Method for washing slag from roasting, leaching and filtering of lepidolite

Abstract

The present invention is to provide a lithium mica roasting leaching filtering slag washing system, which uses lithium mica or lithium ore as raw materials and fully mixes with sulfate, roasts into clinker, and then leaches and filters to obtain filtered lithium slag for washing or rinsing, and adopts a countercurrent washing process method and device for processing, wherein the countercurrent washing process method is to wash the filtered lithium slag using a filter slag countercurrent washing device. The extraction rate of lithium in the waste slag washed by the countercurrent washing process method is increased by more than 30-40% compared with the existing one, which is suitable for industrial large-scale production.

Description

Technical Field

[0001] The invention relates to the technical field of extracting lithium salt from lithium ore or lepidolite of lithium electric new energy materials, and in particular to a method for washing lepidolite roasting, leaching and filtering residue. Background Art

[0002] Lepidolite and lithium ore are one of the most important raw materials for extracting lithium salts. In the process of preparing lithium salts such as lithium carbonate using lepidolite as raw material, the lepidolite ore is usually processed into lepidolite concentrate powder or subjected to simple impurity removal treatment. The chemical production workshop for preparing lithium salts, i.e., where large-scale production workshop equipment is installed, carries out processes such as calcination, leaching, flushing or washing, which are important process steps for lithium extraction.

[0003] Since the lithium content in lepidolite is generally not high, usually within 2-6%, and the total content of other rare metals such as rubidium, cesium, potassium, etc. is not high; therefore, in the process steps of extracting lithium salts using lithium ore or lepidolite as raw materials, the control of each process method and device step will seriously affect the yield of lithium extracted using lepidolite as raw material. For example, in the process of extracting lithium using lepidolite as raw material, after lepidolite and sulfate are roasted, that is, the raw material after crushing lepidolite or lithium ore and sulfate are fully mixed, roasted into clinker, leached, filtered, and filtered lithium slag is obtained, that is, after leaching and filtering, the filtered slag is further rinsed or washed; if the washing treatment is not good, that is, the rare metal elements such as lithium in the filter slag are not rinsed cleanly, the residual very small amount of lithium, rubidium, cesium and other elements will be discarded with the washing slag, which will also cause the lithium, rubidium, cesium and other important rare metal elements calcined from the lepidolite to be wasted along with the loss of the washed lithium slag, resulting in unnecessary resource loss, and further increasing the production cost of extracting lithium salts from lepidolite. In the existing process of calcining lithium ore or lithium mica as raw materials, generally mixing with sulfate such as calcium sulfate, sodium sulfate, etc., and washing the filter residue after leaching, the existing washing or flushing process or device is used. When washing the filter residue after leaching, the slag is not clean enough, that is, the elements such as lithium, rubidium, and cesium in the filtered filter residue are not washed thoroughly enough, and the lithium content in the washed filter residue is still high. The purpose of recycling all the receivables cannot be achieved.

[0004] For example, the Chinese patent authorization announcement number: CN214865638U discloses a novel coprecipitation slurry washing device, which relates to a novel coprecipitation slurry washing device, including a reactor and a washing tank, wherein the reactor and the washing tank are connected by a transfer pipeline, one end of the transfer pipeline is connected to the lower end of the reactor, and the other end of the transfer pipeline is connected to the side wall of the upper part of the washing tank, wherein an agitator is arranged in the washing tank, the washing tank is a sealed structure, and a water supply pipeline and a pressurizing pipeline are arranged on both sides of the upper end, the water supply pipeline is connected to an external deionized water source, the pressurizing pipeline is connected to an air compressor, and a filter plate is arranged at the lower part of the washing tank. The utility model reduces the need for manual unloading process in the traditional plate and frame washing process during the washing process, greatly saving labor costs. At the same time, since the washing process is a dynamic uniform system, the material is washed evenly, and there is no dead corner problem in washing, which can significantly improve the washing effect of the catalyst slurry and improve the performance of the catalyst.

[0005] For example, the "A Hydrolysis Slurry Washing Device" disclosed in the Chinese Patent Authorization Announcement No.: CN211217773U specifically discloses a hydrolysis slurry washing device. It includes a frame, the lower end of the frame is movably connected to a washing bucket, four arc-shaped fixed plates are evenly distributed vertically between the upper and lower ends of the washing bucket, three annular fixed plates are evenly distributed on the four arc-shaped fixed plates, and a washing net is movably connected to the inner side of the arc-shaped fixed plates and the annular fixed plates; one side of the lower end of the washing bucket is movably connected to a material discharge bottom plate via a rotating shaft, and the other side of the material discharge bottom plate is movably connected to the lower end of the washing bucket via a latch; a stirring rod is movably provided on the axis of the washing bucket, and a stirring blade is provided on the stirring rod located in the washing bucket. The utility model has the beneficial effects of good washing effect, fast washing speed, long service life of the washing net, convenient replacement of the washing net, easy material discharge, and simple structure.

