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El Indio矿位于智利圣地亚哥以北480km。由于该矿含金银原生矿物为硫砷铜矿,粗精矿砷和锑含量较高,因此,采用焙烧工艺除砷和锑,生产三氧化二砷副产品。焙烧采用14膛、直径6.5m的Nicols Herreshoff焙烧炉,其生产能力6.5～7t/h。焙烧炉上部的6个膛内加空气形成适宜的氧化条件,使砷和硫进行放热反应,炉温维持在700～720℃。在焙烧炉下部的7～14膛保持大气条件,进行还原,使砷、锑和硫以AsS_5和SbS_5烟气
El Indio mine is located 480km north of Santiago, Chile. As the mine’s gold and silver primary minerals are arsenic copper arsenic, crude concentrate arsenic and antimony content is high, therefore, the use of roasting process in addition to arsenic and antimony, the production of arsenic trioxide by-product. Roasting 14 holes, diameter 6.5m Nicols Herreshoff roaster, its production capacity of 6.5 ~ 7t / h. In the upper part of the roasting furnace, air is added into the six bores to form suitable oxidation conditions, and arsenic and sulfur are exothermic. The furnace temperature is maintained at 700-720 ° C. In the roaster under the 7 to 14 bore to maintain atmospheric conditions, the reduction of arsenic, antimony and sulfur to AsS_5 and SbS_5 flue gas