CN115927879A - Method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag - Google Patents
Method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag Download PDFInfo
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Abstract
The invention discloses a method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag, belonging to the technical field of lithium recovery. The invention is used for solving the technical problems that in the roasting and recovery process of lithium in the prior art, the flow effect between lithium-containing waste and a chemical additive is poor, the roasting time is long, and the auxiliary cooling of the roasted high-temperature material cannot be carried out, and the method for recovering the lithium from the lithium-containing rare earth slag comprises the following operation steps: pretreatment: adding CaO into the lithium-containing rare earth slag, wherein the weight ratio of CaO to the lithium-containing rare earth slag is 1:1, obtaining a mixture of the rare earth slag and CaO. The invention can not only crush and grind the lithium-containing waste and the chemical auxiliary agent, promote the mixing of the lithium-containing waste and the chemical auxiliary agent and shorten the roasting time, but also promote the flow of the cooling chamber and the outside air and shorten the cooling time of the high-temperature material, and is convenient to use.
Description
Technical Field
The invention relates to the technical field of lithium recovery, in particular to a method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag.
Background
Lithium salts are used in the production of lithium ion batteries, glass, ceramics, pharmaceuticals, lubricants, air treatment or aluminum smelting. It also has potential applications in electric vehicles, lithium aluminum alloys for aircraft, and smart grid storage systems. When the lithium salt is used, the lithium salt is usually mixed with other materials such as rare earth or boron aluminum and the like for use, so as to improve the physical and chemical properties of the materials.
In the prior art, a lime burning method is generally used for recovering lithium, lithium in waste materials is dissociated from the waste materials through a high-temperature burning reaction of a roasting device, and then the recovered lithium is further extracted and purified through a chemical method to reach the recovery standard.
A solution is now proposed to address the technical drawback in this respect.
Disclosure of Invention
The invention aims to provide a method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag, which is used for solving the technical problems that in the roasting recovery process of lithium in the prior art, the flow effect between lithium-containing waste and a chemical auxiliary agent is poor, the roasting time is long, and the roasted high-temperature material cannot be subjected to auxiliary cooling.
The purpose of the invention can be realized by the following technical scheme:
a method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag comprises the following operation steps:
s1, pretreatment: adding CaO into the lithium-containing rare earth slag, wherein the weight ratio of CaO to the lithium-containing rare earth slag is 1:1, obtaining a mixture of rare earth slag and CaO;
s2, roasting: putting the mixture of the rare earth slag and CaO into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, and cooling to room temperature to obtain a roasted mixture;
s3, leaching and resolving: adding deionized water into the roasted mixture obtained in the step S2, wherein the weight volume ratio of the roasted mixture to the deionized water is 1g:5mL, stirring at a constant temperature of 90 ℃ for 3-5h, carrying out vacuum filtration while the solution is hot, cooling the filtrate to room temperature, adding ethanol with the volume 2-3 times of that of the filtrate into the filtrate, stirring for 30min, carrying out vacuum filtration, leaching with a small amount of ethanol to obtain a filter cake, and drying;
s4, secondary roasting: adding aluminum skimmings and CaO into the dried filter cake in the step S3, wherein the weight ratio of the filter cake to the aluminum skimmings to the CaO is 1g:1.5g:3g, adding the mixture into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, cooling to room temperature, and repeating the step S3 to obtain a recovered product;
the method for recovering lithium from the boron-aluminum slag comprises the following operation steps:
a1, pretreatmentTreating: crushing boron-aluminum slag, sieving with a 10-20 mesh sieve, and adding 95-98% H into the crushed boron-aluminum slag 2 SO 4 Boron aluminum slag and H 2 SO 4 The weight volume ratio of (1 g): 8mL to obtain a boron-aluminum slag sulfuric acid mixture;
a2, roasting: adding the boron-aluminum slag sulfuric acid mixture obtained in the step A1 into a roasting furnace, heating to 290-310 ℃, roasting for 40-60min, and cooling to room temperature to obtain a boron-aluminum slag roasting mixture;
a3, leaching and resolving: slowly adding the boron-aluminum slag roasting mixture obtained in the step A1 and H 2 SO 4 Stirring the deionized water with equal volume for 40-60min at room temperature, performing vacuum filtration, adding methanol with volume 2-3 times of the filtrate into the filtrate, stirring for 30min, performing vacuum filtration, leaching with a small amount of methanol to obtain a filter cake, and drying;
a4, secondary roasting: adding aluminum skimmings and CaO into the filter cake dried in the step A3, wherein the weight ratio of the filter cake to the aluminum skimmings to the CaO is 1g:1.5g:3g, adding the mixture into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, cooling to room temperature, and repeating the step S3 to obtain a recovered product.