[0006] Another example is the Chinese patent application publication number: CN115215388A, published "A method for preparing a ternary positive electrode material and a ternary positive electrode material". This application discloses a method for preparing a ternary positive electrode material and a ternary positive electrode material, which are used to improve the preparation efficiency and yield of the ternary positive electrode material. The method includes: mixing a manganese salt and / or an aluminum salt with a nickel salt and a cobalt salt, and coprecipitating with an alkaline substance and a complexing agent in a solvent to obtain a coprecipitation slurry with a target median particle size; washing the coprecipitation slurry to obtain a ternary precursor slurry; in an inert atmosphere, mixing a lithium source with the ternary precursor slurry to obtain a first mixture; drying the first mixture to obtain a second mixture; and subjecting the second mixture to a high-temperature sintering treatment to obtain the ternary positive electrode material.

[0007] It can be seen from the above-disclosed washing devices for slurry that they are not professional for washing and flushing filtered lithium slag. If the above-mentioned existing type of washing and washing device is used to wash the filtered lithium slag after roasting, leaching and filtering of lithium mica and sulfate, the lithium element in the filtered lithium slag cannot be washed well, resulting in a waste of rare metal elements such as lithium. The cost of extracting lithium salts using lithium mica ore as raw material is also correspondingly increased. Moreover, the preparation process of this aspect of the existing washing process technology is more complicated, and the corresponding preparation cost is also higher.

[0008] Therefore, in view of this technical deficiency in the prior art, how to provide a method for washing lithium mica roasting leaching filtering residue. After lithium mica or lithium ore is used as raw material and fully mixed with sulfate, it is roasted into clinker, and then leached and filtered to obtain filtered lithium residue for washing or flushing treatment, and a countercurrent washing process method and device are used for treatment. The countercurrent washing process method is to wash the filtered lithium residue using a filter residue countercurrent washing device. The extraction rate of lithium in the waste residue washed by the countercurrent washing process is increased by more than 30-40% compared with the existing one, and at the same time, the clean washing output of the filtered lithium residue can be guaranteed, which is suitable for the advantages of industrial production. Summary of the invention

[0009] The present invention is to provide a method for washing lithium mica roasting leaching filtering residue, wherein lithium mica or lithium ore is used as raw material and fully mixed with sulfate, roasted into clinker, leached and filtered, and the filtered lithium residue is washed or rinsed, and a countercurrent washing process and device are used for treatment. The countercurrent washing process is to wash the filtered lithium residue with a filter residue countercurrent washing device. The lithium extraction rate of the waste residue washed by the countercurrent washing process is increased by more than 30-40% compared with the existing one, and is suitable for industrial large-scale production.

[0010] The invention discloses a method for washing lithium mica roasting leaching filtering slag material, which comprises the following steps: fully mixing lithium mica or lithium ore raw material and sulfate, roasting to clinker, leaching and filtering to obtain filtering lithium slag material, which is processed by a countercurrent washing process method and device, wherein the countercurrent washing process method is to wash the filtering lithium slag by a filtering slag countercurrent washing device, and comprises the following steps: 1) mixing the filtering lithium slag material and water to form filtering lithium slag slurry; 2) conveying the filtering lithium slag slurry to a slurry output device of a filtering lithium slag slurry output unit on the filtering slag countercurrent washing device, and inputting the filtering lithium slag slurry to a conveyor belt by the slurry output device of the filtering lithium slag slurry output unit, so as to form a conveying filtering lithium slag on the conveyor belt;

[0011] 3) The functional washing and conveying devices arranged above the conveyor belt slowly filter and wash the conveying and filtering lithium slag formed during the conveying process on the conveyor belt at different positions on the conveyor belt to obtain washing liquid and washing slag.

[0012] The method for washing lepidolite roasting leaching filtration residue of the present invention comprises the following steps: the slow filtration washing is to control the conveying filtration lithium residue on the conveyor belt to keep in contact with the washing water for as long as possible, and to separate the washing liquid and the washing residue.

[0013] The filter residue countercurrent washing device of the present invention comprises a filter residue countercurrent washing device frame, a conveying device bracket arranged on the filter residue countercurrent washing device frame, and a washing conveying device is arranged on the conveying device bracket; the washing conveying device comprises a filtered lithium residue slurry output unit, a filtered lithium residue slurry slag uniform washing unit, a filtered lithium residue slurry strong washing unit and a washing conveyor;

[0014] The filtered lithium slag slurry output unit includes a slurry output device and a slurry slag washing conveyor; the slurry output device includes a slurry output bracket, a slurry trough, a discharge port, a slurry output pipe, and an anti-slurry adhesion portion; the slurry trough is arranged on the slurry output bracket, the discharge port is arranged at the lower part of the slurry trough, and corresponds to the conveyor belt above the washing and conveying device; the slurry output pipe is arranged above the slurry trough, and the anti-slurry adhesion portion is arranged in the inner cavity of the slurry trough.

[0015] The present invention discloses a method for washing slag filtered by roasting and leaching of lithium mica, wherein the filtering lithium slag slurry slag washing and uniforming unit comprises a slag buffer washer with grooves and a slag uniformizer; the slag buffer washer with grooves is arranged at the rear of the slurry output device along the conveying direction of the conveyor belt, and the slag uniformizer is arranged between the slag buffer washer with grooves and the slurry output device; the slag buffer washer with grooves comprises a slag buffer washing frame, a flushing water pipeline, a water outlet, an overflow trough, a washing slag pressing sheet, and an overflow notch; the flushing water pipeline and the overflow trough are arranged on the slag buffer washing frame, and the flushing water pipeline is controlled to be located above the overflow trough, the water outlet is arranged on the flushing water pipeline in the direction corresponding to the overflow trough, and the overflow notch is arranged on the overflow trough on one side of the conveying direction of the conveyor belt; the washing slag pressing sheet is arranged as a long strip structure, one end of which is connected to the outer wall below the overflow notch of the overflow trough, and the other end side is elastically pressed and contacted with the slag layer on the conveyor belt.

