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Dongyue Autoclaved Aerated Concrete Line (AAC) For this highly sophisticated manufacturing process, Dongyue has all the components and technology available. The manufacture of aerated concrete places great demands on the dosing of raw materials, the supervision of the fermentation process and the control of the following production steps. Many years of experience and the deployment of the latest automatic control algorithms in our control components guarantee the quality of the fnished products The basis for continuous high quality Aerated concrete is produced from quartz sand, lime, cement, gypsum (anhydrous), and water. The process starts with quartz sand being milled in a wet ball mill into a fine sand slurry which is then stored in slurry silos with an integrated stirrer. It is important to keep the defined density, which is controlled either manually or automatically. Sand slurry, recycled slurry, lime, cement, gypsum, aluminum and water are added to the mixer according to the desired product recipe. Immediately after the mixing the pre-positioned moulds are filled and subsequently transported to the fermentation area. Here the mixture starts reacting by producing fine pores, allowing the mass to harden into an aerated concrete cake. Consistent precision The fermentation process produces hydrogen, resulting in the creation of billions of tiny pores in the concrete cake. At the end of the process the cake is left with an enormous number of air cells. Simultaneously the aerated concrete cake starts to harden. As soon as the material has enough resistance to be cut, the aerated concrete cakes are demoulded and placed onto the cutting line. Here they are frst calibrated, profiled, and cut both horizontally and vertically. Quality products safely packaged The aerated concrete achieves its final strength from the curing under steam pressure in the autoclaves. The steam pressure chambers work fully automatically and are highly energy efficient due to an optimised process in control technology. The curing process follows exact definedprocedural steps. The curing time depends on the density and the grade of open pores of the cake. Finally, before leaving the plant, the finished products are packaged in a way that they are protected from dirt and humidity. Depending on the installation concept the packaging process can be either fully or semi automatic. General Procedure 1. Aggregate storing and measurement Sand Storing Sand preparation and transport Milling devices &Sand Slurry 2. Mixing and dispensing Aggregate dosing and mixing devices Moulds, hardening floors Process / installation controls 3. Cutting device Pre-cutting device Longitudinal-cut device Cross-cut device Grip pocket milling machine Cut waste recycling device Recycling of the cut waste 4. Mould transport Moving car Cubing device Roller conveyors Chain conveyors Cleaning device 5. Curing in autoclaves Autoclaves and accessories Automatic steam control Steam boiler with energy saving device Recirculating moisture 6. Packaging Cutting machine Cubing installation Packaging machine
