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Method for producing autoclaved brick from foundry waste sand and acetylene sludge

A technology for casting waste sand and carbide slag, which is applied in the field of building materials and can solve problems such as undiscovered autoclaved bricks

Inactive Publication Date: 2017-02-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the literature search, no reports have been found on the use of foundry waste sand and carbide slag to prepare autoclaved bricks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Foundry waste sand and carbide slag autoclaved bricks are made of the following raw materials in parts by weight: 50 parts of foundry waste sand, 25 parts of carbide slag, 15 parts of fly ash, and 10 parts of water.

[0022] The specific steps are: the foundry waste sand, calcium carbide slag, and fly ash are respectively measured by the single-tube feeder and then sent to the single-bucket elevator to be transported to the twin-shaft mixer. After uniformity, the mixture is sent to the aging warehouse for 12 hours by belt conveyor. After aging, the mixture will enter the block forming machine through the disc feeder and belt conveyor to form bricks.

[0023] After the brick is formed, it is sent to the autoclave by an autoclave trolley and cured at 1.0MPa and 150°C for 6 hours. First, the temperature is raised from room temperature to 150°C for 1 hour, then the temperature is kept at a constant temperature for 4 hours, and then the temperature is lowered from...

Embodiment 2

[0025] Example 2: Foundry waste sand and carbide slag autoclaved bricks are made of the following raw materials in parts by weight: 65 parts of foundry waste sand, 20 parts of carbide slag, 5 parts of fly ash, and 10 parts of water.

[0026] The specific steps are: the foundry waste sand, calcium carbide slag, and fly ash are respectively measured by the single-tube feeder and then sent to the single-bucket elevator to be transported to the twin-shaft mixer. After uniformity, the mixture is sent to the aging warehouse for 12 hours by belt conveyor. After aging, the mixture will enter the block forming machine through the disc feeder and belt conveyor to form bricks.

[0027] After the brick is formed, it is sent to the autoclave by an autoclave trolley and cured at 1.0MPa and 150°C for 6 hours. First, the temperature is raised from room temperature to 150°C for 1 hour, then the temperature is kept at a constant temperature for 4 hours, and then the temperature is lowered from ...

Embodiment 3

[0029] Example 3: Foundry waste sand and carbide slag autoclaved bricks are made of the following raw materials in parts by weight: 50 parts of foundry waste sand, 30 parts of carbide slag, 10 parts of fly ash, and 10 parts of water.

[0030] The specific steps are: the foundry waste sand, calcium carbide slag, and fly ash are respectively measured by the single-tube feeder and then sent to the single-bucket elevator to be transported to the twin-shaft mixer. After uniformity, the mixture is sent to the aging warehouse for 12 hours by belt conveyor. After aging, the mixture will enter the block forming machine through the disc feeder and belt conveyor to form bricks.

[0031] After the brick is formed, it is sent to the autoclave by an autoclave trolley and cured at 1.0MPa and 150°C for 6 hours. First, the temperature is raised from room temperature to 150°C for 1 hour, then the temperature is kept at a constant temperature for 4 hours, and then the temperature is lowered from...

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Abstract

The invention relates to a method for producing an autoclaved brick from foundry waste sand and acetylene sludge, and belongs to the technical field of building materials. According to the method, the foundry waste sand and the acetylene sludge which pollute the environment are prepared into the autoclaved brick, a pozzolanic reaction is generated through the main ingredient Ca(OH)2 of the acetylene sludge and SiO2 and Al2O3 which are formed on the surface of the foundry waste sand under the high-temperature hydrothermal conditions to generate CSH gel, waste sand particles are bonded together, and then a green brick achieves the strength. According to the autoclaved brick prepared from the foundry waste sand and the acetylene sludge, the quality meets the quality requirement of the national standard 'autoclaved sand-lime brick' (GB11945-1999), and the significant social, economic and environment-friendly benefits are achieved.

Description

technical field [0001] The invention relates to a method for producing autoclaved bricks by using foundry waste sand and calcium carbide slag, belonging to the technical field of building materials. Background technique [0002] With the rapid development of my country's economy, a huge amount of industrial waste is generated every year. Foundry waste sand is the solid waste discharged from sand casting in the foundry industry. According to incomplete statistics, the annual production of foundry waste sand in my country reaches 10 million tons, occupying land for accumulation and destroying the ecological environment. [0003] Carbide slag is used by chemical companies to produce acetylene gas (C 2 h 2 ), polyvinyl chloride (PVC), polyvinyl alcohol (PVA) and other products, the gray-white industrial waste discharged, its main component is calcium hydroxide (Ca(OH) 2 ), showing strong alkalinity, and untreated stacking or landfilling will also cause serious pollution to ai...

Claims

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Application Information

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IPC IPC(8): C04B30/00
CPCC04B30/00C04B2201/50C04B18/0481C04B18/08
Inventor 林志伟郭荣鑫颜峰夏海廷马倩敏王峰宪
Owner KUNMING UNIV OF SCI & TECH
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