[0016] The method for washing the slag from roasting and leaching of lithium mica is preferably such that the anti-slurry bonding part includes a bearing seat, a first rotating shaft, a first gear, a transmission motor, a second gear, a second rotating shaft, and a slurry scraping plate. The first rotating shaft and the second rotating shaft are arranged side by side and in parallel in the inner cavity of the slurry tank. The end of the first rotating shaft extending out of the outer wall of the inner cavity of the slurry tank is connected to the bearing seat, the first gear and the transmission motor in sequence. The end of the second rotating shaft located on the outer wall of the inner cavity of the slurry tank is connected to the second gear, and the first gear and the second gear are correspondingly engaged; the slurry scraping plate is respectively connected to the first rotating shaft and the second rotating shaft, and is staggered and correspondingly arranged; the transmission motor drives the first rotating shaft and the first gear arranged on the first rotating shaft to rotate, and the first gear drives the second gear engaged therewith to rotate, and the second gear simultaneously drives the second rotating shaft to rotate.

[0017] The method for washing lepidolite roasting leaching filtered slag, wherein the filtered lithium slag slurry strong washing unit comprises a slotless slag strong flusher, and the slotless slag strong flusher comprises a strong flushing bracket, a strong flushing water supply pipeline, a connecting straight pipe, a strong flushing water outlet, a connecting tie, and a strong flushing permeable sheet; the strong flushing bracket is fixedly connected to the corresponding position of the conveying device bracket, the two ends of the strong flushing water supply pipeline are connected to the strong flushing bracket, one end of the connecting straight pipe is connected to the corresponding position of the strong flushing water supply pipeline, and the other end is connected to the water source pipe, a plurality of strong flushing water outlet holes are provided on the wall surface of the strong flushing water supply pipeline, one end of the strong flushing permeable sheet is connected to the strong flushing water supply pipeline through a connecting tie, and the other end is in contact with the slag layer on the conveyor belt; the cleaning water flushed out of the strong flushing water outlet is directly flushed on the strong flushing permeable sheet in contact with the slag layer.

[0018] The present invention discloses a method for washing slag from roasting and leaching filtration of lithium mica, wherein the slurry slag washing conveyor comprises a washing conveying film belt and a film belt conveying roller, wherein the film belt conveying roller drives the washing conveying film belt to rotate, and the washing conveying film belt is arranged on the upper surface of the conveyor belt of the washing conveying device.

[0019] The method for washing the filtered slag after roasting and leaching of lithium mica, wherein the washing conveyor comprises a conveyor roller, a conveyor belt, and a conveyor belt roller, and the conveyor roller and the conveyor belt roller drive the conveyor belt to rotate; a liquid storage groove is provided on the surface wall of the conveyor belt corresponding to the conveying and filtering lithium slag, and at the same time, the two sides of the conveyor belt are controlled to be higher than the surface wall of the conveyor belt.

[0020] The method for washing the filtered slag after roasting and leaching of lithium mica described in the present invention further has the feature that the washing conveying membrane belt adopts a semi-permeable fiber material layer conveying membrane structure, and the semi-permeable fiber material layer conveying membrane belt can control the washing contact time of the washing water when rinsing and washing the conveying and filtering lithium slag placed on the semi-permeable fiber material layer conveying membrane belt for washing.

