Binding material for filling fine-grain tailings

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...

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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 mud (-10μm content ≥ 30% in materials) tailings are difficult to cement and the cementation strength is not high, so all kinds of tailings can be used as filling aggregates for mine room filling and open-pit mining Backfill reclamation

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