CN113933307A - Method for measuring dissociation characteristics of lamellar minerals and application - Google Patents
Method for measuring dissociation characteristics of lamellar minerals and application Download PDFInfo
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Abstract
The invention provides a method for measuring dissociation characteristics of laminar minerals and application thereof, and particularly relates to the technical field of mineral measurement. The method for measuring the mineral dissociation characteristics comprises the following steps: step a: preparing a flaky mineral into a polished section, and searching target mineral particles in the polished section; step b: measuring exposed side length A, perimeter B and area S of the target mineral particles, and calculating the ratio Q of the exposed side length A to the perimeter B; step c: dividing the mineral type of the target mineral particles according to a ratio Q; step d: repeating the processes of the step b and the step c to obtain N target mineral particles; step e: the proportion of each mineral type is calculated from the target mineral particle area S, the target mineral particle number N and the corresponding mineral type particle number. The method is convenient to measure, more accurate in dissociation characteristic measurement result of the lamellar minerals and closer to actual production, provides more accurate basis for guiding actual production, and is suitable for large-scale popularization and use.
Description
Technical Field
The invention relates to the technical field of mineral measurement, in particular to a method for measuring dissociation characteristics of laminar minerals and application thereof.
Background
Due to the large diameter-thickness ratio, only the strip-shaped area can be exposed in two-dimensional observation. But the laminar minerals are actually very large in specific surface area and once exposed have excellent floatability during flotation, so some intergrowths can also get into the product. Therefore, in the actual detection process, not only the monomer dissociation degree needs to be measured, but also corresponding parameters need to be set for part of the intergrowth to measure and judge the dissociation characteristics.
The existing measurement method related to mineral dissociation characteristics is mineral monomer dissociation degree measurement, and specifically comprises an intercept method and an area method. The mineral monomer dissociation degree measurement only emphasizes the statistics of the monomer part, namely, the monomer dissociation degree measurement is only carried out, and the measurement of the intergrowth in the lamellar mineral is not suitable.
When the conventional intercept method or area method is used for researching the dissociation characteristics, the research result of the dissociation characteristics is greatly different from the actual separation result of minerals, the accuracy is not high, and even the establishment of the separation parameters and indexes is misled.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One of the objectives of the present invention is to provide a method for measuring dissociation characteristics of lamellar minerals, which solves the technical problems in the prior art that the research result of the dissociation characteristics by the intercept method or the area method has a large difference with the actual separation result of lamellar minerals, the accuracy is not high, and even the establishment of separation parameters and indexes is misled.
The invention also aims to provide the application of the method for measuring the dissociation characteristics of the laminar minerals in the measurement of the laminar minerals, and provide a more accurate basis for guiding the actual production.
In order to solve the technical problems, the invention adopts the following technical scheme:
a first aspect of the invention provides a method of laminar mineral dissociation signature measurement comprising the steps of:
step a: preparing a flaky mineral into a polished section, and searching target mineral particles in the polished section;
step b: measuring exposed side length A, perimeter B and area S of the target mineral particles, and calculating the ratio Q of the exposed side length A to the perimeter B;
step c: dividing the mineral embedding type of the target mineral particles according to the ratio Q;
step d: repeating the processes of the step b and the step c to obtain N target mineral particles;
step e: the proportion of each mineral type is calculated from the target mineral particle area S, the target mineral particle number N and the corresponding mineral type particle number.
Further, in step c, the mineral intercalation types include monomers, consortia and inclusion.
Further, the minerals include lamellar minerals.
Further, the lamellar minerals include molybdenite, crystalline graphite, or mica.
Further, when the target mineral particles are molybdenite, the target mineral particles having a Q of not less than 0.25 are recovered.
Further, when the target mineral particles are crystalline graphite, the target mineral particles with Q being more than or equal to 0.7 are recovered.
Further, when the target mineral particles are mica, the target mineral particles having a Q of not less than 0.4 are recovered.
Further, N is not less than 500 and is an integer in step d.
Further, the calculation formula of the monomer ratio is as follows:
wherein D represents the monomer ratio;
s represents the area of the mineral particles of interest;
k is the number of monomer particles;
and N is the number of target mineral particles.
