Quartz fine sand screening device and production line with same

Abstract

The application belongs to the technical field of quartz sand screening process and equipment, and particularly relates to a quartz fine sand screening device and a production line with the same. The particle group mixing phenomenon is relatively serious during grading, the operation control of hydraulic grading is relatively strict, and the control process is prone to fluctuation. Once the control factors change during production, the grading is prone to failure. The application provides a quartz fine sand screening device, which can provide a relatively stable hydraulic grading suspension system and has a fine sand screening function. The production line adopting the screening device can realize mass production of quartz fine sand. The quartz sand flotation method disclosed by the application is easy to realize and simple to operate. The quartz sand can be quickly and effectively separated through the method and a flotation reagent, so that the yield of fine sand is improved, and the production cost and the labor intensity of the front-line operator are reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of quartz sand screening process and equipment, specifically relating to a quartz fine sand screening device and a production line having the same. Background Technology

[0002] Quartz sand is an important industrial mineral raw material, widely used in numerous industries such as glass, electronics, machinery casting, metallurgy, chemicals, cement, daily-use ceramics, refractory materials, superhard materials, functional fillers, and oil drilling, resulting in continuously growing demand. The applicant's region has proven silica sand reserves of 5 billion tons, with an average ore layer thickness of over 100 meters. Formed by natural aeolian deposition, its simple structure makes it extremely easy to mine and possesses high mining value. The natural silica sand in this region is primarily composed of quartz and feldspar, featuring a stable mineral composition, a silica content exceeding 85%, uniform particle size, elliptical shape, relatively high mud content, and a smooth surface. After certain processing techniques, it enjoys a high reputation in the domestic casting and glass industries.

[0003] With the continuous expansion of quartz sand production scale and a significant increase in output, the requirements for quality have become more stringent, and particle size classification is a crucial step in the production process. The classification method and type of classification machinery used will have a significant impact on the investment costs, product quality, and operating costs of quartz sand production equipment. Therefore, in-depth research on classification machinery and equipment in quartz sand production is of great practical significance for improving product quality and reducing production costs. For example, silica sand for glassmaking needs to remove coarse particles of +0.8 mm and fine particles of -0.1 mm; while foundry sand, before being sold to users, needs to be separated into various specifications such as 45 / 75 mesh, 55 / 100 mesh, 75 / 150 mesh, and 100 / 200 mesh at the concentrator, and each grade of silica sand requires a particle size distribution (precision) of 75-80% or higher. Therefore, the quality of silica sand classification directly affects product quality.

[0004] Currently, there are two main methods for classifying silica sand in China: one is grading using screens (flat shaking screens, high square screens, cylindrical screens, vibrating screens, etc.), and the other is hydraulic classification (including desliming). When screening silica sand with a particle size of 0.1~1 mm (especially finer), the screen is prone to clogging, resulting in low classification efficiency and severe screen wear. Many silica sand beneficiation plants in China use hydraulic classification, mainly using desliming buckets or modified desliming buckets with upward water flow conical (or cylindrical) hydraulic classifiers for desliming or classification. This type of hydraulic classification equipment itself has no moving parts and does not wear, which can meet the requirements of various industrial sectors (especially the glass industry) for silica sand particle size to a certain extent; however, for departments with strict particle size requirements (such as precision casting), it is sometimes difficult to guarantee quality, and spiral classifiers and hydrocyclones are only used by a few silica sand beneficiation plants. Spiral classifiers are difficult to control the overflow particle size, and the rotating parts are prone to wear; hydrocyclones are more sensitive to operating conditions such as water pressure and feeding.

[0005] Most foundry sand production enterprises in my country use a series of conical hydraulic classifiers (including cylindrical hydraulic classifiers with a smaller lower cone and a certain height column at the top) to continuously deslim and classify natural silica sand through a water washing tower. Although this type of classifier has a simple structure, low manufacturing cost, and is relatively easy to operate, its classification effect is poor when used for classifying coarser particles (0.3~1 mm) due to the limitations of its structure. The classified products have serious mixing of coarse and fine particles, low particle size concentration, and are prone to producing unqualified products.

