Low-cost four-element system cementitious material, preparation method and application thereof

Patent metadata

Field	Value
Publication number	US-2024208861-A1
Application number	US-202318390620-A
Country	US
Kind code	A1
Filing date	Dec 20, 2023
Priority date	Dec 24, 2022
Publication date	Jun 27, 2024
Grant date	—

Abstract

A low-cost four-element system cementitious material, a preparation method and an application thereof are provided by the present disclosure, and the cementitious material is used in the fields of mine cementing filling and building materials. The four-element system cementitious material includes the following raw materials in percentage by mass: 20-60% of water-quenched blast furnace slag, 10-40% of waste incineration bottom ash, 20% of pretreated waste incineration fly ash and the balance of desulfurization gypsum. The low-cost four-element system cementitious material is used to replace cement to prepare mine cementing filling materials, and is also used to prepare concrete materials for construction industry.

First claim

What is claimed is:

1 . A low-cost four-element system cementitious material, comprising following raw materials in percentage by mass according to 100% by mass of the low-cost four-element system cementitious material: 20-60% of water-quenched blast furnace slag, 10-40% of waste incineration bottom ash, 20% of pretreated waste incineration fly ash and a balance of desulfurization gypsum.

2 . The low-cost four-element system cementitious material according to claim 1 , wherein according to a mass percentage, in the pretreated waste incineration fly ash, a content of CaO is ≥45%, a content of Cl is ≥20%, a content of Na 2 O is ≥10%, a content of SiO 2 is ≥3%, and a content of Al 2 O 3 is ≥2%.

3 . The low-cost four-element system cementitious material according to claim 1 , wherein according to a mass percentage, in the waste incineration bottom ash, a content of SiO 2 is ≥32%, a content of CaO is ≥30%, a content of Al 2 O 3 is ≥7%, a content of Fe 2 O 3 is ≥5%, and a content of Na 2 O is ≥2%.

4 . The low-cost four-element system cementitious material according to claim 1 , wherein according to a mass percentage, in the water-quenched blast furnace slag, a content of CaO is ≥35%, a content of SiO 2 is ≥28%, a content of Al 2 O 3 is ≥12%, and a content of MgO is ≥5%.

5 . The low-cost four-element system cementitious material according to claim 1 , wherein according to a mass percentage, in the desulfurization gypsum, a content of CaO is ≥45%, and a content of SO 3 is ≥40%.

6 . The low-cost four-element system cementitious material according to claim 1 , wherein a specific surface area of the water-quenched blast furnace slag is 450-500 m 2 /kg, a specific surface area of the pretreated waste incineration fly ash is ≥500 m 2 /kg, a specific surface area of the waste incineration bottom ash is 400-450 m 2 /kg, and a specific surface area of the desulfurization gypsum is 450-500 m 2 /kg.

7 . A preparation method of the low-cost four-element system cementitious material according to claim 1 , comprising following steps:
S1, carrying out water washing pretreatment on waste incineration fly ash to obtain a pretreated waste incineration fly ash; S2, uniformly mixing the pretreated waste incineration fly ash with waste incineration bottom ash, water-quenched blast furnace slag and desulfurization gypsum according to a mass ratio to obtain a four-element system cementitious material; and S3, mixing water with the four-element system cementitious material of low-cost according to a mass ratio of (1-2):5 to prepare a cementitious material.

Assignees

• Univ Beijing Science & Technology

Inventors

• Zhang Siqi
• Zhao Tong
• Yang Huifen
• Ni Wen
• Wu Zeping
• Li Yue
• Li Jia
• Li Keqing
• Fu Pingfeng
• Li Yunyun
• Chen Xiang
• Liu Yuhang
• Guan Dongshang
• Wang Jiajia
• Sun Qiwei

Classifications

• C04B2111/1037

  Cement free compositions, e.g. hydraulically hardening mixtures based on waste materials, not containing cement as such · CPC title

• C04B28/08 Primary

  Slag cements · CPC title

• C04B40/0046

  characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures · CPC title

• C04B28/144

  the synthetic calcium sulfate being a flue gas desulfurization product · CPC title

• C04B28/082

  Steelmaking slags; Converter slags · CPC title