US1091182A - Furnace for treating ore and the like. - Google Patents

Description

K. J. BBSKOW & A. RAMfiN.

FURNACE FOR TREATING ORE AND THE LIKE.

APPLICATION FILED APR.10, 1912.

Patented Mar. 24, 191i 4 SHEETS-SHEET 1.

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K. J. BBSKOW & A. R'AMEN.

FFIRNACB FOR TREATING ORE AND THE LIKE.

APPLICATION FILED APR. 10, 1912.

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FURNACE FOR. TREATING ORE AND THE LIKE.

APPLICATION FILED APR. 10, 1912'.

Patented Ma1;24,1911

4 SHEETB-SI-IEET 3.

K. J. BESKOW & A. RAMEN. FURNACE FOR TREATING ORE AND THE LIKE.

APPLICATION FILED APR. 10, 1912. 1 Q9] 1 2, Patented Mar. 24, 1914.

4 SHEETS-SHEET 4.

ATT'Y L'OLUMBIA P| J\NOGRAPH co.. WASHINGTON. D. c.

KNUT JAKOB BESKOW AND ARTHUR RAMEN, OF HELSINGBORG, SWEDEN.

FURNACE FOR TREATING ORE AND THE LIKE.

Specification of Letters Patent.

Patented Mar. 24, 1914.

Application filed April 10, 1912. Serial No. 689,933.

To all whom it may concern:

Be it known that we, KNUT JAKoB BESKOW and ARTHUR RAMiiN, chief engineers, subjects of the King of Sweden, residing in Stidra Storgat-an 19, Helsingborg, in the Kingdom of Sweden, have invented certain new and useful Improvements in Furnaces for Treating Ore and the like, of which the following is a specification.

The present invention relates to such furnaces for the roasting of ores and the like, which are provided with a rotatable vertical shaft, passing through the furnace, and carrying stirring or transporting members serving for the stirring or transport of the material from one compartment of the furnace to another. In furnaces of this type it is often of great importance to utilize a part of the heat, developed in the roasting process respectively to prevent loss of heat from the furnace. This purpose can be obtained by arranging channels in the brickwork forming the side-walls of the furnace and leading air or other gases through said channels. According to the present invention the said purpose is attained in a. favorable manner by forming vertical channels in the corner of the brickwork of a furnace, which in known manner is formed internally with a cylindrical but externally with a rectangular or substantially rectangular or square cross section. Furthermore, by this construction the heat of the furnace is utilized in a very efficient manner without loss. This arrangement is connected with the advantage, that the volume of the furnace is as completely as possible utilized whereby the space necessary for the furnace will be comparatively small and also the building-costs of the furnace will be comparatively small. This furnace also possesses over other furnaces of usual constructions the advantage, that the expensive tubes or pipes for the gases, which otherwise must be arranged outside the furnace, may be dispensed with without that the furnace requires a greater space than a cylindrical furnace with the same roasting surface or roasting capacity.

In order to make plain the invention, there is shown in the accompanying drawing by way of example, a form of construction of a furnace intended for the chloridizing roasting of ores, in Figure 1 in verticalsection along the line A-B in Fig. 3, in Fig. 2 in vertical section along the line G-D in Fig. 3, in Fig. 3 in horizontal section along the line EF in Fig. l. The Figs. 4 and 5 show in vertical section, and in horizontal section, respectively, a furnace arranged according to the present invention for the roasting of sulfur pyrites, or the like. Fig. 6 is a view similar to Fig. 1 showing a modified form of the furnace.