[0021] The present invention discloses a method for washing filtered slag after roasting and leaching of lithium mica. The method adopts the above method steps and washing device structure. After lithium ore raw material powder obtained by crushing lithium mica or lithium ore and sulfate such as sodium sulfate, calcium sulfate or potassium sulfate are fully mixed and roasted into clinker, the clinker is leached and filtered, and the obtained filtered lithium slag, i.e., slag layer 13, is washed or rinsed. The washing method and device disclosed in the present invention clean the filtered lithium slag more cleanly, especially the cleaning and extraction rate of rare metal elements such as lithium, rubidium, cesium, etc. in the filtered lithium slag or slag layer 13 is high, which is improved by more than 30-40% compared with the prior art method and device. For example, in the detection of the washed slag after washing, the lithium in the washed slag by the washing method of the present invention is only 0.22%, while that in the prior art is 0.31%. In terms of lithium oxide, the lithium content is more than 0.09% lower than that in the prior art, i.e., the extraction rate is more than 30%, which greatly improves the extraction rate of lithium from lithium mica. The cleaning rates for various rare metals and other elements are shown in the table below.Second, the washing device disclosed in the present invention controls the surface structure of the conveyor belt 302, that is, the conveyor belt 302 is designed to be higher on both sides than in the middle, and a liquid storage groove 30201 is provided in the middle of the conveyor belt 302, and the liquid storage groove 30201 is continuously or discontinuously provided on the wall surface of the conveyor belt 302 on the side corresponding to the conveyor belt 302 and the washing conveyor film belt 401 and the conveyor filter lithium slag; thereby, the conveyor belt 302 can continuously wash the conveyor filter lithium slag, i.e., the filter lithium slag, in the process of conveying the conveyor filter lithium slag. The slag material, i.e., the slag material layer 13, is cleaned and washed, that is, the flushing and washing time of the conveying and filtering lithium slag, i.e., the filtering lithium slag material that needs to be cleaned is extended; at the same time, a washing conveying membrane belt 401 is provided on the surface of the conveying belt 302, and the conveying and filtering lithium slag, i.e., the filtering lithium slag material, is placed on the other side surface of the washing conveying membrane belt 401 opposite to the conveying belt 302. The present invention designs the washing conveying membrane belt 401 as a semi-permeable material layer structure, i.e., a semi-permeable fiber material layer conveying membrane structure. The so-called semi-permeable fiber material layer conveying membrane structure can be The speed of the washing water flow is controlled by adopting a stepped structure, and another structure is adopted in which the upper layer of the semi-permeable fiber material layer of the multi-layer structure has a large outflow pore size and the lower layer has a small outflow pore size; the semi-permeable fiber material layer transmission membrane structure can effectively control the flow time of the washing and rinsing water, that is, when the conveying and filtering lithium slag, that is, the slag layer 13 is placed on the washing conveying membrane belt 401 on the conveyor belt 302, the washing water can greatly prolong the residence time when rinsing the conveying and filtering lithium slag on the washing conveying membrane belt 401, that is, prolong the contact time between the washing water and the conveying and filtering lithium slag, so that the conveying and filtering lithium slag that needs to be rinsed and washed above the conveyor belt 302 can be fully cleaned and washed, that is, the clean cleaning of the filtered lithium slag is achieved, so that the rare metal elements such as lithium in the filtered lithium slag will be washed into the cleaning liquid, that is, the mother liquor, and under the same conditions, the lithium content in the mother liquor can be greatly increased, that is, under the same conditions, the content of lithium and other elements in the lithium slag after washing is lower, and the extraction of lithium salts is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , is a schematic diagram of the front view of the device structure of the method for washing the slag after calcination and leaching of lithium mica according to the present invention,

[0023] Figure 2 , for the invention Figure 1 Top view,

[0024] Figure 3 , for the present invention Figure 2 The cross-sectional diagram along the AA direction in FIG. 8 is a cross-sectional diagram of the slurry discharger 8,

[0025] Figure 4 ,for Figure 3 Schematic diagram of cross section along EE direction,

[0026] Figure 5 ,for Figure 4 Schematic diagram of the cross section along the FF direction,

[0027] Figure 6 ,for Figure 2 Schematic diagram of the cross section along BB,

[0028] Figure 7 ,for Figure 6 Schematic diagram of the cross section along GG direction,

[0029] Figure 8 ,for Figure 2 Schematic diagram of the cross section along CC direction,

[0030] Fig. 9 ,for Figure 8 Schematic diagram of the cross section along the HH direction,

[0031] Fig.10 ,for Figure 2 Schematic diagram of cross section along DD direction,

[0032] Fig.11 ,for Fig.10 Schematic diagram of the cross-section along the JJ direction.

[0033] In the figure, 1, filter residue countercurrent washing device frame, 2, conveying device bracket, 3, washing conveyor, 301, conveying roller, 302, conveyor belt, 303, conveyor belt roller, 4, slurry residue washing conveyor, 401, washing conveying film belt, 402, film belt conveying roller, 5, film belt conveying bracket, 6, pressure roller, 7, film belt cleaning nozzle, 8, slurry output device, 801, slurry output bracket, 802, slurry tank, 803, discharge port, 804, slurry output pipe, 805, bearing seat, 806, first rotating shaft, 807, first gear, 808, transmission motor, 809, second gear, 8010, Two rotating shafts, 8011, scraper slag plate, 9, slag buffer washer with grooves, 901, slag buffer washing rack, 902, flushing water pipeline, 903, water outlet, 904, overflow trough, 905, washing slag pressing sheet, 906, overflow notch, 10, slag uniformizer, 1001, slag uniform beam, 1002, elastic slag pressing film, 11, strong flusher for slag without grooves, 1101, strong flushing bracket, 1102, strong flushing water supply pipeline, 1103, connecting straight pipe, 1104, strong flushing water outlet, 1105, connecting tie, 1106, strong flushing permeable sheet, 12, washing slag collector, 13, slag layer. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the foregoing general description of the present invention and the following specific embodiments are exemplary and illustrative and are used to provide further explanation of the invention to be protected.

[0035] like Figure 1-2 As shown, the present invention discloses a method for washing lithium mica roasted leached filtered slag, which is to fully mix lithium mica or lithium ore raw materials and sulfate, roast them into clinker, leach and filter them, and obtain filtered lithium slag as the raw material for washing, and use a countercurrent washing process method and device to treat the filtered lithium slag. The countercurrent washing process method is to wash the filtered lithium slag with a filter slag countercurrent washing device, including the following method steps: 1) stirring and fully mixing the filtered lithium slag and water to obtain filtered lithium slag slurry, 2) The filtered lithium slag slurry is transported to the slurry output device 8 of the filtered lithium slag slurry output unit on the filtered lithium slag countercurrent washing device, and the filtered lithium slag slurry is input to the conveyor belt by the slurry output device 8 of the filtered lithium slag slurry output unit to form a conveyed filtered lithium slag on the conveyor belt 302; 3) the conveyed filtered lithium slag formed in the conveying process on the conveyor belt 302 is slowly filtered and washed at different positions on the conveyor belt 302 by various functional washing and conveying devices arranged above the conveyor belt to obtain washing liquid and washing slag, and the washing liquid is the mother liquor for extracting lithium salt.

