Editing Refractory (section)

====Basic refractories====
Basic refractories are used in areas where slags and atmosphere are basic. They are stable to alkaline materials but can react to acids, which is important e. g. when removing [[phosphorus]] from [[pig iron]] (see [[Gilchrist–Thomas process]]). The main raw materials belong to the RO group, of which magnesia (MgO) is a common example. Other examples include dolomite and chrome-magnesia. For the first half of the twentieth century, the steel making process used artificial [[periclase]] (roasted [[magnesite]]) as a furnace lining material.

* '''Magnesite refractories''' are composed of ≥ 85% [[magnesium oxide]] (MgO). They have high slag resistance to lime and iron-rich slags, strong abrasion and corrosion resistance, and high refractoriness under load, and are typically used in metallurgical furnaces.<ref>{{Cite web|url=https://www.termorefractories.com/products/refractory-bricks-blocks/magnesite-refractories.html|title=Magnesite Refractories|website=www.termorefractories.com|access-date=2020-03-06}}</ref>
* '''Dolomite refractories''' mainly consist of [[calcium magnesium carbonate]]. Typically, dolomite refractories are used in converter and refining furnaces.<ref>{{Cite web|url=http://www.ruizhirefractory.com/en/new/dolomite-Brick-and-Magnesite-Dolomite-Brick.html|title=Dolomite brick and magnesia dolomite brick|website=www.ruizhirefractory.com|access-date=2020-03-06}}</ref>
* '''Magnesia-chrome refractories''' mainly consist of magnesium oxide (MgO) and [[Chromium(III) oxide|chromium oxide]] (Cr<sub>2</sub>O<sub>3</sub>). These refractories have high refractoriness and have a high tolerance for corrosive environments.