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Low-shrinkage early-strength mine filling gel material for superfine iron tailings

A technology of mine filling and cementitious materials, applied in cement production and other directions, can solve the problems of large shrinkage, long setting time, and low early strength, and achieve the effects of improving water retention, reducing the amount of additives, and improving early strength.

Pending Publication Date: 2019-07-26
HEBEI JINTAICHENG BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a low-shrinkage early-strength mine filling cementitious material for ultra-fine iron tailings sand, which solves the problem of large shrinkage and long setting time of the slag-based filling material in the prior art under low slurry concentration filling conditions , Low early strength and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The raw materials are composed and proportioned as 57.3wt% slag powder, 10wt% Portland cement clinker, 10wt% steel slag powder, 15wt% desulfurized gypsum, 5wt% alkaline activator, 1.2wt% early strength agent, 0.5wt% The PVA fibers with a length of 4mm and 1wt% suspending agent are mixed evenly to fill the gelling material.

[0033] The filling cementitious materials with different lime-sand ratios (1:5, 1:10) and iron tailings were evenly mixed to prepare low-shrinkage early-strength mine filling slurry. Among them: the gradation of iron tailings is 10.75% +60 mesh, 19.09% +100 mesh, 42.82% -100+200 mesh, 9.68% -200+300 mesh, 7.13% -300+400 mesh, and -400 mesh at 10.53%.

[0034] The low-shrinkage early-strength mine filling slurry prepared above is pumped into the goaf for filling, wherein:

[0035] The filling cementitious material with the ratio of lime to sand (1:5) is mixed with iron tailing sand evenly to prepare low-shrinkage early-strength mine filling slurry....

Embodiment 2

[0046] The raw materials are composed and proportioned as 59.3wt% slag powder, 10wt% portland cement clinker, 10wt% steel slag powder, 15wt% desulfurized gypsum, 3wt% alkaline activator, 1.5wt% early strength agent, 0.2wt% The PVA fibers with a length of 4mm and 1wt% suspending agent are mixed evenly to fill the gelling material.

[0047] Low shrinkage early strength mine filling slurry was prepared by mixing filling cementitious materials with different lime-sand ratios (1:5) and iron tailings sand evenly. Among them: the gradation of iron tailings is 23.30% of +100 mesh, 22.09% of -100+200 mesh, 5.82% of -200+300 mesh, 14.54% of -300+400 mesh, and 34.25% of -400 mesh .

[0048] The low-shrinkage early-strength mine filling slurry prepared above is pumped into the goaf for filling, wherein:

[0049] The filling cementitious material with the ratio of lime to sand (1:5) is mixed with iron tailing sand evenly to prepare low-shrinkage early-strength mine filling slurry. The ir...

Embodiment 3

[0058] The raw materials are composed and proportioned as 56wt% slag powder, 8wt% Portland cement clinker, 20wt% steel slag powder, 12wt% desulfurized gypsum, 2wt% alkaline activator, 1.0wt% early strength agent, 0.2wt% PVA fibers with a length of 4mm and 0.8wt% suspending agent are uniformly mixed to fill the gelling material.

[0059] The filling cementitious materials with different lime-sand ratios (1:10, 1:15) were mixed evenly with iron tailings sand to prepare low-shrinkage and early-strength mine filling slurry. Among them: the gradation of iron tailings is 21.75% +60 mesh, 30.99% +100 mesh, 25.99% -100+200 mesh, 4.42% -200+300 mesh, 4.23% -300+400 mesh, and -400 mesh at 13.1%.

[0060] The low-shrinkage early-strength mine filling slurry prepared above is pumped into the goaf for filling, wherein:

[0061] The filling cementitious material with the ratio of lime to sand (1:10) is mixed with iron tailing sand evenly to prepare low-shrinkage early-strength mine fillin...

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Abstract

The invention provides a low-shrinkage early-strength mine filling gel material for superfine iron tailings and belongs to the technical field of metal mine underground filling. The low-shrinkage early-strength mine filling gel material comprises, by weight, 50-90% of mineral residue powder, 5-25% of cement clinker, 1-30% of slag powder, 0-15% of gypsum, 0.5-10% of an alkaline activator, 0-10% ofan early strength agent, 0.1-10% of an anti-cracking material, and 0.5-10% of a suspending agent. Low-shrinkage early-strength mine filling slurry with effectively reduced usage of additives, good mobility and high early strength is finally acquired by: studying the functionality of mine filling gel materials, selecting mineral residue powder, cement clinker, slag powder, gypsum, the alkaline activator, the early strength agent, the anti-cracking material and the suspending agent as the mine filling gel materials, and adaptively studying their ratio. The low-shrinkage early-strength mine filling slurry has the advantages of good strength, good size stability and the like, and all the properties exceed those of a cement material.

Description

technical field [0001] The invention relates to the technical field of underground filling in metal mines, in particular to a low-shrinkage early-strength mine filling cementitious material used for ultrafine iron tailings sand. Background technique [0002] The filling mining method refers to the mining method of filling the goaf with filling materials while carrying ore falling, transporting 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, Gebi aggregates, and quarrying from surface gates. [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 prepare...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B12/00C04B28/04
CPCC04B7/243C04B12/005C04B28/04C04B2111/70C04B2201/50C04B18/12Y02P40/10
Inventor 郝军中汤畅胡杰的郝军军温煦佘亮
Owner HEBEI JINTAICHENG BUILDING MATERIAL
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