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Development and optimization of clinker cement

Date:2019-01-07 14:35     writer:admin     Views:

  A typical process of manufacture consists of three stages:

  l Grinding a mixture of limestone and clay or shale to make a fine "rawmix";

  l Heating the rawmix to sintering temperature (up to 1450 °C) in a cement kiln;

  l Grinding the resulting clinker to make cement.

  In the second stage, the rawmix is fed into the kiln and gradually heated by contact with the hot gases from combustion of the kiln fuel. Successive chemical reactions take place as the temperature of the rawmix rises:

  l 70 to 110 °C - Free water is evaporated.

  l 400 to 600 °C - clay-like minerals are decomposed into their constituent oxides; principally SiO2 and Al2O3. Dolomite (CaMg(CO3)2) decomposes to calcium carbonate (CaCO3), MgO and CO2.

  l 650 to 900 °C - calcium carbonate reacts with SiO2 to form belite (Ca2SiO4) (also known as C2S in the Cement Industry).

  l 900 to 1050 °C - the remaining calcium carbonate decomposes to calcium oxide (CaO) and CO2.

  l 1300 to 1450 °C - partial (20–30%) melting takes place, and belite reacts with calcium oxide to form alite (Ca3O·SiO4) (also known as C3S in the Cement Industry).

  Alite is the characteristic constituent of Portland cement. Typically, a peak temperature of 1400–1450 °C is required to complete the reaction. The partial melting causes the material to aggregate into lumps or nodules, typically of diameter 1–10 mm. This is called clinker. The hot clinker next falls into a cooler which recovers most of its heat, and cools the clinker to around 100 °C, at which temperature it can be conveniently conveyed to storage. The cement kiln system is designed to accomplish these processes .

  Lvssn engineering technology provides the optimization and transformation of clinker cement production line for everyone. Lvssn group has an independent development team, engaged in many cement clinker transformation activities, with rich experience and guidance, which can save energy and energy for cement plants.If you need, please contact us

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Active lime is produced from limestone dolomite chalk and other minerals with high calcium carbonate content by the calcination process under the temperature of 1000-1100 ° C. There are various processes for the active lime production mainly

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