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CN-121974635-A - Mine filling material and preparation method thereof

CN121974635ACN 121974635 ACN121974635 ACN 121974635ACN-121974635-A

Abstract

The invention relates to the technical field of comprehensive utilization of building materials and solid waste resources, and particularly discloses a mine filling material and a preparation method thereof. The mine filling material comprises, by mass, 75% -80% of lithium tailings, 8% -10% of smelting slag, 5% -8% of cement, 5% -8% of yellow phosphorus slag, 1% -2% of waste silicon slag, 0.4% -1% of alkali-exciting agent and 0.02% -0.05% of vinyl terephthalic acid, wherein the alkali-exciting agent comprises caustic soda, gypsum and a water reducer. The mine filling material provided by the invention optimizes the components and the proportion of the mine filling material, improves the utilization rate of solid waste, solves the problem that the existing lithium tailings are difficult to fully utilize, obviously improves the low-temperature strength of the mine filling material, and reduces the negative influence of the environment.

Inventors

  • HUO YUJIA
  • LIU JINSHAN
  • DIAO SHULEI
  • GU KAIXUAN

Assignees

  • 石家庄市易达恒联路桥材料有限公司

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. The mine filling material is characterized by comprising, by mass, 75% -80% of lithium tailings, 8% -10% of smelting slag, 5% -8% of cement, 5% -8% of yellow phosphorus slag, 1% -2% of waste silicon slag, 0.4% -1% of alkali-activated agent and 0.02% -0.05% of vinyl terephthalic acid; wherein the alkali-activated agent comprises caustic soda, gypsum and a water reducing agent.
  2. 2. The mine filling material of claim 1, wherein the particle size of the lithium tailings is 70-120 mesh; The content of SiO 2 in the lithium tailing is more than or equal to 80 percent, and the total content of Al 2 O 3 、Li 2 O and CaO is more than 9 percent; the total content of SiO 2 、Al 2 O 3 、Li 2 O and CaO in the lithium tailings is more than or equal to 95 percent.
  3. 3. The mine filling material of claim 1, wherein the smelting slag has a particle size of 120-200 mesh; The content of CaO in the smelting slag is 30% -40%, and the content of SiO 2 is 60% -70%.
  4. 4. The mine filling material of claim 1, wherein the cement is P.F cement, and the mass percentage of fly ash in the cement is 30% -40%.
  5. 5. The mine filling material of claim 1, wherein the yellow phosphorus slag has a particle size of 80-120 mesh.
  6. 6. The mine filling material of claim 1 or 5, wherein the content of P 2 O 5 in the yellow phosphorus slag is 2% -3.5%.
  7. 7. The mine filling material of claim 1, wherein the waste silica slag has a particle size of 5-30 μm and an activity index of not less than 85% for 7 days.
  8. 8. The mine filling material of claim 1, wherein the alkali-activated agent comprises, by mass, 2-12% of caustic soda, 85-95% of gypsum and 2-8% of a water reducer.
  9. 9. A method for preparing the mine filling material according to any one of claims 1 to 8, comprising the steps of: weighing the components according to the mass ratio, uniformly mixing the weighed components, and then adding water to obtain the mine filling material.
  10. 10. The method of producing a mine filling material according to claim 9, wherein the water-to-material ratio is (0.14-0.17): 1.

Description

Mine filling material and preparation method thereof Technical Field The invention relates to the technical field of comprehensive utilization of building materials and solid waste resources, in particular to a mine filling material and a preparation method thereof. Background The industrial solid waste discharge amount continuously rises, various solid wastes such as lithium tailings, smelting slag and the like are stored in huge amounts, a large amount of land resources are occupied, heavy metals such as lead, cadmium, chromium and the like and harmful chemical components contained in the solid waste are easy to pollute underground water and soil in modes such as rain leaching, soil infiltration and the like, serious environmental potential hazards are caused, threat is formed to the surrounding ecological environment and human health, and harmless disposal and recycling of the solid wastes are important environmental problems to be solved urgently. At present, although attempts for preparing filling materials by adopting industrial solid wastes to replace cement or river sand exist in the prior art, the prior art is limited to simple doping substitution of single or small amounts of solid wastes, and large-scale collaborative absorption of multi-source solid wastes cannot be realized; the technology has the advantages that the solid waste consumption is limited, the solid waste stacking problem is difficult to fundamentally solve, the problem of poor performance of the filling body is solved, particularly, the toughness is insufficient, the crack resistance is poor, the bearing requirement of a complex mine goaf cannot be met, meanwhile, the multisource solid waste is complex in components, the synergistic effect among the components is weak, uneven structure and unstable strength of the filling body are easily caused, the heavy metal curing effect is poor, secondary environmental risks exist, and the technical bottlenecks severely limit the large-scale application of industrial solid waste in the mine filling field. Therefore, a novel filling material system which can realize large-scale synergistic absorption of multi-source industrial solid waste and simultaneously endow the filling body with excellent mechanical properties and good environmental stability is developed, so that the cost of the filling material can be effectively reduced, the energy consumption and the carbon emission are reduced, the recycling and harmless treatment of the industrial solid waste can be realized, and the mine safety production, the ecological environment protection and the recycling of resources are considered. Disclosure of Invention In view of the above, the invention provides a mine filling material and a preparation method thereof. The mine filling material provided by the invention takes the lithium tailings as a main material, and is matched with smelting slag, yellow phosphorus slag, cement, waste silicon slag and vinyl terephthalic acid in an auxiliary manner, so that the activity index of the lithium tailings is obviously improved, the early strength of the mine filling material under a low-temperature condition is enhanced, the pain point that the existing lithium tailings cannot be recycled is solved, the preparation cost of the mine filling material is low, and the mine filling material has excellent strength under the low-temperature condition. In order to achieve the aim of the invention, the invention adopts the following technical scheme: The invention provides a mine filling material, which comprises the following raw material components, by mass, 75% -80% of lithium tailings, 8% -10% of smelting slag, 5% -8% of cement, 5% -8% of yellow phosphorus slag, 1% -2% of waste silicon slag, 0.4% -1% of alkali-activated agent and 0.02% -0.05% of vinyl terephthalic acid; wherein the alkali-activated agent comprises caustic soda, gypsum and a water reducing agent. The lithium ore processing can produce a large amount of lithium tailings, the mineral phase of the lithium tailings is glassy silicate, the physical and chemical properties are stable, the activity index is low, the lithium tailings are difficult to generate hydration reaction with the cementing material, the cementing effect cannot be exerted, and the lithium tailings can only be used as inert aggregate. The mixing proportion of the lithium tailing in the existing filling material is only 50%, so that full utilization is difficult to realize, engineering cost is increased, and meanwhile, hydration reaction can be delayed in a mine low-temperature environment in a alpine region, so that the strength of a filling body is insufficient, and potential safety hazards exist. Therefore, the research aims to provide a novel mine filling material, improve the utilization rate of lithium tailings, improve the early strength of the filling material under the low-temperature condition, and solve the pain point. The special alkali excitant can be quickly dissolved