CN214582082U

CN214582082U - Mineral dewatering equipment

Info

Publication number: CN214582082U
Application number: CN202120378348.XU
Authority: CN
Inventors: 陈彦任
Original assignee: Uht Unitech Co ltd
Current assignee: Uht Unitech Co ltd
Priority date: 2021-01-27
Filing date: 2021-02-19
Publication date: 2021-11-02
Anticipated expiration: 2031-02-19
Also published as: TWM615393U

Abstract

A mineral dewatering device utilizes a microwave mixing device to generate microwaves and then irradiate the microwaves to minerals, so that the viscosity of mineral soil is reduced, the minerals are further refined, the structure of the minerals is loosened, on one hand, the total surface area of the mineral soil is increased, on the other hand, the retention force of the mineral soil to moisture is weakened, the heating area of the minerals is increased in the subsequent heating process of a rotary furnace, the moisture is easily separated from the mineral soil, the moisture in the minerals is easily evaporated, the moisture content is greatly reduced, and the moisture content of the minerals can be reduced from the range of 30% -35% to the range of 12% -17%.

Description

Mineral dewatering equipment

Technical Field

The present invention relates to mineral processing, and more particularly to a mineral dewatering apparatus.

Background

The refining of various metals is mostly carried out by first mining ores or ore sands from the vein, then transporting the ores or ore sands to a refining unit or plant, and then extracting metals such as iron, aluminum or nickel ore. For some ore soils with high water content, such as laterite-type bauxite and nickel soil ore, the conventional treatment method is to directly transport the ore soil to a destination refining unit or plant, and the refining unit or plant first removes water and then enters the refining process.

This conventional treatment method causes the high water content of the ore soil to be transported from the ore deposit to the refining plant, thereby increasing the weight of the transportation, and also causes the increase of the transportation cost because the volume of the ore soil that can be transported per time is reduced for the same volume of cargo ships or trucks, and the construction of water removal equipment for the refining plant is required, and the construction cost of the refining plant is increased and the process is complicated.

In addition, the existing ore soil dewatering equipment heats and dewaters ore soil in a heating mode, and because the ore soil contains substances with high viscosity such as clay, the water content which can be removed in a set time in a direct heating mode is limited.

SUMMERY OF THE UTILITY MODEL

In view of this, the technical problem solved by the present invention is to provide a mineral dewatering device, after the available mineral reducing mechanism of mineral cuts up in advance, recycle the stickness that microwave compounding device reduced mineral to further refine the particle diameter of mineral again, get into the rotary furnace heating at last, reduce the water content by a wide margin.

The technical means adopted by the utility model are as follows.

An embodiment of the mineral dewatering apparatus of the present invention comprises a mineral crushing device, a first microwave mixing device and a rotary kiln. The mineral crushing device comprises a crushing piece, and the crushing piece is used for crushing the mineral to enable the particle size of the mineral before entering the mineral crushing device to be larger than the particle size of the mineral after leaving the mineral crushing device. The first microwave mixing device comprises a first microwave cavity, a first conveying piece and a plurality of first microwave generating pieces, wherein the first microwave generating pieces generate microwaves and emit the microwaves into the first microwave cavity, and the first conveying piece is arranged in the first microwave cavity and conveys minerals to the discharge hole from the feed port of the first microwave cavity. The rotary furnace comprises a rotary furnace body and a heater, the mineral enters the rotary furnace body and rotates along with the rotary furnace body, and the heater heats the mineral inside the rotary furnace body. The mineral sequentially passes through the mineral crushing device, the first microwave mixing device and the rotary furnace, and the water content of the mineral is reduced from the range of 30% to 35% to the range of 12% to 17%.

