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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 whiskers by using sinter flue gas desulfurization by-products, so as to reduce the pollution of solid waste to the environment and rationally utilize desulfurization by-products Purpose

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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Embodiment 1

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

[0026] (1) Blending

[0027] Mix the by-products of flue gas desulfurization of sintering ore with water at a solid-to-liquid volume ratio of 1:12 to obtain a suspension.

[0028] (2) High temperature oxidation

[0029] Add oxidants and inhibitors to the suspension prepared in step (1), adjust the pH value to 6, stir, the stirring speed is controlled at 95 rpm, and under the conditions of temperature 200 ° C and pressure 5 MPa, keep warm for 270 min, carry out the oxidation reaction.

[0030] The oxidant used is oxygen; the inhibitor used is sodium phosphate; in terms of mass percentage, the amount of 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] Vacuum suction filtration is performed on the material after...

Embodiment 2

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

[0041] (1) Blending

[0042] Mix the by-products of flue gas desulfurization of sintered ore with water at a solid-to-liquid volume ratio of 1:20 to obtain a suspension.

[0043] (2) High temperature oxidation

[0044] Add oxidants and inhibitors to the suspension prepared in step (1), adjust the pH value to 10, stir, and control the stirring speed to 150 rpm, and keep it warm for 40 minutes at a temperature of 300 °C and a pressure of 10 MPa. carry out the oxidation reaction.

[0045]The oxidant that adopts is sodium hypochlorite; The inhibitor that adopts is nitric acid, and the mass concentration of nitric acid is 1.5%; By mass percentage, the addition of oxidant is 10% of suspension quality, and the consumption of inhibitor is 10% of suspension quality.

[0046] (3) Filtration and washing

[0047] The material after hi...

Embodiment 3

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

[0056] (1) Blending

[0057] Mix the by-products of sinter flue gas desulfurization with water at a solid-to-liquid volume ratio of 1:4 to obtain a suspension.

[0058] (2) High temperature oxidation

[0059] Add oxidants and inhibitors to the suspension prepared in step (1), adjust the pH value to 2, stir, and control the stirring speed to 40 rpm, and keep it warm for 500min at a temperature of 110°C and a pressure of 0.2MPa , for an oxidation reaction.

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

[0061] (3) Filtration and washing

[0062] The material after high temperature oxidation is subjected to plate...

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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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