2. Mining and mineral processing
In 1781, the Swedish chemist C.W. Scheele isolated an unknown acid (tungstic acid) from a white mineral identified and named "tungsten" (heavy stone in Swedish) by A.F. Cronstedt in 1758, and named "scheelite" (CaWO 4 ) in 1821 by C.C. Leonhard.
Another mineral, "wolframite" [(Fe, Mn), WO 4 ], is mentioned under the term "wolfram" in a manuscript by J. Mathesius dated 1564. It was from wolframite that Spanish chemists J.J. and F. de Elhuyar also prepared tungstic acid and isolated, identified and named tungsten, in 1783, by reducing this acid with carbon.
2.1 Mining situation
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
The Ultimate Scientific and Technical Reference
This article is included in
Metal manufacturing processes and recycling
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Mining and mineral processing