CN212523721U - Mixing device of rare earth mineral and sulfuric acid - Google Patents
Mixing device of rare earth mineral and sulfuric acid Download PDFInfo
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- CN212523721U CN212523721U CN202020698468.3U CN202020698468U CN212523721U CN 212523721 U CN212523721 U CN 212523721U CN 202020698468 U CN202020698468 U CN 202020698468U CN 212523721 U CN212523721 U CN 212523721U
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Abstract
The utility model discloses a compounding device of tombarthite mineral and sulphuric acid, include: the mixer comprises a frame, a mixer body, a stirring device and a heating device, wherein two ends of the mixer body are respectively fixed on the frame at two sides, the mixer body comprises a cylindrical double-layer shell, and a feed inlet, a discharge outlet and a tail gas outlet are arranged on a shell; the feed inlet and the tail gas outlet are positioned at the upper part of the shell, the feed inlet is positioned at the head end of the shell, and the discharge outlet is positioned at the lower part and at the tail end of the shell; the stirring device comprises: the stirring shaft is positioned in the shell, two ends of the stirring shaft extend out of two ends of the shell respectively and are connected to the rack, and the paddle is connected to the outer wall of the stirring shaft; the motor is fixed on the frame, and a rotating shaft of the motor is connected with the end part of the stirring shaft; the heating device includes: the temperature control system and the heating interlayer are positioned in the double-layer shell. The utility model discloses can effectually prevent that the material from gluing the wall.
Description
Technical Field
The utility model belongs to the hydrometallurgy field, concretely relates to compounding device of tombarthite mineral and sulphuric acid.
Background
The Bayan Obo rare earth mineral is mainly treated by adopting a high-temperature roasting decomposition process (hereinafter referred to as a high-temperature acid method) of concentrated sulfuric acid, and about 10 million tons of concentrate are treated by adopting the process every year. The high-temperature acid method process is that rare earth concentrate and concentrated sulfuric acid are mixed in a mixing chamber for a short time and then are added into a rotary kiln in a slurry state. In the roasting process of the rotary kiln, the temperature rises rapidly, the concentrate reacts with sulfuric acid to generate a large amount of substances such as calcium sulfate (gypsum), iron phosphate and the like, the viscosity of the material is increased continuously, and the material is changed into paste and then solidified, so that the phenomenon of ring formation caused by the fact that the material is stuck to the kiln is formed. At present, the ring formation phenomenon is generally reduced by improving the acid-mineral ratio in the material mixing process, and the ring formation phenomenon is solved by adding excessive sulfuric acid and fully reacting materials at the ring formation position, but the methods increase the consumption of the sulfuric acid.
Under the circumstance, technical personnel in China respectively put forward some technical schemes.
The patent document of the patent name 'energy-saving and efficient sulfuric acid sectional roasting method for rare earth concentrate' (application number: 201510082995.5) mixes rare earth concentrate and concentrated sulfuric acid according to the mass ratio of 1: 1-1.3, carries out granulation through a roller granulator, carries out primary roasting at the temperature of 130-260 ℃ for more than 2 hours, and then enters a secondary roasting kiln for roasting at the temperature of 400-600 ℃ for more than 2 hours. The method adopts a roller granulator to granulate the concentrate to prevent the concentrate from forming rings in the roasting process, but the pellets are easy to be burnt outside and not burnt inside in the roasting process, the rare earth decomposition rate is reduced, and the pellets are low in efficiency in the water leaching process, so that the problems of long leaching time, low rare earth leaching rate and the like are solved. The patent name of 'a mixed rare earth concentrate decomposition method' (application number: 200410006443.8), the method is to mix rare earth concentrate with sulfuric acid according to the weight ratio of 1: 1.1-1.7, to be cured for 8 hours at 40-180 ℃, to be baked for 1-8 hours at 150-330 ℃, to be leached into solution by water, to be extracted and separated. The method strengthens the rare earth decomposition rate through curing, prevents the ring formation phenomenon to a certain extent, recovers thorium through low-temperature roasting, but along with the strict environmental protection policy, even the low-temperature roasting waste residue can not reach the non-radioactive waste residue standard and needs to be specially stored, thorium products do not have an application market at present, and due to the radioactivity problem, the storage cost is higher, the concentrate curing time is too long, and the production efficiency is seriously reduced.
The patent document of the patent name 'a process method for preventing the ring formation of a rotary kiln' (application number: 201310153170.9) discloses that a material returning hole is arranged at the low-temperature section of the rotary kiln, a material returning hole is arranged at the high-temperature section, the material returning hole is connected with the material returning hole through a pipeline, part of roasted ore enters the pipeline through the material returning hole at the high-temperature section and returns to the material returning hole, and the roasted ore enters the low-temperature section to be mixed with acid ore materials to be continuously roasted. The method has high operation continuity and controllability, but part of roasted ore is repeatedly roasted every time, so that the roasted ore is easy to be roasted and the production efficiency is reduced.
The patent document of a patent of 'a method for preparing mixed rare earth chloride from bayan obo rare earth concentrate' (application number: 201811249616.7) is to mix rare earth concentrate and concentrated sulfuric acid according to a mass ratio of 1: 0.7-1.5 to carry out three-stage roasting, wherein the first-stage roasting temperature is 100-150 ℃, the time is 0.5-1 hour, the second-stage roasting temperature is 150-200 ℃, the time is 1-2 hours, the third-stage roasting temperature is 400-500 ℃, the time is 1-2 hours, the first-stage roasting ensures that a liquid phase state avoids material from sticking to a kiln, and after the first-stage roasting, the low temperature is controlled to avoid that the viscosity is greatly increased to cause sticking to the kiln.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a tombarthite mineral and sulphuric acid's compounding device has solved tombarthite mineral and sulphuric acid mixing process and has taken place the problem of gluing the wall and forming a ring on the reactor surface to effectively improve mineral decomposition rate at the compounding in-process.
The technical scheme is as follows:
a mixing device of rare earth minerals and sulfuric acid comprises: frame, blendor main part, agitating unit and heating device, blendor main part both ends are fixed respectively in the frame of both sides, and the blendor main part includes: the tail gas exhaust device comprises a shell, a feed inlet, a discharge outlet and a tail gas outlet, wherein the shell is a cylindrical double-layer shell, and the feed inlet, the discharge outlet and the tail gas outlet are arranged on the shell; the feed inlet and the tail gas outlet are positioned at the upper part of the shell, the feed inlet is positioned at the head end of the shell, and the discharge outlet is positioned at the lower part and at the tail end of the shell; the stirring device comprises: the stirring shaft is positioned in the shell, two ends of the stirring shaft extend out of two ends of the shell respectively and are connected to the rack, and the paddle is connected to the outer wall of the stirring shaft; the motor is fixed on the frame, and a rotating shaft of the motor is connected with the end part of the stirring shaft; the heating device includes: the heating interlayer is positioned inside the double-layer shell; the temperature control component is used for controlling the heating temperature and the heating time of the heating interlayer.
Furthermore, the motor is positioned at one side of the tail end of the shell, and the rotating speed is between 1 and 200 r/min.
Further, a shaft sealing device is arranged between the two ends of the shell and the stirring shaft.
Further, the temperature control component is connected with the heating interlayer through a signal wire and a cable.
Compared with the prior art, the utility model have following advantage:
1. the rare earth minerals after the mixed sulfuric acid are solidified through the material mixing process, and the ring formation phenomenon is effectively prevented in the roasting process. Under the condition of not increasing the consumption of sulfuric acid, the decomposition efficiency of rare earth minerals is improved, and the problem of reactant ring formation is solved.
2. The low-temperature mixing time is prolonged, and the decomposition rate of the sulfuric acid on the rare earth minerals is effectively improved on the premise of not decomposing the sulfuric acid.
3. The mixing device has the functions of stirring, conveying and heating materials, slurry is obtained after mixed rare earth concentrate entering from the feed inlet and sulfuric acid are mixed, the slurry is fully mixed under the stirring of the paddle, the acid ore concentrate is heated and cured by the heating device and then is crushed and pushed to enter the reactor, the mixing process of the materials is more sufficient, and the cured materials have the advantages of being free of sticking to the kiln, reducing the labor intensity and the like for a subsequent reactor.
Drawings
Fig. 1 is a schematic structural diagram of a mixing device for rare earth minerals and sulfuric acid in the utility model.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
As shown in fig. 1, is a schematic structural diagram of a mixing device for rare earth minerals and sulfuric acid in the present invention.
Tombarthite mineral and sulphuric acid's compounding device, the structure includes: frame 1, blendor main part 2, agitating unit 3 and heating device 4.
2 both ends of blendor main part are fixed respectively on the frame 1 of both sides, and frame 1 includes as the supporting component, and blendor main part 2 includes: the device comprises a shell 21, a feed inlet 22, a discharge outlet 23 and a tail gas outlet 24, wherein the shell 21 is a cylindrical double-layer shell, and the feed inlet 22, the discharge outlet 23 and the tail gas outlet 24 are arranged on the shell 21; the feed inlet 7 and the tail gas outlet 8 are positioned at the upper part of the shell 21, the feed inlet 7 is close to the head end of the shell 21, and the discharge outlet 9 is positioned at the lower part and close to the tail end of the shell 21; the material gets into inside shell 21 through feed inlet 22, and the material in the shell 21 is discharged through discharge gate 23, and the gas that different materials produced in the compounding in-process reaction is discharged through tail gas outlet 24.
Agitating unit 3 installs inside the casing for stirring, cutting and propelling movement material. The stirring device comprises: two stirring shafts 31, a paddle 32 and a motor 33. Two (mixing) shafts 31 are located inside shell 21, and both ends are connected respectively in frame 1, are connected with paddle 32 on (mixing) shaft 31's the outer wall, and paddle 32 is used for cutting, broken rare earth mineral to accomplish the screw propulsion. The motor 33 is fixed on the frame 1 and located at one side of the tail end of the shell 21, the rotating shaft of the motor 33 is connected with the end part of the stirring shaft 31, the stirring shaft 31 is driven by the motor 33 to rotate, the rotating speed of the motor 33 can be regulated and controlled, and the rotating speed is between 1 and 200 r/min. Shaft sealing devices are arranged between the two ends of the shell 21 and the stirring shaft 31.
The heating device 4 is used for heating the material stirring process. The heating device 4 includes: temperature control part 41 and heating interlayer 42, heating interlayer 42 is located inside the double-layer shell and is used for heating and insulating materials in shell 21. The temperature control component 41 is used for controlling the heating temperature and the heating time of the heating interlayer 42, the temperature control component 41 is connected with the heating interlayer 42 through a signal wire and a cable, and the temperature control component 41 and the motor 33 are connected with a power supply through the cable.
The mixing method of the rare earth mineral and the sulfuric acid comprises the following specific steps:
step 1: rare earth minerals and concentrated sulfuric acid are added into a shell 21 of a mixing device from a feeding hole 22, the rare earth minerals and the concentrated sulfuric acid are stirred and mixed by a paddle 32, and the mixing temperature of the sulfuric acid and the rare earth minerals is controlled to be 100-200 ℃ in the mixing process;
step 2: the compounding is gone on in shell 21, and the material accomplishes chemical reaction in the propulsion of paddle 32 and the heating process of heating interlayer 42, and the state of compounding becomes for the paste and then solidifies by the thick liquid form gradually, and the material after the solidification passes through paddle 32 cutting, breakage, screw propulsion to discharge gate 23, and the material is discharged from discharge gate 23, accomplishes the compounding.
Heating interlayer 42 heats the compounding, and the diffusion of sulphuric acid can be accelerated to the compounding temperature between 100 ~ 200 ℃, reduces sulphuric acid and decomposes, improves rare earth mineral's decomposition efficiency for the reactant state changes, makes rare earth mineral at compounding in-process high efficiency reaction.
The material mixing time is 10-30 min, concentrated sulfuric acid and rare earth mineral are physically cut through the paddle, the rare earth mineral and the concentrated sulfuric acid react to generate substances such as calcium sulfate (gypsum) and iron phosphate in the material mixing process, the mixed material is stirred to be solid from a slurry state, the solid material generated after reaction and the rare earth mineral in the reaction process are crushed into solid small particles through the paddle, the utilization rate of sulfuric acid is improved, the decomposition efficiency of the rare earth mineral is improved, the problem of reactant ring formation is solved, and the ring formation phenomenon caused by direct contact of the slurry acid mineral and the inner wall of the roasting device is prevented.
Example one
Adding rare earth minerals and concentrated sulfuric acid into a mixing device, wherein the mixing temperature is 150 ℃, the mixing time is 20 minutes, the rotating speed of a paddle 32 is 50r/min, in the mixing process, along with continuous cutting of the paddle 32, concentrate after mixing sulfuric acid is gradually changed into paste from a slurry state, then, the concentrate is continuously crushed into solid small-particle minerals through the paddle 32, and the solid small-particle minerals are discharged from a discharge hole 23 under the action of spiral pushing, wherein the REO decomposition rate in the minerals is 66.7%.
