Water permeable brick prepared by using molecular sieve waste as raw material

A technology of molecular sieves and permeable bricks, applied in ceramic products, solid waste management, sustainable waste treatment, etc., can solve the problems of crushing, wear, and a large amount of debris, and achieve the effect of rich pore structure and large specific surface area

Inactive Publication Date: 2020-02-14
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molecular sieves participating in the catalytic reaction for a long time will cause wear and tear, cannot maintain the inherent macroscopic structure, and need to be replaced regularly
In addition, the molecular sieve preparation process will also produce a lot of debris
These waste molecular sieves and molecular sieve debris are generated in large quantities and are difficult to handle and utilize. Currently, they are only piled up or landfilled as solid waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 60kg of cement, 12.95kg of molecular sieve waste, 27kg of sand, and 7kg of water, and mix them as raw materials for brick making. Among them, the average particle size of molecular sieve waste is 1.6mm, and the specific surface area is 300m 2 / g. The molding pressure in the brick making process is 20MPa, the steam curing temperature after molding is 60°C, and the curing time is 24h.

[0014] Performance tests are performed on finished bricks that have been shaped and cured. It was measured on the third day after it was made, and the compressive strength was 28MPa, the flexural strength was 6.7MPa, and the volume expansion rate was 0.023%. Measured on the 28th day after it was made, the compressive strength was 30MPa, the flexural strength was 6.9MPa, the volume expansion rate was 0.025%, and the water permeability coefficient was 1.7×10 -2 cm / s, the 24h pollutant transmission rate is 3.2%.

Embodiment 2

[0016] Take 65kg of cement, 14.63kg of molecular sieve waste, 20.37kg of sand, and 8kg of water, and mix them as raw materials for brick making. Among them, the average particle size of molecular sieve waste is 2.0mm, and the specific surface area is 415m 2 / g. The molding pressure in the brick making process is 22MPa, the steam curing temperature after molding is 65°C, and the curing time is 36h.

[0017] Performance tests are performed on finished bricks that have been shaped and cured. It was measured on the third day after it was made, and the compressive strength was 33MPa, the flexural strength was 6.4MPa, and the volume expansion rate was 0.040%. Measured on the 28th day after it was made, the compressive strength was 35MPa, the flexural strength was 6.9MPa, the volume expansion rate was 0.043%, and the water permeability coefficient was 1.7×10 -2 cm / s, the 24h pollutant transmission rate is 2.8%.

Embodiment 3

[0019] Take 70kg of cement, 15.4kg of molecular sieve waste, 14.6kg of sand, and 9kg of water, and mix them as raw materials for brick making. Among them, the average particle size of molecular sieve waste is 1.0mm, and the specific surface area is 475m 2 / g. The molding pressure in the brick making process is 23MPa, the steam curing temperature after molding is 70°C, and the curing time is 48h.

[0020] Performance tests are performed on finished bricks that have been shaped and cured. It was measured on the third day after it was made, and the compressive strength was 34MPa, the flexural strength was 6.3MPa, and the volume expansion rate was 0.030%. Measured on the 28th day after it was made, the compressive strength was 35MPa, the flexural strength was 7.0MPa, the volume expansion rate was 0.040%, and the water permeability coefficient was 2.2×10 -2 cm / s, 24h pollutant transmission rate is 3.5%.

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Abstract

The invention belongs to a brick, and discloses a water permeable brick prepared by using molecular sieve waste as a raw material. The water permeable brick is prepared from the raw materials: a binding material, aggregate and a dispersant. The binding material is cement, the aggregate is the molecular sieve waste and sand, and the dispersant is water. Compression forming is performed under the condition of forming pressure of 18-25 MPa, the brick needs to be subjected to steam curing after being formed, the curing temperature is 45-75 DEG C, and the curing time is 12-72 h. Relying on the characteristics of large specific surface area and rich pore passage structures of molecular sieves, the water permeable brick filters and adsorbs pollutants, and the pollutants are blocked from penetrating through the water permeable brick.

Description

technical field [0001] The invention belongs to a brick and its preparation method, in particular to a permeable brick prepared from molecular sieve waste and its preparation method. Background technique [0002] Permeable brick is a basic pavement and building material, which has a wide range of application scenarios and a large amount of use. The permeable process of general permeable bricks has no adsorption or filtering effect, and the pollutants dispersed or dissolved on the surface can penetrate from one side to the other side. When used as a pavement material, the pollutants on the pavement can easily enter the ground through permeable bricks, causing groundwater pollution. Modulating the properties of permeable bricks to achieve the retention of pollutants in the permeable process can block the diffusion of pollutants and prevent secondary pollution, which has significant environmental protection value. [0003] Molecular sieve is a commonly used catalytic material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/08C04B18/04
CPCC04B18/0481C04B28/00C04B2111/00284C04B14/06C04B38/08C04B40/024Y02W30/91
Inventor 吉可明刘平荀家瑶
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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