Lepidolite treatment system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2026-08-11
AI Technical Summary
[0004]本实用新型的主要目的在于提供锂云母处理系统，以解决现有技术中碳酸锂品质差、纯化操作复杂困难和系统稳定性差的技术问题
[0026] The advantages of this lithium mica treatment system are as follows: First, before lithium precipitation, potassium chloride is extracted from the first clear liquid through a crystallization device, a second solid-liquid separation device, and a washing device, preventing potassium chloride from continuously accumulating during the circulation of the lithium precipitation mother liquor and causing a decline in the quality of lithium carbonate. Second, before lithium precipitation, impurity ions such as calcium and magnesium ions are removed from the second clear liquid through a purification device. Since potassium chloride has also been crystallized and extracted, the lithium ion purity in the purified liquid is high, resulting in high-purity lithium carbonate. Furthermore, because the purified liquid contains fewer impurity ions, the lithium precipitation mother liquor also contains very few impurity ions; therefore, the recycling of the lithium precipitation mother liquor has almost no impact on the lithium precipitation effect.
Smart Images
Figure CN224613207U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lithium carbonate production, and more specifically, to a lithium mica processing system. Background Technology
[0002] Chlorination roasting is a common process for extracting lithium from lepidolite. The core of this method is the reaction of the ore with a chlorinating agent (such as potassium chloride) under high-temperature conditions, converting lithium into water-soluble lithium chloride. The traditional process flow of chlorination roasting is as follows: lepidolite ore crushing and grinding → lepidolite powder mixed with a chlorinating agent → high-temperature roasting to obtain chlorinated clinker → leaching of the chlorinated clinker with water → filtration or sedimentation → lithium precipitation → purification → lithium carbonate product.
[0003] The roasting product obtained from high-temperature roasting is usually called chloride clinker. In addition to lithium chloride, it also contains a large amount of potassium chloride. During the recycling of the lithium precipitation mother liquor, potassium chloride continuously accumulates, causing the final lithium carbonate quality to gradually decline with the production cycle. At the same time, the purification operation is set up to purify the lithium carbonate precipitate after lithium precipitation. The purification operation is not only more complicated and difficult (such as multiple calcination and dissolution treatments), but the impurities in the filtrate or the clear liquid obtained from sedimentation may not only affect the lithium precipitation process, but also remain in the lithium precipitation mother liquor, continuously affecting the stability of the system during the recycling of the lithium precipitation mother liquor. Utility Model Content
[0004] The main purpose of this invention is to provide a lithium mica processing system to solve the technical problems of poor lithium carbonate quality, complex and difficult purification operations, and poor system stability in the prior art.
[0005] To achieve the above objectives, this utility model provides a lithium mica processing system, the technical solution of which is as follows:
[0006] The lithium mica processing system includes:
[0007] A roasting furnace, wherein the roasting furnace is used to roast lepidolite powder and potassium chloride to output chlorinated clinker;
[0008] A leaching tank is used to leach chlorinated clinker and output a first solid-liquid mixture and a supernatant.
[0009] A first solid-liquid separation device is used to perform solid-liquid separation treatment on a first solid-liquid mixture and output a first clear liquid;
[0010] A crystallization device, wherein the crystallization device is used to crystallize potassium chloride from a first clear liquid and a supernatant, and output a second solid-liquid mixture;
[0011] The second solid-liquid separation device is used to perform solid-liquid separation treatment on the second solid-liquid mixture and output a second clear liquid and a second solid.
[0012] A washing device for washing a second solid, outputting potassium chloride solid and wash water;
[0013] A purification device, wherein the purification device is used to remove impurities from the second clear liquid and the wash water, and outputs a purified liquid;
[0014] A lithium precipitation reactor, which is used to convert lithium ions in the purification liquid into lithium carbonate for precipitation, to obtain a third solid-liquid mixture;
[0015] The third solid-liquid separation device is used to perform solid-liquid separation treatment on the third solid-liquid mixture, and outputs a third clear liquid and lithium carbonate solid.
[0016] The third clear liquid outlet of the third solid-liquid separation device is connected to the solvent inlet of the leaching tank.
[0017] As a further improvement to the above-mentioned lithium mica processing system, the crystallization equipment is a vacuum crystallizer.
[0018] As a further improvement to the above-mentioned lithium mica processing system, a drying device is also included, which dries potassium chloride solid.
[0019] As a further improvement to the above-mentioned lithium mica processing system, the drying equipment is any one of a rotary drum dryer, a fluidized bed dryer, and an airflow dryer.
[0020] As a further improvement to the aforementioned lepidolite processing system, a granulation device is also included, which granulates the dried potassium chloride solid to obtain the potassium chloride product.
[0021] As a further improvement to the aforementioned lithium mica processing system, the granulation equipment includes a double-roller tablet press, a crusher, and a powder sieve.
[0022] As a further improvement to the aforementioned lithium mica processing system, a freshwater storage tank is also included, which is connected to the solvent inlet of the leaching tank.
[0023] As a further improvement to the above-mentioned lithium mica treatment system, the purification equipment is at least one of an adsorption device, an extraction device, and a chemical precipitation device.