Furthermore, the roasting device comprises a shell, a roasting cavity and a cooling cavity are arranged on the inner side of the shell, the roasting cavity is positioned above the cooling cavity, a feeding groove communicated with the roasting cavity is formed in the top of one side of the shell, a discharging groove communicated with the cooling cavity is formed in the bottom of the roasting cavity, a material baffle is arranged on the discharging groove, two crushing rollers arranged along the length direction of the roasting cavity and a driving assembly used for driving the two crushing rollers to rotate are rotatably arranged on the inner side of the roasting cavity, and a plurality of material conveying plates arranged in an annular array are arranged on the inner side of the roasting cavity;
the inner walls of two sides of the roasting chamber are rotatably provided with mounting rings, the outer walls of the two mounting rings are fixedly connected with connecting rods arranged corresponding to the material conveying plates, and the other ends of the connecting rods are fixedly connected with the outer wall of one side, close to the material conveying plates, of the material conveying plates respectively;
the material receiving box is connected to the bottom of the inner side of the cooling cavity in a sliding mode, and one end of the material receiving box extends to the outside of the shell.
Furthermore, the feed chute sets up downwards towards the slope of calcination cavity, and the outside top rigid coupling of casing has feed hopper, and feed hopper's bottom inner wall flushes with the inboard bottom of feed chute, and feed hopper's top is equipped with sealed apron, and one side that sealed apron is close to the casing is articulated with the casing.
Further, the drive assembly includes the install bin of rigid coupling on roasting cavity one side inner wall, rotates and installs first gear and two second gears at the install bin inboard, one side externally mounted of casing has and is used for driving first gear revolve's driving motor, two second gears are located the both sides of first gear respectively and all with first gear intermeshing, the transmission shaft has all been cup jointed in the axle center department of two second gears, the one end of two transmission shafts all extends to the outside of install bin and respectively with the one end outer wall fixed connection of two crushing rolls.
Furthermore, the plurality of material conveying plates are of arc-shaped structures, the outer wall of one side, away from each other, of each material conveying plate is abutted to the inner wall of the roasting chamber, a plurality of tooth grooves are formed in the inner side wall of one mounting ring, a third gear is sleeved outside one of the transmission shafts, and one end of the third gear extends to the outside of the mounting box and is meshed with the tooth grooves in the mounting ring.
Further, the cavity has all been seted up to cooling cavity both sides inner wall, a plurality of wind-guiding holes that are linked together with the cavity have all been seted up to the both sides outer wall of casing, the equal rigid coupling of one end that two cavities are close to each other has a round platform section of thick bamboo, install a plurality of filter screens on the outer wall of round platform section of thick bamboo, rotate between two round platform sections and install the cross axle, a plurality of material turning plates one side outer wall that are close to each other all with the outer wall rigid coupling of cross axle, the both ends of cross axle extend to the inboard of two cavities respectively and are connected with one of them collar drive through the link gear, the cross axle is located the inboard one end externally mounted of cavity and has the flabellum.
Further, the link gear is including seting up the annular cavity at calcination cavity one side inner wall, and first helical gear is installed in the inboard commentaries on classics of annular cavity, the one end that the crushing roller was kept away from to the collar extends to the inboard of annular cavity, and the collar is located the one end outer lane of the indoor side of annular cavity and offers the skewed tooth groove with first helical gear engaged with, the inboard rigid coupling of a cavity that is located under first helical gear has the mounting bracket, and the inboard rotation of mounting bracket installs two intermeshing's second helical gear, and the bottom center rigid coupling of first helical gear has the vertical axis, and the bottom of vertical axis extends to the inboard of mounting bracket and one of them second helical gear rigid coupling, the one end and another second helical gear rigid coupling of cross axle.
