Lightweight heat-insulating high-strength foam concrete as well as preparation method and application thereof

The invention belongs to the technical field of comprehensive utilization of phosphate tailing resources. The invention provides lightweight thermal-insulation high-strength foam concrete as well as a preparation method and application thereof. The lightweight thermal-insulation high-strength foam concrete is prepared from the following raw materials in parts by mass: 30-50 parts of phosphate tailings, 50-70 parts of steel slag, 0.5-1 part of a foam stabilizer, 3-5.1 parts of a foaming agent and 30-51 parts of water. The dry density of the lightweight thermal-insulation high-strength foam concrete provided by the invention is 0.6-0.9 g/cm < 3 >, the compressive strength is 12-15MPa, and the heat conductivity coefficient is 0.08-0.12 W/(m.K). After the methyl cellulose is dissolved, a layer of wet flexible elastic film is formed between solid-phase particles and gas-phase bubbles, so that the liquid film strength is increased, the foam loss phenomenon is reduced, a lubricating effect is also achieved in the mi