Dolomite circulating crushing device

Abstract

The utility model discloses a dolomite circulating crushing device which comprises a raw material bin, a raw material conveying belt is arranged between the raw material bin and a first-stage crushing unit, a first-stage conveying belt is arranged between the first-stage crushing unit and a second-stage crushing unit, and a second-stage conveying belt is arranged between the second-stage crushing unit and a third-stage crushing unit. A third-stage conveying belt is arranged between the third-stage crushing unit and the storage bin, a fluidized bed dryer is arranged below the storage bin, a first air separator is arranged between the fluidized bed dryer and the superfine grinding unit, and a second air separator is arranged between the storage bin and the superfine grinding unit.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dolomite powder production technical field, especially relates to a dolomite circulating crushing device. BACKGROUND

[0002] Dolomite belongs to carbonate mineral, and there are two types of ferrodolomite and manganese dolomite, and dolomite is widely applied in many fields such as building material, ceramics, glass, refractory material, chemical industry, agriculture, environmental protection and energy saving as the main mineral component of dolomitic limestone and dolomitic limestone. It is mainly used as alkaline refractory material and flux for blast furnace ironmaking, and can also be used for producing calcium-magnesium phosphate fertilizer, preparing magnesium sulfate, and is also an important ingredient for producing glass and ceramics.

[0003] In actual use, dolomite needs to be processed into dolomite powder first, and the processing procedure mainly includes crushing and screening. Although the ore powder production equipment is relatively mature at present, the production line specially designed for dolomite powder is still in blank state. Therefore, the utility model specially provides a production device suitable for dolomite powder production line. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a dolomite circulating crushing device to solve the problem that there is no corresponding production device when dolomite is processed into dolomite powder. The specific technical scheme is as follows:

[0005] A dolomite circulating crushing device, including raw material bin, the raw material bin is provided with raw material conveying belt between the primary crushing unit, the primary crushing unit is provided with primary conveying belt between the secondary crushing unit, the secondary crushing unit is provided with secondary conveying belt between the tertiary crushing unit, the tertiary crushing unit is provided with tertiary conveying belt between the storage bin, the storage bin is provided with fluidized bed dryer below, the fluidized bed dryer is provided with first winnower between the superfine grinding unit, the storage bin is provided with second winnower between the superfine grinding unit.

[0006] Preferably, the primary crushing unit includes jaw crusher, the jaw crusher is connected below with heavy-duty vibrating screen, the heavy-duty vibrating screen is provided with coarse particle size buffer bin between the jaw crusher, and the heavy-duty vibrating screen is connected to the secondary crushing unit through the primary conveying belt.

[0007] Preferably, the secondary crushing unit includes cone crusher, the cone crusher is provided below with circular vibrating screen, the circular vibrating screen is provided with medium particle size buffer bin between the cone crusher, and the circular vibrating screen is connected to the tertiary crushing unit through the secondary conveying belt.

[0008] Preferably, the third crushing unit comprises a vertical shaft impact crusher, a high-frequency fine screen is arranged below the vertical shaft impact crusher, a fine particle size buffer bin is arranged between the high-frequency fine screen and the vertical shaft impact crusher, and the high-frequency fine screen is connected to the storage bin through the third conveying belt.

[0009] Preferably, the superfine grinding unit comprises a Raymond grinding machine, and two storage bins are arranged at the discharge port of the Raymond grinding machine, one of the storage bins is connected to a third air separator, and the third air separator is connected to a vertical roller mill.

[0010] Preferably, the fluidized bed dryer is connected to a cyclone separator.

[0011] The dolomite circulating crushing device has the following beneficial effects:

[0012] 1. Three crushing units and a superfine grinding unit are arranged in the utility model, continuous processing of dolomite raw materials from coarse crushing to fine powder is realized, the finished product particle size of dolomite powder obtained after passing through the third crushing unit is ≤1mm, the total production capacity of the three crushing units is ≥50t / h, and the finished product particle size of dolomite powder obtained after processing by the superfine grinding unit is 80-120 meshes, 120-200 meshes and 200-450 meshes, so that the crushing device obtains dolomite powder with different particle sizes, and is applied to different technical fields, thereby meeting the diversified needs of the market.

[0013] 2. The fluidized bed dryer is arranged between the superfine grinding unit and the third crushing unit in the utility model, when the moisture content of the raw material is >3%, the fluidized bed dryer can pretreat the dolomite entering the superfine grinding unit, because if the moisture content is large, the adhesion between dolomite powder particles will increase, and the particles are easy to agglomerate together during superfine grinding, forming a large particle group, resulting in uneven fine grinding, affecting the particle size distribution and quality of the final product. The fluidized bed dryer can reduce the moisture content of the dolomite powder to an appropriate range, effectively avoid the agglomeration phenomenon during fine grinding, make the fine grinding process smoother, improve the fine grinding efficiency, and obtain products with more uniform and finer particle size.