[0006] Abroad, silica sand classification also mainly employs screening and hydraulic classification. Natural sand desliming is generally done using hydrocyclones; when the raw sand contains very few impurities, the main beneficiation operation is classification. To improve classification effectiveness and efficiency, many foreign companies focus on researching and developing high-efficiency classification equipment, such as arc screens, jet classifiers, siphon classifiers, and various rising water flow classifiers.

[0007] Silica sand has a wide range of applications, and the requirements for particle size (mesh count, particle diameter) vary depending on the application. The required particle size distribution also differs for each grade of silica sand. Especially in large-scale production, the demand for quantity may exceed the demand for precision. Therefore, how to achieve the production requirement of sorting multiple specifications and particle sizes using a single set of equipment (production line) is the main technical problem solved by this invention. Of course, it is not necessarily required that the above-mentioned equipment simultaneously meet both specification and precision requirements; it is also possible to achieve these requirements through the design and improvement of the process method.

[0008] The hydraulic classification process for separating sand first divides the sand in the water separation device into three main categories: a floating layer, a suspended layer, and a settling layer. These occupy the upper, middle, and lower layers of the separation container (the classifier has an input pipe in the middle – the input end; after classification, the uppermost part is discharged through overflow, and the lowermost part is discharged naturally – the output end). In actual production, hydraulic classification is carried out in a hindered settling tank. Due to the characteristics of hydraulic classification, to achieve the required classification accuracy and productivity, the particle sizes must have a high degree of dispersion, which requires a certain cross-sectional size of the equipment. Theoretically, under a constant water flow velocity, the circulating water volume is proportional to the square of the equipment diameter. The larger the equipment's processing capacity and the higher the classification accuracy, the larger the required cross-sectional size of the equipment, and correspondingly, the greater the circulating water volume and power consumption. Therefore, the structural design of the hindered settling tank minimizes the diameter and increases the equipment height to address the issues of particle size dispersion and productivity. Typically, the height of the hindered settling tank is over 3 meters. Due to the structural characteristics of the obstructed settling tank, the equipment investment cost is higher and the plant construction cost is higher compared with screening and grading, even with the same grading capacity.

[0009] The advantages of hydraulic classification are: it separates particles of different sizes through the buoyancy of water flow. Compared with screening, it eliminates the need for screens, reducing maintenance costs, labor intensity, and downtime, while ensuring continuous and stable production. The disadvantages are: hydraulic classification relies on water flow characteristics to separate particles of different sizes; therefore, particle density, shape, and settling conditions all affect the settling velocity. Furthermore, the equipment's cross-sectional dimensions are limited by factors such as power consumption, resulting in significant particle mixing during classification, high power consumption, low separation accuracy, and low unit volume processing capacity. Additionally, hydraulic classification requires strict operation control, and fluctuations in the control process can easily lead to classification failure if any control factors change during production.

[0010] The current production process for quartz glass raw materials generally includes: raw ore screening, crushing, sieving, magnetic separation, acid leaching, washing, drying, flotation, acid leaching, water washing, drying, inspection, packaging, and warehousing. The main equipment used includes crushers, magnetic separators, acid leaching tanks, neutralization equipment, drying ovens, flotation machines, and analytical testing equipment. While there are many methods for cleaning quartz sand, the results are not ideal. Mechanical scrubbing, magnetic separation, and flotation are widely used and suitable for large-scale production, but their iron removal effect is not good. Ultrasonic methods are suitable for production enterprises with high purity requirements and small usage, but not for large-scale production. Acid leaching is costly and causes serious environmental pollution. Microbial iron removal technology is still imperfect, and there are currently no reports of its practical application in production. Recently, there have been patent reports of a simple and practical method for iron removal using ammonium salt complexation to prepare high-purity quartz sand, but this method has low cleaning efficiency, and one of the cleaning process conditions is a temperature of approximately 90℃, which consumes too much energy, making it unacceptable to most quartz sand production enterprises. Summary of the Invention

[0011] The purpose of this invention is to solve the above-mentioned problems and provide a quartz fine sand screening device that can provide a relatively stable hydraulic classification suspension system and has fine sand screening function. The production line using this screening device can realize the mass production of quartz fine sand.