Further, the inboard of arranging the silo sets up the spout that sets up along its length direction, the both sides outer wall of striker plate extends to the inboard of two spouts respectively and with spout sliding connection, and the one end of striker plate extends to the outside of casing.
The invention has the following beneficial effects:
1. the purity of the lithium salt obtained by recovery can be effectively improved through secondary roasting, the oxidation cover and the lithium-containing waste are mixed and roasted, the lithium recovery cost is effectively reduced, when the lithium-containing waste and the chemical auxiliary are roasted, the materials can be continuously and upwards conveyed between two crushing rollers by a plurality of turnover conveying plates, the lithium-containing waste and the chemical auxiliary are crushed, and the flow between the lithium-containing waste and the chemical auxiliary is promoted, so that the roasting time is shortened, and the reaction rate of lithium in the waste and the chemical auxiliary is improved.
2. Can separate calcination cavity and cooling cavity through the striker plate, after the calcination is accomplished, can be with the leading-in cooling cavity of the high temperature material that the calcination was accomplished, through the link gear transmission, can carry out the broken while at the waste material, turn and promote the air flow of cooling cavity and external, guarantee the heat transfer effect of high temperature material in the heat transfer cavity, reduce the cooling time of high temperature material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front cross-sectional structural view of the overall structure of the present invention;
FIG. 3 is a left side sectional structural view of the overall structure of the present invention;
FIG. 4 is an enlarged schematic view of the structure at A in FIG. 2 according to the present invention;
FIG. 5 is a schematic view of the fitting structure of the mounting case and the mounting ring according to the present invention;
FIG. 6 is a schematic view of the overall structure of the circular truncated cone of the present invention;
fig. 7 is a schematic structural view of the material turning plate and the transverse shaft in the invention.
In the figure: 1. a housing; 101. a roasting chamber; 102. a cooling chamber; 103. a feed chute; 104. a feed hopper; 105. sealing the cover plate; 106. a discharge chute; 2. a crushing roller; 3. a drive assembly; 301. installing a box; 302. a first gear; 303. a second gear; 304. a drive motor; 4. a material conveying plate; 401. a mounting ring; 402. a connecting rod; 403. a third gear; 5. a striker plate; 501. a chute; 6. a material receiving box; 7. a material turning plate; 701. a circular truncated cone; 702. a filter screen; 703. a horizontal axis; 8. a linkage mechanism; 801. a cavity; 802. a first helical gear; 803. a vertical axis; 804. a mounting frame; 805. a second helical gear; 806. and fan blades.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag in the embodiment comprises the following operation steps:
s1, pretreatment: adding CaO into the lithium-containing rare earth slag, wherein the weight ratio of CaO to the lithium-containing rare earth slag is 1:1, obtaining a mixture of rare earth slag and CaO, wherein the rare earth slag contains aluminum;
s2, roasting: putting the mixture of the rare earth slag and CaO into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, and cooling to room temperature to obtain a roasted mixture;
s3, leaching and resolving: and (3) adding deionized water into the roasted mixture obtained in the step (S2), wherein the weight volume ratio of the roasted mixture to the deionized water is 1g:5mL, stirring at a constant temperature of 90 ℃ for 3-5h, carrying out vacuum filtration while the solution is hot, cooling the filtrate to room temperature, adding ethanol with the volume 2-3 times of that of the filtrate into the filtrate, stirring for 30min, carrying out vacuum filtration, leaching with a small amount of ethanol to obtain a filter cake, drying, wherein the lithium salt is easily soluble in water but insoluble in an organic solvent, and adding ethanol into the lithium salt aqueous solution to separate the lithium salt from the water;
s4, secondary roasting: adding aluminum skimmings and CaO into the filter cake dried in the step S3, wherein the weight ratio of the filter cake to the aluminum skimmings to the CaO is 1g:1.5g:3g, adding the lithium salt into a roasting device, heating to 1100-1150 ℃ for roasting for 35-45min, cooling to room temperature, repeating the step S3 to obtain a recovered product, and performing secondary roasting and leaching analysis on the recovered lithium salt to improve the purity of the recovered lithium salt;
