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Ground granulated slag reacts with water to produce cementitious properties.

Slag is the collection of compounds that are removed.

In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. A good example is steelmaking slag: quicklime and magnesite are introduced for refractory protection, neutralising the alumina and silica separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.

This process causes several chemical reactions to take place within the slag, and gives the material its cementitious properties.

The water carries the slag in its slurry format to a large agitation tank, from where it is pumped along a piping system into a number of gravel based filter beds.

During the Bronze Age of the Mediterranean there were a vast number of differential metallurgical processes in use.

A slag by-product of such workings was a colorful, glassy, vitreous material found on the surfaces of slag from ancient copper foundries.As the slag is channeled out of the furnace, water is poured over it.This rapid cooling, often from a temperature of around 2,600 °F (1,430 °C), is the start of the granulating process.Slag from steel mills in ferrous smelting, on the other hand, is designed to minimize iron loss and so mainly contains oxides of calcium, silicon, magnesium, and aluminium.Any sandy component or quartz component of the original ore automatically carries through the smelting process as silicon dioxide.Since the unit volume of Portland cement is reduced, this concrete is less vulnerable to alkali-silica and sulfate attack.

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