# Thermal control method of grade of ore, and device for its implementation

FIELD: measurement equipment.

SUBSTANCE: invention refers to measurement equipment and can be used for automatic determination of metal concentration in ore. According to the method before control of grade of ore, ore passes through conveyor without metal impurities. For heating, area thermal source is used, which width does not exceed conveyor width. After time τ_{spec} when heating is finished, measured is average value of temperature based on heated surface of ore without metal T1_{av.} Based on these measurements, formed is calibration curve. Then ore containing metal is continuously supplied to conveyor and heated. After time τ_{spec} average value of temperature T_{avi} is measured on each i frame. Value T_{avi}-T_{1av} is determined based on calibration curve. Using value (T_{avi}-T_{1av}), determined is percentage of metal in ore. Besides, a device for implementation of the above method is proposed.

EFFECT: improving reliability of determination of metal concentration in ore.

6 cl, 7 dwg, 1 tbl

The technical field

The invention relates to the field of measurement technology and can be used to automatically determine the concentration of metal in ore mined on the basis of control of the distribution of temperature fields of ore in the process of moving the receptacles on the conveyor of the conveyor for processing.

The level of technology

An increasingly important role in modern industry play a metallurgical production, the main task of which is on the background of the depreciation of fixed assets in the production of metal with maximum performance and high efficiency.

In this regard, the increasing role play methods of increasing concentrations of ore before processing.

There is a method of determining the quantitative content of precious metals in rocks and piles of mining production (patent RF №2425363).

The method consists in the acid decomposition of the sample, separation, drying and fusing the insoluble residue with sodium peroxide, leaching obtained after fusing alloy 2 N. hydrochloric acid, the concentration of gold and platinum group elements (PGE) from the joint solution of complexing sorbent and analysis of suspension by the method of atomic absorption spectrometry.

This method has sufficient accuracy for determining the composition of the metal, but it is applicable that the are in the laboratory for sample analysis of ore.

Closest to the claimed method is thermal lumpy separation of raw materials (variants) and a device for its implementation (options) (patent RF №2326738).

This method consists in the following.

The piece containing the useful component and waste rock, is subjected to the irradiation of the electromagnetic field of ultra-high frequency (UHF) within a certain time with a certain frequency, fixed with the help of thermal systems thermal image after cessation of exposure and before or after the cessation of decay heat exchange processes between the components of the controlled piece, which determine the average temperature on mathematical dependencies determine the mass fraction of useful component in the piece, the volume ratio of the concentration of the useful component in the piece, coefficient of volume filling of the useful component, the results carry out the separation of raw materials to the threads.

The disadvantages of this method are the following:

1. Biological hazard to operating personnel in connection with the use of powerful microwave radiation.

2. The ability to control only a small amount of ore due to the limited size of the microwave antenna.

3. Low capacity control: the method is applicable for individual pieces of ore.

4. Difficulties in use in the PR the production due to the small performance control.

Therefore, today there is a need to create an improved method for controlling the metal content in the ore is free from the above shortcomings, which can be used in practice for various ores using a simple and accurate equipment.

Fundamentally the approach to the solution of such problems has become possible with the development of diagnostic tools, based on registration and analysis of the temperature fields of the surface of the test object. The most noticeable results have emerged in the last decade.

This is due to:

1. The advent of modern technology based on the use of portable thermal imaging equipment (e.g., O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002; Buddin O. N., Vavilov B. N., Abramova, E. C. Thermal control. Diagnostics security. Under the General editorship of academician Klyuyev centuries - M.: Publishing house of the Spectrum, 2011, 171 S.; Salikhov, Z., Buddin O. N., Ismestiev E. N. Engineering fundamentals of thermal control. The experience of industrial application): ID Misa, 2008, - 476 S.;

2. The creation of modern mathematical apparatus (ibid, allowing to solve direct and inverse problem of nonstationary heat transfer, which gave the possibility of moving from inspection (defect detection) to deflectometry (detection of internal defects, which determine their characteristics and residual life assessment of products).

There are repeated attempts to solve the above problem in different ways. However, this did not lead to the desired results. This is due to several causes.

