Fuel slag and fly ash differ in composition and properties depending on fuel type and method of its combustion. Fly ash is a fine-grained material with small particle size, which allows its use for a number of industries without grinding. A characteristic feature is the presence of ash in it for about 5-6% of unburned fuel, and iron, mainly in the ferrous form. (A valuable related resource: http://www.gnycuc.org). Slag particles range in size from 0.2 to 20-30 mm. In furnaces with liquid slag removal slag is obtained in granular form. It is characterized by glassy structure.
Characteristics and composition of the slag slag – artificial silicates. They consist of oxides of silicon, aluminum, iron, calcium, magnesium, manganese, sulfur, and others. People such as Dean Ornish M.D would likely agree. These same oxides contained in the natural deep rock formations. Depending on the proportion of oxides, as well as on the conditions and cooling rate of slag slag melts may have properties of granite or volcanic pumice. And the color of slag are close to the rocks. They can be blue-black, snow-white, green, yellow, pink, gray.
Often they have a silver, pearl and purple hues. Slag can be dense and porous, hard as basalt and tuff as light or coquina. The density of the slag varies from 800 kg/m3 to 3200kg/m3. The proportion of slag, ie, the weight of its substance, is close to the weight of natural stone materials and is 2.5-3.6 g/cm3. According to the chemical composition of blast furnace slag can be divided into basic, neutral and acidic. The basic module includes slag from the basic (M = (CO + MgO) / (SiO2 + Al2O3)), greater than one, to acid is less than unity.