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How is metallic arsenic produced from arsenopyrite?

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A labeled diagram of the periodic table entry for arsenic, showing its atomic number 33, symbol As, atomic weight 74.921595, electron configuration, and classification as an other nonmetal. Additional icons indicate arsenic is solid at room temperature, has a rhombohedral crystal structure, and weakly acidic oxides. — arsenic Properties of arsenic.

Metallic arsenic is produced from arsenopyrite by heating the ore at temperatures between 650 and 700 °C in the absence of air.1

Alternatively, arsenic is commonly obtained as a byproduct from the roasting of various metal ores, including arsenopyrite. This process involves heating the ore in the presence of air to form the oxide ${As}_{4} O_{6}$ , also known as "white arsenic." This oxide vapor is collected, condensed, and subsequently purified through resublimation. Most commercial metallic arsenic is then prepared by the carbon reduction of this collected arsenious oxide dust.1