Aerated concrete products have been developed abroad for nearly a hundred years and have become a pillar industry in the construction industry. my country has introduced this technology for nearly 40 years, and its production technology and equipment tend to mature. Because aerated concrete has the advantages of light bulk density, high thermal insulation performance, good sound absorption effect, certain strength and processability, and rich production raw materials, especially the use of fly ash as raw material, it can comprehensively utilize industrial waste residues and control environmental pollution. , does not destroy cultivated land, and can create good social and economic benefits. It is a wall material that replaces traditional solid clay bricks. It has been strongly supported by national wall reform policies, tax policies and environmental protection policies over the years. Concrete products have become an important part of new building materials and have broad market development prospects.

2. Aerated concrete production process

Aerated concrete can be produced using different processes based on the type, quality, and process characteristics of the main equipment, etc. of raw materials. But in general, fly ash or silica sand is ground into a slurry with water, powdered lime, an appropriate amount of cement, gypsum and foaming agent are added, and then injected into the mold frame after stirring. After static oxygen foaming and solidification, it is cut into various shapes. Specification blocks or plates are sent into the autoclave by a steam-curing truck, and are cured with high-temperature saturated steam to form porous, lightweight aerated concrete products.

Firstly, the stored raw materials are metered and batched (1) and then put into the pouring mixer. After stirring (2), the pouring temperature and time are pre-cured (4) After the green body reaches a certain hardness, it is turned over. The spreader lifts the mold and blank to the cutting machine. The flip spreader completes the following functions: a. Turn the mold 90 degrees in the air (5) (one side plate of the mold becomes the bottom plate to support the body until the finished product is steam-cured), b. Lift the carrying trolley or cutting support frame to complete the mold opening , demoulding (6), c. The removed mold frame and the returned steam-cured side plate (16) are reassembled into the mold (17) and wait for cleaning and then injection of oil (18) for re-pouring. The green body is cut on six sides step by step on the cutting machine; a. First, vertical cutting is performed on both sides of the green body (7), b. Then, longitudinal and horizontal cutting is performed (8); c. Finally, transverse horizontal cutting is performed (9). The cut green body is lifted to the steam curing trolley (10) by the semi-finished product spreader together with the bottom plate, and then put into the autoclave (11) for high-temperature steam curing (12). After steam curing, it is taken out of the kettle (13) and is lifted from the finished product. The tools stack the finished products (14) or load and pack them (15), and the steam-cured side panels return (16).

3. Production equipment and equipment

The selection and quantity of aerated concrete production equipment are determined according to the process design plan. According to the process design, pouring is divided into fixed and mobile types. Pouring and cutting methods are currently dominated by flip cutting in China, and other batching systems, autoclaved curing and other equipment are similar.