Low-grade magnesite associated element separation and extraction system

Abstract

The utility model belongs to the technical field of metallurgical equipment installation, and particularly relates to a low-grade magnesite associated element separation and extraction system which is characterized by comprising a linear vibrating screen, an oversize conveyor, an undersize conveyor, a separation conveyor, a cleaning surge bin and a circulating water system, the oversize product outlet is located on the feeding side of the oversize conveyor, the undersize product outlet is located on the feeding side of the undersize conveyor, the discharging side of the oversize conveyor is located above an inlet of the cleaning buffering bin, and a bottom outlet of the cleaning buffering bin is located on the feeding side of the sorting conveyor. And the upper water and the lower water of the cleaning surge bin are respectively communicated with the circulating water system through pipelines. The washing device has the advantages that washing water is recycled, and water resource consumption is reduced; the ore with the particle size of 12-30 mm is cleaned in a centralized mode through the cleaning buffer bin, and the follow-up sorting effect is improved; and the variable-dip-angle belt conveyor is used for carrying out split-flow conveying on the screened materials, and the occupied area of a production line is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical equipment installation, in particular to a system for separating and extracting associated elements of low-grade magnesite. Background Art

[0002] Magnesite is a carbonate mineral with high industrial value and a dominant mineral resource in my country. It is the main source of magnesium. When a solution containing magnesium acts on calcite, it converts calcite into magnesite, so magnesite also belongs to the calcite family. Magnesite crystals belong to the trigonal carbonate mineral system and are usually granular or cryptocrystalline, dense blocks. The latter is also called porcelain magnesite, which is white or off-white. Iron-containing ones are yellow to brown and have a glassy luster. Magnesite is mainly composed of MgCO3, and iron and manganese often replace magnesium. However, the iron content of natural magnesite is generally not high. Magnesite has a complete rhombohedral cleavage, while porcelain magnesite has a conchoidal fracture. Magnesite often contains iron, which is the result of iron or manganese replacing magnesium.

[0003] After years of mining, high-grade magnesite can no longer meet production needs. Low-grade magnesite also contains gangue minerals such as dolomite and quartz. Magnesite beneficiation primarily removes these gangue minerals to remove impurities such as CaO and SiO₂, yielding high-purity MgO. Dolomite is the primary calcium-containing impurity in magnesite. Its presence leads to the formation of CaSiO₃ during subsequent high-temperature calcination, which readily dissociates upon cooling and affects the properties of light-burned magnesia. Dolomite and magnesite are both carbonate minerals, sharing identical anions and some of the same cations. Their crystal structures and surface properties are very similar, making flotation separation extremely difficult. Therefore, the comprehensive utilization of low-grade, high-calcium, high-silicon magnesite containing gangue minerals such as dolomite and quartz is a global challenge. In particular, the effective industrial removal of dolomite and quartz from magnesite remains a challenge.

[0004] Chinese invention patent application number 201910247353.4 discloses a method for preparing high-purity light-burned magnesium oxide by calcining low-grade magnesite to decalcify and remove silicon. The low-grade magnesite containing dolomite and quartz is cleaned and crushed. The magnesite powder with a particle size of 2.5 to 20 mm is calcined at 600 to 700 ° C for 1 to 2.5 hours to obtain a mixture of decomposed magnesite, dolomite and quartz. The mixture is selectively ground to obtain a grinding product; the grinding product is screened and classified to obtain a grinding product with a particle size of -0.074 mm; the magnesite powder with a particle size of 0.1 to 2.5 mm is placed in a suspension furnace for air calcination and calcined at 570 to 670 ° C for 0.5 to 2 hours to obtain light-burned magnesium recovered by suspension calcination; the light-burned magnesium is then purified by air separation to finally prepare a high-purity light-burned magnesium product.

[0005] Chinese invention patent application number 202010795172.8 discloses a method for screening magnesite with low silica content, comprising the following steps: 1) cleaning of magnesite: using low-grade magnesite as raw material, cleaning, and removing mud and fine-grained minerals on its surface; 2) grinding of magnesite: grinding the magnesite after cleaning in step 1) to obtain ore powder; 3) pulping of magnesite: adding water to the ore powder after grinding in step 2), mixing evenly and preparing slurry to obtain ore pulp; 4) flotation of magnesite: sending the slurry after pulping in step 3) to flotation equipment for reverse flotation to obtain concentrate powder; 5) drying of magnesite: washing the concentrate powder after flotation in step 4) with water, and then drying it.

