Studies On Energy Saving Technology In Pidgeon Process

Magnesium has been widely used on various industry fields because of its specialfeatures. Magnesium output has been greatly promoted by Pidgeon process. Especiallyin21st, the world magnesium production capacity increasing rate was more than20%.China magnesium production accounts for80%of the world. By the end of2009, Chinamagnesium production was over500,000ton.Pidgeon process is one process with high energy consumption and seriousenvironment pollution. After a series of methods were applied, such as application ofrotary kiln and cellular regenerator, the energy consumption was declined to4SCE perton magnesium. But the theoretical energy consumption was only2SCE per tonmagnesium. So, the energy saving proficiency will be of great importance. Some studiesindicates that reduction time can be cut by using conductive strengthen device andelectric resistance heating inside the reduction jar. But these methods are limited by thecapacity of the jar, which will reduce the energy efficiency. So, these methods have notbeen applied on industry production.Based on heat balance of practical magnesium production by silicon thermalreduction, the utilization of energy in productive process of calcined-dolomite anddeoxidation under vacuum environment are analyzed, to estimate the energy efficiency.The heat-balance information have been got after the process have beeninvestigated, technological parameter, composition of material, surface temperature ofthe device have been involved.The practical energy consumption and theoretical energy consumption arecalculated to analyze the direction of energy-saving as well as emission reduction, theenergy reduction of exhaust gas; energy emission and the recycle of slag are involved.As a result, some measures are suggested. At last, feasibility and economy of the measures have been discussed.