DE624647C - Roestofen - Google Patents

Description

Roasting oven For burning and roasting dusty substances in suspension In a shaft furnace, different types of furnace are known, according to which the to be treated Good either together with the fuel or in different directions in the Furnace is blown in. All of these methods have the disadvantage that within of the furnace there is a strong turbulence in the furnace atmosphere, which causes settling the finished treated ore particles is made more difficult.

The present invention relates to an improvement of the known types of furnace through a special design of the furnace, through which on the one hand the most uniform and effective roasting possible and on the other hand an extensive control of the furnace cycle is achieved, whereby an increase in the output of the furnace is also to be achieved. For this purpose, the roasting room is very spacious in relation to the amount of material blown in, the furnace diameter preferably being greater than its height. The EI blowing device directed towards the middle of the furnace is dimensioned so that only a jet that is fine in relation to the size of the furnace chamber is blown in. An agitator is also arranged at the bottom of the chamber. The injector used to blow in the material is expediently directed upwards at a small angle to the horizontal. A drying chamber is provided above the roasting chamber through which the gases from the roasting chimney can be passed through.

Further details of the invention are described below.

'Through the discovery is achieved. That’s the one at the top Oven blown-in good components can separate far from each other, so that they are surrounded only by gas on all sides. There is also a vortex the atmosphere in the main part of the furnace chamber is avoided. whereby the good constituents can sink evenly downwards. Since they practically travel the same way, a product of very high uniformity is achieved. Through this kind of The introduction of the goods also prevents them from sticking to the oven walls. , ' By Utilizing the excess heat of the roasting chamber to dry the goods is the Increased economic efficiency of the process. When using the oven for roasting Ore containing zinc and iron sulfides becomes complex zinc-iron compounds only formed in small quantities.

The exhaust gases from the drying and roasting chamber can optionally be in the roasting chamber can be returned, whereby a extensive regulation the oven temperature and the concentration of the Röstkaminergase can be achieved.

In the drawing, an embodiment of the invention is for example shown schematically.

The cylindrical furnace i has an upper hearth 2, which is expediently designed in the form of a vault and is closely connected to the insulating cover 7 of the shaft 4 by means of a sealing ring 39. Four coverable openings are made in ihin, of which two, 3, 3, are arranged at regular intervals do the vertical shaft 4. At a certain distance below the hearth 2, a second, also arched hearth 5 is arranged, which by means of a sealing ring 40 against the shaft q. is sealed. Below it is the roasting chamber 8 with a large transverse and relatively large height, so that the finely distributed ore particles blown into the upper part of the chamber have enough time to be completely roasted while they are sinking. The roasting chamber should generally have a diameter of about 7.0 m and a height of about 4.5 inches.

The bottom of the Kaieiner S is formed by the arched hearth 9. Below (fiesem is the arched hearth II, the middle opening 12 of which is sealed against the cladding 7 of the shaft: (by a sealing ring, I1 and a sand barrier 38.

A pipe i3 connected to the outer periphery of the cooker 9 and an ani Outer circumference of the stove i r connected pipe 14 lead to a collecting container 15th

A line 16 leads from the outer circumference of the stove 5 to a comminution unit 17. An elevator in the sense leads the material from the comminution unit to a funnel 19 which is arranged above the oven roasting chamber 8 .

The injection pipe 2o is from the side of the furnace to the center and inclined directed upwards and arranged so that it is roughly parallel to the underside of the Cooker 5 blows out. The line 20 is in communication with a fan 21, whose Inlet 22 with an air supply line 23 and rides a line 24 in connection represents which with the upper part of the arranged between the flocks, -> and 5 Drying chamber 25 is connected.

The chewer 26 arranged between the herds 9 and i i stands by a smoke duct 27 with the gas cooler and -flash collector 28 in connection, while a line 29 in front of the radiator 28 leads to the fan inlet 22.

In the air line 23 there is a cock 231, in the line 2d. a rooster 241, and a tap 291 is arranged in the gas line 29.

From the funnel i9 a line 3o leads downwards to an air injector 31, which brings the pulverized ore into the line 2o.

A line 32 'connected to the upper part of the chamber 8 connects the chamber finite of the drying chamber 25 arranged between the stoves 2 and 5) and leads hot gases from the roasting chamber S into the drying chamber 25.

Attachment arms 33 and 3: 1 are attached to the shaft above the herds 2 and 9. These agitator arms are designed in such a way that they move when the shaft rotates (read Gut inwards convey to openings 3 and io. The also on the shaft q. attached stirring and discharge arms 35 and 36 move the material falling through the openings 3 and 10 over the herd 5 and i i to the outside.

