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Building block produced by using phosphogypsum, carbide slag and coal ash through carbonization and steam curing

A technology of building blocks and calcium carbide slag, which is applied in the field of building materials, can solve problems such as high alkali content, pollute the environment, block sewers, etc., and achieve the effect of high product strength

Inactive Publication Date: 2014-02-26
王天国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbide slag has a large amount, high alkali content, and contains harmful substances such as sulfur and arsenic. If it is discharged without treatment, it will block the sewer, accumulate river beds, and endanger fishery production.
Stacking on land takes up land and pollutes the environment

Method used

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  • Building block produced by using phosphogypsum, carbide slag and coal ash through carbonization and steam curing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Phosphogypsum, carbide slag, and fly ash are used to produce building blocks by carbonization and steam curing. Its formula and production steps are as follows:

[0056] Raw material formula

[0057] Phosphogypsum 30% Carbide slag 30% Fly ash 30%

[0058] Coarse sand 10% Pigment 0.1% Water Appropriate amount

[0059] steps:

[0060] 1. Preparation of materials: Grind phosphogypsum and fully mix it with 2-5% calcium carbide slag; at the same time, add water to adjust it to a wet state, and accumulate it for 10-48 hours, during which the pH value is maintained at 7-9.5;

[0061] 2. Mixed material Take 1 of the prepared material and mix it with other materials in proportion, add water during stirring to adjust to easy processing and molding to obtain the mixed material;

[0062] 3. Molding Put the 2 compound into the molding machine and mold it under the pressure of 15-50MPa to form the product blank;

[0063] 4. Carbonization The product blank is heated in the carboni...

Embodiment 2

[0068] Phosphogypsum, carbide slag, and fly ash are used to produce building blocks by carbonization and steam curing. Its formula and production steps are as follows:

[0069] Raw material formula

[0070] Phosphogypsum 30% Carbide slag 30% Fly ash 30%

[0071] Coarse sand 10% Additive 0 Water Proper amount

[0072] steps

[0073] 1. Preparation of materials: Grind phosphogypsum and fully mix it with 2-5% calcium carbide slag; at the same time, add water to adjust it to a wet state, and accumulate it for 10-48 hours, during which the pH value is maintained at 7-9.5;

[0074] 2. Mixed material Take 1 of the prepared material and mix it with other materials in proportion, add water during stirring to adjust to easy processing and molding to obtain the mixed material;

[0075] 3. Molding Put the 2 compound into the molding machine and mold it under the pressure of 15-50MPa to form the product blank;

[0076] 4. Carbonization The product blank is heated in the carbonization k...

Embodiment 3

[0081] Phosphogypsum, carbide slag, and fly ash are used to produce building blocks by carbonization and steam curing. Its formula and production steps are as follows:

[0082] Raw material formula

[0083] Phosphogypsum 40% Carbide slag 30% Fly ash 20%

[0084] Coarse sand 10% Additive 0 Water Proper amount

[0085] steps:

[0086] 1. Preparation of materials: Grind phosphogypsum and fully mix it with 2-5% calcium carbide slag; at the same time, add water to adjust it to a wet state, and accumulate it for 10-48 hours, during which the pH value is maintained at 7-9.5;

[0087] 2. Mixed material Take 1 of the prepared material and mix it with other materials in proportion, add water during stirring to adjust to easy processing and molding to obtain the mixed material;

[0088] 3. Molding Put the 2 compound into the molding machine and mold it under the pressure of 15-50MPa to form the product blank;

[0089] 4. Carbonization The product blank is heated in the carbonization ...

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Abstract

The invention provides a building block produced by using phosphogypsum, carbide slag and coal ash through carbonization method and steam curing. A production method of the building block is characterized by comprising the following steps: mixing and stirring raw materials which comprise 5-70% of phosphogypsum, 10-70% of carbide slag, 15-70% of coal ash, 8-10% of coarse sand, 0-2% of additive and a right amount of water; carrying out compression molding; carbonizing a product blank in a carbonization kettle for 8-48 hours under the environmental conditions of the temperature of 10-60 DEG C, the high-concentration CO2 and the pressure of 0.1-0.2 Mpa; and carrying out steam curing on the carbonized product blank for 4-10 hours in a steam-curing kettle under the environmental conditions of the saturated vapor, the temperature of 174-190 DEG C and the pressure of 0.8-1.2Mpa.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to the production of building blocks by carbonization and steam curing of phosphogypsum, carbide slag and fly ash. Background technique [0002] Phosphogypsum is a solid waste discharged from the production of phosphoric acid or other phosphorus series products, and its main component is CaSO 4 2H 2 O and Na 2 SiF 6 Wait. Since phosphoric acid, sulfuric acid and hydrofluoric acid remain in phosphogypsum, it is considered as an acidic by-product (pH<3). Whether at home or abroad, the resource utilization of phosphogypsum is not satisfactory. The effective utilization rate of phosphogypsum in the world is only about 4.5%, and the utilization rate of phosphogypsum in developed countries such as Japan, South Korea and Germany is relatively high. By the end of 2011, China had accumulatively accumulated more than 300 million tons of phosphogypsum. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/30
CPCY02W30/91
Inventor 王天国
Owner 王天国
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