[0036] The slow filtering and washing is to control the conveying and filtering lithium slag on the conveyor belt 302 to keep in contact with the washing water for as long as possible, so as to separate the washing liquid and the washing slag. The so-called contact washing for as long as possible is to control the contact flushing or washing time of the conveying and filtering lithium slag with the washing water when it is on the washing conveying membrane belt 401 and the conveyor belt 302 to be extended as much as possible, that is, to keep the conveying and filtering lithium slag and the washing water in contact with the washing water as much as possible during the process of conveying and transporting on the washing conveying membrane belt 401 on the entire conveyor belt 302. In order to achieve the above-mentioned purpose and effect of the long-term contact washing between the conveying and filtering lithium slag and the washing water, a semi-permeable fiber material layer is used as the material of the washing conveying membrane belt 401, which can slow down the speed of the washing water penetrating the washing conveying membrane belt 401 and the conveying and filtering lithium slag thereon, that is, the washing conveying membrane belt 401 is prepared by using a semi-permeable material. On the other hand, a plurality of regular or irregular liquid storage grooves 30201 are provided on the wall surface of the conveyor belt 302 on one side in contact with the conveying and filtering lithium slag. After the washing water is used to flush and wash the conveying and filtering lithium slag, part of it is retained in the liquid storage groove 30201. Figure 7 , 9 As shown in the figure, the washing liquid in the groove is in contact with the conveying and filtering lithium slag during the whole conveying process. The parts not described in the following embodiments are the same as the above description. Example

[0037] The present invention discloses a method for washing lepidolite roasting leaching filtering residue, which comprises the following steps: fully mixing lepidolite or lithium ore raw material and sulfate, roasting to clinker, leaching and filtering to obtain filtering lithium residue. The raw material of lepidolite or lithium ore crushed in this embodiment is preliminarily tested for its main chemical components, as shown in the following table (wt%), with the remainder being fluorine and other small amounts of substances.

[0038] Table 1;

[0039]

[0040] The method is to use a countercurrent washing process and a device to treat the filtered lithium slag; Figure 1-11 As shown, the filter residue countercurrent washing device of the present invention comprises a filter residue countercurrent washing device frame 1, a conveying device support 2 arranged on the filter residue countercurrent washing device frame 1, and a washing conveying device is arranged on the conveying device support 2; the washing conveying device comprises a filtered lithium slag slurry output unit, a filtered lithium slag slurry slag uniform washing unit, a filtered lithium slag slurry strong washing unit and a washing conveyor 3; as shown Figure 1-2 As shown; the washing conveyor 3 includes a conveyor roller 301, a conveyor belt 302, and a conveyor belt roller 303, and the conveyor roller 301 and the conveyor belt roller 303 drive the conveyor belt 302 to rotate; a liquid storage groove 30201 is provided on the surface wall of the conveyor belt 302 corresponding to the conveying and filtering lithium slag, and at the same time, the two sides of the conveyor belt 302 are controlled to be higher than the surface wall of the conveyor belt 302; the conveyor roller 301 is provided on the conveyor device bracket 2, and the conveyor roller 301 drives the conveyor belt 302 to rotate continuously on the conveyor device bracket 2, and the conveyor belt roller 303 is used for the tension and relaxation of the conveyor belt 302, that is, for adjusting the tightness of the conveyor belt 302, so as to ensure that the conveyor belt 302 and the washing conveyor film belt 401 convey and wash the conveying and filtering lithium slag;

[0041] like Figure 1 , 2As shown, the slurry slag washing conveyor 4 includes a washing conveying film belt 401 and a film belt conveying roller 402. The film belt conveying roller 402 drives the washing conveying film belt 401 to rotate. The washing conveying film belt 401 is arranged on the upper surface of the conveyor belt 302 of the washing conveying device and generally moves synchronously; after the washing conveying film belt 401 is conveyed and rotated for one circle on the film belt conveying roller 402, the film belt cleaning nozzle 7 arranged on the film belt conveying bracket 5 sprays cleaning water to continuously spray and clean the surface of the washing conveying film belt 401; the washing conveying film belt 401 is pressed by the pressing roller 6 so that the side of the washing conveying film belt 401 corresponding to the conveyor belt 302 is pressed tightly against the surface of the conveyor belt 302 on the side where the liquid storage groove 30201 is provided. In this embodiment, the washing conveying membrane belt 401 adopts a semi-permeable fiber material layer conveying membrane structure. The semi-permeable fiber material layer conveying membrane belt can control the washing contact time of the washing water when rinsing and washing the conveying filtering lithium slag placed on the semi-permeable fiber material layer conveying membrane belt, that is, to ensure that the contact washing time of the washing water is extended as much as possible. The washing slag or the conveying filtering lithium slag, that is, the slag layer 13 is finally collected by the washing slag collector 12.