Further, the formula for calculating the consortium proportion is as follows:
wherein E represents the proportion of this type of consortium;
n represents the type of consortium;
s represents the area of the mineral particles of interest;
l is the number of this type of intergrowth particles;
and N is the number of target mineral particles.
Further, the calculation formula of the inclusion proportion is as follows:
wherein F represents the proportion of inclusions;
s represents the area of the mineral particles of interest;
m is the number of inclusion particles;
and N is the number of target mineral particles.
A second aspect of the invention provides the use of the method of mineral dissociation characteristic measurement of the first aspect in a layered sheet mineral.
Further, the lamellar minerals include molybdenite, crystalline graphite, or mica.
The method for measuring the dissociation characteristics of the lamellar minerals solves the technical problems that in the prior art, the difference between the research result of the dissociation characteristics by an intercept method or an area method and the actual separation result of the lamellar minerals is large, the accuracy is not high, and even the establishment of the separation parameters and indexes is misled. The method is convenient to measure, easy to identify target mineral particles, more accurate in mineral dissociation characteristic measurement result and closer to actual production.
The application of the method for measuring the dissociation characteristics of the lamellar minerals in the lamellar minerals provides more accurate basis for guiding actual production, and is suitable for large-scale popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an intercept method for measuring dissociation degree of minerals;
FIG. 2 is a schematic diagram of the area method for measuring the dissociation degree of minerals;
figure 3 shows the particles in the actual concentrate product;
FIG. 4 is a schematic diagram comparing measurements made by the prior art method and the present method;
FIG. 5 is a graph showing the dissociation characteristics of target mineral particles at different Q values;
FIG. 6 is a schematic view of a measurement step;
FIG. 7 is a micrograph of molybdenite mineral particles in the example sample;
FIG. 8 shows the measurement of the exposed side length A, area S and perimeter B of molybdenite in the example;
fig. 9 is a flow chart of the flotation of molybdenite in the verification example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. The components of embodiments of the present invention may be arranged and designed in a wide variety of different configurations.
The lamellar mineral has a lamellar crystal structure, is extended in two dimensions, and has a large diameter-thickness ratio. Lamellar minerals are of great value and significance in today's industrial production. The layered mineral structure has some typical characteristics, for example, molybdenite has good semiconductor properties and mechanical flexibility, and is an important potential raw material for preparing semiconductor materials and electronic storage materials; the muscovite has good insulativity, heat resistance and water and moisture resistance and is widely applied to the advanced scientific and technological fields of electrical appliance industry, electronic industry, aerospace and the like; the crystalline graphite has the advantages of high temperature resistance, corrosion resistance, self lubrication, electric conduction and heat conduction, and wide application in the fields of metallurgy, batteries, photoelectricity, sensors, aerospace, aviation and the like.
With the increasing demand for lamellar minerals in the field of new materials, how to separate lamellar minerals from raw ores and obtain products meeting industrial requirements becomes a hot point in recent years.
Since the separation of valuable minerals is based on mineral dissociation, numerous documents and patents disclose measurement of the degree of monomer dissociation of minerals to determine indexes such as recovery rate and grade during separation.
The existing measurement method related to mineral dissociation characteristics is mineral monomer dissociation degree measurement, and specifically comprises an intercept method or an area method.
Fig. 1 is a schematic diagram of the intercept method for measuring the dissociation degree of minerals, wherein the intercept method is realized by the under-lens statistics of an optical microscope: utilize the dipperstick in the optical microscope eyepiece visual field, let the granule pass through the dipperstick one by one, then regard as the monomer when the granule is all to valuable mineral on the intercept of dipperstick, when granule on the intercept of dipperstick is that valuable mineral also has other mineral promptly, then think as the intergrowth. If considered a monomer, the intercept length of the particle on the dipstick is recorded as a weight to calculate the degree of dissociation of the monomer.
Fig. 2 is a schematic diagram of the dissociation degree of minerals measured by an area method, a particle containing valuable minerals is searched by using a mineral image recognition technology, and then a computer is used for measuring the proportion of the area of the valuable minerals in the particle to the area of the whole particle, so as to judge whether the particles are single bodies or intergrowths.