the method for recovering lithium from the boron-aluminum slag comprises the following operation steps:
a1, pretreatment: crushing boron-aluminum slag, sieving with a 10-20 mesh sieve, and adding 95-98% H into the crushed boron-aluminum slag 2 SO 4 Boron aluminum slag and H 2 SO 4 The weight volume ratio of (1 g): 8mL to obtain a boron-aluminum slag-sulfuric acid mixture, and crushing the boron-aluminum slag to ensure that the boron-aluminum slag is relatively uniform and avoid large particles from being wrapped;
a2, roasting: adding the boron-aluminum slag sulfuric acid mixture obtained in the step A1 into a roasting furnace, heating to 290-310 ℃, roasting for 40-60min, and cooling to room temperature to obtain a boron-aluminum slag roasting mixture;
a3, leaching and resolving: slowly adding the boron-aluminum slag roasting mixture obtained in the step A1 and H 2 SO 4 Stirring deionized water with equal volume for 40-60min at room temperature, performing vacuum filtration, adding methanol with volume 2-3 times of the filtrate into the filtrate, stirring for 30min, performing vacuum filtration, leaching with a small amount of methanol to obtain a filter cake, drying to obtain a lithium salt solution, wherein the lithium salt solution is easily soluble in water but insoluble in organic solvent, and adding methanol into the lithium salt solution to separate the lithium salt from the water;
a4, secondary roasting: adding aluminum skimmings and CaO into the filter cake dried in the step A3, wherein the weight ratio of the filter cake to the aluminum skimmings to the CaO is 1g:1.5g: and 3g, adding the mixture into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, cooling to room temperature, repeating the step S3, and obtaining a recovered product, wherein the recovery purity of the lithium salt can be improved through secondary roasting.
Example 2
The embodiment is used for solving the problem of uneven mixing between the lithium raw material to be recovered and purified and the chemical auxiliary agent when the lithium is roasted and recovered.
Referring to fig. 1, fig. 2, fig. 3 and fig. 5, a method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to this embodiment includes a housing 1, a roasting chamber 101 and a cooling chamber 102 are disposed on an inner side of the housing 1, the roasting chamber 101 is located above the cooling chamber 102, a feeding chute 103 communicated with the roasting chamber 101 is disposed at a top of one side of the housing 1, a discharging chute 106 communicated with the cooling chamber 102 is disposed at a bottom of the roasting chamber 101, a material baffle plate 5 is mounted on the discharging chute 106, two crushing rollers 2 disposed along a length direction of the roasting chamber 101 and a driving assembly 3 for driving the two crushing rollers 2 to rotate are rotatably mounted on an inner side of the roasting chamber 101, a plurality of material conveying plates 4 disposed in an annular array are mounted on an inner side of the roasting chamber 101, mounting rings 401 are rotatably mounted on inner walls on two sides of the roasting chamber 101, connecting rods 402 disposed corresponding to the plurality of material conveying plates 4 are fixedly connected to outer walls of the two mounting rings 401, and the other ends of the connecting rods 402 are fixedly connected to outer walls of one side of the plurality of the material conveying plates 4, which are adjacent to each other side
Insert the inboard of casing 1 with striker plate 5, block row chute 106, thereby block calcination cavity 101 and cooling cavity 102, be equipped with the heating pipe (not shown) on casing 1, the externally mounted of casing 1 has the PLC controller, under the power connection state, the heating pipe intensifies and heaies up calcination cavity 101, defeated flitch 4 rotates, mention continuous upwards of calcination thing in the inboard bottom of calcination cavity 101, fall into between two crushing rollers 2, two crushing rollers 2 of drive assembly 3 drive rotate, thereby roast thing in the calcination cavity 101 is broken, make the granule of calcination thing diminish and misce bene.
In order to conveniently add the material into roasting chamber 101, feed chute 103 sets up downwards towards roasting chamber 101 slope, and the outside top rigid coupling of casing 1 has feed hopper 104, and the bottom inner wall of feed hopper 104 flushes with the inboard bottom of feed chute 103, and feed hopper 104's top is equipped with sealed apron 105, and sealed apron 105 is close to one side of casing 1 and articulates with casing 1.
