A composite ultra-high water filling material and its preparation method

Abstract

The invention belongs to the technical field of materials, and discloses a composite type ultrahigh water filling material and a preparation method thereof. The composite type ultrahigh water filling material is prepared from slurry A and slurry B in equal volumes, wherein the slurry A is prepared from the following components in parts by weight: 1 part of A1, 0.05 to 0.20 part of A2 and 3 to 11 parts of water; the slurry B is prepared from the following components in parts by weight: 1 part of B1, 0.05 to 0.20 part of B2 and 3 to 11 parts of water; A1 is prepared from sulfate aluminate cement clinker, pulverized fuel ash and a composite additive I; A2 is prepared from polymer polyol and a catalyst; the composite additive I is prepared from sodium chloride, anhydrous sodium sulfate, sodium metaaluminate, sodium gluconate and hydroxypropyl methyl cellulose; B1 is prepared from gypsum, lime, the pulverized fuel ash and a composite additive II; B2 is prepared from polyisocyanate and a dispersing agent; the composite additive II is prepared from sodium carbonate, aluminum sulfate and the hydroxypropyl methyl cellulose. The composite type ultrahigh water filling material disclosed by the invention has the advantages of better hardening performance and better using performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a composite ultra-high water filling material and a preparation method thereof. Background technique [0002] On the one hand, after mining in coal mines and other mining industries, in order to avoid the formation of collapsed areas, it is necessary to fill the gobs, especially the "three ups and one down" areas; Due to geological structure and other reasons, there will be unfavorable conditions such as caving areas or collapsed columns. In order to avoid their impact on the coal mining process, pre-filling is often required. At present, the filling technologies used mainly include paste filling technology, paste-like filling technology, high-water filling technology, gangue filling technology, etc. The above filling technologies have the advantages of large material consumption, complicated construction process, long setting and hardening time, incomplete filling,...

AI Technical Summary

Problems solved by technology

At present, the filling technologies used mainly include paste filling technology, paste-like filling technology, high-water filling technology, gangue filling technology, etc. The above filling technologies have the advantages of large material consumption, complicated construction process, long setting and hardening time, incomplete filling, It needs to consume a lot of manpower and other disadvantages. Although the ultra-high water filling technology can avoid the above disadvantages, due to the limited ability of the current ultra-high water material to consolidate water, most of it is still free water dispersed in the filling body. During the process, if you encounter this filling area, it is as if the coal cutter has encountered a mud area. Along the direction of rotation of the coal cutter, the filling material will fly around and fly to the scraper machine. Due to the high water content of the filling material, it will Slippage occurs on the scraper machine, which affects the conveying effect