CN118218118A - Control method of lead zinc ore classification system - Google Patents

Control method of lead zinc ore classification system Download PDF

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Publication number
CN118218118A
CN118218118A CN202410528532.6A CN202410528532A CN118218118A CN 118218118 A CN118218118 A CN 118218118A CN 202410528532 A CN202410528532 A CN 202410528532A CN 118218118 A CN118218118 A CN 118218118A
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CN
China
Prior art keywords
product
ore
granularity
duty ratio
classification
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Pending
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CN202410528532.6A
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Chinese (zh)
Inventor
罗进
谢立志
何志红
马婷
孟德暑
黄道军
蒋家荣
宋远飞
杨智和
陈玉宁
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Yiliang Chihong Mining Industry Co ltd
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Yiliang Chihong Mining Industry Co ltd
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Priority to CN202410528532.6A priority Critical patent/CN118218118A/en
Publication of CN118218118A publication Critical patent/CN118218118A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/52—Spiral classifiers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens

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  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The application relates to a control method of a lead zinc ore grading system, which comprises the following steps: controlling a ball mill to grind lead zinc ores and discharge the ground ore products into a spiral classifier, controlling the spiral classifier to add ore discharge water into the ground ore products to obtain ore pulp, controlling the spiral classifier to perform first classification on the ore pulp to obtain re-grind products and overflow products, conveying the overflow products to a high-frequency vibration fine screen, and conveying the re-grind products back to a ball mill for re-grinding; and (3) controlling the high-frequency vibration fine screen to perform second classification on the overflow product to obtain an oversize product and an undersize product, returning the oversize product to the ball mill for re-grinding, and introducing the undersize product into a flotation machine for flotation. By adjusting the ore discharge water, the spiral classifier performs first classification, and the second classification according to the granularity is realized by adjusting the aperture of the high-frequency vibration fine screen.