In Figs. l'3, l designates the brickwork of the furnace, which is divided in the wellknown manner by the arches 3, 4,5, 6 into several stages, which communicate with each other by means of openings 7, 8 arranged alternately at the periphery and at the center in such a way that the material which has been fed into the uppermost compart ment can, by the action of the stirring and transport devices 10, mounted on the rotatably arranged vertical shaft 9, and arranged in the well-known manner, he made to fall through the said openings 7 and 8 from one compartment or division of the furnace into the division next below it, in order finally to be carried off from the lowest division through the channel 11. According to the form of construction illustrated in Figs. l-3, which is intended for the chloridizing roasting of ores, and the like, 0. g. purple ore (burnt pyrites), the furnace is by the arch 3 divided into two, practically speaking, separate and gastight compartments, viz., the upper compartment 2, in which the ore, or, as it may be, the mixture of chlorids and ore, is heated by hot combustion gases (smoky gases) introduced therein, while the chloridizing roasting is carried on in the chloridizing compartment, viz., the compartment of the furnace lying under the said arch and divided by the arches 4, 5, 6 into several stages or divisions, from which compartment the gases generated in the chloridizing process are carried off, separately from the smoky gases serving for the heating of the material. In order to prevent gases from the heating compartment streaming into the chloridizing compartment or vice versa, the channels 7 in the arch 3 are in the wellknown manner provided with automatic devices acting in such a Way that the ore fed into them is dammed up in the said channels, thus forming a gas-tightpartition between the heating compartment and the chloridizing compartment, but is continually (or periodically) carried down into the lower compartment, fresh ore being the while introduced at the same rate into the channels, so that the latter are always filled. Such a damming up of the ore can, as shown in the drawing, be brought about 6. g. by arranging a ledge 12 at some distance under the lower mouth of the channels 7, whereby the ore is dammed up in the channel while ore is carried down from the said ledge into the chloridizing compartment by a scraper 13, Which scraper is mounted on the arm 10 carried by the rotating shaft 9 which also carries the stirring or transporting devices. The ore is admit-ted into the heating compartment through drums 15 by means of suitable devices from a hopper or charging funnel (not shown). Through the channels 16, 16, 17, 18, 19 arranged in the corners of the brickwork, the gases are admitted into or carried off from the furnace or the different compartments of the furnace, in the following manner: Through the channel 16, which communicates with the hearth 20, the smoky gases intended for the heating of the ore are first conveyed through the arch 5 which is formed into a mutlie, and therefrom'thro-ugh the vertical channel 18 to the heating compartment 2, where they give off heat to the material to be roasted, and are carried ofl from the said compartment, through the vertical channel 16 arranged in the opposite corner, from which channel 16 they are carried oil through the duct 21 to the chimney. If the path taken by these gases, is looked upon it will be evident that the heat contained in said gases is utilized to the best possible extent, as in their passage through the channels 16, 18, 16 they help to keep the brick Work surrounding the chloridizing compartment hot, or, as the case may be, to keep it from cooling, while at the same time heat is also given ofi through the arch 5 to the chloridizing compartment, so that in this way the temperature in it can be regulated at will. Through the channels 17, 19 arranged in the two other corners of the brickwork, the acid gases generated in the chloridizing compartment are carried off, for which purpose the said channels communicate through openings 23, which can be closed by dampers arranged in them, with the different stages of the chloridizing compartment. The channel 19 communicates through the channel 24 arranged in the floor of the furnace with the discharge or exhaust channel 25 common to both the channels 19 and 17. The air requisite for the chloridizing process is introduced into the chloridizing compartment either directly from outside through dampers or valves 32 arranged in the brickwork; or one may, for the same purpose, arrange vertical channels in the corner of the brickwork close to the channels 16, 17, 18, 19, in the same way as the channels 26 shown in Fig. 5, whereby is attained the advantage that the air is heated by the action of the gases streaming through the said channels. 29 designates beams serving for the anchoring of the masonry. This form of construction of the furnace can also be used with advantage for the roasting of lowper-cent. pyrites such as sulfur pyrites, magnetic pyrites, etc., in the roasting of which it is of importance both to introduce a good deal of heat for the initiation of the roasting process, and also to see that the losses of heat in the roasting compartment proper be as small as possible. In the roasting of ores of this nature the heating of the material is likewise carried on in the upper compartment 2, while the oxidizing roasting is carried on in the lower compartment, and the gases thereby generated, just as in the chloridizing roasting, are carried oil separately from the gases serving for the hcatlng.

It is obvious that the form of construction shown in Figs. 13 may be varied in the way illustrated by Fig. 6, 2'. 0., that the muffle in the arch 5 is excluded. In this case the gases are conveyed from the hearth 20 directly up to the heating compartment 2 through a channel 16 in the same corner as the hearth 20. From compartment 2 the smoky gases are conveyed through a channel 18 in the opposite corner down to an exhaust channel 28 for smoky gases, ar ranged in the ground.

The furnace shown in Figs. a: and 5 is intended for the roasting of high-per-cent. sulfur pyrites, in which a comparatively great generation of heat takes place, which heat can be utilized by this invention to a greater extent than otherwise. This furnace is not, like the one described above, divided into compartments separate from each other, but is constructed in one single compartment divided by arches into several stages or divisions communicating with each other. The gases generated in the furnace are carried off from the uppermost stage through the channels 27 to the common exhaust channel 28 placed under the floor of the furnace. The air is introduced into the furnace direct from outside, 0. g. through the so-called working openings 33. In order to be able to utilize the heat of the furnace there are arranged in the brickwork any number of vertical channels 20, through which air is conducted. The heated air escaping from the said channels may be suitably used for the drying of the pyrites, before it is fed into the furnace. Besides the above mentioned advantage of a cheaper anchoring and cheaper construction of the furnace as a whole, the present invention, when applied to pyrites furnaces, is also attended by the advantage that it does away with the otherwise necessary expensive insulated iron pipes for carrying off the roasting gases from the upper part of the furnace; these gases being new carried off in stead through the channels formed in the brickwork which channels, if found necessary, may be lined, beside which, as stated above, an advantageous utilization of the heat from the furnace through the arrangement of air channels can be obtained.

Having thus described our invention, we declare, that what we claim is 1. Roasting furnace divided in several superposed divisions and provided with a central vertical shaft carrying stirring devices, the brickwork of the furnace having internally a cylindrical but externally a rectangular cross-section, vertical channels be ing arranged in the corners of the brickwork, said channels communicating with the interior and adapted for leading off gases generated in the furnace.

2. Roasting furnace divided in several superposed divisions and provided with a central, vertical shaft carrying stirring devices the brickwork of the furnace having internally a cylindrical but externally a rectangular cross-section, vertical channels be ing arranged in the corners of the brickwork, said channels communicating with the interior and adapted for leading off gases generated in the furnace, a muflie formed in an intermediate bottom of the furnace, said muflle communicating with a channel arranged in one corner of the furnace, this latter channel communicating with the upper compartment of the furnace, said upper compartment communicating with an exhaust for gases through the in termediation of a vertical channel arranged in one corner of the furnace.

In witness whereof we have hereunto set our hands in presence of two witnesses.

KNUT JAKOB BESKOXV. ARTHUR RAMEN. Witnesses:

E1110 A. MoLLER, HEMMING MAMOS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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