Horomill

Stefan SeemannResearch Institute of the Cement Industry (Düsseldorf)Seminar Grasim, 28 February, 2007

Structure

• Why a new mill?

• Horomill principle and design

• Summary

Why a new mill?

HPGR and VRM

+ low energy consumption

+ technically established

- narrow particle size distribution

- problematic intake conditions(HPGR)

Horomill

+ low energy consumption

+ small angle of nip

+ multiple stress of the material

+ fast change of cement type

- vibration problems

- coarse material recirculation during start up

- roller sealing

- wearing problems

Comparison of roller mill types

Structure

• Why a new mill?

• Horomill principle and design

• Summary

Principle

Principle

Inlet

Outlet

Centrifugationzone

Extractionzone

Grindingzone

4-6 grindingactions

GrindingForce

GrindingForce

Material speed control systemScrapers

Scrapers

Machine

Machine

Machine

Sold machines

Horomill 3800 (1800-2000kW)

130 t/h for OPC with 3100 cm²/g

82 t/h for Slag cement with 3200 cm²/g

225 t/h for Raw meal

Horomill 2800; 3400; 3600 (1000-1800kW)

Nowadays available up to Horomill 4600

Roller shaft

Mill shell lining

Energy consumption

source: FCB

Flow sheet

Flash dryer

Horomill®

Main feed Constant reject flow

Finalproduct

Main control loop

Hot gases supply

TSV®

BypassBag filter

Fan

Bucket elevator

Summary

A new mill combines a few advantages of already existing mill types

Results show a good performance but the handling is difficult

39 existing mills with medium throughput

Summary

Thank you for your attention!

Any questions?