WO2020260561A1

WO2020260561A1 - Method for measuring a magnetic property of spongy iron

Info

Publication number: WO2020260561A1
Application number: PCT/EP2020/067992
Authority: WO
Inventors: Daniel Wöckinger; Thomas BÜRGLER; Franz Hauzenberger; Robert Millner; Gerald Rosenfellner; Gerd Bramerdorfer
Original assignee: Primetals Technologies Austria GmbH
Priority date: 2019-06-27
Filing date: 2020-06-26
Publication date: 2020-12-30
Also published as: EP3757233A1; AT526499B1; AT526499A5

Abstract

Method for obtaining at least one item of information from the group - information relating to the content of ferromagnetic iron, - information relating to the degree of metallization, - information relating to the carbon content, concerning a spongy iron (3) that has been produced by means of a direct reduction process carried out in a direct reduction reactor (1). It comprises at least one measurement of at least one magnetic property at a temperature of the spongy iron (3) below the Curie temperature of elemental iron, and obtaining the information at least partly on the basis of the result of the measurement. The measurement is performed in each case on a measurement amount of the spongy iron (3) which is based on a measurement-material sample taken from the direct reduction reactor (1) after the direct reduction process has been carried out or on a measurement-material sample taken from a stream of material discharged from the direct reduction reactor (1) after the direct reduction process has been carried out or which is in the stream of material during the measurement.

Description

description

Title of the invention

Method for measuring a magnetic property of sponge iron

Field of technology

The invention relates to a method for obtaining at least one piece of information about a sponge iron, which is carried out by means of a in a direct reduction reactor

Direct reduction process was produced, with the information obtained from the group

- information on the content of ferromagnetic iron,

- information on the degree of metallization,

- information on carbon content,

originates.

State of the art

It is known to produce sponge iron by means of a direct reduction process in a direct reduction reactor. To the

To be able to determine the iron content of sponge iron in the direct reduction reactor during the direct reduction process is known from DE3017001A1, with the aid of coils

Information on properties of the sponge iron im

Direct reduction reactor - for example its magnetic permeability or its electrical conductivity - to win.

The disadvantage with regard to magnetic properties is that only at temperatures below the Curie temperature of iron useful information about iron content can be obtained; during the direct reduction process in

In the direct reduction reactor, however, the temperature is usually higher. The measurement of the electrical conductivity in turn works in principle at such high temperatures, but then only provides relatively imprecise results.

Summary of the invention

Technical task

It is the object of the invention to provide a method for obtaining at least one piece of information about an item carried out in a direct reduction reactor

Sponge iron produced by the direct reduction process, to introduce the extraction of more precise information from the group

- information on the content of ferromagnetic iron,

- information on the degree of metallization,

- information on carbon content,

enables.

Technical solution

This task is solved by a

Method for obtaining at least one piece of information

from the group

- information on the content of ferromagnetic iron,

- information on the degree of metallization,

- information on carbon content,

via a sponge iron, which by means of one in one

Direct reduction reactor carried out

Direct reduction process was produced, which is characterized in that it

- at least one measurement of at least one magnetic

Property at a temperature of the sponge iron below the Curie temperature of elemental iron,

- Obtaining the information at least partially based on the result of the measurement,

includes.

The measurement is in each case on a measured amount of the

Made of sponge iron. Meets the measurement crowd

at least one member of the group

- The measurement amount is based at least in part on one after the direct reduction process has been carried out

taken from the direct reduction reactor

Measuring material sample,

- the measurement quantity is based at least in part on a sample of measurement material taken from a material stream discharged from the direct reduction reactor after the direct reduction process has been carried out,

- the measured amount of sponge iron is during the

Measurement in the material flow,

to.

Advantageous Effects of the Invention

With the method various information about a sponge iron, which by means of an in one

Direct reduction reactor carried out

Direct reduction process was produced can be obtained. It is, for example, information relating to

Ferromagnetic iron content. It is, for example, information relating to

Degree of metallization.

In the context of this application, sponge iron is to be understood as a product of direct reduction with a

Ratio of mass percent Fe ₃ C cementite to mass percent metallic iron less than 50%, preferably less than 30%.

