Cement rotary kiln，as a main equipment of cement clinker dry process and wet process production line, has unique features. Temperature is high, and the flame temperature is at 1700-1900 ℃. Large precalcining kiln can be as high as 2100 ℃, and the material temperature is 1450 ℃. Almost all of various compounds in the stove can be dismantled, non-volatile elements through solid or through liquid phase forms clinker mineral phase or into the clinker mineral crystal lattice, and small amounts of volatile elements is with the flue gas escaping to the kiln after cooling down in low temperature area, only a tiny part as the steam state or adhering to the fine dust on the net with flue gas discharges.

There is a strong oxidizing condition of cement kiln. Flue gas of rotary kiln with suspension preheater has a high concentration of dust, and wet kilns with a long chain belt, which are conducive to absorb the emissions of acid gases, reduce certain volatility of these elements and improving the condensation temperature, the absorption of trace elements. Cement rotary kiln has a set of efficient dust removal system or high temperature exhaust gas recycling of grinding, drying system, very conducive to recovery of trace elements in high volatile, so only to find out under specific conditions of the cement kiln, volatile features of some related elements. It has practical significance to evaluate the emission in cement kiln of trace elements and the ability to make use of waste. A kind of method of evaluating the volatility of trace elements in cement kiln system is clinker absorption degree, related elements content in the clinker and the original fuel ratio.