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CN-121974616-A - Composite cementing material with chloride ion stability and preparation method and application thereof

CN121974616ACN 121974616 ACN121974616 ACN 121974616ACN-121974616-A

Abstract

The invention belongs to the field of solid waste recycling application, and particularly relates to a composite cementing material with chloride ion stability, and a preparation method and application thereof. In order to solve the problems that the traditional disposal mode of chlorine-containing solid wastes damages environmental resource waste and the material performance is reduced due to the doping of the chlorine-containing solid wastes in the prior art, the invention provides a composite cementing material with chloride ion stability, and a preparation method and application thereof. The formula has the advantages of low cement occupancy rate, large chloride slag consumption, high solid waste utilization rate, strong chloride ion stability and certain compressive strength, can be used for wall materials, slope treatment and mine restoration, provides a new idea for the treatment and utilization of the chloride slag, and provides technical support for the resource utilization of the titanium-containing blast furnace slag in China.

Inventors

  • MA KUI
  • Xu Benke
  • Chu Guanrun
  • HAO JIANZHANG
  • YUE HAIRONG
  • LI MING

Assignees

  • 四川大学
  • 攀钢集团研究院有限公司

Dates

Publication Date
20260505
Application Date
20251218

Claims (9)

  1. 1. A composite cementing material with chloride ion stability is characterized in that: the composite cementing material comprises, by weight, 20-40 parts of chloride slag, 15-25 parts of carbide slag, 15-25 parts of cement and 20-30 parts of aluminum-rich auxiliary cementing material.
  2. 2. The composite cementitious material with chloride ion stability of claim 1, wherein: The chloridized slag comprises 22.12-29.91wt% of calcium oxide, 22.69-31.46 wt% of silicon dioxide, 12.32-13.90 wt% of aluminum oxide, 6.76-8.78 wt% of magnesium oxide, 5.98-10.69 wt% of titanium dioxide, 2-4 wt% of titanium carbide, 0.5-1.5 wt% of titanium nitride, 0.71-0.81 wt% of manganese oxide, 0.41-1.30 wt% of sulfur trioxide, 3.17-4.05 wt% of ferric oxide and 2.5-4wt% of chloride ions, and the granularity of the chloridized slag is 20-240 mu m.
  3. 3. The composite cementitious material with chloride ion stability of claim 1, wherein: The calcium oxide content in the carbide slag is 60-70wt%, the grain size of the carbide slag is 10-100 mu m, and the cumulative distribution d 90 of the grain size is less than or equal to 135 mu m.
  4. 4. The composite cementitious material with chloride ion stability of claim 1, wherein: the cement is silicate cement and comprises 36-60wt% of tricalcium silicate and 15-37wt% of dicalcium silicate.
  5. 5. The composite cementitious material with chloride ion stability of claim 1, wherein: the aluminum-rich auxiliary cementing material is kaolin and/or metakaolin.
  6. 6. The method for preparing a composite gel material with chloride ion stability according to any one of claims 1 to 5, comprising the steps of: S1, mixing and stirring the chloride slag, carbide slag, cement and aluminum-rich auxiliary cementing material to obtain a composite cementing material; s2, adding water into the composite cementing material obtained in the step S1, stirring, and sequentially carrying out die filling, forming and maintenance.
  7. 7. The method for preparing the composite cementing material with chloride ion stability according to claim 6, wherein the method comprises the following steps: And (2) adding water and stirring, wherein the water-solid ratio is 0.2-0.5.
  8. 8. The method for preparing the composite cementing material with chloride ion stability according to claim 6, wherein the method comprises the following steps: and (2) curing, wherein the temperature condition is 20+/-1 ℃, the relative humidity RH is more than or equal to 90%, and the curing time is 7-28 days.
  9. 9. Use of the composite cementitious material with chloride ion stability according to any one of claims 1-8 in wall materials, slope management and mine restoration.

Description

Composite cementing material with chloride ion stability and preparation method and application thereof Technical Field The invention belongs to the field of solid waste recycling application, and particularly relates to a composite cementing material with chloride ion stability, and a preparation method and application thereof. Background As an important titanium resource base in China, the Sichuan Panxi area has rich titanium resource reserves, and about 54 weight percent of titanium resources are reserved in the magnetic titanomagnetite. In the process of magnetic separation and enrichment of iron ore concentrate, titanium element easily enters a blast furnace smelting system along with the iron ore concentrate, and finally titanium-containing blast furnace slag is formed in slag, so that precious titanium resources cannot be directly recovered and white loss is caused. In order to realize recycling of titanium resources, the prior art adopts a high-temperature carbonization-low-temperature chlorination process, and the process can effectively extract titanium in titanium-containing blast furnace slag, but can produce byproduct low-temperature chlorination slag. The chloride ion content in the waste residue is up to 2.5-4wt%, and the chlorine ion is slowly dissolved out under the action of rain wash and soaking in the existing disposal mode mainly adopted for open-air heap disposal, so that soil salinization is caused, underground water is polluted, and long-term hidden danger is brought to ecological environment. Meanwhile, a large amount of carbide slag is generated in the acetylene production process by the calcium carbide method, and the main component of the carbide slag is calcium oxide and a certain amount of chloride ion residues are accompanied. As typical industrial solid waste, the traditional disposal mode of carbide slag is mainly stacking in open air, which not only occupies a large amount of land resources, but also damages the acid-base balance of soil and pollutes the surrounding water body by leaching and infiltration of rainwater, further aggravates the environmental bearing pressure, and the large-scale disposal and recycling of two industrial solid wastes become the industrial problems to be solved urgently. On the other hand, along with the rapid promotion of the urban process in China, the demand of the building industry for cement is continuously increased. At present, common Portland cement widely used is produced by using natural limestone as a main raw material. However, in recent years, the country applies strict mining limiting policies to natural mineral resources to protect ecological environment, so that limestone raw materials are supplied in tension, the price is greatly increased, and the cement production cost is directly increased. More importantly, a large amount of carbon dioxide is released in the cement production process, and is one of the main sources of global greenhouse gas emission. Aiming at the problems, the treatment of the chloridized slag and the carbide slag in the prior art is mostly in the aspect of simple stockpiling or low value-added utilization, and an effective way for realizing large-scale and high-value recycling is lacking, while in the cement industry, in order to cope with the pressure of resources and environment, partial industrial waste residues are tried to be adopted to replace natural raw materials, but the existing replacement technology is difficult to adapt to the mixing of chlorine-containing solid waste, and the cementing material is easy to have the durability problems of strength attenuation, cracking, pulverization and the like under the condition of chlorine-containing environment or raw material chlorine, so that the product performance cannot meet the engineering application requirements, and the large-scale popularization is difficult to realize. CN114057415A discloses a multi-solid waste gel filling material and application in the field of mine filling, but the chlorine-fixing efficiency is low, and the compression strength of the obtained filling material is also low, so that a composite cementing material which can reduce the cement consumption, is compatible with chlorine-containing industrial solid waste, realizes the resource utilization of the cement, has the stability of chloride ions, becomes a key direction for solving the pollution of the chlorine-containing solid waste and relieving the environmental pressure of resources in the cement industry, and has important economic benefit, environmental benefit and social benefit. Disclosure of Invention The invention aims to prepare a cementing material with low cement usage amount, and provides a composite cementing material with chloride ion stability, a preparation method and application thereof, which not only can realize the recycling of solid wastes, but also has good mechanical strength, and can be used for wall materials, slope treatment and mine restoration. In