US1788767A - Device for roasting sulphur containing substances, especially metal sulphides containing ores - Google Patents

Description

.1 13,]193L. H. KLE'NCKE 1,788,767

DEVICE FOR ROASTING SULPHUR CONTAINING SUBSTANCES, ESPECIALLY METAL SULPHIDES CONTAINING ORES Filed Sept. 15. 1928 2 Sheets-Sheet. 1

' H. -KLENCKE e SULPHUR -coNTA INING YSUBSTA METAL SULPHIDES CONTAINING ORE Filed Sept. 15, 192s Jan;l3,-.l93l

DEVICE FOR ROASTIN ESPECIALLY 2 Sheets-Sheet 2 Patented Jan. 13, 1931 UNITED "STATES,

ATE-N OFFICE.

HANS KLENC'KE, or rRANk'roRT oNaHE-Miam, GER1VIANY DEVICE FOR ROASTINGi- SULPHUR CONTAINING SUBSTANCES, ESPECIALLY METAL SULPHIDES CONTAINING ORES 4 Application filed September 15, 1928, Serial No This invention relates to a method and a device for roasting sulphur-containing substances especially metal sulphides containing ores.

When roasting sulphur containing raw materials such as pyrite, zinc blend or the like in mechanical roasting furnaces, it is usual to let the material-to be roasted drop as seldom as possible and to make the drop as low aspossible from one flonr to the other floor of the furnace, in order to avoid an excessive formation of dust. The removal of the sulphur from the ore took .place therefore generally only on the horizontal floors of the furnace; one could however clearly notice a flaming up of the material, when it dropped from one floor to the other floor in the furnace. This flaming up was due to an accelerated combustion produced by the thorough mixture of the material with the oxygen of the air present in the furnace. It could further be noticed, that the different floors of the furnace were never equally bright, and that the combustion of the material passing across one fioor was slowly decreasing during its passage and only revived by the dropping upon the next floor.

The improvement however of the dust collecting devicesmakes it unnecessary .to work under such conditions, that the formation of dust is avoided; operations may therefore be conducted in such a manner, that dust is formed, as the dust collecting apparatus especially the electrodynamic apparatus have "been so perfected, that it is absolutely immaterial, whether the furnace makes more or less dust.

\Vhereas formerly more than 7 or 8 floors were not used in mechanical roasting furaces there is no trouble nowadays to increase the floors to 10 and 12.' The increase in the capacity of mechanical roasting furnaces by applying more floors than before may be further raised by using fall openings on 306,267, and in Germany September 13, 1927.

the floors not only at the periphery and in the center of the furnace, as was hitherto the case, but also between these two places, thus providing the whole roasting surface of the floors with fall openings, which are arranged irregularly or centrally around theshaft of the furnace. By this arrangement of the fall openings the mixing of' the material to be roasted with the oxygen dropping stream of the material only contacted-with a vertically raising gas stream,

whereas according to the new, arrangement it is possible to let the gas stream horizontally pass through the vertically .dro'pping stream of the material.

The arrangement of fall openings between the usual fall openings, that is between the periphery and the centre of the fioor makes it possible, for the middle part of the furnace to be fed with material having a higher sulphur content than the material which formerly passed across the whole fioor. Thus the main combustion zone of the furnace is enlarged and the capacity of the furnaces may be raised.

By the use of insertion pieces of ceramic material, iron alloys or the like the size of the openings in the floors may be regulated; the insertion pieces may also be used to close some openings entirely.

In the old mechanical roasting furnaces air was introduced at the lowest floor and in about the middle of the floors. With the new mechanical roasting furnaces, having fall openings all over the floors and a greater number of floors, one may introduce air at one, two, three or more places as may be desirable for obtaining a good desulphurization and a great production.

The annexed drawings show a mechanical roasting furnace according to the invention by way of example.

' *In the drawings,

Fig. 1 is an elevation in partial section of the furnace;

,Fig. 2 is a detail in partial section of one chamber of the furnace; v

Fig. 3'-is a section on line 3 3 of Fig. 2; and

Fig. '4 is a horizontal section on line 4-4 of Fig. 2. 1

The furnace has ten floorsI-X. A is the exterior wall of the furnace, B the shaft of the furnace provided with stirrers R on each of the ten floors. The ore enters the first floor of the furnace by the opening E and is slowly moved from floor to floor by the stirrers. Besides the normal fall openings F around the shaft and besides theusual fall openings G at the periphery of the floor there are arranged some additional fall openings H in several floors. Especially the floors in'the middle of the furnace are provided with the greatest number of additional fall openings H. flhe main amount of air is introduced into the furnace in the usual manner through the hollow shaft B by a fan and by a tubing L. The additional openings L L L ,may be used for adding further amounts of air. I The gases obtained by the roasting process leave the furnace at S, whereas the roasted ore leaves the furnace at N at the bottom. The shaft is driven in usual manner and the driving arrangement has therefore not been floors of the furnace. Thus for example one or two oil burners may be arranged in the lowest floor as shown in Fig. 2.

I claim from the center to the periphery and from the periphery to the center of alternate floors, a floor provided with auxiliary openings intermediate the periphery and the center of the floor in addition to the principal openings at the center and the periphery of alternate floors respectively.

In testimony whereof I afiix my signature.

I HANS KLENCKE.

'1. A mechanical roasting furnace of the type comprising a plurality of floors and a rabble arm on each fioor adapted to move the material to be roasted alternately from thecenter to the periphery and from the periphery to the center of alternate floors, wherein atleast some of the floors of the furnace are provided with auxiliary open- Y ings intermediate the periphery and the center of the floors in addition to the principal openings at the center and the periphery of alternate floors, respectively.

2. In a mechanical roasting furnace of.

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