Volcanic rock commonly known as pumice or porous basalt, also known as pumice rock, it is a dense porosity of molten magma condensed by volcanic eruption glassy lava, the porosity volume accounted for more than 50% of the volume of the rock.

The main oxides of fly ash in China's thermal power plants are SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2 and so on. With the development of electric power industry, the discharge of fly ash from coal-fired power plants is increasing year by year, and it has become one of the industrial wastes with large displacement in China. If a large amount of fly ash is not treated, it will produce dust and pollute the atmosphere. If discharged into the water system, it will cause the silting of the river, and the toxic chemicals in it will also cause harm to human and biological. But fly ash can be used as resources, such as as an admixture of concrete.

Light stone, also known as pumice or pumice rock, is named because of its more pores and small volume weight (0.3-0.4) and can float in water. Lite is a kind of porous, light glassy acid volcanic extrusive rock, its composition is equivalent to rhyolite. The surface of light stone is rough, the particle bulk weight is 450kg/m3, the loose bulk weight is about 250kg/m3, the porosity is 71.8-81%, and the water absorption is 50-60%.

Perlite is a commonly used building insulation material in the construction industry and is often used in external wall insulation. Perlite has strong water absorption and is easy to seep water and gain weight, and the outer layer needs to be a waterproof coating when it is usually used for external wall insulation.

Volcanic stone (volcanic rock or pumice) is a kind of glassy lava with dense pores formed by the rapid expansion of internal gas due to the sharp reduction of pressure after the sudden cooling of magma during the volcanic eruption. The pore volume accounts for more than 50% of the rock volume. It is called pumice because of its many pores, light weight and ability to float on the surface of the water. It is characterized by high strength, heat preservation, heat insulation, sound absorption, fire protection, acid and alkali resistance, corrosion resistance, and no pollution, no radioactivity.

Fly ash is a multi-purpose material, which is not only widely used in the field of building materials, but also plays an important role in environmental protection and industrial fields.

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The density characteristics of volcanic rocks depend on their composition and formation process.

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