DK202200523A1 - Online and inline color control of processed material - Google Patents
Online and inline color control of processed material Download PDFInfo
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- DK202200523A1 DK202200523A1 DKPA202200523A DKPA202200523A DK202200523A1 DK 202200523 A1 DK202200523 A1 DK 202200523A1 DK PA202200523 A DKPA202200523 A DK PA202200523A DK PA202200523 A DKPA202200523 A DK PA202200523A DK 202200523 A1 DK202200523 A1 DK 202200523A1
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- 239000000463 material Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 claims abstract description 58
- 230000000694 effects Effects 0.000 claims abstract description 44
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000004886 process control Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000012883 sequential measurement Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 15
- 239000004927 clay Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 11
- 241000894007 species Species 0.000 description 11
- 238000001354 calcination Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052595 hematite Inorganic materials 0.000 description 4
- 239000011019 hematite Substances 0.000 description 4
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a method for monitoring a color of a processed material, such as a cementi-tious material, the method comprising the steps of passing at least a part of said processed material stream through a measuring zone within an electrical and/or magnetic field; introducing an effect to said electrical and/or magnetic field, said effect that can be measured depending on the nature of said processed material passing through said measuring zone and measuring a change in the effect caused by said processed material passing through said measuring zone.
Description
DK 2022 00523 A1
Online and inline color control of processed material
The invention relates to a method for monitoring a color of a processed material, such as a cementitious material in a plant for manufacture of processed material.
The clinker content of cement can be reduced by introduction of Supplementary
Cementitious Materials (SCM) to the cement formulation. Suitable SCM can be produced by calcination of clay or shale materials, which in addition to relevant clay minerals, typically also contains other iron containing mineralogical species.
During calcination, undesired side-reactions occur resulting in formation of red colored
Fe(lll) species, like hematite (Felll203). These red colored species result in a red colored — SCM product. A desired grey color can be obtained by suitable reduction of red colored
Fe(Ill) species to partially reduced Fe-species like magnetite(FellO-Felll203), ferrous oxide (FellO) and the like.
These processes are typically included in a clay calcination concept, which has been demonstrated to produce highly reactive SCM with suitable grey color. In order to have an overall energy-efficient process, it is desired to use the combustion air to cool the hot grey
SCM powder. This constitutes a challenge since the grey color, which is a result of partially reduced Fe-species might be compromised if these are in contact with an oxidizing atmosphere at elevated temperatures, resulting in re-oxidized red colored Fe(lll) species.
It is believed that if the cooling of the partially reduced iron species is done sufficiently fast to ‘compete’ with the reaction kinetics, then the re-oxidation can be limited. Thus, the cooling rate as well as the temperature to which the quenching is done are critical parameters for this to succeed. At industrial scale, this quench cooling is perceived to be done by introduction of a series of cooling cyclones, where the number of cyclone stages can vary from one to three.
The quench rate is achieved by mixing the warm color controlled SCM with a controlled flow of air in a riser pipe. The flow rate is kept constant in the test series, while the changes in temperature to which the quench cooling ends is achieved by preheating of the compressed air prior to contacting with the hot color controlled SCM.
Thus, in order to ensure appropriate quality of the calcined clay, it is relevant to establish an online analysis solution that can continuously monitor the color of the processed — material, e.g. after the cooling stages. Traditionally, this is achieved by establishing an online color measurement solution, which continuously measures the color of a representative part of the product stream. Though, color measurement at industrial conditions is a challenging task that requires delicate costly instrumentation and proper
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DK 2022 00523 A1 sample / material handling. Some of the color measurement challenges are described in the following.
Calcined clay is becoming an increasingly more interesting and sought-after
Supplementary Cementitious Material (SCM), because of both increased demand for SCM to reduce the clinker factor in cement, and due to anticipated lack of Fly Ash in the future as coal power plants are replaced by greener alternatives. Additionally, Ground
Granulated Blast Furnace Slag supplies are not expanding to meet the demand. As a result of the increased interest, the need to systematically test and evaluate calcined clays in a production environment is also increased. This is a first step towards identifying which parameters to use for quantification of the color of the clay after calcination.