[0014] 3. A storage bin is arranged after the third crushing unit in the utility model, the storage bin can buffer the dolomite powder entering the superfine grinding unit, and also facilitates adjustment of whether the fluidized bed dryer operates.

[0015] 4. The utility model discloses a first air separator is arranged between the fluidized bed dryer and superfine grinding unit, when needing to run the fluidized bed dryer, dolomite powder in storage bin is pretreated first through the fluidized bed dryer, and the dolomite powder after pretreatment enters the superfine grinding unit through the first air separator and carries out superfine grinding, a second air separator is arranged between the storage bin and the superfine grinding unit, when not needing to run the fluidized bed dryer, dolomite powder in storage bin enters the superfine grinding unit directly through the second air separator and carries out superfine grinding. According to the characteristics of dolomite powder, the corresponding processing route is set, the whole device has high flexibility, and the device is efficient and convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0017] Figure 1 is a structure diagram of the dolomite circulating crushing device provided by the utility model;

[0018] Main drawing mark explanation:

[0019] 1 - raw material bin, 2 - first stage crushing unit, 3 - second stage crushing unit, 4 - third stage crushing, 5 - storage bin, 6 - fluidized bed dryer, 7 - superfine grinding unit, 81 - first air separator, 82 - second air separator, 21 - jaw crusher, 22 - heavy-duty vibrating screen, 23 - coarse particle size buffer bin, 31 - cone crusher, 32 - circular vibrating screen, 33 - medium particle size buffer bin, 41 - vertical shaft impact crusher, 42 - high-frequency fine screen, 43 - fine particle size buffer bin, 71 - Raymond mill, 72 - storage bin, 73 - third air separator, 74 - vertical roller mill, 91 - raw material conveying belt, 92 - first stage conveying belt, 93 - second stage conveying belt, 94 - third stage conveying belt. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] In the description of the utility model, it needs to be explained that the terms "center", "longitudinal", "transverse"

[0022] The orientation or positional relationship indicated by "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side" and the like is based on the orientation or positional relationship shown in the drawings and is only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the utility model.

[0023] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the terms "first", "second", "third" are described, they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0024] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation. The embodiments of the utility model are described below according to the overall structure of the utility model.

[0025] Referring to Figure 1 A dolomite circulating crushing device, comprising a raw material bin 1, a raw material conveying belt 91 is arranged between the raw material bin 1 and a primary crushing unit 2, a primary conveying belt 92 is arranged between the primary crushing unit 2 and a secondary crushing unit 3, a secondary conveying belt 93 is arranged between the secondary crushing unit 3 and a tertiary crushing unit 4, a tertiary conveying belt 94 is arranged between the tertiary crushing unit 4 and a storage bin 5, a boiling bed dryer 6 is arranged below the storage bin 5, a first air separator 81 is arranged between the boiling bed dryer 6 and a superfine grinding unit 7, and a second air separator 82 is arranged between the storage bin 5 and the superfine grinding unit 7.

[0026] Referring to Figure 1 The primary crushing unit 2 comprises a jaw crusher 21, a heavy-duty vibrating screen 22 is connected below the jaw crusher 21, a coarse particle size buffer bin 23 is arranged between the heavy-duty vibrating screen 22 and the jaw crusher 21, and the heavy-duty vibrating screen 22 is connected to the secondary crushing unit 3 through the primary conveying belt 92.

[0027] The particle size of dolomite that can be processed by the jaw crusher 21 is ≤500 mm, and the particle size of dolomite that comes out of the discharge port of the jaw crusher 21 is ≤80 mm. A heavy-duty vibrating screen 22 is arranged below the discharge port of the jaw crusher 21. The mesh size of the heavy-duty vibrating screen 22 is 80 mm. The particle size of dolomite that passes through the heavy-duty vibrating screen 22 is ≤80 mm, and the particle size of dolomite that is left on the heavy-duty vibrating screen 22 is >80 mm. The dolomite on the heavy-duty vibrating screen 22 enters a coarse-particle-size buffer 23. A conveying belt is arranged between the coarse-particle-size buffer 23 and the jaw crusher 21. The dolomite in the coarse-particle-size buffer 23 is returned to the jaw crusher 21 through the conveying belt for re-crushing. The dolomite that passes through the mesh of the heavy-duty vibrating screen 22 enters the secondary crushing unit 3 through a first conveying belt 92.

