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Cement from Furnace Slag

Furnace slag can be made to furnish an excelare readily dissolved in dilute hydrochloric lent cement by selecting such portions of it as is made of baked gypsum or plaster of Paris, acid. On subjecting it to the action of the steeped in a saturated solution of alum, and acid, silica is thrown down, which is afterward then recalcined and reduced to powder. For to be washed, dried, and pulverized. One use, it is mixed with water, as ordinary part of this is next to be mixed with 9 parts plaster of Paris. This cement has been most powdered slag and the necessary quantity of slacked lime. This matter soon hardens, and rivals the best cement in its durability. extensively applied as a stucco; but the finer qualities (when colored by the simple process of infusing mineral colors in the water with which the cement powder is finally mixed for working), being susceptible of a high degree of polish, produce beautiful imitations of a mass as hard as stone that resists the action mosaic, and other inlaid marbles, scagliola, &c. The cement is not adapted to hydraulic purposes, nor for exposure to the weather, but has been used as a stucco for internal decorations, and from its extreme hardness is very durable. A pleasing tint is given to this cement by adding a little solution of green copperas to the alum liquor.