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Fluid-bed boiler fly ash autoclaved brick and preparation method thereof

A fluidized bed boiler, fly ash technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of low shear strength of masonry, easy cracks in walls, and large drying shrinkage and other problems, to achieve the effect of good product quality, low cost and good frost resistance

Active Publication Date: 2008-10-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) The commonly used cementing material for existing fly ash bricks is quicklime, the price of quicklime is relatively high, and it needs to be ground by a ball mill, and it takes 2 to 3 hours for digestion.
[0006] Moreover, the drying shrinkage rate of the existing fly ash brick products is relatively large, generally 0.6-1.0%, and the masonry wall is prone to cracks. The cracks mainly occur on the upper part of the inner wall at the junction of the inner and outer walls, showing a figure-eight oblique crack. The middle part of the gable wall: 45-degree oblique cracks above and below the door and window openings, vertical mortar joints along the wall of the window openings and vertical or step cracks in the middle of the bricks; there are also horizontal cracks in the roof parapet
[0007] Existing fly ash bricks are all molded, the brick surface is smooth, and the bonding force with ordinary cement mortar is relatively poor, resulting in low shear strength of the masonry, which is not conducive to the application in earthquake-resistant fortification areas

Method used

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  • Fluid-bed boiler fly ash autoclaved brick and preparation method thereof
  • Fluid-bed boiler fly ash autoclaved brick and preparation method thereof
  • Fluid-bed boiler fly ash autoclaved brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Material preparation:

[0031] (1) Fly ash: Transport the fly ash in the electric dust collection warehouse of No. 1 boiler of the thermal power plant to the brick factory and put it into the ash storage tank.

[0032] (2) Transport the slag and stone salt to the batching hopper for standby.

[0033] (3) Transport the calcium carbide slag to the batching hopper for standby.

[0034] 2. The weight of ingredients is divided into 100 groups:

[0035] Fly ash 40%, 1# boiler slag or stone salt 40% and calcium carbide slag 20%.

[0036] 3. Stirring:

[0037] Put the ingredients into a double-shaft forced mixer, add 10% of the total weight of the ingredients and mix and stir.

[0038] 4. Wheel grinding:

[0039] Put the stirred mixture into the wheel mill for 4 minutes.

[0040] 5. Brick making:

[0041] The wheel-rolled mixed molding material is sent to the HF1100 ton hydraulic brick machine for compression molding, the molding pressure is 100MPa, and 32 standard bricks are pr...

Embodiment 2

[0047] In the fluidized bed boiler fly ash autoclaved brick of the present invention, the raw material weight is divided into 100% by weight: 1# boiler fly ash 50%, 1# boiler slag and stone salt half a total of 30% and calcium carbide slag 20%.

[0048] Preparation:

[0049] The ingredients are mixed with water by a double-shaft forced mixer. The amount of water added is 12% of the total weight of the ingredients. It is pulverized by a wheel mill. The wheel milling time is 5 minutes. It is molded by a HF1100 ton hydraulic forming machine, and the molding pressure is 100MPa , There are uneven patterns on the pressing mold, which are used to form a rough surface. Finally, after high-pressure steam curing, water vapor is injected, the pressure is 0.8MPa, the temperature is 200℃, the constant temperature and pressure hold time is 6 hours, and then the temperature and pressure are naturally reduced for 2 hours. , Get the product.

Embodiment 3

[0051] In the fluidized bed boiler fly ash autoclaved brick of the present invention, the weight of raw materials is divided into 100%: 1# boiler fly ash 45%, petrolatum 30%, and calcium carbide slag 25%.

[0052] Preparation:

[0053] The ingredients are mixed with water by a double-horizontal forced mixer. The amount of water added is 7% of the total weight of the ingredients. It is pulverized by a wheel mill. The wheel milling time is 5 minutes. It is molded by a HF1100 ton hydraulic molding machine, and the molding pressure is 100MPa , There are uneven patterns on the pressing mold, which are used to form a rough surface. Finally, after high-pressure steam curing, water vapor with a pressure of 0.9MPa and a temperature of 185°C is introduced. The constant temperature and pressure are maintained for 5.5 hours, and then the temperature is naturally cooled down. Press for 2.5 hours to complete the product.

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Abstract

The present invention relates to one kind of fluidized bed boiler flyash steaming and pressurizing brick and its making process. The brick is made with flyash in 40-50 wt%, cinder and / or stone bits in 30-40 wt% and carbide slag in 20- 25 wt%, and through mixing after adding water, rolling to crushing, pressing to form and high pressure steam curing. The present invention has best utilization of slag resource, low cost and environment friendship, and the product has high quality, high strength, small shrinkage, high antifreezing performance and high stability.

Description

Technical field [0001] The invention relates to a preparation method of fly ash autoclaved bricks for fluidized bed boilers, which utilize industrial waste slag to produce building bricks. Background technique [0002] There have been reports on the production of fly ash bricks, and the situation is as follows: [0003] (1) The raw material for the production of relatively mature fly ash bricks is the fly ash burned in a pulverized coal boiler. This kind of fly ash has small particle size, low carbon content, generally less than 8%, relatively high calcium and silicon content, and is easy to use. The fly ash produced by the circulating fluidized bed boiler is red, red ash, and the carbon content is too high, generally about 20%, which affects the application of bricks, mainly due to the weak strength of the finished bricks and poor freeze-thaw resistance indicators. etc. [0004] (2) The commonly used cementing material for existing fly ash bricks is quicklime. Quicklime is more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/08C04B18/10C04B18/14
CPCY02W30/91
Inventor 张广新陈茂波裴友民孙天增贾世起李红伟王清臣张宗军李建民国承材
Owner GUIZHOU BRANCH CHINA ALUMINUM IND