1. The most known methods are based on chemical reactions, are used in laboratory conditions and are not applicable in real production conditions

2. Some methods are dangerous from the point of view of safety (use a sufficiently powerful microwave radiation), for the operator - the operator.

The invention

The problem to which the invention is directed, is to develop a method and device for determining the concentration of ore in the metal during the actual metallurgical production.

The technical result consists in ensuring the accurate determination of the content (concentration) of the metal in the ore is in the production environment (in the process of moving the ore on the conveyor of the conveyor).

Additional technical result consists in the automatic control of concentration of ore to ensure maximum efficiency of the smelting process.

The technical result is achieved due to the fact that in the method for determining the metal content in the ore, which consists in the fact that the ore is subjected to irradiation, register temperature field after termination of the irradiation and after the termination zatuchni the heat exchange processes between the components of the ore, determine the average temperature and then determine the metal content in the ore,

before carrying out inspection, the metal content in the ore on the conveyor belt miss ore without impurity metal (0% metal content),

in the process of moving its ore continuously heated power "P" areal source of heat (infrared) radiation, thus:

- the width of the source exceeds the width of the conveyor, which moves the ore,

- power radiation source P, the speed of travel of the conveyor belt "V" and the heating time t_{n}" connected by the relation of the optimal average temperature "T0_{cf}" heating the ore registered square with coordinates (x, y):

T0_{cf}=f(P, V, τ_{ass}, t_{n}),

where the functional dependence f(P, V, τ_{ass}, t_{n}) is determined based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. Simultaneously with the functional dependence in the calculation process was determined by the numerical values of the parameters: P, V, τ_{ass}, t_{n}.

In the described theoretical justification of the method used by the payroll program pointed to by the I above.

Thus, optimality "t0_{cf}" parameters of thermal excitation (P, V, τ_{ass}, t_{n}), should correspond to the dynamic temperature range thermal imaging system when it is configured before testing, and the maximum temperature of the ore on the conveyor.

Through time (τ_{ass}after heating to measure the average temperature of the heated surface ore containing metal (T1_{cf}).

Time τ_{ass}is determined using the above-mentioned literary sources of the conditions for heating the ore throughout the entire layer thickness with an error less than (δ). The definition of this quantity was conducted in accordance with the book of O. N. Buddin and other Thermal non-destructive testing products. M., Science, 2002, pp. 39-47.

On the basis of measurements form a calibration curve

Δ=f_{1}(T_{cf}-T1_{cf}), where

Δ - % of the metal content in the ore,

T_{cf}- the average surface temperature of the ore containing the metal (Δ· %).

The value of T_{cf}determined before carrying out inspection or experimentally on the basis of control of the calibration mixtures in accordance with subparagraph.2, 3 (calibration mixtures - mixtures with known metal content), or theoretically, based on the solution of non-stationary equation of Teplopribor the property.
In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. In the following theoretical and experimental substantiation of the proposed method was used for calculation program shown above.

Next on the conveyor is continuously supplied ore containing the metal.

Through time (τ_{ass}measure each frame (i) generated by the imaging apparatus, the average temperature T_{cpi}.

Measured value (T_{cpi}-T1_{cf}).

On the basis of the calibration curve, using the value of (T_{cpi}-T1_{cf}) determine the percentage of metal in the ore.

The technical result is reinforced by the fact that the registration of the temperature field of ore with metal carry out contactless using a thermal imaging system.

Spatial registration period the temperature field is determined by solving the system of equations:

where Δx_{DMP}, Δy_{DMP}geometrical dimensions of the temperature response from the minimum of the piece of ore.

The optimal interval of consecutive registration and analysis of the temperature field T(x, y)_{i}(τ) is determined by solving the equation

f(T) is the density distribution of the duration in remainingbalance signal

τ is the time interval measurements,

P - the probability of missing information signal,

T_{0}temporal resolution of the measuring sensors.

Additional technical result is achieved due to the fact that the range of sizes of pieces of ore, since the minimum size (Δ_{hdmp}, Δy_{DMP}), determined by solving the system of equations:

where

δ is the probability that (Δx_{subject}, Δy_{subject})≥(Δx_{DMP}, Δy_{DMP})

p(ΔX_{i}) is the distribution function values Δ_{subject}, Δy_{subject}.