Current intercept or area methods usually only emphasize statistics on the monomeric fraction, i.e. only measurements of the degree of dissociation of the monomers are performed. The method has good applicability to common granular or irregular mineral particles with small difference of length and length diameters. But for lamellar minerals, the measurement cannot be carried out by taking the intercept or the area as parameters due to the difference of long and short diameters, large specific surface area and excellent floatability of the minerals. When the intercept method or the area method is used for dissociation characteristic research, a large difference or even a contradiction occurs between the research result of the dissociation characteristic and the actual separation result of minerals.
Other indirect methods are only suitable for determining the dissociation degree of a certain type of sample under certain special conditions, or can only indirectly estimate the dissociation condition of the same type of particles in the sample by a mathematical statistics method, but cannot accurately and directly judge and measure the dissociation characteristics of the single particles.
According to a first aspect of the present invention there is provided a method of laminar mineral dissociation signature measurement comprising the steps of:
step a: preparing a flaky mineral into a polished section, and searching target mineral particles in the polished section;
step b: measuring exposed side length A, perimeter B and area S of the target mineral particles, and calculating the ratio Q of the exposed side length A to the perimeter B;
step c: dividing the mineral type of the target mineral particles according to a ratio Q;
step d: repeating the processes of the step b and the step c to obtain N target mineral particles;
step e: the proportion of each mineral type is calculated from the target mineral particle area S, the target mineral particle number N and the corresponding mineral type particle number.
The method for measuring the dissociation characteristics of the lamellar minerals solves the technical problems that in the prior art, the difference between the research result of the dissociation characteristics by an intercept method or an area method and the actual separation result of the lamellar minerals is large, the accuracy is not high, and even the establishment of the separation parameters and indexes is misled. The method is convenient to measure, easy to identify target mineral particles, more accurate in mineral dissociation characteristic measurement result and closer to actual production.
In some embodiments of the present invention, the lamellar minerals are formed into powdered, granular mineral processing crushed ore or ground ore products, and the powdered, granular mineral processing crushed ore or ground ore products are formed into polished sheets which can be observed and measured under a reflection microscope or a scanning electron microscope.
In some embodiments of the invention, the particles of the sample are observed under a light microscope or scanning electron microscope, and the particles of the target mineral are found according to the optical characteristics or back scattering image characteristics of the target mineral.
And obtaining a mineral microscopic image of the target mineral particles in a reflection microscope or a scanning electron microscope. The mineral image processing software is typically, but not limited to, AxioVision by mineral image processing software.
According to the scale of the mineral microscopic image, the exposed side length A of the target mineral particle, the perimeter B and the area S of the whole particle are measured, and the ratio Q of the exposed side length A of the target mineral particle and the perimeter B of the whole particle is calculated.
In one embodiment of the present invention, a specific measurement method is as shown in fig. 6, according to the scale of the mineral microscopic image, the exposed side length a =18 of the target mineral particle is measured, the circumference B =30 and the area S =15mm of the whole particle are measured2And the ratio Q of the exposed edge length a of the target mineral particle to the circumference B of the entire particle was calculated to be 0.6.
And (5) performing mineral dissociation characteristic judgment from the obtained ratio Q:
when Q =1, the target mineral particles are monomeric and enter flotation concentrate recovery.
When Q =0, the target mineral particles are inclusions and are difficult to enter the flotation concentrate for recovery.
When Q is more than 0 and less than 1, the target mineral particles are intergrowths, and the Q value represents the intergrowth characteristics of the target mineral particles. A closer Q value to 1 indicates that the target mineral particles are more likely to enter the flotation concentrate to be recovered, and a closer Q value to 0 indicates that the target mineral particles have a lower probability of entering the flotation concentrate. Fig. 5 is a graph showing the dissociation characteristics of target mineral particles with different Q values.
Further, in step c, the mineral intercalation types include monomers, consortia and inclusion.
The monomer is that after the ore is crushed, only the target mineral to be sorted is on one particle; the intergrowth refers to a granule which contains other minerals besides a target mineral to be selected, but the target mineral may have an exposed part; inclusion refers to the situation where the target mineral on one particle is completely encapsulated by other minerals.
Further, the method also comprises the step of dividing the types of the symbiota according to the ratio Q in the step c.
Further, when the target mineral particles are molybdenite, the target mineral particles having a Q of not less than 0.25 are recovered.