The utility model discloses produced beneficial effect: the utility model discloses a mineral dewatering equipment, it utilizes microwave compounding device to produce the microwave postirradiation to mineral, reduces the stickness of ore soil, and make mineral further refine, make the structure of mineral loose, make the total surface area of ore soil increase on the one hand, on the other hand weakening ore soil is to the holding power of moisture, make at the in-process of follow-up rotary kiln heating, the heated area of mineral increases, and moisture breaks away from ore soil easily moreover, makes the moisture in the mineral evaporate easily, and reduces the water content by a wide margin.

Drawings

Fig. 1 is a perspective view of an embodiment of the first microwave mixing device or the second microwave mixing device of the present invention.

Fig. 2 is a top view of the first microwave mixing device or the second microwave mixing device of fig. 1.

Fig. 3 is a front view of the first microwave mixing device or the second microwave mixing device of fig. 1.

Fig. 4 is a cross-sectional view of the first microwave mixing device or the second microwave mixing device of fig. 1.

Fig. 5 is a schematic diagram of the first microwave mixing device or the second microwave mixing device in fig. 1 for performing microwave mixing treatment on minerals.

Fig. 6 is a rear view of the first microwave mixing device or the second microwave mixing device of fig. 1.

Fig. 7 is an enlarged view of a microwave generating part of the first microwave mixing device or the second microwave mixing device of fig. 1.

Fig. 8 is a cross-sectional view of another embodiment of the first microwave mixing device or the second microwave mixing device.

Fig. 9 is a cross-sectional view of yet another embodiment of the first microwave mixing device or the second microwave mixing device.

Fig. 10 is a schematic view of an embodiment of a mineral dewatering apparatus of the present invention.

FIG. 11 is a schematic view of an embodiment of a rotary kiln of the mineral dewatering apparatus of FIG. 10.

FIG. 12 is a graph of the distance of the interior of the rotary furnace of FIG. 11 from the feed inlet versus temperature.

Fig. 13 is a schematic view of a rotary kiln of the mineral dewatering apparatus of fig. 10 heating minerals.

FIG. 14 is a schematic view of minerals being processed by the mineral dewatering apparatus according to one embodiment of the present invention.

FIG. 15 is a schematic view of another embodiment of a mineral dewatering process performed by the mineral dewatering apparatus of the present invention.

Fig. 16 is a flow chart of an embodiment of a mineral dewatering process according to the present invention.

Description of the figure numbers:

10: microwave mixing device

11: microwave cavity

12: microwave generating element

13: conveying member

16: voltage transformation device

17: drive device

18: first base

19: water-cooled system

20: mineral crushing device

30: first microwave mixing device

40: rotary furnace

41: rotary furnace body

42: heating device

43: roller wheel

44: second base

50: second microwave mixing device

60: feeding device

70: conveying device

80: transport device

100: mineral dewatering equipment

111: feed inlet

112: discharge port

113: feed hopper

115: air inlet

116: exhaust port

117: airflow generating member

131: shaft body

132: spiral plate

181: supporting frame

182: bearing plate

183: working ladder

191: water inlet pipe

192: drain pipe

193: auxiliary pipe

194: valve body

195: flexible pipe

411: feed inlet

412: discharge port

B: bearing assembly

S1: providing raw soil

S2: feeding step

S3: a crushing step

S4: first microwave material mixing step

S5: second microwave material mixing step

S6: heating step

S7: and (5) conveying.

Detailed Description

Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, which illustrate an embodiment of the first microwave mixing device or the second microwave mixing device according to the present invention. The microwave mixing device 10 of the present invention includes a microwave cavity 11, a plurality of microwave generators 12 and a conveyor 13.

The microwave cavity 11 is a hollow cavity having a feeding hole 111 and a discharging hole 112. The feed port 111 and the discharge port 112 are respectively disposed at two opposite ends of the microwave cavity 11. The feed opening 111 has a feed hopper 113, the feed hopper 113 is directed upwards, and the mineral is guided by the feed hopper 113 through the feed opening 111 into the microwave cavity 11. The discharge port 112 faces the lower part of the microwave cavity 11, and the microwave-treated minerals leave the microwave cavity 11 from the discharge port 112. As used herein, "above" refers to a direction away from the ground, and "below" refers to a direction toward the ground.

