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Teplotvornaja ability of firm fuel more low, than gaseous; uglevozdushnye mixes are subject to explosions; zolnost coals of 10-20%, and ashes, getting to a burnt raw mix, deforms settlement mineral structure klinkera. Fuel cost makes to 25% of the cost price of ready cement, therefore on cement works a lot of attention is given to its economy. дизельные электростанции переносные .
Raw materials Preparation. Manufacture portlandtsementa - the difficult technological and power-intensive process including:
1) extraction in career and delivery to factory of raw materials, limestone and clay;
2) preparation of a raw mix;
3) roasting of a raw mix before sintering - reception klinkera;
4) a grinding klinkera with the plaster additive - reception portlandtsementa; 5) magazinirovanie a ready product. To maintenance of the set structure and quality klinkera all technological operations are subordinated.
Preparation of a raw mix consists in thin degeneration and mixture of the components taken in an established parity that provides completeness of passage of chemical reactions between them and uniformity klinkera. Preparation of a raw mix is carried out dry, wet and combined in the ways.
The Dry way consists in crushing and close mixture of dry raw materials, therefore the raw mix turns out in the form of the mineral powder named a raw flour. Thin joint crushing of limestone and clay carry out in trumpet (spherical) mills in which the grinding and drying of raw materials to residual humidity of 1-2% are combined. At the large enterprises raw mills work on the closed cycle: installation by productivity to 100 tch includes the separators separating large fraction of a raw flour and returning it in a mill for a grinding.
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