Production of Calcined Dolomite

Four qualities of calcined dolomite are produced — half-, light-, hard-, and dead-burned. 

Half-burned dolomite (CaCOa MgO) is produced in relatively small quantities in Germany by the controlled calcination of dolomite at 800 to 900 °C. Little appears to have been published about the process. A small scale process was developed pre-1940 using a rotary kiln in which steam was injected into the flame to moderate the temperatures and to reduce the CO2 partial pressure [16.6]. 

Light-burned dolomite (or dolime) is produced in either rotary or shaft kilns. The principles are similar to those of making high calcium quicklime. Heat usages are presumably somewhat lower, owing to the lower heat of calcination of dolomite and its lower dissociation temperature. 

Hard-burned dolomite is generally produced in mixed-feed shaft kilns, operating under reducing conditions. Hard-burned dolomite is generally produced in mixed-feed shaft kilns, operating under reducing conditions. 

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