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CN-122010436-A - High-doping-amount fine-fraction iron tailing-based cementing material, and preparation method and application thereof

CN122010436ACN 122010436 ACN122010436 ACN 122010436ACN-122010436-A

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a high-doping-amount fine-particle-level iron tailing-based cementing material, a preparation method and application thereof. The high-doping-amount fine-particle-level iron tailing-based cementing material comprises iron tailing active powder, an alkali excitant, high-calcium silicon aluminum solid waste, a sulfate excitant and an ion complexation regulating agent, wherein in a cementing material system, the molar ratio of calcium oxide to silicon dioxide is 1.0-3.0, the molar ratio of aluminum oxide to calcium oxide is 0.01-0.3, the molar ratio of sulfur trioxide to calcium oxide is 0.1-3.0, and the molar ratio of ferric oxide to calcium oxide is 0.06-0.15. According to the invention, through multicomponent cooperative regulation and ion complexation optimization, the fine fraction iron tailing doping amount is more than 40%, meanwhile, the cementing material is ensured to have excellent early-stage and later-stage strength, the utilization rate of iron-containing phase silicon-aluminum solid waste is improved, and the environmental pressure is reduced.

Inventors

  • LIU JUANHONG
  • LIU YUNFEI
  • ZHOU QIAN
  • YU YONG
  • LV HAO
  • ZHANG ZHIWEI
  • HOU YUNXIANG
  • WANG HAIYUE
  • HE YING
  • Qi Jiaqi

Assignees

  • 北京科技大学
  • 北京城建八建设发展有限责任公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The high-doping-amount fine-particle-level iron tailing-based cementing material is characterized by comprising the following components of iron tailing active powder, an alkali excitant, high-calcium silicon aluminum solid waste, a sulfate excitant and an ion complexation regulating agent, wherein in a cementing material system, the molar ratio of calcium oxide to silicon dioxide is 1.0-3.0, the molar ratio of aluminum oxide to calcium oxide is 0.01-0.3, the molar ratio of sulfur trioxide to calcium oxide is 0.1-3.0, and the molar ratio of ferric oxide to calcium oxide is 0.06-0.15.
  2. 2. The high-doping fine-fraction iron tailing-based cementing material according to claim 1, wherein the 28-day activity index of the iron tailing active powder is 60% -90%, the chemical composition comprises 18% -22% by weight of ferric oxide, 2% -5% by weight of calcium oxide, 65% -80% by weight of silicon dioxide, 3% -10% by weight of aluminum oxide, 3% -8% by weight of magnesium oxide and 0% -1% by weight of sulfur trioxide, and the specific surface area of the iron tailing active powder is 300% -480 m 2 /kg.
  3. 3. The high-doping amount fine-fraction iron tailing-based cementing material of claim 1, wherein the alkali-activator is selected from one or more of cement clinker, carbide slag, steel slag and red mud; The 28-day activity index of the high-calcium silicon aluminum solid waste is 90% -120%, wherein the content of calcium oxide is more than or equal to 40wt%, the content of aluminum oxide is more than or equal to 15wt%, the content of silicon dioxide is more than or equal to 20wt%, and the specific surface area of the high-calcium silicon aluminum solid waste is more than or equal to 400m 2 /kg.
  4. 4. The high-doping-amount fine-fraction iron tailing-based cementing material according to claim 1, wherein the sulfate activator is selected from one or more of titanium gypsum, anhydrite, phosphogypsum and desulfurized gypsum, and the specific surface area of the sulfate activator is 300-500 m 2 /kg.
  5. 5. The high-doping-amount fine-fraction iron tailing-based cementing material according to claim 1, wherein the ion complexing regulating agent is one or a combination of more than one of sodium citrate, sodium gluconate and EDTA, and the addition amount of the ion complexing regulating agent is 0.01-5wt% of the total mass of the cementing material.
  6. 6. A method of preparing the high loading fine grade iron tailings based cementitious material of any one of claims 1-5, comprising the steps of: s1, raw material pretreatment, namely drying fine-fraction iron tailings and high-calcium silicon aluminum solid waste, and drying sulfate excitant at low temperature; S2, mechanically activating, namely mechanically grinding and activating the pretreated fine-grained iron tailings to obtain iron tailing active powder; S3, uniformly mixing the iron tailing active powder, the alkali activator, the pretreated high-calcium silicon aluminum solid waste, the sulfate activator and the ion complexation regulating agent according to a set oxide molar ratio to prepare the high-doping-amount fine-particle-level iron tailing-based cementing material.
  7. 7. The preparation method of claim 6, wherein in the step S1, the drying temperature of the fine-grained iron tailings and the high-calcium silicon aluminum solid waste is 100-110 ℃, the drying time is 20-28 h, the drying temperature of the sulfate activator is 55-65 ℃, and the drying time is 20-28 h.
  8. 8. The preparation method of the ceramic powder according to claim 6, wherein in the step S2, the mechanical grinding activation adopts an experimental mill, the capacity of the experimental mill is 5kg, the ball mass ratio is (3-5): 1, the rotating speed of the mechanical grinding activation is 40-55 r/min, and the grinding time is 10-90 min.
  9. 9. The method according to claim 6, wherein in step S3, a mortar stirrer is used for mixing, and the mortar stirrer is used for stirring at a low speed of 62.+ -. 5r/min for 30S and then at a high speed of 125.+ -. 10r/min for 30S.
  10. 10. The use of the high-doping fine-fraction iron tailing-based cementing material according to any one of claims 1 to 5 in the preparation of building mortar, wherein the mass ratio of water to the cementing material is (0.4 to 0.6): 1, the mass ratio of sand to the cementing material is (2 to 4): 1, the sand is Chinese ISO standard sand or other sand conforming to the ISO standard, and the preparation process conforms to the GB/T17671-2021 standard requirement.

