DE1508037A1 - Method and device for the production of oxidized and reduced iron-containing spheres - Google Patents

Description

Patent attorney Wolter Meissner om ^ tng. Herbert Tischer

1 BBRUH 99, Hf * SfftT «T * AMC 33

mm * Memtmti «> 1 BEWJW 38 (GRUNEWALD), dti

Koka η Mining Co., Ltd,

and Vorriciakun «j for the production of oxidized and reduced iron-containing spheres.

The invention relates to a method and a device for producing oxidized and reduced spheres (hereinafter simply referred to as spheres) from iron products by burning fine, iron-containing powder in the form of grains (hereinafter referred to as green spheres). The above balls are made of suitable particle size of grains which are prepared by adding a small amount of a Zusatztiiiltele of 0.5 to 2 ^c ß> (bentonite or üalciumoxidpulver) an 'a powder of üisenerz (more than & 8Ο7 - 44 Ji!) Added, and Hüb Gemieoh is mixed with a suitable amount of water (7-18 ^) and then granulated into particles of a suitable size.The green spheres produced in this bead are converted into oxidized spheres by means of drying, preheating, burning and cooling or in reduced spheres by means of drying and preheating ,

Various processes for the production of oxidized and reduced spheres have already become known, in that such green spheres are treated in the catfish described, according to the invention, a novel process and device for the manufacture of such spheres is thus obtained dtr i'tohnik differentiates », ^ _{0 0RlGINAL}

000030/0107 " ² *

The task on which the invention is based consists in the creation of a method and a procedure for dividing spheres of the specified type, which is a unitary process ^. om. have and have excellent Ji ^ enaehaften, which are superior to those spheres after the other of the technology.

there is further subdivision on which the invention is based in that a method and a device of the specified Art zuia Manufacture wall hardening una uniform, (in eier Porin nox * malsieiJster) globules created wii "d, woflei die so-called green balls in a Urehofen without standstill during of drying, preheating, burning or keausierens ge-ι · ο11ΐ will.

iiine more of -li'rfiüung underlying On Gau ens distribution is that a "method and apparatus is provided of the λΤϊ specified, wherein the material introduced into Deia rotary kiln hardening and deberfiihren i * ³ undergoes the spherical form, and then such globules ( hereinafter referred to as dry balls) are sieved out, which have been dried and preheated, and then the dried balls are transferred on a sieve assembly into a rotary furnace, whereby the formation of rings of fire in the wall of the furnace is avoided.

According to the invention one proceeds in such a way that the dry Balls introduced into the rotary kiln with the addition of an additional mixer which improves the efficiency of the educational training will.

According to the invention, one continues to operate in such a way that the exhaust gas the reducing atmosphere emitted from the rotary kiln would be in the Dry and rotary kiln is returned and a secondary combustion of the Abgaeea by means of an auxiliary burner to carry out comes, ug such an oxidizing atmosphere in the tropical

909839/0607 - 3 -

BATH ORIGINAL

and Vorernitzun ^ rjdrehof en to train, so that this is possible v.ii .. 'u to use the ^ bgas in an economical way.

The Ac finding is explained below, for example, with reference to the attached drawings:

Fig. I is a partial view of an embodiment of the invention appropriate device "

Fig. 2 is by this device along the line λ-λ NaCN FIG an Querecnnitt. I ₀

FIG. 3 is a cross-section along the line B-B according to FIG. 2, with the illustrations partially cut away Fig. 4 shows a temperature curve of the green balls, which by a number of these components during drying, firing and ^ iOkuhlena kicking hindu and continuing to show a ten, temperature curve ■ his Gnses.

5 is a cross-section of an embodiment of the device for producing small spheres by means of direct induction, and is similar to the dex representation according to I ¹¹ Ig. Fig. 6 shows a temperature curve of the green spheres which pass through some of these components during preheating, hedging and cooling, and also shows a temperature curve for gas.

