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Quick-setting filling cementing material

A technology of cementitious materials and accelerators, applied in cement production and other directions, can solve the problems of low early strength, large shrinkage, and long setting time.

Inactive Publication Date: 2020-04-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a fast-setting filling cementitious material, which solves the technical problems of large shrinkage, long setting time, and low early strength of the prior art slag-based filling material under the condition of low-concentration slurry filling.

Method used

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Embodiment 1

[0023] The raw materials are composed and proportioned as 55 parts of slag powder, 10 parts of cement clinker, 3 parts of bentonite, 10 parts of steel slag powder, 15 parts of modified gypsum, 5 parts of alkaline activator, 2 parts of coagulant, 3 parts of reducing Water agent, 0.5 part of polyvinyl alcohol fiber with a length of 4 mm, and 1 part of suspending agent are mixed evenly to form a quick-setting filling gelling material.

[0024] The fast-setting filling cementitious material with different lime-sand ratios (1:5, 1:10) and ultra-fine copper mine tailings were evenly mixed to prepare low-retraction and early-strength fast-setting mine filling slurry. Among them: the gradation of ultra-fine copper tailings is 10.75% +60 mesh, 19.09% +100 mesh, 42.82% -100+200 mesh, 9.68% -200+300 mesh, 7.13% -300+ mesh 400 mesh, and 10.53% of -400 mesh.

[0025] The low-retraction and fast-setting mine filling slurry prepared above is pumped into the goaf for filling, in which: fast-...

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PUM

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Abstract

The invention discloses a quick-setting filling cementing material and a preparation method thereof. The composition comprises the following components in parts by weight: 40-90 parts of slag powder;6-24 parts of cement clinker; 2-18 parts of bentonite, 2-28 parts of steel slag powder; 0-15 parts of modified gypsum; 0.5-10 parts of an alkaline excitant; 0-10 parts of a coagulant; 1-3 parts of a water reducing agent; 0.2-8 parts of an anti-cracking material; and 0.5-10 parts of a suspension agent. The quick-setting filling cementing material can effectively reduce the dosage of an additive, has good flowing property and relatively high early strength, has good retention strength and volume stability, is short in cementing time, quick in early strength increase and slow in later strength increase, and is simple in process and wide in material source.

Description

technical field [0001] The invention relates to the technical field of underground filling in metal mines, in particular to a fast-setting filling cementitious material. Background technique [0002] The filling mining method refers to the mining method of filling the gob with filling materials while accompanying ore falling, transportation and other operations. It can be divided into two methods: cemented filling and non-cemented filling. Among them, cemented filling is widely used, and the sources of materials are waste rocks accumulated on the surface, waste rocks beside excavation pits, tailings from mineral processing plants, slag from smelters, Gobi aggregates, and quarrying from the surface. [0003] With the wide application of filling mining method in metal mines, in order to reduce the production cost and improve the safety of mining after filling, most of the filling materials for cemented filling are prepared from tailings from the concentrator and slag from the ...

Claims

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Application Information

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IPC IPC(8): C04B7/21C04B28/08C04B111/34
CPCC04B7/1535C04B28/082C04B2111/00724C04B2111/346C04B2201/50C04B18/12Y02P40/10
Inventor 郝瑞卿靳瑾李文璞
Owner TAIYUAN UNIV OF TECH
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