Kiln for producing litharge by means of the calcination of massicot
AssigneeMinemet Italia S.p.A.
InventorRoberto Passarotto
Life of this patent
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Abstract
The kiln (1) for producing litharge has a thermally insulated tubular body (2) containing, throughout its length, a shaft (30) with paddles acting as an auger. The tubular body (2) is coaxial with an induction coil (11), which heats it. The raw material in powder form (i.e., the massicot) is charged at a first head (9) of the tubular body (2) and is moved forwards by the paddle shaft (30), until it reaches the second head (10), opposite to the first one (9). During the translation the material (massicot) is heated and is oxidated, being converted into litharge.
Claims17
A kiln for producing litharge by means of calcination of massicot or raw material in powder form advancing inside its interior which comprises screw feeder means having one single tubular body containing raw material, said tubular body having a major axis, a first head, and a second head, means for feeding raw material to the kiln installed at the first head, an electromagnetic induction heating unit along said tubular body wherein said electromagnetic induction heating unit is externally coaxial with the tubular body and comprises, starting from an external surface of said tubular body, a tube of ferromagnetic material, at least one layer of insulting refractory material and an induction coil and between the tubular body and the tube of ferromagnetic material an air space is provided, inside which an inert gas is contained, means for feeding oxidating air, and means for discharging the material from the kiln.
A kiln for producing litharge by mean of calcination of massicot or raw material in powder form advancing inside said kiln, which comprises;
- (a) screw feeder means having
- (i) one single tubular body containing a raw material, said tubular body having a major axis, a first head, and a second head,
- (ii) a shaft with paddles driven by a motor having beating means, said beating means comprise a plurality of hammers, wherein a blow applied by each hammer with respect to said shaft is compensated by a blow applied by the other hammer,
- (b) means for feeding raw material to said kiln installed at the first head;
- (c) an electromagnetic induction heating unit along the tubular body;
- (d) means for feeding oxidating air;
- and
- (e) means for discharging the material from the kiln.
Dependencies are inferred from the claim text.