Dolomite calcination is a crucial process for magnesium smelting plant. The quality of calcined white determines the effect of granulation and reduction process. In the traditional process, dolomite calcination has always used rotary kiln calcination system. The rotary kiln of this system has a large aspect ratio, it is heavy and because the high temperature flue gas at the kiln tail is directly discharged into the atmosphere, the heat energy is not effectively recovered, the energy consumption is large, and the running cost is high.

From 2003 to 2005,Henan Zhengzhou Mining Machinery Co., Ltd. invested a large amount of funds in the development of the new energy-saving dolomite calcination system of "vertical preheater + rotary kiln + vertical cooler", so that the dolomite calcination system can be truly achieved. High efficiency, energy saving, environmentally friendly, safe and highly automated.

The new energy-saving dolomite calcination process is , the qualified dolomite feed from the large angle conveyor enters the top silo of the vertical preheater in the calcination system. The dolomite in the top silo evenly enters the interior of the vertical preheater. At this time, the high-temperature flue gas at kiln tail enters the preheater to exchange heat with the dolomite, and preheats the raw materials to above 800 °C. After preheating, the dolomite raw material falls into the chute and enters the rotary kiln and is calcined to active calcined white at a high temperature of 1250 ° C. The active calcined white temperature flowing out of the outlet of the magnesium rotary kiln is as high as about 900 ° C and enters the vertical cooler. The high-temperature active calcination is fully exchanged with the combustion-supporting cold air that is blown into the bottom of the vertical cooler, and the active calcination white is cooled to below 100 ° C, and the combustion-supporting air is preheated to above 600 ° C. The cooled active calcined white is discharged from the cooler and sent to the granulation system through apron conveyor.

The high-temperature flue gas produced by the magnesium rotary kiln combustion, after heat exchange with the dolomite in the preheater, the temperature drops below 220 ° C, and then enters the bag filter, which is discharged into the atmosphere by the high-temperature fan after dust removal, and the dust of the exhaust gas Concentration less than 30mg/m3

The new energy-saving dolomite calcination system reduces the fuel consumption index by 40% due to the heat recovery of waste gas. At the same time, the length-to-diameter ratio of the rotary kiln decreases, the investment cost is lower, the output increases by 30%, and the temperature of the kiln flue gas falls to the dust collector. It can withstand the temperature below, which is good for dust removal of the dust collector.

The new energy-saving dolomite calcination system produced by Henan Zhengzhou Mining Machinery Co., Ltd. has been widely used in the magnesium smelting industry. At present, the market share of metal magnesium plants has reached more than 85% in domestic and overseas, and has been highly recognized by customers. The system fully meets the requirements of energy saving, energy consumption and environmental protection, and is in line with the development trend of the magnesium industry.Welcome to contact us to get magnesium production line with pidgeon process