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Early comments[edit]

  • just a short comment. Slag is not only produced by metallurgy industry, but is also coming from coal fired power plants. In some countries that is the mayor part of industrial waste. 11:34, 19 October 2005 User:
This should be referred to as fuel ash. Peterkingiron (talk) 16:15, 12 December 2011 (UTC)
  • Slag is a metal oxide. Some times, it has other impurities like S, P, Si etc but the major component of a slag is that its composition is mainly oxidized metal or oxidized metals. 21:26, 1 June 2006 User:
No necessarily metal oxides, Commonly SiO2 is a major constituent. Peterkingiron (talk) 16:15, 12 December 2011 (UTC)
No clue - removed the link, if someone had a reason then put it back (and explain relevance here please). Vsmith 00:31, 6 December 2006 (UTC)

Merge from basic slag[edit]

The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.
The result was merge. Wizard191 (talk) 14:55, 25 November 2010 (UTC)

In steelmaking areas, basic slag is an important type of fertilizer for farmers and gardeners because of its phosphate content. It is distinct from other types of slag such as blast furnace slag. Anthony Appleyard (talk) 14:47, 22 March 2008 (UTC)

According to the basic slag article it comes from the Bessemer process and this article talks about slag in general so I don't see how this isn't inclusive. --Wizard191 (talk) 14:12, 23 March 2008 (UTC)
Merged articles awhile back Wizard191 (talk)

The above discussion is closed. Please do not modify it. Subsequent comments should be made in a new section.


If you are using 18,000 lbs lime a heat and reduce it to 14,000 a heat and the lime in the slag goes up. Why does this happen? —Preceding unsigned comment added by Slag101 (talkcontribs) 02:20, 11 July 2008 (UTC)


"basic slag must contain at least 12% total phosphoric acid (P2O5)" – the chemical formula if fishy. Phosphorus pentoxide reacts with water violently, so this is probably an error. Vadim Makarov (talk) 08:32, 30 November 2008 (UTC)

The reported temperature of 2600 degrees under "Modern slag uses" is clearly a conversion error and should be Fahrenheit and not Celsius: BF slag is tapped around 1500 degree C and cools in the runner to something like 2600 degree F at granulation [H. Saxen]

Done. Wizard191 (talk) 14:54, 25 November 2010 (UTC)

Other uses[edit]

One use of slag I didn't see mentioned is road treatment. Where I live they used to spread it on roads in advance of winter weather to improve traction. I don't know if it's still used for that purpose anywhere, but as school kids we loved to hear "the slag trucks are out" on the news because it meant no school tomorrow. —Preceding unsigned comment added by SquareWave (talkcontribs) 16:02, 19 January 2009 (UTC)

Volcanic slag[edit]

The volcano article on Tuff mentioned that small-scale tephra (volcanic ash) is "slaggy" and linked to Slag. Can any more to be said about that here, such as what in particular makes them "slaggy"? —Preceding unsigned comment added by (talk) 06:56, 27 January 2009 (UTC)


There are a number of types of slag, derived from different metallurgical processes. Some are glassy; others are not. I do not feel this article yet provides an adequate coverage. Peterkingiron (talk) 16:12, 12 December 2011 (UTC)

Illegal use of slag ![edit]

Occasionally one reads stories of pieces of slag sold at exorbitant prices as pieces of meteorite. Old_Wombat (talk) 09:52, 16 January 2012 (UTC)


Steel slag + Carbon Dioxide = Precipitated Calcium Carbonate. [1] (talk) 22:59, 21 September 2014 (UTC)