Fig. 7 shows a graph showing the relationship between the addition of a reduction agent and the reduction expressed as a percentage.
In FIG. 1, a feed device 1 for green balls is given, the embodiment of which is unimportant insofar as a correct feeding or introduction is possible. In other words, a hydrogenating feeding device of the high-quality type can be used here. A rotary dryer 2 is also provided, ie it can be a conventional rotary kiln.

909839/0507 " ⁴ "

. üiterhir; is a sieve arrangement 3 in the form of a drum and .Li, ÄD8ie.'a. intended. In the arrangement 4 there is a suitable 2if> _: which usually has a mesh size of 5 mm. This? Ar; cran u- · ^ is usually inclined towards the outlet of the rotary dryer. In this case it is also possible to provide this sieve arrangement on the floor. Furthermore, there is a rotary kiln 5 for firing of the usual embodiment, which can also be used for reducing. An arrangement of the same type as the one after is indicated by the addition symbol 6

A rotary cooler 7 in the form of the usual rotary kiln, a sieve arrangement 8, which is not essential for the embodiment, is also provided. The embodiment shown in the drawings is a drum screen and a scraper 9 is provided at the inlet of the pulp dryer 2. There are conveyor belts 10 and 11 located at the outlet of the connecting chamber, as explained below, and a burner 12 is located at one of the buses of the rotary kiln 13. A docking pin 14 and a dust removal chamber 14 and a connecting chamber 15 'are of conventional construction aaf, it being possible for each rotary oven to circulate, while an airtight connection between the dryer 2 and the oven 5 is present.

In general, an oven hood 16 is provided, which serves to connect the ovens 5 • f} d 7 to one another in an airtight and rotatable manner. First of all, they are produced by an appropriate device; Transferred green balls into the rotary dryer 2 by means of the feed device 1. The exhaust gas temperature at the inlet of this dryer amounts custody usually to 100 ^e C and at demAuelaß on 300-35O ⁰ O. The green balls are allowed at temperature reader etws? 0 minutes in the dryer so that

9 09839/0507 - 5 -

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.38 337

same getvucioiou, gwk ' ■■: ■' - u:,. i .-. l ': _; . '.: - ■■ - be led - künen. währanu as an ■>"'■■:■.;." - ·; ■':. ■ ..1, -v. -. <■ _ -. ■ ■ ■ -y: it ·: ^ .- ■■ · <;^-:;'-; ■ »TV · ii r c Ί ν ·· H Obi ^3!...' Fr] '' ■ n iCllS '^ iii S *" l ^ S'.l ^r' i) ^? ;. * - ■ ί; Γ: '^; ^ Γ "' - * Ü Γ OO '■", "' ·: '-' ν erfo3.gt constant; -ίη Aufacrila ^ en nergeete "^, * ~ ^ ff rMe griner; balls iij eir4öm feewieeeu AueoiKi) zerkieineri. wevuaiio" ^, 4 jj ^{s: r} "· - ©« Amount of the ao formed shredded ore can be passed through the sieving device 3 wserds ^ and. dieaea Lpt-i-'r, '' - "rrt f, ζϊζ ■■■ ',; The input material is supplied by means of a Treiiapor-baü.leB 10. Removing dea zericieinerxer. Ore in this way represents one of the features according to the invention, which makes it possible to prevent the formation of adhering maaee (hereinafter referred to as i'euerringe or iUnga leaned) on the wall of the furnace, which results in an improvement in the quality of the product «

It was not by means of the previously known procedures possible to prevent the formation of rings in the ovens, e.g. in the Allis Ghalraer process, the formation of such hinge considered to be the greatest disadvantage and a furnace gun is used exclusively for the purpose of avoiding such rings, which creates considerable labor costs. In contrast It succeeds by means of the method according to the invention and the device according to the invention to avoid such a ring formation.

Even if a small amount of neiohen still hung up clinging to the inlet for the Beaohiokung des Trookoera, However, they can be mechanically mediated by the scratch 9 removed at any time.

