阅读说明：本技术 矿石结构的统计方法及其应用 (Statistical method of ore structure and application thereof ) 是由 李磊 肖仪武 叶小璐 郜伟 武若晨 王明燕 金建文 于 2020-05-28 设计创作，主要内容包括：本发明提供了一种矿石结构的统计方法及其应用,涉及矿物加工领域,矿石结构的统计方法是以呈现不同矿石结构的目的矿物的面积为基础,计算目的矿物所呈现的不同矿石结构的相对含量,包括以下步骤：a)确定一种需要进行测定矿石结构相对含量的目的矿物的种类；b)获取该目的矿物的至少一个截面的图像；c)对至少一个所述图像中的目的矿物呈现的矿石结构进行划分,获得该目的矿物所呈现的n种矿石结构；d)计算每种矿石结构的总面积S<Sub>i</Sub>,即所有呈现第i种结构的目的矿物的面积之和；不同矿石结构在矿石中的相对含量K<Sub>i</Sub>为：<Image he="77" wi="700" file="DDA0002512810430000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>i为自然数。该方法为回收率预测模型建立、碎磨工艺选择及选矿工艺提供依据。(The invention provides a statistical method of an ore structure and application thereof, relating to the field of mineral processing, wherein the statistical method of the ore structure is based on the area of target minerals presenting different ore structures, and calculates the relative content of the different ore structures presented by the target minerals, and comprises the following steps: a) determining a kind of target mineral required to be subjected to ore structure relative content determination; b) acquiring an image of at least one cross-section of the mineral of interest; c) dividing the ore structure represented by the target mineral in at least one image to obtain n ore structures represented by the target mineral; d) calculating the total area S of each ore structure i I.e. the sum of the areas of all minerals of interest exhibiting the ith structure; relative content K of different ore structures in the ore i Comprises the following steps:)

1. A method for calculating the relative content of different ore structures represented by a target mineral based on the area of the target mineral representing the different ore structures, comprising the steps of:

a) determining a kind of target mineral required to be subjected to ore structure relative content determination;

b) acquiring an image of at least one cross-section of the mineral of interest;

c) dividing the ore structure represented by the target mineral in at least one image to obtain n ore structures represented by the target mineral;

d) calculating the total area S of each ore structure_iI.e. the sum of the areas of all minerals of interest exhibiting the ith structure; relative content K of different ore structures in the ore_iComprises the following steps:

wherein when n is 1, the relative content K of the ore structure in the ore₁The content of the active carbon is 100%,

when n is a natural number of 2 or more, i is a natural number from 1 to n.

2. A statistical method according to claim 1, wherein obtaining an image of at least one cross-section of a mineral of interest comprises:

the ore is fabricated into a slide or slice and the image is obtained using a reflection polarization microscope or a transmission light microscope or a scanning electron microscope.

3. Statistical method according to claim 2, characterized in that the ore is ground into polished chips or flakes.

4. A statistical method according to any one of claims 1-3, characterized in that the target minerals include metallic minerals and non-metallic minerals, and only one target mineral to be measured can be selected at a time.

5. The statistical method of claim 4, wherein the mineral of interest exhibits an ore structure comprising at least one of a eumorphic-semi-eumorphic structure, an aphanitic structure, an inclusion structure, a speckled structure, an erosion structure, an intergrowth structure, a fringed structure, a framorphic structure, an opacified structure, a lattice structure, a figurine structure, a foliate structure, an inclusion metamorphic structure, a radially metamorphic structure, a crumb structure, a strawberry structure, a biological structure, a crushing structure, and a directionally metamorphic structure.

6. Use of the statistical method according to any one of claims 1 to 5 for recovery prediction and attrition milling processes.

Technical Field

The invention relates to the technical field of mineral processing, in particular to a statistical method of an ore structure and application thereof.

Background

In the field of mineral processing, the study of ore structure is an important aspect, which is usually performed under a microscope using a slide or flake. The structure of the ore refers to the characteristics of the mineral particles in the ore, namely the crystallization degree, shape, relative size, mutual distribution relation or distribution relation of the mineral particles and mineral aggregates, and is reflected by the morphological characteristics of the ore.

In ore deposits of different cause types, the types and relative content of the ore structures presented by target minerals have large differences, and the ore structures have important significance for recovery rate prediction, a crushing and grinding process and selection and optimization of a beneficiation process, so that quantitative statistics of the ore structures are particularly important. However, in the current work and research process, the ore structure is one of the indispensable means for researching the cause of the deposit, the symbiotic relationship of the minerals and the physicochemical conditions of the deposit formation can be found out, much more, the research on the meaning of diagenesis and mineralization is focused, and the description of the ore structure is qualitative. In the field of mineral processing, ore structure has a significant impact on the comminution process and ore selectivity, and there is also a lack of quantitative analysis in terms of the relative content of ore structure. If the quantitative characterization of the ore structure presented by the target minerals can be realized, the influence of the ore structure on the crushing and grinding process and the selectivity can be more intuitively understood, and the method has important significance on the establishment of a recovery rate prediction model, the evaluation of an ore deposit and the formulation and optimization of a process flow.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a statistical method of an ore structure, which can quantitatively represent the relative content of the ore structure presented by a target mineral in an ore due to more ore structure types presented by the target mineral in the ore, provide a basis for establishing a recovery rate prediction model and selecting a crushing and grinding process and also provide a basis for optimizing a mineral separation process.