[0028] In a specific embodiment, the first crushing unit 2 adopts a jaw crusher 21. The minimum production capacity of the jaw crusher (a PE series jaw crusher) is 60 t / h, and the yield of dolomite is 85%.

[0029] Referring to Figure 1 , the secondary crushing unit 3 includes a cone crusher 31. A circular vibrating screen 32 is arranged below the cone crusher 31. A medium-particle-size buffer bin 33 is arranged between the circular vibrating screen 32 and the cone crusher 31. The circular vibrating screen 32 is connected to the tertiary crushing unit 4 through a second conveying belt 93.

[0030] The cone crusher 31 performs a second crushing on the dolomite that has been processed by the heavy-duty vibrating screen 22. A circular vibrating screen 32 is arranged below the discharge port of the cone crusher 31. The mesh size of the circular vibrating screen 32 is set to 20 mm. The dolomite that has been processed by the cone crusher 31 for a second time enters the circular vibrating screen 32. The particle size of the dolomite that passes through the mesh of the circular vibrating screen 32 is ≤20 mm. The dolomite with a particle size of ≤20 mm enters the tertiary crushing unit 4 through the second conveying belt 93 for a third crushing. The dolomite that is left on the circular vibrating screen 32 enters a medium-particle-size buffer bin 33. A conveying belt is arranged between the medium-particle-size buffer bin 33 and the cone crusher 31. The dolomite in the medium-particle-size buffer bin 33 is returned to the cone crusher 31 through the conveying belt for re-crushing.

[0031] In a specific embodiment, the secondary crushing unit 3 adopts a cone crusher 31. The minimum production capacity of the cone crusher (an HPT+ multi-cylinder hydraulic type) is 55 t / h, and the yield of dolomite is 92%.

[0032] Referring to Figure 1, the third crushing unit 4 comprises a vertical shaft impact crusher 41, a high-frequency fine screen 42 is arranged below the vertical shaft impact crusher 41, and a fine particle size buffer bin 43 is arranged between the vertical shaft impact crusher 41 and the high-frequency fine screen 42, and the high-frequency fine screen 42 is connected to the storage bin 5 through the third conveying belt 94.

[0033] The vertical shaft impact crusher 41 performs the third crushing on the dolomite with a particle size ≤20mm processed by the circular vibrating screen 32, a high-frequency fine screen 42 is arranged below the discharge port of the vertical shaft impact crusher 41, the mesh size of the high-frequency fine screen 42 is 1mm, the particle size of the dolomite crushed by the vertical shaft impact crusher 41 can reach 1mm, the high-frequency fine screen 42 screens the dolomite crushed by the vertical shaft impact crusher 41, the dolomite powder screened by the high-frequency fine screen 42 enters the storage bin 5 through the third conveying belt 94, and the dolomite powder left on the high-frequency fine screen 42 enters the fine particle size buffer bin 43, a conveying belt is arranged between the fine particle size buffer bin 43 and the vertical shaft impact crusher 41, and the dolomite powder with a particle size >1mm in the fine particle size buffer bin 43 can be returned to the vertical shaft impact crusher 41 for re-crushing.

[0034] In a specific embodiment, the third crushing unit 4 adopts a vertical shaft impact crusher 41, and the vertical shaft impact crusher (VSI sand making machine) has a minimum production capacity of 50t / h, and the yield of the dolomite product is 95%.

[0035] The crushing device is provided with three crushing units, each of which is configured with a screening function, and the three-stage crushing and three-stage screening realize the step-by-step particle size screening, so that the qualified rate of the dolomite powder from the third crushing unit is ≥98%, the particle size of the dolomite powder obtained after the process is ≤1mm, the dolomite powder with a particle size ≤1mm has a higher specific surface area, faster reaction activity and better dispersibility, and can be applied to fields with finer requirements for particle size, uniformity or chemical properties, such as paint and putty additives, or artificial stone and ceramic tiles. Therefore, the dolomite powder obtained after the three-stage crushing of the crushing device can be directly utilized or can enter the superfine grinding unit 7 for finer grinding.

[0036] In a more preferred specific embodiment, the first, second and third crushing units can be arranged in a stepped manner to reduce the energy consumption of material conveying by gravity.

[0037] Referring to Figure 1 The superfine grinding unit 7 comprises a Raymond mill 71, two storage bins 72 are arranged at the discharge port of the Raymond mill 71, one of the storage bins 72 is connected to a third air separator 73, and the third air separator 73 is connected to a vertical roller mill 74.

