US1926043A - Apparatus for sintering - Google Patents

Description

Sept 12, 1933. B. w. GONSER 1,926,043

APPARATUS FOR SINTERING Original Filed Jan. 24, 1950 INVENTOR. BRUCE W. GONSER I By 313,4

A TTORNEYS.

Patented Sept. 12, 1933 APPARATUS FOR SHNTERING Bruce W. Gonser, Arlington, Mass, assignorto American Smelting and Refining Company, New York, N. Y., a corporation of New Jersey Application January 24, 1930, Serial No. 422,998 Renewed December 2,1932

'7 Claims.

This inventidn relates to sintering, and more particularly to the removal of volatile metals in a sintering operation. The invention is espe cially applicable to the removal of cadmium and lead in the sintering of zinc ores.

It has been found that in a sintering operation the volatile metals tend to condense in the lower portion ofthe bed as they come in contact therewith and that the removal of these metals from the bed requires a higher temperature or a longer sintering period for the lower portion of the bed than for the upper portionthereof The present invention provides for so controlling the temperature and duration of the sintering in the various portions of the bed as to substantially eliminate the volatile metals from the various parts thereof. This is acconnplished by adding a quantity of fuel or raw ore at a predetermined portion of the bed,

as for example, near the bottom thereof, so that a greater heat may be developed when the zone of combustion reachesthis part of the bed during the sintering operation. For accomplishing this in auxiliary feeder is employed which is so arranged that the position in the bed to which the fuel is applied may be varied and controlled atwill. F i

The invention also consists in certain new and originalfeatures of construction and combinations of parts hereinafter set forth an claimed.

Although the novel features which are believed to be characteristic of this invention will be particularly pointed out in the claims appended hereto, the invention itself, as to its objects and advantages, the mode of its operation and the manner of its organization may be better understood by referringto the 'followiiig description taken in connection with the accompanying drawing forming a part thereof, in which Fig. 1 is a side elevation of a portion of the sinteringrmachine partly in section showing the arrangement of the feeders; and v 'Fig. 2 is a section taken on the line' 2-2 of Fig. 1.

Like reference characters denote like parts in the several figures of the drawing. I

In the following description and in the claims parts will be identified by' specific names-for convenience, but they are intended to be as generic in their application to similar parts as the art will permit. Referring to the drawing more in detail the invention is shown as applied to a sintering machine comprising a plurality of pallets 10 (Cl. 266-21)v charge to be deposited in a thin even layer.

The various parts of a sintering machine and the charging apparatus are well known in the art and are accordingly not described herein in detail.

For adding fuel or ore to the lower portion of the bed there is provided-an auxiliary feeder 20 which is mounted on. trunnions 2i. Feeder 220 communicates with chute 22 which receives material from traveling belt 23. Hopper 24 is mounted adjacent belt 23 and serves to apply the fuel or ore thereto.

For imparting an oscillatory motion to the feeder whereby the charge may be distributed evenly across the entire width of the pallets there is provided a crank ,25 which is connected by connecting rod 26 to rotating crank 27. Crank 27 may be operated in any convenient manner and causes a reciprocating movement of connecting rod 26 which in turn causes feeder 20 to pivot about trunnions 21.

For controlling the vertical distribution of the fuel in the pallets a nozzle 30 is pivoted, as by pivots 31, adjacent the end of feeder 20. Rod 32 is pivotally connected to said nozzle and is operated by lever 33 which is mounted on feeder 20. It is to be noted that'the pivotal position of nozzle 30 is determined by the position of. lever 33 and that the point of application of the charge is varied accordingly. An adjustable bafiie 34 is provided for further controlling the distribution of the charge and preventing the same from becoming segregated.

In the operationof the above described device for the sintering of zinc ores an auxiliary feeder. is used to apply a definite amount of coal, coke, raw sulphide ore or other suitable fuel to any desired portion of the sinter bed. The amount of fuel is accordingly increased at the desired point, especially near the bottom of the bed, and insures a substantial removal of the volatile metals therefrom. As the zone of combustion travels downwardlythrough the bed the volatile metals are first condensed in the colder portions of the bed. As the zone of combustion reaches the lower portion the extra heat produced by the added fuel causes these condensed metals to volatilize and to be substantially completely removed from the bed.

The reducing conditions produced by using an excess of carbon in the charge favor the elimination of cadmium, although the amount of zinc volatilized is comparatively small, seldom exceeding 1% of that charged into the machine.

It is to be noted that the position of the added fuel may be closely regulated by tilting nozzle 30 to apply the fuel at a prescribed point along the slope of the main charge. The corresponding regulation of bafiie 34 prevents the fuel from rolling down this slope to an undesired extent.

Although certain novel features of the invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the several steps of the process and in its operation and in the form and details of the apparatus illustrated may be made by thoseskilled in the art without departing from the spirit of the invention.

- cont olling the position of said nozzle for applying material at various points along the slope of the charge.

. 3. In combination with a sintering machine, a feeding apparatus including a charging chute for applying a sloping charge thereto, a baiiie for leveling off said charge and an auxiliary feeder for applying'an additional charge at a given point along the slope of the main charge.

4. In combination with a sintering machine, a feeding apparatus including a charging chute for applying a sloping charge thereto, a baffle for leveling off said charge, an auxiliary feeder for applying an additional charge at a given vpoint along the slope ofthe main charge, and

means for rocking said auxiliary feeder transversely of the bed to cause a substantially even transverse distribution of the charge.

5. In combination with a sintering machine, a feeding apparatus including a charging chute for applying a sloping charge thereto, a bafile for leveling off said charge, an auxiliary feeder for applying an additional charge at a given point along the slope of the main charge, and means associated with said auxiliary feeder for controlling the position of application of said charge along the slope of the main charge a whereby the vertical distribution of the auxiliary charge may be controlled.

6. In combination with a sintering machine, a", feeding apparatus including a charging chutef for applying a sloping charge thereto, a baffle i for leveling off said charge and an auxiliary feeder for applying an additional charge at a given point along the slope of the main charge, an adjustable bathe in a position to contact with the charge applied by said auxiliary feeder 1e and to control the distribution thereof.

7. In combination with a sintering machine, a feeding apparatus including a charging chute for applying a sloping charge thereto, a baffle for leveling off said charge, an auxiliary feeder W for applying an additional charge at a given point along the slope of the main charge, a nozzle pivoted to said auxiliary feeder, and means for controlling the position of said nozzle for applying the charge-to a predetermined point 1 in the bed. A g

BRUCE W. GONSER.

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