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Method for preparing building material by using phosphogypsum

A building material, phosphogypsum technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low strength and poor durability, achieve high strength, overcome poor water resistance, and realize functionalization 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

The building materials prepared by the present invention can produce various high-strength and high-durability products such as high-strength building bricks, high-strength road bricks, high-strength permeable bricks, roadside stones, various decorative boards, etc. by changing the forming mold method. The disadvantages of low strength and poor durability of similar products

Method used

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  • Method for preparing building material by using phosphogypsum
  • Method for preparing building material by using phosphogypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The specific surface area will be 450 m 2 / kg phosphogypsum 400g (40%), specific surface area 600 m 2 / kg water-quenched granulated blast furnace slag 300g (30%), specific surface area 380 m 2 / kgP·O4 50g (5%) of cement and 250g (25%) of river sand with a fineness modulus of 2.4 are dry mixed in a mixer for 3 minutes; then add 150g of water (15% of the dry mass of all solid materials) , an additional 1.5g of alkaline activator (accounting for 0.5% of the water-quenched granulated blast furnace slag powder) was added to the water, and wet mixed for 10 minutes; after standing for 15 minutes, the pressure was maintained at 40MPa for 30s to obtain a super-strong material body; Indoor natural conservation for 28 days to obtain ultra-high-strength building materials A 1 , after standing still for 1 hour, cured in saturated steam at 80°C for 9 hours, the super-high-strength building material A was obtained 2 , compressive strength see figure 2 .

Embodiment 2

[0038]Put 2500g of phosphogypsum with a moisture content of 8% and 2500g of water-quenched ferronickel slag into a 500×500mm standard ball mill for grinding for 58 minutes to obtain a specific surface area of ​​624 m 2 / kg of mixture, take 620g of mixture (dry phosphogypsum accounts for 29% of the total dry basis material, water-quenched ferronickel slag accounts for 32% of the total dry basis material), and the specific surface area is 380 m 2 / kg P·O4 2.5 cement 60g (accounting for 6.2% of the total dry basis material) and 320g of river sand with a fineness modulus of 2.4 (accounting for 32.8% of the total dry basis material) are dry mixed in the mixer for 4min; then add 150g of water (plus the water brought in by gypsum accounts for 17.9% of the total dry basis material), add an additional 1.8g of alkaline activator (accounting for 0.6% of the water-quenched ferronickel slag powder) in the water, wet mix for 8 minutes; stand for 30 minutes After holding the pressure at 45MP...

Embodiment 3

[0040] Put 2800g of phosphogypsum with a moisture content of 6% and 2200g of water-quenched manganese slag into a 500×500mm standard ball mill for grinding for 67 minutes to obtain a specific surface area of ​​650 m 2 / kg of mixture, take 670g of mixture (dry phosphogypsum accounts for 36.1% of the total dry basis material, water-quenched manganese slag accounts for 30.1% of the total dry basis material), and the specific surface area is 380 m 2 / kg P·O4 2.5 cement 90g (accounting for 9.2% of the total dry basis material) and 240g of machine-made sand with a fineness modulus of 3.2 (accounting for 24.6% of the total dry basis material) are dry mixed in the mixer for 3min; then add 140g of water (plus the water brought in by gypsum accounted for 16.6% of the total dry material), added an additional 1.4g of alkaline activator (accounting for 0.47% of the water-quenched manganese slag powder) to the water, wet mixed for 9 minutes; after standing for 30 minutes Hold the pressure a...

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Abstract

The invention relates to a method for preparing a building material by using phosphogypsum. The method comprises the steps of firstly, preparing a dry blend by using the phosphogypsum, aluminosilicate industrial residues, a calcium cementing material and aggregate, then adding water or water with a dissolved activator to obtain a wet mixture, standing, carrying out static pressure molding, and finally, carrying out natural or steam curing to obtain an ultrahigh strength material. The method solves the problems that the phosphogypsum has more impurities and is difficult to utilize, and can be used for preparing the ultrahigh strength building material with high compressive strength by enabling the phosphogypsum to be coupled with a great deal of aluminosilicate industrial residues. The ultrahigh strength building material can be used for preparing 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 by changing a molding mould, and overcomes the defects that gypsum products are low in strength and poor in water resistance and durability. The method realizes functionalization, greenization and high value while consuming a great deal of phosphogypsum and aluminosilicate industrial residues, thus having good economic benefit and social benefit.

Description

technical field [0001] The invention relates to a new type of building material, in particular to a technology for manufacturing ultra-high-strength building materials through the coupling of phosphogypsum and aluminosilicate industrial waste residues, in particular to a method for using phosphogypsum to prepare building materials. Background technique [0002] Phosphogypsum is the industrial waste slag discharged from wet-process phosphoric acid production. Generally, every 1t of wet-process phosphoric acid (in P 2 o 5 Total) 4~4.5t of phosphogypsum will be produced by-product. The annual discharge of phosphogypsum in the world is close to 200 million tons, and the annual discharge of phosphogypsum in my country is more than 10 million tons, which not only occupies a lot of land, but also seriously pollutes the environment. [0003] The biggest difference between phosphogypsum and natural gypsum is that phosphogypsum contains certain impurities, and these impurities cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/14
CPCC04B28/143C04B2201/52C04B18/141C04B7/02C04B14/068C04B2103/0068C04B18/144C04B14/02Y02W30/91
Inventor 韩涛靳秀芝
Owner 韩涛
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