Description

Control method of lead zinc ore classification system
Technical Field
The application relates to the technical field of mineral separation and classification, in particular to a control method of a lead zinc ore classification system.
Background
In the ore grinding loop, the classification method is basically divided into two main types, namely, the classification of materials is carried out according to the sedimentation rule of particles in fluid by utilizing gravity or centrifugal force, and common equipment comprises a spiral classifier, a hydrocyclone, a cone classifier, a groove classifier and the like; secondly, the materials are classified according to the granularity by controlling the size of the sieve holes, and common equipment comprises a vibrating sieve, an arc-shaped sieve, a fine sieve and the like.
The lead-zinc ore has the characteristics of high lead-zinc-sulfur content and easy grinding and difficult dissociation, and the grinding classification method adopts a mill and a spiral classifier to form closed-circuit grinding, and the method has low classification efficiency and low classification precision, so that qualified ore particles are reversely enriched in return sand, especially galena, zinc blende, pyrite and other minerals have high density, and part of the qualified ore particles are easily wrapped and clamped by unqualified ore particle groups due to smaller granularity and slower sedimentation speed, cannot be timely discharged from an overflow port, are reversely enriched in return sand, enter the mill to perform secondary grinding, cause overgrinding and influence the index of the sorting method.
Disclosure of Invention
In order to solve or partially solve the problems in the related art, the application provides a control method of a lead-zinc ore grading system, which can solve the technical problems that ore particles qualified in ore grinding are wrapped and clamped and cannot be removed in time, and are reversely enriched in return sand to enter a mill for secondary ore grinding, so that overgrinding is caused and the index of a sorting method is influenced.
The first aspect of the application provides a control method of a lead zinc ore classification system, which is applied to the lead zinc ore classification system, wherein the system comprises a ball mill, a spiral classifier and a high-frequency vibration fine screen, and the screen layout of the high-frequency vibration fine screen is as follows: screen with aperture 0.15 mm: pore size 0.18mm screen = 2:1, the method comprising the steps of:
Firstly, controlling a ball mill to grind lead zinc ores and discharging ground products into a spiral classifier, and controlling the spiral classifier to add ore discharge water into the ground products to obtain ore pulp, wherein the discharge flow of the ore discharge water is 15m 3/h-30m3/h, the concentration of the ore pulp is 70% -75%, the granularity of +200 meshes is 50% -60%, the granularity of-200 meshes is 40% -50%, and the granularity of-500 meshes is 20% -25%;
Secondly, controlling a spiral classifier to perform first classification on ore pulp to obtain a regrind product and an overflow product, conveying the overflow product to a high-frequency vibration fine screen, and conveying the regrind product back to a ball mill for regrind, wherein the concentration of the overflow product is 60-70%, the granularity of +200 meshes is 50-60%, the granularity of-200 meshes is 35-45%, and the granularity of-500 meshes is 15-20%;
finally, controlling the high-frequency vibration fine screen to perform second classification on the overflow product to obtain an oversize product and an undersize product, sending the oversize product back to the ball mill for re-grinding, and sending the undersize product to a flotation machine for flotation, wherein the concentration of the undersize product is 40-45%, the granularity of +200 meshes is 30-35%, the granularity of-200 meshes is 68-72%, and the granularity of-500 meshes is 30-35%.
In some embodiments of the first aspect, optionally,
The second classification judges classification results based on a granularity judgment standard, wherein the granularity judgment standard comprises a first target duty ratio, a second target duty ratio and a third target duty ratio, the first target duty ratio is smaller than 35%, the second target duty ratio is larger than 68%, the third target duty ratio is smaller than 35%, the first target duty ratio is +200 mesh content duty ratio, the second target duty ratio is-200 mesh content duty ratio, and the third target duty ratio is-500 mesh content duty ratio.
In some embodiments of the first aspect, optionally,
The spiral sheets of the spiral classifier are controlled to rotate at a target rotating speed so as to push the regrind products to be discharged to the upper part of the first chute in a rotating way, and the regrind products are returned to the ball mill for regrind through the first chute.
In some embodiments of the first aspect, optionally,
And controlling the spiral classifier to discharge overflow products into a slurry pump pool through a second chute, wherein a slurry pump is arranged in the slurry pump pool, and the overflow products are conveyed to a high-frequency vibration fine screen through the slurry pump for second classification.
In some embodiments of the first aspect, optionally,
And (3) controlling the high-frequency vibration fine screen to send the oversize product to the ball mill for re-grinding through a third chute, and sending the undersize product to a flotation machine through a fourth chute for flotation.
In some embodiments of the first aspect, optionally,
The spiral classifier adjusts the overflow fineness of the first classification by adjusting the concentration of the pulp, and the concentration of the pulp is inversely related to the overflow fineness.
In some embodiments of the first aspect, optionally,
The high-frequency vibration fine screen is controlled to vibrate at a target frequency, so that the high frequency damages the surface tension of the overflow product and the fine material, the separation effect of the high-density material in the overflow product is accelerated, and the contact probability of the small-density material in the overflow product and the sieve holes of the high-frequency vibration fine screen is increased.
The technical scheme provided by the application can comprise the following beneficial effects:
The application provides a control method of a lead zinc ore classification system, which combines the advantages of gravity classification and particle size classification to form a new classification process, and the spiral classifier is used for primarily classifying unqualified ore particles with larger particle size and higher sedimentation speed and basic qualified ore particles by adjusting ore discharge water, the basic qualified ore particles are pumped to a high-frequency vibration fine screen, and the accurate classification according to the particle size is realized by adjusting the aperture of a screen.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a flow chart of a control method according to an embodiment of the present application;
fig. 2 is a schematic diagram of a lead zinc ore classification system according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes the technical scheme of the embodiment of the present application in detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of a control method according to an embodiment of the present application;
the control method of the lead zinc ore classification system shown in fig. 1 is applied to the lead zinc ore classification system shown in fig. 2, and the system comprises a ball mill, a spiral classifier and a high-frequency vibration fine screen.