The green balls (referred to as dry lugela in the following) are _: dried in this white and "bgte ia4 b" reita to a 1 "temperature bie au about JÜO" O yorejrhit "t wordea)" iod, * e "the eodaJin Duroh the an or dn «ag 4 In dta ÄenoXen $ tlhart. The above η-

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_Vi ; "^; -.-Er .-- .Ά; .-. ■ .—: \ - -..- ν ι · β - · ■, i τ s. E ^r > £ ►it ^: -, ^ , 2θ ^ Ό en its extent ν .-. ·: Ri '^ tt ^ i ....... ":">: Tr .-' ·, - "... :: heated« un ^ exe - tiffiperauur uk u (h <IseschuJtiungsexnlajs aee furnace is conditionally increased by the exhaust gases to "edeir. time on 3? U-400 ° 0th Thus move die.in .." υ roles shore, introduced dry balls still below <üü are further preheated, hardened and brought to a standard size until they can be observed at a temperature of 1.150 -1200 ⁰ G adjacent to the burner.

The pebbles fired in this way are fired to 950-2D0 ° G at the time of discharge from the furnace, in which case they are converted into a form in which they can withstand the effects of impact. The beads are discharged from the furnace and transferred to a rotary cooler 7 through assembly 6 for further cooling. The hot air produced in this way, usually 400 to 50 ° E, can be used as secondary air for the burner of the Oiens.

The spheres are thus cooled to βΐννπ IQO ⁰ C by means of the rotary cooler 7. They are again guided through the sieve arrangement 8, and they are then fed to a corresponding hunting station. The small amount screened off in the sieve arrangement is fed to the starting material by means of a conveyor belt 11. The exhaust gases passing through the rotary kiln 5 and the rotary dryer a 2 are passed to a dust removal chamber and then to a chimney 13 and, if necessary, through a further grass treatment arrangement.

The connecting chamber 15 serves as a hood for the connecting part of the rotary chamber 5 of the rotary dryer 2, whereby entry into this connec tion part is prevented.

BATH ORIGINAL.

Since you experience a physical hardening and turning over of green balls in a Bormgrasse due to the circulation of the rotary kiln, while they are fixed in the rotary dryer, rotary kiln and rotary kiln, the balls have a uniform and uniform shape, ao that the amount of comminuted EiZy as it occurs at the sieve device of the connection container, is substantially reduced, and the properties of the spheres are greatly improved. Since the balls have been sufficiently preheated, hardened and already converted to a good standard size, due to the circulation of the rotary dryer, as well as the small parts have already been sieved, the firing of the balls in the rotary kiln can take place uniformly at a low temperature and result in a no formation of rings is caused by adherence to the furnace wall. The device according to the invention continues to work economically and the firing can be carried out at such a low temperature that not only magnetic iron ore but also hematite ore can easily be treated. -44 fi $ 5 t5f « about) can be produced, even without using an additional manual. Jü3 it is still possible to use a further type of cooler which differs from the one indicated by the reference symbol? remains within the limits specified above, by An Turning a long and large rotary kiln, a screening device can be placed directly on a part of the furnace body so that

_o a single rotary kiln at the same time as rotary dryer 2 and rotary

oo oven 5 can serve.

* ° FIG. 4 shows eß * perstur curves of the original material J _n and of the exhaust gas _r partially pricked air, by means of drying

<! and cooling the same, and awar regarding the rotary dryer, des Drehofens uöq dea Dr ^ nküJilers. This means that inventively

- θ BAD ORIGINAL

If there was a favorable utilization of the heat according to a corresponding favorable use

The following is an example of embodiment relating to in form vcs i'sinen isilohen present Hematitereee reproduced. at This example is the rotary kiln used for reduction purposes 3 tu long and has an inner diameter of 0.25 m. The rotary furnace used for preheating is 4 m long with an inner diameter of 0.25 m and has a slope of. It rotates one revolution per minute. (l) Components of the material and their Maeohen sizes. component

Fe FeO SiO, Al ₄ O ₈ OaO PS annealing loss

61.02 1.29 5.58 1.27 0 * 18 0.077 0.698 3.08

Mesh size

Size (/ i (+ 208 208-149 149-104 104-74 74-44 -44

Io 1.1 5.7 15.5 11.6 1Q7 55.4

3e (Feberführexi in globules.