[0006] In the existing technology, the washing process of dolomite is not recycled, which wastes water resources. In addition, the ore particle size is not classified before washing, resulting in the high-value ore with a particle size of 12-30mm not being effectively cleaned, affecting its subsequent sorting effect. The existing belt conveyor diverts and transports the screened material. Due to the structural limitations of the belt conveyor, in order to obtain sufficient conveying height, the belt conveyor length needs to reach 25 meters, which occupies a large area. Utility Model Content

[0007] The purpose of the utility model is to provide a low-grade magnesite ore associated element separation and extraction system, overcome the shortcomings of the existing technology, adopt a sedimentation tank circulating wash water treatment system to achieve the recycling of wash water, and reduce the consumption of water resources; classify the ore before washing, use a washing buffer bin to centrally wash the 12-30mm particle size ore, improve the subsequent sorting effect, and improve the ore processing efficiency and effect; use a variable inclination belt conveyor to divert and convey the screened material, shorten the length of the belt conveyor, and reduce the floor space of the production line.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The low-grade magnesite associated element separation and extraction system is characterized in that it includes a linear vibrating screen, an overscreen conveyor, an underscreen conveyor, a sorting conveyor, a cleaning buffer bin and a circulating water system. The inlet of the linear vibrating screen is provided with a feed bin, the overscreen material outlet is located on the feeding side of the overscreen conveyor, the underscreen material outlet is located on the feeding side of the underscreen conveyor, the discharge side of the overscreen conveyor is located above the inlet of the cleaning buffer bin, and the bottom outlet of the cleaning buffer bin is located on the feeding side of the sorting conveyor; the water supply and drainage of the cleaning buffer bin are respectively connected to the circulating water system through pipelines.

[0010] The discharge elevation of the above-screen conveyor is 4.5 meters, the elevation angle of the above-screen conveyor is 15-16 degrees, the discharge side elevation of the below-screen conveyor is 4.8 meters, and the elevation angle of the below-screen conveyor is 18-19 degrees.

[0011] The above-screen conveyor and / or the below-screen conveyor are respectively arranged on a variable-angle frame, and the variable-angle frame is a steel frame or a concrete platform.

[0012] The above-screen conveyor and / or under-screen conveyor includes a horizontal section, a variable angle section and a straight section along the length direction. The horizontal section is located on the feeding side, and the end point of the straight section is located on the discharging side. A base frame is provided at the bottom, and an intermediate roller is provided in the center of the top of the base frame. Left rollers and right rollers are provided on both sides of the intermediate roller, and a return roller is provided below the intermediate roller.

[0013] The arc radius of the variable inclination frame of the variable angle section is 30-35 meters.

[0014] The base frame of the variable angle section is a multi-section hinged structure, and adjacent base frames are connected by hinge bolts, so that the conveying angle of any section in the variable angle section is not greater than the repose angle of the ore, and at least one of the intermediate rollers of the variable angle section is a power roller.

[0015] The screen surface of the linear vibrating screen has an installation inclination angle of 8°, the screen surface is suspended, and two vibration motors are arranged on a bracket above the screen surface.

[0016] A suspended vibrating chute is provided at the bottom outlet of the cleaning buffer bin.

[0017] The suspended vibrating chute includes a chute, a vibrating feeder and a suspension member. One end of the chute is located below the bottom outlet of the cleaning buffer bin, and the other end of the chute is located above the feeding side of the sorting conveyor. One end of the chute is connected to the vibrating feeder. The chute and the vibrating feeder are respectively connected to the shelf of the cleaning buffer bin through suspension members. When ore falls on the chute, the chute is inclined at an angle of 8-15° toward the outlet side.

