Purification of Activated Alumina
2024-07-10
Activated alumina contains elements aluminum and oxygen. If the alumina raw material is chemically treated to remove oxides such as silicon, iron, and titanium, the resulting product is highly pure alumina raw material. Below is an introduction to its smelting and purification:
1. The main raw material of activated alumina is industrial aluminum hydroxide, and its melting point increases with the increase of industrial aluminum hydroxide content, generally between 1700 and 1900 ℃, while the melting point of the product is 2050 ℃. During the smelting process, not only should the furnace charge be melted. Therefore, the temperature of the electric furnace melt must be maintained above 2050 ℃.
2. During the smelting and purification process of activated alumina, the melting process of aluminum hydroxide in the electric furnace is largely localized. The electrical energy transported to the furnace is basically distributed in two aspects: first, high-temperature arc heat, mainly used to melt furnace materials; The second is the resistance heat of the molten metal, which mainly increases the temperature of the molten metal to facilitate the smooth progress of chemical reactions.
3. During the smelting process of activated alumina, the furnace charge is roughly divided into three layers. The upper layer is a calcined layer, the middle layer is a sintered layer, and the lower layer is a molten layer, and the three material layers are not completely separated. This is also the reason why interval sampling and adjustment of furnace materials are necessary during the smelting process.
Heat resistance of activated alumina desiccant
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