The green balls are placed on a disk ball device manufactured.

The green balls contain 16.5% by weight of water. It is not an additive applied. The diameters of the green balls are available for use in high rotary kilns and a Example reproduced.

SIZE (mm) 20-15 15-10 10-5

1 » 13.0 83.0 4.0

The compressive strength of the green balls amounts to 2.4 kg / - _vo ball on average, and the drop strength amounts to

iö 15 times on average.

o remark! The compressive strength of grüntn balls lit "in transit% echaittewert of 10 green balls, and the Fallfeetigkeit nird

expressed by a value determined by the fall of the green Balls from: a height of 50 cm is obtained. - 9 -

BATH ORIGINAL

(3J Brori-π. ^Ί '.OtJUSv

The ifcrai ^ eL v'iru c;. ■ ο ... ::. · .: u - ") h ■:.! ■; '. <" Fc ^: ..' ^P: ■ rVs - ■■ .. -, 'nc :: "■. · > FIg, 4 vv-'liv ■> .: ".> Ο ■, ■> ■■ ... ■ .: ·. :: '.. ■. ':; ■: ■■.''<■,·; ■ ^u:. CL: ^j: .. "/ i" :, UII üwar b' l 3ine i highest voué ii5O ^c As a result of drying and cooling, there is practically no pressure or crushing of the original material, and also no formation of the whole; -in der Ofeijwsny ϊ eätge ^ 't: ollt * Li.3 Teai ^ eratureinatstellung could iu constantly be achieved. Furthermore, aioh the total amount of particulate! Ore in the dust removal chamber and in the sieve arrangement of the connecting chamber to only 0.5 ' (dried amount) in relation to the material originally introduced into the furnace,

(4) Components of the products (oxidized balls) and their physical tests.
Component ($)

Fe PeO SiO _a Al, O ₃ CaO P 3

0.22 0.079 0.012

63.69 2.70 6.92 1.36 Masohen size Size (mm) 15-10 10-5

¥> 85.3 14.7

Physical test:

apparent specific gravity

Rubble

4 » Water absorption

$ Porosity

Compressive strength

lallfeäigekelt

Percent reduction

strength according to the Linder method η naoh der Reduction 95

Pressure activity near the reduction

909839/0807

4th , 6 3 ,1 10 , 6 (50 152 (kg / ball oohe 100 74 (*)

~ 10 BATH ~

The. Compressive strength '"ircl determined by means of a 'si'O ^ 'ST-'iBB' bub Lö iOig®lcäeii _Φ Di. 8 tfsllÄ © ö" feigiEsi "fe wirö expressed as a percentage of the good BtUak-S; by filing the material in an amount of 5 kg aas a height tob 2 Bi, and - swa-r four times. The percentage of reduction is obtained by means of the conventional reduction test of iron ore (Akashiß method "of December 9, 1958). The strength is obtained by means of the Linder method obtained by rolling the material in an amount of 200 g in a Linder TestroasclEine 30 tons long and then determining the percentage of the damaged material by means of a 5 mm sieve in front of direction « Good quality beads are used. When transferring the globule it is not necessary to use any additives. Depending on the practical field of application, the addition of such an additive can also be dispensed with. Excellent for manufacturing

Neter beads can still have the grain size of the original Materials * amount to a rough size up to —44, ^ 1 = "55> 4S ^ ,,

The device shown in Pig. "3 'represents a modified embodiment of the jendgen after Mg" 1 represents _t where after, the direct reduction process is carried out. In this case, a supply pipe for the Reduktioaraittel T? And an auxiliary burner 18 at the Verbindungekämmer 1. In other respects, this device is constructed in exactly the same way as that according to Pig.

The reference lines 1 - 16 after the Pig. 3 show eutspreckende feil «d« i * device uuuih der Pig, I.