[0018] The circulating water system includes a sedimentation tank and a circulation tank. The sedimentation tank is provided with a 10° inclined bottom. An overflow weir is provided between the sedimentation tank and the circulation tank. The height of the overflow weir is 2000 mm. A submersible pump is provided in the circulation tank. The circulation tank is connected to the water supply well by a water supply pipeline. The sedimentation tank is connected to the water collection tank at the bottom of the cleaning buffer bin through a return water pipeline. The outlet of the submersible pump is connected to the spray pipe in the cleaning buffer bin through an inlet pipeline. A valve is provided on the inlet pipeline.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1) Adopting the sedimentation tank circulating washing water treatment system to realize the recycling of washing water and reduce the consumption of water resources;

[0021] 2) The ore is graded before cleaning, and the 12-30mm particle size ore is centrally cleaned using the cleaning buffer bin, which improves the subsequent sorting effect and improves the efficiency and effect of ore extraction and processing;

[0022] 3) Use a variable-angle belt conveyor to divert and convey the screened materials. At the same conveying height, the length of the belt conveyor is shortened to 20 meters, effectively reducing the floor space of the production line and reducing investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic top view of the structure of an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 Sectional view along line AA;

[0025] Figure 3 yes Figure 1 Cross-sectional view along line BB;

[0026] Figure 4 This is a schematic diagram of the variable inclination frame structure of the variable angle section II in the embodiment of the present utility model;

[0027] Figure 5 yes Figure 4 Cross-sectional view along CC line;

[0028] Figure 6 This is a schematic diagram of the structure of the cleaning buffer bin in the embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of a circulating water system in an embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the sedimentation tank in the embodiment of the present utility model;

[0031] Figure 9 It is a schematic diagram of the structure of the linear vibrating screen in the embodiment of the present utility model.

[0032] In the figure: 1- linear vibrating screen, 2- conveyor above screen, 3- conveyor below screen, 4- sorting conveyor, 5- cleaning buffer bin, 6- feed bin, 7- base frame, 8- middle roller, 9- left roller, 10- right roller, 11- return roller, 12- hinged bolt, 13- suspended vibrating chute, 14- slide trough, 15- vibrating feeder, 16- hanging parts, 17- sedimentation tank, 18- circulation tank, 19- overflow weir, 20- submersible pump, 21- water supply well, 22- booster pump, 23- variable inclination frame, 24- sump, 25- clean water pump. DETAILED DESCRIPTION

[0033] The technical solutions of the present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0035] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but rather represents only selected embodiments of the present invention.

[0036] See Figure 1-3 , is a schematic diagram of an embodiment of the utility model of the separation and extraction system for associated elements of low-grade dolomite, comprising a linear vibrating screen 1, an overscreen conveyor 2, an underscreen conveyor 3, a sorting conveyor 4, a cleaning buffer bin 5 and a circulating water system. A feed bin 6 is provided at the inlet of the linear vibrating screen 1, the overscreen material outlet is located on the feeding side of the overscreen conveyor 2, the underscreen material outlet is located on the feeding side of the underscreen conveyor 3, the discharge side of the overscreen conveyor 2 is located above the inlet of the cleaning buffer bin 5, and the bottom outlet of the cleaning buffer bin 5 is located on the feeding side of the sorting conveyor 4; the water supply and drainage of the cleaning buffer bin 5 are respectively connected to the circulating water system through pipelines.

[0037] The discharge elevation of oversize conveyor 2 is 4.5 meters, with a maximum elevation angle of 15°47'. The discharge elevation of undersize conveyor 3 is 4.8 meters, with a maximum elevation angle of 18°36'. Oversize conveyor 2 is a B650 belt conveyor with a belt speed of 1.25 m / s. Undersize conveyor 3 is a B650 belt conveyor with a belt speed of 1.20 m / s and a maximum elevation angle of 15°. Sorting conveyor 4 is a B800 belt conveyor with a belt speed of 0.20 m / s. It is a parallel belt hand-sorting conveyor that can also be used in conjunction with various artificial intelligence sorting machines.