As shown in fig. 1 and 2, the microwave generating members 12 are inserted into the outer shell of the microwave cavity 11, each microwave generating member 12 has a microwave emitting end, the microwave emitting end is located in the microwave cavity 11, the microwave emitting end emits microwaves, and the microwaves irradiate the minerals transported to the microwave cavity 11, and since the microwave cavity 11 of the present embodiment is made of metal, the microwaves can be reflected by the microwave cavity 11 continuously and repeatedly irradiate the minerals. In this embodiment, the microwave cavity 11 is a polygonal cavity, as shown in fig. 1, twelve rectangular metal plates are arranged in pairs along an external cylindrical surface to form a cylindrical structure in the microwave cavity 11, and in the six rectangular metal plates at the upper half (180 degrees), two rows of hole sites are arranged on each rectangular metal plate, so that there are 12 rows of hole sites, and each hole site is provided with one microwave generating element 12. In the present embodiment, the microwave generating member 12 is a magnetron (magnetron). The magnetron has a central cathode, an anode surrounding the central cathode, and magnets disposed at axial ends of the cathode and the anode, applies a high voltage between the cathode and the anode, heats the cathode to dissociate thermal electrons and move in an electric field space between the cathode and the anode, generates microwaves in a resonant cavity between the cathode and the anode in cooperation with magnetic fields generated by the magnets at the two ends, and emits the generated microwaves into the microwave cavity 11 through an antenna at a microwave emitting end. Since the magnetron requires a high voltage, a plurality of voltage transformation devices 16 are disposed at both sides of the outside of the microwave cavity 11 to transform the voltage (110V or 220V) of the commercial power into a high voltage (4000V) required by the magnetron.

As shown in fig. 4, the conveying element 13 is disposed in the microwave cavity 11, and the conveying element 13 of this embodiment is a spiral device, which includes a shaft 131 and a spiral plate 132, wherein the spiral plate 132 is disposed along an axial direction of the shaft 131. Both ends of the shaft body 131 are rotatably supported by bearings B, respectively. Referring to fig. 1 and fig. 3, one end of the shaft 131 is connected to a driving device 17, and the driving device 17 drives the shaft 131 to rotate so as to rotate the spiral plate 132. In the present embodiment, the driving device 17 is an electric motor. An output shaft of the driving device 17 is connected to the shaft body 131 through a coupling, so that the driving device 17 drives the shaft body 131 to rotate.

Referring to fig. 4 and 6, a plurality of air inlets 115 are disposed at an end of the microwave cavity 11 close to the discharge port 112, an air outlet 116 is disposed at an end of the microwave cavity 11 close to the feed hopper 113, and a plurality of air flow generating members 117 are disposed at the air inlets 115.

As shown in fig. 1, fig. 2 and fig. 3, the microwave cavity 11, the microwave generating element 12, the conveying element 13, the transforming device 16 and the driving device 17 are disposed on a first base 18. The first base 18 includes a supporting frame 181, a plurality of loading plates 182, and a working ladder 183. As shown in fig. 3, in order to smoothly convey the minerals in the microwave chamber 11, the supporting frame 181 is disposed to have an inclination angle with respect to the ground, and is inclined downward from the feeding port 111 to the discharging port 112. In this way, in addition to the mineral being pushed by the conveying member 13 to advance from the inlet 111 towards the outlet 112, the mineral can also be conveyed from the inlet 111 towards the outlet 112 by gravity using the inclined support frame 181. As shown in fig. 1 and 2, the carrier plate 182 is disposed between the microwave cavity 11 and the transformer 16 and on both sides of the driving device 17, the working ladder 183 is erected on one side of the supporting frame 181, and an operator can climb up to the carrier plate 182 via the working ladder 183 for maintenance or operation.