It is, for example, information relating to

Carbon content. Since magnetic properties are measured or recorded, the measurement or recording only provides information about carbon that is present with iron in a compound exhibiting the magnetic property.

Magnetic properties are properties that make that

Describe behavior in relation to a magnetic field.

According to the invention, at least one measurement of at least one magnetic property, for example the magnetic permeability, at a temperature of the sponge iron

below the Curie temperature of elemental iron

carried out; elemental iron is ferromagnetic below its Curie temperature. Others in sponge iron

possibly present substances such as

Cementite have their own Curie temperature.

One or more magnetic properties can be measured.

One measurement or several measurements can be carried out.

The desired information is at least partially based on the result of the measurement or measurements

won. For example, by measuring the

magnetic permeability information regarding the content of win ferromagnetic iron or degree of metallization or carbon content. The information can be an indication of the actual amount of substance present if all particles of the substance are from the

Measurement methods can be recorded - for example in the case of the substance metallic iron. If the measuring method cannot record all the particles of a substance, the measurement provides information about the amount of substance in the substance that can be detected - for example, as stated above with regard to information regarding the substance carbon; only the carbon is recorded which is present with iron in a compound which has the measured magnetic property under the conditions of the measurement - for example cementite Fe ₃ C.

The desired information is either obtained only on the basis of the result of the measurement or measurements, or it is obtained with the help of additional information - for example with the help of information about the temperature at which the measurement is made.

To carry out the direct reduction process,

Reducing gas in an apparatus, the so-called

Direct reduction reactor, initiated. in the

The direct reduction process is carried out in the direct reduction reactor.

The measurement is in each case on a measured amount of the

Made of sponge iron. The measurement amount can - at least partially - on one after the implementation of the

Direct reduction process based on sample material taken from the direct reduction reactor. The measurement amount can be based - at least in part - on a measurement material sample which is taken from a material flow discharged from the direct reduction reactor after the direct reduction process has been carried out. Under the phrase “based at least partially "is to be understood here that the measurement set consists entirely of a subset or the entire

Measurement material sample can exist, or can also contain other components in addition to the partial amount or the entire measurement material sample, for example

Thinners.

During the measurement, the measured amount of sponge iron can also be in the material flow discharged from the direct reduction reactor after the direct reduction process has been carried out, that is to say without taking a sample of the material to be measured

be measured. This can be done, for example, by taking the measurement on a part of the system that conducts the flow of material, with the part of the system either not

Has an influence on the measurement - for example, a

Pipe section on which the measurement is carried out must be made of non-magnetic material - or its influence is known and can therefore be removed from the result of the measurement. The system part can, for example, be a seal leg, a discharge chamber, chutes or lines for conveying material into the discharge chamber or from the discharge chamber to compacting devices.

The measurement quantity is based at least in part on an after implementation of the

Direct reduction process taken from the direct reduction reactor sample material sample to understand that for the sponge iron removed from the direct reduction reactor, the direct reduction process in full

Direct reduction reactor has expired; this sponge iron is a product of direct reduction with a ratio of mass percent Fe ₃ C cementite to mass percent metallic iron of less than 50%, preferably less than 30%. Below the Curie temperature of elemental iron

Measurement data obtained for the magnetic property have a particularly precise relation to the desired information about the sponge iron, so that from the measured magnetic property or from the measured magnetic

Properties the information can be obtained more precisely than is currently possible in the state of the art DE3017001A1. In addition, such a measurement is with a

Sample temperature, which is significantly lower than the temperature in the direct reduction reactor, is easier to handle - which increases the reproducibility of the process

For example, information regarding

Degree of metallization can be obtained as follows on the basis of a measurement, similar to ISO 11258:

M [%] = 100 * m _FeM / m _FeT

M is the degree of metallization of the measured quantity in

Mass percentage. m _FeM is the mass of metallic iron present in the measured quantity. According to HOT BRIQUETTED IRON (HBI) QUALITY ASSESSMENT GUIDE, International Iron Metallics Association August 2018, metallic iron is iron in non-oxidized form with an oxidation number of 0. Elemental iron and the iron content in compounds in which iron is present

Oxidation number 0 is present - for example iron in cementite Fe ₃ C; the iron content in compounds that have metal-like properties, such as iron in

Cementite, is referred to as metallic iron in the context of this application - are referred to as metallic iron in the context of this application.

m _FeT is the mass of the total iron contained in the _measured quantity; "Total iron", T stands for total. According to HOT BRIQUETTED IRON (HBI) QUALITY ASSESSMENT GUIDE, International Iron Metallics Association August 2018, Total iron includes everything Iron in any form, whether free or combined with other elements such as oxygen.