Install the hasp (not shown) of mutually supporting with sealed apron 105 in the one side bottom that feed hopper 104 kept away from casing 1, cover sealed apron 105 and lock the hasp, seal feed hopper 104, carry out further enlargeing through feed hopper 104 to feed chute 103, conveniently add the material in calcination cavity 101.
In order to separate the roasting chamber 101 from the cooling chamber 102, the inner side of the discharge groove 106 is provided with a sliding groove 501 arranged along the length direction thereof, the outer walls of two sides of the striker plate 5 respectively extend to the inner sides of the two sliding grooves 501 and are in sliding connection with the sliding grooves 501, one end of the striker plate 5 extends to the outside of the housing 1, the bottom of the inner side of the cooling chamber 102 is in sliding connection with the material receiving box 6, and one end of the material receiving box 6 extends to the outside of the housing 1.
As a further explanation of the driving assembly 3, the driving assembly 3 includes an installation box 301 fixedly connected to the inner wall of one side of the baking chamber 101, a first gear 302 and two second gears 303 rotatably installed inside the installation box 301, a driving motor 304 for driving the first gear 302 to rotate is installed outside one side of the housing 1, the two second gears 303 are respectively located on two sides of the first gear 302 and are mutually engaged with the first gear 302, transmission shafts are respectively sleeved at the axes of the two second gears 303, and one ends of the two transmission shafts respectively extend to the outside of the installation box 301 and are respectively fixedly connected with the outer walls of one ends of the two crushing rollers 2.
The driving motor 304 drives the first gear 302 to rotate, drives the second gears 303 on two sides of the first gear to rotate simultaneously, and the rotation directions of the two second gears 303 are opposite, so that one of the crushing rollers 2 rotates clockwise, and the other crushing roller 2 rotates counterclockwise, thereby crushing the roasted material between the two crushing rollers 2.
For can promote the calcination thing in the calcination cavity 101 to the top of two crushing rollers 2, a plurality of defeated flitchs 4 are circular-arc structure, the mutual one side outer wall of keeping away from of a plurality of defeated flitchs all with the inner wall butt of calcination cavity 101, a plurality of tooth spaces have been seted up to the inside wall of one of them installing ring 401, the outside cover of one of them transmission shaft is equipped with third gear 403, the one end of third gear 403 extends to the outside of install bin 301 and meshes mutually with the tooth space on the installing ring 401.
The defeated flitch 4 of circular-arc structure can hold more calcination thing, and when a plurality of defeated flitchs 4 pivoted simultaneously, can scrape the inner wall of calcination cavity 101 to avoid calcination thing and the inner wall bonding of calcination cavity 101, in second gear 303 pivoted, drive third gear 403 and rotate, thereby drive collar 401, and then the synchronous rotation of a plurality of defeated flitchs of drive 4.
Example 3
This embodiment is arranged in solving among the prior art roasting device and lacks the setting of carrying out supplementary cooling to the high temperature material that the calcination produced, the longer problem of time that high temperature material cooling needs.
Referring to fig. 2-7, in the method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to the embodiment, a plurality of material turning plates 7 are installed inside the cooling chamber 102, and the material turning plates 7 are matched with the material conveying plates 4 through a linkage mechanism 8.
The striker plate 5 is pulled towards the outside of the shell 1, the discharge groove 106 is opened, the materials in the roasting chamber 101 fall into the cooling chamber 102, and the plurality of material turning plates 7 continuously raise the high-temperature materials in the cooling chamber 102, so that the high-temperature materials are promoted to be rapidly cooled.
For improving the cooling effect of the cooling chamber 102 on high-temperature materials, cavities 801 are formed in inner walls of two sides of the cooling chamber 102, a plurality of air guide holes communicated with the cavities 801 are formed in outer walls of two sides of the shell 1, a circular truncated cone 701 is fixedly connected to one end, close to each other, of the two cavities 801, a plurality of filter screens 702 are installed on the outer wall of the circular truncated cone 701, a cross shaft 703 is rotatably installed between the two circular truncated cone 701, outer walls of one sides, close to each other, of a plurality of material turning plates 7 are fixedly connected with the outer wall of the cross shaft 703, two ends of the cross shaft 703 extend to the inner sides of the two cavities 801 respectively and are in transmission connection with one of the mounting rings 401 through a linkage mechanism 8, and fan blades 806 are installed outside one end, located inside the cavity 801, of the cross shaft 703.
