High-strength glass-ceramic-based lightweight aggregates and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11780776-B2
Application number	US-202318097346-A
Country	US
Kind code	B2
Filing date	Jan 16, 2023
Priority date	Jan 21, 2022
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

The invention discloses high-strength glass-ceramic-based lightweight aggregates and the preparation method thereof. The mass ratio of raw material components is 50-70 parts of engineering muck, 20-40 parts of glass, 3-7 parts of calcium carbonate, 3-7 parts of magnesium oxide, and 2-10 parts of a nucleating agent; the nucleating agent is at least one of calcium fluoride, titanium dioxide, and chromium oxide. After crushing, mixing, and granulating, spherical particles with a particle size of 10-12 mm are formed; and then the product can be obtained after drying, sintering, and cooling. The obtained lightweight aggregate from the invention has a diopside matrix which provides high strength and a low water absorption rate at low densities. Moreover, waste glass and engineering muck could be utilized with high value.

First claim

What is claimed is:

1. High-strength glass-ceramic-based lightweight aggregates, containing the following components in parts by mass:
50-70 parts of engineering muck, 20-40 parts of waste glass, 3-7 parts of calcium carbonate, 3-7 parts of magnesium oxide, and 2-10 parts of a nucleating agent; the nucleating agent is at least one of calcium fluoride, titanium dioxide, and chromium oxide;
the sintering steps of the high-strength glass-ceramic-based lightweight aggregates are as follows:
a first heating stage that raises the temperature from room temperature to 800° C. at a heating rate of 5-10° C./min;
a nucleation phase that is maintained at 800° C. for 30-60 min;
a second heating stage that raises the temperature from 800° C. to 1100-1180° C. at a heating rate of 10° C./min;
a sintering phase that maintains at 1120-1180° C. for 1 h and then cools down to room temperature.

2. The high-strength glass-ceramic-based lightweight aggregates according to claim 1 , containing the following components in parts by mass: 50-70 parts of engineering muck, 20-40 parts of waste glass, 5 parts of calcium carbonate, 5 parts of magnesium oxide and 2-10 parts of a nucleating agent; the nucleating agent is at least one of calcium fluoride, titanium dioxide, and chromium oxide.

3. The high-strength glass-ceramic-based lightweight aggregates according to claim 2 , wherein the engineering muck is brown muck produced in underground engineering development, which is crushed before use and then dried at 105° C. for 48 h.

4. The high-strength glass-ceramic-based lightweight aggregates according to claim 2 , wherein the calcium carbonate and magnesium oxide are analytically pure; the waste glass is waste colorless transparent flat glass.

5. The high-strength glass-ceramic-based lightweight aggregates according to claim 1 are used to prepare building materials.

Assignees

• Univ Wuhan Tech

Inventors

• Liu Yunpeng
• Wan Wenhao
• Wang Fazhou
• Hu Shuguang

Classifications

• C04B33/132 Primary

  Waste materials; Refuse {; Residues} (C04B33/16 takes precedence) · CPC title

• C04B14/22

  Glass {; Devitrified glass} · CPC title

• C04B18/023

  Fired or melted materials · CPC title

• C04B18/027

  Lightweight materials · CPC title

• C04B33/13

  Compounding ingredients (C04B33/36, C04B35/71 take precedence {; pigments for ceramics C09C1/0009}) · CPC title