The control method of the lead zinc ore classification system comprises the following steps:
S1, controlling a ball mill to grind lead zinc ores, discharging the ground ore products into a spiral classifier, and controlling the spiral classifier to add ore discharge water into the ground ore products to obtain ore pulp. The crushed mineral products are fed into a ball mill for grinding by a belt conveyor, the concentration of ore pulp before classification is 70% -75%, the granularity is 50% -60% by +200 meshes, 40% -50% by 200 meshes and 20% -25% by 500 meshes.
S2, controlling the spiral classifier to perform first classification on ore pulp to obtain a regrind product and an overflow product, conveying the overflow product to a high-frequency vibration fine screen, and conveying the regrind product back to the ball mill for regrind.
Classification process of spiral classifier: after the ground ore product is fed into a spiral classifier through a chute, the spiral classifier generates overflow products by floating fine ore particles in water according to the principle that the ore particles are different in size and different in specific gravity, and the overflow products are discharged into a slurry pump pool through a second chute, a slurry pump is arranged in the slurry pump pool, and the overflow products are pumped to a high-frequency vibration fine screen through the slurry pump for second classification. Coarse ore grains are deposited on the bottom of the tank to produce regrind products, the spiral sheets of the spiral classifier are controlled to rotate at a target rotating speed, so that the regrind products are rotationally pushed to the upper part to be discharged into a first chute, and the regrind products are returned to the ball mill for regrind through the first chute.
The spiral classifier adjusts the concentration of ore pulp by adjusting the flow of the ore discharge water added into the ground ore product, and adjusts the overflow fineness of the first classification by adjusting the concentration of the ore pulp, wherein the concentration of the ore pulp is inversely related to the overflow fineness. When the overflow fineness is adjusted by adjusting the concentration of the ore pulp, the lower the concentration of the ore pulp is, the higher the overflow fineness is. Generally, the smaller the particle size, the slower the settling velocity of the ore particles, the easier it is to discharge from the overflow port, but during actual classification, some of the small-sized ore particles will be entrained by the ore particles and rapidly settle, and discharged from the sand return port back to the ball mill via screw conveyance, thereby causing overgrinding.
The method adjusts the flow of the ball mill discharge water so as to adjust the concentration and overflow fineness of ore pulp, and reduces the flow of the ball mill discharge water in the current method to 15m 3/h-30m3/h by 20m 3/h-35m3/h after multiple tests, so that the concentration of overflow products is improved to 60-70% from 45-50% in the current method. The sedimentation rate of the small-granularity ore particles in the first classification is effectively improved, and overgrinding of the small-granularity ore particles is avoided.
After the first classification, the concentration of the overflow product is 60-70%, the granularity of +200 meshes is 50-60%, the granularity of-200 meshes is 35-45%, and the granularity of-500 meshes is 15-20%.
S3, controlling the high-frequency vibration fine screen to perform second classification on the overflow product to obtain an oversize product and an undersize product, sending the oversize product back to the ball mill for regrinding, and leading the undersize product into a flotation machine for flotation. Specifically, the high-frequency vibration fine screen is controlled to convey the oversize product to the ball mill for regrinding through the third chute, the undersize product is led into the flotation machine through the fourth chute for flotation, and the screen layout of the high-frequency vibration fine screen is as follows: screen with aperture 0.15 mm: pore size 0.18mm screen = 2:1.
The classification process of the high-frequency vibration fine screen comprises the following steps: the high frequency is adopted to destroy the tension of the ore pulp surface and the high-speed oscillation of the fine material on the screen surface, so that the separation effect of useful minerals with relatively high density is accelerated, the probability of contacting the materials with smaller separation granularity with the screen holes is improved, and better separation conditions are caused, so that the materials with smaller separation granularity, particularly the materials with high density, are screened out through the screen holes together with the ore pulp.
The second classification judges classification results based on a granularity judgment standard, wherein the granularity judgment standard comprises a first target duty ratio, a second target duty ratio and a third target duty ratio, the first target duty ratio is smaller than 35%, the second target duty ratio is larger than 68%, the third target duty ratio is smaller than 35%, the first target duty ratio is +200 mesh content duty ratio, the second target duty ratio is-200 mesh content duty ratio, and the third target duty ratio is-500 mesh content duty ratio. That is, the more the-200 mesh content ratio is, the better, the less the +200 mesh content ratio is, the better the-500 mesh content ratio is.
The undersize product is the final graded product, the concentration of the undersize product is 40% -45%, the granularity of +200 meshes is 30% -35%, the granularity of-200 meshes is 68% -72%, and the granularity of-500 meshes is 30% -35%.
The Y-plant ore has the characteristics of high lead-zinc-sulfur content and easiness in grinding and dissociation, and in the prior art, qualified ore particles are reversely enriched in return sand, especially galena, zinc blende, pyrite and other minerals have high density, and part of qualified ore particles are easily wrapped by unqualified ore particle groups due to smaller granularity and slower sedimentation speed, cannot be discharged from an overflow port in time, are reversely enriched in return sand, enter a mill for secondary grinding, cause overgrinding and influence on the sorting process index.
Before the grading process is modified, the grinding grading efficiency is always wander within the range of 35-45%, the grading overflow product still presents a distribution proportion of 1:1:1, the +200 mesh content is about 35%, the-500 mesh content is about 36%, the proportion is higher, the distribution is in a dumbbell shape, namely, undissociated coarse particles and overground fine particle fraction are more, and the method is a key factor for restricting the improvement of mineral separation indexes. After grading based on the control method, the graded overflow product is basically in normal distribution, the +200 mesh content is about 30 percent, the-500 mesh content is about 30 percent, the grading efficiency is improved by 12.99 percent, the lead and zinc content in tailings is reduced by 30 percent, the lead recovery rate is improved by 0.2 percent, the zinc recovery rate is improved by 0.35 percent, and the annual effectiveness is improved by 600 thousands yuan.
Finally, it is further noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms include, comprise, or any other variation is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (7)

