Non-sintered high-strength lightweight aggregate one-shot prepared from sulfur-based and alkaline-based solid wastes by stirring, granulation, foaming, preparation method therefor and use thereof

A non-sintered high-strength lightweight aggregate prepared from sulfur-based and alkaline-based solid wastes by stirring, granulation, and foaming, comprising a sulfur-based solid waste, an alkaline-based solid waste, an auxiliary cementing material, a ferro-aluminum-sulfur cementing material, water, and a foaming agent, wherein

• based on the mass of the total solid, the total content of the sulfur-based solid waste, the alkaline-based solid waste, and the auxiliary cementing material in percentage by mass is 80%-90%, and the content of the ferro-aluminum-sulfur cementing material in percentage by mass is 10%-20%;
• the mass ratio of the water to the total solid is (15-20):(80-85);
• the foaming agent accounts for 0.3%-0.7% of the mass of the total solid;
• the mass ratio between the sulfur-based solid waste, the alkaline-based solid waste, and the auxiliary cementing material is (27-33):(27-33):(18-25);
• and
• a method for preparing the non-sintered high-strength lightweight aggregate prepared from sulfur-based and alkaline-based solid wastes by stirring, granulation, and foaming comprises:
• step one:
• first stirring and uniformly mixing the sulfur-based solid waste, the alkaline-based solid waste, the auxiliary cementing material, and the ferro-aluminum-sulfur cementing material, adding the foaming agent and the water, and second stirring and granulating the mixture to obtain lightweight aggregate spheres, wherein the sulfur-based solid waste, the alkaline-based solid waste, the auxiliary cementing material, and the ferro-aluminum-sulfur cementing material are mixed in a stirring granulator;
• the first stirring is high-speed stirring performed at 50 Hz for 1-5 min;
• and the second stirring is medium-speed stirring performed at 25 Hz for 5-25 min;
• and
• step two:
• curing the lightweight aggregate spheres and screening the cured lightweight aggregate spheres to obtain the non-sintered high-strength lightweight aggregate,
• wherein the non-sintered high-strength lightweight aggregate has a 28 d cylindrical compress strength of higher than or equal to 10 MPa and a bulk density of less than 1,000 kg/m3.