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AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsGerhard Melcher, Horst Weigel
Estimating the term…
A method and apparatus for the continuous recovery of tin of low iron content from an iron rich concentrate wherein the concentrate is smelted in suspension in an atmosphere ranging from neutral to weakly reducing to produce a smelt containing tin and iron silicates, the smelt is reduced with a gaseous reduction agent under conditions of high velocity jet treatment, the reduction being at a suitable reaction temperature and with a reduction potential of reducing gas so as to substantially prevent the reduction of the iron silicate to metallic iron.
An apparatus for the recovery of tin from an iron rich tin concentrate which comprises:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Obtaining tin: by dry processes
Technologies related to metal processing: recycling
Production and refining of metals
Low-carbon manufacturing
Term ended 20 Oct 1998 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to the recovery of tin from iron containing tin concentrates through the utilization of a suspension smelting reaction, and a high velocity gas reduction reaction carried out continuously.
2. Description of the Prior Art
FIG. 1 is a phase diagram showing the various phases of Sn/SnO.sub.2 /Fe/FeO for various reduction potential;
FIG. 2 is a phase diagram for Sn/SnSiO.sub.3 /Fe/FeSiO.sub.3 in relation to the reduction potential;
FIG. 3 is a phase diagram of Sn/SnSiO.sub.3 /Fe/FeSiO.sub.3 depending on the mol fractions of SnO;
According to the present state of the art, as previously noted, the recovery of tin present as an oxide takes place by means of smelting the oxide in the form of a concentrate in a revolving reverberatory furnace, a stationary hearth type furnace or an electrical furnace under reducing conditions. The reducing medium almost invariably consists of solid coal which must be low in ash and volatile constituents. The reduction reaction proceeds in the following overall equation:
2SnO.sub.2 +3C=2Sn+2CO+CO.sub.2 (I)
Thermodynamically, the chemical equilibrium of the overall reaction can be expressed as follows: ##EQU1## Where a is the activity of the liquid and solid reaction participants,