A kind of wet ash discharge base filling material and its preparation method and application

Abstract

The invention relates to the technical field of mine filling materials, in particular to a wet ash discharge-based filling material and a preparation method and application thereof. The filling material includes the following components: 50-150 parts of gel material, 10-20 parts of activator, 2-5 parts of water retention and dispersant, 0.5-1.5 parts of water reducing agent, 0.5-1.5 parts of air-entraining agent, and swelling agent 0.5-1.5 parts; wherein, the gel material is composed of the following components by weight: 60-80 parts of wet fly ash, 10-20 parts of dry fly ash, and 10-20 parts of cement. In the present invention, wet discharge fly ash is used as the main gel material, and dry discharge fly ash and cement are used as auxiliary gel materials. A mine filling material with high stone body strength, good fluidity, good water retention, good suspension and dispersion, micro-expansion, easy transportation, low cost, environmental protection and energy saving is prepared.

Description

technical field [0001] The invention relates to the technical field of mine filling materials, in particular to a wet ash-discharging-based filling material and its preparation method and application. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Underground mining activities often form huge goafs, which are the main hazards that induce disasters such as surface subsidence, mountain collapse, and underground water seepage. With the continuous development of mineral resources, the problem of gobs has become increasingly prominent. If it cannot be dealt with in time, it will seriously threaten mine production and surrounding safety. Filling is the most comm...

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Problems solved by technology

For example, patent document CN102173730B discloses a high-water filling material and its preparation method. Its main ingredients are sulphoaluminate cement, aluminate cement, retarder, suspending agent, etc. The later stage strength of the filling material is high, but It has high requirements on cement strength level and cannot be widely used

Patent document CN103396066B discloses a rapid-hardening filling material, the main ingredients of which are rapid-hardening sulfoaluminate cement, ordinary Portland cement, heavy calcium carbonate, external stabilizer, and coagulation accelerator. delivery, fast setting and fast hardening, safety and environmental protection, etc.; however, the inventor believes that the cement consumption is relatively large and the cost is relatively high

In addition, the inventor also believes that the high-water filling material mainly has the following disadvantages in the process of use: special cement is used, and the cost is high; the setting time is short, which is not conducive to the pre-preparation of the material, and multiple mixing equipment is required for the preparation. work, the filling process is complicated; the performance stability of the filling material is poor, etc.

[0007] The inventor believes that: at present, the use of wet-discharged fly ash as a gel material mainly has the following disadvantages: First, because wet-discharged fly ash has been soaked in water for a long time, its activity is very low and it is difficult to be excited, so it is necessary to select a suitable Secondly, the particles of the wet-discharged fly ash are coarse and the particle size distribution is uneven, and the phenomenon of water separation, sedimentation and stratification is prone to occur during the transportation process, and the viscosity of the internal particles of the wet-discharged fly ash Larger, resulting in poor slurry fluidity, difficult to meet the requirements of long-distance transportation

However, the inventor believes that it does not solve the problems of easy water separation, coagulation, poor fluidity, and poor stability of the filling material due to the wet discharge of fly ash particles, poor uniformity, and high viscosity.

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