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Cement grinding and limestone content

Cement grinding and limestone content

Answer:

Cement grinding is the cement manufacturing process, but also the most power consuming process. Its main function is to cement clinker (and retarder, performance adjustment material etc.) to the appropriate particle size (by grinding fineness, specific surface area, the formation of certain gradation representation), increase the water area, accelerate the hydration rate of cement paste, meet the requirements of condensation, hardening.
In accordance with the "GB175 - 2007" common portland cement standard, the total amount of admixture of PC is larger than 20% and less than or equal to 50%, we must control the amount of admixture according to the proportion, in addition, chemical index and the physical index must be qualified to do, if the amount of admixture caused by its index qualified, it is necessary to reduce the amount of admixture.
Under the premise of adding mineral powder, the content of limestone can be appropriately increased, and the ratio of acid mixture and basic mixture is adjusted. As raw materials, according to the content of calcium oxide in limestone is different, generally in 52% - 80%. As an admixture in cement products, the proportion is less than 1.5%.

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