During the operation of the oven, (read finely divided goods, which usually in the form of sulphide, when it was damp, it was applied to the uppermost hearth and here (for those coming from chamber 8 (for line 32 into chamber 25 hot gases dried.

The product is moved to the openings 3 by the discharge cord 33 and falls through this onto the stove 5. Move the stirring arms 35 (read Gut over the heated hearth 5 to the outside, and the finally dried material is through the Line 16 is fed to the comminution unit 17.

The gases supplied through the line 32 and resulting from the drying of the material in the chamber 25 are sucked off by the blower 12 through the line 2. These gases are mixed with the desired amount of air regulated by the line 23 and the tap 231 and pressed into the line 2o, which blows out into the upper part of the roasting chamber 8. At the same time, the device 31 introduces the desired amount of fine, pulverized, dried material into the air-gas flow in the injection device 2o, which is fed from the comminuting mechanism 17 via the Elevator 18, hopper i9 and line 30 is fed.

The mixture thus blown into the chamber is burned and held maintain a temperature sufficient to properly roast the sulphide particles to effect.

The diameter of the roasting chamber 8 is so with the injection power coordinated so that the blown-in good components can spread widely, so that the individual particles are completely separated from one another and out of touch sink down together. A stir in the main part of the Roasting chamber is avoided, so that a particularly long, intensive and even roasting is achieved without slagging of the side walls occurs. Since a complete Oxidation is achieved, a large amount of heat occurs, so that the supply of special fuel is not required.

The roasted product that is deposited on the stove g, is preferably by means of the device 34 through the opening io through to the stove ii led; from where it is by means of the device 36 through the line 14 into the storage container 15 is brought.

If the goods are to be removed quickly from the furnace, then by changing The material movement of the agitator arm 34 is also discharged through the line 13.

The main part of the combustion gases in the chamber 8 passes through the Outlet line 27 at the bottom of the furnace and is passed through dust collectors, crushing devices or centrifugal separators cleaned of dust particles.

The gas becomes sulfur dioxide when it is required for further processing d concentration has, removed from the chamber 28. However, the gas is not high concentrated enough that it can be returned to the furnace by opening the tap 291 will.

This arrangement is very advantageous; by adjusting the air cock 231 and the gas tap 291, the amount of air and gas can be regulated so that the Combustion temperature can be precisely adjusted within the roasting chamber.

If the gas escaping from the roasting chamber has too high a temperature so it can be passed through heat exchangers to it before returning enters the roasting chamber to bring it to the desired temperature.

The air valve 231 regulates the fresh air to be added to the mixture to be injected. In this way a complete oxidation of the property can be achieved. The air supply can also be regulated so that the exhaust gases have an excess of oxygen.

Due to the possibility of precise temperature setting within In the chamber 8, the roasting can be carried out at 212 to 4 times the normal throughput will.

When roasting sulphides containing zinc and iron, it is desirable to achieve the highest possible amount of zinc oxide. The zinc is supposed to be electrolytic Ways are gained, so one is already during the roasting for the formation of zinc sulphate care for. This is achieved with the furnace according to the invention by precise setting the speed of the discharge sarine. the longer the roasted in the upper part of the oven Good remains in the lower part of the furnace, the greater the zinc stilfate formation.

Claims (4)

PATENT CLAIM: i. Roasting oven, in the upper part of which is finely divided Ore is injected by means of a single injector, indicated by a spacious furnace chamber with a height of preferably 4.5 m and a diameter of preferably 7 ni and an insertion opening arranged in the upper part of the side wall for the injector directed towards the furnace axis, which feeds the material into the furnace chamber blows that it is spread throughout the upper part of this room and without The furnace atmosphere is swirled through a lot, slowly sinks to the bottom. 2. Roasting oven according to claim i, characterized .ge characterized, claß the injector under a small Angle to the horizontal is directed obliquely upwards. 3. Roasting oven according to claim i and 2, characterized. claß the Gutaustragleitung (16) one above the Roasting oven arranged drying chamber (25) to a comminution device (17) and this is connected to the injector for (las fine I: rz (2o). 4. Roasting oven according to claim i to 3, ge = characterized by individually controllable connections of the Outlet (24) from the drying chamber (25), the dust separator (-8) for the out Your roasting oven discharged gas and a fresh air supply line (23) with that in the injection line for the fine ore switched on fan (21).