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Method for preparing high-strength α-titanium gypsum from industrial waste titanium dioxide waste residue

A technology of industrial waste and titanium dioxide, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems affecting the crystallization process of high-strength α-titanium gypsum, the small crystal size of the product, and the low purity of dihydrate gypsum, so as to promote High-value and high-volume comprehensive utilization, excellent product quality, and low cost effects

Active Publication Date: 2021-07-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional hydrothermal method has obstacles in the preparation of high-strength α-titanium gypsum from titanium dioxide waste slag. The main reason is that the purity of dihydrate gypsum in titanium dioxide waste slag is low, and the impurities, especially iron and titanium, are high in content, which greatly affects the high-strength α-titanium gypsum. The crystallization process of gypsum leads to small crystal size, imperfect shape and poor product quality of products produced by conventional hydrothermal method

Method used

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  • Method for preparing high-strength α-titanium gypsum from industrial waste titanium dioxide waste residue
  • Method for preparing high-strength α-titanium gypsum from industrial waste titanium dioxide waste residue
  • Method for preparing high-strength α-titanium gypsum from industrial waste titanium dioxide waste residue

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Effect test

Embodiment 1

[0037] The method for preparing high-strength α-titanium gypsum by using industrial waste titanium dioxide waste slag of the present invention, the specific steps are as follows:

[0038] The titanium dioxide waste residue used is produced by the acid method and contains a certain amount of Fe after being treated with calcium hydroxide. 2 o 3 Impurities and a large amount of free water, the appearance is dark red and very viscous solid waste.

[0039] (1) Add water to the titanium dioxide waste residue that has been ground to a particle size of less than 270 meshes to prepare a slurry with a concentration of 10% by mass.

[0040](2) Add a composite nucleating agent to the slurry prepared in step (1), the composite nucleating agent is compounded by nucleating agent A and nucleating agent B in a weight ratio of 1:1, and the composite nucleating agent is formed The addition amount of the nucleating agent is 0.5% of the weight of the titanium dioxide waste residue, the nucleatin...

Embodiment 2

[0046] The method for preparing high-strength α-titanium gypsum by using industrial waste titanium dioxide waste slag of the present invention, the specific steps are as follows:

[0047] The titanium dioxide waste residue used is produced by the acid method and contains a certain amount of Fe after being treated with calcium hydroxide. 2 o 3 Impurities and a large amount of free water, the appearance is dark red and very viscous solid waste.

[0048] (1) Add water to the titanium dioxide waste residue that has been ground to a particle size of less than 270 meshes to prepare a slurry with a concentration of 50% by mass.

[0049] (2) Add a composite nucleating agent to the slurry prepared in step (1), the composite nucleating agent is compounded by nucleating agent A and nucleating agent B in a weight ratio of 1:10, and the composite nucleating agent is formed The addition amount of the nucleating agent is 3.0% of the weight of the titanium dioxide waste residue, the nucleat...

Embodiment 3

[0055] The method for preparing high-strength α-titanium gypsum by using industrial waste titanium dioxide waste slag of the present invention, the specific steps are as follows:

[0056] The titanium dioxide waste residue used is produced by the acid method and contains a certain amount of Fe after being treated with calcium hydroxide. 2 o 3 Impurities and a large amount of free water, the appearance is dark red and very viscous solid waste.

[0057] (1) Add water to the titanium dioxide waste slag that has been ground to a particle size of less than 270 meshes to prepare a slurry with a concentration of 30% by mass.

[0058] (2) Add a composite nucleating agent to the slurry prepared in step (1), the composite nucleating agent is compounded by nucleating agent A and nucleating agent B in a weight ratio of 1:5, and the composite nucleating agent is formed The addition amount of the nucleating agent is 1.0% of the weight of the titanium dioxide waste residue, the nucleating ...

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Abstract

The invention discloses a method for preparing high-strength α-titanium gypsum by utilizing industrial waste titanium dioxide waste residue, specifically: adding water to finely ground titanium dioxide waste residue to prepare slurry, adding a composite nucleating agent to the slurry and adjusting pH value to 1.0 to 5.5, then add it to the reaction kettle, stir and continue to feed oxygen, heat to a slight boiling state, constant temperature dehydration and crystallization, after the reaction is completed, the prepared solution is filtered under reduced pressure, and successively use boiling water and ethanol Wash and dry to obtain short hexagonal α-titanium gypsum crystals, sieve the obtained crystals and make 15-30% of 10-30 μm, 50-75% of 30-80 μm, and 10-20% of 80-200 μm. The high-strength α-titanium gypsum with an average particle size of 20-60 μm, a compressive strength of more than 70 MPa, regular shape and uniform size can be obtained. The method has the advantages of simple process, low cost and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste recycling, and in particular relates to a method for preparing high-strength α-titanium gypsum by using industrial waste titanium dioxide residue. Background technique [0002] When producing titanium dioxide by the acid method, a large amount of industrial waste acid will be produced as a by-product. These waste acids cannot be discharged directly. They are usually neutralized with calcium hydroxide and converted into industrial waste residue whose main component is calcium sulfate dihydrate. These titanium dioxide waste residues are piled up or landfilled, but this backward and primitive treatment method not only occupies a large amount of land, but also poses a serious threat to the environment, and brings a huge economic burden to titanium dioxide enterprises, seriously restricting the titanium dioxide industry. benign development. How to digest and convert titanium dioxide was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26C01F11/46
CPCC01F11/46C01P2004/03C01P2004/61C04B11/26
Inventor 赵辉刘杨王双飞黄崇杏赵思琪姚明珠
Owner GUANGXI UNIV
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