PUMICE

Volcanic ash powder refers to crushed rocks and mineral particles that are less than 2 mm in diameter emitted by volcanoes. In an explosive volcanic movement, solid rocks and molten slurry are broken down into fine particles to form volcanic ash. It has Chemicalbook pozzolan activity, that is, it can react with lime (CaO) at room temperature and in the presence of water to form a hydrate with hydraulic gelling ability. Therefore, it can be used as a mixing material for cement and an admixture for concrete after grinding.

1. Building materials: Lightweight concrete such as plaster, decorative board filler is 2% lighter than ordinary concrete, and its refractoriness is 2% higher; block bricks, building slabs, load-bearing components, hydraulic engineering, thermal engineering, and bridge engineering building components; Railway ballast; cement (using pumice as raw material).

2. Grinding industry: glass and glasses abrasives, soft metal and plastic polishing agents, kinescope and phosphor screen polishing agents, polishing metals (silver, copper, furniture, musical instruments) before electroplating, cleaning and rubbing wood, metal surfaces, and stones.

Filling: Scrubbing agent for metal tableware. Circuit board cleaning abrasive. Decontamination powder for soap and work clothes washing.

3. Daily chemicals: cosmetic materials, toothpaste, machine soap and cosmetic fillers.

4. Petrochemical industry: molecular sieve. Fillers for rubber, asphalt, paper, paint, etc., filters, insecticide carriers, ceramic glazes, enamel ingredients. Replace light calcium carbonate as plastic filler.

5. Thermal insulation materials: Pumice stone is used as the main raw material, and it is melted at high temperature to make mineral wool and its products, which are used for ceiling sound insulation.

Minerals and ore types: Due to the different temperature and pressure of volcanic eruptions, their mineral composition and composition are very different. According to their composition, pumice deposits can be divided into basaltic, rhyolite, andesite, and trachytic deposits.

China's pumice resources are very rich. Pumice minerals are distributed in the volcanic distribution areas from Heilongjiang in the north to Hainan Island in the south, most of which are in the north, with better quality and newer eruption dates. China's pumice resources are dominated by basalt pumice. Rhyolite pumice is only found in the Changbai Mountain area, and andesitic rocks are relatively rare, only in the Tianchi of Changbai Mountain.

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