In the 20th century, 60 years, the wet process of cement production accounted for the main status ,the 20th century, 30 to 60 years, the international development of the Li Boer kiln, the early 1950s, Germany successfully developed preheat kiln. Suspension preheating kiln so that the original state of the kiln in the accumulation of material preheating and part of the carbonate decomposition process, moved to the suspended preheater suspended state, was suspended in the state of raw meal and hot air full contact, Heat transfer speed, improve the production capacity of the kiln, reducing the kiln firing energy consumption. 70 years, the international emergence of the kiln outside the decomposition of new technology, it is in the suspension preheater kiln on the addition of a decomposition furnace, so that the fuel combustion process and the exothermic decomposition of carbonates in the decomposition process furnace suspended State, so that the decomposition rate of raw meal carbonate from the suspension preheater kiln about 30% to 90%.

The new dry-process cement rotary kiln production is based on the suspension preheating and pre-decomposition technology as the core, the latest achievements of modern science and technology and industrial production are widely used in cement production process summary, so that cement production with high efficiency, high quality, Clean production and other advantages, in line with environmental protection requirements and large-scale, automated, scientific management characteristics of the modern cement production mode.

Calcination of cement clinker is to the appropriate ingredients of raw materials in the kiln by high-temperature calcination to partial dissolution, to be calcium silicate as the main component of the Portland cement clinker process. During the calcination process, raw materials undergo a series of physical and chemical changes, such as drying, dehydration, carbonate decomposition, solid reaction, calcination and cooling, and finally forming clinker. Carbonate cement clinker mainly consists of tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminate and other minerals.

In the process of calcination, the factors such as temperature, liquid amount, raw material fineness and uniformity, material suspension degree, kiln ventilation, raw material composition and mineralizer have great influence on the yield and quality of clinker. ; The clinker extremely cold is an important way to improve the quality of clinker, should take effective measures to improve the cooling rate of clinker; through the use of advanced production methods, make full use of waste heat from the kiln exhaust gas, reduce incomplete combustion of the fuel, The actual consumption of material burning to improve the thermal efficiency of calcination, reducing the burning process of fuel consumption, protection of resources.