Additive for preventing and eliminating skinning, heading and ringing in rotary kiln

Abstract

The invention provides an additive for preventing and eliminating skinning, heading and ringing in a rotary kiln. The additive is prepared from the following raw materials in parts by weight: 15-35 parts of dolomite, 5-15 parts of olivine, 10-20 parts of steel slag, 5-10 parts of a slag melting agent, 10-20 parts of bauxite, and 5-10 parts of sanbornite. The dolomite and the olivine can bring in a large amount of MgO, and the steel slag, the slag melting agent, the bauxite and the sanbornite are non-seed crystals, so that the calcination of a clinker is promoted to a certain extent. The main ingredients of the non-seed crystals including the steel slag, the slag melting agent, the bauxite and the sanbornite are CaO, Al2O3, SiO2 and the like; the mineral composition mainly exists in the form of C2S, and crystals of the mineral composition have been formed, grow well, have relatively high chemical potentials and activities, and can give full play to an induction crystallization effect equivalent to that of a high-quality clinker in a clinker calcination process. The steel slag and the sanbornite can release potential heat energy under high-temperature calcination, thereby reducing a generation temperature of a liquid phase.

Description

technical field [0001] The invention relates to an additive, in particular to an additive for preventing and eliminating skinning, balling and ringing in a rotary kiln. Background technique [0002] At present, during the operation of cement rotary kilns, various types of cement rotary kilns encounter problems such as skinning, balling, and ringing almost every day. There are many factors that form crusting, balling, and ringing in the rotary kiln, but the liquid phase The production and solidification are the main processes of their formation. Lining material temperature, material temperature, coal ash and raw material composition are important factors that determine the formation and solidification of liquid phase. During the clinker calcination process, the raw material appears liquid phase at about 1200°C, and the viscosity of the liquid phase begins to decrease at about 1250°C, and the amount of the liquid phase increases. It solidifies on the kiln wall and forms a cr...

AI Technical Summary

Problems solved by technology

For large balls and formed thick rings, the kiln must be stopped and the operator enters the kiln for treatment after the temperature is lowered to normal temperature. This will not only destroy the normal thermal system in the rotary kiln, but also damage the health of the operators. At the same time, it will cause huge economic losses to the enterprise!