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CN-121974593-A - Composite excitant, titanium extraction tailings-based cementing material using composite excitant and preparation method

CN121974593ACN 121974593 ACN121974593 ACN 121974593ACN-121974593-A

Abstract

The invention discloses a composite excitant, a titanium extraction tailings-based cementing material using the composite excitant and a preparation method thereof, and belongs to the technical field of building engineering materials. The composite activator comprises, by mass, 19-27% of calcium sulfoaluminate cement, 17-38% of aluminum sulfate, 2-16% of calcium formate, 0-17% of sodium silicate and 16-42% of copperas. The composite activator is mixed into a basic gelling system consisting of titanium extraction tailings, titanium gypsum, cement and lime according to the proportion of 1% -5%, and the median particle diameter D 50 of the mixed powder is smaller than 15 mu m through a co-grinding process. In order to solve the problems of slow development of early strength and generally low performance of the titanium extraction tailings-based cementing material, the invention utilizes the synergistic excitation effect among the components in the composite exciting agent to promote rapid formation of ettringite and acceleration of hydration reaction, effectively solves the technical bottleneck of low early strength of the traditional titanium extraction tailings-based cementing material while realizing high-efficiency utilization of solid waste in the titanium extraction industry, and is suitable for occasions with high requirements on early strength, such as mine filling, roadbed engineering and the like.

Inventors

  • MA KUI
  • Xu Benke
  • 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 (7)

  1. 1. A composite activator, characterized in that: The cement comprises, by mass, 19-27% of calcium sulfoaluminate cement, 17-38% of aluminum sulfate, 2-16% of calcium formate, 0-17% of sodium silicate and 16-42% of copperas.
  2. 2. A titanium extraction tailings-based cementing material, using the composite activator of claim 1, characterized in that: the composite activator comprises, by mass, 50-65% of titanium extraction tailings, 18-25% of titanium gypsum, 5-20% of cement, 3-10% of lime and 1-5% of composite activator.
  3. 3. The titanium-extracted tailings-based cement according to claim 2, wherein: the titanium gypsum is titanium gypsum which removes free water on the surface and maintains the crystal structure of calcium sulfate dihydrate.
  4. 4. The titanium-extracted tailings-based cement according to claim 2, wherein: The cement is Portland cement with P.I. of 42.5.
  5. 5. The method for preparing the titanium extraction tailings-based cementing material according to any one of claims 2 to 4, which is characterized by comprising the following steps: And (3) the cement, lime, titanium extraction tailings, titanium gypsum and a compound activator are jointly placed in a ball mill according to the measurement to carry out co-grinding treatment, and the co-ground mixed powder is homogenized by a powder homogenizer to obtain the titanium extraction tailings-based cementing material.
  6. 6. The method for preparing the titanium extraction tailings-based cementing material according to claim 5, wherein the method comprises the following steps: The median diameter D 50 of the mixed powder after the co-grinding treatment is smaller than 15 mu m.
  7. 7. The method for preparing the titanium extraction tailings-based cementing material according to claim 5, wherein the method comprises the following steps: The titanium extraction tailings are measured according to the weight of dry basis.

Description

Composite excitant, titanium extraction tailings-based cementing material using composite excitant and preparation method Technical Field The invention belongs to the technical field of building engineering materials, and particularly relates to a composite excitant, a titanium extraction tailings-based cementing material using the composite excitant and a preparation method thereof. Background Vanadium titano-magnetite in Panxi area of China has rich resources, and generates unique high titanium blast furnace slag in the smelting process. In order to recycle the titanium resource, the prior art develops a process of extracting titanium by high-temperature carbonization-low-temperature chlorination. However, the process can produce a large amount of titanium extraction tailings as a byproduct, about 85% of blast furnace slag after titanium extraction is converted into the tailings, the titanium extraction tailings have complex components, generally contain 2.5-4wt% of chloride ions, and have finer particle size and lower activity. Although the titanium extraction tailings can be piled up as class II general industrial solid waste, if the titanium extraction tailings are simply piled up, a large amount of land is occupied, and more serious, under the action of rain water leaching, chloride ions in the titanium extraction tailings are slowly released and migrate, so that the environment of surrounding soil and water forms a persistent environmental pollution risk, and the disposal problem of the titanium extraction tailings becomes a key environmental protection problem for restricting the sustainable development of the blast furnace slag titanium extraction industry. On the other hand, the current traditional building material field is severely dependent on cementing materials represented by ordinary portland cement. The cement production needs to exploit a large amount of non-renewable resources such as natural limestone, clay and the like, and the clinker calcination process is an important link with high energy consumption and amplified carbon dioxide emission, which is contrary to the 'two-carbon' strategy and the green low-carbon development concept which are carried out in the current country. With the tightening of resource constraints and the increasing strictness of environmental protection requirements, the search for alternative cementing materials with low environmental load and high performance has become an urgent requirement of the building material industry. Aiming at the problems, in the prior art, a few researches are conducted in the recycling direction of titanium extraction tailings serving as auxiliary cementing materials or main raw materials, for example, chinese patent CN118388200A discloses a titanium extraction tailings-based full-tailing filling cementing material and a preparation method thereof, and the filling cementing material comprises titanium extraction tailings, titanium gypsum, cement and lime, and aims to cooperatively treat various solid wastes and improve the performance of the filling cementing material through compounding and adjusting the formula proportion, so that a preliminary idea is provided for recycling the titanium extraction tailings. However, for the prior art, including the patent proposal disclosed by CN118388200A, there is a remarkable common defect that the prepared titanium extraction tailings-based cementing material has slow early strength development and generally lower performance. Because the self-gelation activity of the titanium extraction tailings is limited, even though the titanium extraction tailings are subjected to physical grinding or are compounded with a small amount of alkaline excitants such as lime, the hydration reaction rate is still low, so that the early compressive strength of the material within 3 days or 7 days is difficult to meet the urgent requirements of a plurality of practical projects, and particularly, the titanium extraction tailings are applied to short-term projects such as rapid construction, early bearing filling projects, rush repair projects and the like. The defect of insufficient early strength severely restricts the application range and market acceptance of the material, and becomes a main technical bottleneck for realizing large-scale commercial popularization. Disclosure of Invention The invention mainly aims to provide a composite excitant, a titanium extraction tailings-based cementing material using the composite excitant and a preparation method thereof, and the composite excitant is prepared on the basis of the resource utilization problem of original Fang Jiejue titanium extraction tailings and titanium gypsum solid waste treatment, and has high early strength and simple and easy processing technology. The first aspect of the invention provides a composite excitant, which comprises the following components in percentage by mass: 19-27 wt% of calcium sulfoaluminate cement, 17-38 wt% of aluminum sulf