Method for preparing ecological concrete by synergistically utilizing coal chemical industry waste residues and waste water

A technology of ecological concrete and coal chemical industry, which is applied in the field of solid waste resource utilization and new building materials, and can solve the problems affecting the utilization technology of building materials and low concrete strength

Active Publication Date: 2021-07-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]Using coal gasification slag to produce building material products is the main research direction, making bricks, blocks, mixing cement or concrete, etc. are all based on the aggregate effect of coal gasification slag and Volcanic ash effect, but the overall high residual carbon characteristics of coal gasification slag will seriously affect its construction material utilization technology, and the strength of concrete is relatively low. Therefore, it is urgent to solve this technical problem in order to effectively utilize waste from the coal chemical industry

Method used

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  • Method for preparing ecological concrete by synergistically utilizing coal chemical industry waste residues and waste water

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Embodiment 1

[0037] A method for synergistically utilizing coal chemical waste residue and waste water to prepare ecological concrete, comprising the following steps:

[0038] (1) Dry the low-carbon gasification slag in a drying oven at 105°C, and grind it until the specific surface area is 320m 2 After / kg, add calcium hydroxide, low-carbon gasification slag and calcium hydroxide mass ratio are 19:1, obtain cementitious material;

[0039] (2) Dry the high-carbon gasification slag in a drying oven at 105°C, and grind it until the specific surface area is 320m 2 / kg, put it into a disc granulator for granulation treatment, and make raw meal balls with a diameter of 10mm. After aging for 24 hours, carry out two-stage calcination, specifically: heat up to 600°C at a rate of 10°C / min , keep warm for 30min; heat up to 1120°C at a rate of 20°C / min, keep warm for 30min; then cool naturally to below 50°C to obtain a bulk density of 928kg / m 3 , cylinder compressive strength 11.59MPa, light cerams...

Embodiment 2

[0042] A method for synergistically utilizing coal chemical waste residue and waste water to prepare ecological concrete, comprising the following steps:

[0043] (1) Dry the low-carbon gasification slag in a drying oven at 105°C, and grind it until the specific surface area is 320m 2 After / kg, add calcium hydroxide and sodium hydroxide, low-carbon gasification slag and calcium hydroxide and sodium hydroxide mass ratio are 9:1, obtain cementitious material;

[0044] (2) Dry the high-carbon gasification slag in a drying oven at 105°C, and grind it until the specific surface area is 320m 2 / kg, put it into a disc granulator for granulation treatment, and make raw meal balls with a diameter of 10mm. After aging for 24 hours, carry out two-stage calcination, specifically: heat up to 550°C at a rate of 10°C / min , keep warm for 30min; heat up to 1130°C at a rate of 20°C / min, keep warm for 30min; then cool naturally to below 50°C to obtain a bulk density of 920kg / m 3 , cylinder com...

Embodiment 3

[0047] A method for synergistically utilizing coal chemical waste residue and waste water to prepare ecological concrete, comprising the following steps:

[0048] (1) Dry the low-carbon gasification slag in a drying oven at 105°C, and grind it until the specific surface area is 320m 2 After adding Portland cement and sodium hydroxide, the mass ratio of low-carbon gasified slag to Portland cement and sodium hydroxide is 9:1 to obtain a cementitious material;

[0049] (2) Dry the high-carbon gasification slag in a drying oven at 105°C, and grind it until the specific surface area is 320m 2 / kg, put it into a disc granulator for granulation treatment, and make raw meal balls with a diameter of 10mm. After aging for 24 hours, carry out two-stage calcination, specifically: heat up to 550°C at a rate of 10°C / min , keep warm for 30min; heat up to 1130°C at a rate of 20°C / min, keep warm for 30min; then cool naturally to below 50°C to obtain a bulk density of 920kg / m 3 , cylinder com...

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Abstract

The invention discloses a method for preparing ecological concrete by synergistically utilizing coal chemical industry waste residues and wastewater. The method comprises the following steps: preparing a cementing material by using low-carbon coal gasification residues generated in a coal chemical industry process as a main cementing material and a small amount of excitant as an auxiliary material, sintering high-carbon coal gasification residues to prepare lightweight aggregate with light weight and high strength, adopting coal chemical industry high salinity wastewater as mixing water, proportioning according to a certain ratio to prepare the ecological concrete, and curing by using different curing systems to treat waste with waste so as to achieve the purposes of harmless treatment and resource utilization of coal chemical industry waste.

Description

technical field [0001] The invention belongs to the field of solid waste resource utilization and new building materials, and in particular relates to a method for synergistically utilizing coal chemical waste residue and waste water to prepare ecological concrete. Background technique [0002] With the rapid development of my country's industrial economy, my country's energy structure defects of "rich in coal, poor in oil, and low in gas" have gradually become prominent, making the dependence on coal mining and utilization increasing day by day. At present, the mainstream coal chemical technology uses coal gasification as a pillar to synthesize and produce various chemical products. However, the waste residue and wastewater produced in the coal gasification process are huge, complex in composition, and rich in toxic and harmful substances. Most of my country's coal-to-liquids projects are built in the west, which is rich in coal resources, and the ecological environment in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B28/02C04B18/02C04B18/06
CPCC04B7/243C04B28/02C04B18/027C04B18/065C04B2111/00017C04B22/0046C04B18/023Y02W30/91Y02P40/10
Inventor 李辉吴锋白云马旭东
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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