A calculation example: m _FeM = 90 g, m _FeT = 100 g

M = 90%

The definition also applies accordingly when using information on mass percentages (m-%) with regard to the measured quantity:

M [%] = 100 * m _FeM / m _FeT

Sample calculation:

m _FeM = 90 m-%, m _FeT = 95 m-%: M = 94.7%;

Here, m _{FeM is,} for example, via measurements

ferromagnetic properties, such as the

Permeability gained. The product of one

Direct reduction process has practically only

ferromagnetic metallic iron, since, for example, ferromagnetic magnetite Fe ₃ O _{4 has} already been completely or practically completely reduced to non-ferromagnetic wustite (FeO) or metallic iron. The

The total _{iron content} m _FeT can usually not be determined directly via ferromagnetic properties, but m _FeT and thus the metallization can, for example, with the help of the chemical analysis of the _starting materials for the

Direct reduction process can be determined. Another

The possibility is to set m _FeT to a typical constant value as an approximation.

Example for the determination of m _FeT with the help of the chemical analysis of the _input materials:

Input material:

m _FeT ^E = = 67 m-%,

m _gait ^E = mass fraction of gait = 5 m-%. The gangue is rock that does not contain any iron compounds. The superscript E denotes parameters for the input material magnetic measurement: m _FeM = 90 m-%

The total _{iron content} m _FeT is then calculated using a

Balance sheet. If only iron ore reduction is taken into account, use the following equation:

(m _FeM + (m _FeT - m _FeM ) * mm _FeO / mm _Fe + m _FeT * m _gait ^E / m _FeT ^E ) = 100 m-% m _FeM , m _FeT in m-%,

mm _Fe or mm _FeO : atomic mass of iron Fe

or molecular mass of Wüstit FeO,

mm _Fe = 56 g / mol, mm _FeO = 72 g / mol

Solving the above equation gives: m _FeT = 92.4 m-%, and thus the metallization M is calculated as 97.4%

According to a preferred embodiment, the method also comprises

at least one detection of at least one magnetic

Property at a temperature of the sponge iron above the Curie temperature of elemental iron,

wherein the detection is carried out in each case on a detection set of the sponge iron, with at least one member of the group on the detection set

- The acquisition amount is based at least partially on a during and / or after the implementation of the

Direct reduction process

taken from the direct reduction reactor

Acquisition material sample,

- the detection amount is based at least partially on a detection material sample taken from a material flow discharged from the direct reduction reactor after the direct reduction process has been carried out,

- the amount of sponge iron to be detected is in the material flow during detection,

applies,

and the results of the acquisition are at least partially included in the extraction of the information. With regard to the acquisition amount, it is based at least in part on one after the implementation of the

Direct reduction process taken from the direct reduction reactor sampling material to understand that for the sponge iron removed from the direct reduction reactor already fully the direct reduction process in

Direct reduction reactor has expired; this sponge iron is a product of direct reduction with a ratio of mass percent Fe ₃ C cementite to mass percent metallic iron of less than 50%, preferably less than 30%.

The terms measurement and detection as used in claims 1 and 2 cited above are synonymous. That regarding claim 1 regarding measurement, measurement amount and

Measurement material sample What has been said applies accordingly to

Detection, detection amount and detection material sample in claim 2. The detection relates to a temperature of the sponge iron above the Curie temperature of

elemental iron while measuring on a

Refers to the temperature of the sponge iron below the Curie temperature of elemental iron.

Above the Curie temperature of elemental iron, elemental iron or iron compounds are not ferromagnetic, but paramagnetic. During the detection, any substances that may be present are detected that are ferromagnetic, but not elemental iron or

Are iron compounds. A correction factor for results of the measurement can thus be determined from the detection, which indicates the extent to which the result of the measurement cannot be caused by iron or iron compounds.