As shown in fig. 5, after the mineral particles are fed into the feeding hopper 113, the mineral particles are guided by the feeding hopper 113 to enter the microwave cavity 11 through the feeding port 111, the conveying member 13 disposed in the microwave cavity 11 pushes the mineral particles to move forward along the axial direction, and the microwave generating member 12 generates microwaves and emits the microwaves into the microwave cavity 11 to irradiate the mineral particles. The microwave rotates water molecules in the mineral material particles to generate oscillation of the mineral molecules, thereby raising the temperature of the mineral material particles. As the temperature rises, part of the water and the dust of the mineral material particles rise to be suspended in the microwave cavity 11, and the air flow generated in the microwave cavity 11 by the air flow generating member 117 discharges the water, the dust and the like through the exhaust port 116. After the microwave irradiation, the mineral particles not only reduce the water content, but also loosen the structure of the mineral particles, reduce the viscosity of the mineral particles, and crack the mineral particles into particles with smaller particle size.

As shown in fig. 7, the microwave generating member 12 of the present embodiment is a magnetron whose anode is cooled using a water cooling system 19. The water cooling system 19 includes a water inlet pipe 191 and a water outlet pipe 192, the water inlet pipe 191 and the water outlet pipe 192 are provided with a plurality of sub pipes 193, each sub pipe 193 is provided with a valve body 194 and connected to the microwave generating member 12 through a hose 195, a water jacket surrounds the anode of the microwave generating member 12, cooling water passes through the water jacket from the water inlet pipe 191 through the sub pipe 193, the valve body 194 and the hose 195, and after absorbing heat generated by the anode, the cooling water with increased temperature enters the water outlet pipe 192 through the hose 195, the valve body 194 and the sub pipe 193.

Fig. 8 shows another embodiment of the first microwave mixing device or the second microwave mixing device of the present invention. In the present embodiment, the microwave generating members 12 are staggered with each other on the microwave cavity 11.

Fig. 9 shows yet another embodiment of the first microwave mixing device or the second microwave mixing device of the present invention. In the present embodiment, the microwave generators 12 are arranged relatively closely (with a small pitch) on the rectangular metal plates near the top of the microwave cavity 11, while the microwave generators 12 are arranged relatively loosely (with a large pitch) on the rectangular metal plates near the bottom of the microwave cavity 11.

Please refer to fig. 10, fig. 11, fig. 14, and fig. 15, which illustrate an embodiment of a mineral dewatering apparatus according to the present invention. The mineral dewatering apparatus 100 of the present invention includes a mineral crushing device 20, a first microwave mixing device 30 and a rotary kiln 40. The mineral dewatering equipment of this embodiment is applicable to the high stickness and the high moisture content's of ore deposit (laterite type bauxite, nickel soil ore). The water content of the mined ore from the mine site is 30% to 35%.

The mineral is conveyed to a mineral breaker apparatus 20. the mineral breaker apparatus 20 includes breaker elements which break the mineral so that the particle size of the mineral before it enters the mineral breaker apparatus 20 is greater than the particle size of the mineral after it exits the mineral breaker apparatus 20. In this embodiment, the mineral breaker apparatus 20 is a crusher, which may be a single-shaft, twin-shaft or four-shaft crusher. After the minerals are crushed by the mineral crushing device 20, material particles with the particle size smaller than 20 cm are formed, and the material particles are evenly discharged and conveyed to the first microwave mixing device 30.

The first microwave mixing device 30 may be a microwave mixing device as shown in fig. 1 to 9. The first microwave mixing device 30 includes a first microwave cavity (e.g., the microwave cavity 11), a first conveying member (e.g., the conveying member 13), and a plurality of first microwave generating members (e.g., the microwave generating members 12), wherein the first microwave generating members generate microwaves and emit the microwaves into the first microwave cavity, and an output power of the first microwave mixing device is in a range from 100 kw to 140 kw. The first conveying member is disposed in the first microwave cavity, and conveys minerals from a feeding port (e.g., the feeding port 111) to a discharging port (e.g., the discharging port 112) of the first microwave cavity. The first microwave mixing device 30 allows the minerals to pass through the first microwave mixing device 30, so that the temperature of the minerals can be raised by microwaves to remove partial moisture, the moisture content is slightly reduced to 31%, bonding of crystal water is broken to destroy the viscosity of the minerals, organic matters in the mineral soil are decomposed and are not intertwined, the particle size of the minerals is reduced, and the minerals form particles with the particle size of less than 4 centimeters when being output by the first microwave mixing device 30.

