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Coal ash sintered brick and sintering process

A technology of fly ash and sintered bricks, applied in the field of material engineering, can solve the problems of low flexural resistance, high water absorption, clay and low strength, etc., and achieve high compressive and flexural strength, low water absorption, and low cost Effect

Inactive Publication Date: 2012-10-10
张书源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of fly ash sintered brick and its firing process to solve the problem of low strength, low flexural resistance, poor high temperature resistance, high water absorption, easy corrosion by alkali and easy weathering of existing sintered bricks. and other issues; and the use of waste fly ash to reduce a series of social and environmental problems caused by the destruction of cultivated land and waste fly ash in the process of firing bricks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Ingredients: fly ash dry ash 98%, industrial pure sodium metasilicate with a modulus of 1 1.5%, sodium carbonate 0.5%. According to the above raw material ratio, make sodium metasilicate into a concentrated solution and mix it with water first, then mix it with fly ash and sodium carbonate. The ratio of water to mixed slurry is 1:5, and stir for 12 minutes to make it fully stirred evenly .

[0016] 2. Forming: Pour the pressed mixture into the mold and press it into a solid brick adobe. After pressing, take it out and take it to a cool and sunny place to dry for 10 days to obtain a dry adobe for use.

[0017] 3. Sintering: Put the dry billet in the kiln, heat up for 1.5 hours, the temperature rises to 1160 degrees Celsius, maintain the temperature for 5 minutes, artificially cool down to 600 degrees Celsius within 45 minutes, ventilate and cool to room temperature, and leave the kiln.

[0018] 4. Product inspection: Eliminate defective products and obtain qualified ...

Embodiment 2

[0020] 1. Ingredients: Fly ash primary wet ash discharge 90%, industrial pure sodium metasilicate with a modulus of 3.5 7%, sodium carbonate 3%. According to the above raw material ratio, make sodium metasilicate into a concentrated solution, mix it with water first, and then mix it with fly ash and sodium carbonate. The ratio of water to mixed slurry is 1:3, and stir for 10 minutes to make it fully stirred evenly .

[0021] 2. Forming: Pour the pouring-type mixture into the mold and pour it into a hollow brick adobe. After hardening for 1 day, remove the surrounding mold. After 4 days, remove it from the mold and take it to a cool and sunny place to dry for 20 days to obtain a dry billet for use.

[0022] 3. Sintering: put the dry billet in the kiln, heat up for 2 hours, the temperature rises to 1050 degrees Celsius, maintains the temperature for 10 minutes, artificially cools down to 500 degrees Celsius within 45 minutes, ventilates and cools down to room temperature, and le...

Embodiment 3

[0025] 1. Ingredients: fly ash secondary dry ash 95%, industrial pure sodium metasilicate with a modulus of 2 4%, sodium carbonate 1%. According to the above raw material ratio, make sodium metasilicate into a concentrated solution and mix it with water first, and then mix it with fly ash and sodium carbonate. The ratio of water to mixed slurry is 1:2, and stir for 10 minutes to make it fully stirred evenly .

[0026] 2. Molding: Add foaming agent (according to 100 grams of fly ash plus 1 ml of 50% hydrogen peroxide as an example) and surfactant (according to 100 grams of fly ash plus 0.5 grams of plant type surfactant as an example), stir for 12 minutes to make it fully stirred evenly. After pouring into the mold for 50 minutes, smooth the surface of the foamed slurry. After 2 days of hardening, take off the surrounding molds, and after 3 days, take off the molds and get them to air-dry for 15 days in a cool and sunny place to obtain dry blanks for subsequent use.

[0027]...

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Abstract

The invention relates to a coal ash sintered brick and a sintering process, which belong to the technical field of material engineering. The sintered brick is made in the following steps: sodium metasilicate and sodium carbonate which are used as exciting agents are added into coal ash to form a geopolymer, and Si-O-Al bond formed by the geopolymer is used as a net support frame to sinter ceramic at high temperature. The sintered brick consists of coal ash, sodium metasilicate with modulus of 1-3.5, and sodium carbonate. The sintering process comprises the following steps: (1) burdening; (2) molding; (3) sintering; and (4) product inspection: picking out rejected products and obtaining the qualified pure coal ash brick. The sintering process provided by the invention has the advantages that ingredients and blanks not containing clay protect cultivated land and clay resources, various sintered bricks sintered by the sintering process is low in cost, has high compressive strength and breaking strength, and low water absorption and even have high strength at 1000 DEG C, and the coal ash contains a large amount of unburned carbon, thereby saving part of fuel. An insulation board can be sintered with the sintering process by an insulation board mold according to the ingredient proportion.

Description

technical field [0001] The invention belongs to the technical field of material engineering and relates to a wall material production technology. Background technique [0002] Various types of fired bricks currently used in the market are mixed with a certain amount of clay, which seriously damages cultivated land. For this reason, the country has issued many policies to restrict its use. Moreover, due to the different soil properties in different regions, the strength and flexural resistance of the fired bricks are different, and the quality of the bricks varies from place to place; compared with autoclaved bricks, cement bricks and blocks, fired bricks have lower strength and higher water absorption. , susceptible to alkali corrosion and weathering. There are the following defects and deficiencies in the proportion of raw materials of several types of sintered bricks: clay bricks, shale bricks, coal gangue bricks, fly ash bricks, lime sand bricks, sintered porous bricks a...

Claims

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Application Information

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IPC IPC(8): C04B38/02
CPCC04B28/006Y02P40/10
Inventor 张书源
Owner 张书源
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