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. ~ ^xx ~ 1ÖUÖU37

First, the green balls are introduced into the oxidation and preheating rotary furnace 2 by means of the loading device 1, which can work horizontally (a tape feeder, eolena feeder, and vuration feeder device) in order to break the green balls due to impact avoid. The heat capacity is controlled so that the temperature of the exhaust gas at about 10O ⁰ C in the. Dust removal chamber 14 Üeg1 For this reason, no malfunction of the green balls occurs under normal working conditions. The introduced into the oxidation and Vorerhitzungsdrehofen · 2 green balls be completely desulfurized at a high temperature above about 60O ⁰ C after drying, preheating, curing and XJeberführen in Kügelohen. The green balls can then be introduced into the rotary furnace 5 for the purpose of reduction after passing through the sieve arrangement 3. The heat source of the rotary furnace 2 for oxidizing and preheating can be obtained by the combustion process of a secondary burner (auxiliary burner) 18 and by reduced gas which is emitted from the rotary furnace for the reduction purposes, so that an oxidizing atmosphere results inside the rotary furnace 2 .

The temperature inside the furnace can generally be determined in accordance with the required percentage of desulfurization, namely the content of sulfur in the original temperature. With regard to economic and labor conditions, the temperature of the exhaust gas in the IIRD Staubentfernungskamtner 14 at approximately 100 ⁰ C held tor this purpose is a long H? Oven generally preferred.

_ω If desulfurization of the green balls is necessary, bed »

v, the main purpose of the preheating furnace 2 is to

^ soak, pre-rhi "tiaen, soften and convert into spheres durchzttfuhren, if exhaust gas is used and therefore no work are required at high temperatures. So there is

- 12 -

It is not necessary to use a secondary burner. The sieve arrangement 3 is arranged at the outlet end of the YorerJaitzungsof ens and can be in the form of a drum sieve. The portions screened off by the screen arrangement are fed to the front of the conveyor belt 10 through the arrangement 4 of the connecting chamber 15. Because these fines are removed, it is possible to avoid the formation of rings in the adjoining rotary kiln for the reduction. A solid reducing agent is introduced into the reducing furnace through the charging pipe 4. The same is mixed directly with the dry spheres (generally over 600 ⁰ G) and the equipment is led down into the furnace, resulting in a very rapid reduction of the dry spheres. As they approach the main burner 12, the reduction becomes more and more more promoted.

In order to improve the mixing of the dry high temperature balls and the reducing agent, it is advisable to provide a height difference between the stones in the lower part of the reduction furnace. · The main amount of heat for the reduction is supplied by the main burner. D & the reducing agent in direct contact with the balls will support both volatile than the fixed "share of the reducing agent is very effective Weis'e the Reciuit- 'tion of dry balls.' - '■ The length of time and · temperature of the reduction and the amount an ", ^ reducing agent can be based on the required 'Percent- ^

to '

_{o the} rate of reduction "

oo Since the reduction can be carried out quickly in this way, co

^ * It is possible to use a reducing rotary kiln with a slightly shorter one

° to apply dimensions than is otherwise customary «, The Reduk-

^ a. tion temperature inside the furnace usually amounts to

60Q-a2O0 ° G. '-.-..-. . ■ - ■■■ -. '^;'V"■' ■■ '■'