[0042] like Figure 3-5 As shown in , 8, the filtered lithium slag slurry output unit includes a slurry output device 8 and a slurry slag washing conveyor 4; the slurry output device 8 includes a slurry output bracket 801, a slurry tank 802, a discharge port 803, a slurry output pipe 804, and an anti-slurry adhesion portion; the slurry tank 802 is arranged on the slurry output bracket 801, the discharge port 803 is arranged at the lower part of the slurry tank 802, and corresponds to the conveyor belt 302 above the washing and conveying device; the slurry output pipe 804 is arranged above the slurry tank 802, and the anti-slurry adhesion portion is arranged in the inner cavity of the slurry tank 802, as shown in Figure 5As shown; the anti-slurry bonding part includes a bearing seat 805, a first rotating shaft 806, a first gear 807, a transmission motor 808, a second gear 809, a second rotating shaft 8010, and a scraping slag plate 8011. The first rotating shaft 806 and the second rotating shaft 8010 are arranged side by side and in parallel in the inner cavity of the slurry tank 802. The end of the first rotating shaft 806 extending out of the outer wall of the inner cavity of the slurry tank 802 is connected to the bearing seat 805, the first gear 807 and the transmission motor 808 in sequence. The second rotating shaft 8010 is located in the slurry tank 802. A second gear 809 is connected to one end of the outer wall of the inner cavity, and the first gear 807 and the second gear 809 are correspondingly engaged; the scraper plate 8011 is respectively connected to the first rotating shaft 806 and the second rotating shaft 8010, and is arranged correspondingly in a staggered manner; the transmission motor 808 drives the first rotating shaft 806 and the first gear 807 arranged on the first rotating shaft 806 to rotate, and the first gear 807 drives the second gear 809 engaged therewith to rotate, and the second gear 809 simultaneously drives the second rotating shaft 8010 to rotate. Since the filtered lithium slag slurry has a certain degree of adhesion, when the filtered lithium slag slurry is input into the slurry tank 802, it is very easy to adhere to the inner wall surface of the slurry tank 802, thereby greatly affecting the filtered lithium slag slurry from the slurry tank 802 to flow evenly onto the surface of the washing conveyor film belt 401 above the conveyor belt 302; by staggeredly arranging the scraper slag plate 8011 on the first rotating shaft 806 and the second rotating shaft 8010, the filtered lithium slag slurry in the slurry tank 802 can flow out evenly from the discharge port 803 onto the surface of the washing conveyor film belt 401; the washing water can conveniently and evenly rinse it;

[0043] like Figure 6 , 7 As shown, the slag washing and uniforming unit for filtering lithium slag slurry comprises a slag buffer washer with grooves 9 and a slag uniformizer 10; the slag buffer washer with grooves 9 is arranged behind the slurry output device 8 along the conveying direction of the conveyor belt 302, and the slag uniformizer 10 is arranged between the slag buffer washer with grooves 9 and the slurry output device 8; a plurality of slag uniformizers 10 and slag buffer washers with grooves 9 are arranged at intervals above the conveyor bracket 2; 2-5 slag uniformizers 10 and slag buffer washers with grooves 9 can be arranged according to the size of the production volume, and this embodiment is to arrange two A slotted slag buffer washer 9 is provided between the slotted slag buffer washer 9 and the four slag homogenizers 10, i.e., two slag homogenizers 10. The washing liquid or mother liquor after each flushing is collected from the mother liquor tank below the conveyor belt 302 and transported to the mother liquor storage tank through a conveying pipeline. Generally, the mother liquor tank is arranged in the middle of the conveyor belt 302, so that the filtered lithium slag slurry can be cleaned more cleanly. The slag layer 13 after flushing is flattened by the washing slag pressing sheet 905, which is convenient for conveying and washing, so that the lithium content in the washed slag is greatly reduced.

[0044] like Figure 6 , 7As shown, the slag buffer washer with grooves 9 includes a slag buffer washing frame 901, a flushing water pipe 902, a water outlet 903, an overflow trough 904, a slag washing sheet 905, and an overflow notch 906; the flushing water pipe 902 and the overflow trough 904 are arranged on the slag buffer washing frame 901, and the flushing water pipe 902 is controlled to be located above the overflow trough 904, the water outlet 903 is arranged on the flushing water pipe 902 in the direction corresponding to the overflow trough 904, and the overflow notch 906 is arranged on the overflow trough 904 on one side of the conveying direction of the conveyor belt 302; the slag washing sheet 905 is set as a long strip structure, one end of which is connected to the outer wall below the overflow notch 906 of the overflow trough 904, and the other end side is elastically pressed and contacted with the slag layer 13 on the conveyor belt 302. Figure 7 As shown, after the flushing water of the flushing water pipe 902 rushes into the inner cavity of the overflow groove 904 from the water outlet 903, the overflowing flushing water flows out from the overflow groove mouth 906 along the washing slag press sheet 905 in contact with the overflow groove 904, and the washing slag press sheet 905 slowly penetrates into the slag layer 13 on the surface of the washing conveying membrane belt 401 on the conveyor belt 302 for slow washing. At the same time, since the washing slag press sheet 905 has a certain elastic pressure, it can flatten the slag layer 13 located on the washing conveying membrane belt 401, thereby maximally ensuring that the washing water or flushing water can fully contact and wash with all the slag layers 13, i.e., the conveying and filtering lithium slag.

