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Coal mine backfill material and preparation method of same
The invention discloses a coal mine backfill material which is prepared from following raw materials, by mass, 30-60% of magma earth, 20-50% of tuff, 20-40% of expanded perlite dust collecting powder and 1-10% of an auxiliary material, wherein the total mass of the raw materials is 100%. The auxiliary material is a composition of one or more from aluminium dihydrogen phosphate, aluminium hydroxide, coal powder and sodium hexametaphosphate. In the coal mine backfill material, the expanded perlite dust collecting powder having 10-15 expanding times is used for occupying a space structure. By means of the low-melting-point magma earth as a co-fluxing agent, the tuff is reduced in sintering temperature. Under the sintering conditions, a micro-porous aggregate having an excellent structure is formed, wherein the micro-pores formed during sintering can form an individual closed pore structure, thereby reducing water absorption rate. The material has a reasonable granular size grading with more than 85% in roundness and the granules have excellent flowability, so that the material can compactly fill underground gaps. The coal mine backfill material is 140-160 kg/m<3> in volume-weight and is 18-25 MPa in cylinder compressive strength, thereby achieving excellent pressure resistance.
Coal mine backfill material and preparation method of same
The invention discloses a coal mine backfill material which is prepared from following raw materials, by mass, 30-60% of magma earth, 20-50% of tuff, 20-40% of expanded perlite dust collecting powder and 1-10% of an auxiliary material, wherein the total mass of the raw materials is 100%. The auxiliary material is a composition of one or more from aluminium dihydrogen phosphate, aluminium hydroxide, coal powder and sodium hexametaphosphate. In the coal mine backfill material, the expanded perlite dust collecting powder having 10-15 expanding times is used for occupying a space structure. By means of the low-melting-point magma earth as a co-fluxing agent, the tuff is reduced in sintering temperature. Under the sintering conditions, a micro-porous aggregate having an excellent structure is formed, wherein the micro-pores formed during sintering can form an individual closed pore structure, thereby reducing water absorption rate. The material has a reasonable granular size grading with more than 85% in roundness and the granules have excellent flowability, so that the material can compactly fill underground gaps. The coal mine backfill material is 140-160 kg/m<3> in volume-weight and is 18-25 MPa in cylinder compressive strength, thereby achieving excellent pressure resistance.
Coal mine backfill material and preparation method of same
JING QIANGSHAN (author) / LUO XIANGYANG (author) / FANG LINXIA (author)
2016-01-13
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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