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CN-122010437-A - Mine filling cementing material, preparation method thereof and mine filling material

CN122010437ACN 122010437 ACN122010437 ACN 122010437ACN-122010437-A

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a mine filling cementing material, a preparation method thereof and a mine filling material. The mine filling cementing material comprises, by weight, 20-60 parts of high-sulfur iron tailing powder, 5-20 parts of alkali-exciting agent, 30-60 parts of S95 mineral powder, 0.01-1.0 part of composite complexing agent and 1-5 parts of crystal form regulator. The cementing material provided by the invention can be used for replacing cement and cementing powder in the filling material, so that the cement consumption is reduced, the cost is reduced, and the prepared filling body meets the requirements on strength, fluidity and durability.

Inventors

  • GAO YIJUN
  • JIA WEI
  • CHEN YANG
  • DING KAIZHEN
  • LIU JUANHONG
  • YU YONG
  • ZHOU LEI
  • LIU WENSHENG
  • WANG HUI
  • LIU YANJUN
  • XU JIBIN
  • YANG FEI

Assignees

  • 安徽马钢罗河矿业有限责任公司
  • 北京科技大学
  • 安徽马钢矿业资源集团有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The mine filling cementing material is characterized by comprising, by weight, 20-60 parts of high-sulfur iron tailing powder, 5-20 parts of alkali-exciting agent, 30-60 parts of S95 mineral powder, 0.01-1.0 part of composite complexing agent and 1-5 parts of crystal form regulator.
  2. 2. The mine filling cementing material according to claim 1, wherein the high-sulfur iron tailing powder comprises 18% -25% of SO 3 , 15% -23% of Fe 2 O 3 , 20% -30% of SiO 2 , 3% -10% of Al 2 O 3 and 300-500 m 2 /kg of specific surface area.
  3. 3. The mine filling cementitious material of claim 1, wherein the alkali-activator is selected from one or more of clinker, carbide slag, and red mud; And/or the crystal form regulator is selected from one or more of nano silicon, calcium formate and acrylic acid.
  4. 4. The mine filling cementing material according to claim 1, wherein the content of Al 2 O 3 in the S95 mineral powder is more than or equal to 13%, the specific surface area is more than or equal to 400m 2 /kg, and the 28d activity index is 95% -105%.
  5. 5. The mine filling cementing material according to claim 1, wherein the composite complexing agent is a mixture of triethanolamine and triisopropanolamine, the mass ratio of the triethanolamine to the triisopropanolamine is (1-20): (3-18), and the mass ratio of the composite complexing agent to the total SO 3 in the cementing system is (0.005-1): 1.
  6. 6. The mine filling cementitious material of claim 1, further comprising a polycarboxylic acid high performance water reducer, wherein the mass fraction of the polycarboxylic acid high performance water reducer is 0.2 parts.
  7. 7. A method of preparing a mine filling cementitious material as claimed in any one of claims 1 to 6, comprising the steps of: s1, drying high-sulfur iron tailings until the water content is less than or equal to 1.0%, and grinding to obtain high-sulfur iron tailings powder; S2, weighing high-sulfur iron tailing powder, alkali excitant, S95 mineral powder, composite complexing agent and crystal form regulator according to the proportion, and uniformly mixing to obtain the mine filling cementing material.
  8. 8. The preparation method according to claim 7, wherein in the step S1, the drying temperature is 60 ℃, the grinding treatment adopts an experimental mill for mechanical grinding, the experimental mill capacity is 5kg, the ball-to-material ratio is (3-5): 1, and the rotating speed is 40-55 r/min.
  9. 9. The method according to claim 7, wherein in step S2, the mixing is performed by using a mixer under the condition that the mixing is performed by using a homogenizing mixer at 40-60 r/min for 10-20 min.
  10. 10. A mine filling material is characterized by comprising the mine filling cementing material, water and wet-base iron tailings according to any one of claims 1-6, wherein the mass ratio of the three is 1 (3-8) (3-10), and the water content of the wet-base iron tailings is 20%.