[0038] See Figure 4-5 The overscreen conveyor 2 and underscreen conveyor 3 are each mounted on a variable-angle frame 23, which is a steel frame or concrete platform. Along their lengths, the overscreen conveyor 2 and underscreen conveyor 3 comprise a horizontal section I, a variable-angle section II, and a straight section III. Horizontal section I is located on the feed side, while straight section III terminates on the discharge side. A base frame 7 is located at the bottom, and an intermediate roller 8 is centrally located at the top of the base frame. Flanking intermediate roller 8 are left and right rollers 9 and 10, respectively. A return roller 11 is located below intermediate roller 8.

[0039] The arc radius of the variable angle frame in variable angle section II is 30 meters. The base frame of variable angle section II is a multi-section articulated structure, with adjacent base frames connected by hinge bolts 12. This ensures that the conveying angle of any section in the variable angle section does not exceed the repose angle of the ore. At least one of the intermediate rollers 8 in variable angle section II is a powered roller.

[0040] See Figure 6-7 The circulating water system includes a sedimentation tank 17 and a circulation tank 18. The sedimentation tank 17 has a 10° inclined bottom. An overflow weir 19 is provided between the sedimentation tank 17 and the circulation tank 18. The height of the overflow weir 19 is 2000mm. A submersible pump 20 is provided in the circulation tank 18. The specification of the submersible pump 20 is 100DL100-20×4, and the flow rate Q=100m 3 / h, the lift is H = 60m, and the submersible pump 20 is equipped with a variable frequency speed regulating motor. Safety guardrails are provided around the sedimentation tank 17 and the circulation tank 18.

[0041] The circulation pool 18 is connected to the water supply well 21 by a water supply pipeline. The sedimentation tank 17 is connected to the water collection tank 24 at the bottom of the cleaning buffer tank 5 through the return water pipeline. The outlet of the submersible pump 20 is connected to the spray pipe in the cleaning buffer tank 5 through the water inlet pipeline. Two spare booster pumps 22 are installed on the water inlet pipeline. The front and rear sides of the two booster pumps 22 are equipped with valves for easy switching. The flow rate of the clean water pump 25 in the water supply well 21 is Q = 5-8m 3 / h, the lift is H=30m.

[0042] See Figure 8 A suspended vibrating chute 13 is installed at the bottom outlet of the cleaning buffer bin 5. The suspended vibrating chute comprises a chute 14, a vibrating feeder 15, and a suspension 16. One end of the chute 14 is located below the bottom outlet of the cleaning buffer bin 5, while the other end is located above the loading side of the sorting conveyor 4. One end of the chute 14 is connected to the vibrating feeder 15. The chute 14 and the vibrating feeder 15 are each connected to the rack of the cleaning buffer bin 5 via a suspension 16. The suspension 16 is an elastic suspension with an internal compression spring. When ore falls onto the chute 14, the chute 14 tilts at an angle of 8-15° toward the outlet, facilitating ore discharge. The vibrating feeder 15 is a GZ6 motor vibrating feeder.

[0043] See Figure 9 The linear vibrating screen 1 has an 8° screen installation angle and is suspended. Two vibration motors are installed on the bracket above the screen. The screen hole diameter is 12mm×12mm. The particle size of the oversize material is 12-30mm, and the particle size of the undersize material is less than 12mm.

[0044] When the utility model is working, the loader feeds the ore from the feed bin 6 to the linear vibrating screen 1, and the linear vibrating screen 1 screens the ore into an oversize part of more than 12 mm and an undersize part of less than 12 mm. The oversize is conveyed on the oversize conveyor 2, and the undersize is conveyed on the undersize conveyor 3. The oversize conveyor 2 and the undersize conveyor 3 are both along the variable inclination frame 23, and their discharge ports reach an elevation of more than 4 meters 5. The undersize conveyor 3 ends at the fine material yard, and the oversize conveyor 2 ends at the cleaning buffer bin 5. After the ore is fully cleaned by the spray pipe, the dolomite and quartz powder in the low-grade magnesite are washed away by water, enter the sedimentation tank 17, and are deposited at the bottom of the sedimentation tank 17. After the wash water is clarified, it enters the circulation tank 18 from the upper edge of the overflow weir 19 and is pumped back to the cleaning buffer bin 5 by the submersible pump 20.