The statistical method of the ore structure provided by the invention is based on the area of the target mineral presenting different ore structures, and calculates the relative content of the target mineral presenting different ore structures, and comprises the following steps:

a) determining a kind of target mineral required to be subjected to ore structure relative content determination;

b) acquiring an image of at least one cross-section of the mineral of interest;

c) dividing the ore structure represented by the target mineral in at least one image to obtain n ore structures represented by the target mineral;

d) calculating the total area S of each ore structure_iI.e. the sum of the areas of all minerals of interest exhibiting the ith structure; relative content K of different ore structures in the ore_iComprises the following steps:

wherein when n is 1, the relative content K of the ore structure in the ore₁The content of the active carbon is 100%,

when n is a natural number of 2 or more, i is a natural number from 1 to n.

Further, acquiring an image of at least one cross-section of the mineral of interest comprises:

the mineral is fabricated into a slide or slice and the image is obtained using a reflection polarization microscope or a transmission light microscope or a scanning electron microscope.

Further, the ore is ground into flake or flake.

Further, the target minerals include metal minerals and nonmetal minerals, and only one target mineral to be measured can be selected at a time.

Further, the mineral structure exhibited by the mineral of interest includes at least one of a eumorphic-semi-eumorphic structure, an aphanitic structure, an inclusion structure, a stigmatic structure, an etched structure, an intergrown residual structure, a rimmed structure, a carclazy structure, an opal structure, a lattice structure, a literature structure, a leaf structure, an inclusion metamorphic structure, a radial metamorphic structure, a crumb structure, a strawberry structure, a biological structure, a crushed structure, and a directional metamorphic structure.

Use of a statistical method as hereinbefore described in recovery prediction and attrition milling processes.

Compared with the prior art, the invention can at least obtain the following beneficial effects:

the statistical method of the ore structure uses the areas of target minerals with different ore structures, and the area of the target minerals is unique in the measurement process, so that the statistical method has the characteristics of high accuracy and good repeatability, the quantitative determination accuracy and the determination rate of the ore structure can be greatly improved along with the development of a computer image technology and an artificial intelligence technology, and the statistical method can be more widely applied; in addition, the statistical method can quantitatively represent the relative content of the ore structure, so that a basis can be provided for establishing a recovery rate prediction model and selecting a crushing and grinding process, and a basis can also be provided for optimizing a mineral separation process.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In one aspect of the invention, the invention provides a statistical method of ore structure, based on the area of a target mineral exhibiting different ore structures, for calculating the relative content of the different ore structures exhibited by the target mineral, the statistical method comprising the steps of:

s100: determining a kind of target mineral required to determine the relative content of the ore structure.

S200: an image of at least one cross-section of the mineral of interest is acquired.

In some embodiments of the invention, obtaining an image of at least one cross-section of a mineral of interest comprises:

the mineral is fabricated into a slide or slice and the image is obtained using a reflection polarization microscope or a transmission light microscope or a scanning electron microscope.

It will be appreciated that the type of mineral of interest in the image and its mineral structure present may be discerned when the image is viewed.

After the ore is manufactured into a polished section, an image in the polished section of the polished section is obtained and can be regarded as a sectional image, and an image of a target mineral in the manufactured polished section can be obtained by using a reflection polarization microscope; similarly, the transmitted light microscope can be used to obtain the image of the target mineral in the slice; images of the mineral of interest can be obtained using a scanning electron microscope, fabricated into a slide or slice.

In some embodiments of the invention, the target minerals include metallic minerals and non-metallic minerals, only one target mineral to be measured at a time; in determining the relative content of the ore structure exhibited by the target mineral, it is desirable to identify a target mineral, for example, chalcopyrite in copper ore can be identified as the target mineral.

In some embodiments of the present invention, for example, in the copper-sulfur ore, the metal minerals are mainly pyrite and chalcopyrite, and trace amounts of limonite, covellite and the like, the chalcopyrite can be used as the target mineral, the pyrite can be used as the target mineral, and the limonite or the covellite can be used as the target mineral.

In some embodiments of the invention, the ore is ground into flakes or flakes. Therefore, the operation is simple and convenient, and the realization is easy.

S300: and dividing the ore structure represented by the target mineral in at least one image to obtain n ore structures represented by the target mineral.

Wherein n is greater than or equal to 1.

