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CN-121974643-A - Metallurgical solid waste-based soil curing agent and application thereof

CN121974643ACN 121974643 ACN121974643 ACN 121974643ACN-121974643-A

Abstract

The application relates to a metallurgical solid waste-based soil curing agent and application thereof, and belongs to the technical field of curing treatment. The soil curing agent comprises, by mass, 38% -55% of steel slag micro powder, 30% -40% of mineral powder, 10% -17% of fly ash and 2% -5% of quicklime, wherein the steel slag micro powder comprises, by mass, 35% -50% of CaO and 10% -20% of SiO 2 , and the specific surface area of the steel slag micro powder is more than or equal to 400m 2 /kg. The soil solidifying agent effectively utilizes metallurgical industry solid waste, reduces production cost, solidifies various soil bodies into engineering materials with higher strength and good durability, is particularly suitable for roadbed filling and stabilization treatment of heavy metal polluted soil, and finally, the solidified soil body meets the requirements of engineering strength and environmental protection standard, thereby realizing the dual benefits of solid waste recycling and soil solidification.

Inventors

  • GUO YANYONG
  • ZENG XIONGFENG
  • FENG HUA
  • TENG ZHAOJIE
  • CHEN YANBO
  • CHENG ZHENGMING
  • WANG TONGBIN
  • QI ZIHAN
  • LI YANQI

Assignees

  • 首钢京唐钢铁联合有限责任公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. The metallurgical solid waste-based soil curing agent is characterized by comprising, by mass, 38% -55% of steel slag micro powder, 30% -40% of mineral powder, 10% -17% of fly ash and 2% -5% of quicklime; The steel slag micro powder comprises, by mass, 35% -50% of CaO and 10% -20% of SiO 2 %, wherein the specific surface area of the steel slag micro powder is more than or equal to 400m 2 /kg.
  2. 2. The soil stabilizer according to claim 1, further comprising 2% -5% of an exciting agent in mass fraction.
  3. 3. The excitant according to claim 2, wherein the excitant is water glass, the modulus of the water glass being 2.2-3.0.
  4. 4. The soil stabilizer according to claim 1, wherein the ore powder grade is greater than or equal to S95 and/or, The fly ash comprises class I fly ash and class II fly ash, and/or, The CaO in the quicklime is more than or equal to 90 percent by mass fraction.
  5. 5. The use of the soil conditioner according to any one of claims 1 to 4, wherein the use comprises: Obtaining a soil stabilizer having the composition of any one of claims 1 to 4; adding the soil curing agent into the soil body for mixing to obtain a mixed material; And compacting and curing the mixed materials in sequence to obtain a solidified soil body.
  6. 6. The use according to claim 5, wherein the mass of the soil solidifying agent is 4% -15% of the dry soil mass of the soil body.
  7. 7. The use according to claim 5, wherein if the soil body is roadbed filling soil, the mass of the soil solidifying agent is 6% -8% of the dry soil mass of the soil body, and/or, If the soil body is a deep mixing pile or a gravity type solidification wall, the mass of the soil solidifying agent is 10% -12% of the mass of dry soil of the soil body, and/or, If the soil body is heavy metal polluted soil, the mass of the soil curing agent is 12% -15% of the mass of dry soil of the soil body.
  8. 8. The method according to claim 5, wherein if the soil body is heavy metal contaminated soil, water glass is added into the soil body in the mixing process, and the mass of the water glass is 2.5% -5.0% of the mass of dry soil of the soil body.
  9. 9. The use according to claim 5, wherein the mixing equipment comprises at least one of a road mixer, a double-shaft mixer and a deep mixing pile machine.
  10. 10. The method according to claim 5, wherein the compaction is greater than or equal to 95%, the curing period of the curing is greater than or equal to 7d, and/or, The unconfined compressive strength of the solidified soil 7d is more than or equal to 2MPa, and the leaching concentration of heavy metal Pb in the solidified soil is less than or equal to 5mg/L.