The technical result in part of the device is ensured by the fact that the device for determining the metal content in p is de containing ore feed apparatus, a device for irradiation of ore, a logger and a computer device, means for supplying ore made in the form of a conveyor, a device for irradiation of ore made in the form of areal source of thermal radiation, however additionally introduced:

the gauge of speed of movement of the conveyor,

gauge the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system,

the sensor size of the areal source of thermal radiation,

the registration unit for the temperature field,

the power set operation modes,

the electronic unit definition T1_{cf},

microprocessor unit for constructing the calibration curve, the electronic unit definition T_{cpi},

the electronic unit determine the percentage of metal content in the ore, thermal imaging system, the sensor of the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system, the sensor size of the areal source of thermal radiation, the sensor of the speed of the belt, and the source of radiant heat is installed near a pipeline with the possibility of obtaining relevant information, and heating the ore, respectively,

the outputs of the sensor, R is stoane between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system, sensor size areal source of thermal radiation, speed sensor moving conveyor and a source of thermal radiation are connected respectively to the first to fourth inputs of microprocessor-based building block of the calibration curve,

the output of thermal imaging system is connected to the input of the recording unit of the temperature field,

the output of the registration unit of the temperature field is connected to the input of the power set operation modes,

the first output block set modes connected via the electronic unit definition T1_{cf}- for the fifth input of the microprocessor unit construction of the calibration curve,

the second output unit set modes of operation connected to the input of the electronic unit definition T_{cpi},

the output of the electronic unit definition T_{cpi}connected to the input of the electronic unit to determine the percentage of metal content in the ore, to the second input of which is connected to the output of the microprocessor unit construction of the calibration curve.

The essence of the invention and the possibility of achieving a technical result will be more clear from the following description with reference to the positions of the drawings, in which:

Fig.1 shows the structural diagram of the device

Fig 2 shows the graphs of the results of theoretical studies,

Fig.3 shows calibration curves,

Fig.4 p is eveden thermogram surface of the heated ore,

Fig.5 shows a calibration curve obtained from the results of experimental studies

Fig.6 shows a graph of the error in the determination of the metal content in the ore of the value of the metal content,

Fig.7 shows pictures of the heat controlling the concentration of metal ores.

In the above figures, the following notation:

1 - conveyor ore

2 - thermal imaging system,

3 - marketplace source of thermal radiation,

4 - speed sensor of coveyer,

5 - sensor distance,

6 - the sensor size of the heated area areal source of heat (infrared) radiation,

7 is a block registration

8 is an electronic block job mode (operation switch),

9 is an electronic block definition T1_{cf}(adder No. 1),

10 is a microprocessor unit for constructing the calibration curve,

11 - electronic unit definition T_{cpi}(adder No. 2),

12 - electronic unit of comparison is the determination of the percentage of metal content in the ore,

13 - thermal device controlling the concentration of metal ores, including blocks: 4-12.

P is the heating power,

V - speed of movement of the conveyor ore

L_{ass}- the distance between the end of heating and the registration of the temperature field,

T_{ass}the time of travel of the conveyor between the end of the of AREVA and check the temperature field,

L_{n}- the size of the heated area of the ore,

τ_{n}- move the conveyor in the area of the heated section.

The preferred embodiment of the invention

All the electronic components are built using standard microprocessor circuits and microprocessor Assembly with reprogrammable storage devices, and system management (disable/enable) system loading built on a standard relay systems (see, for example, Ugryumov E. P. Digital circuitry: educational. manual for schools. - 3rd ed. revised and enlarged extra - SPb.: - BHV-Petersburg, 2010). As the imaging device (2) used a thermal imaging company FLIR, IRTIS-2000 or similar technical characteristics. The method is as follows.

The impurity metal in the ore to increase the integral conductivity of the mixture of ore and metal (under the integral conductivity understand the average conductivity in the thickness of the mixture). Therefore, the heating temperature of the mixture will depend on the concentration of the metal. Thus, measuring the temperature of the surface and knowing the calibration curve (dependence of the temperature on the concentration of metal in the ore), the temperature value you can determine the value of the metal concentration.

The method is as follows

1. Before testing the soda is to maintain the metal in the ore on the conveyor belt miss ore without impurity metal (0% metal content).

