Search

CN-121974578-A - Solid waste-based cementing material and preparation method and application thereof

CN121974578ACN 121974578 ACN121974578 ACN 121974578ACN-121974578-A

Abstract

The invention provides a solid waste-based cementing material, a preparation method and application thereof, and relates to the technical field of building materials. The solid waste-based cementing material comprises, by weight, 35-45 parts of slag, 25-35 parts of modified oil shale slag, 15-25 parts of desulfurized gypsum and 1-12 parts of modifier, wherein the modifier comprises calcium hydroxide and high belite sulphoaluminate cement. The solid waste-based cementing material can regulate and control the setting time of the solid waste-based cementing material according to actual engineering requirements on the premise of ensuring that the solid waste-based cementing material has high strength in the early stage and the later stage. Meanwhile, the main raw materials adopted by the invention are industrial solid wastes, so that the industrial solid wastes can be stably and proportionally utilized, the high-efficiency utilization of industrial solid waste resources is realized, and the cement strength standard of P.O 42.5.5 can be reached by only adding a small amount of performance modifier, thereby remarkably reducing the production cost and reducing the environmental pressure.

Inventors

  • WU SIZE
  • LIU XIAOMIN
  • Sun qixing
  • LI XIN
  • WANG ZHONGCUN

Assignees

  • 辽宁贝泽能源有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The solid waste-based cementing material is characterized by comprising, by weight, 35-45 parts of slag, 25-35 parts of modified oil shale slag, 15-25 parts of desulfurized gypsum and 1-12 parts of modifier; Wherein the modifier comprises calcium hydroxide and high belite sulphoaluminate cement.
  2. 2. The solid waste-based cementing material according to claim 1, wherein the mass ratio of the calcium hydroxide to the high belite sulphoaluminate cement is (1-5): 1-5.
  3. 3. The solid waste-based cementing material according to claim 1, wherein the solid waste-based cementing material further comprises 0-25 parts of steel slag; Preferably, the modifier further comprises diethanolamine; Preferably, the mass ratio of the calcium hydroxide to the high belite sulphoaluminate cement to the diethanolamine is (1-5): 0-0.05.
  4. 4. The solid waste-based cementitious material of claim 1, wherein the modified oil shale residue is prepared by: Crushing the oil shale slag, and calcining to obtain the modified oil shale slag; Preferably, the temperature rising speed of the calcination treatment is 5-15 ℃ per minute, the temperature of the calcination treatment is 500-800 ℃, and the time of the calcination treatment is 0.5-2 hours.
  5. 5. A method for preparing the solid waste-based cementitious material according to any one of claims 1 to 4, comprising: Ball milling is carried out on slag, modified oil shale slag and desulfurized gypsum respectively to obtain slag powder, modified oil shale slag powder and desulfurized gypsum powder; And mixing slag powder, modified oil shale powder, desulfurized gypsum powder and modifier to obtain the solid waste-based cementing material.
  6. 6. The method for preparing a solid waste-based cementitious material according to claim 5, wherein the slag powder has a particle size D 50 of 9 to 18 μm; preferably, the slag is further dried before ball milling, wherein the drying temperature is 100-110 ℃, and the drying time is 12-36 hours; Preferably, the ball milling process parameters of the slag comprise the rotation speed of ball milling is 35-55 rpm, the ball milling time is 0.5-2 h, the grinding balls used for ball milling are steel balls and/or steel forgings, and the ball-to-material ratio is 1 (0.01-0.05); Preferably, the granularity D 50 of the modified oil shale residue powder is 15-28 mu m; preferably, the ball milling process parameters of the modified oil shale slag comprise the rotation speed of ball milling is 35-55 rpm, the ball milling time is 0.3-1.2 h, the grinding balls used for ball milling are steel balls and/or steel forgings, and the ball-to-material ratio is 1 (0.01-0.05); preferably, the granularity D 50 of the desulfurization gypsum powder is 16-25 mu m; preferably, the desulfurized gypsum is further dried before ball milling, the drying temperature is 40-50 ℃, and the drying time is 12-36 hours; Preferably, the ball milling process parameters of the desulfurized gypsum comprise the rotation speed of ball milling of 35-55 rpm, the ball milling time of 0.1-0.5 h, the grinding balls used for ball milling are steel balls and/or steel forgings, and the ball-to-material ratio is 1 (0.01-0.05).
  7. 7. The method for producing a solid waste-based cementitious material according to claim 5, wherein when the solid waste-based cementitious material further includes steel slag, the method further comprises: ball milling the steel slag to obtain steel slag powder; preferably, the granularity D 50 of the steel slag powder is 15-25 mu m; preferably, the ball milling process parameters of the steel slag comprise the rotation speed of ball milling of 35-55 rpm, the ball milling time of 0.5-1.5 h, the grinding balls used for ball milling are steel balls and/or steel forgings, and the ball-to-material ratio is 1 (0.01-0.05).
  8. 8. The method for preparing a solid waste-based cementing material according to claim 5, wherein the rotation speed of the mixing is 35-55 rpm, and the mixing time is 12-36 h.
  9. 9. Use of the solid waste-based cementitious material according to any one of claims 1 to 4, or the solid waste-based cementitious material prepared by the preparation method of any one of claims 5 to 8, in the preparation of building materials.
  10. 10. The cement mortar is characterized by comprising the solid waste-based cementing material according to any one of claims 1-4 or the solid waste-based cementing material prepared by the preparation method of the solid waste-based cementing material according to any one of claims 5-8.

