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Non-fired and non-steamed fly ash brick produced by using CFBC desulphurization residues and preparation process thereof

A technology of fly ash bricks and desulfurization ash, which is applied in the field of building materials, can solve the problems of large energy consumption, re-pollution of sulfur dioxide, low utilization rate of desulfurization ash, etc., and achieves the effects of solving low utilization rate, easy to popularize and use, and low cost.

Inactive Publication Date: 2010-08-18
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the present invention aims at the relatively low utilization rate of CFBC desulfurization ash, and the problem that the production of sintered bricks by the re-calcination process may cause sulfur dioxide pollution again, or the production of autoclaved bricks by the autoclave process requires a large amount of energy consumption, and provides A non-burning and non-steaming fly ash brick produced directly by using CFBC desulfurization ash and its preparation process

Method used

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  • Non-fired and non-steamed fly ash brick produced by using CFBC desulphurization residues and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Components and proportions: CFBC desulfurization ash 54%, bottom slag 25%, cement 6%, quicklime 10%, gypsum 5%.

[0014] Process: Mix CFBC desulfurization ash, bottom slag, cement, lime, gypsum and other components, add 13% (mass ratio) of water, stir for 2 minutes to make it uniform, then press and shape with 18MPa pressure and put it in a curing box for curing In 28 days, MU15 fly ash bricks are ready.

[0015] Effect: Appearance size and deviation meet the requirements of superior product (A), the test block has no obvious color difference, and other performance indicators are shown in Table 1.

Embodiment 2

[0017] Components and proportions: CFBC desulfurization ash 57%, bottom slag 20%, cement 8%, quicklime 12%, gypsum 3%.

[0018] Process: Mix CFBC desulfurization ash, bottom slag, cement, lime, gypsum and other components, add 15% (mass ratio) of water, stir for 2 minutes to make it uniform, and then press and shape with 20MPa pressure and put it in a curing box for curing In 28 days, MU20 fly ash bricks are ready.

[0019] Effect: Appearance size and deviation meet the requirements of superior product (A), the test block has no obvious color difference, and other performance indicators are shown in Table 1.

Embodiment 3

[0021] Components and proportions: 70% CFBC desulfurization ash, 10% bottom slag, 6% cement, 10% quicklime, and 4% gypsum.

[0022] Process: Mix CFBC desulfurization ash, furnace bottom slag, cement clinker, lime, gypsum and other components, add 18% water (mass ratio), stir for 2 minutes to make it uniform, and then press and shape with 22MPa pressure and put it in the curing box After curing for 28 days, it will become MU20 fly ash brick.

[0023] Effect: Appearance size and deviation meet the requirements of superior product (A), the test block has no obvious color difference, and other performance indicators are shown in Table 1.

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Abstract

The invention discloses a non-fired and non-steamed fly ash brick produced by using CFBC desulphurization residues and a production process thereof. A production raw material of the brick comprises the following components in proportion by weight: 50 to 70 percent of the CFBC desulphurization residues, 10 to 25 percent of furnace bottom slag, 4 to 8 percent of cement, 10 to 14 percent of quicklime and 3 to 6 percent of gypsum. The production process comprises the following steps of: mixing the components together and then stirring the mixture uniformly; adding water which is 12 to 18 percent of the mass of the mixture into the mixture; and performing press forming on the mixture by adopting a pressure of 16 to 22 MPa, and then performing curing to obtain the fly ash brick. The non-fired and non-steamed fly ash brick has a high mixed content of the CFBC desulphurization residues, not only can solve the problems of low utilization ratio of the CFBC desulphurization residues and resource wastes, but also can provide a novel production process of the non-fired and non-steamed fly ash brick; besides, the non-fired and non-steamed fly ash brick has the advantages of simple production process, low cost, convenient popularization and application, and great economic benefits, social benefits and environmental benefits.

Description

1. Technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a non-burning and steam-free fly ash brick produced by utilizing desulfurized ash discharged from a circulating fluidized bed boiler (Circulating Fluidized Bed Combustion, CFBC for short) and a preparation process thereof. 2. Background technology [0002] CFBC combustion technology is a clean combustion technology developed in the 1980s. The technology has the following characteristics: firstly, it has the advantages of good fuel adaptability, it can burn inferior coal, such as coal gangue, as well as domestic waste and various industrial wastes; secondly, the combustion temperature of CFBC is relatively low (800 ℃ ~900℃), the NOx emitted during the combustion process is also low, which is a relatively environmentally friendly combustion method; in addition, this combustion technology also has the advantages of simple process, small footprint, large loa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/08B28B3/00
CPCY02W30/91
Inventor 付晓茹黎飞虎郭照冰方华唐登勇徐德福
Owner NANJING UNIV OF INFORMATION SCI & TECH
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