Breakage And Prehomogenization

Breakage: In the cement production process, the majority of raw materials should be broken, such as limestone and clay, iron ore and coal etc. The limestone is the maximum dosage of raw material, and particle size is larger after mining, and hardness is higher, so the broken of limestone occupies rather important position in cement plant material broken.

Prehomogenization: Prehomogenization technology is in the process of saving and taking materials, applying scientific material piling and taking technology to realize the raw materials' preliminary homogenization. It makes materials stockyard have storage and homogenization function at the same time.

Raw Material Preparation

In the cement production process, producing a ton of Portland cement need grind at least three tons of material (Including all kinds of raw materials, fuel, clinker, mixture, gypsum, etc). According to statistics, the power consumed for grinding work of dry cement production line accounts for above 60% of the power used by whole plant,raw material grinding accounts for more than 30%, coal grinding accounts for about 3% and cement grinding accounts for about 40%. Therefore, choosing grinding equipment and process flow reasonably, optimizing process parameters, correct operation and controlling operations system has great significance for ensuring product quality and reducing energy consumption.

Raw Material Prehomogenization

In the new dry cement production process, making the raw ingredients enter cellar stable is the premise of stable clinker burning into pyrology system. Raw material homogenization system plays a final checks role for stable raw ingredients entry.

Preheating And Decomposition

Instead of part function of rotary kiln ,the raw material preheating and parts of decomposition is completed by preheater to shorten the length of kiln. At the same time, it makes gas materials heat exchange process in accumulation state in the stove move to preheater in inner state of suspension to make raw maretial with exhaust hot gas fully mixing. This increases the contact area between gas and raw material, heat transfer speed gets fast, heat exchange efficiency is high, can realize the purposes of improving production efficiency and reducing the heat consumption.

Pyroprocessing

When it finishs the preheating and decomposition of the raw material, next procedure is putting raw material into rotary kiln to burn into clinker.

The carbonate further quickly decomposes and in a series of solid phase reaction in rotary kiln, and it generatings minerals of cement clinker. With material temperature rise, the minerals will become liquid and generate large amount clinker. After clinker is burned, the temperature begin to reduce. Finally the cement clinker cooling machine cools the clinker discharged by rotary kiln to the temperature which downstream cooling conveying, stores and cement mill can bear. At the same time it recovers the sensible heat of clinker, and improves the thermal efficiency of system and clinker quality.

Cement Grinding

Cement grinding is the last process of cement manufacture, and it is the process that consumes most electric. Its main function is grinding cement clinker (and gelling agent, performance adjusting materials, etc) to the appropriate granularity, form certain particle gradation, and increase its hydration area, accelerate hydration speed, to satisfy the slurry condensation and hardening requirements.

Packing And Distribution

The cement can be distributed in package and bulk. Now national standard requests that bulk must achieve 70% above, so it is a big trend to develope bulk cement in domestic.

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rotary kiln: http://www.hxjqchina.com/product-list_38.html