Method for preparing high-purity calcium nitrate by desulfurization and denitrification byproducts

A technology for desulfurization, denitrification, and by-products, applied in the direction of calcium/strontium/barium nitrate, etc., can solve the problem of low utilization rate of desulfurization and denitrification by-products, and achieve the effect of solving subsequent processing problems and safe and reliable process flow

Active Publication Date: 2019-01-01
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is no further treatment method for the desulfurization and denitrification by-products in the prior art, resulting in a low utilization rate of the desulfurization and denitrification by-products

Method used

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  • Method for preparing high-purity calcium nitrate by desulfurization and denitrification byproducts

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Embodiment 1

[0028] The present embodiment provides a kind of method that prepares high-purity calcium nitrate with desulfurization and denitrification by-product, and it comprises the following steps:

[0029] Step S1, premixing the desulfurization and denitrification by-products and water according to a certain ratio to obtain a premixed solution; stirring the premixed solution, adding a certain amount of oxidant during the stirring process; after stirring, standing still for a certain period of time to obtain a mixed solution; Filtrating the mixed solution for solid-liquid separation to produce a first filtrate and a first solid component; filtering the first filtrate to produce a first residue and a second filtrate; combining the first residue with the first solid component, and the second Filtrate enters step S2;

[0030] Perform mechanical pressure filtration on the first solid component, collect and reuse the pressure filter cake, and then filter the press filtrate obtained after pr...

Embodiment 2

[0057] This embodiment provides a method for preparing high-purity calcium nitrate with desulfurization and denitrification by-products, which includes:

[0058] Water and desulfurization and denitrification by-products are premixed at a mass ratio of 1:1, the temperature of the premixed solution is 40°C, and the pH value of the premixed solution is not adjusted. The oxidant used is ozone gas, the ozone concentration is 10%, and the mass ratio of desulfurization and denitrification by-products to pure ozone is 100, and the ozone concentration is converted to ozone volume. Stir for 45 minutes at a stirring speed of 200 r / min. During the stirring process, ozone is continuously injected in proportion by air blast.

[0059] After the mixing and stirring, solid-liquid separation is performed; a first filtrate and a first solid component are produced; the first filtrate is filtered to produce a first residue and a second filtrate; the first residue is combined with the first solid c...

Embodiment 3

[0064] This embodiment provides a method for preparing high-purity calcium nitrate with desulfurization and denitrification by-products, which includes:

[0065] Water and desulfurization and denitrification by-products are premixed at a mass ratio of 2:1, the temperature of the premixed solution is 60°C, and the pH of the mixed solution is adjusted to 3 with nitric acid solution. The oxidizing agent used is hydrogen peroxide, the concentration of hydrogen peroxide is 25%, and the mass ratio of desulfurization and denitrification by-products to hydrogen peroxide is 150 for mixing. Stir for 40 minutes at a stirring speed of 250 r / min, and add hydrogen peroxide to the premixed solution at one time.

[0066] After the mixing and stirring, solid-liquid separation is performed; a first filtrate and a first solid component are produced; the first filtrate is filtered to produce a first residue and a second filtrate; the first residue is combined with the first solid component.

[0...

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Abstract

The invention discloses a method for preparing high-purity calcium nitrate by desulfurization and denitrification byproducts. The method comprises the following steps: S1, mixing the desulfurization and denitrification byproducts, water and an antioxidant according to a certain ratio, and performing solid-liquid separation on a mixed solution; S2, mixing a second filtrate and a third filtrate in S1, evaporating, concentrating, cooling, crystallizing and drying; S3, mixing and stirring an obtained crystallizing solid in S2 and an organic solvent, and performing solid-liquid separation to produce a second solid component and an organic solvent filtrate; performing reduced pressure distillation on the organic solvent filtrate, wherein the organic solvent is recycled, and a crystallizing product is the high-purity calcium nitrate solid. The method for preparing the high-purity calcium nitrate by the desulfurization and denitrification byproducts has the advantages that by using the desulfurization and denitrification byproducts as the raw materials, the high-purity calcium nitrate is prepared by stepped extracting and oxidizing; the raw materials are easy to obtain, the corresponding technological process is safe and reliable, and the problem of subsequent treatment difficulty of the desulfurization and denitrification byproducts is solved.

Description

technical field [0001] The invention relates to a method for preparing high-purity calcium nitrate by using desulfurization and denitrification by-products, and belongs to the technical field of environmental protection. Background technique [0002] Flue gas, especially coal-fired boiler flue gas, steelmaking flue gas, and thermal power generation, are one of the main sources of air pollutants, and have become the key objects of environmental governance. At present, there are many developments in flue gas desulfurization and denitrification technologies. Different processes have different desulfurization and denitrification efficiencies, and the corresponding desulfurization and denitrification products are different. [0003] In the existing technology, desulfurization and denitrification technology can use semi-dry absorption tower desulfurization coupled with ozone oxidation denitrification process to convert sulfur oxides and nitrogen oxides in flue gas into calcium sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/38
CPCC01F11/38C01P2006/80
Inventor 李寅明熊运贵
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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