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Method for preparing building materials with circulating fluid bed slag

A circulating fluidized bed and building material technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low activity, poor durability, and low strength of circulating fluidized bed slag, and achieve easy variety adjustment , Overcoming fatal flaws, high strength effect

Active Publication Date: 2017-02-01
韩涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing building materials by utilizing circulating fluidized bed slag in order to solve the problem of low activity and difficult utilization of existing circulating fluidized bed slag
The present invention uses circulating fluidized bed slag (CFB) as the main raw material, coupled with gypsum materials to manufacture ultra-high-strength materials. At the same time, the method of the present invention also solves the shortcomings of gypsum products such as low strength and poor durability.

Method used

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  • Method for preparing building materials with circulating fluid bed slag
  • Method for preparing building materials with circulating fluid bed slag
  • Method for preparing building materials with circulating fluid bed slag

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Experimental program
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Embodiment 1

[0034] The specific surface area will be 450 m 2 / kg desulfurization gypsum 400g (40%), specific surface area 650m 2 / kg circulating fluidized bed slag (CFB) powder 300g (30%), specific surface area 380 m 2 / kgP·O42.5 50g (5%) of cement and 250g (25%) of river sand with a fineness modulus of 2.8 are dry mixed in a mixer for 3 minutes; then add 180g of water (18% of the dry mass of all solid materials) , an additional 1.5g alkaline activator (accounting for 0.5% of circulating fluidized bed slag powder) was added to the water, wet mixed for 10min; after standing for 15min, pressurized at 40MPa for 30s to obtain a super-strong material body; in the concrete curing room 28 days of natural maintenance to obtain ultra-high-strength material L 1 , after resting for 1 hour, cured in saturated steam at 75°C for 6 hours, the super-high-strength material L 2 , compressive strength see image 3 .

Embodiment 2

[0036] Put 2500g of circulating fluidized bed slag (CFB) and 2500g of dry phosphogypsum into a 500×500mm standard ball mill for grinding for 50 minutes to obtain a specific surface area of ​​698 m 2 / kg of mixture, take 620g of mixture (where circulating fluidized bed slag (CFB) accounts for 31% of the total dry basis material, phosphogypsum accounts for 31% of the total dry basis material), and the specific surface area is 380 m 2 / kg P·O4 2.5 cement 80g (accounting for 8% of the total dry basis material) and 300g of river sand with a fineness modulus of 2.8 (accounting for 30% of the total dry basis material) are dry mixed in the mixer for 4min; then add 180g of water (plus the water brought in by gypsum accounted for 18% of the total dry material), and an additional 1.8g of alkaline activator (accounting for 0.6% of circulating fluidized bed slag (CFB) powder) was added to the water, and wet mixed for 8 minutes; After standing for 30 minutes, hold the pressure at 45MPa for ...

Embodiment 3

[0038] Put 2800g of circulating fluidized bed slag and 2200g of fluorine gypsum into a 500×500mm standard ball mill to grind for 65min to obtain a specific surface area of ​​708m 2 / kg of mixture, take 670g of mixture (where circulating fluidized bed slag (CFB) accounts for 37.5% of the total dry basis material, fluorine gypsum accounts for 29.5% of the total dry basis material), and the specific surface area is 380 m 2 / kg P·O4 2.5 cement 90g (accounting for 9% of the total dry basis material) and 240g of machine-made sand with a fineness modulus of 3.2 (accounting for 24% of the total dry basis material) are dry mixed in the mixer for 3min; then add 200g of water (plus the water brought in by gypsum accounted for 20% of the total dry material), and an additional 1.4g of alkaline activator (accounting for 0.47% of circulating fluidized bed slag (CFB) powder) was added to the water, and wet mixed for 9 minutes; After standing still for 30 minutes, hold the pressure at 45MPa for...

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Abstract

The invention relates to a method for preparing building materials with circulating fluid bed slag. The method includes the steps that the fluid bed slag, gypsum or industrial by-product gypsum, aggregate and calcium binding materials are prepared into dried mixed materials, then a proper amount of water and an exciting agent are additionally added, the mixture is metered, watered and mixed and subjected to extrusion forming, steaming or natural curing and the like, and ultrahigh strength materials are prepared. By means of the method, the problems that low-grade circulating fluid bed slag (CFB) is low in activity and difficult to use can be solved; meanwhile, the low-grade circulating fluid bed slag is coupled with a large amount of gypsum or industrial by-product gypsum, and the ultrahigh strength materials with the compressive strength of 60 MPa to 150 MPa are prepared. The building materials can be prepared into various high-strength and high-durability products such as high-strength building bricks, high-strength road bricks, high-strength water permeable bricks, road edge stones and various decorative boards.

Description

technical field [0001] The invention relates to a new type of material, in particular to a method for comprehensively utilizing circulating fluidized bed slag (CFB) coupled with gypsum materials to manufacture building materials. Background technique [0002] In recent years, the output of coal gangue and low-quality coal has increased year by year, and most of them are burned by Circulation Fluidized Bed (CFB) boiler combustion technology. Compared with ordinary coal-fired furnaces, CFB boilers have wide combustion adaptability and high combustion intensity. Large, the advantage of being able to calcine coal gangue, coal slime and other low calorific value fuels. However, due to the requirements of the production process and the influence of coal quality (large ash content, high sulfur content), low-temperature combustion (750-900°C), in-furnace desulfurization and out-of-furnace desulfurization processes are often used, resulting in a large amount of ash (also known as "CF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/10
CPCC04B18/10C04B28/14C04B28/142C04B28/143C04B28/144C04B2201/50C04B7/02C04B14/068C04B2103/0068C04B14/06Y02W30/91
Inventor 韩涛靳秀芝
Owner 韩涛