In one embodiment of the invention, when the pre-discarding and tailing-sorting of the molybdenite are carried out, the recoverable symbiont is set as the ratio Q more than or equal to 0.25 because the requirement on the grade is not high and the floatability of the molybdenite is obviously different from that of other nonmetallic minerals; while the ratio Q < 0.25 is a poor consortium that is difficult to recover.
Further, when the target mineral particles are crystalline graphite, the target mineral particles with Q being more than or equal to 0.7 are recovered.
In one embodiment of the invention, the embodiment carries out graphite concentration, and because the requirement on the grade is high, other minerals are prevented from entering as much as possible, and the ratio Q is set to be more than or equal to 0.7 to be the enriched intergrowth; and the ratio Q is less than 0.7, which is a poor intergrowth and needs to be ground for further dissociation.
Further, when the target mineral particles are mica, the target mineral particles having a Q of not less than 0.4 are recovered.
Further, in step e, calculating the proportion of each type of the symbiota.
Further, N is not less than 500 and is an integer in step d.
The data reflected after N.gtoreq.500 can represent the representativeness of the whole sample. In some embodiments of the invention, N is typically, but not limited to, 600, 700, 1000, 1500, or 2000.
Further, the calculation formula of the monomer ratio is as follows:
wherein D represents the monomer ratio;
s represents the area of the mineral particles of interest;
k is the number of monomer particles;
and N is the number of target mineral particles.
Further, a formula for calculating the ratio of the intergrowthComprises the following steps:
wherein E represents the proportion of this type of consortium;
n represents the type of consortium;
s represents the area of the mineral particles of interest;
l is the number of this type of intergrowth particles;
and N is the number of target mineral particles.
Further, the calculation formula of the inclusion proportion is as follows:
wherein F represents the proportion of inclusions;
s represents the area of the mineral particles of interest;
m is the number of inclusion particles;
and N is the number of target mineral particles.
In some embodiments of the invention, fig. 3 shows the particle situation in the actual concentrate product, and the particles in the molybdenum concentrate (i.e. the product obtained after flotation) observed under a scanning electron microscope are sorted by the lamellar mineral molybdenite (the off-white bright part is the target mineral molybdenite, and the brown-gray dark part is other minerals). Particles deficient in intergrowth (double circles) can be found in addition to monomers (single circles). The lean intergrowth particles cannot enter the concentrate product. But the actual situation is: valuable minerals can still be recovered in flotation concentrates due to their large open surface throughout the particle and the good floatability of the lamellar minerals themselves. In this case, if it is determined that the poor consortium is difficult to recover by the intercept method or the area method, the dissociation characteristics are erroneously determined to establish the selection parameters and indexes.
Fig. 4 is a schematic diagram comparing the measurement of the conventional method and the measurement of the method, and it can be seen that if the method for measuring the mineral dissociation characteristics provided by the present invention is used for measurement, the enriched consortium with a high valuable mineral content is judged, and meanwhile, the enriched consortium belongs to the category that the enriched consortium can be recovered through the definition of the judgment parameter Q value.
According to a second aspect of the invention there is provided the use of a method of mineral dissociation signature measurement according to the first aspect in a layered sheet mineral.
The application of the mineral dissociation characteristic measurement method provided by the invention in lamellar minerals provides more accurate basis for guiding actual production, and is suitable for large-scale popularization and application.
Further, the lamellar minerals include molybdenite, crystalline graphite, and mica.
The present invention will be described in further detail with reference to examples and comparative examples.
The model of the light-reflecting microscope used in the inventive examples and comparative examples was ZEISS scope.a1, the manufacturer ZEISS.
Examples
In this embodiment, the dissociation characteristics of molybdenite in a molybdenum ore product are measured by the following specific steps:
(1) the powder product is made into a light sheet sample which can be observed and measured by a reflection microscope;
(2) observing and finding molybdenite-containing particles under an optical reflection microscope;
(3) obtaining a microscopic image of the mineral containing molybdenite particles in a suitable proportion, as shown in fig. 7;
(4) the exposed side length a of the molybdenite-containing particles, the circumference B of the entire molybdenite-containing particles, and the area S of the molybdenite were measured by mineral image processing software AsioVision, as shown in fig. 8, and the ratio Q of the exposed side length a to the circumference B was calculated.
(5) The dissociation characteristics of the particles were divided according to the ratio Q and the data are recorded in table 1.
