Slag

Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. However, slags can contain metal sulfides and elemental metals. While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal.

Ore smelting

In nature, iron, copper, lead, nickel and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals. During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. Slag is the collection of compounds that are removed. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. In this case, the slag is termed synthetic. A good example is steelmaking slag: quicklime and magnesite are introduced for refractory protection, neutralising the alumina and silica separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.

Slag (disambiguation)

Slag (a liquid) is a by-product of smelting ore. Slag, as a liquid, is distinguished from dross, which is a solid.

Welding slag (a solid) is a form of slag produced as a byproduct of some arc welding processes.

Slag may also refer to:

Arts and entertainment

Other uses

Slag (play)

Slag is a 1970 play by British writer David Hare.Original cast: Lynn Redgrave, Anna Massey, and Barbara Ferris. Originally staged by the Royal Court. London

Slag is a biting satire in which the only characters are the three teachers of a tiny isolated girls' school. The play begins with a mutual vow reminiscent of the vow beginning the play Lysistrata in which Greek women vow to deny men sex to protest the Peloponnesian War. The three women teachers mutually pledge to abstain from sexual intercourse, in protest against the dominance and abusive treatment of women by men, epitomized in the slur against women as "slags." Conflicts among the teachers' different visions of radical feminism, different motivations, and different interpretations of and commitment to the vow become the grist for duplicitous dominant and abusive acts among them and distracts them from their teaching. Dominance and Feminism are ridiculed alike, while the number of pupils dwindles to zero in the resulting dysfunctional environment, leaving the three teachers to go their separate ways.

Spoke

A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface.

The term originally referred to portions of a log that had been split lengthwise into four or six sections. The radial members of a wagon wheel were made by carving a spoke (from a log) into their finished shape. A spokeshave is a tool originally developed for this purpose. Eventually, the term spoke was more commonly applied to the finished product of the wheelwright's work, than to the materials he used.

History

The spoked wheel was invented to allow the construction of lighter and swifter vehicles. The earliest known examples are in the context of the Andronovo culture, dating to ca. 2000 BC. Soon after this, horse cultures of the Caucasus region used horse-drawn spoked-wheel war chariots for the greater part of three centuries. They moved deep into the Greek peninsula where they joined with the existing Mediterranean peoples to give rise, eventually, to classical Greece after the breaking of Minoan dominance and consolidations led by pre-classical Sparta and Athens. Celtic chariots introduced an iron rim around the wheel in the 1st millennium BC. The spoked wheel was in continued use without major modification until the 1870s, when wire wheels and rubber tires were invented.

Spoke (disambiguation)

A spoke is a rod connecting the hub of a wheel with the traction surface.

Spoke or Spokes may also refer to:

See also

Spoke (album)

Spoke is the 1996 debut album of Calexico, an Americana/indie rock band from Arizona. It was initially released in Germany (Hausmusik label) under the group name Spoke.

Track listing

Personnel