[0012] The above objective is achieved by the following technical solution: A quartz fine sand screening device, characterized in that: The screening device includes a stabilizing and classifying machine, which includes a shell, a chute, an output pipe, an input pipe, and a water inlet pipe. The shell is used to hold materials, and the chute is located around the top outer wall of the shell. The chute is equipped with an outlet pipe. The output tube is located at the bottom of the housing, which has a concave curved surface or a downward-facing conical surface. The output tube is positioned at the lowest point of the curved or conical surface. The input tube is located in the middle of the casing; There is at least one water inlet pipe, which is located at the bottom and / or side of the housing; The bottom of the input tube is provided with a wide opening, which is in the shape of an inverted U. The bottom of the U-shape of the wide opening is fixedly connected to the input tube, and the opening of the U-shape faces downward. The top of the water inlet pipe is equipped with a buffer section, which includes a nozzle and a mixing plate. The nozzle is assembled at the end of the water inlet pipe, and the mixing plate is disc-shaped with a W-shaped longitudinal section. The mixing plate is assembled and connected to the nozzle, or fixedly connected, or integrally formed. The wide opening is aligned with the buffer section.

[0013] The mixing plate includes a nozzle and a turbulence section. The nozzle is connected to the spray head and has a spray hole. The spray head refers to the protruding part in the middle of the W-shaped mixing plate. The spray head is elliptical dome-shaped. The turbulence section refers to the grooved area with curved and rolled edges around the W-shaped mixing plate. The turbulence section is assembled, fixedly connected, or integrally formed with the nozzle.

[0014] The turbulence part is movably connected to the nozzle head, and a nesting part is provided between the turbulence part and the nozzle head. The nesting part includes an outer part and an inner core part. The outer part is located on the outer edge of the nozzle head, and the inner core part is located on the inner edge of the turbulence part. The outer part and the inner core part are fitted with a clearance and nested together, and their curvatures are the same. The inner core is located on the control plate, which is fixedly connected to the end of the inner core, faces the nozzle, and extends through the inner wall of the outer sleeve into the nozzle. The outer casing has a vertical groove, and the control panel is installed inside the vertical groove.

[0015] The wide opening and / or buffer section is provided with a baffle plate, which is rectangular in shape and is fixed vertically or obliquely to the outer wall of the wide opening and buffer section.

[0016] The input pipe and / or water inlet pipe are provided with an adjustment section, which is used to adjust the height between the wide opening and the input pipe, and between the buffer section and the water inlet pipe.

[0017] The adjustment unit includes a fixed tube, a movable tube, a motor, and a transmission unit. The fixed tube is fixedly connected to the input tube or the water inlet tube, or is integrally formed. The movable tube is nested with the fixed tube and is connected in a sealed manner. The motor is mounted on the fixed tube, and the transmission unit is mounted on the movable tube. The transmission unit uses any structure including but not limited to rack, chain, and piston to achieve transmission. The transmission unit is connected to the motor for transmission.

[0018] A production line equipped with the aforementioned quartz fine sand screening device includes a sand dredger assembly, a hydrocyclone assembly, a rotary screen assembly, a primary classifier assembly, a thickener classifier, a stabilizing ore classifier assembly, a vibrating screen, a scrubbing unit, a magnetic separator, a slurry preparation tank assembly, and a flotation machine. Its features are: The sand dredging vessel group includes at least two sand dredging vessels, which are set up in parallel to supply raw materials to the production line. A distributor is provided at the rear of the sand dredging vessels, and the two sand dredging vessels are connected to the distributor through pipelines. The distributor provides a constant slurry to its subsequent hydrocyclone group. The hydrocyclone assembly includes at least four hydrocyclones, which are connected in parallel. The rotary screen assembly includes at least four rotary screens, and the number of rotary screens is consistent with that of the hydrocyclone, with each rotary screen connected in parallel; The primary classifier unit includes at least four primary classifiers, which are connected in parallel. The primary classifier unit is connected to the rotary screen group. The output ends of each rotary screen in the rotary screen group are combined and connected to the primary classifier unit, or the output ends of each rotary screen are respectively connected to the input ends of each primary classifier. The bottom outputs of each primary classifier are combined and connected to the thickening classifier. The thickening classifier is then connected in sequence to the ore stabilization classifier unit, vibrating screen, scrubbing unit, magnetic separator, slurry preparation tank unit, and flotation machine. The ore stabilization and grading unit includes at least four ore stabilization and grading machines, which are connected in parallel. The scrubbing unit includes at least two scrubbing machines, which are connected in parallel. The mixing tank assembly consists of at least six mixing tanks connected in series.

