Production process for preparing alkali cementing material from coal gangue

A technology of alkali cementing material and production process, which is applied in the direction of cement production, etc. It can solve the problems of poor performance of alkali cementing material and low comprehensive utilization rate of coal gangue, so as to weaken the agglomeration effect, improve the degree of amorphousness, and inhibit agglomeration Effect

Active Publication Date: 2021-08-06
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

[0031] A kind of coal gangue prepares the production technology of alkali cementitious material, comprises the following steps:

[0032] (1) sending coal gangue into a hydraulic jaw crusher for crushing, then ball milling in a ball mill for 2 hours, and sieving to obtain coal gangue powder with a fineness below 0.25mm;

[0033] (2) putting coal gangue powder into the mixed acid solution whose concentration is 0.8mol / L, the solid-to-liquid ratio is 1:10, stirring and mixing for 30 hours, and suction filtering and drying after standing for 15 days;

[0034] The mixed acid is compounded by sulfamic acid and succinic acid at a mass ratio of 0.8:1.2, and γ-(2,3-glycidyloxy)propyl trimethyl with 2% of the mass of coal gangue powder is added to the mixed acid solution Oxysilane;

[0035] (3) After mixing the gangue powder and salt mud obtained in step (2) at a mass ratio of 5:1, calcining at a temperature of 580°C for 6 hours, then putting it into a ball mill for secondary ball mill...

Embodiment 2

[0042] A kind of coal gangue prepares the production technology of alkali cementitious material, comprises the following steps:

[0043](1) sending coal gangue into a hydraulic jaw crusher for crushing, then ball milling in a ball mill for 2 hours, and sieving to obtain coal gangue powder with a fineness below 0.25mm;

[0044] (2) put coal gangue powder into the mixed acid solution whose concentration is 1.2mol / L, the solid-to-liquid ratio is 1:10, stir and mix for 20h, leave to stand for 10 days and then suction filter and dry;

[0045] The mixed acid is compounded by sulfamic acid and succinic acid at a mass ratio of 1:1, and γ-(2,3-glycidyloxy)propyltrimethyl trimethylol with 4% of the mass of coal gangue powder is added to the mixed acid solution Oxysilane;

[0046] (3) After mixing the gangue powder and salt mud obtained in step (2) at a mass ratio of 5:1, calcining at a temperature of 620°C for 5 hours, cooling and then putting them into a ball mill for secondary ball m...

Embodiment 3

[0053] A kind of coal gangue prepares the production technology of alkali cementitious material, comprises the following steps:

[0054] (1) sending coal gangue into a hydraulic jaw crusher for crushing, then ball milling in a ball mill for 2 hours, and sieving to obtain coal gangue powder with a fineness below 0.25 mm;

[0055] (2) putting coal gangue powder into a mixed acid solution whose concentration is 1.5mol / L, the solid-to-liquid ratio is 1:10, stirring and mixing for 10 hours, leaving it to stand for 7 days and then suctioning and drying;

[0056] The mixed acid is compounded by sulfamic acid and succinic acid in a mass ratio of 2:1.6, and γ-(2,3-glycidyloxy)propyltrimethyl trimethylol with 6% of the mass of coal gangue powder is added to the mixed acid solution Oxysilane;

[0057] (3) After mixing the gangue powder and salt mud obtained in step (2) at a mass ratio of 5:1, calcining at a temperature of 650°C for 3 hours, cooling and then putting them into a ball mill...

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Abstract

The invention relates to the field of solid waste resource utilization, and provides a production process for preparing an alkali cementing material from coal gangue, which comprises the following steps: (1) crushing, ball-milling and sieving coal gangue to obtain coal gangue powder; (2) putting the coal gangue powder into the mixed acid solution, uniformly stirring, standing for several days, carrying out suction filtration, and drying; (3) mixing the coal gangue powder obtained in the step (2) with salty mud, calcining at high temperature, cooling, carrying out secondary ball milling, and sieving to obtain mixed powder; (4) weighing the following raw materials in parts by weight: 50-80 parts of the mixed powder, 20-40 parts of slag powder, 4-8 parts of an exciting agent and 24-36 parts of water; (5) uniformly mixing the raw materials to obtain alkali gelling slurry; and (6) injecting the alkali gelling slurry into a mold, carrying out vibration molding, curing at normal temperature until demolding, and carrying out steam curing at 66-72 DEG C for 8 hours. According to the preparation method, the problems of resource waste and environmental pollution of the coal gangue waste are solved, and the alkali cementing material with excellent performance is prepared.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a production process for preparing an alkali cementitious material from coal gangue. Background technique [0002] Alkali cementitious materials are considered as a low-carbon cementitious material because of their low energy consumption and low emissions during the preparation process, and they can provide similar properties to Portland cement-based cementitious materials. Alkali gelling materials are very different from traditional gelling materials in terms of reaction mechanism and preparation process. It is produced by using silica-alumina materials with pozzolanic activity or potential hydraulicity as raw materials and reacting with alkali activators. . [0003] Coal gangue is the waste rock separated during the coal mining and washing process, and it is one of the industrial solid wastes with the largest discharge in my country. Landfilling co...

Claims

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Application Information

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Patent Type & Authority Applications(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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