Grinding Aids for Ball Mills

A ball mill generally loses its grinding efficiency remarkably at fine grinding. This is because fine particles from ground materials agglomerate and adhere to the mill liners or grinding media as coating, reducing the impulsive force of the mill. In addition, the agglomerated particles are mixed into the coarse powder in the separator and recirculated through the mill. A grinding aid prevents this agglomeration to improves the grinding efficiency. The aid is generally added to the clinker at a fixed rate from 0.01% to 0.03% before entering to a finishing mill. As a result the grinding improves by 4% to 6% per 0.01% addition of aid. The aid also improved the dispersibility and fluidability of cement (powder) and weathering is delayed

There are various substances that can be used as a grinding aid, and the selection process has to give consideration to the overall cost and potential impacts on product quality. Diethylene glycol is most widely used in Japan, as it offers good economy and doesn't have an adverse impact on product quality.

Development Status Products
Commercial
Cement

Grinding Aids for Ball MillsCosts & Benefits

Parent Process: Finish Grinding
Energy Savings Potential

Not available

CO2 Emission Reduction Potential
Costs

The cost of diethylene glycol is reported to be between US $1,360 to 1,820 per m3. [1US$=¥110]

Grinding Aids for Ball Mills Publications

Energy Efficiency and Resource Saving Technologies in Cement Industry

 

This Cement technologies booklet was compiled by the APP Cement Task Force (CTF) through one of its activities to help its member countries share information on all available energy efficient technologies generally used in the world’s cement industry. The document offers a comprehensive compilation of commercially-available energy efficient technologies used in the cement industry.