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As a general rule, there should be less than 25% of clinker that is below 1mm in size. Coarse clinker is more of an issue for ball mills. Some cement groups use a formula, such as Bond's, to calculate the maximum ball size required in a ball mill, based on the average size of the clinker feed.
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The audit of a closed circuit grinding system focuses onfeed material characteristics, grinding progress in the mill, mill ventilation, classification and controls. PEC Consulting Group LLC | 10123 Corporate Square Dr., St. Louis, MO 63132 | +1 314 878.0123 |
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1. Optimization of the Cement Ball Mill Operation. Optimization addresses the grinding process, maintenance and product quality. The objective is to achieve a more efficient operation and increase the production rate as well as improve the run factor.
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In this article the effect of grinding media size distribution and feed material particle size distribution (PSD) on the product fineness requirements were investigated. A model free approach called the Attainable Region method was then applied in order to optimize the product size fineness in terms of the feed size and ball mix.
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Optimization of Feed Rate in Cement Grinding Mill Using Electronic Ear based on CMAC-PID Algorithm. IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 03, 2015 | ISSN (online): 2321-0613.
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one issue from each section. Crushing: Wide variation in crushed material size. Mill Feeding: Periodic variation in composition and size of material. Grinding in Ball Mill: First chamber loading and consequently jamming. Blending Silo: Mill variation affecting kiln stability quickly. Coal Mill: Mill Bag filter jamming.
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Raw Meal max R1% > 30 mm (Lafarge). Holcim "<25 – 50mm". For quartz, feed must be precrushed to <10mm. Note that 90mm are required to crush quartz fed at <3mm. Quartz demands a high crushing energy AND a high grinding energy. Coarse and Fine Clinker. It is "accepted" that coarse clinker is in many cases easier to grind than fine clinker.
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Feed size can be as large as 75 to 100 mm. Feed size can be as large as 5% of roller diameter. Roller Press. Roller press consists of two rollers lined with wear resistant material. One roller is fixed and the other one is movable to exert pressure, applied hydraulically. A roller press looks similar to a roll crusher.
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the feed, t the grinding time (with ball mills approximately proportional to the distance from the feed end), c a constant connected mainly with the sieve mesh but with properties of the feed and that of grinding equipment too. Formula (4.3) is a mathematical consequence of the simultaneous validity of R% :. 10 20 o 60 o 90 95 97 58
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Rawmill systems typically require a feed of maximum size 5-10 cm, so a crushing stage is first required. In the kiln, the finely-divided rawmix is sintered, resulting in production of hard clinker of typical size 1-50 mm. In order to produce cement, this has to be ground, again to a powder of maximum size about 100 μm.
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