[0024] As a further improvement to the aforementioned lithium mica processing system, a first intermediate tank is also included for storing the first clear liquid and the supernatant.
[0025] As a further improvement to the aforementioned lithium mica processing system, a second intermediate tank is also included for storing the second clear liquid and wash water.
[0026] The advantages of this lithium mica treatment system are as follows: First, before lithium precipitation, potassium chloride is extracted from the first clear liquid through a crystallization device, a second solid-liquid separation device, and a washing device, preventing potassium chloride from continuously accumulating during the circulation of the lithium precipitation mother liquor and causing a decline in the quality of lithium carbonate. Second, before lithium precipitation, impurity ions such as calcium and magnesium ions are removed from the second clear liquid through a purification device. Since potassium chloride has also been crystallized and extracted, the lithium ion purity in the purified liquid is high, resulting in high-purity lithium carbonate. Furthermore, because the purified liquid contains fewer impurity ions, the lithium precipitation mother liquor also contains very few impurity ions; therefore, the recycling of the lithium precipitation mother liquor has almost no impact on the lithium precipitation effect.
[0027] Therefore, the lithium mica processing system of this utility model has a simple structure, low equipment investment and operating costs, is easy to operate and control, can operate stably for a long time, can achieve deep resource recovery and utilization of potassium chloride, and produces high-quality lithium carbonate products. It effectively solves the technical problems of poor lithium carbonate quality, complex and difficult purification operation and poor system stability in the prior art, and has strong practicality.
[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description
[0029] The accompanying drawings, which form part of this utility model, are used to aid in understanding this utility model. The content provided in the drawings and the related descriptions in this utility model can be used to explain this utility model, but do not constitute an undue limitation of this utility model. In the drawings:
[0030] Figure 1 This is a schematic diagram of an embodiment of the lithium mica processing system of this utility model.
[0031] The relevant markings in the above figures are:
[0032] 110-Roasting furnace, 120-Leaching tank, 130-First solid-liquid separation equipment, 140-Fresh water storage tank, 210-Crystallization equipment, 220-Second solid-liquid separation equipment, 230-Washing equipment, 240-Drying equipment, 250-Granulation equipment, 310-Purification equipment, 320-Lithium precipitation reactor, 330-Third solid-liquid separation equipment, 410-First intermediate tank, 420-Second intermediate tank. Detailed Implementation
[0033] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:
[0034] The technical solutions and features provided in the various parts of this utility model, including the following description, can be combined with each other without conflict.
[0035] Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the protection scope of the present invention.
[0036] Regarding the terminology and units used in this utility model: The terms "comprising," "having," and any variations thereof in the specification, claims, and related parts of this utility model are intended to cover non-exclusive inclusion.
[0037] Figure 1 This is a schematic diagram of an embodiment of the lithium mica processing system of this utility model.
[0038] like Figure 1 The lithium mica processing system shown mainly includes a roasting furnace 110, a leaching tank 120, a first solid-liquid separation device 130, a crystallization device 210, a second solid-liquid separation device 220, a washing device 230, a drying device 240, a granulation device 250, a purification device 310, a lithium precipitation reactor 320, a third solid-liquid separation device 330, a first intermediate tank 410, and a second intermediate tank 420.
[0039] The roasting furnace 110 is used to roast lepidolite powder and potassium chloride to output chlorinated clinker. Preferably, the lepidolite ore is crushed into lepidolite powder using a crushing device before roasting, which can improve roasting efficiency. In the mixture of lepidolite powder and potassium chloride, the mass fraction of potassium chloride is 10-20%. When the roasting temperature is 800-1000℃, lepidolite reacts with potassium chloride to produce chlorinated clinker containing lithium chloride.
[0040] The leaching tank 120 is used to leach chlorinated clinker, so that lithium chloride in the chlorinated clinker dissolves in water, and outputs a first solid-liquid mixture and supernatant. A fresh water storage tank 140 is connected to the solvent inlet of the leaching tank 120 to supply solvent water to the leaching tank 120. In order to improve the leaching efficiency, the leaching tank 120 is equipped with a steam heating jacket, so that the leaching temperature is 105°C. A settling tank is provided at the bottom of the leaching tank 120, and undissolved salt residue settles in the settling tank, thus forming the first solid-liquid mixture.
[0041] The first solid-liquid separation device 130 is used to perform solid-liquid separation treatment on the first solid-liquid mixture, and outputs a first clear liquid and a first solid. The first solid-liquid separation device 130 is preferably a plate and frame filter press or a centrifuge. A reflux pipe is provided between the material inlet of the leaching tank 120 and the first solid outlet of the first solid-liquid separation device 130, so that the first solid can circulate between the leaching tank 120 and the first solid-liquid separation device 130 to improve the leaching efficiency.
[0042] The crystallization device 210 is used to crystallize potassium chloride from the first clear liquid and the supernatant, outputting a second solid-liquid mixture. The crystallization device 210 is a vacuum crystallizer, preferably a DTB (Draft Tabe Baffle) crystallizer, which is beneficial for obtaining potassium chloride with an average particle size of 1 mm. Preferably, the first clear liquid and the supernatant are temporarily stored in the first intermediate tank 410, which can make the system operation more stable.
