Method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of coal-fired power plant

A technology for magnesium hydroxide and desulfurization wastewater, applied in magnesium hydroxide, chemical instruments and methods, filtration treatment, etc., can solve the problems of low product purity, high cost of desulfurization wastewater treatment technology, complicated product separation process, etc., and achieve high purity. , Improve the level of environmental protection technology, the effect of short process flow

Inactive Publication Date: 2020-12-04
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing magnesium hydroxide and calcium chloride from desulfurization wastewater in coal-fired power plants, and to solve technical problems such as high cost of existing desulfurization wastewater treatment technology, complicated process of impurity removal and product separation, and low product purity.

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  • Method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of coal-fired power plant
  • Method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of coal-fired power plant
  • Method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of coal-fired power plant

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Embodiment Construction

[0024] In order to make the technical means, innovative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below.

[0025] The examples described here are specific specific implementations of the present invention, and are used to illustrate the concept of the present invention. They are all explanatory and exemplary, and should not be construed as limiting the implementation of the present invention and the scope of the present invention. In addition to the embodiments described here, those skilled in the art can also adopt other obvious technical solutions based on the claims of the application and the contents disclosed in the description, and these technical solutions include adopting any obvious changes made to the embodiments described here. Replacement and modified technical solutions.

[0026] A method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewa...

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Abstract

The invention discloses a method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of a coal-fired power plant. The method comprises the following steps: step 1, performing neutralization pretreatment; 2, reacting and synthesizing magnesium hydroxide; 3, performing filter pressing, washing and drying on magnesium hydroxide; step 4, drying calcium chloride. Aiming at the characteristic of high concentration of magnesium, calcium, sulfate radicals and chloride ions in the desulfurization concentrated wastewater of the coal-fired power plant, slaked lime is added into the desulfurization concentrated wastewater for neutralization pretreatment, impurities such as sulfate radicals and heavy metals are removed, magnesium hydroxide and calcium chlorideare synthesized by utilizing a chemical reaction of magnesium ions and lime milk, and finally, separation and drying are performed, magnesium hydroxide solid and calcium chloride solid are recycled, and waste water resource recycling is achieved while the problem of waste water pollution is solved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of a coal-fired power plant. Background technique [0002] The wide application of limestone wet desulfurization technology in coal-fired power plants has led to an increasing amount of wet desulfurization by-products - desulfurization wastewater. Excessive concentration endangers the stable operation of the system. At present, research at home and abroad is mainly focused on the treatment technology of desulfurization wastewater, but due to the consideration of factors such as cost and market, the attention of desulfurization wastewater recycling technology has gradually weakened. However, a large amount of elements in desulfurization wastewater is a potential resource. Removing and separating chlorine, magnesium, calcium and other ions can realize "zero discharge" of desul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C01F5/22C01F11/24C01F11/30C01F11/32C02F9/04C02F101/10C02F101/12C02F101/20C02F103/18
CPCC01F5/14C01F5/145C01F5/22C01F11/24C01F11/30C01F11/32C02F1/001C02F1/66C02F2101/10C02F2101/101C02F2101/12C02F2101/20C02F2103/18
Inventor 李雅轩姚宣路光杰陈鸥杨建辉段威高健江清潘
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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