2. In the process of moving its ore continuously heated power "P" areal source of heat (infrared) radiation, thus:

- the width of the source exceeds the width of the conveyor, which moves the ore,

- power radiation source P, the speed of travel of the conveyor belt "V" and the heating time t_{n}" connected by the relation of the optimal average temperature "T0_{cf}" heating the ore registered square with coordinates (x, y):

T0_{cp}=f(P, V, τ_{ass}, t_{n}),

where the functional dependence f(P, V, t_{n}) is determined based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. In the following theoretical and experimental justification of the method used calculation program shown above.

Thus, optimality "t0_{cf}" parameters of thermal excitation (R, V, τ_{ass}, t_{n}), should correspond to the dynamic temperature range thermal imaging system when it is configured before testing, and the maximum temperature of the ore on the conveyor, see the book of O. N. Buddin and other Heat is razrushayushie control products.
M., Nauka, 2002, where on page 68 of 87 detail the methodological aspects of choosing the optimal relations between the temperature controlled surface (in this case t0_{cf}") and parameters of technical facilities: characteristics thermal imaging equipment, the capacity of the heat source. This value is required for the correct choice of temperature range thermal imaging equipment.

3. Through time (τ_{ass}after heating to measure the average temperature of the heated surface ore containing metal (T1_{cf}).

τ_{ass}- the time interval between the end of heating and the time of registration of the temperature field.

This time interval is determined based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs.

4. On the basis of measurements form a calibration curve:

Δ=f_{1}(T_{cf}-T1_{cf}), where

Δ - % of the metal content in the ore,

T_{cf}- the average surface temperature of the ore containing the metal (Δ %).

The value of T_{cf}determined before carrying out inspection or experimentally based counter the La calibration mixtures in accordance with subparagraph.2,
3 (calibration mixtures - mixtures with known metal content), or theoretically, based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M, Science, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. In the following theoretical and experimental substantiation of the proposed method was used for calculation program shown above.

5. Next on the conveyor is continuously supplied ore containing the metal.

6. Through time (τ_{ass}measure each frame (i) the average value of the temperature T_{cpi}.

7. Determine the magnitude (T_{SPI}-T1_{cf}).

8. On the basis of the calibration curve, using the value of (T_{SPI}-T1_{cf}) determine the percentage of metal in the ore.

9. Check the temperature field design carry out contactless using a thermal imaging system.

10. Spatial registration period the temperature field is determined by solving the system of equations:

where Δx_{DMP}, Δy_{DMP}geometrical dimensions of the temperature response from the minimum of the piece of ore.

11. The optimal interval of consecutive registration and analysis of the temperature field T(x, y)_{i}(τ) is determined by solving the equation

f(T) is the density distribution of the duration in time of the information signal,

τ is the time interval measurements,

P - the probability of missing information signal,

T_{0}temporal resolution of the measuring sensors.

11. The range of sizes of pieces of ore since the minimum size (Δ_{hdmp}, Δy_{DMP}), determined by solving the system of equations:

where

δ is the probability that (Δx_{subject}, Δy_{subject})≥(Δx_{DMP}, Δy_{DMP}),

p(ΔX_{i}) is the distribution function of the values of Δx_{subject}, Δy_{subject}.

The technical result in part of the device is ensured by the fact that the device thermogravitational separation of raw materials (patent No. 2326738) is further provided with:

- areal source of heat (infrared) radiation power P 3,

sensor 4 speed V of movement of the conveyor 1,

- proximity sensor - L_{ass}=Vxτ_{ass}- 5 between the end of the heating area source of heat (infrared) radiation power "" 3, and the registration of the temperature field T(x, y) imaging system 2,

sensor size 6 areal source of heat (infrared) radiation:

L_{n}=Vxτ_{n},

the recording unit 7 temperature field T(x, y),

- unit 8 job modes,

- electronic unit 9 definitions T1_{cf},

- microprocessor unit 10 construction of the calibration curve,

- electronic unit 11 definition of T_{cpi},

- electronic unit comparing 12 - determine the percentage of metal content in the ore.