As shown in fig. 11 and 13, the rotary furnace 40 includes a rotary furnace body 41 and a heater 42, mineral enters the rotary furnace body 41 and rotates along with the rotary furnace body 41, and the heater 42 heats the mineral located inside the rotary furnace body 41. The rotary furnace body 41 has rollers 43 below, the rollers 43 are driven by a motor to rotate, and the rotary furnace body 41 is supported by the rollers 43 and rotates along with the rollers 43. The rollers 43 are disposed on a second base 44, and the second base 44 is disposed at an inclined angle with respect to the ground, so that the minerals can move in the rotary furnace 41 by gravity for transportation. The height of the feed opening 411 of the rotary furnace body 41 relative to the ground is greater than the height of the discharge opening 412 of the rotary furnace body 41 relative to the ground. The heater 42 is a diesel oil burner, which is arranged at the end of the rotary furnace body 41, the heater 42 generates flame in the rotary furnace body 41 and heats the mineral moving in the rotary furnace body 41 to the temperature range of 430 ℃ to 470 ℃ to remove the moisture of the mineral, so that the mineral forms particles with the moisture content of 12 percent to 17 percent and the particle size of less than 1.5 cm after passing through the rotary furnace body 41. Fig. 12 shows that the temperature is highest in the middle part of the rotary furnace body 41 and exceeds 700 ℃, and the temperature at the feed inlet 411 and the discharge outlet 412 is lowest and is between 200 ℃ and 300 ℃.

As shown in fig. 10 and 14, the mineral dewatering apparatus 100 of the present invention further includes a second microwave mixing device 50, the mineral material particles processed by the first microwave mixing device 30 are conveyed to the second microwave mixing device 50, and the second microwave mixing device 50 may be the microwave mixing device shown in fig. 1 to 11. The second microwave mixing device 50 includes a second microwave cavity (e.g., the microwave cavity 11), a second conveying member (e.g., the conveying member 13), and a plurality of second microwave generating members (e.g., the microwave generating members 12), wherein the second microwave generating members generate microwaves and emit the microwaves into the second microwave cavity, and an output power of the second microwave mixing device is in a range from 60 kw to 100 kw. The second conveying member is disposed in the second microwave chamber, and conveys minerals from a feeding port (e.g., the feeding port 111) to a discharging port (e.g., the discharging port 112) of the second microwave chamber. The second microwave mixing device 50 allows the minerals to pass through the second microwave mixing device 50, and the temperature of the minerals is increased by the microwaves to remove part of the moisture again, so that the moisture content is slightly reduced to 30%, and the bonding of crystal water is broken to destroy the viscosity of the minerals, and the particle size of the minerals is reduced, so that the minerals form particles with the particle size of less than 4 cm when being output through the second microwave mixing device 50. The minerals are irradiated with microwaves by the second microwave mixing device 50 and then conveyed to the rotary kiln 40.

The soil body water evaporation rate coupling model is shown as the following two relations:

E_w＝(ΔR_n+γE_aw)/(Δ+γA)