[0045] like Fig.10 , 11 As shown, the filtered lithium slag slurry strong washing unit includes a slotless slag strong washer 11, and the slotless slag strong washer 11 includes a strong washing bracket 1101, a strong washing water supply pipeline 1102, a connecting straight pipe 1103, a strong washing water outlet 1104, a connecting tie 1105, and a strong washing permeable sheet 1106; the strong washing bracket 1101 is fixedly connected to the corresponding position of the conveying device bracket 2, the two ends of the strong washing water supply pipeline 1102 are fixedly connected to the strong washing bracket 1101, and one end of the connecting straight pipe 1103 is connected to the corresponding position of the strong washing water supply pipeline 1102. The other end is connected to the water source pipe, and a plurality of strong flushing water outlet holes 1104 are provided on the wall of the strong flushing water supply pipe 1102. One end of the strong flushing water permeable sheet 1106 is connected to the strong flushing water supply pipe 1102 through a connecting tie 1105, and the other end is in contact with the slag layer 302 on the conveyor belt 302; the cleaning water flushed out of the strong flushing water outlet holes 1104 is directly flushed on the strong flushing water permeable sheet 1106 in contact with the slag layer 302, and the flushing water passed through the strong flushing water permeable sheet 1106 can not only wash the slag layer 302, but also further make the slag layer 302 smoother.

[0046] By using the method for washing the lepidolite roasting leaching and filtering residue disclosed in the present invention, the above raw materials are rinsed and washed, and the main components of the elements in the washed residue after washing are tested by a certain analysis and testing company in Foshan City, Guangdong Province. The test results are as follows:

[0047] Name: Filter tailings, i.e. washing residues from the embodiment,

[0048] Sample sending unit: The inventor's company,

[0049] Quantity of test samples: about 200g,

[0050] Test experimental environment temperature and humidity: 25 degrees, 68% RH,

[0051] Testing category: commissioned testing,

[0052] Testing basis: GB / T16537-2010, GB / T14734-1996, GB / T14506.28-2010.

[0053] Table 2

[0054]

[0055] Note: Table 2 above shows the main metal element component detection data after washing the filtered lithium slag after the above-mentioned lithium mica raw material was roasted, leached and filtered using a lithium mica roasting, leaching and filtering slag washing method disclosed in the present invention.

[0056] The unexplained parts in the following embodiments are the same as the technical solutions of the above-mentioned specific implementation methods. Example

[0057] The raw material of the pulverized lithium mica or lithium ore used in this embodiment is the same as the raw material used in the embodiment of the present invention; the main chemical components thereof are preliminarily detected as shown in the following table (wt%), and the remainder is fluorine and other small amounts of impurities.

[0058] Table 1;

[0059]

[0060] The other process steps are the same, that is, after roasting to clinker, leaching, filtering, the filtered lithium slag is also the same, but the existing washing process method and device in the art are used to wash the filtered lithium slag; for example, the filtered lithium slag is directly placed on a conveying device and directly rinsed and washed with washing water, and the detection conditions are the same. The specific results are shown in Table 3 below;

[0061] The main components of the elements in the washing residue after washing were tested by a certain analysis and testing company in Foshan City, Guangdong Province. The results are as follows:

[0062] Name: Filter tailings, i.e. washing residues from the embodiment,

[0063] Sample sending unit: Inventor's company,

[0064] Quantity of test samples: about 200g,

[0065] Test experimental environment temperature and humidity: 25 degrees, 68% RH,

[0066] Testing category: commissioned testing,

[0067] Testing basis: GB / T16537-2010, GB / T14734-1996, GB / T14506.28-2010.

[0068] Table 3

[0069]

[0070] Note: Table 2 above shows the main metal element component detection data of the lithium mica raw material after being washed and washed by a method for washing lithium mica roasting, leaching and filtering residue disclosed in the present invention. And Table 3 above shows that the content of the main metals such as lithium (calculated as lithium oxide) in the washing residue is less than 40.9% by using the existing technology. The lithium content in the washing residue of the present invention is 0.22%, while the lithium content in the existing technology method is 0.31%; rubidium is also calculated as rubidium oxide, the present invention is 1.13%, while the existing technology is 1.04%; the content in the washing residue is less than 10.9% rubidium. It shows that the washing of the filtered lithium residue by the method of the present invention is more thorough. The lithium oxide in the filtered lithium residue enters the washing liquid after being washed by the method of the present invention. Under the same conditions, the content of lithium ions in the washing liquid is increased. Thereby, the extraction rate of lithium in the lithium mica is improved.