Color is a key quality parameter in cement in many parts of the world and many applications. From white cement, rich in C3S and correspondingly high strength, to the belief in some countries that the darker the cement, the better it is, color plays an important role for the end users. Public appearance and cultural belief aside, the consistency of color is also critical for ready-mix- and concrete element manufacturers to ensure a sellable product with uniform appearance across many different concrete pours or element manufacturing cycles.
To ensure the success of calcined clay as an SCM, it is critical to be able to accurately monitor and control the color. This necessity is further enhanced as many calcined clays tend to become a strong reddish brown as a result of the oxidation of iron during the calcination process. Thus, an initial study was conducted to find the best method for quantifying this color, and, equally important, the color control process that aims to prevent this reddish-brown color in the end-product.
Color is measured routinely in the lab using a spectrophotometer. This is used for white cement plants to verify the “whiteness” of the cement produced, either in a customer cement, or in the burned raw mix prepared in the laboratory. The instrument measures the color of a sample by illuminating a plane surface and measuring the reflected light. This is correlated to white and black standards as well as knowledge of the wavelength spectrum of the emitted light. The returned parameters are the essential XYZ representing how the human eye perceives color. Many additional indices, defined and used in science or industry historically, can be returned by the software. Measuring the calcined clay is mostly trivial with this instrument; however, care must be taken when preparing the plane surface before measurement.
Fineness of the powder has influence, but also the evenness of the sample, the uniform distribution of different minerals in the sample and potential preferred orientation of platy mineral grains must be taken into consideration. For clays containing mica minerals, a special problem is present as micas are typically highly reflective, potentially leading to strange results when illuminated by the instrument. A problem may be to assess the importance of different related parameters. Most ways to represent a color are 3- dimensional, but not all are equally informative about the final color.
Additionally, the calcined clay in its pure form is rarely of interest. Instead, it is the color of the mixture with a cement that is relevant, and this presents another problem: How does the addition of calcined clay to a cement affect the cement color, and when will it affect too much to fail a quality parameter? One goal has been to try to define a single value that can be used for performance guarantees when discussing terms with end users. This comes
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DK 2022 00523 A1 with the increased problem that many different combinations of 3 values can be combined to achieve 1 single value.
In conclusion, clay calcination to produce SCM typically results in formation of undesired red colored hematite species from the iron species present in the feed materials. This is typically mitigated by partial reduction of the hematite species forming magnetite or other partially reduced iron species with dark/black colors.
A method for monitoring a color of a processed material, such as a cementitious material, in a plant for manufacture of processed material is desired.
Object of the invention
It is an object of the present invention to overcome or at least alleviate one or more of the above problems of the prior art and/or provide the consumer with a useful or commercial choice.
It’s a first object of the present invention to provide a proper operation of a color control unit of a SCM process as well as the possibility of diverting a product to in-spec or off-spec bins with a fast-reacting online/inline measuring device.
It is a second object of the present invention to provide a versatile concept that can easily be process-integrated in harsh environment with the opportunity to be cheaper as well as more robust and sensitive compared to alternative solutions.
It is a third object of the present invention to provide a method for monitoring a color of a processed material, such as a cementitious material in a plant for manufacture of processed material.
It is a fourth object of the present invention to provide an alternative to the prior art.
In a first aspect, the invention relates to a method for monitoring a color of a processed material, such as a cementitious material, the method comprising the steps of - passing at least a part of said processed material stream through a measuring zone within an electrical and/or magnetic field - introducing an effect to said electrical and/or magnetic field, said effect that can be measured depending on the nature of said processed material passing through said measuring zone, - measuring a change in the effect caused by said processed material passing through said measuring zone.
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DK 2022 00523 A1
The invention utilizes the change in magnetic properties associated with a change in redox state of the iron species to distinguish between hematite rich (off-colored red product) and magnetite rich (good colored grey product) by passing at least a part of the material stream through an electrical or magnetic field. Hereby an effect (current, voltage, magnetic field) will be induced that can be measured depending on the nature of the material passing the measuring zone.
The method may further comprise the step of comparing said change in effect with a pretermitted index for a color.
