Rotary Kiln Heat Treatment Applications

The size of the rotary kiln is one of the main signs of production capacity. In the rotary kiln technology, there are some important positions in the production of non-ferrous metals, this equipment is used for ore, concentrate, intermediate sintering, roasting and other heat treatment, with the vigorous development of China's nonferrous metallurgical industry, the need for more and more, more and more specifications.
Rotary kiln with alumina as raw materials to molten salt electrolysis production of aluminum, as well as electric furnace steel and some metallurgical and chemical production process, the need for anode paste, electrode paste, electrodes, anode plates and other carbon products. Carbon products in the production, such as petroleum coke, metallurgical coke, delayed coke, asphalt coke, anthracite, in the 1100-1300 ℃ and oxygen-free conditions for calcination to exclude moisture, volatile, so that the structure is more compact, increased thermal stability, oxidation resistance, mechanical strength, electrical conductivity and thermal conductivity. This process can be done in a rotary kiln. Due to the burning of the combustion, so that the exhaust gas temperature is very high, the general rotary kiln waste heat recovery with waste heat boiler.
The first step in aluminum smelting is the production of alumina. In the rotary kiln sintering process of alumina production process, first of all by the bauxite, lime, alkali and other raw materials prepared into raw materials sintering into clinker; sintering process is carried out in the rotary kiln, firing temperature of about 1300 ℃ ; The last step in the production of alumina is aluminum hydroxide roasting into alumina, is also generally used rotary kiln, calcination temperature 1200 ~ 1250 ℃.
Rotary kiln electrolytic aluminum process, but also the need for frozen crystal aluminum, fluoride and other fluoride salts for flux. Production of fluoride first sulfuric acid and fluorite as raw material to produce hydrogen fluoride, it is also in the rotary kiln - heat rotary kiln or external heat rotary kiln carried out. Drying kiln is also used to dry various fluorinated salt products and slag gypsum.