Aeolian sand filling material for mine filling and preparation method thereof

Abstract

The invention provides an aeolian sand filling material for mine filling and a preparation method of the aeolian sand filling material. The aeolian sand filling material comprises the following components: 25-60 parts of aeolian sand, 3-20 parts of gangue, 3-25 parts of cement, 10-25 parts of fly ash and 20-30 parts of water. Wherein the gangue is crushed gangue particles, and the particle size of the gangue particles is not larger than 10 mm. And the mass fraction of the slurry of the aeolian sand filling material is 70-80%. The aeolian sand filling material provided by the invention is prepared from the aeolian sand, the gangue, the fly ash, the cement and the water as raw materials, and the performance of the aeolian sand filling material can achieve the effect of a pure cement cementing material; and compared with the existing single aggregate aeolian sand filling, the mine filling material has the advantages of stable slurry structure, small bleeding of the filling material, no need of dehydration underground, good suspension property and high filling material strength. And in the long-distance pipeline conveying process, the slurry flow state stability is high, and pipeline conveying is smooth.

Description

technical field [0001] The invention relates to the technical field of high-concentration filling of aeolian sand and gangue for mine filling, in particular to an aeolian sand filling material used for mine filling and a preparation method thereof. Background technique [0002] The Yushen mining area in Shaanxi is located on the edge of the Mu Us Desert. The aeolian sand in the desert has caused a large amount of desertification of the surrounding land. It is imperative to popularize the filling and filling mining method in the Yushen mining area, especially in the water resources protection area. Due to the small coal gangue output in the northern Shaanxi mining area, the aeolian sand distributed around the mining area can be fully utilized for filling. At present, a single aeolian sand aggregate is mainly used for filling, but the filling slurry with a single aeolian sand is commonly used. The structure is unstable, the filling material has large bleeding, poor suspension,...

AI Technical Summary

Problems solved by technology

Due to the small coal gangue output in the northern Shaanxi mining area, the aeolian sand distributed around the mining area can be fully utilized for filling. At present, a single aeolian sand aggregate is mainly used for filling, but the filling slurry with a single aeolian sand is commonly used. The structure is unstable, the filling material has large bleeding, poor suspension, and a large amount of dehydration is required in the downhole, resulting in poor filling environment and low strength of the filling material

When the material gradation is single and the slurry is unstable, aeolian sand and gangue are easy to accumulate in the pipeline, and fine aggregates such as fly ash and cement are squeezed out under the action of the pump pressure, destroying the formation of the lubricating layer and loss of pipeline resistance Increase, resulting in further consolidation of slurry, eventually leading to plugging