When the inputs of a thermal imaging system 1, proximity sensor - L_{ass}=Vxτ_{ass}with 5 sensor 6 size of the areal source of heat (infrared) radiation sensor 4 speed V of the moving conveyor and a source of heat (infrared) radiation 3 are associated with the conveyor, the outputs of the distance sensors - L_{ass}=Vxτ_{ass}5 areal size of the source of heat (infrared) radiation 6, the speed V of movement of the conveyor 4 and the source of heat (infrared) radiation 3 is connected, the COO is responsible,
1, 2, 3, 4 input unit 10, the output of the imaging system 2 is connected to the input of the recording unit 7 temperature field T(x, y), the output of the registration unit 7 temperature field T(x, y) is connected to the input unit 8 job modes, the 1st output block 8 set modes of operation connected to the input unit 9, 2nd output unit 8 is connected to the input unit 11 definition of T_{cpi}the output of block 9 is connected to the 5-th input of the microprocessor unit 10, the output of block 11 defining T_{cpi}connected to the input of the electronic unit comparing 12 - determine the percentage of metal in the ore to the second input of which is connected to the output of the microprocessor unit 10 build the calibration curve.

The device operates as follows.

At the first stage on the conveyor belt 1 is passed ore without admixture of metal. The conveyor moves at a speed "V". Carry out heating of the ore source 3 during the time τ_{n}" or at a distance "L_{n}". The heated area of the ore through time "τ_{ass}" or distance "L_{ass}" enters the field of view of the imaging system 2. Thermal imaging system 2 registers a temperature field T(x, y) within the field of vision through the block set 8 modes (switch) is supplied to the electronic unit 9 - adder, where the determination of the values T1_{cf}- the average temperature of the surface ore is without impurity metal in the area of field of view imaging system according to the formula

T1_{cp}=(1/N)ΣT(x, y)_{j},

where N is the number of measurement points of the temperature in the area of field of view,

j is the number of measurement points of the temperature in the area of field of view,

Σ is the sign of the amount.

The value of T1_{cf}from block 9 is transmitted to the microprocessor unit 10. Simultaneously, in block 10 receives signals from blocks: 4 - the amount of the movement of the conveyor, 5 - about the size of the distance - L_{ass}=Vxτ_{ass}6 - size of area source of heat (infrared) radiation, 3 - power heat source of the heat (infrared) radiation. In block 10 on the basis of available reference points T1_{cf}" on the basis of the mathematical models described in the above sources, is determined by the calibration curve, i.e. the dependence of

Δ=f_{1}(T_{cf}-T1_{cf}).

Here the value of T_{cf}adjusted with respect to T1_{cf}(i.e., when Δ=0) and next on the basis of mathematical models calculated with different values of Δ. Below in the section "research" will be given this dependency.

After determining the calibration curve of the unit 10 is transmitted to the electronic unit 12 comparison.

After determining the calibration curve unit 8 switches to the control mode. The value of T(x, y) of unit 7 enters the block 11 to the adder, where the determination of the values of T_{cpi}with a given period is according to the formula

T_{cpi}=(1/N)ΣZT(x, y)_{ji}.

The optimal interval of consecutive registration and analysis of the temperature field T(x, y)_{i}(τ) is determined by solving the equation

f(T) is the density distribution of the duration in time of the information signal,

τ is the time interval measurements,

P - the probability of missing information signal

T_{0}temporal resolution of the measuring sensors.

The value of T_{cpi}from the block 11 is passed to the block 12, where the computation of the values (T_{SPI}-T1_{cf}) and its comparison with the calibration curve. The result is determined by the amount of Δ - metal content in the ore, i.e., solves the problem posed in this patent - determination of metal content in the ore in a production environment.

The rationale of the proposed method was carried out theoretical way, and ek the pilot.

Consider theoretical research method.

On the basis of mathematical modeling methods described in literature

1. O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002.

2. Budden O. N., Vavilov B. N., Abramova, E. C. Thermal control. Diagnostics security. Under the General editorship of academician Klyuyev centuries - M.: Publishing house of the Spectrum, 2011, 171 S.

3. Salikhov, Z., Buddin O. N., Ismestiev E. N. Engineering fundamentals of thermal control. The experience of industrial application): ID Misa, 2008, - 476 S.

