A method for separating and purifying desulfurized gypsum and a device for realizing the method

A technology of desulfurization gypsum and desulfurization slurry, applied in the direction of solid separation, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve the problems of poor dehydration effect of desulfurization gypsum, low grade of desulfurization gypsum, and improve resource utilization , Improve the grade and improve the effect of purity

Inactive Publication Date: 2017-09-29
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the technical problem that the existence of black colloidal impurities in the existing desulfurized gypsum slurry leads to poor dehydration effect of desulfurized gypsum, which in turn leads to low grade of desulfurized gypsum

Method used

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  • A method for separating and purifying desulfurized gypsum and a device for realizing the method
  • A method for separating and purifying desulfurized gypsum and a device for realizing the method
  • A method for separating and purifying desulfurized gypsum and a device for realizing the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for separating and purifying desulfurized gypsum, comprising the step of removing black impurities by adding an alcohol foaming agent and a hydrophobic collector to the desulfurized gypsum slurry in a stirring state.

[0038] The added amount of the alcohol foaming agent is preferably 0.02%-0.05% of the mass of the desulfurized gypsum slurry. More preferably, it is 0.03%.

[0039] The added amount of the hydrophobic collector is preferably 0.1%-0.5% of the mass of the desulfurized gypsum slurry. Preferably it is 0.1%-0.3%. More preferably 0.2%.

[0040] The alcohol foaming agent is preferably an alcohol with 6-10 carbon atoms. Alcohols with 8 carbon atoms are more preferably used, for example, sec-octanol.

[0041] The hydrophobic collector is preferably light diesel oil.

[0042] The adding method of the alcohol foaming agent and the hydrophobic trapping agent is not limited, as long as they can be added and well dispersed.

[0043] In order to better re...

Embodiment 2

[0048] This embodiment 2 is a specific device for realizing the method for separating and purifying desulfurized gypsum in the above embodiment 1, such as image 3 As shown, it includes a desulfurization slurry pool 1 and an oxidation air delivery pipeline 2, and the air outlet 21 of the oxidation air delivery pipeline 2 (multiple openings are provided to ensure that the oxidation air in the input slurry is evenly dispersed) communicates with the desulfurization slurry pool 1; Wherein, it also includes a collector injection unit 3 and a foaming agent injection unit 4, the liquid outlet of the collector injection unit 3 communicates with the desulfurization slurry pool 1; the liquid outlet of the foaming agent injection unit 4 The port communicates with the oxidizing air delivery pipe.

[0049] Wherein, the desulfurization slurry tank 1 is also equipped with a stirrer 11 for stirring the desulfurization gypsum slurry therein. The desulfurization slurry pool 1 is also connected...

Embodiment 3

[0056] In Example 3, white mud produced in the production process of a paper mill in Shandong Province was used as calcium-based solid waste to desulfurize the flue gas of a coal-fired experimental boiler, and white mud desulfurized gypsum was used as the experimental object. The specific experimental process is as follows:

[0057] The white mud desulfurization gypsum separation device test was carried out on the flue gas desulfurization device of the 2t / h coal-fired experimental boiler. The white mud comes from a paper mill in Shandong Province. The size of the boiler desulfurization slurry pool is 1500mm×1000mm×1200mm. The rotation speed is 30rpm, and the density of desulfurization slurry is 1012kg / m 3 . like Figure 4 shown.

[0058] Second-octanol is used as a foaming agent, and the amount of secondary-octanol is 0.03% of the amount of slurry, injected into the oxidation air delivery pipeline 2 through the foaming agent injection unit 4, and dispersed into the desulfur...

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Abstract

The invention provides a separation and purification method of desulfurized gypsum and the implementation thereof to upgrade the quality of the desulfurized gypsum. The method is to add alcoholic foaming agent and hydrophobic collector into the desulfurized gypsum slurry in the stirring condition. The equipment for the implementation comprises the collector injection unit and the foaming agent injection unit. The outlet of the collector injection unit is connected to the desulfurized slurry pond; the outlet of the foaming agent injection unit is connected to the oxidized air transmission pipe. The invention applies the principle of dissolved air floating, combines the black gel debris and hydrophobic collector, and combines the hydrophobic base of the foam generated by the foaming agent and the hydrophobic base on the surface of the black gel debris, wherein the bubble takes the black debris to the liquid top layer to make the black debris detached from the desulfurized gypsum slurry. The removal rate of the black gel debris is higher than 90%, which guarantees the dehydration effects of the desulfurized gypsum slurry and enhances the purity and whiteness of the desulfurized gypsum and improves the quality of the desulfurized gypsum.

Description

technical field [0001] The invention relates to the technical field of separation and purification of flue gas desulfurization gypsum, in particular to a method for separation and purification of desulfurization gypsum and a device for realizing the method. Background technique [0002] my country produces about 15 million tons of white mud for papermaking every year, and about 30 million tons of power plant slag every year. In addition, the chlor-alkali and caustic soda industries also produce more than 400,000 tons of salt mud every year. The main component of these solid wastes is calcium carbonate, and most of them are disposed of in landfills. Calcium-based solid wastes such as lime mud contain soluble salts, causing serious secondary pollution to soil and groundwater, posing a serious threat to the ecological environment, and becoming a difficult point in industrial solid waste control. [0003] At present, the application methods of calcium-based solid waste at home ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/00B03D1/14C01F11/46
CPCC01F11/468C01P2004/01C01P2006/80
Inventor 王凡田刚张凡王相凤朱金伟王洪昌刘宇
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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