The measurement material sample and the acquisition material sample can be the same - the acquisition material sample can also be can be used as sample material or vice versa. In this way, the effort for taking samples is reduced.

The measurement amount and the detection amount can be the same

- The acquisition quantity can also be used as a measurement quantity

used or vice versa. In this way, the effort for measuring or recording is reduced.

The measuring material sample and / or the

Acquisition material sample before the measurement and / or the

Acquisition of at least one conditioning step from the group

- sighting,

- wind sifting,

- crushing,

- sieving,

- Compression, subject.

By means of these measures, a more homogeneous measurement quantity, possibly with little gap volume, can be obtained, which improves the accuracy or reproducibility of the

Measurement or detection increased.

The comminution is preferably carried out in an inert atmosphere in order to change the chemical composition,

for example through oxidation - which reduces the risk of falsifying measurement data on the magnetic property of the sample. Preferably, the mass of the measured quantity and / or the

Determined collection amount. This can increase the accuracy or reproducibility of the measurement or detection. This can be done before the measurement or acquisition, or after the measurement or acquisition.

Preferably before the measurement

- the one removed from the direct reduction reactor

Measurement material sample during and / or after removal, and / or

- the measuring material sample taken from the material flow during and / or after the removal,

and or

- the measured amount of sponge iron,

cooled to a temperature below the Curie temperature of elemental iron.

By active cooling, preferably to a desired one

Final temperature, the speed of the process and the reproducibility of the measurement are increased.

This cooling to a temperature below the Curie temperature of elemental iron takes place when the

Source of the material sample or the measured quantity

Temperature above this Curie temperature.

With regard to the at least one measurement at a temperature below the Curie temperature of elemental iron, at least two measurements are preferably carried out. At a temperature below the Curie temperature of elemental iron, at least a first measurement is made at a temperature above the Curie temperature

ferromagnetic iron compound, preferably cementite Fe ₃ C, carried out, and at least one further measurement below the Curie temperature of this iron compound was carried out. In this way information can be given about amount of this Iron compound, and in the case of cementite as above

explained about the carbon content, are obtained,

In principle, further measurements can also be carried out, each of which is carried out after cooling under Curie temperatures of other components of the measured quantity.

After the first measurement, the measurement amount is preferably set to a temperature below the Curie temperature

Iron compound cooled. Active cooling, preferably to a desired final temperature, increases the speed of the process and the reproducibility of the measurement.

According to an advantageous variant

to obtain the information

at least two results from at least one member of the group

- Measurement

- capture

be mathematically linked. That makes the won

Information more accurate than if only one result is used to obtain it.

For example, the information about the

Carbon content in the measurement amount by the following

Link gained:

In order to be able to measure the carbon content using magnetic methods, the carbon must be present in a ferromagnetic compound, for example cementite Fe ₃ C, so you can only measure the correspondingly bound carbon.

Under the permissible neglect of others

For ferromagnetic substances, the Fe ₃ C example results in the following formula: m _gebC = mass or mass fraction or mass percentage (m-%) of bound carbon in the measured amount

m _{geb C} = [m _FeM (T <T Fe 3C) ^_ m _FeM (T Fe 3C <T <T Fe)] * mm _C / (3 * mm _Fe ) ·

In this case, m _{FeM (T <TFe3c)} refers to an amount of metallic iron resulting from the measurement signal of a measurement at a temperature T below the Curie temperature of cementite TFe ₃ C. The measurement signal for metallic iron comes from elemental iron as well as from iron in the form of cementite Fe ₃ C below the authorized level

Assumption that none or practically no others

ferromagnetic components are present in this temperature range.

m _{FeM (TFe3C <T <TFe)} refers to an amount of elemental iron below the authorized amount resulting from the measurement signal of a measurement at a temperature T below the Curie temperature of elemental iron and above the Curie temperature of cementite TFe ₃ C Assumption that no or

practically no other ferromagnetic components are present in this temperature range. mm _c or mm _Fe : atomic mass of carbon C

or of iron Fe

mm _c = 12 g / mol, mm _Fe = 56 g / mol,

Sample calculation:

With crowds

m _{FeM (T <T Fe 3 C)} = 70 g,

m _{FeM (T Fe 3 C <T <T Fe)} = 9 0 g

m _gebC = (90 - 70) g * (12/168) = 1.43 g,

or with m-% m

m _{FeM (T <TFe3C)} = 70 m-%, m _{FeM (TFe3C <T <TFe)} = 90-m-%

m _gebC = (90 - 70) m -% * (12/168) = 1.43 m-% The measurement and / or the acquisition, preferably also the acquisition of the information, is preferably carried out in an automated manner. This speeds up the process and reduces the effort required to carry it out.

