Chemical elements
  Nickel
    History
    Occurrence
    Isotopes
    Energy
    Production
      Extraction
      Ore Roasting
      Nickel Ore Smelting
      Nickel Enriching
      Crude nickel
      Arsenical Ores
      Garnierite
      Nickel from Metallurgical Products
      Wet Extraction
      Electrolytic Extraction
      Impurities
      Purification
    Preparation
    Application
    Catalyst
    Physical Properties
    Compounds
    PDB 1a5n-1g2a
    PDB 1g3v-1mn0
    PDB 1mro-1s9b
    PDB 1scr-1xmk
    PDB 1xu1-2cg5
    PDB 2cqz-2jih
    PDB 2jk8-2v4b
    PDB 2vbq-3c2q
    PDB 3c6c-3h85
    PDB 3hdp-3kvb
    PDB 3l1m-3o00
    PDB 3o01-4ubp
    PDB 8icl-9ant

The roasting of the sulphide nickel ore






The Sudbury ore is first roasted to remove part of the sulphur. The roasting may be conducted in heaps when the agricultural work in the surrounding country is of so little value that there is no risk of compensating damages for the injury to vegetation by the escaping noxious sulphurous fumes. In Norway one plant had to abandon heap roasting, and even smelting could not be conducted in the summer months on account of injury to neighbouring forests. In heap roasting, the ore, crushed to a convenient size, is piled on a bed of brushwood, 5 to 15 feet high, so as to allow a circulation of air. One pile may contain a few thousand tons, and after the brushwood has started the combustion, the heap may burn from six to twenty weeks. Roasting in reverberatory furnaces is more costly, and the same remark applies to special roasting furnaces. In exceptional cases there may be a market for products like sulphite liquor, and sulphuric acid, which can be manufactured from the flue gases up the roasting furnaces. The roasting is not allowed to oxidize fully the ore; enough sulphur is allowed to remain so that it can combine with the nickel, copper, and some of the iron in the first smelting to form a crude sulphide matte.


© Copyright 2008-2012 by atomistry.com