Method of separation of the minerals

FIELD: mining industry; methods of dressing of the mineral resources.

SUBSTANCE: the invention pertaining to the field of the minerals dressing, in particular, to the methods of of the radiometric separation of the ores, and may be used for separation of the fluorescent minerals. In the process of separation of the minerals conduct transportation of the minerals in the form of the monolayer stream of the being separated material, its irradiation by the penetrating radiation, registration of the intensity of the luminescent emission of the mineral from the side opposite to the incident stream of the penetrating radiation, comparison of the intensity with the preset threshold value and the subsequent separation of the useful mineral according to the outcome of the comparison. Additionally conduct registration and storage of the intensity of the luminescence of the air and change the threshold value proportionally to received value of the luminescent emission of the air. Irradiation by the penetrating radiation conduct the incident stream with the width larger than the width of the stream of the separable material; the intensity of the air and the mineral luminescent emission is registered under the flat angle (180°) or the blunt angle concerning the incident stream of the penetrating radiation. At that the air luminescent intensity is registered beyond the limits of the width of the stream of the separable material, and the intensity of the luminescent emission of the mineral is registered within the limits of the width of the stream of the separable material in the zone of the material irradiation and-or behind it along the material motion. The invention ensures the increased selectivity and the self-acting maintenance of the level of the separation, that allows to exercise the process of the separation of the minerals more efficiently.

EFFECT: the invention ensures the increased selectivity and the self-acting maintenance of the level of the separation, that allows to exercise the process of the separation of the minerals more efficiently.

2 cl, 1 dwg

 

The invention relates to the field of mineral processing, and in particular to methods for radiometric separation of ores, and can be used for the separation of luminescent minerals such as diamonds.

Known method of separation of mineral raw materials, implemented in the device according to the patent of the Russian Federation 2219001 (IPC7VS 5/342, publ. BI No. 35, 2003)in which to improve the accuracy of measurement of the luminescence signal of the mineral and correction threshold separation due to more accurate measurement of the level of luminescence air threshold value of the luminescence intensity, measured and memorized signals luminescence of minerals and air, the luminescence signal of the air being summarized in the course signal threshold intensity voltage for automatic correction of the threshold separation, also fed into the unit of comparison for a selection of full signal luminescence of the luminescence signal of the mineral, the signals luminescence of minerals when entering luminescent minerals in the zone of irradiation and registration are compared with a given threshold separation, by comparing the results produced cutoff mineral in the concentrate.

The disadvantages of this method are the low selectivity of the separation and the impossibility of providing automatic maintenance level separation, which cannot be p is wycena due to the low selectivity because any luminescense mineral, the luminescence signal is above a predetermined threshold separation, will be recovered in the concentrate. Therefore, when the software automatically maintain a level of separation of the sensitivity of the separation process dramatically increases the output of the associated luminescent minerals in the concentrate, which significantly reduces the efficiency of the separation.

The known method for the separation of minerals, which consists in the transportation of minerals in the form of monosloevogo flux, irradiation of minerals penetrating radiation, reception light signal of luminescence by radiation and opposite irradiated, measuring the total intensity of the luminescence signal from the falling stream of penetrating radiation, comparing the total intensity of the luminescence signal of the mineral with the specified threshold value of the luminescence intensity and the Department of mineral on a result of comparison (RF patent No. 2170628, IPC7VS 5/342, publ. BI No. 20, 2001).

The method improves the efficiency of separation by increasing signal luminescence of minerals from subaluminous diamond, but has a low separation efficiency at high content associated luminescent minerals separated in the ore. This is because the intensity of luminescent radiation of the ri register from the falling stream of penetrating radiation associated luminescent minerals than the specified threshold luminescence.

The technical result of the invention is to improve the selectivity and automatic maintenance level separation for more efficient separation through the use of differences in the absorption coefficient of x-ray and optical radiation between diamond and related mineral and registration of short and long-term component of the luminescence of diamonds in the overlapping areas of the radiation and reception, and only long-term components of the luminescence of diamonds in disjoint areas of exposure and check the registration of luminescence intensity at an obtuse or expanded angle relative to the incident flux penetrating radiation, as well as maintaining a given level of separation by measuring the intensity of luminescence of the air outside the flow of the separated material.

This technical result is achieved by the fact that the implementation of the method of separation of minerals, including transportation of minerals in the form of monosloevogo flow of the separated material, irradiation of the separated material penetrating radiation, the registration of the intensity of the luminescence radiation of the mineral from the side opposite to the incident flux penetrating radiation, comparing it with a preset threshold value and subsequent separation of useful minerals on the comparison result, the additional register and remember the luminescence intensity of the air, change the threshold value in proportion to the value of the luminescence intensity of the air, while exposure to penetrating radiation to produce a falling stream width, the greater the width of the flow of the separated material, the intensity of luminescence of air and mineral register under deployed or obtuse angle relative to the incident flux penetrating radiation, and the intensity of luminescence of the air register outside the width of the flow of the separated material, and the intensity of the luminescence radiation of the mineral record within the width of the flow of the separated material. In addition, the intensity of the luminescence radiation of the mineral recorded in the exposure zone of the material and/or behind it in the direction of travel of the material.