Description

Metallurgical solid waste-based soil curing agent and application thereof Technical Field The application relates to the technical field of solidification treatment, in particular to a metallurgical solid waste-based soil solidifying agent and application thereof. Background The metallurgical solid waste mainly comprises industrial byproducts such as steel slag micropowder, mineral powder, fly ash and the like, and the long-term piling of the metallurgical solid waste not only occupies a large amount of land resources, but also can migrate along with rainwater to potentially pollute surrounding soil and water. In geotechnical engineering, a soil solidifying agent is used as a material capable of improving soil engineering characteristics, and is commonly used for improving bearing capacity, water stability and durability of soft soil or polluted soil. The traditional soil curing agent mainly comprises cement, lime and the like, and has certain reinforcing effect, but has the problems of high production cost, large carbon emission, limited fixing effect on heavy metal ions and the like, and especially has difficulty in meeting the requirements of mechanical properties and environmental safety when treating heavy metal polluted soil. In face of the challenges, the metallurgical solid waste is used as a main raw material to develop the novel soil curing agent, so that the solid waste can be effectively consumed, the material cost is reduced, the self-gelation activity of the metallurgical solid waste and the synergistic effect of microelements can be brought into play, and the dual aims of soil body mechanics reinforcement and heavy metal stabilization are realized. Disclosure of Invention The application provides a metallurgical solid waste-based soil solidifying agent and application thereof, which are used for solving the technical problem of how to ensure that the soil solidifying agent has excellent mechanical property and high-efficiency heavy metal stabilization capability. In the first aspect, the embodiment of the application provides a metallurgical solid waste-based soil curing agent, which comprises, by mass, 38% -55% of steel slag micro powder, 30% -40% of mineral powder, 10% -17% of fly ash and 2% -5% of quicklime. Optionally, the chemical composition of the steel slag micro powder comprises 35-50% of CaO and 10-20% of SiO 2 in terms of mass fraction, wherein the specific surface area of the steel slag micro powder is more than or equal to 400m 2/kg. Optionally, the soil curing agent further comprises 2% -5% of an exciting agent in percentage by mass. Optionally, the exciting agent is water glass, and the modulus of the water glass is 2.2-3.0. Optionally, the grade of the mineral powder is more than or equal to S95. Optionally, the fly ash comprises class I fly ash and class II fly ash. Optionally, the CaO in the quicklime is more than or equal to 90 percent in mass fraction. In a second aspect, an embodiment of the present application provides an application of the soil solidifying agent described in the first aspect, where the application includes: the soil curing agent is prepared from 38-55% of steel slag micropowder, 30-40% of mineral powder, 10-17% of fly ash and 2-5% of quicklime; adding the soil curing agent into the soil body for mixing to obtain a mixed material; And compacting and curing the mixed materials in sequence to obtain a solidified soil body. Optionally, the mass of the soil curing agent is 4% -15% of the dry soil mass of the soil body. Optionally, if the soil body is roadbed filling soil, the mass of the soil curing agent is 6% -8% of the dry soil mass of the soil body. Optionally, if the soil body is a deep mixing pile or a gravity type solidification wall, the mass of the soil solidifying agent is 10% -12% of the mass of the dry soil of the soil body. Optionally, if the soil body is heavy metal polluted soil, the mass of the soil curing agent is 12% -15% of the mass of dry soil of the soil body. Optionally, if the soil body is heavy metal polluted soil, water glass is added into the soil body in the mixing process, wherein the mass of the water glass is 2.5% -5.0% of the mass of dry soil of the soil body. Optionally, the mixing device comprises at least one of a road mixer, a double-shaft mixer and a deep mixing pile machine. Optionally, the compaction degree of the compaction is more than or equal to 95%, and the curing period of the curing is more than or equal to 7d. Optionally, the unconfined compressive strength of the solidified soil 7d is more than or equal to 2MPa, and the leaching concentration of heavy metal Pb in the solidified soil is less than or equal to 5mg/L. Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: The embodiment of the application provides a metallurgical solid waste-based soil curing agent, which comprises, by mass, 38% -55% of steel slag micro powder, 30% -40% of minera