Binding material for filling fine-grain tailings

A technology for cementitious materials and fine-grained tailings, which is applied in the field of mine filling materials, can solve the problems of low cementing strength and difficulty in cementing tailings, and achieves the effects of reducing costs, reducing construction investment and maintenance costs, and simplifying the production process.

Active Publication Date: 2013-05-15
SINOSTEEL MAANSHAN INST OF MINING RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The task of the present invention is to provide a cementitious material for filling fine-grained tailings with low cost and simple construction in view of the above-mentioned problems in the prior art. Tailings and high m...

Method used

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  • Binding material for filling fine-grain tailings
  • Binding material for filling fine-grain tailings
  • Binding material for filling fine-grain tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Belite-sulfoaluminate cement is compounded according to the ratio of sulfoaluminate cement and ordinary Portland cement at a ratio of 1:3, and the components in Example 1 are mixed and milled to obtain a cementitious material. The cementitious material was tested separately with all fine ore tailings and -200 mesh copper ore classified tailings. The compressive strength is shown in Table 2 and Table 3.

[0033] Table 2 Full tailings of fine ore (40% mud), compressive strength of gel (MPa)

[0034]

[0035] The mortar ratio refers to the mass ratio of the cementitious material of the present invention to the tailings slurry, and the same applies below.

[0036] Table 3 -200 mesh copper ore classification tailings, gel compressive strength (MPa)

[0037]

Embodiment 2

[0039] Belite-sulfoaluminate cement is compounded according to the ratio of sulfoaluminate cement and ordinary Portland cement at a ratio of 1:3, and the components in Example 1 are mixed and milled to obtain a cementitious material. The cementitious material was tested with the fine ore tailings and the -200 mesh copper ore classified tailings respectively. The compressive strengths are shown in Table 4 and Table 5.

[0040] Table 4 Full tailings of fine ore (40% mud content), compressive strength of gel

[0041]

[0042] Table 5 -200 mesh copper ore classified tailings, gel compressive strength

[0043]

Embodiment 3

[0045] 25.26% Belite-sulfoaluminate cement (sulfoaluminate cement and ordinary Portland cement are mixed in a ratio of 1:3), 4% anhydrous gypsum, 2% quicklime, 60% slag powder, 5 % Fly ash, 4% sodium silicate, 0.4% sodium fluorosilicate, 0.14% lithium hydroxide, 0.2% polycarboxylic acid type water reducing agent are mixed and milled to obtain a gelling material. The cementitious material was tested separately with all fine ore tailings and -200 mesh copper ore classified tailings. The compressive strengths are shown in Table 6 and Table 7.

[0046]

[0047] Table 6 Full tailings of fine ore (40% mud content), compressive strength of gel (MPa)

[0048]

[0049] Table 7 -200 mesh copper ore classification tailings, gel compressive strength (MPa)

[0050]

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Abstract

The invention discloses a binding material for filling fine-grain tailings. The binding material is prepared by milling and mixing the following components in percentage by mass: 15-40% of belite-sulphate aluminum cement, 2-10% of gypsum, 2-8% of quick lime, 40-70% of superfine-grain slag powder, 2-10% of coal ash, 1-6% of activating agent, 0.1-0.5% of activating accelerant, 0.1-0.5% of coagulant, and 0.1-0.5% of water reducer, wherein the activating agent is Na2SiO3, the activating accelerant is sodium fluosilicate, and the coagulant is any one or a mixture of two or more of LiOH, LiCO3 and LiCl; and the water reducer is a naphthalene water reducer or a polycarboxylic acid water reducer. According to the binding material for filling the fine-grain tailings, the problems that -0.074-mm fine-grain tailings and high-silt-content tailings are difficultly solidified and are low in strength after being solidified, and the strength of a filling body can meet a strength requirement on cut and fill of a mine on the filling body by using the binding material; the liquidity of slurry can be improved, and roof-contacting performance of the filling body can be improved; and the water retention capacity can be improved, and the water seepage of the slurry is reduced.

Description

Technical field [0001] The invention relates to the technical field of mine filling materials, and in particular to a cementitious material using all tailings and fine-grained tailings with a content of -0.074 mm ≥ 95% as aggregates. Background technique [0002] With the improvement of people's awareness of environmental protection, non-renewable resources and the continuous development of circular economy, filling method mining has become the development trend of the mining industry in the future. Filling the goaf is an important way to absorb a large amount of tailings, reduce tailings emissions, and store land. This technology mixes concentrated tailings and cementitious materials into a certain concentration of filling mortar to fill the goaf with a certain degree of formation. Strong filling body. [0003] In order to fully recover the underground resources, most underground mines adopt multi-step mining in the stoping sequence. Therefore, reducing the filling cost of the mi...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 杨晓军徐修平海冰曾申进于先坤徐静
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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