FIELD: metallurgy.
SUBSTANCE: proposed method comprises smelting initial material to produce vitreous arsenic trisulfide. Arsenic-bearing sulfide cake is subjected to neutralisation given its moisture content does not exceed 0.5%. Smelting is performed in protective capsule preformed from liquid dump slag at 350-400°C using the heat of said dump slag. Then, buffer layer of heat-insulation material is formed on the surface of obtained cake melt. Now, said protective capsule is sealed by coating its surface with buffer layer of liquid dump slag to be hardened thereafter. Aforesaid heat-insulation layer represents crushed slag and/or quartz sand and/or undersized crushed stone.
EFFECT: higher efficiency.
2 cl, 1 tbl, 1 ex
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