The physical sense, formed the basis of this method is the following. Some minerals, including diamond, under the action of penetrating radiation (in this case x) lumines cent, i.e. lit. Associated minerals in the bulk of lumines cent over the surface, i.e. the x-ray radiation penetrates minerals at shallow depths (y related minerals absorb x-ray radiation by 90% or more, with an increase in the size of the accompanying mineral absorption x-ray irradiation is s increases), and under the action of x-ray fluorescent insignificant thickness of the upper layer mineral (converted to the falling stream of penetrating radiation), as well as accompanying y minerals are not transparent to optical radiation, the luminescence of minerals recorded from the side facing the flow of the incident penetrating radiation, maximum. When you increase the angle of the Desk against the flow of the incident penetrating radiation decreases visibility luminescense part of the surface of the mineral, and blunt or expanded coal registration of luminescence from a companion, optically opaque mineral luminescence intensity minimum, which significantly reduces the probability of detection associated mineral. As well as the luminescence of minor mineral (several times less, than at her Desk on the part irradiated by a flux of penetrating radiation), it is possible to improve the software automatically maintain a level of separation when the separation of diamonds.

At the same time, diamonds are transparent to x-rays and weaken it, depending on the size, but not more than 50%. With decreasing grain size diamond attenuation of x-rays decreases. Thus, under the action of x-ray radiation is of, incident on the diamond and passed through him, a fluorescent diamond on the surface facing the flow of the incident penetrating radiation in the crystal and the side opposite to the flux of incident penetrating radiation, as x-ray radiation passes through the crystal and exits from the opposite side relative to the flux of incident radiation. Therefore, for the diamond effective registration of luminescence from the side opposite to the incident flux penetrating radiation, as well as diamond, in the majority, is transparent to optical radiation, are also recorded and produced in the crystal and the luminescence of the surface facing the flow of the incident radiation.

When blunt or expanded coal registration luminescence intensity of luminescence from diamond practically does not differ from the intensity of its luminescence upon registration under smaller angles, and Desk side facing the incident radiation flux that ensures reliable detection of the diamond compared to concomitant luminescense mineral.

In addition, the luminescence of diamonds may consist of short components of the signal, which corresponds to the initial moment of change, the impact of penetrating radiation on the mineral (point of entry and exit of mineral p is the current penetrating radiation, the corresponding rapid flare-up and attenuation) and has a duration less than 1·10-5with, and long-term components of the luminescence signal, which has a duration of more than 0.5·10-3with, and its contribution to the total signal can be up to 30%. For some related luminescent minerals luminescence can be represented only by short component with a duration of less than 1·10-4with ; (zircon) or long - lasting more than 2·10-2with (limestone). Therefore, additional selection with the separation can be achieved through the registration of various components of the luminescence signal. So, for deposits with a high content of zircons during registration in non-overlapping fields (check-long components) will provide additional selectivity diamonds against the zircons. At the same time, for deposits with a high content of limestone additional selection may be provided at check-in intersecting narrow zones (registration short components luminescence), while minerals with a high content of limestone will not be able to flare up. This is possible when the reception intensity of the luminescence of minerals in the zone of irradiation of the material and/or behind it in the direction of travel of the material. So, in the presence of a large number of mi is the Eraly with a large time constant (calcite) in the area of the radiation signal from a mineral with a large time constant will not have time to reach values greater than the threshold, while for diamond it's value is more than the threshold that will ensure its recovery into the concentrate. If you have a large number of related minerals with a time constant of less than 0.2 MS (zircons) registration of luminescence intensity advantageous to perform for area radiation in the direction of travel. In this case, the signal from minerals with a "short" time constant time to reduce the intensity of luminescence to values less than the threshold, the signal from the diamond will retain a value greater than the threshold, which will allow it to extract to concentrate.

However, under the action of penetrating radiation lumines cent not only diamonds and related y minerals, but the air trapped in the excitation zone. Therefore, when registering the luminescence of diamonds and associated minerals in the overlapping areas of exposure and registration of luminescence air is interfering signal, since the signal of luminescence from the valuable mineral is necessary to register on the background interfering signal luminescence air. However, the luminescence signal of the air is proportional to the intensity of penetrating radiation, is typically used as the reference signal to maintain the sensitivity of the separator. To the luminescence signal of the air does not have a big impact on the luminescence signal floor is knowledge of the mineral, its value must be compared with the signal from subaluminous diamond. When this registration luminescence intensity of the air is in the area of the irradiation zone, but outside the width of the flow of the separated material.

