Atomistry » Nickel » Production » Ore Roasting
Atomistry »
  Nickel »
    Production »
      Ore Roasting »

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.

Last articles

Zn in 7L3L
Zn in 7KSO
Zn in 7KSR
Zn in 7KTP
Zn in 7LMM
Zn in 7LMK
Zn in 7LLZ
Zn in 7LLF
Zn in 7L0N
Zn in 7LBR
© Copyright 2008-2020 by
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy