A rare earth concentrate acid leaching tank

Abstract

The application discloses a rare earth concentrate acid dissolving tank, which comprises an acid storage tank, a slurry mixing tank, a mixer, an acid dissolving tank body, the mixer is provided with an outer pipe and an inner pipe, one end of the inner pipe is inserted into the outer pipe from the outside, the other end of the inner pipe is connected with the slurry mixing tank through a pipeline, the outer pipe is installed on the upper portion of the acid dissolving tank body, the lower end of the outer pipe is communicated with the acid dissolving tank body, the upper end of the outer pipe is connected with the acid storage tank, the upper portion of the acid storage tank is provided with a top cover, an opening is arranged on the top cover, a defoaming plate is arranged at the opening position and covers the lower portion of the opening of the top cover. The rare earth concentrate slurry and the hydrochloric acid solution are mixed by using the mixer first, then are fed into the acid dissolving tank body, so that the mixing is more uniform, meanwhile, the heat exchange pipe is used for heat exchange in the tank during the reaction, the temperature is reduced, the solution is prevented from boiling, the defoaming plate can block the foam generated in the reaction, the overflow of the foam from the reaction tank is avoided, and the normal operation of the acid dissolving is influenced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rare earth extraction, and particularly relates to a rare earth concentrate acid-dissolution tank. BACKGROUND

[0002] Before rare earth extraction, hydrochloric acid is used to dissolve rare earth concentrate, so that a chlorinated rare earth aqueous solution is generated, facilitating subsequent extraction. A patent application No. 201720179901.0 discloses an acid-dissolution reaction tank for rare earth processing, which comprises a tank body, a tank cover, a glass steel reaction tank and a stirring mechanism. The glass steel reaction tank is installed in the tank body. The tank cover is provided with a feeding opening and a waste gas discharge opening. The tank cover is provided with a stirring motor. The stirrer is arranged in the glass steel reaction tank. The stirrer comprises a stirring shaft and a stirring component. The stirring shaft is connected with the stirring motor. The acid-dissolution reaction tank has the structure commonly used at present. During acid-dissolution, the rare earth concentrate is poured into the tank, and hydrochloric acid is added and stirred. The main component of the rare earth concentrate is rare earth carbonate. Gas is generated during the reaction. The reaction is an exothermic reaction. Severe reaction can cause foam and even boiling in the tank, so that the foam is discharged from the tank, affecting production. Therefore, a rare earth concentrate acid-dissolution tank is needed, which can heat the solution in the tank through heat exchange pipes during acid-dissolution, and a defoaming plate is arranged at the opening to prevent the foam from being discharged from the upper part of the acid-dissolution tank, so as to ensure the smooth production. SUMMARY

[0003] To solve the above technical problems, the present application provides a rare earth concentrate acid-dissolution tank, which can solve the problem that the existing technology is prone to foam and affects production.

[0004] The present application is implemented by the following technical solutions.

[0005] The rare earth concentrate acid-dissolution tank provided by the present application comprises an acid storage tank, a slurry mixing tank, a mixer, an acid-dissolution tank body. The mixer is provided with an outer pipe and an inner pipe. One end of the inner pipe is inserted into the outer pipe from the outside. The other end of the inner pipe is connected with the slurry mixing tank through a pipeline. The outer pipe is installed on the upper part of the acid-dissolution tank body. The lower end of the outer pipe is in communication with the acid-dissolution tank body. The upper end of the outer pipe is connected with the acid storage tank. The upper part of the acid-dissolution tank body is provided with a top cover. The top cover is provided with an opening. A defoaming plate is arranged at the opening position and covers the lower part of the opening of the top cover.

[0006] The acid-dissolution tank body is provided with a stirring motor and a stirring paddle. The stirring motor is installed on the top cover. The upper end of the stirring paddle is connected with the stirring motor. The lower end of the stirring paddle extends to the bottom of the acid-dissolution tank body.

[0007] The bottom of the acid-dissolution tank body is provided with an inclination of 3° to 5°. The lowest point of the bottom of the acid-dissolution tank body is provided with a residue discharge valve.

[0008] The acid dissolving tank body is provided with heat exchange pipes, both ends of the heat exchange pipes are located outside the acid dissolving tank body, the middle part of the heat exchange pipes is located inside the acid dissolving tank body, and the middle part of the heat exchange pipes is bent in an S shape or mosquito coil shape inside the acid dissolving tank body.

[0009] The water storage pool is further connected with both ends of the heat exchange pipes, and one end of the heat exchange pipes is provided with a circulating pump.

[0010] The defoaming plate is a glass fiber plate or a plastic plate, and a plurality of through holes with a diameter of 2mm to 10mm are arranged on the defoaming plate.

[0011] The negative pressure fan is further communicated with the upper part of the acid dissolving tank body through the air suction pipeline, and the inlet of the air suction pipeline is located on the upper part of the defoaming plate.

[0012] The material of the heat exchange pipes is B series or C series of Hastelloy.

[0013] The horizontal height of the acid storage tank and the mixing pool is higher than that of the acid dissolving tank body.

[0014] The lower end of the inner pipe is closed, and a plurality of through holes are arranged on the side wall of the inner pipe.

[0015] The beneficial effects of the present application are that: by using the mixer to mix the rare earth concentrate slurry and hydrochloric acid solution first, then entering the acid dissolving tank body, the mixing is more uniform, and at the same time, the heat exchange pipe is used for heat exchange in the tank during the reaction, the temperature is reduced, the solution is prevented from boiling, the defoaming plate can block the foam generated in the reaction, avoid the overflow of the foam from the reaction tank, and affect the normal operation of the acid dissolving. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present application;

[0017] In the figure: 1-acid storage tank, 2-mixing pool, 3-mixer, 4-acid dissolving tank body, 5-outer pipe, 6-inner pipe, 7-defoaming plate, 8-top cover, 9-stirring motor, 10-stirring paddle, 11-discharge valve, 12-heat exchange pipe, 13-water storage pool, 14-circulating pump, 15-negative pressure fan. DETAILED DESCRIPTION

[0018] The technical solutions of the present application are further described below, but the scope of protection is not limited to the description.

[0019] For example, Figure 1As shown, a rare earth concentrate acid tank, comprising an acid storage tank 1, a mixing tank 2, a mixer 3, an acid tank body 4, the mixer 3 is provided with an outer tube 5 and an inner tube 6, one end of the inner tube 6 is inserted into the outer tube 5 from the outside, the other end of the inner tube 6 is connected with the mixing tank 2 through a pipeline, the outer tube 5 is installed on the upper part of the acid tank body 4, and the lower end of the outer tube 5 is communicated with the acid tank body 4, the upper end of the outer tube 5 is connected with the acid storage tank 1, the upper part of the acid tank body 4 is provided with a top cover 8, the top cover 8 is provided with an opening, a defoaming plate 7 is arranged at the opening position, and the defoaming plate 7 is covered below the opening of the top cover 8.

[0020] When producing, the rare earth concentrate powder is poured into the mixing tank 2, water is stirred to form a paste, then under the action of gravity, the slurry in the mixing tank 2 and hydrochloric acid in the acid storage tank 1 enter the mixer 3, the slurry flows out of the inner tube 6 and reacts with the hydrochloric acid in the outer tube 5, and because the concentration of hydrochloric acid in the outer tube 5 is the highest, the reaction speed is the fastest at this time, after reaction, the solution falls into 4 from the mixer 3, and the solution contacts with air during falling, which can be partially cooled by air, the slurry and hydrochloric acid continue to react in the acid tank body 4, and then continue to release heat outward, at this time, cooling water is introduced into the heat exchange tube 12 through the circulating pump 14 to absorb the heat in the acid tank body 4, reduce the temperature in the tank, avoid boiling of the solution, and at the same time, the defoaming plate 7 is arranged at the opening position of the top cover 8, when the foam in the tank rises to the opening position, the foam smaller than the holes of the defoaming plate 7 will be broken when passing through the defoaming plate 7, the broken liquid droplets gather at the lower part of the defoaming plate 7 and return to the acid tank body 4, achieving the purpose of reducing overflow of the foam from the opening position, in the acid tank body 4, the rare earth carbonate in the rare earth concentrate reacts into rare earth chloride solution, which can enter the next processing procedure after static precipitation.

