Prevention and control methods of black spots on activated alumina

If we do not pay attention to the details during the production process of activated alumina catalysts, there may be black spots that not only affect the appearance of the product, but also seriously affect sales. In order to prevent this phenomenon from happening, we need to know how black spots occur and what prevention measures are in place.

Reason: There are many production processes, complex production equipment, and simple corrosion and rusting of iron equipment. After some black spots occur, they are packaged and stored together with the activated alumina catalyst. Another contributing factor is the raw material bauxite, which contains not only high levels of aluminum oxide, but also trace elements such as iron oxide, silicon oxide, and potassium oxide. During the differentiation process of aluminum ore, various trace elements are mixed and crystallized to form hard small black spots. The larger shaped black spots are filtered out, and the smaller ones are packaged and stored with the product.

Prevention and control measures:

1. Increase the iron removal process in production to remove the remaining iron oxide and reduce the probability of black spots appearing.

2. Adding a certain amount of potassium permanganate solution during the differentiation process of aluminum ore can effectively suppress the growth of black dot crystals and control them within a small range.

3. Use a small mesh to filter out larger black spots.

The occurrence of black spots on activated alumina catalysts is closely related to the corrosion of equipment in the production process, rather than changes in product quality, which will not affect normal use. However, considering the impact on aesthetics, it is still necessary to find ways to prevent them.

Yangzhou Zhongtianli New Materials has focused on the research of industrial raw materials such as high-purity metal arsenic, aluminum isopropoxide, pseudo boehmite, activated alumina, high-purity alumina, micro nano Rice noodles and other industrial raw materials for many years, and has provided raw materials for ED, sapphire, lithium battery ceramic diaphragm manufacturers, pharmaceutical and chemical production enterprises. If you want to know more about activated alumina, please contact us.