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cement material temperature control in cement ball mills

cement milling - understanding cement

cement milling - understanding cement

Cement milling is usually carried out using ball mills with two or more separate chambers containing different sizes of grinding media (steel balls).Grinding clinker requires a lot of energy. How easy a particular clinker is to grind ("grindability") is not always easy to predict, but large clusters of belite due to coarse silica in the feed are difficult to grind. Rapid cooling of the clinker is thought to improve grindability due to the presence of microcracks in alite and to the finer crystal size of the flux phases.

Vertical roller mills (VRMs) are the main alternative means of grinding the clinker and are increasingly being used. For a quick introduction to VRMs see, for example, this advertisement on Youtube for an FL Smidth VRM.

Because the cement gets hot due to the heat generated by grinding, gypsum can be partly dehydrated, forming hemihydrate, or plaster of Paris - 2CaSO4.H2O. On further heating, hemihydrate dehydrates further to a form of calcium sulfate known as soluble anhydrite (~CaSO4). This is calcium sulfate with a trace of bound water in the crystal structure and it has a very approximately similar solubility in water at room temperature to hemihydrate, which in turn has a higher solubility than either gypsum or natural anhydrite.

The relative proportions and different solubilities of these various types of calcium sulfate, and of the different forms of clinker sulfate, are of importance in controlling the rate of C3A hydration and consequently of cement set retardation. Problems associated with setting and strength characteristics of concrete can often be traced to changes in the proportions of the different forms of calcium sulfate due to differences in temperatures during grinding. Variations in cooling rate of the clinker in the kiln and subsequent changes in the proportions or size of the C3A crystals may also have an effect on setting characteristics.

If the rate at which sulfate is supplied by the different sulfate salts exceeds the rate at which the clinker minerals, principally the aluminate phase, can react, the pore solution may become supersaturated with respect to gypsum. Crystals of gypsum form which cause the mix to stiffen in what is known as a false set.

Conversely, if the rate at which sulfate is supplied is insufficient to control aluminate reaction, the mix will stiffen due to the fomation of monosulfate crystals, or possibly of calcium aluminate hydrate; this is known as flash set.

For set regulation, the most important feature of aluminate is not necessarily the absolute amount present, but the amount of surface which is available to water for reaction. This will be governed by many factors, such as the surface area of the cement, the grinding characteristics of the different phases and also the size of the aluminate crystals. Over-large crystals can lead to erratic setting characteristics.

Articles like this one can provide a lot of useful material. However, reading an article or two is perhaps not the best way to get a clear picture of a complex process like cement production. To get a more complete and integrated understanding of how cement is made, do have a look at the Understanding Cement book or ebook. This easy-to-read and concise book also contains much more detail on concrete chemistry and deleterious processes in concrete compared with the website.

Almost everyone interested in cement is also concerned to at least some degree with concrete strength. This ebook describes ten cement-related characteristics of concrete that can potentially cause strengths to be lower than expected. Get the ebook FREE when you sign up to CEMBYTES, our Understanding Cement Newsletter - just click on the ebook image above.

control in cement production - sciencedirect

control in cement production - sciencedirect

The paper deals with control in the cement manufacturing. A short description of the technology is given first, then the control problems and applied strategies are discussed. After a short summary of the existing control systems technology the possible applications of advanced control algorithms are treated.

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