1. A control method of a lead zinc ore classification system is characterized by comprising the following steps: be applied to plumbous zinc ore classifying system, the system includes ball mill, spiral classifier and high-frequency vibration fine screen, the screen cloth overall arrangement of high-frequency vibration fine screen does: screen with aperture 0.15 mm: pore size 0.18mm screen = 2:1, the method comprising the steps of:
Controlling the ball mill to grind lead zinc ores and discharge the ground ore products into the spiral classifier, and controlling the spiral classifier to add ore discharge water into the ground ore products to obtain ore pulp, wherein the discharge flow of the ore discharge water is 15m 3/h-30m3/h, the concentration of the ore pulp is 70% -75%, the granularity of +200 meshes is 50% -60%, the granularity of-200 meshes is 40% -50%, and the granularity of-500 meshes is 20% -25%;
controlling the spiral classifier to perform first classification on the ore pulp to obtain a regrind product and an overflow product, conveying the overflow product to a high-frequency vibration fine screen, and conveying the regrind product back to the ball mill for regrind, wherein the concentration of the overflow product is 60-70%, the granularity of +200 meshes is 50-60%, the granularity of-200 meshes is 35-45%, and the granularity of-500 meshes is 15-20%;
And controlling the high-frequency vibration fine screen to perform second classification on the overflow product to obtain an oversize product and an undersize product, returning the oversize product to the ball mill for regrinding, and introducing the undersize product into a flotation machine for flotation, wherein the concentration of the undersize product is 40-45%, the granularity of +200 meshes is 30-35%, the granularity of-200 meshes is 68-72%, and the granularity of-500 meshes is 30-35%.
2. The control method according to claim 1, wherein,
The second classification is based on a classification result judged by a granularity judgment standard, wherein the granularity judgment standard comprises a first target duty ratio, a second target duty ratio and a third target duty ratio, the first target duty ratio is smaller than 35%, the second target duty ratio is larger than 68%, the third target duty ratio is smaller than 35%, the first target duty ratio is +200 mesh content duty ratio, the second target duty ratio is-200 mesh content duty ratio, and the third target duty ratio is-500 mesh content duty ratio.
3. The control method according to claim 1, wherein,
And controlling the spiral sheets of the spiral classifier to rotate at a target rotating speed so as to push the regrind product to be discharged to the upper part of the first chute in a rotating way, and returning to regrind of the ball mill through the first chute.
4. The control method according to claim 1, wherein,
And controlling the spiral classifier to discharge the overflow product into a slurry pump pool through a second chute, wherein a slurry pump is arranged in the slurry pump pool, and the overflow product is conveyed to the high-frequency vibration fine screen through the slurry pump to perform second classification.
5. The control method according to claim 1, wherein,
And controlling the high-frequency vibration fine screen to send the oversize product to the ball mill for regrinding through a third chute, and leading the undersize product to the flotation machine through a fourth chute for flotation.
6. The control method according to claim 1, wherein,
The spiral classifier adjusts the overflow fineness of the first classification by adjusting the concentration of the pulp, and the concentration of the pulp is inversely related to the overflow fineness.
7. The control method according to claim 1, wherein,
And controlling the high-frequency vibration fine screen to vibrate at a target frequency so as to enable the high frequency to damage the tension on the surface of the overflow product and the fine material, accelerating the separation effect of the high-density material in the overflow product, and increasing the contact probability of the low-density material in the overflow product and the sieve holes of the high-frequency vibration fine screen.
CN202410528532.6A 2024-04-29 2024-04-29 Control method of lead zinc ore classification system Pending CN118218118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410528532.6A CN118218118A (en) 2024-04-29 2024-04-29 Control method of lead zinc ore classification system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410528532.6A CN118218118A (en) 2024-04-29 2024-04-29 Control method of lead zinc ore classification system

Publications (1)

Publication Number Publication Date
CN118218118A true CN118218118A (en) 2024-06-21

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Application Number Title Priority Date Filing Date
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Country Status (1)

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