Method for preparing desulfurized gypsum

A technology of desulfurization gypsum and desulfurization slurry, which is applied in the field of flue gas desulfurization, and can solve problems such as affecting vacuum filtration, high viscosity, and inclusions

Inactive Publication Date: 2012-05-02
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, these impurities will affect the crystallization and growth of gypsum, resulting in fine grains of desulfurized gypsum, which is not conducive to the dehydration of gypsum; on the other hand, these impurities often have low density and high viscosity. When suction filtration is carried out, impurities form a layer of brown covering on the surface, which affects vacuum filtration; at the same time, some impurities are mixed between gypsum crystal grains, blocking the passage of free water between gypsum crystals, making it difficult to dehydrate gypsum ; In addition, higher impurity content will reduce the purity of desulfurized gypsum
[0006] 3. The solid content of the gypsum slurry sent to the dehydration equipment, if the solid content of the gypsum slurry is too low, the water content of the slurry will be relatively high, which will increase the load of the dehydration equipment, resulting in a high moisture content of the gypsum filter cake

Method used

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  • Method for preparing desulfurized gypsum

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Effect test

Embodiment 1

[0026] use as figure 1 In the process shown, the desulfurization system is a limestone-gypsum desulfurization system. Sodium dodecylbenzenesulfonate is added to the desulfurization slurry. After the addition, the concentration of sodium dodecylbenzenesulfonate in the slurry is 0.03g / L. The density of the slurry at the bottom of the separation tank is 1.21g / ml, and the vacuum belt filter is used for suction filtration. The obtained desulfurization gypsum filter cake has a moisture content of 10.8% and a gypsum purity of 94%.

Embodiment 2

[0028] use as figure 1 In the process shown, the desulfurization system is a limestone-gypsum desulfurization system. Sodium dodecylbenzenesulfonate is added to the desulfurization slurry. After the addition, the concentration of sodium dodecylbenzenesulfonate in the slurry is 0.05g / L. The density of the slurry at the bottom of the separation tank is 1.15g / ml, and the vacuum belt filter is used for suction filtration. The obtained desulfurization gypsum filter cake has a moisture content of 10.4% and a gypsum purity of 96%.

Embodiment 3

[0030] use as figure 1 In the process shown, the desulfurization system is calcium carbide slag-gypsum desulfurization system. Sodium lauryl sulfate is added to the desulfurization slurry. min, the density of the gypsum slurry at the bottom of the separation tank was 1.24g / ml, and a vacuum belt filter was used for suction filtration. The obtained desulfurized gypsum filter cake had a moisture content of 9.8% and a gypsum purity of 97%.

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Abstract

The invention discloses a method for preparing desulfurized gypsum, belonging to the technical field of flue gas desulfurization. The method comprises the following steps: taking desulfurizing slurry generated by flue gas wet desulfurization, adding a crystal grain increase agent into the desulfurizing slurry to carry out oxidization, separating out impurities, and dehydrating to obtain the desulfurized gypsum, wherein the crystal grain increase agent is at least one of surfactant, flocculant and inorganic salts. The method disclosed by the invention can greatly lower the water content of the desulfurized gypsum and enhance the purity of the desulfurized gypsum, thereby enhancing the quality of the desulfurized gypsum.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a method for preparing desulfurized gypsum. Background technique [0002] Wet desulfurization process is currently the most widely used and most mature flue gas desulfurization technology, accounting for about 90% of the installed capacity of flue gas desulfurization (FGD) thermal power units. The wet desulfurization process includes limestone-gypsum method, white mud, carbide slag-gypsum method and other alkaline waste desulfurization processes, and the by-product of desulfurization is desulfurization gypsum. The main component of desulfurized gypsum is calcium sulfate dihydrate, which can be widely used in the preparation of cement, gypsum board, gypsum blocks and other construction products. Generally speaking, the resource utilization of desulfurized gypsum requires that the gypsum produced by the desulfurization system meet the conditions of moisture conten...

Claims

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Application Information

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IPC IPC(8): C04B11/26
Inventor 盛海强莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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