The method may further comprise the step of establishing a color index of said processed material based on the change in effect of said processed material.
The comparing of change in effect and establishment of color index is preferably performed by means of a separate measuring coil.
The processed material is preferably a cementitious material.
The introduced effect may be in the form of a current and/or voltage and/or magnetic field.
The method may further comprise the step of maintaining a temperature of said process material in the interval 25 to 850 °C, such as 50 — 400 °C, preferably 70 — 150 °C.
A measurement principle may be with parallel or sequential measurement of reference samples, so as to compensate for effects that might affect the measured change in effect.
The method may further comprise the step of connecting an output signal from said measurement of change in affect to a gate adapted to control a flow of said material to different downstream equipment, such as. in-spec and off-spec silos.
The method may further comprise the step of connecting said output signal to a process control loop, said process control loop adapted to increase a dosing of a reducing agent so as to achieve acceptable color of said process material or reduce said dosing if the color is above target.
The output signal may be connected to a process loop configured to regulate a quench cooling of the processed material.
The output signal may be adapted to be used as a contact-free flow-switch, since the intensity is depending on the filling degree as well as the velocity of the said materials.
The measurement of change in effect may be done continuously or intermittently.
The measurement of change in effect can be done continuously or intermittently depending on what is most suitable for the overall process. The continuous measuring provides the fastest response time, while a measuring solution where the sample is stationary during the measurement provides the highest accuracy since the material velocity effect is not present. Thus, continuously or intermittently can be chosen depending on the overall need.
The measurement may be conducted at different temperatures, i.e. at a suitable location in the process flow.
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The measurement may be conducted offline, online or inline or a combination of the beforementioned on a sample (stream) or an entire product stream.
The invention has the potential to combine an efficient inline analysis concept with data handling and process control.
A versatile concept that easily can be process-integrated in harsh environment with the opportunity to be cheaper as well as more robust and sensitive compared to alternative solutions. This a concept that to much greater extent can measure directly at different locations in the process. Furthermore, combining this with regulation loops etc. will increase the productivity of the method according to the present invention.
In a second aspect, the invention relates to an apparatus for monitoring a color of a processed material, such as cement, said apparatus comprising - a measuring zone arranged within an electrical and/or magnetic field - a power source adapted to apply said electrical and/or magnetic field - a measuring device adapted to measure a change in effect to said electrical and/or magnetic field, caused by said processed material passing through said measuring zone - said measuring zone being dimensioned so the processed material can be a solid with an average particle size ranging from 1 micron to 5 centimeters. - said processed material comprising at least 0.05% iron
In a third aspect, the invention relates to a color control unit, utilizing the method according to any of the embodiments in the first aspect of the invention.
The first, second and third aspects of the present invention may be combined.
The figures show one way of implementing the present invention and is not to be construed as being limiting to other possible embodiments falling within the scope of the attached claim set.
Embodiments of the invention, by way of example only, will be described with reference to the accompanying figures listed here:
Figure 1 schematically illustrates a block chart, comprising the steps of the method according to the present invention.
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Figure 2 schematically illustrates a simple embodiment of the present invention where the material to be measured is passed through the measurement zone resulting in a signal that correlates with the properties of the material.
Figure 3 schematically illustrates an embodiment of the present invention where the material to be measured is passed through the measurement zone resulting in a signal that correlates with the properties of the material. Furthermore, the measuring device comprises measurements of reference samples to compensate for effects that might affect the primary measuring values, e.g. voltage.
Figure 4 schematically illustrates an embodiment of the present invention where the material to be measured is passed through the measurement zone resulting in a suitable signal that correlates with the properties of the material. Furthermore, the measuring device comprises measurements of reference samples to compensate for effects that might affect the primary measuring values, e.g. voltage, The reference samples have been assigned relative color indices according to the degree of color control exerted.
Figure 5 schematically illustrates an embodiment of the present invention where the material to be measured is passed through the measurement zone resulting in a suitable signal that correlates with the properties of the material. Furthermore, the measuring device comprises measurements of reference samples to compensate for effects that might affect the primary measuring values, e.g. voltage, The reference samples have been chosen to reflect the optimal quality range of the given material whereby an improved control can be achieved.