Mathematical model of thermal process control, used in the present invention.

On the basis of the mathematical model defined thermal control of ore.

In Fig.2, as an example, shows some graphs of the results of theoretical studies.

In Fig.3, as an example, some of calibration curves based on the results of theoretical research.

If we assume that the resolution of the temperature the ability of thermal imaging technology in a production environment is on average 0.5 deg, the results show that the method allows to determine the concentration of metal in the ore with an error of no more than 0.8%, which is sufficient for practical use.

Experimental studies of the wire which were in accordance with the above description. To simplify the experiment without compromising the accuracy of the obtained results of experimental studies were conducted on the fixed pipeline.

Procedure the experimental work was as follows.

On the surface of the poured ore without metal content. Then the ore was heated for 15°C infrared radiation power P=50 kW/m^{2}. 10-12°C were recorded temperature field. In Fig.4 shows thermogram of the ore without the metal content. The average surface temperature T1_{cf}=81°C.

Next, on the basis of this average temperature was determined calibration curve (Fig.5).

Later in the ore was mixed metal (from 1% to 10%) and record the surface temperature field and on the basis of the calibration curve was determined by the metal content in the ore and compared this set with the actual content. On the comparison of the determined relative error of the method (µ).

µ=|Δ-Δ_{0}|×100%/Δ_{0}here

Δ_{0}- the real metal content in the ore,

Δ - grade material, determined in accordance with the proposed method.

In Fig.6 shows a graph of the errors in the determination of the metal content in the ore of the value of the metal content.

It is evident from Fig.6 shows that the maximum error in the determination of metal content in the ore does not exceed 0,73%, which is completely otverzhdaetsya theoretical research.

Research results and comparison of experimental results with the method of control adopted as the closest analogue is given in table 1.

PM | Numerical and qualitative values of the parameter | |||

Invention | Prototype method | |||

2 | 3 | 4 | ||

The ability to control objects in real operational conditions | there | limited | ||

The need for special equipment | Equipment serial, no special requirements | Equipment is expensive, stationary, with biohazard | ||

Error | Not more than 0.80% | |||

Field of view | Real 2×2 m (limited by the geometric resolution of the equipment) | Limited area of a radiating antenna, really not more than 0.3×0.3 m | ||

The performance of the control | Not less than 3 m^{2}/S | Not defined |

The method has the following advantages:

- provides control in real operating conditions,

- allows to increase the reliability of testing results, approximately 3 to 10 times,

- allows to improve the reliability of operation of the control system,

- improves the efficiency of metallurgical processes.

1. Method for determination of metal content in the ore, which consists in the fact that the ore is subjected to irradiation, register temperature field after termination of the irradiation and after the cessation of decay heat exchange processes between the components of the ore, determine the average temperature and then determine the metal content in the ore, characterized in that

before carrying out inspection, the metal content in the ore through the pipeline p is lower ore without impurity metal,

in the process of moving its ore continuously heated power P areal source of thermal radiation, the width of which exceeds the width of the conveyor,

after a time τ_{ass}after heating to measure the average temperature of the heated surface ore containing metal (T1_{cf}),

on the basis of measurements form a calibration curve:

Δ=f_{1}(T_{cp}-T1_{cp}),

where Δ - % of the metal content in the ore, T_{cf}- the average surface temperature of the ore containing the metal (Δ %),

next on the conveyor continuously served ore containing the metal, heated power P,

after a time τ_{ass}measure each frame of the first video image of the temperature field average value of temperature T_{cpi},

determine the value of T_{cpi}-T1_{cf},

on the basis of the calibration curve, using the value of (T_{cpi}-T1_{cf}determine the percentage of metal in the ore.

2. The method according to p. 1, characterized in that the registration of the temperature field of ore with metal carry out contactless using a thermal imaging system.

3. The method according to p. 1, characterized in that the spatial period of the registration of the temperature field is determined by solving a system of equations:

where Δx_{DMP}, Δy_{DMP}geometrical dimensions of the temperature response from the minimum of the piece of ore.

4. The method according to p. 1, characterized in that the optimal interval between successive registration and analysis of the temperature field T(x, y)_{i}(τ) is determined by solving the equation