Description

High-doping-amount fine-fraction iron tailing-based cementing material, and preparation method and application thereof Technical Field The invention belongs to the technical field of building materials, and particularly relates to a high-doping-amount fine-particle-level iron tailing-based cementing material, a preparation method and application thereof. Background The iron tailings produced each year are huge in quantity in China, which is a large country for iron and steel production and iron ore consumption. The total amount of metal tailings stockpiled nationally has been counted to be more than 235 hundred million tons, the iron tailings account for more than 70%, and the annual production is about 14 hundred million tons. The iron tailings are usually disposed in an open-air stockpiling or tailing pond landfill mode, so that a large amount of land resources are occupied, and the contained heavy metal ions and residual beneficiation reagent can cause long-term pollution to surrounding water, soil and atmosphere through wind erosion, leaching and other ways, so that serious environmental safety hazards and high environmental treatment cost exist. In addition, with the increasing scarcity of high grade mineral resources, the milling process is continually improved to increase the beneficiation recovery rate, resulting in an annual increase in the fraction of fine fraction tailings (D50 <75 μm) in the tailings. Although the fine-grained iron tailings are rich in SiO 2, the fine-grained iron tailings generally exist in a crystal (such as quartz, feldspar and the like) form, and the activation difficulty is high. At present, the utilization of fine-fraction iron tailings in building materials is mostly limited to low-doping auxiliary admixtures, and researches are mostly focused on the contents of SiO 2 and Al 2O3, so that the effect of Fe 2O3 in a gelling system is ignored. The alkali salt composite excitation low-carbon hydraulic cementing material disclosed by the related art only considers the influence of Si and Al in the solid waste of silicon aluminum, does not pay attention to the effect of iron content on a hydration system, and limits the high-value utilization of the iron tailings. Therefore, developing a cementing material which can realize high-doping utilization of fine-fraction iron tailings and has both performance and environmental protection becomes a technical problem to be solved in the field. In view of this, the present invention has been made. Disclosure of Invention Aiming at the problems of high activation difficulty, low doping amount and neglect of iron content influence of fine-fraction iron tailings in the prior art, the invention provides a high doping amount fine-fraction iron tailings base cementing material, and a preparation method and application thereof. Through multicomponent cooperative regulation and control and ion complexation optimization, the fine fraction iron tailings mixing amount is more than 40% (controlled by Fe 2O3/CaO), meanwhile, the cementing material is ensured to have excellent early-stage and later-stage strength, the utilization rate of iron-containing phase silicon-aluminum solid waste is improved, and the environmental pressure is reduced. In order to achieve the above purpose, the invention adopts the following technical scheme: The high-doping-amount fine-particle-level iron tailing-based cementing material comprises iron tailing active powder, an alkali excitant, high-calcium silicon aluminum solid waste, a sulfate excitant and an ion complexation regulating agent, wherein in a cementing material system, the molar ratio of calcium oxide to silicon dioxide is 1.0-3.0, the molar ratio of aluminum oxide to calcium oxide is 0.01-0.3, the molar ratio of sulfur trioxide to calcium oxide is 0.1-3.0, and the molar ratio of ferric oxide to calcium oxide is 0.06-0.15. Further, the 28-day activity index of the iron tailing active powder is 60% -90%, the chemical composition comprises 18% -22% of ferric oxide, 2% -5% of calcium oxide, 65% -80% of silicon dioxide, 3% -10% of aluminum oxide, 3% -8% of magnesium oxide and 0% -1% of sulfur trioxide, and the specific surface area of the iron tailing active powder is 300% -480 m 2/kg. Further, the alkali-activator is selected from one or more of cement clinker, carbide slag, steel slag and red mud; The 28-day activity index of the high-calcium silicon aluminum solid waste is 90% -120%, wherein the content of calcium oxide is more than or equal to 40wt%, the content of aluminum oxide is more than or equal to 15wt%, the content of silicon dioxide is more than or equal to 20wt%, and the specific surface area of the high-calcium silicon aluminum solid waste is more than or equal to 400m 2/kg. Further, the sulfate excitant is selected from one or more of titanium gypsum, anhydrite, phosphogypsum and desulfurized gypsum, and the specific surface area of the sulfate excitant is 300-500 m 2/kg. Further, the ion complexing