panaromic pic of messebo
Quarry and Crusher

The EV hammer impact crusher reduces quarry size limestone boulders to mill feed in only one reduction, giving a reduction ratio of 1:100. The hammer rows are fitted in a staggered arrangement to give complete coverage across the outlet grate. The hammer assembly provides several points of attack on the raw materials, increasing the overall efficiency of the crusher.

The crushed product has a relatively high proportion of fines and more of the comminution work is therefore moved from the less energy efficient raw mill to the more energy efficient crusher.

  • Key advantages
  • Single stage crushing
  • Reduction ratio up to 1:100
  • Excellent control of finished product
  • Capacity up to 450 tph

 

 

Raw mill  

The raw material grinding system is equipped with a ball mill (diameter = 5m, drying chamber length=2.2 and grinding chamber length=8.22m). The nominal capacity of the mill is 180t/h, the fineness of the product is 15% residual on 90μm sieve and moisture content in the raw meal is less than 1%. In Messebo cement factory the exhaust gas from pre-heater is used to dry the raw materials from average moisture content of 4% to less than 1% in the raw meal. As mentioned above there are four feeding bins in raw material proportioning station (limestone bin, Shale bin, sand stone bin and iron ore bin). The four kinds of raw materials are fed to a common belt conveyor according to the pre-set proptioning ratios by corresponding weighing feeder (dosimat feeder). Then the raw material on the conveyor is fed to the ball mill. In the raw mill drying and grinding take place and the very fine materials will go with the air as separation air and the Coarse ones go to the air slide at the outlet of the mill then to bucket elevator and then finally to the separator through an air slide. The ground material is then classified by a sepax separator.

Kiln  
The kiln is three-pier rotary kiln system with nominal production capacity of 2000 tpd. It operates with minimal heat consumption and space requirements. The kiln has 3.75 m diameter and 57 m length with a downward slope of 4 degrees.



Cement mill and Packing  
closed circuit grinding system is applied. The main equipment consists of a 4.6x12m double compartment tube mill and a sepax separator. This mill at this time produces two types of cement namely Ordinary Portland Cement (OPC) and Pozzolana Portland Cement (PPC). OPC comprises 90%clinker, 5%additive (limestone) and 5 %( gypsum). PPC comprises 70% of clinker, 25-29%% pozzolana and 5%gypsum. The design capacity of the mill is 120t/h for OPC cement. But currently it is working upto 120-135t/h for OPC and 135- 150 t/h on PPC.

Packing  
The vibrating screen is designed to act as a filter in order to avoid the introduction of lumps in the productive cycle. It is connected, by means of bellow elastic chute, to the feed hopper. The feeder hopper consents to dose the product and to guarantee its constant presence, when it is requested. The actual dosing is performed by a butter fly valve and by an appropriate vane feeder whose capacity is checked. The heart of the packing line is the bag packer and is equipped with a storage hopper connected to different cones depending on the number of spouts the packer is equipped with(8 spouts in our case).