* ■ · ■■ - ■ · ■ "■ ...; · - 13 -

In general, the main burner is operated with reducing Ji ¹ Ia en ram and the Ililfsbrenner with oxidizing flames. The purpose of the connecting karamer 15 is to connect the rotary kiln 2 and 5, so that a hermetic seal is required χβέ. Nevertheless, provisions can be made to the effect that air is supplied for the combustion in the auxiliary burner, depending on the requirements. Are Ita Following this, the reduced pellets the predetermined reduction * degree of the rotary cooler 7 supplied by the arrangement 6 »The reduced iron is abgekühlx to about 10O ⁰ O in a cooler and filtered out from the sieve arrangement 8, (drum screen), and that optionally at the The extent of the cooler, so that the fine line can be returned again by means of the conveyor belt 11. The purpose of the scraper 9 is to scrape off rings around the inlet of the pre-etching furnace 2 which, due to the originally moist material, are peeked out. The chimney 15 serves to remove the waste gas. The hood 16 serves as a connection between the cooler 7 and the reduction furnace 5. The figure 4 shows curves of the originally supplied material and the exhaust gas (partially preheated air) inside the oxidizing and preheating furnace, the reducing furnace and the cooler, starting from FIG From the introduction of the material to the formation of the end products, this means that, according to the invention, an "effective utilization of the energy used, Bn t- ^ sulphurisation and reduction is achieved. The above-described examples are characteristic of the invention Rotary kilns railBlnander in all Austrian; \ s ■■■■■■■ - ■ '

i "are connected. In this way we would see the green balls

The effect is caused by the circulation of the ovens des! Eroöknens ^ VorerJaitzens * Oxidation and Reduction Mfcteit üäI d # r percentage of clinker éöt «ild« e arsprang

will *** «& £! && ^ n? i» g «rt» The following are

BATH ORIGINAL ¹ ^ *

in. J ^ rozent given some results for the purpose of explanation, which. siah on shredded material with none than 5 ran deciduous, and in relation to the end products.

Oxidized pots reduced

a furnace more than 5 more than lü

several ovens under 0.5 under 1.0

Regarding the finished "" balls mic size dimensions of larger than 5 mm the following differences in quality result.

. . ■■■: ... - "'-" - ^"■■■; (jilinheiten: yo); ■■''■" ■ Total ... - Se metal iron ■ S.. ""

+ 5 ■ 90.5 89.2 '0.05'

-5 '75.7, _72.8. 1.34; ·

Thus, the troaentsatz of shredded fractions with less than 5 ram is significant when working with a plurality of _; Oefen is reduced, so that there is a corresponding improvement in quality »_-..--; -. . -. --.:- · ■

It is thus possible »reduced globules C-from griiaen Kmgelii i». In the following, the characteristic features of the form and method according to the invention are given, as they result from the Mg »1,. (1) A rotary oxidizing and heating furnace is provided which is equipped with an auxiliary gate 18 so that reduced exhaust gas is generally burned in the rotary kiln operating in a radiant manner, namely below forming an oxidizing a-fctaosphäre inside the east ^ ena. Aüfgruud dee interaction with d m of the furnace kai "? a Entschwefela, yorerhitzen ,. drying tüid eberfiütorea ¥ a« ^ rl elolieB the green balls carried

BATH

Furthermore, impurities other than sulfur can be removed in an oxidizing atmosphere at a high temperature. By keeping the temperature of the rear parts of the preheating furnace 2 at about 100 ⁰ O, it is possible to keep the heat loss caused by the exhaust gas as small as possible. In this way, the desulfurization in the preheating furnace is carried out effectively, and the exhaust gas utilization in aera primary furnace can be achieved in a satisfactory manner.

(2) There is a connection channel 15, and if required, one Hilxs burner 18 provided and the sieved out through the oiebanordnun.2, Crushed powder, which otherwise leads to the formation of rings in the reducing rotary furnace 5, is removed by means of the sieve arrangement 3 for the return to the starting material The desulfurized and strongly heated dry balls are put together bit a reducing agent in the reducing dren furnace introduced from a discharge pipe 4, and a suitable solvent may be added if necessary. Inside the Drehofen has a reducing atmosphere, so that a corresponding reducing reaction occurs. According to the invention it is possible to achieve a significant reduction in the amount otherwise in use To achieve the coming amount of reducing agent, as well as to work with a low Reductionstemperatür, so that a ring formation is largely avoided in the rotary kiln.

(3) The method according to the invention can also be used there, where large amounts of sulfur-containing green balls with a relative highly volatile reducing agents are treated for the purpose of producing reducing spheres.

