The difference between white fused alumina and brown corundum smelting: white corundum is produced by dumping method, and the lining construction material is usually white corundum sand or aluminum oxide powder. The receiving bag includes an unlined receiving bag and a lined receiving bag. Unlined seam bags shall be forced water cooled. Usually, graphite or white corundum refractory products are used as lining.
For the production of white corundum by frit method, the lining needs good heat insulation and air permeability. The furnace body is divided into lining type and unlined type. For consolidated brown corundum abrasive grinding, black aluminum oxide abrasive is consolidated by binder to make abrasive tools. When the tool is placed on the abrasive tool, due to the role of binder, not only the large-size.
Brown alumina abrasive can contact with the surface of the workpiece, but also many small-size. Brown alumina abrasive can contact with the surface of the workpiece, so that the number of white aluminum oxide abrasive in contact with the surface of the workpiece is large, and the number of brown alumina abrasive involved in the grinding process is large, and the pressure of each Brown alumina abrasive is small It has the advantages of small strength, shallow grinding depth, small distance between brown corundum abrasives, small machined surface roughness value and high machined surface quality.
White corundum has the characteristics of large volume density, low porosity, good volume stability and thermal shock resistance. It is a high-grade refractory raw material with good effect. With the improvement of product quality, the application scope is still expanding. Characteristics of brown aluminium oxide: the product granularity is produced according to international standards and national standards, and can be processed according to the granularity required by users. The general particle size is from F4 to F320, and its chemical composition depends on the particle size.
Brown corundum, also known as carborundum, is a brown artificial corundum made of bauxite, carbon materials and iron scraps by melting and reducing in an electric arc furnace, so it is named for this. The main chemical composition of brown fused aluminum oxide is Al2O3, with the content of 95.00% – 97.00%. In addition, it contains a small amount of Fe, Si, Ti, etc. Brown corundum is the most basic abrasive, because of its good grinding performance, wide range of application, low price, is widely used.
The technological process of black corundum is as follows: corundum block – coarse crushing – medium crushing – crushing – segmented screening – magnetic separation – fine screening – Inspection – packaging white aluminium oxide is mainly used for free grinding, such as bottom polishing before electroplating of metal parts, aluminum products, polishing of bicycles, motorcycles, sewing machines, clock parts, lighting, plastics and hardware tools, sandblasting (rust removal, glass spray), processing materials, manufacturing resin cutting pieces, angle grinding pieces and coated abrasives.