The measurement and / or the acquisition and / or the acquisition of the information is preferably carried out continuously or quasi-continuously. It is under continuously

preferably to understand that an existing device for taking the measurement material sample and / or

The sample of acquisition material runs continuously and a measurement or recording takes place at least once every 30 minutes. In this context, quasi-continuous is preferably to be understood as meaning that an existing device for taking the measurement material sample and / or

The sample of the acquisition material runs discontinuously and a measurement or acquisition takes place at least once every 30 minutes. This allows quick information about the properties of the sponge iron and subsequently enables any necessary information to be taken quickly

Corrective action in the direct reduction process.

Another subject matter of the present application is a direct reduction process which is regulated at least partially on the basis of information obtained according to the invention.

The regulation is either only based on the

information obtained according to the invention, or it is obtained with the help of additional information - for example with the help of information about the state of the reduction reactor or about the quality of the raw materials used. Another object of the present application is a signal processing device with a machine-readable program code, characterized in that it contains control commands for controlling an inventive

Has direct reduction process.

Another subject matter of the present application is a machine-readable program code for a signal processing device according to the invention, characterized in that the program code has control commands which the

Trigger signal processing device to regulate.

Another subject matter of the present application is a storage medium with a stored on it

machine-readable program code according to the invention.

Brief description of the drawings

In the figures, variants of the

Method according to the invention shown schematically as an example.

Figure 1 shows an embodiment with removal of a

Measuring material sample.

FIG. 2 shows another embodiment with taking a sample of the acquisition material.

FIG. 3 shows an embodiment in which the measured amount of sponge iron is in the material flow during the measurement.

Description of the embodiments

Examples In Figure 1, a direct reduction reactor 1 is shown, in which a direct reduction process for the production of

Sponge iron is carried out. Reducing gas 2 is introduced into the direct reduction reactor and reduces the iron oxide-containing material contained in it, with sponge iron 3 being formed. A sponge iron sample to be measured is taken via a removal device 4 - for example a

Screw conveyor - taken from the direct reduction reactor 1 after the direct reduction process in

Direct reduction reactor was carried out. The material sample taken is sieved 5, if necessary before or after a comminution and / or air sifting, not shown separately for the sake of clarity,

conditioned and by means of a transport device 6 - for example as shown schematically

Screw conveyor; but the transport is also by means of

Rotary valves, conveyor belts, scraper conveyors,

Shut-off valves with gravity material transport or the like possible - to a measuring device 7

transported. The measurement of the magnetic property is made on a measurement amount based on the so

conditioned material sample based. So that the measurement takes place at a temperature of the sponge iron below the Curie temperature of elemental iron, the

The measuring material sample is cooled to a temperature below the Curie temperature of iron when it is removed.

It would also be possible to cool in the transport device 6. After the measurement, the mass of the measured quantity is determined, which is not shown separately for better clarity. The measured amount is a serving of the

Sample of material to be measured in the measuring chamber of the

Measuring device 7 is located. The measurement amount can be how

is shown by way of example, be part of a material column which is located in a pipe connection 8 on which the Measurement is performed. The pipe connection 8 is in

Area of the measuring device made of non-magnetic material.

After the first measurement carried out by means of the measuring device 7, the sponge iron is fed to a further measuring device 10 by means of a cooling screw 9. It is cooled to a temperature below the Curie temperature of cementite. Cooled in this way, a second measurement is carried out in the same way as the first measurement.

The results of the first measurement and the second measurement are fed to an evaluation unit 11 in which the

desired information is obtained by mathematically linking the results; in the illustrated case one

Signal processing device with a machine-readable program code, with which the direct reduction process is regulated on the basis of the information obtained.

