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Coal mine early strength type low-cost filling material and preparation method thereof

A filling material, early-strength type technology, applied in coal mine early-strength low-cost filling material and its preparation, in the field of coal mine filling materials, can solve the problem of high cost of coal mine filling materials, and achieve low cost, high early strength and low cost Effect

Active Publication Date: 2017-05-24
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of high cost of coal mine filling materials, while taking into account the conveying performance, early strength and slurry bleeding rate, the invention discloses a coal mine early-strength type low-cost filling material and its preparation method

Method used

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  • Coal mine early strength type low-cost filling material and preparation method thereof
  • Coal mine early strength type low-cost filling material and preparation method thereof
  • Coal mine early strength type low-cost filling material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In Example 1, Example 2, and Example 3, the coal gangue for excavation was all taken from the gangue hill of Lugou Coal Mine of Zhengzhou Coal Group, mainly sandstone coal gangue and limestone coal gangue, and its chemical composition is shown in Table 1. The bottom ash was taken from Zhengzhou Coal Group Dongfeng Power Plant, and its chemical composition is shown in Table 2.

[0050] Table 1 Main chemical composition of coal gangue excavated in Lugou Mine (unit %)

[0051] type SiO 2

al 2 o 3

CaO Fe 2 o 3

MgO Sandstone coal gangue 83.57 1.28 6.62 1.12 0.02 limestone coal gangue 18.34 2.51 59.33 5.24 3.40

[0052] Table 2 Bottom ash chemical composition (unit %)

[0053] SiO 2

Al 2 o 3

Fe 2 o 3

CaO MgO SO 3

TiO MnO 49.36 27.11 11.48 5.41 2.13 1.01 0.77 0.04

[0054] The Portland cement clinker in the cement was obtained from Zhengzhou Longli Cement Pl...

Embodiment 2

[0074] Put the sulphoaluminate cement clinker and Portland cement clinker into the ball mill to grind for 45 minutes, so that the specific surface area of ​​the powder reaches 400m 2 / kg. Put the dry fly ash into the ball mill and grind for 15 minutes until the specific surface area of ​​the powder reaches 400m 2 / kg, put the water-quenched slag into the ball mill and grind for 45min until the specific surface area of ​​the powder reaches 350m 2 / kg, put the desulfurized gypsum into the ball mill and grind for 35min until the specific surface area of ​​the powder reaches 360m 2 / kg.

[0075] Mix the ground dry fly ash, water-quenched slag, and Portland cement clinker according to the mass ratio of 2:1:1. The total mass of the three accounts for 15.4% of the filling material, and add the ground sulfur aluminum Salt cement clinker and desulfurized gypsum are mixed evenly again, and the mass ratio of sulphoaluminate cement clinker to desulfurized gypsum is 1:1, and the sum of ...

Embodiment 3

[0080] Put the sulphoaluminate cement clinker and Portland cement clinker into the ball mill to grind for 38 minutes, so that the specific surface area of ​​the powder reaches 380m 2 / kg. Put the dry fly ash into the ball mill and grind for 19 minutes until the specific surface area of ​​the powder reaches 425m 2 / kg, put the water-quenched slag into the ball mill and grind for 50min until the specific surface area of ​​the powder reaches 380m 2 / kg, put the desulfurized gypsum into the ball mill and grind for 30min until the specific surface area of ​​the powder reaches 340m 2 / kg.

[0081] Mix the ground dry fly ash, water-quenched slag, and Portland cement clinker according to the mass ratio of 2:1:1. The total mass of the three accounts for 15.4% of the filling material, and add the ground sulfur aluminum Salt cement clinker and desulfurized gypsum are mixed evenly again, and the mass ratio of sulphoaluminate cement clinker to desulfurized gypsum is 1:1, and the sum of ...

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Abstract

The invention belongs to the technical field of a coal mine, and particularly relates to a coal mine early strength type low-cost filling material and a preparation method thereof. The filling material is prepared from water, a bonding material, an excitant, an auxiliary excitant and a mixture of tunneling waste rock and furnace bottom ash, wherein the water accounts for 21 to 23 percent of the filling material; the bonding material is a mixture of portland cement clinker, fly ash and water quenched ore slag, and accounts for 15.2 to 19.5 percent of the filling material; the excitant accounts for 0.5 to 0.9 percent of the bonding material; the auxiliary excitant is a mixture of sulphoaluminate cement clinker and desulfurized gypsum, and accounts for 2.5 percent of the bonding material; the balance is the mixture of the tunneling waste rock and the furnace bottom ash. The coal mine early strength type low-cost filling material has the advantages that the early strength is high; the flowing performance is good; the bleeding rate is low; the requirements of most coal mines on the performance of the filling material can be met; solid waste and mine waste water account for 93 percent or more of the total mass of materials in the filling material, so that the cost of the filling material is reduced; the waste is sufficiently utilized; good economic benefits and environment benefits are realized.

Description

technical field [0001] The invention belongs to the technical field of coal mines, and relates to a coal mine filling material, in particular to a coal mine early-strength low-cost filling material and a preparation method thereof. Background technique [0002] Coal gangue is a by-product of coal mining, tunneling and mineral processing. At present, the stock of coal gangue in my country is more than 4 billion tons (more than 40% of the total solid waste in my country). Cultivated land, in some cases gangue hills will spontaneously ignite and produce a variety of harmful gases, which seriously endanger human health. Coal gangue with a certain calorific value can be used for power generation, and a large amount of sandstone and limestone gangue produced during the excavation of rock roadways But rarely used. [0003] Fly ash is a pozzolanic solid waste produced during coal-fired power generation in thermal power plants and smelting in steel plants. [0004] The annual accumul...

Claims

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Application Information

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IPC IPC(8): C04B28/08
CPCC04B28/08C04B2111/00724C04B7/26C04B22/002C04B18/025C04B22/145C04B22/0046C04B22/124C04B24/122C04B18/12C04B18/06
Inventor 卢前明张元馨刘文永韩红强孙文标
Owner HENAN INST OF ENG
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