Figure 6 schematically illustrates an embodiment of the present invention where the material to be measured is passed through the measurement zone resulting in a suitable signal that correlates with the properties of the material. Furthermore, the measuring device comprises measurements of reference samples to compensate for effects that might affect the primary measuring values, e.g. voltage, The different samples can be measured simultaneously, e.g. with electrical coils.
Figure 7 schematically illustrates a measuring zone according to the present invention.
Figure 8 schematically illustrates an apparatus for monitoring a color of a processed material according to the present invention.
Figure 1 discloses an embodiment of processing a clay mineral containing material into a supplementary cementitious material (SCM) including an indication of where a color measurement device could be placed. Furthermore, possible regulation or control loops are indicated by dotted lines to describe feedback as well as feed forward control loops for improved process performance. The calcined, color-controlled and at least partially cooled — material is passing through the color measurement device. The material sent through the measuring device can either be the full material stream or a suitable sub-stream of the product stream.
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Figure 2 discloses a schematic illustration of the measuring principle. The sample material to be analyzed enters the measuring zone resulting in a signal response, e.g. a voltage reading that can be converted to a color index number via calibration of the setup using relevant calibration standards of said material. In order to get a proper measurement, it is necessary to have a controlled measurement environment, e.g. temperature. Alternatively, measure the actual temperature and then compensate for the effects induced by difference in temperature between the different measurements.
Figure 3 discloses an improved embodiment of the measuring principle. Instead of compensating for variations in measuring environment with the aid of correlations, reference samples are placed in the same measuring environment as the sample to be measured. This provides an improved accuracy of the measuring since differences induced by variations in measuring environment are compensated directly since the references are placed in similar environment. Depending on the needed accuracy, a number of reference materials can be applied.
Figure 4 discloses a specific embodiment of the setup. Here, the reference samples included are the said material without color control, assigned Color Index = 0, and a perfectly color-controlled sample of the same material, assigned Color Index = 100. The sample to be measured is then measured in the same environment, and the result can immediately be converted to a color index number, typically in the range 0 — 100 and thereby provides insight into the efficiency of the color control part of the process and can be compared to the acceptable color index range for the given product. — Figure 5 discloses another specific embodiment of the setup. Here, the reference samples included is the said material without colors adjusted in such a way that they represent the ‘lower’ and ‘upper’ limits of the accepted color range for the said product. The sample to be measured is then measured in the same environment and the measurement can immediately be compared to the acceptance range and thereby determines whether the — color is in-spec or off-spec. If the nature of the raw clay changes significantly, or the acceptance criteria change, then the new reference samples can efficiently be included and thereby secure appropriate color acceptance criteria.
Figure 6 discloses an embodiment of the invention where the measuring is conducted by placing suitable reference samples and the sample to be analyzed in e.g., electric coils.
Hereby, an electric signal in the form of a voltage is produced, and the signal is depending on the color of the material placed within the measuring coils. The references and sample are placed in the same measuring environment to compensate for effects stemming from variations in measuring environment, e.g. temperature.
The method according to the invention comprises the steps of - passing at least a part of the processed material stream through a measuring zone 1 within an electrical and/or magnetic field - introducing an effect to the electrical and/or magnetic field; the effect can be measured depending on the nature of the processed material passing through the measuring zone 1,
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DK 2022 00523 A1 - measuring a change in the effect caused by the processed material passing through the measuring zone 1.
Figure 7 discloses a measuring zone 1 according to the present invention. The measuring zone is arranged within an electrical or magnetic field, which may be induced by a coil (not shown in figure 7).
The measuring zone can be arranged in a pipe, as illustrated in figure 8. Alternatively, the measuring zone can be placed across a conveyer belt.
Upon measuring of the change in effect, the system compares said change in effect with a pretermitted index for a color. This is subsequently used to establish a color index of said processed material based on the change in effect of said processed material.
The comparation of change in effect and establishment of color index is performed by means of a separate measuring coil.
The processed material is a cementitious material, such as calcined clay. — The introduced effect is in the form of a current or voltage or magnetic field or a combination.
