Advantage of alumina slag being used in high performance concrete and its grinding mill selection

    Concrete industry was been put forward higher requirements under the booming economic development situation, high-performance concrete has become a development trend of the industry, which requires the production of concrete with adding an appropriate amount of non-metallic mineral powder as admixture, such as blast furnace slag powder, alumina slag, lithium slag. Adding of those fine powders can effectively improve the strength of concrete, improve the interface structure of concrete and improve the impermeability and durability of concrete, but also to turn alumina slag material as waste into treasure.

    Alumina slag is a waste of coarse particles caused during production of alunite. The powder after grinded by ultrafine mill has obvious advantage in the application of concrete industry.

    1. The early strength of concrete with addition of alumina powder slag is stronger than plain concrete, and to be higher and better than the early strength of concrete with addition of fly ash;

    2. Concrete with alumina powder workability is good, non-stick, that is good fluidity, easy construction;

    3. alum powder can suppress or weaken the alkali aggregate reaction, is priority to produce chemical react with silica of alumina slag and cement alkali, the cement alkali concentration is drastically reduced, so that the aggregate activity dioxide unable or weaken to react chemically with silicon and cement alkali, therefore, to avoid or mitigate the concrete cracking, losses, extend the service life of concrete.

    4. In addition, the ultra-fine powder can improve the frost resistance of concrete to meet the needs of high-performance of concrete currently.

     In the ultrafine mill equipment field, Guilin Hongcheng learn advanced technology both domestic and abroad, develop a suitable non-metallic mineral ultra-fine processing for large-scale production of high fine stand type milling machine based on HLM vertical mill. Use dynamic and static combined classifier; product fineness can be adjust freely between 325 mesh-2500 mesh (5μm-40μm), the maximum capacity can reach up to 20t/h. It can be widely used in ultra-fine grinding process of limestone, calcite, marble, heavy calcium carbonate, kaolin, barite, bentonite, pyrophyllite and other non-metallic mineral products, is a suitable for alumina slag grinding, efficient and productive, environmentally friendly and energy saving ultra-fine powder processing equipment.

    Vertical mill technology and equipment is high-tech products in powder industry, in line with the national policy of energy saving and consumption reducing, can bring high-quality powder for the powder industry. Hong Cheng HLMX vertical mill consist of main frame, feeder, classifier, blower, plumbing fixtures, hopper, electric control system, collection system and other components. For the 20%-30% moisture content (such as calcium carbide slag, lignite, etc.) material to a moisture content of less than 1% (cement clinker, etc.) materials; from 2-5mm (such as raw shale brick grinding of new wall materials industry, sand making of construction industry, etc.) to 15um by 97% (such as paper, chemical industry, TSP, etc.); from abnormal hard grind (such as quartz sand, slag, slag, pyrophyllite, iron ore, etc.) to the grindability materials (such as gypsum, calcite, limestone, etc.), the ultra-fine milling machine can handle freely, therefore, is a wide range of product fineness can be adjusted and control, easy operation equipment.