Pellet fuels (or pellets) are a type of solid fuel made from compressed organic material.Pellets can be made from any one of five general categories of biomass: industrial waste and co-products, food waste, agricultural residues, energy crops, and untreated lumber. Wood pellets are the most common type of pellet fuel and are generally made from compacted sawdust and related industrial wastes from the milling of lumber, manufacture of wood products and furniture, and construction. Other industrial waste sources include empty fruit bunches, palm kernel shells, coconut shells, and tree tops and branches discarded during logging operations. So-called "black pellets" are made of biomass, refined to resemble hard coal and were developed to be used in existing coal-fired power plants. Pellets are categorized by their heating value, moisture and ash content, and dimensions. They can be used as fuels for power generation, commercial or residential heating, and cooking.
Limestone (calcium carbonate CaCO3) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO3. Limestone forms when these minerals precipitate out of water containing dissolved calcium.
Black sands are sandy deposits that contain a high percentage of heavy metals of economic importance because they enter into important strategic industries, and they are named so because they contain a high percentage of dark-black minerals (iron minerals) such as ilmenite and magnetite.
Black sand contains a percentage of economic minerals (ilmenite - zircon - magnetite - rutile - agate) and monazite, which contains radioactive minerals. Many countries extract heavy minerals from the black sands they host due to their economic importance. Also, the beaches are cleared of environmentally harmful radioactive substances
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