The system maintains a temperature of the process material in the interval 25 to 850 °C, such as 50 — 400 °C, preferably 70 — 150 °C.
The measurement principle is performed with either parallel or sequential measurement of reference samples (to compensate for effects that might affect the measured change).
The system may connect an output signal from the measurement of change in affect to a gate adapted to control a flow of said material to different downstream equipment, such as in-spec and off-spec silos.
The system may connect the output signal to a process control loop. The process control loop is adapted to increase a dosing of a reducing agent so as to achieve acceptable color of the process material or reduce the dosing if the color is above target.
The output signal may be connected to a process loop configured to regulate a quench cooling of the processed material. — The output signal is adapted to be used as a contact-free flow-switch since the intensity is depending on the filling degree as well as the velocity of the said materials.
The measurement of change in effect can be done continuously or intermittently, depending on what is most suitable for the overall process. The continuous measuring — provides the fastest response time, while a measuring solution where the sample is stationary during the measurement provides the highest accuracy since the material velocity effect is not present. Thus, continuously or intermittently can be chosen depending on the overall need.
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The measurement can be conducted at different temperatures, i.e. at a suitable location in the process flow in the process flow as long as there is a suitable response signal. Hence the location is not limited to be located after the cooling section as indicated in the schematic illustration in figure 8.
The measurement can be conducted offline, online or inline or a combination of the beforementioned on a sample (stream) or an entire product stream.
Figure 8 illustrates an apparatus 2 according to the present invention. The apparatus comprises - a measuring zone 1 arranged within an electrical and/or magnetic field - a power source (not shown on figure 8) adapted to apply the electrical and/or magnetic field - a measuring device (not shown in figure 8) adapted to measure a change in effect to the electrical and/or magnetic field, caused by the processed material passing through the measuring zone - the measuring zone 1 being dimensioned so the processed material can be a solid with an average particle size ranging from 1 micron to 5 centimeters. - the processed material comprising at least 0.05% iron
The apparatus is also suitable for rotary kiln calcined and color-controlled clays where the particle size extends into the cm range.
In another embodiment, a color control unit may be adapted to perform the method according to present invention.
Although the present invention has been described in connection with the specified embodiments, it should not be construed as being in any way limited to the presented examples. It should also be understood that the form of this invention as shown is merely a preferred embodiment. Various changes may be made in the function and arrangement of parts; equivalent means may be substituted for those illustrated and described; and certain features may be used independently from others without departing from the spirit and scope of the invention as defined in the following claims.
List of references: 1: Measuring zone 2: Apparatus for monitoring a color of a processed material
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Claims (17)
1. A method for monitoring a color of a processed material, such as a cementitious material, the method comprising the steps of - passing at least a part of said processed material stream through a measuring zone (1) within an electrical and/or magnetic field - introducing an effect to said electrical and/or magnetic field, said effect that can be measured depending on the nature of said processed material passing through said measuring zone (1), - measuring a change in the effect caused by said processed material passing through said measuring zone (1).
2. A method according to claim 1, further comprising the step of comparing said change in effect with a pretermitted index for a color.
3. A method according to claim 2, further comprising the step of establishing a color index of said processed material based on the change in effect of said processed material.
4. A method according to claims 2 or 3, wherein said comparing of change in effect and establishment of color index is performed by means of a separate measuring coil.
5. A method according to any of the preceding claims, wherein said processed material is a cementitious material.
6. A method according to any of the preceding claims, wherein said introduced effect is in the form of a current and/or voltage and/or magnetic field.
7. A method according to any of the preceding claims, further comprising the step of maintaining a temperature of said process material in the interval 25 to 850 °C, such as 50 — 400 °C, preferably 70 — 150 °C.
8. A method according to any of the preceding claims, wherein a measurement principle is — with parallel or sequential measurement of reference samples.
9. A method according to any of the preceding claims, further comprising the step of connecting an output signal from said measurement of change in affect to a gate adapted — to control a flow of said material to different downstream equipment, such as in-spec and off-spec silos. Page 10 of 12
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10. A method according to claim 9, further comprising the step of connecting said output signal to a process control loop, said process control loop adapted to increase a dosing of a reducing agent so as to achieve acceptable color of said process material or reduce said dosing if the color is above target.
