The role of high temperature furnace in producing slag cement

The role of high-temperature furnace in the production of slag cement:

　Slag has potential hydraulic cementing properties. Under the action of cement clinker, lime, gypsum and other activators, it can show hydraulic cementing properties and is a high-quality cement raw material. Water slag can be used as a cement mixture or made into cement without clinker.

　　① Portland slag cement is made by mixing Portland cement clinker and water slag with 3% to 5% gypsum, or grinding separately and then mixing them evenly. Portland slag cement is referred to as slag cement.
　　 When grinding slag cement, the mixing amount of blast furnace slag has little effect on the compressive strength of the cement, but has a smaller effect on the tensile strength, so its mixing amount can be added to account for 20%-85% of the cement weight. In this way, it is very beneficial to improve cement quality and reduce cement production costs.

　　②Gypsum slag cement is a hydraulic cementing material obtained by mixing dry slag, gypsum, Portland cement clinker or lime according to a certain proportion, or grinding them separately and then mixing them evenly.
　　This kind of gypsum slag cement has low cost, good resistance to sulfate erosion and permeability, and is suitable for concrete hydraulic buildings and various prefabricated blocks.

　　③Lime slag cement is a hydraulic cementing material made by grinding dry slag, quicklime or slaked lime, and 5% or less natural gypsum in an appropriate proportion.
　　The mixing amount of lime is generally 10% to 30%, and its function is to stimulate the active ingredients in the slag to generate hydrated calcium aluminate and hydrated calcium silicate. If the amount of lime is too small, the active ingredients in the water slag are difficult to fully activate; if the amount is too much, the cement will not set properly and the strength will decrease.

　　Lime slag cement can be used for various pre-concrete products of steam curing, unreinforced concrete in water, underground and road surface, and industrial and civil construction mortar.

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