Example two
Adding rare earth minerals and concentrated sulfuric acid into a mixing device, wherein the mixing temperature is 120 ℃, the mixing time is 25 minutes, the rotating speed of a paddle 32 is 20r/min, during the mixing process, along with the continuous cutting of a blade 32, concentrate mixed with sulfuric acid is gradually changed into paste from a slurry state, then, the concentrate is continuously crushed into solid small-particle minerals through the paddle 32, the solid small-particle minerals are discharged from a discharge hole 23 under the spiral pushing action, and the REO decomposition rate in the minerals is 75.8%.
EXAMPLE III
Adding rare earth minerals and concentrated sulfuric acid into a mixing device, wherein the mixing temperature is 100 ℃, the mixing time is 30 minutes, the rotating speed of a paddle 32 is 100r/min, in the mixing process, along with the continuous cutting of the paddle 32, concentrate mixed with sulfuric acid is gradually changed into paste from a slurry state, then, the concentrate is continuously crushed into solid small-particle minerals through the paddle 32, the solid small-particle minerals are discharged from a discharge hole 23 under the action of spiral pushing, and the REO decomposition rate in the minerals is 73.7%.
Example four
Adding rare earth minerals and concentrated sulfuric acid into a mixing device, wherein the mixing temperature is 200 ℃, the mixing time is 10 minutes, the rotating speed of a paddle 32 is 1r/min, during the mixing process, along with the continuous cutting of the paddle 32, concentrate mixed with sulfuric acid is gradually changed into paste from a slurry state, then, the concentrate is continuously crushed into solid small-particle minerals through the paddle 32, and the minerals are discharged from a discharge hole 23 under the action of spiral pushing, wherein the REO decomposition rate in the minerals is 65.4%.
EXAMPLE five
Adding rare earth minerals and concentrated sulfuric acid into a mixing device, wherein the mixing temperature is 170 ℃, the mixing time is 15 minutes, the rotating speed of a paddle 32 is 75r/min, the concentrate after mixing sulfuric acid is gradually changed into paste from a slurry state along with continuous cutting of the paddle 32 in the mixing process, then continuously crushing the concentrate into solid small-particle minerals through the paddle 32, and discharging the solid small-particle minerals from a discharge hole 23 under the action of spiral pushing, wherein the REO decomposition rate in the minerals is 67.2%.
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (4)
1. The utility model provides a compounding device of rare earth mineral and sulphuric acid which characterized in that includes: frame, blendor main part, agitating unit and heating device, blendor main part both ends are fixed respectively in the frame of both sides, and the blendor main part includes: the tail gas exhaust device comprises a shell, a feed inlet, a discharge outlet and a tail gas outlet, wherein the shell is a cylindrical double-layer shell, and the feed inlet, the discharge outlet and the tail gas outlet are arranged on the shell; the feed inlet and the tail gas outlet are positioned at the upper part of the shell, the feed inlet is positioned at the head end of the shell, and the discharge outlet is positioned at the lower part and at the tail end of the shell; the stirring device comprises: the stirring shaft is positioned in the shell, two ends of the stirring shaft respectively extend out of two ends of the shell and are connected to the frame, and the paddle is connected to the outer wall of the stirring shaft; the motor is fixed on the frame, and a rotating shaft of the motor is connected with the end part of the stirring shaft; the heating device includes: the heating interlayer is positioned inside the double-layer shell; the temperature control component is used for controlling the heating temperature and the heating time of the heating interlayer.
2. A mixing apparatus for rare earth minerals and sulfuric acid as claimed in claim 1, wherein the motor is provided at a trailing end side of the casing at a rotation speed of 1 to 200 r/min.
3. A mixing device of rare earth minerals and sulfuric acid as claimed in claim 1, wherein shaft sealing means are provided between both ends of the outer casing and the stirring shaft.
4. A mixing apparatus for rare earth minerals and sulfuric acid as claimed in claim 1, wherein the temperature control unit is connected to the heating chamber via a signal line and a cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020698468.3U CN212523721U (en) | 2020-04-30 | 2020-04-30 | Mixing device of rare earth mineral and sulfuric acid |
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| CN202020698468.3U CN212523721U (en) | 2020-04-30 | 2020-04-30 | Mixing device of rare earth mineral and sulfuric acid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023240343A1 (en) * | 2022-06-13 | 2023-12-21 | His Majesty The King In Right Of Canada As Represented By The Minister Of Natural Resources | A process and system for extracting rare earth elements using high pulp density cracking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023240343A1 (en) * | 2022-06-13 | 2023-12-21 | His Majesty The King In Right Of Canada As Represented By The Minister Of Natural Resources | A process and system for extracting rare earth elements using high pulp density cracking |
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