The measurements and the acquisition of the information take place automatically and continuously.

FIG. 2 shows another embodiment in a representation that is largely analogous to FIG. After the direct reduction process has been carried out, material is discharged from the direct reduction reactor 1 through the discharge line 11. A sample of the material to be captured is taken from the material flow in the discharge line 11 via the removal device 12, which is analogous to FIG

The measuring material sample of FIG. 1 is conditioned and fed to a detection device 14 via a transport device 13. The detection of the magnetic property is made on an amount of detection based on the conditioned sample of the detection material. The

Capture amount is one serving of

Sample of acquisition material located in the measuring chamber of the

Detection device 14 is located. As shown by way of example, the amount to be detected can be part of a column of material be located in a pipe connection 15 on which the measurement is carried out. The pipe connection 15 is made of non-magnetic material in the area of the detection device.

The detection amount when detected has a temperature above the Curie temperature of elemental iron; there is no cooling during the supply to the detection device 14. After the first measurement carried out by means of the detection device 14, the sponge iron is measured using a

Cooling screw 16 is fed to a measuring device 17. It is cooled to a temperature below the Curie temperature of elemental iron. Cooled in this way, a first measurement is carried out analogously to the description in FIG. 1. After the first measurement carried out by means of the measuring device 17, the sponge iron is fed to a further measuring device 19 by means of a cooling screw 18. It is cooled to a temperature below the Curie temperature of cementite. Cooled in this way, a second measurement is carried out in the same way as the first measurement.

The acquisition material sample also serves as a

Measuring material sample. After being transported into a measuring device, the quantity to be recorded can serve as a quantity to be measured.

The results of the acquisition, the first measurement and the second measurement are fed to an evaluation unit 20 in which the desired information is obtained through mathematical

Linking the results is obtained. The acquisition and the measurements and the acquisition of the information take place continuously and automatically.

To improve the filling of the measuring chambers of the detection device 14 and the measuring devices 17 and 19, slides 21, 22, 23 are provided below the measuring chambers 24, 25, 26, and a piston 27, 28, 29 for compressing the detection quantity, respectively the measurement amount

intended. FIG. 3 is largely more analogous to FIGS. 1 and 2

Schematic representation of how the measured amount of sponge iron changes during the measurement after the

Direct reduction process is diverted from the direct reduction reactor material flow. The measurement is carried out by means of the measuring device 30 on a pipe section 31 which conducts the material flow and which has no influence on the measurement because it is made of non-magnetic material

manufactured.

The description given so far is more advantageous

Refinements of the invention contain numerous features, some of which are summarized in several of the individual subclaims. These features can, however, expediently also be viewed individually and combined to form further useful combinations. In particular, these features can each be combined individually and in any suitable combination in a method according to the invention.

Even if in the description or in the claims some terms are used in the singular or in connection with a numerical word, the scope of the

Invention for these terms should not be restricted to the singular or the respective numeric word. Furthermore, the words "a" or "an" are not numerals, but rather

Understand indefinite articles.

The described properties, features and advantages of the invention and the manner in which they are achieved will become clearer and more clearly understood in connection with the description of the exemplary embodiment (s) of FIG

Invention, which are explained in more detail in connection with the drawings. The exemplary embodiment or exemplary embodiments serve or serve to explain the invention and do not restrict the invention to combinations of specified therein Characteristics, not even with regard to functional characteristics.

In addition, suitable characteristics of each

Embodiment also considered explicitly in isolation, removed from one embodiment, in another

Embodiment introduced to supplement it and combined with any of the claims.

Although the invention has been illustrated and described in more detail by the preferred exemplary embodiment (s), the invention is not restricted by the disclosed example (s) and other variations can be derived therefrom without departing from the scope of protection of the invention according to the claims.