Two flabellum 806 are along with cross axle 703 synchronous rotation, one of them flabellum 806 rotates and blows after filtering with external air through filter screen 702 and send to cooling chamber 102 in, another flabellum 806 rotates and blows off from cooling chamber 102 after filtering through filter screen 702 in with cooling chamber 102, thereby promote the air flow in cooling chamber 102, in the time of cross axle 703 pivoted, a plurality of material turning plates 7 synchronous rotation, both ends at material turning plates 7 all are equipped with the opening that corresponds the setting with a round platform section of thick bamboo 701, thereby can be in material turning plates 7 pivoted, scrape filter screen 702, avoid the dust to block up filter screen 702, guarantee cooling chamber 102 and external circulation of air, thereby shorten the cooling time of high temperature material.
In order to drive the transverse shaft 703 to synchronously rotate when the mounting ring 401 rotates, the linkage mechanism 8 comprises an annular chamber which is arranged on the inner wall of one side of the roasting chamber 101, a first bevel gear 802 is rotatably arranged on the inner side of the annular chamber, one end of the mounting ring 401, which is far away from the crushing roller 2, extends to the inner side of the annular chamber, an outer ring of one end of the mounting ring 401, which is positioned on the inner side of the annular chamber, is provided with a bevel gear groove meshed with the first bevel gear 802, a mounting frame 804 is fixedly connected to the inner side of a cavity 801 positioned right below the first bevel gear 802, two second bevel gears 805 which are meshed with each other are rotatably arranged on the inner side of the mounting frame 804, a vertical shaft 803 is fixedly connected to the center of the bottom of the first bevel gear 802, the bottom of the vertical shaft 803 extends to the inner side of the mounting frame 804 and is fixedly connected with one of the second bevel gears 805, and one end of the transverse shaft 703 is fixedly connected with the other second bevel gear 805.
The collar 401 rotates, drives the first helical gear 802 rotation of meshing with it to the rotation of drive vertical axis 803, through the transmission of two intermeshing's second helical gear 805, thereby drive horizontal axle 703 rotates, and through the setting of link gear 8, can effectually cooperate the calcination of the waste material that equipment was treated to retrieve with the cooling process, and the accessory cooperation between the equipment is inseparabler.
As shown in fig. 1-7, the working process and principle of the present invention are as follows:
when the material receiving box is used, the material blocking plate 5 is inserted into the inner side of the shell 1, the sealing cover plate 105 is opened, lithium-containing waste to be roasted is mixed with a chemical additive and then is added into the roasting cavity 101 of the shell 1, the roasting cavity 101 is heated to a set temperature to roast materials, the driving motor 304 drives the two crushing rollers 2 to rotate simultaneously, the plurality of material conveying plates 4 rotate synchronously along with the rotation of the two crushing rollers 2, the materials located at the inner bottom of the roasting cavity 101 are lifted upwards and fall between the two rotating crushing rollers 2, the materials are crushed by the rotating crushing rollers 2 and then fall to the inner bottom of the roasting cavity 101, continuous crushing and material mixing circulation is formed, the materials are uniformly mixed and are fully heated, after the roasting is completed, the material blocking plate 5 is pulled towards the outer part of the shell 1, the materials in the roasting cavity 101 fall into the cooling cavity 102, then the material blocking plate 5 is inserted into the inner side of the shell 1, the roasting materials are added into the roasting cavity 101 for roasting processing, the roasted materials are driven by the linkage mechanism 8, the material blocking plate 7 in the driving the material stirring chamber 102 to rotate, thereby the high-temperature stirring chamber 102 is pulled and the material is pulled to accelerate the cooling material collecting and the material collecting material and the material collecting box 806, and the material collecting box is convenient for the external material.
