Method of preparing calcium sulfate whisker by using agglomerate fume desulfurized by-products

A technology of calcium sulfate whiskers and desulfurization by-products, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., to achieve low production costs, alleviate environmental pollution, and save resources

Inactive Publication Date: 2011-04-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the utilization of sinter flue gas desulfurization by-products at present, the present invention provides a method for preparing calcium sulfate

Method used

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  • Method of preparing calcium sulfate whisker by using agglomerate fume desulfurized by-products
  • Method of preparing calcium sulfate whisker by using agglomerate fume desulfurized by-products

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] The process steps of the method for preparing calcium sulfate whiskers by utilizing sintered ore flue gas desulfurization by-products are as follows:

[0026] (1) Sizing

[0027] According to the ratio of solid-liquid volume ratio of 1:12, the by-product of sintered ore flue gas desulfurization is mixed with water to obtain a suspension.

[0028] (2) High temperature oxidation

[0029] Add oxidant and inhibitor to the suspension obtained in step (1), adjust the pH value to 6, stir, and control the stirring speed to 95 rev / min, and keep the temperature at 200 ° C and the pressure at 5 MPa for 270 min. carry out an oxidation reaction.

[0030] The oxidant used is oxygen; the inhibitor used is sodium phosphate; by mass percentage, the amount of the oxidant added is 5% of the mass of the suspension, and the amount of the inhibitor is 5% of the mass of the suspension.

[0031] (3) Filtration and washing

[0032] The high-temperature oxidized material...

Example Embodiment

[0039] Example 2

[0040] The process steps of the method for preparing calcium sulfate whiskers by utilizing sintered ore flue gas desulfurization by-products are as follows:

[0041] (1) Sizing

[0042] According to the ratio of solid-liquid volume ratio of 1:20, the by-product of sintered ore flue gas desulfurization is mixed with water to obtain a suspension.

[0043] (2) High temperature oxidation

[0044] Add oxidant and inhibitor to the suspension obtained in step (1), adjust the pH value to 10, stir, and control the stirring speed to 150 rpm, and keep the temperature at 300 ° C and the pressure at 10 MPa for 40 min. carry out an oxidation reaction.

[0045]The oxidant used was sodium hypochlorite; the inhibitor used was nitric acid, and the mass concentration of nitric acid was 1.5%; by mass percentage, the amount of the oxidant added was 10% of the mass of the suspension, and the amount of the inhibitor was 10% of the mass of the suspension.

[0046] (3) Filtrat...

Example Embodiment

[0054] Example 3

[0055] The process steps of the method for preparing calcium sulfate whiskers by utilizing sintered ore flue gas desulfurization by-products are as follows:

[0056] (1) Sizing

[0057] According to the ratio of solid-liquid volume ratio of 1:4, the by-product of sintered ore flue gas desulfurization is mixed with water to obtain a suspension.

[0058] (2) High temperature oxidation

[0059] Add oxidant and inhibitor to the suspension obtained in step (1), adjust the pH value to 2, stir, and control the stirring speed to 40 rpm, and keep the temperature at 110 ° C and the pressure at 0.2 MPa for 500 min. , the oxidation reaction takes place.

[0060] The oxidant used was potassium hypochlorite; the inhibitor used was magnesium phosphate; by mass percentage, the amount of the oxidant added was 0.5% of the mass of the suspension, and the amount of the inhibitor was 0.5% of the mass of the suspension.

[0061] (3) Filtration and washing

[0062] The high...

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Abstract

The invention relates to a method of preparing calcium sulfate whiskers by using agglomerate fume desulfurized by-products. The method comprises the following steps: firstly, carry out size mixing: adding an oxidizer and an inhibitor to a suspension solution and reacting at 110 to 300 DEG C and 0.2 to 10 MPa; and then filtering, washing, drying and coating. The density of the prepared calcium sulfate whisker is from 2.0 to 2.3 g/cm<3>, the loose density is from 0.1 to 0.6 g/cm<3>, the length is from 10 to 300 mu m, the diameter is from 120 nm to 3 mu m, the melting point is from 1400 to 1500 DEG C, the tensile strength is from 14 to 20 GPa, the tensional modulus is from 150 to 180 GPa, the refractive index is from 1.3 to 1.6, and the water solubility (22 DEG C) is not more than 0.1%. Because the agglomerate fume desulfurized by-products are used as raw materials for preparing the calcium sulfate whiskers, the invention has the advantages that environment pollution caused by the agglomerate fume desulfurized by-products is reduced, and natural gypsum sources can be saved, thus providing a new way for high additional value utilization of the agglomerate fume desulfurized by-products.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, relates to flue gas control and solid waste treatment technologies, and in particular relates to a method for preparing calcium sulfate whiskers by utilizing by-products of sinter flue gas desulfurization. Background technique [0002] With the continuous and rapid development of my country's iron and steel industry, the environmental pollution problems are very prominent, especially the discharge of "three wastes" has attracted great attention from the country. SO 2 As one of the important contents, the emission control of the iron and steel industry is mandatory to achieve emission reductions and flue gas emission standards within a time limit. In my country's iron and steel enterprises, SO 2 The emissions are second only to the emissions from the power industry and industrial boilers, ranking third, while the SO emissions from iron and steel enterprises 2 50%~70% of the gas ...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B29/62C01F11/46
Inventor 史培阳姜茂发刘承军闵义孙丽枫王德永
Owner NORTHEASTERN UNIV
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