E_aw＝0.35(1+0.146u_w)e_aw(B-A)

wherein E_wAs the evaporation rate (mm/day), Δ is the slope of the relationship between the saturated vapor pressure and the temperature, R_nIs net radiation (W/m)²) And gamma is a dry-wet table constant (kPa/DEG C), and u is_wIs the wind speed (km/hr), e_awThe vapor pressure (mm-Hg) of the soil surface is shown, A is the reciprocal of the relative humidity of air, and B is the reciprocal of the relative humidity of the soil surface. The utility model discloses a mineral dewatering equipment 100 is when the device of each processing stage is handled the mineral, and the comparison of the theoretical value (the data that utilize foretell soil body water evaporation rate coupled model to calculate) and the experimental value (the data when actually executing the operation) of the water content of mineral in each stage is as follows:

fig. 15 shows another embodiment of the mineral dewatering apparatus 100 of the present invention. This embodiment has partially the same structure as the embodiment of fig. 14, and the same elements are given the same reference numerals and explanations thereof are omitted. The difference between this embodiment and the embodiment of fig. 14 is that the embodiment further includes a feeding device 60 and a conveying device 70, and the minerals are fed into the feeding device 60 by the excavator, so as to avoid impact on the equipment caused by directly feeding the minerals into the mineral crushing device 20. The mineral is conveyed from the feeding device 60 to the mineral crushing device 20. In this embodiment, the feeding device 60 may be a vibrating feeder, and the conveying device 70 may be a conveyer belt, and the minerals heated by the rotary kiln 40 are conveyed by the conveying device 70 to a transport device 80, such as a cargo ship or a truck.

Fig. 16 shows an embodiment of a mineral dewatering process of the present invention, which includes: a raw soil providing step S1, a crushing step S3, a first microwave mixing step S4 and a heating step S6. In this embodiment, the mineral dewatering process of the present invention further includes a second microwave mixing step S5. In this embodiment, the mineral dewatering process of the present invention further includes a feeding step S2. In this embodiment, the mineral dewatering process of the present invention further includes a conveying step S7.

In step S1, it provides step S1 for the original soil: providing raw mineral soil with a first water content. In this example, the raw mineral soil is a highly viscous and high-water-content mineral soil (laterite-type bauxite and nickel-soil ore). The water content of the mined ore from the mine site is 30% to 35%. The process then proceeds to step S2.

In step S2, it is a feeding step S2: the raw ore soil is fed into the feeding device 60 and is transported to the mineral crushing device 20 through the feeding device 60. The process then proceeds to step S3.

In step S3, it is a crushing step S3: the raw mineral soil is crushed by the mineral crushing apparatus 20. The mineral crushing device 20 is a crusher, and after the minerals are crushed by the mineral crushing device 20, material particles with the particle size of less than 20 centimeters are formed and are discharged evenly. The process then proceeds to step S4.

In step S4, it is a first microwave mixing step S4: the viscosity of the cut minerals is reduced and the minerals are further crushed by a first microwave mixing device 30, so that the water content is slightly reduced to 31%, bonding of crystal water is broken to destroy the viscosity of the minerals, the particle size of the minerals is reduced, and the minerals form particles with the particle size of less than 4 cm when being output by the first microwave mixing device 30. The process then proceeds to step S5.

In step S5, it is a second microwave mixing step S5: the mineral processed in the first microwave step is subjected to viscosity reduction and further pulverization by the second microwave mixing device 50. The water content is slightly reduced to 30%, the viscosity of the minerals is further destroyed, the particle size of the minerals is reduced, and the minerals form particles with the particle size of less than 4 cm when being output through the second microwave mixing device 50. The process then proceeds to step S6.

In step S6, it is a heating step S6: the crushed mineral is heated by the rotary furnace 40 to remove water and further crushed to obtain a mineral material pellet, wherein the mineral material pellet has a second water content. The rotary furnace body 41 of the rotary furnace 40 rotates to turn over the minerals, and the heater 42 generates flames in the rotary furnace body 41 to heat the minerals in the rotary furnace body 41 to remove moisture to obtain mineral material particles. The second moisture content is in the range of 12% to 17%. The process then proceeds to step S7.

In step S7, conveyance step S7: the mineral particles are transported to a transport means 80 via the above-mentioned transport device 70.