In the following an embodiment is reproduced in the half a reduction in the material used for implementation. The reducing rotary kiln used here is 3 m long and has an inner diameter vpä Oj25 ta aaf "The preheating

909839/0507 bathroom

are oven-4 πι long and has an internal diameter of 0.25 m to _c In these furnaces, the inclination optionally set "the furnaces are operated at 0.25 to 1 revolution per minute ,,

Components of the green balls and their mesh size (fi) components

Fe FeO SiO ■ Al ₂ O ₃ OaO MgO S loss on ignition 52.18 28.16 5.60 2.83 3.55 0.46 0.1? 7.9

Mesh size (fo) 9 - 15 mm 100 $.

Components of the reducing agent and their mesh size ($) Components

Water ash volatile content solid carbon sulfur

3.80 25.30 7.20 63.70 0.30

Mesh size ( ^c / o)

3 - 1 mm. 1-149-149

71.0 18.5 10.5

Limestone components and their mesh size

GaO SiO ₃ Al ₂ O ₃ MgO mm 54.69 0.68 . ' 0.17 0.63 ,8th Mesh size (fo) ■ 3 * - 1 mm - 1 38 , 2 61

Fuel - propane gas (C ₃ H ₈ )

A reducing agent (natural coke) is used in an amount of approximately 30% of the green balls in the rotary reducing furnace and the starting ore in an amount of about 15 kg / h and limestone in an amount of approximately 5 $ for desulfurization in the preheating furnace introduced.

The temperature curves shown in FIG. 6 are obtained using the main burner and the auxiliary burner. The temperature the rear part of the preheating oven is slightly

909839/0507 ₁₇

BATH ORIGINAL

increases before, ie at about 200 ⁰ C ₀ The green balls remain in the preheating furnace for about 1.5 hours and the percentage of desulphurization of the same amounts to about 92 ^{in an oxidizing atmosphere:} / o ₀ The dry balls, on the other hand, remain about 1.5 Hours in the reducing rotary kiln, so that there is a rapid .Reduktion of the oxidizing iron in a reducing atmosphere, there is a percentage of
Reduction of about 70; / ^

7 shows an exemplary embodiment with the addition of a
Reducing agent and the percentage of! Reduction »

Ü! PL-; ng.

DipK-ing. H. table

909839/0507

Claims (4)

Claims 1. Process for the production of oxidized and reduced, ferrous Globules, characterized in that balls made from a fine powdery, iron-containing material in two separate work sexes one after the other It is subjected to drying and preheating without being circulated, and the resulting single material is sieved off and is fed back to the starting material, as well as the dry and pre-heated balls to the final firing process are supplied " 2. The method according to claim 1, characterized in that the balls after preheating a Sedukuionsniit- τ el is supplied before performing the burning process. 3. The method according to claim 2, characterized in that g e k e η η ζ e ic h net, that the during the burning process due to the addition reducing atmosphere emitted by reducing agents for a Secondary combustion of the drying and preheating stage with the formation of an oxidizing atmosphere in the same will. 4. Apparatus for performing the method according to the preceding Method claims, characterized in that that it has a horizontal cooling arrangement (l) for inserting green or unburned balls into Eorm of a vibrating conveyor, a triple dryer (2) in the form a rotary kiln, a sieve arrangement (3) in the form of an irommel 909839/0507 _ ρ - Siebes, one connection arrangement (4) with a lug size of about 5 mra in an inclined arrangement downward with respect to the outlet of the lreiitrocknei ⁱ s (2), followed by a kiln (5) in the form of a rotary kiln, then a connection arrangement ( 6) of the same type as the connection arrangement (4) »a rotary cooler (?) In the form of a conventional rotary kiln, a sieve arrangement (8) of any design, a scraper (9) on the outlet of the rotary dryer (2), and conveyor belts (10,11 ) at the outlet of a connecting chamber " 5 c device drawing net labeled in characterized according to claim 4 »that a burner (12) at the outlet of the furnace is positioned (5), and a dust removing chamber (14) is present, a furnace cover (16) for the air <| p. ^: ite φά rotatable connection of the ovens (5,7) provided i £ 909839/0507