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Method for producing baking-free brick by doping phosphogypsum and fly ash

A technology of phosphogypsum and fly ash, which is applied in the field of non-fired bricks produced by phosphorus-doped gypsum and fly ash, can solve the problems of non-compliance with low-carbon environmental protection, unfavorable cost control, and large energy consumption, so as to promote dissolution and diffusion, The effect of reducing the average pore size and reducing production energy consumption

Inactive Publication Date: 2012-11-14
SICHUAN CHINA STRUCTURE RESIDENTIAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcining phosphogypsum consumes a lot of energy, and pressure molding also consumes energy. At the same time, calcium sulfate dihydrate decomposes to produce sulfur oxides, causing secondary pollution, which does not meet the national low-carbon environmental protection requirements.
Grinding phosphogypsum before using the original phosphogypsum can change the morphology of phosphogypsum and make the properties of phosphogypsum products more stable, which is very beneficial to the resource utilization of phosphogypsum, but it consumes a lot of energy when grinding phosphogypsum , unfavorable for cost control

Method used

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  • Method for producing baking-free brick by doping phosphogypsum and fly ash
  • Method for producing baking-free brick by doping phosphogypsum and fly ash
  • Method for producing baking-free brick by doping phosphogypsum and fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 1. Pretreatment of phosphogypsum: Neutralize and age for 24 hours with quicklime according to 2.5% of the mass of phosphogypsum;

[0045]2. Ingredients: The ingredients are composed of phosphogypsum, fly ash, quicklime and cement; the content of each component is: calculated according to the mass percentage of each raw material, 45% of phosphogypsum, 30% of fly ash, 15% of quicklime, and 10% of cement %, water consumption is 30% of all solid materials;

[0046] 3. Mixing and stirring: put phosphogypsum, fly ash, cement and quicklime into the mixer and mix and stir, then add water to fully stir to obtain the mixture;

[0047] 4. Pouring and forming: pour the mixture into the brick mold and form it, and then vibrate and form it on the vibrating table;

[0048] 5. Product curing: put the vibration-formed mold into the curing room for 24 hours. The temperature of the curing room should be kept at about 20°C, and the humidity should be above 60%. After the brick has initial...

Embodiment 2

[0051] 1. Pretreatment of phosphogypsum: Neutralize and age for 24 hours with quicklime according to 2.5% of the mass of phosphogypsum;

[0052] 2. Ingredients: The ingredients are composed of phosphogypsum, fly ash, quicklime and cement; the content of each component is: calculated according to the mass percentage of each raw material, 40% of phosphogypsum, 35% of fly ash, 15% of quicklime, and 10% of cement %, water consumption is 30% of all solid materials;

[0053] 3. Mixing and stirring: put phosphogypsum, fly ash, cement and quicklime into the mixer and mix and stir, then add water to fully stir to obtain the mixture;

[0054] 4. Pouring and forming: pour the mixture into the brick mold and form it, and then vibrate and form it on the vibrating table;

[0055] 5. Product curing: put the vibration-formed mold into the curing room for 24 hours. The temperature of the curing room should be kept at about 20°C, and the humidity should be above 60%. After the brick has initia...

Embodiment 3

[0058] 1. Pretreatment of phosphogypsum: Neutralize and age for 24 hours with quicklime according to 2.5% of the mass of phosphogypsum;

[0059] 2. Ingredients: The ingredients are composed of phosphogypsum, fly ash, quicklime and cement; the content of each component is: calculated according to the mass percentage of each raw material, 40% of phosphogypsum, 35% of fly ash, 15% of quicklime, and 10% of cement %, water consumption is 30% of all solid materials;

[0060] 3. Mixing and stirring: put phosphogypsum, fly ash, cement and quicklime into the mixer and mix and stir, then add water to fully stir to obtain the mixture;

[0061] 4. Pouring and forming: pour the mixture into the brick mold and form it, and then vibrate and form it on the vibrating table;

[0062] 5. Product curing: put the vibration-formed mold into the curing room for 24 hours. The temperature of the curing room should be kept at about 20°C, and the humidity should be above 60%. After the brick has initia...

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Abstract

The invention discloses a method for producing a baking-free brick by doping massive industrial residues phosphogypsum and fly ash, which has the advantages of low production energy consumption and high product strength. The method comprises the following steps: a. pretreating phosphogypsum; b. mixing the pretreated phosphogypsum, fly ash, cement and quicklime to prepare a dry mixture, wherein the dry mixture comprises 35-65 wt% of phosphogypsum, 15-40 wt% of fly ash, 7-18 wt% of quicklime and 8-12 wt% of cement; adding water, and sufficiently mixing to prepare a wet mixture, wherein the water accounts for 27-33 wt% of the dry mixture; c. pouring, and carrying out vibratory compaction; d. curing in a curing chamber; e. curing in a steam curing chamber; and f. naturally curing to prepare the baking-free brick. The method disclosed by the invention can dope massive industrial residues phosphogypsum and fly ash, and has the advantages of low production energy consumption and high product strength.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for producing non-burning bricks from phosphorus-doped gypsum and fly ash. Background technique [0002] Phosphogypsum is a by-product emitted during the production of wet-process phosphoric acid. About 5t of phosphogypsum is discharged for every 1t of phosphoric acid produced. According to the latest data, the annual emission of phosphogypsum in the world is about 280 million tons, and the annual emission of phosphogypsum in my country also reaches 50 million tons, accounting for more than 70% of the industrial by-product gypsum. The main component of phosphogypsum is dihydrate gypsum, and it also contains a small amount of phosphorus, fluorine, organic matter, alkali metal salt, silicon, iron magnesium, aluminum and other impurities. The existence of these harmful impurities degrades its performance and restricts its application in the field of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B28/10
Inventor 王培新全明张强军
Owner SICHUAN CHINA STRUCTURE RESIDENTIAL IND
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