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CN-121225897-B - Organic acid-excited solid waste-based cementing material

CN121225897BCN 121225897 BCN121225897 BCN 121225897BCN-121225897-B

Abstract

The disclosure provides an organic acid-excited solid waste-based cementing material, belonging to the technical field of solid waste utilization. The organic acid-excited solid waste-based cementing material comprises 90-105 parts by mass of a silicon-aluminum solid waste base material, 7-12 parts by mass of sulfate and 15.3-19.8 parts by mass of a compound organic acid excitant, wherein the compound organic acid excitant comprises main acid and polyacrylic acid, the mass of the polyacrylic acid is 10-40% of that of the main acid, and the main acid is one or a mixture of citric acid and tartaric acid. The solid waste-based cementing material excited by the organic acid avoids the adoption of strong alkali as an exciting agent and avoids the defect of a strong alkali excitation system.

Inventors

  • WANG ZHEN
  • GENG JIUGUANG
  • XU FAN
  • HE ZEWEN
  • LAN HUI

Assignees

  • 西安银鼎科技有限公司
  • 长安大学

Dates

Publication Date
20260512
Application Date
20251128

Claims (9)

  1. 1. The organic acid-excited solid waste-based cementing material is characterized by comprising 90-105 parts by mass of a silicon-aluminum solid waste base material, 7-12 parts by mass of sulfate and 15.3-19.8 parts by mass of a composite organic acid excitant; the compound organic acid excitant consists of main acid, auxiliary acid and polyacrylic acid, wherein the mass of the polyacrylic acid is 10% -40% of that of the main acid, the main acid is one or a mixture of citric acid and tartaric acid, the auxiliary acid is one or a mixture of more of oxalic acid, malic acid, gluconic acid and ascorbic acid, and the mass of the auxiliary acid is 20% -80% of that of the main acid.
  2. 2. The organic acid-excited solid waste-based cement material according to claim 1, wherein the mass of the polyacrylic acid is 20% -35% of the mass of the main acid, and the mass of the auxiliary acid is 40% -70% of the mass of the main acid.
  3. 3. The organic acid-excited solid waste-based cement material according to claim 1, wherein the composite organic acid-excited agent is a mixture of citric acid, oxalic acid and polyacrylic acid, and the mass of the citric acid is equal to the mass of the oxalic acid and the mass of the polyacrylic acid= (3.8-4.2) and (1.8-2.2) is equal to 1.
  4. 4. The organic acid-activated solid waste-based cement according to claim 1, wherein the sulfate has an SO 3 content of not less than 38% and a specific surface area of not less than 500m 2/kg.
  5. 5. The organic acid-activated solid waste-based cementitious material of claim 1, wherein the sulfate is one or a mixture of two of desulfurized gypsum and phosphogypsum.
  6. 6. The organic acid-activated solid waste-based cementing material according to any one of claims 1 to 5, wherein the silicon-aluminum solid waste base material comprises high-calcium solid waste micro powder and low-calcium high-silicon-aluminum solid waste micro powder, wherein the mass of the low-calcium high-silicon-aluminum solid waste micro powder is 0.4 to 2.5 times that of the high-calcium solid waste micro powder; The CaO content of the high-calcium solid waste micro powder is not less than 15 percent, and the CaO content of the low-calcium high-silicon aluminum solid waste micro powder is less than 15 percent.
  7. 7. The organic acid-activated solid waste-based cement according to claim 6, wherein the high-calcium solid waste fine powder comprises one or more of blast furnace slag fine powder, steel slag fine powder, and carbide slag fine powder.
  8. 8. The organic acid-activated solid waste-based cementitious material of claim 6, wherein the low-calcium high-silica alumina solid waste micropowder comprises one or more of fly ash, coal gangue micropowder, red mud micropowder, and metakaolin micropowder.
  9. 9. The organic acid-activated solid waste-based cement according to claim 6, wherein the D90 particle size of the aluminous solid waste binder is not more than 20 microns.