[0043] The second solid-liquid separation device 220 is used to perform solid-liquid separation treatment on the second solid-liquid mixture, and output a second clear liquid and a second solid; the second solid-liquid separation device 220 is preferably a centrifuge, and the water content of the obtained second solid is about 1 to 9%.
[0044] The washing equipment 230 is used to wash the second solid and output potassium chloride solid and wash water. The wash water contains lithium resources. The second clear liquid and the wash water are mixed in the second intermediate tank 420 and then purified and lithium is extracted, which can make the lithium resources more recyclable. At the same time, after the pressure is stabilized in the second intermediate tank 420, it enters the purification equipment 310, which can make the system operate more stably.
[0045] The drying equipment 240 dries potassium chloride solid; the drying equipment 240 is any one of a rotary dryer, a fluidized bed dryer, and an airflow dryer.
[0046] The granulation equipment 250 granulates the dried potassium chloride solid to obtain potassium chloride product. The granulation equipment 250 includes a double-roller tablet press, a crusher, and a sieve. The double-roller tablet press first presses the potassium chloride solid into flakes of a certain thickness, and then the crusher and sieve process it to obtain potassium chloride product with a particle size of 2-4 mm.
[0047] The purification device 310 is used to remove impurities from the second clear liquid and the wash water, and outputs a purified liquid. The purification device 310 is at least one of an adsorption device, an extraction device, and a chemical precipitation device. Preferably, a combination of two purification devices (such as using a chemical precipitation device first and then an adsorption device) can improve the purification effect and thus improve the purity of lithium carbonate.
[0048] The lithium precipitation reactor 320 is used to convert lithium ions in the purification liquid into lithium carbonate for precipitation, resulting in a third solid-liquid mixture; sodium carbonate can be used as the precipitant.
[0049] The third solid-liquid separation device 330 is used to separate the third solid-liquid mixture, outputting a third clear liquid and lithium carbonate solid. The third solid-liquid separation device 330 is preferably a centrifuge. The outlet of the third clear liquid from the third solid-liquid separation device 330 is connected to the solvent inlet of the leaching tank 120, thereby allowing the relatively pure third clear liquid to be used as a solvent, significantly saving fresh water consumption and minimizing system disturbance. After conventional washing, drying, and granulation, the lithium carbonate solid is then obtained as the lithium carbonate product.
[0050] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the above description of this utility model without inventive effort should fall within the protection scope of this utility model.
Claims
1. A lithium mica processing system, comprising: A calcining furnace (110) is used to calcinate lepidolite powder and potassium chloride to output chlorinated clinker. The leaching tank (120) is used to leach chlorinated clinker and output a first solid-liquid mixture and a supernatant. The first solid-liquid separation device (130) is used to perform solid-liquid separation treatment on the first solid-liquid mixture and output the first clear liquid; Its characteristic is that it also includes: Crystallization apparatus (210), the crystallization apparatus (210) is used to crystallize potassium chloride from the first clear liquid and the supernatant and output a second solid-liquid mixture; The second solid-liquid separation device (220) is used to perform solid-liquid separation treatment on the second solid-liquid mixture and output the second clear liquid and the second solid. Washing equipment (230) is used to wash a second solid and output potassium chloride solid and wash water; Purification equipment (310) is used to remove impurities from the second clear liquid and the washing water and output purified liquid; A lithium precipitation reactor (320) is used to convert lithium ions in the purification liquid into lithium carbonate for precipitation, thereby obtaining a third solid-liquid mixture; The third solid-liquid separation device (330) is used to perform solid-liquid separation treatment on the third solid-liquid mixture and output a third clear liquid and lithium carbonate solid; The third clear liquid outlet of the third solid-liquid separation device (330) is connected to the solvent inlet of the leaching tank (120).
2. The lithium mica handling system of claim 1, wherein: The crystallization device (210) is a vacuum crystallizer.
3. The lithium mica processing system as described in claim 1, characterized in that: It also includes a drying device (240) for drying potassium chloride solids.
4. The lithium mica processing system as described in claim 3, characterized in that: The drying equipment (240) is any one of a rotary dryer, a fluidized bed dryer, and an airflow dryer.
5. The lithium mica processing system as described in claim 3, characterized in that: It also includes a granulation device (250) that granulates the dried potassium chloride solid to obtain potassium chloride product.
6. The lithium mica processing system as described in claim 5, characterized in that: The granulation equipment (250) includes a double-roller tablet press, a crusher, and a powder screener.
7. The lithium mica processing system as described in claim 1, characterized in that: It also includes a freshwater storage tank (140) connected to the solvent inlet of the leaching tank (120).
8. The lithium mica processing system as described in claim 1, characterized in that: The purification equipment (310) is at least one of an adsorption device, an extraction device, and a chemical precipitation device.
9. The lithium mica processing system as described in claim 1, characterized in that: It also includes a first intermediate tank (410) for storing the first clear liquid and the supernatant.
10. The lithium mica processing system as described in claim 1, characterized in that: It also includes a second intermediate tank (420) for storing the second clear liquid and wash water.