• Horizontal grinding track 
• Conical roller, 15^o inclination to the horizontal 
• Grinding rollers guided in standard rocker arms located outside the grinding house 
• Modular mill design, 2, 3 and 4 roller mill on increased grinding table with the same module 
• Hot gas duct and grinding force transmitting parts of the mill are individual structures, not linked to each other 
• Hydro-pneumatic spring system 
• No metal to metal contact during all operation phases of the mill via stop buffer or sensors 
• Mill and classifier integrated in one unit and designed according to NFPA 3.5 bar abs 

• Standard motor for the mill drive, grinding rollers is lifted during start up of the mill, so no auxiliary device is required 
• Grinding and drying of raw material up to 25% surface moisture 
• Three processes in one unit: drying, grinding, classifying 
• Capacity range: 0.6 - 750 tph 
• Low specific power consumption of the mill 
• Low noise and vibration level, simple plant arrangement, outdoor installation is possible 
• Simple plant layout, minimized space requirements, savings in building costs 
• High availability of the Loesche mill through modular design and operation of proven mill parts 

• Low energy consumption compared to tube mill grinding system. Saving in cost and positive aspects for the environment are given. 
• Low civil cost because of space saving design. 
• Capacity range 38-200 tph; grinding to surface areas > 4.500 cm²/g 
• Effective drying process during the grinding makes the Loesche mill excellently suited for grinding of blast furnace slag or producing blended cement from one or more wet components. 
• Very smooth operation by the 2+2 system. 
• No metal to metal contact between grinding elements via stop buffer. 
• Simple adjustable fineness and grain size distribution of the required product quality. 
• High reliability by using modular elements of proven design. Long service life by special developed grinding elements at low costs. Wear protection for all exposed surfaces.

Regarding conventional grinding plants with tube mills, 30% savings in energy requirements or better are possible with the Loesche 2+2 Mill.    

So the Loesche 2+2 Mill will increase profitability and contribute competitiveness.   

Three processes are combined in the 2+2 Mill:    

• Drying 
• Grinding and disagglomeration 
• classification 

Operations    
By means of the hydropneumatical spring system the 2+2 Mill is started with lifted grinding rollers.    
Therefore, an auxiliary drive is unnecessary. The simple plant control system controls the machinery equipment and the operation.  
 

• combustion chamber made of heat resistant steels i.e. no refractory lining
• easily controlled and adjusted to changing loads
• goof thermal economy
• low weight, i.e. no heavy foundations

Fuels 

• gas
• light oil
• heavy oil
• low calorific gases (Hu > 2.500 kJ/m³)

• ambient air
• cleaned exhaust gases

The high inlet velocity of the mixing air cools the protective jacket and keeps the flame away from the perforated jacket.

In the technologies applied so far, refractory lined combustion chambers are used. Additional supporting burners are required in that respect. 

These combustion systems are charatized by the high quantity of retained heat and necessitate long heating-up and shutting down periods. In the event of emergency situations, a costly emergency stack is essential for venting off the stored heat. Danger to the down-stream units can be prevented in this way. 

A special technique developed to combine that advantages of a multiple lance burner, with a combustion chamber. This combustion chamber has no refractory lining and is referred to as a perforated jacket (LOMA) heater. 

The technique is distinguished by the following features: 

• minimum stored heat
• no preheating period
• wide control range
• plant can be immediately started and shut down
• no emergency stack is required

Such as hot gas generators are used for, e.g. burning blast furnace gas in steel works and for applications in dry grinding plants.