[0038] The Raymond mill 71 can finely grind dolomite powder with a particle size of less than 1 mm, and can obtain dolomite powder with a particle size of 80-200 mesh, and the processing capacity is 8-12 t / h, so that the storage bin 5 can balance the processing speed at this stage. Meanwhile, the Raymond mill 71 is matched with a turbine classifier, which can realize frequency conversion speed regulation, and the particle size is segmented by adjusting the speed of the classifier (200-800 rpm), and the dolomite powder obtained in the low-speed mode of the classifier has a particle size of 80-120 mesh, and the dolomite powder obtained in the high-speed mode of the classifier has a particle size of 120-200 mesh.

[0039] Two storage bins 72 are arranged at the discharge port of the Raymond mill 71, one of which is used for storing dolomite powder with a particle size of 80-120 mesh, and the other is used for storing dolomite powder with a particle size of 120-200 mesh, and the storage bin 72 storing dolomite powder with a particle size of 80-120 mesh is connected with the third air separator 73, and the dolomite powder with a particle size of 80-120 mesh enters the vertical roller mill 74 through the third air separator 73, and the dolomite powder processed by the vertical roller mill 74 has a particle size of 200-450 mesh.

[0040] The dolomite powder with different particle sizes obtained by the superfine grinding unit 7 can be used in different fields, so that the crushing device can use the produced dolomite powder in different fields according to the needs, so that the production of dolomite can meet the market demand.

[0041] Referring to Figure 1 The fluidized bed dryer 6 is connected with a cyclone separator.

[0042] The fluidized bed dryer 6 uses hot air or other hot gas as a drying medium, so that the dolomite powder to be dried is in a fluidized state (similar to boiling) in the bed layer of the dryer, so as to realize sufficient contact and heat and mass transfer between the material and the hot gas, and achieve the purpose of drying. The waste gas containing water during the drying process of the fluidized bed dryer 6 is directly discharged after gas-solid separation by the cyclone separator.

[0043] In summary, the dolomite circulating crushing device provided by the utility model can realize comprehensive coverage of particle size, so as to obtain dolomite powder with different particle sizes, meet diversified market demand, and realize step-by-step particle size screening through three-stage screening, and the comprehensive energy consumption of three-stage screening is reduced by 25%.

[0044] The foregoing description of the specific exemplary embodiments of the present application is for the purpose of illustrating and describing, rather than limiting the application, and it will be apparent to those of ordinary skill in the art that many changes and modifications can be made to the embodiments with the foregoing teaching, notwithstanding what can be suggested above and although only a few of the exemplary embodiments of the present application have been described. Although the embodiments of the present application have been described, the specific embodiments are merely illustrative of the present application and are not intended to limit the present application, and the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and the exemplary embodiments are selected and described for the purpose of explaining the specific principles of the present application and its practical application, so that those skilled in the art can make modifications, replacements, variations and various different selections and changes to the embodiments without creative contribution after reading the specification, as long as they are within the scope of the claims of the present application.

Claims

1. A dolomite recirculating crushing device, characterized by, The device comprises a raw material bin, a raw material conveying belt arranged between the raw material bin and a first crushing unit, a first conveying belt arranged between the first crushing unit and a second crushing unit, a second conveying belt arranged between the second crushing unit and a third crushing unit, a third conveying belt arranged between the third crushing unit and a storage bin, a fluidized bed dryer arranged below the storage bin, a first air separator arranged between the fluidized bed dryer and a superfine grinding unit, and a second air separator arranged between the storage bin and the superfine grinding unit.

2. A dolomite recirculating crushing device according to claim 1, characterised in that, The first crushing unit comprises a jaw crusher, a heavy-duty vibrating screen connected below the jaw crusher, a coarse particle size buffer bin arranged between the heavy-duty vibrating screen and the jaw crusher, and the heavy-duty vibrating screen connected to the second crushing unit through the first conveying belt.

3. A dolomite recirculating crushing device according to claim 1, characterised in that, The second crushing unit comprises a cone crusher, a circular vibrating screen arranged below the cone crusher, a medium particle size buffer bin arranged between the circular vibrating screen and the cone crusher, and the circular vibrating screen connected to the third crushing unit through the second conveying belt.

4. A dolomite recirculating crushing device according to claim 1, characterised in that, The third crushing unit comprises a vertical shaft impact crusher, a high-frequency fine screen arranged below the vertical shaft impact crusher, a fine particle size buffer bin arranged between the high-frequency fine screen and the vertical shaft impact crusher, and the high-frequency fine screen connected to the storage bin through the third conveying belt.

5. A dolomite recirculating crushing device according to claim 1, characterised in that, The superfine grinding unit comprises a Raymond mill, and two storage bins are arranged at the discharge port of the Raymond mill, one of which is connected to a third air separator, and the third air separator is connected to a vertical roller mill.

6. A dolomite recirculating crushing device according to claim 1, characterized in that The fluidized bed dryer is connected to a cyclone separator.

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