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Preparation method of gangue base mine cemented filling material

A technology for cementing filling materials and coal gangue, applied in the field of mine filling materials, can solve the problems of less than 20% utilization rate of coal gangue, restricting the forward development of coal mine filling, unstable transportation performance, etc. The effect of previous development and broadening of applications

Active Publication Date: 2015-12-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the utilization of coal gangue mainly includes brick making, power generation, etc., using the calorific value of coal gangue itself, and directly using it after crushing to make blocks, concrete aggregates, backfilling mine goafs or paving materials, etc. , and the similar properties of coal gangue to clay are also used to replace some or all of the clay to produce cement. It is difficult to meet the requirements of construction projects
The utilization rate of coal gangue is still less than 20%.
The advantages of filling mining technology in preventing large-scale surface subsidence, liberating "three-down" coal pressing, improving resource recovery rate, and solving the problem of coal gangue stacking on the ground are becoming more and more prominent. At present, the main filling material is Portland cement as the cementitious material. , using crushed coal gangue as aggregate is not only expensive, but also has unstable conveying performance, which seriously restricts the development of coal mine filling. Therefore, it is necessary to develop a new cementitious material to replace cement to promote cemented filling mining. technological development

Method used

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  • Preparation method of gangue base mine cemented filling material
  • Preparation method of gangue base mine cemented filling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) First, crush and screen large pieces of coal gangue with a jaw crusher, and control the particle size of coal gangue within the range of 0 to 5mm.

[0036] The effective chemical composition of the gangue is: SiO 2 : 35.46%, Al 2 o 3 : 16.11%

[0037] (2) Accurately weigh 18kg of 0-5mm coal gangue and grind it in a ball mill for 45 minutes, and then sieve it with 200-mesh and 300-mesh standard sieves to obtain coal gangue powder with a particle size of less than 300 mesh for use.

[0038] (3) Put all 18kg of coal gangue powder in step (2) into an industrial furnace, heat up to 750°C for calcination, and calcine at a constant temperature of 750°C for 2 hours.

[0039] (4) The calcined coal gangue in step (3) is taken out and rapidly cooled for later use.

[0040] (5) Add 1.62kg of Al to the gangue powder in step (4) 2 (SO 4 ) 3 , 0.54kg of NaOH, 0.84kg of CaSO 4 2H 2 O Powdered chemical reagents of analytical grade, and pre-mixed for 30s, so that the compone...

Embodiment 2

[0046] (1) First, crush and screen large pieces of coal gangue with a jaw crusher, and control the particle size of coal gangue within the range of 0 to 5mm.

[0047] The effective chemical composition of the gangue is: SiO 2 : 50.33%, Al 2 o 3 : 23.46%

[0048] (2) Accurately weigh 15kg of 0-5mm coal gangue and grind it in a ball mill for 60 minutes, and then sieve it with 200-mesh and 300-mesh standard sieves to obtain coal gangue powder with a particle size of less than 300 mesh for use.

[0049](3) Put all 15kg of coal gangue powder in step (2) into an industrial furnace, heat up to 700°C for calcination, and calcine at a constant temperature of 700°C for 2.5 hours.

[0050] (4) The calcined coal gangue in step (3) is taken out and rapidly cooled for later use.

[0051] (5) Add 1.20kg of Al to the gangue powder in step (4) 2 (SO 4 ) 3 , 0.60kg of NaOH, 0.45kg of CaSO 4 2H 2 O Powdered chemical reagents of analytical grade, and pre-mixed for 30s, so that the compon...

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Abstract

The invention discloses a preparation method of a gangue base mine cemented filling material, and belongs to the field of mine filling materials. Cementing activity hidden in gangue is stimulated in a compound stimulation way, cement is partially replaced with the cementing activity to serve as a cementing material for cemented filling mining, and then the material is mixed with fine particle size gangue to be prepared into the mine cemented filling material. The process for preparing the mine cemented filling material is simple, large proportion dosage of gangue powder and cement is realized, the filling material has excellent mechanical property and stable conveying property, no segregation or no bleeding exists, the application of gangue in mine filling is broadened, the mine filling cost is reduced, the material conveying property is improved, at the same time, the purpose of effective use of gangue is realized, and mine filling is promoted to develop forward.

Description

technical field [0001] The invention relates to a preparation method of a coal gangue-based mine cemented filling material, which belongs to the field of mine filling materials. Background technique [0002] Coal gangue is the solid waste discharged during coal mining and washing. It is one of the largest industrial solid wastes in my country. It has accumulated nearly 4 billion tons, occupies more than 10,000 hectares of land, and still costs 100 million The number of tons or so has increased dramatically year by year. A large amount of coal gangue not only occupies arable land, but also easily weathers and spontaneously combusts, causing air, soil and water pollution, and even causing serious geological disasters, which has extremely bad effects on the ecological environment and social environment. Therefore, the disposal and effective utilization of coal gangue has become an urgent problem to be solved. [0003] At present, the utilization of coal gangue mainly includes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/12C04B22/14
CPCY02W30/91
Inventor 郭育霞冯国瑞刘国艳戚庭野杜献杰宋凯歌张聪俐
Owner TAIYUAN UNIV OF TECH
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