
CHINA PETROLEUM & CHEM CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, the existing devices all have the following disadvantages: 1, the impurity content of the slurry is high, and the product quality cannot be guaranteed
2. The use of steam to evaporate concentrated slurry requires a large amount of steam consumption, and the operating cost is high, which reduces the enthusiasm of enterprises to use it.
3. The accumulation of chloride ions is high, and the corrosion of equipment is extremely serious

Method used

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  • Magnesium desulfurization byproduct recovery process
  • Magnesium desulfurization byproduct recovery process
  • Magnesium desulfurization byproduct recovery process

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Embodiment Construction

[0041]"Ranges" are disclosed herein in terms of lower limits and upper limits. There can be one or more lower bounds, and one or more upper bounds, respectively. A given range is defined by selecting a lower limit and an upper limit. Selected lower and upper limits define the boundaries of a particular range. All ranges that may be defined in this manner are inclusive and combinable, ie, any lower limit may be combined with any upper limit to form a range. For example, ranges of 60-120 and 80-110 are listed for a particular parameter, with the understanding that ranges of 60-110 and 80-120 are contemplated. Additionally, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4, and 5 are listed, the following ranges are all expected: 1-3, 1-4, 1-5, 2- 3, 2-4, and 2-5.

[0042] In the present invention, unless otherwise stated, the content ranges and preferred ranges of each component of the composition can be combined with each other to form...

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Abstract

The invention relates to a magnesium desulfurization byproduct recovery process, and provides a magnesium desulfurization byproduct recovery method. The method comprises the following steps: (1) carrying out oxidation in a desulfurization tower: introducing air to the desulfurization tower air and stirring, such that magnesium sulfite in a slurry is completely oxidized into magnesium sulfate; (2) increasing magnesium sulfate concentration in the desulfurization tower: controlling a water supply amount and a slurry discharge amount of the desulfurization tower, and adopting heat of flue gas in the desulfurization tower to carry out concentration on the desulfurized slurry so as to increase the magnesium sulfate concentration in the slurry to 30-35 wt%; (3) removing impurities: conveying the slurry from the step (2) to an expansion drum type filter to remove impurities; and (4) carrying out evaporation crystallization: conveying the filtrate from the step (3) into a two effect falling film evaporator to carry out evaporation crystallization to obtain a magnesium sulfate heptahydrate crystal.

Description

technical field [0001] The application relates to a process for recovering magnesium desulfurization by-products, more specifically to a process for generating magnesium sulfate heptahydrate from magnesium desulfurization by-products. Background technique [0002] In recent years, a large number of magnesium-based flue gas desulfurization devices have been built in China. These devices use my country's abundant magnesium resources to remove sulfur dioxide from the flue gas emitted by coal-fired boilers, and realize the discharge of sulfur dioxide in the flue gas of coal-fired boilers. However, the desulfurization by-products produced by these desulfurization devices have basically not been effectively treated, and most of the desulfurization by-products are discarded as waste residues. This practice does not make full use of precious magnesium resources, but poses a potential threat to the environment. . With the implementation of the national "energy saving and emission re...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50C01F5/40
Inventor 陈昕梁亮仝明严奇伟周洪义
Owner CHINA PETROLEUM & CHEM CORP
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