[0021] The acid tank body 4 is provided with a stirring motor 9 and a stirring paddle 10, the stirring motor 9 is installed on the top cover 8, the upper end of the stirring paddle 10 is connected with the stirring motor 9, and the lower end of the stirring paddle 10 extends to the bottom of the acid tank body 4, after the stirring motor 9 and the stirring paddle 10 are started, the solution in the acid tank body 4 can be stirred, the slurry reaction is uniform, and boiling caused by local high temperature in the acid tank body 4 is avoided.

[0022] The acid tank body 4 is provided with a stirring motor 9 and a stirring paddle 10, the stirring motor 9 is installed on the top cover 8, the upper end of the stirring paddle 10 is connected with the stirring motor 9, and the lower end of the stirring paddle 10 extends to the bottom of the acid tank body 4, after the stirring motor 9 and the stirring paddle 10 are started, the solution in the acid tank body 4 can be stirred, the slurry reaction is uniform, and boiling caused by local high temperature in the acid tank body 4 is avoided.

[0023] The bottom of the acid tank body 4 is provided with a slope of 3° to 5°, and the lowest point of the bottom of the acid tank body 4 is provided with a residue discharge valve 11, part of the insoluble substances in the rare earth concentrate can be discharged from the residue discharge valve 11 through flushing, and the slope of 3° to 5° facilitates the insoluble substances to gather at the low place during residue discharge.

[0024] The acid dissolving tank body 4 is provided with heat exchange pipes 12, both ends of the heat exchange pipes 12 are located outside the acid dissolving tank body 4, the middle part of the heat exchange pipes 12 is located inside the acid dissolving tank body 4, and the middle part of the heat exchange pipes 12 is bent in an S shape or mosquito coil shape inside the acid dissolving tank body 4, the heat exchange pipes 12 adopt a contact heat exchange mode, and contact heat exchange is carried out by passing cooling water and high-temperature acid in the acid dissolving tank body 4, so that the temperature is reduced.

[0025] Further comprising a water storage tank 13, the water storage tank 13 is connected with both ends of the heat exchange pipes 12, and one end of the heat exchange pipes 12 is provided with a circulating pump 14, the water storage tank 13 is used for storing cooling water, which can facilitate the temperature reduction of the acid dissolving tank body 4, and the cooling water in the water storage tank 13 can also be used for molten salt operation in other processes, and water with high temperature can improve the dissolution speed.

[0026] The defoaming plate 7 is a glass fiber plate or a plastic plate, a plurality of through holes with a diameter of 2mm to 10mm are arranged on the defoaming plate 7, when the foam in the tank rises to the opening position, the foam smaller than the holes of the defoaming plate 7 is broken when passing through the defoaming plate 7, the broken liquid droplets are gathered at the lower part of the defoaming plate 7 and flow back to the acid dissolving tank body 4, so that the overflow of the foam from the opening position is reduced.

[0027] Further comprising a negative pressure fan 15, the negative pressure fan 15 is communicated with the upper part of the acid dissolving tank body 4 through a suction duct, and the inlet of the suction duct is located at the upper part of the defoaming plate 7, during high-temperature reaction, hydrogen chloride is volatilized from hydrochloric acid, which has a pungent smell, the negative pressure fan 15 can keep the acid dissolving tank body 4 in a negative pressure state, so as to avoid the volatilization and ensure the safety of workers.