The foregoing is merely illustrative and explanatory of the present invention, and various modifications, additions or substitutions as would be apparent to one skilled in the art to the specific embodiments described are possible without departing from the invention as claimed herein or beyond the scope thereof.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag is characterized in that the method for recovering lithium from lithium-containing rare earth slag comprises the following operation steps:
s1, pretreatment: adding CaO into the lithium-containing rare earth slag, wherein the weight ratio of the CaO to the lithium-containing rare earth slag is 1:1, obtaining a mixture of rare earth slag and CaO;
s2, roasting: putting the mixture of the rare earth slag and CaO into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, and cooling to room temperature to obtain a roasted mixture;
s3, leaching and resolving: adding deionized water into the roasted mixture obtained in the step S2, wherein the weight volume ratio of the roasted mixture to the deionized water is 1g:5mL, stirring at a constant temperature of 90 ℃ for 3-5h, carrying out vacuum filtration while the solution is hot, cooling the filtrate to room temperature, adding ethanol with the volume 2-3 times of that of the filtrate into the filtrate, stirring for 30min, carrying out vacuum filtration, leaching with a small amount of ethanol to obtain a filter cake, and drying;
s4, secondary roasting: adding aluminum skimmings and CaO into the filter cake dried in the step S3, wherein the weight ratio of the filter cake to the aluminum skimmings to the CaO is 1g:1.5g:3g, adding the mixture into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, cooling to room temperature, and repeating the step S3 to obtain a recovered product;
the method for recovering lithium from boron-aluminum slag comprises the following operation steps:
a1, pretreatment: crushing boron-aluminum slag, sieving with a 10-20 mesh sieve, and adding 95-98% H into the crushed boron-aluminum slag 2 SO 4 Boron aluminum slag and H 2 SO 4 The weight volume ratio of (1 g): 8mL to obtain a boron-aluminum slag sulfuric acid mixture;
a2, roasting: adding the boron-aluminum slag sulfuric acid mixture obtained in the step A1 into a roasting furnace, heating to 290-310 ℃, roasting for 40-60min, and cooling to room temperature to obtain a boron-aluminum slag roasting mixture;
a3, leaching and resolving: slowly adding the boron-aluminum slag roasting mixture obtained in the step A1 and H 2 SO 4 Stirring deionized water with equal volume amount at room temperature for 40-60min, vacuum filtering, adding methanol with volume amount of 2-3 times of the filtrate into the filtrate, stirring for 30min, vacuum filtering, leaching with a small amount of methanol to obtain filter cake, and oven drying;
a4, secondary roasting: adding aluminum skimmings and CaO into the filter cake dried in the step A3, wherein the weight ratio of the filter cake to the aluminum skimmings to the CaO is 1g:1.5g:3g, adding the mixture into a roasting device, heating to 1100-1150 ℃, roasting for 35-45min, cooling to room temperature, and repeating the step S3 to obtain a recovered product.
2. The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to claim 1, wherein the roasting device comprises a shell (1), a roasting chamber (101) and a cooling chamber (102) are arranged on the inner side of the shell (1), the roasting chamber (101) is located above the cooling chamber (102), a feeding chute (103) communicated with the roasting chamber (101) is formed in the top of one side of the shell (1), a discharging chute (106) communicated with the cooling chamber (102) is formed in the bottom of the roasting chamber (101), a baffle plate (5) is mounted on the discharging chute (106), two crushing rollers (2) arranged along the length direction of the roasting chamber (101) and a driving assembly (3) used for driving the two crushing rollers (2) to rotate are rotatably mounted on the inner side of the roasting chamber (101), and a plurality of material conveying plates (4) arranged in an annular array are mounted on the inner side of the roasting chamber (101);
the inner walls of two sides of the roasting chamber (101) are rotatably provided with mounting rings (401), the outer walls of the two mounting rings (401) are fixedly connected with connecting rods (402) which are arranged corresponding to the plurality of material conveying plates (4), and the other ends of the connecting rods (402) are fixedly connected with the outer wall of one side, close to the plurality of material conveying plates (4), respectively;
a plurality of material turning plates (7) are installed on the inner side of the cooling cavity (102), the material turning plates (7) are matched with the material conveying plates (4) through a linkage mechanism, a material receiving box (6) is connected to the bottom of the inner side of the cooling cavity (102) in a sliding mode, and one end of the material receiving box (6) extends to the outside of the shell (1).
