Copper <a href="https://en.wikipedia.org/wiki/flash_smelting" class="extiw" title="w:flash smelting">flash smelting</a> process, as invented by <a href="https://en.wikipedia.org/wiki/Outokumpu" class="extiw" title="w:Outokumpu">Outokumpu</a>. Adapted from work prepared for <a href="https://en.wikipedia.org/wiki/United_States_Environmental_Protection_Agency" class="extiw" title="w:United States Environmental Protection Agency">US EPA</a>.
<p>raster: US Environmental Protection Agency <br></p>
vector: <a href="//commons.wikimedia.org/wiki/User:Mliu92" title="User:Mliu92">Mliu92</a>
<p>raster: <a rel="nofollow" class="external text" href="http://www.epa.gov/ttnchie1/ap42/ch12/bgdocs/b12s03.pdf">Work prepared for US Environmental Protection Agency, figure 2.2-1</a> and text description of following steps <br></p>
vector: <span class="int-own-work" lang="en">Own work</span>