[0028] The material of the heat exchange pipes 12 is a B series or C series of Hastelloy alloy, the B series or C series of Hastelloy alloy has good corrosion resistance in high-temperature and high-concentration hydrochloric acid solution, so as to improve the service life of the heat exchange pipes 12.

[0029] The horizontal height of the acid storage tank 1 and the slurry mixing tank 2 is higher than that of the acid dissolving tank body 4, so that the hydrochloric acid in the acid storage tank 1 and the ore slurry in the slurry mixing tank 2 can enter the acid dissolving tank body 4 by gravity.

[0030] The lower end of the inner pipe 6 is closed, a plurality of through holes are arranged on the side wall of the inner pipe 6, so that the ore slurry and the hydrochloric acid are uniformly and gently mixed in the mixer 3, and the reaction speed is improved.

Claims

1. A rare earth concentrate acid dissolution tank, characterized in that: The system includes an acid storage tank (1), a slurry mixing tank (2), a mixer (3), and an acid dissolving tank body (4). The mixer (3) is provided with an outer pipe (5) and an inner pipe (6). One end of the inner pipe (6) is inserted into the outer pipe (5) from the outside, and the other end of the inner pipe (6) is connected to the slurry mixing tank (2) through a pipe. The outer pipe (5) is installed on the upper part of the acid dissolving tank body (4), and the lower end of the outer pipe (5) is connected to the acid dissolving tank body (4). The upper end of the outer pipe (5) is connected to the acid storage tank (1). The acid dissolving tank body (4) is provided with a top cover (8) on the upper part. The top cover (8) has an opening, and a defoaming plate (7) is provided at the opening position. The defoaming plate (7) covers the bottom of the opening of the top cover (8). The acid dissolving tank body (4) is provided with a heat exchange tube (12). The two ends of the heat exchange tube (12) are located outside the acid dissolving tank body (4), and the middle part of the heat exchange tube (12) is located inside the acid dissolving tank body (4). The middle part of the heat exchange tube (12) is bent in an S-shape or a mosquito coil shape inside the acid dissolving tank body (4). It also includes a negative pressure fan (15), which is connected to the upper part of the acid dissolving tank body (4) through a suction pipe, and the inlet of the suction pipe is located on the upper part of the defoaming plate (7); The lower end of the inner tube (6) is closed, and multiple through holes are provided on the side wall of the inner tube (6).

2. The rare earth concentrate acid dissolution tank as described in claim 1, characterized in that: The acid dissolving tank body (4) is equipped with a stirring motor (9) and a stirring paddle (10). The stirring motor (9) is installed on the top cover (8), the upper end of the stirring paddle (10) is connected to the stirring motor (9), and the lower end of the stirring paddle (10) extends to the bottom of the acid dissolving tank body (4).

3. The rare earth concentrate acid dissolution tank as described in claim 1, characterized in that: The bottom of the acid dissolving tank body (4) is inclined at 3° to 5°, and a slag discharge valve (11) is provided at the lowest point of the bottom of the acid dissolving tank body (4).

4. The rare earth concentrate acid dissolution tank as described in claim 1, characterized in that: It also includes a water storage tank (13), which is connected to both ends of the heat exchange tube (12), and one end of the heat exchange tube (12) is equipped with a circulation pump (14).

5. The rare earth concentrate acid dissolution tank as described in claim 1, characterized in that: The defoaming board (7) is a fiberglass board or a plastic board, and the defoaming board (7) has multiple through holes with a diameter of 2 mm to 10 mm.

6. The rare earth concentrate acid dissolution tank as described in claim 1, characterized in that: The heat exchange tube (12) is made of Hastelloy B series or Hastelloy C series.

7. The rare earth concentrate acid dissolution tank as described in claim 1, characterized in that: The horizontal height of the acid storage tank (1) and the slurry mixing tank (2) is higher than the horizontal height of the acid dissolving tank body (4).

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