3. The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to claim 2, wherein the feeding chute (103) is arranged obliquely downwards towards the roasting chamber (101), a feeding funnel (104) is fixedly connected to the top of the outer side of the shell (1), the inner wall of the bottom of the feeding funnel (104) is flush with the bottom of the inner side of the feeding chute (103), the top of the feeding funnel (104) is provided with a sealing cover plate (105), and one side of the sealing cover plate (105), which is close to the shell (1), is hinged with the shell (1).
4. The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to claim 2, wherein the driving assembly (3) comprises a mounting box (301) fixedly connected to the inner wall of one side of the roasting chamber (101), a first gear (302) rotatably mounted inside the mounting box (301), and two second gears (303), a driving motor (304) for driving the first gear (302) to rotate is mounted outside one side of the housing (1), the two second gears (303) are respectively located on two sides of the first gear (302) and are mutually meshed with the first gear (302), transmission shafts are respectively sleeved at the shaft centers of the two second gears (303), and one ends of the two transmission shafts respectively extend to the outside of the mounting box (301) and are respectively fixedly connected with the outer walls of one ends of the two crushing rollers (2).
5. The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to claim 4, wherein the plurality of material conveying plates (4) are all of an arc-shaped structure, the outer walls of the sides, away from each other, of the plurality of material conveying plates (4) are abutted to the inner wall of the roasting chamber (101), the inner side wall of one mounting ring (401) is provided with a plurality of tooth grooves, the outer portion of one transmission shaft is sleeved with a third gear (403), and one end of the third gear (403) extends to the outer portion of the mounting box (301) and is meshed with the tooth grooves in the mounting ring (401).
6. The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to claim 2, wherein cavities (801) are formed in inner walls of two sides of the cooling chamber (102), a plurality of air guide holes communicated with the cavities (801) are formed in outer walls of two sides of the shell (1), a circular truncated cone (701) is fixedly connected to one end, close to each other, of each cavity (801), a plurality of filter screens (702) are mounted on an outer wall of the circular truncated cone (701), a transverse shaft (703) is rotatably mounted between the two circular truncated cone (701), outer walls of one sides, close to each other, of a plurality of material turning plates (7) are fixedly connected to an outer wall of the transverse shaft (703), two ends of the transverse shaft (703) extend to inner sides of the two cavities (801) respectively and are in transmission connection with one of the mounting rings (401) through a linkage mechanism (8), and fan blades (806) are mounted on the outer portion of one end, located on the inner side of the cavity (801), of the transverse shaft (703).
7. The method of claim 6, wherein the linkage mechanism (8) comprises an annular chamber formed in an inner wall of one side of the roasting chamber (101), a first bevel gear (802) is rotatably mounted on an inner side of the annular chamber, one end of the mounting ring (401) far away from the crushing roller (2) extends to the inner side of the annular chamber, an outer ring of one end of the mounting ring (401) on the inner side of the annular chamber is provided with a bevel gear groove engaged with the first bevel gear (802), a mounting frame (804) is fixedly connected to an inner side of one cavity (801) located right below the first bevel gear (802), two second bevel gears (805) engaged with each other are rotatably mounted on an inner side of the mounting frame (804), a vertical shaft (803) is fixedly connected to a center of a bottom of the first bevel gear (802), a bottom of the vertical shaft (803) extends to an inner side of the mounting frame (804) and is fixedly connected to one of the second bevel gears (805), and one end of the horizontal shaft (703) is fixedly connected to the other second bevel gear (805).
8. The method for recovering lithium from lithium-containing rare earth slag or boron-aluminum slag according to claim 3, wherein the inner side of the discharge chute (106) is provided with a sliding chute (501) arranged along the length direction of the discharge chute, the outer walls of two sides of the striker plate (5) respectively extend to the inner sides of the two sliding chutes (501) and are in sliding connection with the sliding chutes (501), and one end of the striker plate (5) extends to the outside of the shell (1).
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| CN116159656A (en) * | 2023-04-24 | 2023-05-26 | 恒达亲水胶体泰州有限公司 | Polymer material crushing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116159656A (en) * | 2023-04-24 | 2023-05-26 | 恒达亲水胶体泰州有限公司 | Polymer material crushing device and method |
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