Thus, using differences diamond and related minerals in transparency to x-ray and optical radiation, as well as differences in kinetic characteristics of luminescence, it is possible to provide the technical result of the way that are improving the selectivity and automatic maintenance level separation separation and completeness of extraction of useful component.

The method can be implemented by the device represented in the drawing.

The device comprises a hopper 1, the transporting mechanism 2 is designed to move minerals through the zone of irradiation and reception, a source 3 of penetrating radiation, a photodetector 4 for converting the luminescence intensity of the mineral and air into an electrical signal, block 5 signal processing luminescence of minerals designed to enhance and comparing the amplitude of the signal luminescence mineral with a given threshold separation and maintain a given level of separation block 6 registration and storage of the amplitude of the luminescence signal of the air, the actuator 7./p>

The photodetector 4 is connected to the first input unit 5, the signal processing luminescence of minerals and the input unit 6 registration and storage of the amplitude of the luminescence signal of the air, the output of which is connected with the second input unit 5, the signal processing luminescence of minerals, the output of which is connected to actuator 7.

The photodetector 4 is performed on the basis of the photomultiplier tube PMT-85 and chips 140 series. Unit 5 signal processing luminescence of minerals performed on the chips 140 and 176 episodes. Unit 6 registration and storage of the amplitude of the luminescence signal of the air performed on the chips 140 series.

The method is as follows

Monololy the flow of the separated material is transported from the hopper 1 transporting mechanism 2 and is irradiated with penetrating radiation source 3. The width of the flux penetrating radiation wider flow of the separated material. Y minerals that fall under the action of a stream of penetrating radiation, begin to luminesce (lit), as well as the width of the flux penetrating radiation wider flow of the separated material, under the influence of fluorescent air getting into the flow of penetrating radiation and is not blocked by a flow of the separated material. Check the signal intensity of the luminescence of air and is mineralov occurs using the photodetector 4, installed below the expanded or obtuse angle relative to the incident flux penetrating radiation source 3. It converts light signals luminescence air and minerals in electric, which are received at the first input unit 5, the signal processing luminescence of minerals and the input unit 6 registration and storage of the amplitude of the luminescence signal of the air. The intensity of the luminescence signal of the air, registered outside the flow of the separated material is constant and proportional to the intensity of the penetrating radiation source 3 and the sensitivity of the photodetector 4.

Comparison of the luminescence intensity of the mineral with the specified threshold value occurs in block 5 of the signal processing luminescence of minerals that enhance the luminescence signal of the mineral to the desired level and compares it with a predetermined threshold value, which is proportional to the intensity of the luminescence signal of the air coming from the output of the unit 6 to the second input unit 5. The separation of the useful mineral in the concentrate is in excess of the amplitude of the signal luminescence mineral predetermined threshold, the block 5 generates a signal to the actuator 7. However, after prolonged use, the devices appear destabilizing factors (aging, C is the pollution), which cause a decrease in the signal from luminescense mineral, i.e. the device does not ensure that a given level of separation. To resolve this contradiction registration and remembering the intensity of the air are fed to the second input unit 5 of the luminescence signal of the air, the intensity of which varies with the emergence of destabilizing factors, then you can change the threshold value in proportion to the value of the luminescence intensity of air that provides automatic maintaining the level of separation.

The proposed method can more effectively perform the separation of minerals by increasing the selectivity of the process and provide automatic level maintaining separation and recovery of diamonds.

1. The method of separation of minerals, including transportation of minerals in the form of monosloevogo flow of the separated material, irradiation of the separated material penetrating radiation, the registration of the intensity of the luminescence radiation of the mineral from the side opposite to the incident flux penetrating radiation, comparing it with a preset threshold value and subsequent separation of useful minerals on the result of the comparison, wherein the implement additional re is istratio and remember the luminescence intensity of the air, change the threshold value in proportion to the value of the luminescence intensity of the air, while exposure to penetrating radiation to produce a falling stream width, the greater the width of the flow of the separated material, the intensity of luminescence of air and mineral register under deployed or obtuse angle relative to the incident flux penetrating radiation, and the intensity of luminescence of the air register outside the width of the flow of the separated material, and the intensity of the luminescence radiation of the mineral record within the width of the flow of the separated material.

2. The method according to claim 1, characterized in that the intensity of the luminescence radiation of the mineral recorded in the exposure zone of the material and/or behind it in the direction of travel of the material.



 

Same patents:

FIELD: enriching or classifying of materials.

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8 cl, 3 dwg

FIELD: woodworking industry; production of multilayer wood materials, plywood or layered materials.

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FIELD: jewel technology.