[0019] Its beneficial effects are: the quartz sand flotation method of the present invention is easy to implement and simple to operate. Through this method and flotation reagents, the separation of quartz sand can be achieved quickly and effectively, thereby improving the yield of fine sand, reducing production costs and the labor intensity of front-line operators. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the ore stabilization and grading machine in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the initial state structure of the buffer section in Embodiment 2 of the present invention; Figure 3 This is a schematic diagram comparing the initial state and working state of the buffer section in Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the working state structure of the buffer section in Embodiment 2 of the present invention.

[0021] As can be seen from the figure: 1. Shell 2. Sluice 21. Outlet pipe 3. Output pipe 4. Input pipe 42. Wide opening 5. Inlet pipe 51. Buffer section 52. Nozzle 53. Mixing plate 54. Nozzle head 55. Turbulence section 56. Control board 6. Baffle 7. Adjustment section 71. Fixed pipe 72. Movable pipe 73. Motor 74. Transmission section 8. Nesting section 81. Outer sleeve 82. Inner core. Detailed Implementation

[0022] The quartz sand flotation method of this invention utilizes a slurry pump on a sand dredger to transport raw sand to a gravity separation workshop via a sand conveying pipeline. Gravity separation is used for particle size classification. The classified minerals are weighed by a quantitative feeding device and then fed to a scrubbing machine (to remove impurities from the surface of the mineral particles) for scrubbing. The scrubbed material is deslimed in a desliming and grading slurry tank and then fed to a magnetic separator for magnetic separation. The magnetically separated material is then pumped to a flotation slurry preparation hydrocyclone for concentration and then fed to a slurry preparation tank (with flotation reagents added simultaneously) for slurry preparation. The slurry preparation material is then fed to the flotation machine for reverse flotation. Feldspar is scraped off from the top of the flotation machine, and quartz concentrate is discharged from the bottom. Both products are pumped to a finished product stockpile, concentrated by a hydrocyclone, and then stockpiled (awaiting shipment). Part of the beneficiation water is purified by water treatment equipment and discharged into a water pit for recycling. The other part is pumped to the flotation workshop for recycling, eliminating the environmental impact of beneficiation water and achieving zero-emission environmental protection requirements.

[0023] The principles of flotation processes are largely the same: the mineral particles acquire hydrophobic properties due to their own surface hydrophobicity or after being treated with flotation reagents. Currently, the most widely used method is froth flotation. The prepared slurry is fed into the flotation cell, agitated, and aerated. Mineral particles in the slurry contact and collide with the air bubbles. Particles with good floatability selectively adhere to the bubbles and are carried away, forming a mineralized froth layer composed of a gas-liquid-solid three-phase structure. This layer is then mechanically scraped off or overflows from the slurry surface, dehydrated, and dried to become feldspar. Mineral particles that cannot float are discharged from the bottom of the flotation cell with the slurry and, after dehydration and drying, become the concentrate product.

[0024]

Example 1

[0025] The top of the water inlet pipe is equipped with a buffer section, which includes a nozzle and a mixing plate. The nozzle is assembled at the end of the water inlet pipe, and the mixing plate is disc-shaped with a W-shaped longitudinal section. The mixing plate is assembled and connected to the nozzle, or fixedly connected, or integrally formed. The wide opening is aligned with the buffer section. The inlet pipe fills the classifier with clean water, which helps establish a suspension system, fully balances the sand-to-water ratio within the classifier, and facilitates effective gravity classification. In this embodiment, a conventional inlet pipe and an inlet pipe with a buffer section can be installed simultaneously, or only one of them can be installed. The conventional inlet pipe is generally located at the bottom of the housing, while the inlet pipe with the buffer section is located in the middle of the housing, aligned with the input pipe.

