Smelting and purifying method of activated alumina

Activated alumina contains the elements aluminum and oxygen. If the bauxite raw material is chemically treated, the product obtained by removing the oxides of silicon, iron, titanium and the like is an alumina raw material with high purity. The following editor will introduce the smelting and purification of activated alumina:

1. The main raw material is industrial aluminum hydroxide, and its melting point increases with the increase of industrial aluminum hydroxide content, generally between 1700 and 1900 °C, while the melting point of the product is 2050 °C. In the smelting process, not only the charge must be melted, so the electric furnace melting The temperature of the liquid must be kept above 2050°C.

2. During the smelting and purification process, the smelting process of aluminum hydroxide in the electric furnace is carried out locally to a large extent. The electrical energy delivered to the furnace is basically distributed in two ways:

(1) High temperature arc heat, mainly used to melt the charge.

(2) The resistance heat of the melt mainly increases the temperature of the melt and makes the chemical reaction proceed smoothly.

3. In the smelting process, the charge is roughly divided into three layers: the upper and upper layers are the roasting layer, the middle is the sintering layer, and the lower is the melting layer, and these three layers are not completely separated. The reason for adjusting the charge.