11. A method according to any of the preceding claims, wherein said output signal is connected to a process loop configured to regulate a quench cooling of said processed material.
12. A method according to claims 9 - 11, wherein said output signal is adapted to be used as a contact-free flow-switch.
13. A method according to any of the preceding claims, wherein said measurement of change in effect can be done continuously or intermittently. —
14. A method according to any of the preceding claims, wherein said measurement can be conducted at different temperatures, i.e. at a suitable location in the process flow.
15. A method according to any of the preceding claims, wherein said measurement can be conducted offline, online or inline or a combination of the beforementioned on a sample (stream) or an entire product stream.
16. An apparatus (2) for monitoring a color of a processed material, such as cement, said apparatus comprising - a measuring zone (1) arranged within an electrical and/or magnetic field - a power source adapted to apply said electrical and/or magnetic field - a measuring device adapted to measure a change in effect to said electrical and/or magnetic field, caused by said processed material passing through said measuring zone - said measuring zone (1) being dimensioned so the processed material can be a solid with an average particle size ranging from 1 micron to 5 centimeters. - said processed material comprising at least 0.05% iron
17. A color control unit, utilizing the method according to any of claims 1-15. Page 11 of 12
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA202200523A DK181382B1 (en) | 2022-06-02 | 2022-06-02 | A method and an apparatus for monitoring a color of a processed material and a color control unit, utilizing the method |
| PCT/IB2023/055630 WO2023233347A1 (en) | 2022-06-02 | 2023-06-01 | Online and inline color control of processed material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA202200523A DK181382B1 (en) | 2022-06-02 | 2022-06-02 | A method and an apparatus for monitoring a color of a processed material and a color control unit, utilizing the method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK181382B1 DK181382B1 (en) | 2023-09-20 |
| DK202200523A1 true DK202200523A1 (en) | 2023-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| DKPA202200523A DK181382B1 (en) | 2022-06-02 | 2022-06-02 | A method and an apparatus for monitoring a color of a processed material and a color control unit, utilizing the method |
Country Status (2)
| Country | Link |
|---|---|
| DK (1) | DK181382B1 (en) |
| WO (1) | WO2023233347A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3702133A (en) * | 1970-02-06 | 1972-11-07 | Lafarge Ciments Sa | Process and apparatus for magnetic separation |
| JPS52125338A (en) * | 1976-04-14 | 1977-10-21 | Hitachi Ltd | Deteceor for toner density |
| JPS5534655A (en) * | 1978-08-31 | 1980-03-11 | Sumitomo Metal Ind Ltd | Method and apparatus for measuring reduction powdering ratio of sintered ore |
| JPH02206756A (en) * | 1989-02-06 | 1990-08-16 | Nec Corp | Method and device for measuring quantity of cement in cement mixture |
| JPH10330856A (en) * | 1997-05-28 | 1998-12-15 | Nisshin Steel Co Ltd | Detection of iron content in water granulated slag |
-
2022
- 2022-06-02 DK DKPA202200523A patent/DK181382B1/en active IP Right Grant
-
2023
- 2023-06-01 WO PCT/IB2023/055630 patent/WO2023233347A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3702133A (en) * | 1970-02-06 | 1972-11-07 | Lafarge Ciments Sa | Process and apparatus for magnetic separation |
| JPS52125338A (en) * | 1976-04-14 | 1977-10-21 | Hitachi Ltd | Deteceor for toner density |
| JPS5534655A (en) * | 1978-08-31 | 1980-03-11 | Sumitomo Metal Ind Ltd | Method and apparatus for measuring reduction powdering ratio of sintered ore |
| JPH02206756A (en) * | 1989-02-06 | 1990-08-16 | Nec Corp | Method and device for measuring quantity of cement in cement mixture |
| JPH10330856A (en) * | 1997-05-28 | 1998-12-15 | Nisshin Steel Co Ltd | Detection of iron content in water granulated slag |
Also Published As
| Publication number | Publication date |
|---|---|
| DK181382B1 (en) | 2023-09-20 |
| WO2023233347A1 (en) | 2023-12-07 |
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