[0026] The mixing plate includes a nozzle and a turbulence section. The nozzle is connected to the spray head and has spray holes. The nozzle refers to the protruding part in the middle of the W-shaped mixing plate, and the nozzle is elliptical dome-shaped. The end of the water inlet pipe is the spray head, and the shape of the spray head depends on the requirements of the classifier. In this embodiment, no special limitation is made. The turbulence section refers to the grooved part with curved and rolled edges on all four sides of the W-shaped mixing plate. The turbulence section is assembled, fixedly connected, or integrally formed with the spray head. The buffer section is aligned with the input pipe. When mortar is input into the input pipe, the mortar at the outlet is disturbed by the mixing plate of the buffer section, which can effectively avoid the impact of the jet from the input pipe on the liquid balance in the classifier. At the same time, the spray head supplies clean water, especially high-pressure water, to the junction of the two to quickly dilute and wash the mortar. On the one hand, it has a certain cleaning effect on the sand particles. On the other hand, the clean water fluid is used as a carrier to quickly mix the supplied mortar into the classifier, so that it can quickly disperse and blend with the existing mortar suspension system in the classifier and establish a relatively stable dynamic mixing balance.

[0027]

Example 2

[0028] To enable the turbulence-inducing section to contract relative to the nozzle, the turbulence-inducing section in this embodiment is a structure composed of multiple independent segments, each segment having a curved shape and corresponding to a nested section. In use, the inlet pipe provides water flow, which impacts the control plates, thereby causing each independent segment of the turbulence-inducing section to move upwards. The bottom of the nozzle and the outer sleeve of the nested section have a narrower top and wider bottom structure. When the turbulence-inducing section is moved upwards, the distance between the two opposing control plates decreases, thus reducing the water flow in the inlet pipe. When the classifier is operating, the input pipe provides slurry, which impacts the buffer section and the slurry impacts the turbulence-inducing section of the mixing plate, causing it to move downwards. This increases the distance between the two opposing control plates, increasing the water flow in the inlet pipe. By adjusting the water flow and pressure in the inlet pipe to match the slurry flow rate in the input pipe, a highly efficient and stable hydraulic classification system is formed, achieving excellent screening results.

[0029] The wide opening and / or buffer section is provided with a baffle plate, which is rectangular in shape and is fixed vertically or obliquely to the outer wall of the wide opening and buffer section.

[0030]

Example 3

[0031] The adjustment unit includes a fixed tube, a movable tube, a motor, and a transmission unit. The fixed tube is fixedly connected to the input tube or the water inlet tube, or is integrally formed. The movable tube is nested with the fixed tube and is connected in a sealed manner. The motor is mounted on the fixed tube, and the transmission unit is mounted on the movable tube. The transmission unit uses any structure including but not limited to rack, chain, and piston to achieve transmission. The transmission unit is connected to the motor for transmission.

[0032]

Example 4

[0033] The primary classifier unit includes at least four primary classifiers, which are connected in parallel. The primary classifier unit is connected to the rotary screen group. The output ends of each rotary screen in the rotary screen group are connected to the primary classifier unit, or the output ends of each rotary screen are connected to the input ends of each primary classifier. The combined connection is beneficial for balancing the mortar composition and concentration, while the independent connection is beneficial for improving work efficiency and classification effect.

[0034] The bottom outputs of each primary classifier are combined and connected to the thickening classifier. The thickening classifier is then connected in sequence to the ore stabilization classifier unit, vibrating screen, scrubbing unit, magnetic separator, slurry preparation tank unit, and flotation machine. The ore stabilization and grading unit includes at least four ore stabilization and grading machines, which are connected in parallel. The scrubbing unit includes at least two scrubbing machines, which are connected in parallel. The mixing tank assembly consists of at least six mixing tanks connected in series.