TABLE 1 measurement report
(6) 500 molybdenite-containing particles were measured and counted in the same manner.
(7) Refinement of dissociation characteristics of particles of the consortium fraction: based on the process purpose of pre-tailing discarding and the mineral property characteristics of molybdenite, judging that the molybdenite is an enriched consortium and can be recycled when Q is more than or equal to 0.4; the loss-prone poor consortium occurs when Q < 0.4.
(8) The proportions of monomers, enriched consortia, depleted consortia and inclusion of molybdenite were calculated and the results are shown in table 2.
TABLE 2 dissociation characteristics calculation Table/%)
Verification example
Molybdenite was floated from one of the molybdenum ores in the examples, and the same batch of raw ore was used as in the examples. The flotation process is shown in figure 9, the raw ore is ground by a ball mill, the grinding fineness is P80-105 μm, and the recovery rate of the molybdenum concentrate is 88.74%.
From the results of the examples and the verification examples, the ratio of the monomer and the enriched consortium measured with the present method was 90.21%, i.e. the recoverable ratio in the sample was considered to be 90.21% after measurement by the present method. And the actual recovery rate obtained in actual production is 88.74 percent, and the actual recovery rate is very close to the theoretical value due to the loss in the actual production process, so that a better recovery effect is obtained.
As can be seen from the examples and the verification examples, the measurement method provided by the invention can be used for more accurately judging the dissociation characteristics of the layered minerals, so that the dissociation characteristics are consistent with production results, the actual production can be better guided, and the method is suitable for large-scale popularization and application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of laminar mineral dissociation signature measurement, comprising the steps of:
step a: preparing a flaky mineral into a polished section, and searching target mineral particles in the polished section;
step b: measuring exposed side length A, perimeter B and area S of the target mineral particles, and calculating the ratio Q of the exposed side length A to the perimeter B;
step c: dividing the mineral type of the target mineral particles according to a ratio Q;
step d: repeating the processes of the step b and the step c to obtain N target mineral particles;
step e: the proportion of each mineral type is calculated from the target mineral particle area S, the target mineral particle number N and the corresponding mineral type particle number.
2. The method of slice mineral dissociation signature measurement of claim 1, wherein in step c, the mineral types of intercalation include monomers, consortia and inclusions.
3. The method of sheet mineral dissociation signature measurement of claim 1, wherein the minerals comprise sheet minerals.
4. The method of lamellar mineral dissociation signature measurement of claim 3, characterized in that the lamellar mineral comprises molybdenite, crystalline graphite or mica.
5. The method for measuring the dissociation characteristics of lamellar minerals according to claim 4, wherein when the target mineral particles are molybdenite, the target mineral particles having Q ≥ 0.25 are recovered.
6. The method for measuring the dissociation characteristics of lamellar minerals according to claim 4, wherein when the target mineral particles are crystalline graphite, the target mineral particles having Q.gtoreq.0.7 are recovered.
7. The method for measuring the dissociation characteristics of lamellar mineral according to claim 4, wherein when the target mineral particles are mica, the target mineral particles having a Q of 0.4 or more are recovered.
8. The method for measuring the dissociation characteristics of lamellar minerals according to any of claims 1 to 7, characterized in that in step d N ≧ 500 and N is an integer.
9. Use of the method of sheet mineral dissociation signature measurement according to any of claims 1 to 8 in sheet minerals.
10. Use according to claim 9, wherein the lamellar minerals comprise molybdenite, crystalline graphite or mica.
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| CN112819809A (en) * | 2021-02-24 | 2021-05-18 | 中国地质大学（北京） | Method for quantifying mineral particle morphology in rock |
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| CN101034059A (en) * | 2006-12-26 | 2007-09-12 | 重庆大学 | Method for measuring reflectivity of mineral and composition of mineral phase |
| RU2017103717A3 (en) * | 2017-02-03 | 2018-08-03 | ||
| CN110672531A (en) * | 2019-10-12 | 2020-01-10 | 东华理工大学 | Method for identifying heavy sand minerals by utilizing microscopic hyperspectral images |
| CN110672606A (en) * | 2019-10-12 | 2020-01-10 | 东华理工大学 | Automatic identification method for homogeneous mineral micro-transmission hyperspectral image |
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