The analysis of brown aluminum oxide raw materials can be started from the following three aspects
The brown color of brown aluminum oxide is related to smelting. It is a brown artificial corundum made by melting and reducing three raw materials, bauxite, coke (or anthracite), and iron scraps in an electric furnace above 2000 degrees. It is named after this. Its main chemical component is aluminum oxide. The content varies greatly, some contain more than 90%, and some contain more than 70%. In addition, it also contains a small amount of Fe, Si, Ti, etc. Since it is calcined and smelted at high temperature, it is brown in color.
Through the above description, we understand some of the production processes of brown aluminum oxide, that is, redox reaction is carried out at high temperature to remove impurities, thereby forming alpha aluminum oxide, and then obtaining corundum blocks that meet quality requirements. Among them, silicon oxide and the like are the main impurity components in the product, and the amount of titanium oxide content will not only affect the quality, but also make the color of brown aluminum oxide reddish.
In addition, the color of brown aluminum oxide is related to its component content. The product contains 1% to 4% titanium oxide. The titanium element will affect the color of the product. If the content is too low, the product will appear grayish white. If we look at it from the perspective of existing products on the market, some brown aluminum oxide that is smelted slightly worse will appear rose red in the finished product. The quality of products with this color is average. Another situation is that some merchants put some reddish garnet abrasives into the products.