Description

Solid waste-based cementing material and preparation method and application thereof Technical Field The invention relates to the technical field of building materials, in particular to a solid waste base cementing material, a preparation method and application thereof. Background Along with the sustainable development of the China industry, the contents and the types of industrial byproducts such as slag, steel slag, oil shale waste, coal gangue, red mud, fly ash, desulfurized gypsum and the like are increased. At present, the large amount of solid waste in the industry is discharged in a large amount, the utilization rate is low, if the effective resource utilization is not obtained, the long-term piling can occupy land resources, increase the enterprise cost, and the soil, the atmosphere, the water source and the like are easy to cause serious pollution, so that the personal safety of people is seriously influenced. Along with the continuous promotion of the 'double carbon' target, the cement industry will eventually incorporate a carbon transaction system, and the carbon emission reduction of the cement industry is not slow. The solid waste base cementing material is a novel hydraulic cementing material which is prepared by grinding and processing slag, oil shale slag, industrial auxiliary gypsum and other industrial solid wastes serving as main raw materials according to a certain proportion. Under the background of double carbon, the resource utilization of solid waste has become one of the important points of research, most of the solid waste has potential activity and gelation, and the solid waste-based cementing material or the full solid waste cementing material prepared by using the solid waste replaces the traditional cement, thereby providing a key technical route for carbon emission reduction and realization of double carbon targets in the cement industry. However, most solid waste-based binders still exist in the form of alkali-activated binders. The mixing amount of the exciting agent required by the alkali-activated cementing material accounts for about 10 percent of the cementing material, and the mixing amount is relatively high, so that the problems of alkali efflorescence, later-stage strength collapse, large shrinkage, easiness in cracking and the like are easily caused. The conventional exciting agent mainly comprises sodium hydroxide, sodium silicate and the like, and has high cost. In addition, the solid waste-based cementing material has low early strength and long setting time, which are main reasons for limiting the large-scale popularization and application of the solid waste-based cementing material. Therefore, how to effectively improve the early strength of the solid waste-based cementing material, regulate and control the setting time, reduce the consumption of the exciting agent and realize the large-scale application of the solid waste-based cementing material is a technical problem which needs to be overcome currently in the field. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a solid waste-based cementing material, a preparation method and application thereof, wherein the solid waste-based cementing material can regulate and control the setting time of the solid waste-based cementing material according to actual engineering requirements on the premise of ensuring that the solid waste-based cementing material has high strength in the early stage and the later stage. Meanwhile, the main raw materials adopted by the invention are industrial solid wastes, so that the industrial solid wastes such as oil shale slag, slag and steel slag can be utilized stably and in a large proportion, the high-efficiency utilization of industrial solid waste resources is realized, the waste is changed into valuable really, the strength standard of P.O 42.5.5 cement can be reached only by adding a small amount of performance modifier, the production cost is obviously reduced, the environmental pressure is reduced, the construction of an environment-friendly society is facilitated, and the sustainable development of oil shale and steel industries is promoted more effectively. In order to achieve the above object of the present invention, the following technical solutions are specifically adopted: The invention provides a solid waste-based cementing material, which comprises, by weight, 35-45 parts of slag, 25-35 parts of modified oil shale slag, 15-25 parts of desulfurized gypsum and 1-12 parts of modifier; Wherein the modifier comprises calcium hydroxide and high belite sulphoaluminate cement. Further, the mass ratio of the calcium hydroxide to the high belite sulphoaluminate cement is (1-5) to (1-5). Further, the solid waste-based cementing material also comprises 0-25 parts of steel slag. Further, the modifier also comprises diethanolamine. Further, the mass ratio of the calcium hydroxide to the high belite sulphoaluminate cement to