The utility model discloses a mineral dewatering equipment and processing procedure, it utilizes microwave compounding device to produce the microwave after-irradiation to mineral, reduces the stickness of ore soil, and make mineral further refine, make the structure of mineral loose, make the total surface area of ore soil increase on the one hand, on the other hand weakening ore soil is to the holding power of moisture, make at the in-process of follow-up rotary kiln heating, the area of heating of mineral increases, moisture breaks away from ore soil easily moreover, make the moisture in the mineral evaporate easily, and reduce the water content by a wide margin.

Claims

1. Mineral dewatering apparatus for reducing the water content of a mineral, characterised in that the mineral dewatering apparatus (100) comprises:

a mineral comminution apparatus (20) including comminution means for comminuting the mineral to a particle size which is greater before the mineral enters the mineral comminution apparatus (20) than after the mineral exits the mineral comminution apparatus (20);

a first microwave mixing device (30) which comprises a first microwave cavity, a first conveying piece and a plurality of first microwave generating pieces, wherein the first microwave generating pieces generate microwaves and emit the microwaves into the first microwave cavity, and the first conveying piece is arranged in the first microwave cavity and conveys the minerals from a feeding hole of the first microwave cavity to a discharging hole;

a rotary furnace (40) including a rotary furnace body (41) and a heater (42), the mineral entering the rotary furnace body (41) and rotating with the rotary furnace body (41), the heater (42) heating the mineral inside the rotary furnace body (41);

wherein the mineral passes through the mineral crushing device (20), the first microwave mixing device (30) and the rotary furnace (40) in sequence, and the water content of the mineral is reduced from the range of 30% to 35% to the range of 12% to 17%.

2. The mineral dewatering apparatus of claim 1, including a second microwave mixing device (50) including a second microwave chamber, a second conveyor member and a plurality of second microwave generating members, the plurality of second microwave generating members generating microwaves and emitting the microwaves into the second microwave chamber, the second conveyor member being disposed in the second microwave chamber and conveying the minerals from the feed inlet to the discharge outlet of the second microwave chamber, the minerals passing through the mineral crushing device (20), the first microwave mixing device (30), the second microwave mixing device (50) and the rotary oven (40) in sequence.

3. The mineral dewatering apparatus of claim 2, characterized in that the second conveying member of the second microwave mixing apparatus (50) is a screw member extending in the axial direction of the second microwave chamber.

4. The mineral dewatering apparatus of claim 2, characterized in that the mineral is formed into pellets having a particle size of less than 4 cm by the first microwave mixing device (30) and the second microwave mixing device (50).

5. The mineral dewatering apparatus of claim 2, characterized in that the output power of the first microwave mixing device (30) is in the range of 100 kilowatts to 140 kilowatts and the output power of the second microwave mixing device (50) is in the range of 60 kilowatts to 100 kilowatts.

6. The mineral dewatering apparatus of claim 1, characterized in that the first conveying member of the first microwave mixing device (30) is a screw member extending in the axial direction of the first microwave cavity.

7. The mineral dewatering apparatus of claim 1, characterized in that the heater (42) of the rotary kiln (40) is a burner.

8. The mineral dewatering apparatus of claim 5, wherein the rotary furnace (40) heats the mineral to a temperature in the range of 430 ℃ to 470 ℃.

9. The mineral dewatering apparatus of claim 1, characterized in that the rotary furnace body (41) of the rotary furnace (40) has an angle of inclination with respect to the ground, the height of the feed opening (411) of the rotary furnace body (41) with respect to the ground being greater than the height of the discharge opening (412) of the rotary furnace body (41) with respect to the ground.

10. The mineral dewatering apparatus of claim 1, characterized in that the mineral is shredded by the mineral comminution means (20) into particles having a size of less than 20 cm.

11. The mineral dewatering apparatus of claim 1, including an inlet means (60) and a conveyor means (70), the mineral being conveyed to the mineral reducing means (20) via the inlet means (60), the mineral heated by the rotary kiln (40) being conveyed to a conveyor means (80) via the conveyor means (70).