[0045] Magnesite is normally granular or cryptocrystalline, dense, and white or off-white. Iron-containing magnesite is yellow to brown, with a vitreous luster and complete rhombohedral cleavage. Porcelain magnesite has a conchoidal fracture. After thorough cleaning, magnesite is easily sorted by manual or artificial intelligence sorting machines, allowing for the purification of low-grade magnesite and facilitating its further application.

[0046] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Low-grade magnesite associated elements separation and extraction system, characterized by: It includes a linear vibrating screen, an overscreen conveyor, an underscreen conveyor, a sorting conveyor, a cleaning buffer bin and a circulating water system. The inlet of the linear vibrating screen is provided with a feed bin, the overscreen material outlet is located on the feeding side of the overscreen conveyor, the underscreen material outlet is located on the feeding side of the underscreen conveyor, the discharge side of the overscreen conveyor is located above the inlet of the cleaning buffer bin, and the bottom outlet of the cleaning buffer bin is located on the feeding side of the sorting conveyor; the water supply and drainage of the cleaning buffer bin are connected to the circulating water system through pipelines respectively.

2. The low-grade magnesite associated element separation and extraction system according to claim 1, characterized in that: The discharge elevation of the above-screen conveyor is 4.5 meters, the elevation angle of the above-screen conveyor is 15-16 degrees, the discharge side elevation of the below-screen conveyor is 4.8 meters, and the elevation angle of the below-screen conveyor is 18-19 degrees.

3. The low-grade magnesite associated element separation and extraction system according to claim 1, characterized in that: The above-screen conveyor and / or the below-screen conveyor are respectively arranged on a variable-angle frame, and the variable-angle frame is a steel frame or a concrete platform.

4. The low-grade magnesite associated element separation and extraction system according to claim 1, characterized in that: The above-screen conveyor and / or under-screen conveyor includes a horizontal section, a variable angle section and a straight section along the length direction. The horizontal section is located on the feeding side, and the end point of the straight section is located on the discharging side. A base frame is provided at the bottom, and an intermediate roller is provided in the center of the top of the base frame. Left rollers and right rollers are provided on both sides of the intermediate roller, and a return roller is provided below the intermediate roller.

5. The low-grade magnesite associated element separation and extraction system according to claim 4, characterized in that: The arc radius of the variable inclination frame of the variable angle section is 30-35 meters.

6. The low-grade magnesite associated element separation and extraction system according to claim 4, characterized in that: The base frame of the variable angle section is a multi-section hinged structure, and adjacent base frames are connected by hinge bolts, so that the conveying angle of any section in the variable angle section is not greater than the repose angle of the ore, and at least one of the intermediate rollers of the variable angle section is a power roller.

7. The low-grade magnesite associated element separation and extraction system according to claim 1, characterized in that: The screen surface of the linear vibrating screen has an installation inclination angle of 8°, the screen surface is suspended, and two vibration motors are arranged on a bracket above the screen surface.

8. The low-grade magnesite associated element separation and extraction system according to claim 1, characterized in that: A suspended vibrating chute is provided at the bottom outlet of the cleaning buffer bin.

9. The low-grade magnesite associated element separation and extraction system according to claim 8, characterized in that: The suspended vibrating chute includes a chute, a vibrating feeder and a suspension member. One end of the chute is located below the bottom outlet of the cleaning buffer bin, and the other end of the chute is located above the feeding side of the sorting conveyor. One end of the chute is connected to the vibrating feeder. The chute and the vibrating feeder are respectively connected to the shelf of the cleaning buffer bin through suspension members. When ore falls on the chute, the chute is inclined at an angle of 8-15° toward the outlet side.

10. The low-grade magnesite associated element separation and extraction system according to claim 1, characterized in that: The circulating water system includes a sedimentation tank and a circulation tank. The sedimentation tank is provided with a 10° inclined bottom. An overflow weir is provided between the sedimentation tank and the circulation tank. The height of the overflow weir is 2000 mm. A submersible pump is provided in the circulation tank. The circulation tank is connected to the water supply well by a water supply pipeline. The sedimentation tank is connected to the water collection tank at the bottom of the cleaning buffer bin through a return water pipeline. The outlet of the submersible pump is connected to the spray pipe in the cleaning buffer bin through an inlet pipeline. A valve is provided on the inlet pipeline.

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