Description

Mine filling cementing material, preparation method thereof and mine filling material Technical Field The invention belongs to the technical field of building materials, and particularly relates to a mine filling cementing material, a preparation method thereof and a mine filling material. Background The iron tailings are bulk solid wastes generated in the iron ore dressing process, wherein a large amount of sulfate minerals are associated with part of iron ore deposits, SO that sulfur elements in the tailings take gypsum (anhydrite, semi-hydrated gypsum and dihydrate gypsum) as main occurrence forms, the SO 3 content can reach 18% -25%, and the content of sulfides such as pyrite (FeS 2) is relatively low. The large-scale and safe utilization of the high-sulfur iron tailings is one of the key challenges in the field of mine solid waste recycling. When the high-sulfur iron tailings are used in high doping amount, gypsum contained in the high-sulfur iron tailings can be rapidly dissolved in the early stage of hydration of a gelling system, and high-concentration SO 4²- is released. These sulfate ions react rapidly with active components such as tricalcium aluminate (C 3 a) in the cement to form a large amount of ettringite (AFt). The rapid and centralized ettringite generation directly initiated by the internal sulfate forms a double challenge for the material performance, namely firstly, the mass generation of early ettringite not only consumes a key aluminum source in a system but also can prevent further dissolution of a silicon source and an aluminum source, and interferes with the normal formation and development of C-S-H gel, so that the early strength of the material is slow to develop, secondly, the time sequence and the space distribution of ettringite generation are out of control, the crystallization pressure is easy to cause internal damage when the microstructure of the slurry is insufficiently strengthened, and adverse expansion is continuously initiated in the later stage, and finally, the material is in 28-day activity index growth stagnation and even decline, and the long-term compressive strength collapse is finally shown. In the field of cemented filling, this is directly related to the early support capacity and long-term stability and safety of goaf fillers. Therefore, it is desirable to provide a cementitious material that can regulate gypsum dissolution and ettringite formation kinetics, and achieve a combination of strength development and volume stabilization. Disclosure of Invention Aiming at the technical problems that the high-sulfur iron tailings in the prior art are easy to cause slow strength development and poor volume stability of a cementing material and the traditional filling cementing material is high in cost, the invention provides a mine filling cementing material, a preparation method thereof and a mine filling material, wherein the cementing material can be used for replacing cement and cement powder in the filling material, the cement consumption is reduced, the cost is reduced, and the prepared filling body meets the requirements in the aspects of strength, fluidity and durability. In order to achieve the above purpose, the invention adopts the following technical scheme: the mine filling cementing material comprises, by weight, 20-60 parts of high-sulfur iron tailing powder, 5-20 parts of alkali-exciting agent, 30-60 parts of S95 mineral powder, 0.01-1.0 part of composite complexing agent and 1-5 parts of crystal form regulator. Further, the high-sulfur iron tailing powder contains 18-25% of SO 3, 15-23% of Fe 2O3, 20-30% of SiO 2, 3-10% of Al 2O3 and 300-500 m 2/kg of specific surface area. Further, the alkali-activated agent is selected from one or more of clinker, carbide slag and red mud; And/or the crystal form regulator is selected from one or more of nano silicon, calcium formate and acrylic acid. Further, in the S95 mineral powder, the content of Al 2O3 is more than or equal to 13%, the specific surface area is more than or equal to 400m 2/kg, and the 28d activity index is 95% -105%. Further, the compound complexing agent is a mixture of triethanolamine and triisopropanolamine, the mass ratio of the triethanolamine to the triisopropanolamine is (1-20): (3-18), and the mass ratio of the compound complexing agent to the total SO 3 in the gelling system is (0.005-1): 1. Further, the water reducer further comprises a polycarboxylic acid high-performance water reducer, wherein the mass part of the polycarboxylic acid high-performance water reducer is 0.2 part. In addition, the invention also provides a preparation method of the mine filling cementing material, which comprises the following steps: s1, drying high-sulfur iron tailings until the water content is less than or equal to 1.0%, and grinding to obtain high-sulfur iron tailings powder; S2, weighing high-sulfur iron tailing powder, alkali excitant, S95 mineral powder, composite complexing agent and crystal