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, in particular to a cementitious material using whole tailings and fine-grained tailings with a content of -0.074mm ≥ 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, the filling method mining has become the development trend of the mining industry in the future. Goaf filling is an important way to consume a large amount of tailings, reduce tailings discharge, and store up land. This technology prepares concentrated tailings and cementitious materials into filling mortar with a certain concentration and fills it into the goaf, forming a certain Strong filling. [0003] In order to fully recover underground resources, most underground mines adopt multi-step mining in the mining sequence. Therefore, reducing the mine filling cost, improvi...

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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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