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A kind of cementitious material using coal gangue as raw material and preparation method thereof

A technology of cementitious materials and coal gangue, which is applied in the direction of cement production, etc., can solve the problems of occupying land resources, weathered coal gangue not being effectively used, and polluting the atmosphere

Active Publication Date: 2021-05-04
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive utilization rate of coal gangue in my country is only 64%, which is mainly used for power generation fuel, production of building materials, land reclamation and subsidence backfill, etc. A large amount of weathered coal gangue has not been effectively utilized
If a large amount of weathered coal gangue is not treated, it will not only occupy a large amount of land resources, but also generate dust and pollute the atmosphere. If it is discharged into the water system, it will cause river silting. Causing fires, landslides and other disasters

Method used

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  • A kind of cementitious material using coal gangue as raw material and preparation method thereof
  • A kind of cementitious material using coal gangue as raw material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A cementitious material (by mass parts) using coal gangue as raw material contains the following components:

[0022] 75 parts of coal gangue

[0023] Quicklime 25 parts

[0024] Sodium hydroxide 1.3 parts

[0025] Digestion water 50 parts

[0026] Forming water 40 parts

[0027] Grind the weathered coal gangue to 4.5% of the 80 μm sieve, and then microwave activation for 5 minutes to form activated coal gangue powder. Mix 75 parts of activated coal gangue powder, 25 parts of quicklime, 1.3 parts of sodium hydroxide, and 50 parts of water. Digest at room temperature for 6h. Add 40 parts of water to the digested raw materials to form pellets, put the pelleted regular samples into a steam curing box at 97°C for 12 hours, and then put the steamed materials into a kiln for calcination at 800°C for 1 hour, and then cool them quickly. Take 92 parts of clinker, mix with 8 parts of natural gypsum and 0.5 parts of polycarboxylate superplasticizer, mix evenly, and grind it w...

Embodiment 2

[0029] A cementitious material (by mass parts) using coal gangue as raw material contains the following components:

[0030] Coal gangue 70 parts

[0031] Quicklime 30 parts

[0032] Sodium Sulfate 2 parts

[0033] Digestion water 50 parts

[0034] Forming water 40 parts

[0035] Grind the weathered coal gangue to 4.0% of the 80 μm sieve, and then microwave activation for 4 minutes to form activated coal gangue powder. Mix 70 parts of activated coal gangue powder, 30 parts of quicklime, 2 parts of sodium sulfate, and 50 parts of water evenly. Digest at room temperature for 6h. Add 40 parts of water to the digested raw materials to form pellets, put the pelleted regular samples into a steam curing box at 99°C for 12 hours, and then put the steamed materials into a kiln for calcination at 750°C for 1 hour, and then cool them quickly. Take 94 parts of clinker, mix with 6 parts of natural gypsum and 1.0 part of calcium lignosulfonate, mix evenly, and grind it with ultra-fine ...

Embodiment 3

[0037] A cementitious material (by mass parts) using coal gangue as raw material contains the following components:

[0038] 65 parts of coal gangue

[0039] Quicklime 35 parts

[0040] Sodium hydroxide 1.94 parts

[0041] Digestion water 50 parts

[0042] Forming water 40 parts

[0043] Grind the weathered gangue to 4.4% of the 80 μm sieve, and then activate it by microwave for 8 minutes to form activated gangue powder. Mix 65 parts of activated coal gangue powder, 35 parts of quicklime, 1.94 parts of sodium hydroxide, and 50 parts of water. Digest at room temperature for 6h. Add 40 parts of water to the digested raw materials to form pellets, put the pelleted regular samples into a steam curing box at 97°C for 12 hours, and then put the steamed materials into a kiln for calcination at 850°C for 0.5 hours, and then cool them down quickly. Take 93 parts of clinker, mix with 7 parts of natural gypsum and 1.5 parts of nano-based superplasticizer, mix them evenly, and grind ...

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Abstract

The invention discloses a cementitious material using coal gangue as a raw material and a preparation method thereof. The cementitious material contains the following components in parts by mass: 92-95 parts of clinker, 3-7 parts of gypsum and 0.5 parts of water reducer ~1.5 parts; wherein, in parts by mass, the clinker raw material includes the following components: 60-75 parts of activated coal gangue powder, 25-40 parts of quicklime, 0.5-2 parts of activator, and 70-90 parts of water. Coal gangue is mechanically-microwave compound activated, mixed evenly with quicklime, chemically strengthened, hydrothermally synthesized, and low-temperature calcined, and ground with ultra-fine cement to obtain a new type of cementitious material. The invention utilizes a large amount of stored coal gangue to reduce the land occupied by the coal gangue; it can also save natural resources and effectively solve the deterioration of the ecological environment caused by the mining of cement raw materials; the preparation method is simple, the energy consumption is low, the condensation is fast, the strength is high, and the corrosion resistance The strength of the cementitious material at each age reaches the corresponding strength requirements of P·F 32.5 cement.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cementitious material using coal gangue as a raw material and a preparation method thereof. Background technique [0002] At present, there are about 2,600 large-scale coal gangue dumps in my country, covering an area of ​​about 1.5×10 8 m 2 , the total amount of stored coal gangue exceeds 5 billion tons, and is still increasing at a rate of 150 million to 200 million tons per year. However, the comprehensive utilization rate of coal gangue in my country is only 64%, which is mainly used for power generation fuel, production of building materials, land reclamation and subsidence backfill, etc. A large amount of weathered coal gangue has not been effectively utilized. If a large amount of weathered coal gangue is not treated, it will not only occupy a large amount of land resources, but also generate dust and pollute the atmosphere. If it is discharged ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/14
CPCC04B7/14Y02P40/10
Inventor 龚泳帆刘淼葛晨杨鼎宜张鸣
Owner YANGZHOU UNIV
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