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  • Lithium
  • Because of its relative nuclear instability, lithium is less common in the solar system than 25 of the first 32 chemical elements even though its nuclei are very light: it is an exception to the trend that heavier nuclei are less common. (wikipedia.org)
  • Calcium
  • News stories in recent years have reported experiences of unfortunate individuals who have unknowingly consumed tainted or otherwise unsafe drinking water that included high levels of lead, calcium, arsenic, and other chemicals that have serious negative health effects. (environmental-expert.com)
  • Calcium carbonate is deposited where evaporation of the water leaves a solution supersaturated with the chemical constituents of calcite. (wikipedia.org)
  • production
  • Limestone has numerous uses: as a building material, an essential component of concrete (Portland cement), as aggregate for the base of roads, as white pigment or filler in products such as toothpaste or paints, as a chemical feedstock for the production of lime, as a soil conditioner, or as a popular decorative addition to rock gardens. (wikipedia.org)
  • Copper
  • Copper is usually leached using acid (sulfuric acid or hydrochloric acid), then recovered from solution by solvent extraction electrowinning (SX-EW) or by chemical precipitation. (wikipedia.org)
  • In this horizontal chemical reactor, where air was injected into copper matte, a molten sulfide material containing iron, sulphur and copper, to become molten blister, an alloy containing 99% copper. (wikipedia.org)
  • formation
  • A model for petroleum reservoir formation damage by chemical precipitation and fines migration is presented. (edu.ng)
  • This chemical addition results in the formation of heavier solids, which trap the colloidal solids or convert dissolved solids to settleable solids. (issuu.com)
  • compound
  • Sulfide (systematically named sulfanediide, and sulfide(2−)) (British English sulphide) is an inorganic anion of sulfur with the chemical formula S2− or a compound containing one or more S2− ions. (wikipedia.org)
  • After the solution is separated from the ore solids, the extract is often subjected to various processes of purification and concentration before the valuable metal is recovered either in its metallic state or as a chemical compound. (wikipedia.org)
  • Dietary supplements can be formulated to contain several different chemical elements (as compounds), a combination of vitamins and/or other chemical compounds, or a single element (as a compound or mixture of compounds), such as calcium (as calcium carbonate, calcium citrate, etc.) or magnesium (as magnesium oxide, etc.), or iron (as ferrous sulfate, iron bis-glycinate, etc. (wikipedia.org)
  • main
  • When cover crops are turned over into the soil, they contribute nutrients to the main crop so that less chemical fertilizer is required. (wikipedia.org)