[0035] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A quartz fine sand screening device, characterized in that: The screening device includes a stabilizing and classifying machine, which includes a shell, a chute, an output pipe, an input pipe, and a water inlet pipe; The shell is used to hold materials, and the chute is located around the top outer wall of the shell. The chute is equipped with an outlet pipe. The output tube is located at the bottom of the housing, which has a concave curved surface or a downward-facing conical surface. The output tube is positioned at the lowest point of the curved or conical surface. The input tube is located in the middle of the casing; There is at least one water inlet pipe, which is located at the bottom and / or side of the housing; The bottom of the input tube is provided with a wide opening, which is in the shape of an inverted U. The bottom of the U-shape of the wide opening is fixedly connected to the input tube, and the opening of the U-shape faces downward. The top of the water inlet pipe is equipped with a buffer section, which includes a nozzle and a mixing plate. The nozzle is assembled at the end of the water inlet pipe, and the mixing plate is disc-shaped with a W-shaped longitudinal section. The mixing plate is assembled and connected to the nozzle, or fixedly connected, or integrally formed. The wide opening is aligned with the buffer section; The mixing plate includes a nozzle head and a turbulence section. The nozzle head is connected to the nozzle and is provided with a nozzle hole. The nozzle head refers to the protruding part in the middle of the W-shaped mixing plate. The nozzle head is elliptical dome-shaped. The turbulence section refers to the grooved area with curved and rolled edges around the W-shaped mixing plate. The turbulence section is assembled, fixedly connected, or integrally formed with the nozzle.

2. The quartz fine sand screening device according to claim 1, characterized in that: The turbulence part is movably connected to the nozzle head, and a nesting part is provided between the turbulence part and the nozzle head. The nesting part includes an outer part and an inner core part. The outer part is located on the outer edge of the nozzle head, and the inner core part is located on the inner edge of the turbulence part. The outer part and the inner core part are fitted with a clearance and nested together, and their curvatures are the same. The inner core is equipped with a control board, which is fixedly connected to the end of the inner core, faces the nozzle, and extends through the inner wall of the outer sleeve into the nozzle. The outer casing has a vertical groove, and the control panel is installed inside the vertical groove.

3. A quartz fine sand screening device according to any one of claims 1 to 2, characterized in that: The wide opening and / or buffer section is provided with a baffle plate, which is rectangular in shape and is fixed vertically or obliquely to the outer wall of the wide opening and buffer section.

4. A quartz fine sand screening device according to any one of claims 1 to 2, characterized in that: The input pipe and / or water inlet pipe are provided with an adjustment section, which is used to adjust the height between the wide opening and the input pipe, and between the buffer section and the water inlet pipe.

5. A quartz fine sand screening device according to claim 4, characterized in that: The adjustment unit includes a fixed tube, a movable tube, a motor, and a transmission unit. The fixed tube is fixedly connected to the input tube or the water inlet tube, or is integrally formed. The movable tube is nested with the fixed tube and is connected in a sealed manner. The motor is mounted on the fixed tube, and the transmission unit is mounted on the movable tube. The transmission unit uses any one of the following structures to achieve transmission: rack, chain, or piston. The transmission unit is connected to the motor for transmission.

6. A production line having a quartz fine sand screening device as described in any one of claims 1 to 2 and 5, the production line comprising a sand dredger assembly, a hydrocyclone assembly, a rotary screen assembly, a primary classifier assembly, a thickener classifier, a stabilizing ore classifier assembly, a vibrating screen, a scrubbing assembly, a magnetic separator, a slurry mixing tank assembly, and a flotation machine. Its features are: The sand dredging vessel group includes at least two sand dredging vessels, which are set up in parallel to supply raw materials to the production line. A distributor is provided at the rear of the sand dredging vessels, and the two sand dredging vessels are connected to the distributor through pipelines. The distributor provides a constant slurry to its subsequent hydrocyclone group. The hydrocyclone assembly includes at least four hydrocyclones, which are connected in parallel. The rotary screen assembly includes at least four rotary screens, and the number of rotary screens is consistent with that of the hydrocyclone, with each rotary screen connected in parallel; The primary classifier unit includes at least four primary classifiers, which are connected in parallel. The primary classifier unit is connected to the rotary screen group. The output ends of each rotary screen in the rotary screen group are combined and connected to the primary classifier unit, or the output ends of each rotary screen are respectively connected to the input ends of each primary classifier. The bottom outputs of each primary classifier are combined and connected to the thickening classifier. The thickening classifier is then connected in sequence to the ore stabilization classifier unit, vibrating screen, scrubbing unit, magnetic separator, slurry preparation tank unit, and flotation machine. The ore stabilization and grading unit includes at least four ore stabilization and grading machines, which are connected in parallel. The scrubbing unit includes at least two scrubbing machines, which are connected in parallel. The mixing tank assembly consists of at least six mixing tanks connected in series.

Images