Cementing materials with micro-expansion effect for mine filling

A technology of mine filling and cementitious materials, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as low utilization rate, pollute the environment, occupy fertile land, etc., and achieve good fluidity and high strength. and stability effects

Inactive Publication Date: 2013-02-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extremely low utilization rate causes a large amount of steel slag to accumulate, occupy good land, pollute the environment, and reduce the economic benefits of iron and steel enterprises

Method used

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  • Cementing materials with micro-expansion effect for mine filling
  • Cementing materials with micro-expansion effect for mine filling
  • Cementing materials with micro-expansion effect for mine filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A kind of mine filling material with micro-expansion effect, its raw material composition and weight percentage are:

[0014] Steel slag: 70% Specific surface area: 590m 2 / kg

[0015] Slag: 20% Specific surface area: 520m 2 / kg

[0016] Desulfurization gypsum: 10%

[0017] Additional naphthalene-based water reducer: 0.5%

[0018] The following table shows the fluidity, compressive strength and micro-expansion results of the filling material prepared when the ratio of cementitious material to tailings is 1:4, mixed with water to a concentration of 75%. The micro-expansion of the filling material is tested with a concrete shrinkage dilatometer, and the fluidity is measured by the slump cylinder method in accordance with GB80-85 "Test Methods for Concrete Mixtures".

[0019]

[0020]

Embodiment 2

[0022] A kind of mine filling material with micro-expansion effect, its raw material composition and weight percentage are:

[0023] Steel slag: 63% Specific surface area: 590m 2 / kg

[0024] Slag: 25% Specific surface area: 520m 2 / kg

[0025] Desulfurization gypsum: 12%

[0026] Additional naphthalene-based water reducer: 0.5%

[0027] The following table shows the fluidity, compressive strength and micro-expansion results of the filling material prepared when the ratio of cementitious material to tailings is 1:4, mixed with water to a concentration of 75%.

[0028]

[0029]

Embodiment 3

[0031] A kind of mine filling material with micro-expansion effect, its raw material composition and weight percentage are:

[0032] Steel slag: 48% Specific surface area: 590m 2 / kg

[0033] Slag: 40% Specific surface area: 480m 2 / kg

[0034] Desulfurization gypsum: 12%

[0035] Additional naphthalene-based water reducer: 0.5%

[0036] The following table shows the fluidity, compressive strength and micro-expansion results of the filling material prepared when the ratio of cementitious material to tailings is 1:4, mixed with water to a concentration of 75%.

[0037]

[0038]

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Abstract

The invention relates to a method of using industrial waste residues, such as steel slag, blast furnace slag, and the like as main raw materials to produce a mine cementation filling material with a micro-expansion effect, which belongs to the field of environmental protection and mine filling. Aiming at the difficult problems that the cement amount required for cemented filling is large, filling cost is high, filling materials are easy in bleeding and difficult in roof-contacted filling at present, the invention provides a cementing material, which uses 30%-80% of the steel slag mixed with 15%-60% of slag and 5%-15% of desulfurized gypsum to be as an activator to form a hydraulic cementing material in a mixing way, and the hydraulic cementing material completely replaces cement as a cementing agent. The steel slag-slag full-tailing mine filling material which is prepared by the cementing material has micro-expansibility and good fluidity, compressive strength after 28 days can reach high up to 14.3Mpa, and the performance requirement of mine filling and roof-contacted filling on the compressive strength can be satisfied.

Description

[0001] technical field [0002] The invention belongs to the fields of environmental protection and mine filling, and provides a method for using steel slag, water-quenched blast furnace slag and other industrial waste slag as main raw materials to completely replace cement to produce mine cementation filling cementitious materials with micro-expansion effect. Background technique [0003] With the further improvement of high-concentration cemented filling technology and the development of paste filling technology and high-water filling technology, all kinds of paste filling materials or high-concentration filling materials based on full tailings or full tailings are used in mine filling. be widely used. At present, cement is still the main cement for cement filling. Its consumption is large and its cost is high, which is a major problem that plagues mines. Some cement can be replaced by water-quenched blast furnace slag, fly ash, red mud, etc., but due to The filling body ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/30
CPCY02W30/91
Inventor 倪文张静文胡文
Owner UNIV OF SCI & TECH BEIJING
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