COE
74 posts
TimePosted 04/07/2013 05:16:46
COE says

cement blaine and residue on 45 micron control?

Dear expert 

 

can you please share your opinion about the what are the main levers to control the blaine and residue on 45 micron in cement product indivisually.

take any case -1  , our blaine is 3400 cm2/gm and residue on 45 micron is 13% and if we want to reduce the residue by 3% with out affecting the blaine, how it is posible? (or vise versa).

 

thanks

regards

raju verma

 

 

 

 

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Ted Krapkat
476 posts
TimePosted 04/07/2013 06:48:44

re cement blaine and residue on 45 micron control?

Hello Raju,

Since both are a measure of particle size, residue is normally linked to Blaine. But not always. 

It depends on the particle size distribution of the cement and this is driven by several things including mill design, ball charge (or grinding pressure in a roller mill), clinker hardness,  gypsum content, and the quantity and hardness of mineral fillers used (eg limestone).

Since these things are generally fixed for a particular milling system, it is difficult to change the residue independently of the surface area. Sometimes worn separator seals or vanes can increase residue while leaving the surface area unaffected. You should check for wear or gaps in the seal and vanes to eliminate oversize particles bypassing the separator.

Many plants these days have abandoned surface area in favour of residue. This is mainly because of the increased use of limestone as a mineral filler. Limestone is much softer than clinker and concentrates in the fine fractions. It therefore contributes strongly to the surface area, yet it has little strength value. In this case it is far better to rely on the residue because it mostly measures the unground clinker which is harder yet contributes far more to the cement strength.

You may be able to influence the relationship between residue and surface area by adjusting mill  parameters such as separator speed and mill feed rate, but it will be difficult.

See this discussion on LinkedIn;-   http://www.linkedin.com/groups/Dear-all-experts-is-it-2302829.S.217754720

 

Regards,

Ted. 

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