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A production process for preparing alkali cementitious material from coal gangue

A technology of alkali cementitious material and production process, applied in cement production and other directions, can solve the problems of poor performance of alkali cementitious material and low comprehensive utilization rate of coal gangue, so as to reduce the agglomeration effect, improve the degree of amorphousness, and promote the activity of Effect

Active Publication Date: 2022-08-05
王庆乐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, in view of the above content, the present invention provides a production process for preparing alkali cementitious materials from coal gangue, which solves the problems of low comprehensive utilization rate of existing coal gangue and poor performance of prepared alkali cementitious materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A production process for preparing alkali cementitious material from coal gangue, comprising the following steps:

[0031] (1) The coal gangue is sent to the hydraulic jaw crusher for crushing treatment, then ball-milled in a ball mill for 2 hours, and sieved to obtain coal gangue powder with a fineness of less than 0.25mm;

[0032] (2) put the coal gangue powder into the mixed acid solution with a concentration of 0.8mol / L, the solid-liquid ratio is 1:10, stir and mix for 30h, and stand for 15 days after suction filtration and drying;

[0033] The mixed acid is compounded by sulfamic acid and succinic acid in a mass ratio of 0.8:1.2, and gamma-(2,3-glycidoxy)propyltrimethyl with 2% mass of coal gangue powder is added to the mixed acid solution. oxysilane;

[0034] (3) after mixing the coal gangue powder obtained in step (2) and the salt mud at a mass ratio of 5:1, calcining at a temperature of 580 ° C for 6 hours, cooling and then putting it into a ball mill for secon...

Embodiment 2

[0041] A production process for preparing alkali cementitious material from coal gangue, comprising the following steps:

[0042](1) The coal gangue is sent to the hydraulic jaw crusher for crushing treatment, then ball-milled in a ball mill for 2 hours, and sieved to obtain coal gangue powder with a fineness of less than 0.25mm;

[0043] (2) put the coal gangue powder into the mixed acid solution with a concentration of 1.2mol / L, the solid-liquid ratio is 1:10, stir and mix for 20h, and then stand for 10 days after suction filtration and drying;

[0044] The mixed acid is compounded by sulfamic acid and succinic acid in a mass ratio of 1:1, and γ-(2,3-glycidoxy)propyltrimethyl with 4% by mass of coal gangue powder is added to the mixed acid solution. oxysilane;

[0045] (3) after mixing the coal gangue powder obtained in step (2) and the salt mud at a mass ratio of 5:1, calcining at a temperature of 620 ° C for 5 hours, cooling and then putting it into a ball mill for second...

Embodiment 3

[0052] A production process for preparing alkali cementitious material from coal gangue, comprising the following steps:

[0053] (1) The coal gangue is sent to the hydraulic jaw crusher for crushing treatment, then ball-milled in a ball mill for 2 hours, and sieved to obtain coal gangue powder with a fineness of less than 0.25mm;

[0054] (2) put the coal gangue powder into the mixed acid solution with a concentration of 1.5mol / L, the solid-liquid ratio is 1:10, stir and mix for 10h, and stand for 7 days after suction filtration and drying;

[0055] The mixed acid is compounded by sulfamic acid and succinic acid in a mass ratio of 2:1.6, and γ-(2,3-glycidoxy)propyltrimethyl with 6% by mass of coal gangue powder is added to the mixed acid solution. oxysilane;

[0056] (3) after mixing the coal gangue powder obtained in step (2) and the salt mud at a mass ratio of 5:1, calcining at a temperature of 650 ° C for 3 hours, cooling and then putting it into a ball mill for secondary...

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Abstract

The invention relates to the field of solid waste resource utilization, and provides a production process for preparing alkali cementitious materials from coal gangue, comprising the following steps: (1) sending the coal gangue for crushing, ball milling, and sieving to obtain coal gangue powder; (2) Put the coal gangue powder into the mixed acid solution, stir evenly, let it stand for several days, suction filter and dry; (3) mix the coal gangue powder obtained in step (2) with the salt mud, calcine at high temperature, and then ball-mill for a second time after cooling , sieve to obtain mixed powder; (4) weigh each raw material by the following parts by weight: 50-80 parts of mixed powder, 20-40 parts of slag powder, 4-8 parts of activator, 24-36 parts of water; (5 ) Mix the raw materials evenly to obtain the alkali gelling slurry; (6) inject the alkali gelling slurry into the mold and vibrate for molding, cure at normal temperature until demoulding, and steam at 66-72° C. for 8 hours. The invention not only solves the problems of resource waste and environmental pollution of coal gangue waste, but also prepares an alkali gelling material with excellent performance.

Description

technical field [0001] The invention relates to the technical field of solid waste resource utilization, in particular to a production process for preparing alkali cementitious materials from coal gangue. Background technique [0002] Alkali cementitious materials are considered to be a low carbon cementitious material because of their low energy consumption and low emissions in the preparation process, and can provide similar properties to Portland cement-based cementitious materials. Alkali cementitious materials are very different from traditional cementitious materials in terms of reaction mechanism and preparation process. . [0003] Coal gangue is a waste rock separated from coal mining and washing, and it is one of the largest industrial solid wastes in China. The disposal of coal gangue by landfill not only occupies a large amount of land resources, but also the escape or leaching of sulfur-containing substances in coal gangue is likely to cause pollution to the at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/14C04B7/36C04B7/38C04B7/52C04B24/12C04B103/52
CPCC04B7/243C04B7/1535C04B7/36C04B7/38C04B7/52C04B40/0039C04B2103/52C04B24/124C04B24/026Y02P40/10
Inventor 王庆乐
Owner 王庆乐
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