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Underground filling mortar used for mine and prepared from steel slag sand and beneficiation waste

A technology of steel slag sand and waste, which is applied in the field of building materials, can solve the problems of lack of fine aggregate and the inability to use ultra-fine steel slag sand, etc., and achieve the effects of good fluidity, excellent filling effect, strong coagulation and hardness

Active Publication Date: 2020-05-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ultra-fine steel slag sand cannot be used as fine aggregate in the particle size gradation of steel slag sand, resulting in the lack of fine aggregate in the ultra-fine particle size range in the steel slag sand particle size gradation

Method used

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  • Underground filling mortar used for mine and prepared from steel slag sand and beneficiation waste
  • Underground filling mortar used for mine and prepared from steel slag sand and beneficiation waste
  • Underground filling mortar used for mine and prepared from steel slag sand and beneficiation waste

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Experimental program
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Effect test

Embodiment 1

[0039] The invention relates to a mortar for underground filling of a mine, which includes composite cementitious material, fine aggregate and water.

[0040] By weight, 17 parts of iron tailings powder, 62 parts of fine slag powder, 11 parts of quicklime and 10 parts of desulfurized ash are mixed as a composite cementitious material.

[0041] Take 360 ​​parts of ultra-fine iron tailings sand and 240 parts of steel slag sand and mix them as fine aggregate.

[0042] The composite cementitious material, water and fine aggregate are mixed according to the mass ratio of 1:2.1:6 to obtain the filling mortar for mine underground filling.

[0043] Make the above-mentioned mortar into a test block of 40mm×40mm×160mm, place the test block in a standard curing box for 48 hours, remove the mold, put it in constant temperature water at 20°C for curing, and test the 3d, 7d and 28d of the test block respectively. Uniaxial compressive strength.

Embodiment 2

[0045] The invention relates to a mortar for underground filling of a mine, which includes composite cementitious material, fine aggregate and water.

[0046] By weight, 17 parts of iron tailings powder, 62 parts of fine slag powder, 11 parts of quicklime and 10 parts of desulfurized ash are mixed as a composite cementitious material.

[0047] Take 480 parts of ultra-fine iron tailings sand and 320 parts of steel slag sand and mix them as fine aggregate.

[0048]The composite cementitious material, water and fine aggregate are mixed according to the mass ratio of 1:2.3:8 to obtain the filling mortar for mine underground filling.

[0049] Make the above-mentioned mortar into a test block of 40mm×40mm×160mm, place the test block in a standard curing box for 48 hours, remove the mold, put it in constant temperature water at 20°C for curing, and test the 3d, 7d and 28d of the test block respectively. Uniaxial compressive strength.

Embodiment 3

[0051] The invention relates to a mortar for underground filling of a mine, which includes composite cementitious material, fine aggregate and water.

[0052] By weight, 17 parts of iron tailings powder, 62 parts of fine slag powder, 11 parts of quicklime and 10 parts of desulfurized ash are mixed as a composite cementitious material.

[0053] Take 600 parts of ultra-fine iron tailings sand and 400 parts of steel slag sand and mix them as fine aggregate.

[0054] The composite cementitious material, water and fine aggregate are mixed according to the mass ratio of 1:2.4:10 to obtain the filling mortar for mine underground filling.

[0055] Make the above-mentioned mortar into a test block of 40mm×40mm×160mm, place the test block in a standard curing box for 48 hours, remove the mold, put it in constant temperature water at 20°C for curing, and test the 3d, 7d and 28d of the test block respectively. Uniaxial compressive strength.

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Abstract

The invention provides underground filling mortar used for mine and prepared from steel slag sand and beneficiation waste. The underground filling mortar comprises a composite gel material and fine aggregate in a mass ratio of 1: (6-12), wherein the composite gel material is prepared from iron tailing powder, superfine slag powder, quick lime, desulfurized fly ash and an additive; a mass ratio ofthe superfine iron tailing powder to the superfine slag powder to the quick lime to the desulfurized fly ash is (5-25): (40-75): (5-20): (5-15): (0-5); the fine aggregate is composed of superfine irontailing sand and steel slag sand; and a mass ratio of the superfine iron tailing sand to the steel slag sand is (8-20): (5-12). The raw materials are reasonably matched, so the prepared filling mortar is high in uniaxial compressive strength, good in fluidity, convenient to construct and low in engineering cost.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an underground mine filling mortar prepared by using steel slag sand and mineral processing waste. Background technique [0002] Steel slag, as a by-product of steelmaking, continues to accumulate, occupying land and polluting the environment. The mineral composition of steel slag is composed of tricalcium silicate, dicalcium silicate and RO phase, which belongs to the silicate system, so steel slag has relatively high activity of some clinker, and contains free calcium oxide and magnesium oxide. When the particle size of steel slag is small, there is a problem of volume instability after hydration, so the comprehensive utilization rate of domestic steel slag is low. Therefore, how to utilize steel slag in large quantities is an urgent problem for us to solve. [0003] Studies have shown that the smaller the particle size of steel slag, the greater its volume instabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B18/14C04B18/12
CPCC04B28/08C04B2111/00724C04B22/064C04B22/145C04B18/12C04B18/142Y02W30/91
Inventor 于峰陈太遥方圆武萍秦尹卜双双
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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