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Fly ash-based porcelain brick preparation method

A technology of fly ash and porcelain bricks, which is applied to the utilization of industrial solid waste and the large-scale use of power plant waste fly ash to prepare porcelain bricks. The problem of low efficiency and other problems can be achieved to solve the effect of low strength of code blank, low molding pressure and fast firing process

Active Publication Date: 2017-02-01
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN104129972A discloses the preparation of a high-efficiency and energy-saving fly ash sintered brick, which improves the stability of the product by means of multiple stirring and forced mixing, and solves the low strength of the fly ash brick during the drying process and deformable problems
But the green body made in the above-mentioned patent application is easily broken, and the finished product rate is low

Method used

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  • Fly ash-based porcelain brick preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the fly ash of a power plant in Changzhi, Shanxi is used, and its main component is 49.60% SiO 2 , 35.66% Al 2 o 3 and 3.48% Fe 2 o 3 . see figure 1 , the fly ash after iron removal was pretreated in a NaOH solution with a concentration of 300g / L and a temperature of 100°C for 0.5h. The main component of fly ash after treatment is 45.46% SiO 2 , 34.66% Al 2 o 3 and 2.31% Fe 2 o 3 . The green body formula used is: 50% modified fly ash, 25% feldspar and 25% kaolin, according to the formula ingredients, add 35% (35% of the total mass of the slurry after ball milling, the addition of water in other embodiments is defined The same) water, ball milling until it turns into a uniform slurry (after the ball milling, the slurry passes through a 250 mesh sieve and the sieve residue is less than 1.0%), and the slurry is sieved to obtain uniform particles after drying the obtained slurry, and the obtained particle powder is stale for 24 hours. Dry press ...

Embodiment 2

[0032] In this example, the fly ash of a power plant in Changzhi, Shanxi is used, and its main component is 49.60% SiO 2 , 35.66% Al 2 o 3 and 3.48% Fe 2 o 3 . The fly ash after iron removal was pretreated in NaOH solution with a concentration of 50g / L and a temperature of 120°C for 10h. The main component of fly ash after treatment is 39.49% SiO 2 , 37.48% Al 2 o 3 and 2.38% Fe 2 o 3 . The green body formula used is: 75% modified fly ash, 13% feldspar, 10% kaolin and 2% bentonite. After batching according to the formula, add 35% water, add 1% sodium tripolyphosphate, and ball mill to chemical It is a uniform slurry (after ball milling, the slurry passes through a 250-mesh sieve and the sieve residue is less than 1.0%), and the slurry is sieved. Uniform particles are obtained after the obtained slurry is dried, and the obtained particle powder is stale for 24 hours. Dry press molding after aging, the molding pressure is 40MPa, and dry after molding (the drying pass...

Embodiment 3

[0034] This example uses fly ash from a power plant in Inner Mongolia, whose main component is 39.04% SiO 2 , 48.19% Al 2 o 3 and 2.19% Fe 2 o 3 . The fly ash after iron removal was pretreated in NaOH solution with a concentration of 300g / L and a temperature of 50°C for 8h. The main component of fly ash after treatment is 30.24% SiO 2 , 52.37% Al 2 o 3 and 1.48% Fe 2 o 3. The green body formula used is: 30% modified fly ash, 20% feldspar, 40% kaolin and 10% quartz. After mixing according to the formula, add 40% water, add 1% water glass, and ball mill until it becomes uniform Slurry (after ball milling, the slurry passes through a 250-mesh sieve and the sieve residue is less than 1.0%), and the slurry is sieved. Uniform particles are obtained after the obtained slurry is dried, and the obtained particle powder is stale for 24 hours. Dry press molding after aging, the molding pressure is 40MPa, and dry after molding (the drying pass rate is 99.6%, and the bending re...

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Abstract

The invention discloses a fly ash-based porcelain brick preparation method, which comprises: 1) treating a raw material: carrying out iron removing on fly ash, mixing the obtained fly ash and an alkali liquid, carrying out a stirring reaction for 0.5-10 h at a temperature of 50-120 DEG C, carrying out solid-liquid separation on the obtained slurry, and drying to obtain modified fly ash; 2) mixing the modified fly ash obtained in the step 1), kaolin, bentonite, feldspar and quartz according to a certain ratio, adding water and electrolyte, adding into a ball mill, carrying out ball milling to obtain a uniform slurry, screening the obtained slurry, drying into a granular material, adding into a material bin, and aging for 1-3 days to obtain solid powder so as to be spare; 3) molding the solid powder obtained in the step 2) under a certain pressure, and drying the molded billet; and 4) firing the dried billet obtained in the step 3) at a high temperature, and cooling to obtain the porcelain brick. According to the present invention, the water absorption rate of the prepared porcelain brick is less than 0.5%, the flexural strength is much greater than 35 MPa, and the GB / T4100-2006 quality requirements are met.

Description

technical field [0001] The invention belongs to the fields of comprehensive utilization of solid waste and production of ceramic materials. Specifically, the invention relates to a method for utilizing industrial solid waste, in particular to a method for preparing porcelain bricks by using fly ash of power plant waste in large quantities. Background technique [0002] Fly ash is a powdery particle formed after coal combustion, and is a solid waste produced in the production process of coal-fired power plants. With the rapid development of my country's power industry, fly ash emissions have increased significantly. In 2010, my country's fly ash emission was 480 million tons, and it is expected to reach 580 million tons in 2015. Due to the large amount of production, concentrated production areas and insufficient effective utilization, a large amount of fly ash has been stockpiled. At present, the cumulative stockpile has reached nearly 3 billion tons, and fly ash has become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132
CPCY02P40/60
Inventor 马淑花梁海果王建宇严文纪李洋洋王晓辉郑诗礼王月娇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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