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FIELD: separating solid materials.

SUBSTANCE: method comprises processing the recorded luminescence signal from a mineral and separating the mineral to be enriched by comparing the signal with a specified threshold signal according to the separating criterion. For the separating criterion, a self-correlation function of the luminescence signal of the mineral is used.

EFFECT: enhanced quality of sorting.

8 cl, 3 dwg

FIELD: mining industry; minerals dressing and grading.

SUBSTANCE: the invention is pertaining to the field of upgrading and grading of minerals and may be used at dressing of the diamond-bearing ores and quality grading of the diamonds. The method provides for the optical rays irradiation of the minerals, registration of the scattered radiation in two spectral bands of the determined width, one of which contains the line of the Raman effect, the second band does not contain the line of the Raman effect, but envelops the first band from two sides, comparison of the signals in these two bands, identification and separation of the in compliance with the results of this comparison, in which the width of the spectral bands is regulated according to the condition: ▵ν10±δ,▵ν2= ν0±2δ-▵ν1, where: ▵ν1 - the bandwidth of the spectrum containing the line of the Raman effect;▵ν2 - the bandwidth of the spectrum, which does not contain the line of the Raman effect, but enveloping the first band from two sides; ν0 - the frequency of the maximum of the line of the Raman effect; δ - the band of the a frequencies of the selected line in the Raman effect spectrum. The device consists of: the storage hopper; the feeding mechanism; the source of the optical radiation; the inlet slit; the convergent lens; the dispersing component; the measuring channel with the outlet slit of the determined width, which outer surface is reflective; the reference channel receiving the light flux reflected from the outer surface of the exit slit of the measuring channel supplied with the outlet slit; imagers; the electronic unit; the executive actuating mechanism; recipients of the concentrate product and the tailings. At that the slits of the reference channel and the measuring channel are arranged coaxially and made adjustable. The technical result of the invention is the increased selectivity of the separation due to the more exact singling out of the Raman effect from the background noise.

EFFECT: the invention ensures the increased selectivity of the separation due to the more exact singling out of the Raman effect from the background noise.

3 cl, 5 dwg

FIELD: enriching or classifying of materials.

SUBSTANCE: method comprises transporting minerals as a multi-layered system, affecting the minerals by penetrating radiation that excites luminescence, recording light beam of luminescence from the side of penetrating radiation and from the opposite side, and separating the mineral comparing the results with a reference value. The transparency of mineral is additionally determined. The minerals are separated according their transparency to the penetrating radiation. The transparency of mineral is determined from the difference of logarithms or from the logarithm of the ratio of the light beams of mineral luminescence from the side of the exciting flux to that from the opposite side.

EFFECT: improved quality of separation.

2 cl, 3 dwg

FIELD: mining industry; methods of dressing of the mineral resources.

SUBSTANCE: the invention pertaining to the field of the minerals dressing, in particular, to the methods of of the radiometric separation of the ores, and may be used for separation of the fluorescent minerals. In the process of separation of the minerals conduct transportation of the minerals in the form of the monolayer stream of the being separated material, its irradiation by the penetrating radiation, registration of the intensity of the luminescent emission of the mineral from the side opposite to the incident stream of the penetrating radiation, comparison of the intensity with the preset threshold value and the subsequent separation of the useful mineral according to the outcome of the comparison. Additionally conduct registration and storage of the intensity of the luminescence of the air and change the threshold value proportionally to received value of the luminescent emission of the air. Irradiation by the penetrating radiation conduct the incident stream with the width larger than the width of the stream of the separable material; the intensity of the air and the mineral luminescent emission is registered under the flat angle (180°) or the blunt angle concerning the incident stream of the penetrating radiation. At that the air luminescent intensity is registered beyond the limits of the width of the stream of the separable material, and the intensity of the luminescent emission of the mineral is registered within the limits of the width of the stream of the separable material in the zone of the material irradiation and-or behind it along the material motion. The invention ensures the increased selectivity and the self-acting maintenance of the level of the separation, that allows to exercise the process of the separation of the minerals more efficiently.

EFFECT: the invention ensures the increased selectivity and the self-acting maintenance of the level of the separation, that allows to exercise the process of the separation of the minerals more efficiently.

2 cl, 1 dwg

FIELD: technological processes; mining.

SUBSTANCE: method involves exciting irradiation of minerals, luminescence filtration, registration of filtered luminescent light flux part and useful component separation according to a given light flux value. Light flux registration is performed in the zone of spectral luminescence density minimum of separated minerals. During light flux filtration blue-green spectral zone within the range of 450-550 nm is separated, e.g. through a couple of SZS-3 and SS-20 filters or interference filter with maximum permeability at 520-530 nm.

EFFECT: increased process selectivity.

3 cl, 9 dwg, 1 ex

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