Betterton-Kroll process — ▪ metallurgy method widely used for removing bismuth from lead by adding calcium and magnesium to a molten lead bismuth bath. Compounds are formed with bismuth that have higher melting points and lower densities than lead and thus can be… … Universalium
Kroll — may refer to:* Kroll Inc., a risk consultancy and technology firm specializing in data recovery, business intelligence, and financial investigations. Kroll is the surname of: * Eric Kroll, (* 1946), US photographer * Fredric Kroll, (* 1945), US… … Wikipedia
Industrial process — Industrial processes are procedures involving chemical or mechanical steps to aid in the manufacture of an item or items, usually carried out on a very large scale.Industrial processes are the key components of heavy industry.Most processes make… … Wikipedia
Betts electrolytic process — The Betts electrolytic process is an industrial process for separating lead and bismuth. It is named for its inventor Anson Gardner Betts.Process description for leadThe electrolyte for this process is a mixture of lead fluorosilicate (PbSiF6)… … Wikipedia
lead processing — Introduction preparation of the ore for use in various products. Lead (Pb) is one of the oldest metals known, being one of seven metals used in the ancient world (the others are gold, silver, copper, iron, tin, and mercury). Its low… … Universalium
nitrogen group element — ▪ chemical elements Introduction any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… … Universalium
Lead — (pronEng|ˈlɛd) is a main group element with a symbol Pb ( la. plumbum). Lead has the atomic number 82. Lead is a soft, malleable poor metal, also considered to be one of the heavy metals. Lead has a bluish white color when freshly cut, but… … Wikipedia
Bismuth — (pronEng|ˈbɪzməθ) is a chemical element that has the symbol Bi and atomic number 83. This heavy, brittle, white crystalline trivalent poor metal has a pink tinge and chemically resembles arsenic and antimony. Of all the metals, it is the most… … Wikipedia
