What causes black spots in white corundum?
As the name suggests, white corundum is white, but it is not difficult to find that sometimes white corundum is mixed with black particles. Many customers wonder what this is?
1. Black impurities, if the impurities they carry are not removed completely or are intentionally mixed, they may cause black spots to appear in white corundum; rust and iron oxide are present in the white corundum raw material itself, which may not be removed completely during production. Inadvertent mixing of rust due to mechanical rust during the process can also cause the color of white corundum to be impure.
2. Insufficient smelting time can also be considered as the immature smelting process, which results in the low purity of white corundum itself, high impurity content, and small black spots in the color.
The pure and impure color of white corundum is one of the testing criteria for the quality of white corundum. If the quality of white corundum is not up to standard, it will also have a great impact on the performance of white corundum, such as hardness, grinding force, etc. will be affected. This requires manufacturers to have strict requirements for themselves.