Search results
Results from the WOW.Com Content Network
Fluorite mining (the main source of fluorine) was estimated in 2003 to be a $550 million industry, extracting 4.5 million tons per year. [4] Mined fluorite is separated into two main grades, with about equal production of each. Acidspar is at least 97% CaF 2; metspar is much lower purity, 60–85%.
Ceramic grade fluorite (85–95% CaF 2) is used in the manufacture of opalescent glass, enamels, and cooking utensils. The highest grade, "acid grade fluorite" (97% or more CaF 2), accounts for about 95% of fluorite consumption in the US where it is used to make hydrogen fluoride and hydrofluoric acid by reacting the fluorite with sulfuric acid ...
The lethal dose for most adult humans is estimated at 5 to 10 g (which is equivalent to 32 to 64 mg elemental fluoride per kg body weight). [ 53 ] [ 54 ] [ 55 ] A case of a fatal poisoning of an adult with 4 grams of sodium fluoride is documented, [ 56 ] and a dose of 120 g sodium fluoride has been survived. [ 57 ]
The fluorite structure refers to a common motif for compounds with the formula MX 2. [1] [2] The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structure. Many compounds, notably the common mineral fluorite (CaF 2), adopt this structure.
Fluorite production (tonnes) by country Country (or area) Production World 5,500,000 China * 3,000,000 Mexico 936,433 South Africa * 240,000 Russia * 210,000 Spain
[64] [75] [76] The composition of fluorite was later determined to be calcium difluoride. [77] Hydrofluoric acid was used in glass etching from 1720 onward. [note 6] Andreas Sigismund Marggraf first characterized it in 1764 when he heated fluorite with sulfuric acid, and the resulting solution corroded its glass container.
The Southern Philippines Agri-Business and Marine and Aquatic School of Technology, formerly known as Malita Agri-Business and Marine and Aquatic School of Technology, [1] is a public college in Malita, Davao Occidental, Philippines. It is mandated to provide higher technologies and vocational instruction and training in science, agricultural ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us