List of reference symbols

1 direct reduction reactor

2 reducing gas

3 sponge iron

4 removal device

5 sieving

6 Transport device

7 measuring device

8 pipe connection

9 cooling screw

10 measuring device

11 Evaluation unit

12 extraction device

13 Transport device

14 Detection device

15 pipe connection

1 6 cooling screw

17 measuring device

1 8 cooling screw

1 9 measuring device

20 evaluation unit

21 slider

22 slider

23 slider

24 measuring chamber

25 measuring chamber

2 6 measuring chamber

27 pistons

2 8 pistons

2 9 pistons

30 measuring device

31 pipe section List of citations

Patent literature

DE3017001A1

Non-patent literature

ISO 11258

HOT BRIQUETTED IRON (HBI) QUALITY ASSESSMENT GUIDE, International Iron Metallics Association August 2018

Claims

Expectations

1. Method for obtaining at least one piece of information from the group

- information on the content of ferromagnetic iron,

- information on the degree of metallization,

- information on carbon content,

a sponge iron (3), which by means of an in one

Direct reduction reactor (1) carried out

Direct reduction process was produced, characterized in that it comprises

- at least one measurement of at least one magnetic

Property at a temperature of the sponge iron (3) below the Curie temperature of elemental iron,

wherein the measurement is based on a measurement amount of the

Sponge iron (3) is made, with the

Measure crowd at least one member of the group

removed from the direct reduction reactor (1)

Measuring material sample,

- the measured quantity is based at least in part on a material sample taken from a material stream removed from the direct reduction reactor (1) after the direct reduction process has been carried out,

- the measured amount of sponge iron (3) is in the material flow during the measurement,

applies.

2. The method of claim 1, characterized in that it also comprises

at least one detection of at least one magnetic

Property at a temperature of the sponge iron (3) above the Curie temperature of elemental iron,

wherein the detection is carried out in each case on a detection set of the sponge iron (3), with at least one member of the group on the detection set

Direct reduction process

removed from the direct reduction reactor (1)

Acquisition material sample,

- the amount to be detected is based at least in part on a sample of the material to be detected taken from a material stream discharged from the direct reduction reactor (1) after the direct reduction process has been carried out,

- the amount of sponge iron (3) to be detected is in the material flow during detection,

applies,

and the results of the acquisition are at least partially included in the extraction of the information.

3. The method according to claim 2, characterized in that the measurement material sample and the detection material sample

are the same.

4. The method according to any one of claims 2 to 3, characterized in that the measurement amount and the detection amount are the same.

5. The method according to any one of claims 1 to 4, characterized in that the measurement material sample and / or the

Acquisition material sample before the measurement and / or the Acquisition of at least one conditioning step from the group

- sighting,

- wind sifting,

- crushing,

- sieving,

- Compression, is subjected.

6. The method according to any one of claims 1 to 5, characterized in that the mass of the measurement quantity and / or the detection quantity is determined.

7. The method according to any one of claims 1 to 6, characterized in that before the measurement

- The one removed from the direct reduction reactor (1)

Measurement material sample during and / or after removal,

and or

- the measured amount of sponge iron,

is cooled to a temperature below the Curie temperature of elemental iron.

8. The method according to any one of claims 1 to 7, characterized in that at least two measurements are carried out, with at least one first measurement being carried out at a temperature above the Curie temperature of a ferromagnetic iron compound, preferably cementite Fe ₃ C, and at least one further Measurement below the Curie temperature of this iron compound is carried out.

9. The method according to claim 8, characterized in that the measured amount is cooled to a temperature below the Curie temperature of the iron compound after the first measurement.

10. The method according to any one of claims 1 to 9, characterized in that

to obtain the information

at least two results from at least one member of the group

- Measurement

- capture

be mathematically linked.

11. The method according to any one of claims 1 to 10, characterized in that

the measurement and / or the acquisition, preferably also the

The information is obtained automatically.

12. The method according to any one of claims 1 to 11, characterized in that

the measurement and / or the acquisition and / or the acquisition of the information takes place continuously or quasi-continuously.

13. Direct reduction process, characterized in that it is based at least partially on one of the

Claims 1 to 12 obtained information is regulated.

14. Signal processing device with a

Machine-readable program code, characterized in that it has control commands for controlling a direct reduction process according to Claim 13.

15. Machine-readable program code for a

Signal processing device according to Claim 14, characterized in that the program code has control commands which cause the signal processing device to regulate.

16. Storage medium with a stored on it

Machine-readable program code according to Claim 15.