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CN-121974576-A - Steel slag-based cementing material and preparation method and application thereof

CN121974576ACN 121974576 ACN121974576 ACN 121974576ACN-121974576-A

Abstract

The invention relates to the technical field of solid waste recycling, in particular to a steel slag-based cementing material, a preparation method and application thereof. The raw materials of the steel slag-based cementing material comprise modified steel slag, gypsum, silicate cement and auxiliary materials, wherein the modified steel slag is obtained by mixing and reacting acid radical salt with the steel slag. The invention modifies the steel slag to reduce the content of free calcium and free magnesium in the steel slag and improve the activity of the steel slag, so that the obtained steel slag-based cementing material has good mechanical property, durability and stability and improves the utilization rate of the steel slag.

Inventors

  • ZHAO YI
  • ZENG CHENG
  • ZHANG CUIPING
  • LIN MINGHUI
  • YANG LIU
  • MA YINGYING
  • FAN XIAOYI
  • YANG XINYI

Assignees

  • 重庆交通大学

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The steel slag-based cementing material is characterized in that raw materials of the steel slag-based cementing material comprise modified steel slag, gypsum, silicate cement and auxiliary materials, and the modified steel slag is obtained by mixing and reacting acid radical salt with the steel slag.
  2. 2. The steel slag-based cementitious material of claim 1, wherein said acid salt comprises at least one of phosphate, silicate, sulfate, formate; and/or the auxiliary materials comprise at least one of nano silicon dioxide, steel fibers, basalt fibers and polypropylene fibers; And/or, the slag comprises at least one of blast furnace slag and granulated blast furnace slag; and/or the gypsum comprises at least one of phosphogypsum, natural gypsum and desulfurized gypsum.
  3. 3. The steel slag-based cement according to claim 2, wherein the mass ratio of the acid salt to the steel slag is (1-4) 100.
  4. 4. The steel slag-based cement according to claim 2, wherein the ratio of the total mass of slag and gypsum to the mass of acid salt is (5-37): 0.8-1; and/or the mass ratio of the auxiliary materials to the modified steel slag is (0.2-0.5): 100.
  5. 5. The steel slag-based cementitious material according to claim 2, wherein the mass ratio of silicate to formate is 1 (0.5-1); And/or the ratio of formate to the total mass of silicate cement and auxiliary materials is (4-20): 102-145.
  6. 6. A method of producing the steel slag-based cement according to any one of claims 1 to 5, comprising the steps of: Uniformly mixing the modified steel slag, the slag and the gypsum, crushing, adding auxiliary materials and silicate cement, and stirring to obtain the steel slag-based cementing material.
  7. 7. The method according to claim 6, wherein the pulverization treatment comprises mixing the modified steel slag, slag and gypsum, pulverizing to 20-100 mesh, and subjecting to carbon dioxide treatment to obtain a pulverized intermediate.
  8. 8. The method according to claim 7, wherein the carbon dioxide treatment comprises a treatment at a pressure of 0.5 to 1.2MPa and a temperature of 60 to 100 ℃ for 30 to 120 minutes.
  9. 9. The method according to claim 6 or 7, wherein the stirring treatment comprises stirring at 60-120rpm for 5-10min, adding water and standard sand, and stirring for 20-40min to obtain the steel slag-based cementitious material.
  10. 10. Use of the steel slag-based cement according to any one of claims 1 to 5 or the steel slag-based cement according to any one of claims 6 to 9 for the preparation of steel slag-based cement, characterized in that it is used for at least one of road bed paving and construction materials.

Description

Steel slag-based cementing material and preparation method and application thereof Technical Field The invention relates to the technical field of solid waste recycling, in particular to a steel slag-based cementing material, a preparation method and application thereof. Background With the steady improvement of the productivity of metallurgical industry, the steel slag is taken as the solid waste of the high-alkalinity industry, and the harmless treatment and the recycling of the steel slag are focused on in industry. At present, the accumulated steel slag accumulation amount in China exceeds 10 hundred million tons, the annual discharge amount is about 1 hundred million tons, but the comprehensive utilization rate is only about 30 percent, and a large amount of accumulation occupies land resources, generates maintenance cost and can cause soil and water pollution due to heavy metal leakage. Meanwhile, the traditional cement-based material production process has high carbon emission, does not meet the development target of double carbon, and the application of industrial solid wastes such as steel slag in the cementing material can realize 30-50% carbon emission reduction, but is faced with the bottleneck that the mixing amount of the solid wastes and the high performance are difficult to be compatible for a long time. In the prior art, physical and chemical methods such as flotation, acid leaching, grinding and aging are adopted to improve the property of the steel slag so as to improve the utilization rate of the steel slag, but the chemical components of the steel slag from different sources are obviously different, the content of free calcium oxide and free magnesium oxide in the steel slag is limited by the reduction, the hydration activity and stability of the steel slag can be influenced, and the activity is low, so that the use is limited. Disclosure of Invention In view of the above, the invention provides a steel slag-based cementing material, a preparation method and application thereof, wherein the steel slag is modified to reduce the content of free calcium and free magnesium in the steel slag and improve the activity of the steel slag, so that the obtained steel slag-based cementing material has good mechanical property, durability and stability, and the utilization rate of the steel slag is improved. In a first aspect, the invention provides a steel slag-based cementing material, which is prepared by mixing and reacting acid radical salt with steel slag, wherein the raw materials of the steel slag-based cementing material comprise modified steel slag, gypsum, silicate cement and auxiliary materials. The steel slag-based cementitious material, wherein the acid salt comprises at least one of phosphate, silicate, sulfate and formate; and/or the auxiliary materials comprise at least one of nano silicon dioxide, steel fibers, basalt fibers and polypropylene fibers; And/or, the slag comprises at least one of blast furnace slag and granulated blast furnace slag; and/or the gypsum comprises at least one of phosphogypsum, natural gypsum and desulfurized gypsum. The steel slag-based cementing material is characterized in that the mass ratio of the acid radical salt to the steel slag is (1-4) 100. The ratio of the total mass of slag and gypsum to the mass of acid radical salt is (5-37) (0.8-1); and/or the mass ratio of the auxiliary materials to the modified steel slag is (0.2-0.5): 100. The steel slag-based cementing material is characterized in that the mass ratio of silicate to formate is 1 (0.5-1); And/or the ratio of formate to the total mass of silicate cement and auxiliary materials is (4-20): 102-145. In a second aspect, the invention provides a method for preparing the steel slag-based cementing material, which comprises the following steps: Uniformly mixing the modified steel slag, the slag and the gypsum, crushing, adding auxiliary materials and silicate cement, and stirring to obtain the steel slag-based cementing material. The preparation method comprises the steps of mixing modified steel slag, slag and gypsum, crushing to 20-100 meshes, and carrying out carbon dioxide treatment to obtain a crushed intermediate. The preparation method comprises the step of treating the carbon dioxide for 30-120min under the conditions of the pressure of 0.5-1.2MPa and the temperature of 60-100 ℃. The preparation method comprises the steps of stirring for 5-10min under the condition of 60-120rpm, adding water and standard sand, and stirring for 20-40min to obtain the steel slag-based cementing material. In a third aspect, the invention provides an application of the steel slag-based cementing material, which is applied to at least one of roadbed paving and building materials. The invention adopting the scheme has at least the following beneficial effects: According to the application, the content of free calcium and free magnesium in the steel slag can be reduced by modifying the steel slag by acid radical