Claims

1. A method for washing lepidolite roasting leaching filtering residue, comprising the steps of fully mixing lepidolite raw material and sulfate, roasting to a clinker, leaching, filtering, and obtaining a filtering lithium residue, wherein the method comprises the following steps: The process is treated by a countercurrent washing method, wherein the countercurrent washing method is to wash the filtered lithium slag by a filter slag countercurrent washing device, and comprises the following steps: 1) mixing the filtered lithium slag material and water to form a filtered lithium slag slurry; 2) transporting the filtered lithium slag slurry to the slurry output device of the filtered lithium slag slurry output unit on the filtered lithium slag countercurrent washing device, and the slurry output device of the filtered lithium slag slurry output unit inputs the filtered lithium slag slurry to the conveyor belt to form a conveyor belt for conveying the filtered lithium slag; 3) The functional washing and conveying devices arranged above the conveyor belt slowly filter and wash the conveying and filtering lithium slag formed during the conveying process on the conveyor belt at different positions on the conveyor belt to obtain washing liquid and washing slag; The filter residue countercurrent washing device comprises a filter residue countercurrent washing device frame, a conveying device bracket arranged on the filter residue countercurrent washing device frame, and a washing conveying device is arranged on the conveying device bracket; The washing and conveying device comprises a filtered lithium slag slurry output unit, a filtered lithium slag slurry slag uniform washing unit, a filtered lithium slag slurry strong washing unit and a washing conveyor; The filtered lithium slag slurry output unit includes a slurry output device and a slurry slag washing conveyor; the slurry output device includes a slurry output bracket, a slurry tank, a discharge port, a slurry output pipe, and a slurry adhesion prevention part; The slurry tank is arranged on the slurry output bracket, and the discharge port is arranged at the lower part of the slurry tank and corresponds to the conveyor belt above the washing and conveying device; The slurry output pipe is arranged above the slurry tank, and the slurry adhesion prevention part is arranged in the inner cavity of the slurry tank; The slurry slag washing conveyor comprises a washing conveying film belt and a film belt conveying roller, the film belt conveying roller drives the washing conveying film belt to rotate, and the washing conveying film belt is arranged on the upper surface of the conveying belt of the washing conveying device; The washing conveyor comprises a conveyor roller, a conveyor belt, and a conveyor belt roller, wherein the conveyor roller and the conveyor belt roller drive the conveyor belt to rotate; a liquid storage groove is provided on the surface of the conveyor belt corresponding to the side of the conveyor belt for conveying and filtering lithium slag, and at the same time, the two sides of the conveyor belt are controlled to be higher than the surface of the conveyor belt; The washing conveying membrane belt adopts a semi-permeable fiber material layer conveying membrane structure, and the semi-permeable fiber material layer conveying membrane belt can control the washing contact time of the washing water when flushing and washing the conveying and filtering lithium slag material placed on the semi-permeable fiber material layer conveying membrane belt for washing.

2. The method for washing slag material by calcining and leaching lepidolite according to claim 1, wherein The slag washing and uniforming unit for filtering lithium slag slurry comprises a slag buffer washer with grooves and a slag uniformizer; the slag buffer washer with grooves is arranged at the rear of the slurry output device along the conveying direction of the conveyor belt, and the slag uniformizer is arranged between the slag buffer washer with grooves and the slurry output device; the slag buffer washer with grooves comprises a slag buffer washing frame, a washing water pipeline, a water outlet, an overflow trough, a washing slag pressing sheet, and an overflow notch; the washing water pipeline and the overflow trough are arranged on the slag buffer washing frame, and the washing water pipeline is controlled to be located above the overflow trough, the water outlet is arranged on the washing water pipeline in the direction corresponding to the overflow trough, and the overflow notch is arranged on the overflow trough on one side of the conveying direction of the conveyor belt; the washing slag pressing sheet is arranged as a long strip structure, one end of which is connected to the outer wall surface below the overflow notch of the overflow trough, and the other end side is elastically pressed and contacted with the slag layer on the conveyor belt.

3. The method for washing slag material by roasting and leaching lepidolite according to claim 1, wherein The anti-slurry bonding part includes a bearing seat, a first rotating shaft, a first gear, a transmission motor, a second gear, a second rotating shaft, and a scraper plate. The first rotating shaft and the second rotating shaft are arranged side by side and in parallel in the inner cavity of the slurry tank. The end of the first rotating shaft extending out of the outer wall of the inner cavity of the slurry tank is connected to the bearing seat, the first gear and the transmission motor in sequence. The end of the second rotating shaft located on the outer wall of the inner cavity of the slurry tank is connected with the second gear, and the first gear and the second gear are engaged with each other; the scraper plate is respectively connected to the first rotating shaft and the second rotating shaft, and is staggered and correspondingly arranged; the transmission motor drives the first rotating shaft and the first gear arranged on the first rotating shaft to rotate, and the first gear drives the second gear engaged with it to rotate, and the second gear drives the second rotating shaft to rotate at the same time.

4. The method for washing slag material by roasting and leaching lepidolite according to claim 1, wherein The filtered lithium slag slurry strong washing unit comprises a slotless slag strong washer, which comprises a strong washing bracket, a strong washing water supply pipeline, a connecting straight pipe, a strong washing water outlet, a connecting tie, and a strong washing permeable sheet; the strong washing bracket is fixedly connected to the corresponding position of the conveying device bracket, both ends of the strong washing water supply pipeline are connected to the strong washing bracket, one end of the connecting straight pipe is connected to the corresponding position of the strong washing water supply pipeline, and the other end is connected to the water source pipe, a plurality of strong washing water outlet holes are arranged on the wall surface of the strong washing water supply pipeline, one end of the strong washing permeable sheet is connected to the strong washing water supply pipeline through a connecting tie, and the other end is in contact with the slag layer on the conveyor belt; the cleaning water flushed out of the strong washing water outlet is directly flushed on the strong washing permeable sheet in contact with the slag layer.

Images