Description

Organic acid-excited solid waste-based cementing material Technical Field The disclosure relates to the technical field of solid waste utilization, in particular to a solid waste-based cementing material excited by organic acid. Background Along with the development of the strategy of double carbon, the preparation of green gelling materials by utilizing industrial solid wastes to replace traditional cements has become a research hotspot. In current research, solid waste is typically used to prepare alkali-activated gelling materials. The alkali-activated cementing material mainly adopts solid wastes such as fly ash, blast furnace slag, carbide slag and the like, and generates a cementing product under the action of a strong alkali excitant (such as sodium silicate, sodium hydroxide, slaked lime and the like). However, the strong alkali excitant has the problems of strong corrosiveness, high energy consumption, large carbon emission in the preparation process, easy alkali aggregate reaction and the like. In recent years, there have been studies on the use of sulfates (such as desulfurized gypsum) or other weak base substances as an activator, but they have disadvantages such as low excitation efficiency and slow development of early strength. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of Invention The purpose of the present disclosure is to overcome the shortcomings of the prior art, and provide an organic acid-excited solid waste-based cementing material, which avoids using strong alkali as an exciting agent. The invention provides an organic acid-excited solid waste-based cementing material which comprises 90-105 parts by mass of a silicon-aluminum solid waste base material, 7-12 parts by mass of sulfate and 15.3-19.8 parts by mass of a composite organic acid excitant; the composite organic acid excitant comprises main acid and polyacrylic acid, wherein the mass of the polyacrylic acid is 10% -40% of that of the main acid, and the main acid is one or a mixture of citric acid and tartaric acid. According to one embodiment of the disclosure, the compound organic acid excitant further comprises auxiliary acid, wherein the auxiliary acid is one or a mixture of more of oxalic acid, malic acid, gluconic acid and ascorbic acid, and the mass of the auxiliary acid is 20% -80% of that of the main acid. According to one embodiment of the present disclosure, the mass of the polyacrylic acid is 20% -35% of the mass of the main acid, and the mass of the auxiliary acid is 40% -70% of the mass of the main acid. According to one embodiment of the disclosure, the compound organic acid excitant is a mixture of citric acid, oxalic acid and polyacrylic acid, wherein the mass of the citric acid is equal to the mass of the oxalic acid, the mass of the polyacrylic acid is equal to the mass of the polyacrylic acid= (3.8-4.2): (1.8-2.2): 1. According to one embodiment of the present disclosure, the sulfate has an SO 3 content of not less than 38% and a specific surface area of not less than 500 m2/kg. According to one embodiment of the present disclosure, the sulfate is one or a mixture of both of desulfurized gypsum and phosphogypsum. According to one embodiment of the disclosure, the silicon-aluminum solid waste base material comprises high-calcium solid waste micro powder and low-calcium high-silicon-aluminum solid waste micro powder, wherein the mass of the low-calcium high-silicon-aluminum solid waste micro powder is 0.4-2.5 times of that of the high-calcium solid waste micro powder; The CaO content of the high-calcium solid waste micro powder is not less than 15 percent, and the CaO content of the low-calcium high-silicon aluminum solid waste micro powder is less than 15 percent. According to one embodiment of the present disclosure, the high-calcium solid waste micropowder includes one or more of blast furnace slag micropowder, steel slag micropowder, and carbide slag micropowder. According to one embodiment of the disclosure, the low-calcium high-silicon aluminum solid waste micro powder comprises one or more of fly ash, coal gangue micro powder, red mud micro powder and metakaolin micro powder. According to one embodiment of the present disclosure, the D90 particle size of the aluminous solid waste binder is no greater than 20 microns. In the invention, the traditional strong base/strong acid excitation path is abandoned, a composite organic acid system is adopted, and a plurality of long-term coexistence technical problems of activity excitation, reaction control, volume stability, durability and the like are solved through a synergistic mechanism of 'proton exchange-complexation control'. Instead of using strong alkali or strong inorganic acid to excite the solid waste base stock,