SCORIA SLAG GRINDING LINE

Scoria
Scoria is also called mineral waste residue.
Scoria is a volcanic rock containing many holes or vesicles. It is most generally dark in color (generally dark brown, black or red), and basaltic or andesitic in composition. Scoria is relatively low in mass as a result of its numerous macroscopic ellipsoidal vesicles, but in contrast to pumice, all scoria has a specific gravity greater than 1, and sinks in water. The holes or vesicules form when gases that were dissolved in the magma come out of solution as it erupts, creating bubbles in the molten rock, some of which are frozen in place as the rock chills and solidifies. Scoria may form as part of a lava flow, typically near its surface, or as fragmental ejecta (lapilli, blocks and bombs), for instance in Strombolian eruptions that form steep-sided scoria cones. Most scoria is composed of glassy fragments, and may contain phenocrysts.

Uses
Scoria has several useful characteristics that influence how it is used. It is somewhat porous, has high surface area and strength for its weight, and often has striking colours. Scoria is often used in landscaping and drainage works. It is also commonly used in barbeque grills.
Scoria can be used for high-temperature insulation.
The quarry of Puna Pau on Rapa Nui/Easter Island was the source of a red coloured scoria which the Rapanui people used to carve the pukao (or topknots) for their distinctive moai statues, and to carve some moai from.

Grinding:
To the scoria,the best way is to grind it together with clicker and gypsum.
And the second : scoria grind alone ,and then mix the ground scoria with clinker and gypsum into cement.
third:scoria (slag) grind alone beforehand,again with grinding clinker,gypsum together.But because of the first kind of grinding technology is concentrated in the coarse powder,it just play a mixing role in the step.

So the MTM and MCF coarse mill ,and ball mill is for the grinding.

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