It will be appreciated that the type of ore structure in the same deposit is often relatively fixed, and that prior to quantitative analysis of the ore structure, the type of ore structure represented by a particular target mineral in the slice or sheet should be identified; the classification of the ore structure represented by the target mineral in the at least one image refers to the classification of the ore structure represented by the target mineral in the at least one image, so as to calculate the total area of each ore structure subsequently.

In some embodiments of the invention, the mineral structure of interest comprises at least one of a eumorphic-semi-eumorphic structure, an sigmoidal structure, an inclusion structure, a speckled structure, an etched structure, an intergrown residual structure, a rimmed structure, a framorphic structure, an opacified structure, a lattice structure, a literary structure, a foliated structure, an inclusion metamorphic structure, a radial metamorphic structure, a crumb structure, a strawberry structure, a biological structure, a crushed structure, and a directionally metamorphic structure, but is not limited to these structures.

In some embodiments of the invention, the chalcopyrite exhibits an ore structure including a sigmoid structure, a substitution residue structure, a fringed structure, and an inclusion structure.

S400: calculating the total area S of each ore structure_iI.e. the sum of the areas of all minerals of interest exhibiting the ith structure; relative content K of different ore structures in the ore_iComprises the following steps:

wherein when n is 1, the relative content K of the ore structure in the ore₁The content of the active carbon is 100%,

when n is a natural number of 2 or more, i is a natural number from 1 to n.

Note that, i is a natural number from 1 to n means: when n is 2, i can take the values 1, 2,meaning of is K_i＝(S_i/(S₁+S₂) × 100%, when n is greater than or equal to 3, i can take the value of 1, 2 … … n, K_i＝(S_i/∑S_i) × 100% means K_i＝(S_i/(S₁+S₂+……S_n))×100％。

Note that the total area S of each ore structure_iIn the formula, i is not sequentially valued, and S₁To S_nIt is sufficient that each represents the total area of a different ore structure.

In some embodiments of the invention, the chalcopyrite exhibits an ore structure comprising a talocrystailine structure, an intergrowth structure, a rimmed structure and an inclusion structure, and the total area distribution of the talocrystailine structure, the intergrowth structure, the rimmed structure and the inclusion structure can be labeled as S₁、S₂、S₃And S₄Wherein the relative content of the talocrystalline structure (denoted by K)₁) The following formula can be used for calculation: k₁＝(S₁/(S₁+S₂+S₃+S₄) × 100%, relative content of intergrated residual structures (labeled K)₂) The following formula can be used for calculation: k₂＝(S₂/(S₁+S₂+S₃+S₄) × 100%, relative content of edging structure (marked K)₃) The following formula can be used for calculation: k₃＝(S₃/(S₁+S₂+S₃+S₄) × 100%, relative content of inclusion structure (labeled K)₄) The following formula can be used for calculation: k₄＝(S₄/(S₁+S₂+S₃+S₄))×100％。

In some embodiments of the invention, the relative amounts of the talocrystailine structure, the intergrown residual structure, the fringed structure and the inclusion structure in the chalcopyrite are 84.41%, 7.53%, 7.29% and 0.77%, respectively.

In some embodiments of the present invention, in order to make the calculated relative content of different ore structures accurate, different ore structures represented by target minerals in a plurality of polished or sliced sheets may be accumulated (each target mineral particle in an image corresponds to one ore structure, and a cross section in the image is a cross section of a mineral particle), in order to ensure the representativeness of statistical data, the number of particles of the target minerals to be counted should be not less than 1500 (the particles are random statistics, specifically, the content is determined according to the content of the target minerals in the ore, the number of particles can be appropriately reduced when the content is low, and the number of particles should be increased when the content is high), and the sum of the areas of all the ore structures is calculated, and then the calculation of the relative content of the ore structures is performed.

The statistical method of the ore structure uses the area of the target mineral in each ore structure, and the area of the target mineral is unique in the measurement process, so that the statistical method of the invention has the characteristics of high accuracy and good repeatability, the quantitative determination accuracy and the determination rate of the ore structure can be greatly improved along with the development of a computer image technology and an artificial intelligence technology, and the statistical method can be more widely applied; in addition, the statistical method can quantitatively represent the relative content of the ore structure, so that a basis can be provided for the recovery rate prediction and the selection of the crushing and grinding process, and a basis can also be provided for the optimization of the mineral separation process.

In another aspect of the invention, the invention provides the use of the statistical method described above in recovery prediction and attrition milling processes.

It can be understood that, because the influence of different types of ore structures on the grinding process is different, the ore structure quantitative statistical method can quantitatively represent the content of the ore structures of different types, and can provide a basis for selection of the grinding process and establishment of a recovery rate prediction model.

Some embodiments of the present invention will be described in detail below with reference to specific embodiments. The embodiments described below and the features of the embodiments can be combined with each other without conflict.