Lithium carbonate channelization continuous leaching reaction device and continuous reaction method

Abstract

The lithium carbonate channelization continuous leaching reaction device comprises a slurry tank, a solution tank and a discharging tank and further comprises a discharging pipeline, a first feeding pipeline and a second feeding pipeline, and the first feeding pipeline and the second feeding pipeline are arranged in parallel. The leaching reaction device further comprises a plurality of slurry heat exchangers, a plurality of solution heat exchangers and a plurality of leaching reactors connected in sequence, pipe passes of all the slurry heat exchangers are sequentially connected to the first feeding pipeline in series, and shell passes of all the solution heat exchangers and shell passes of all the slurry heat exchangers are connected to the second feeding pipeline in a crossed and series mode. The first feeding pipeline and the second feeding pipeline are connected with the first leaching reactor, the leaching reaction device further comprises a heating device connected with the first leaching reactor, and pipe paths of all the solution heat exchangers are sequentially connected to the discharging pipeline in series. The problems that in the prior art, in the leaching process of the lithium-containing slurry, scabbing of a heat exchange surface is serious, and solid materials of a shell layer of a heat exchange pipeline are deposited and cannot be cleaned in the waste heat utilization process of the leached slurry are solved.

Description

Technical Field

[0001] The invention relates to the field of metallurgy and chemical industry, and in particular to a pipelined continuous leaching reaction device and a continuous reaction method for lithium carbonate. Background Art

[0002] In recent years, with the increasing demand for lithium in industries such as lithium batteries, grease, and tire rubber, as well as the growing demand for lithium and its alloys in high-tech fields such as aerospace, aviation, and nuclear energy, the output of metallic lithium has also continued to grow. In 2016, China established lithium as one of the 24 national strategic mineral resources, which has important strategic significance for the national economy and national defense and military construction. Lithium carbonate is the basic material for the production of secondary lithium salts and metallic lithium, and is the most basic and important product in the lithium industry. Lithium carbonate is widely used in many fields such as electronic materials, chemistry, medicine, industrial ceramics, and metallurgy. With the rapid development of high-tech industries such as information technology, electric vehicles, and green energy, the market demand for lithium and its compounds has increased dramatically, and its demand has been in short supply, and the price remains high.

[0003] my country is rich in lithium resources associated with bauxite, especially in the central region where the lithium content of bauxite is high, with Li2O greater than 0.1%. In the Bayer process of alumina production, about 80% of lithium enters the solution during the Bayer process. Alumina is the raw material for aluminum electrolysis. Long-term use of alumina with high lithium content will have a serious impact on the aluminum electrolysis process, such as lower electrolysis temperature, worsening furnace regularity, lower electrolysis production stability, lower current efficiency, and increased energy consumption. The Li2O in the products of alumina plants in central my country is generally high. If the Li2O content of alumina is estimated at 0.1%, and the alumina output is estimated at 12 million tons / year, the amount of Li2CO3 taken away by metallurgical-grade alumina is as high as 63,428 tons per year, resulting in a huge waste of resources. Therefore, the efficient recycling of lithium resources in the alumina production process will not only help improve the quality of alumina products and eliminate the adverse effects on downstream aluminum electrolysis, but also open up new ways for the economic and efficient utilization of low-grade lithium-rich bauxite, which is also of great significance to the strategic security of my country's lithium resources. Patents CN 115124052 A A method for preparing battery-grade lithium carbonate and CN 107500318 A A method for extracting lithium carbonate from sodium aluminate solution in an alumina plant disclose methods for extracting lithium carbonate from the alumina production process. The lithium in the alumina production process is first adsorbed on aluminum hydroxide solid to form lithium-rich aluminum hydroxide, and then the lithium is leached out using a high-temperature wet leaching process to provide raw materials for subsequent liquid-solid separation, impurity removal, concentration, lithium precipitation and other processes. Since this technology is in the early stages of industrialization, there is no mature equipment for leaching lithium-rich aluminum hydroxide.

[0004] The spodumene soda pressure cooking process is a method for preparing lithium carbonate from spodumene proposed in the 1960s. It mainly involves reacting β-spodumene with a sodium carbonate solution at a relatively high temperature and pressure. The lithium in the spodumene is replaced by the sodium ions in the solution and precipitated in the form of lithium carbonate. The insoluble lithium carbonate generated by the pressure cooking reaction is converted into lithium bicarbonate through a carbonization reaction, which is dissolved in water and separated from the reaction residue (sodalite). Finally, the lithium bicarbonate is converted into lithium carbonate by heating and precipitated. The soda pressure cooking process has a short production process, a small material flow rate during the production process, high product purity, and low corrosion to equipment during the process. However, so far, there has been no report on the application of this technology in industrial practice, nor a mature set of processes and equipment for soda pressure cooking and leaching lithium carbonate.

[0005] The main purpose of the leaching process of lithium-rich aluminum hydroxide leaching lithium carbonate and spodumene soda pressure cooking leaching lithium carbonate is to leach lithium from the slurry solids to form a lithium-containing solution to provide raw materials for subsequent liquid-solid separation, impurity removal, concentration, lithium precipitation and other processes. The traditional leaching device is mainly similar to the pipeline dissolution device in the alumina industry. The lithium-containing raw ore slurry is preheated by a multi-stage exhaust steam preheater. After the steam is indirectly heated to the leaching temperature, it enters the leaching reactor for heat preservation and leaching. The slurry after leaching lithium carbonate is subjected to multi-stage flash evaporation for cooling and then enters the discharge tank. The exhaust steam generated by flash evaporation is used to preheat the raw ore slurry.

[0006] The existing problems are: the solubility of lithium carbonate is low. The lithium carbonate solution is a mixture of lithium-containing ore and a batching solution. The batching solution is usually water or alkali solution. The alkali solution can be a sodium carbonate solution, and its solubility decreases with increasing temperature. During the heating and preheating of the slurry, lithium carbonate is prone to form scars on the heat exchange surface; the solution phase of the leaching slurry is a saturated solution of lithium carbonate. During the flash evaporation process, the concentration of the leachate will gradually increase. Lithium carbonate will precipitate due to supersaturation, causing crystallization and blockage of the flash evaporator discharge pipe, affecting the normal operation of the system device; the original ore slurry and the leaching slurry containing solids are prone to form scars and siltation on the inner tube and shell of the shell and tube heat exchanger. The inner tube can be removed by hydraulic cleaning, but the scars and siltation formed between the shells are difficult to clean. Summary of the invention

[0007] The purpose of the present invention is to provide a lithium carbonate pipeline continuous leaching reaction device to solve the technical problems in the prior art that the heat exchange surface of lithium-containing slurry is severely scarred during the leaching of lithium carbonate, lithium carbonate is saturated and precipitated during the waste heat utilization of the leached slurry, and solid materials in the shell of the heat exchange pipe are accumulated and cannot be cleaned; the purpose of the present invention is also to provide a continuous reaction method using the lithium carbonate pipeline continuous leaching reaction device.

[0008] In order to solve the above technical problems, the technical solution of a pipelined continuous leaching reaction device of lithium carbonate in the present invention is as follows: A lithium carbonate pipeline continuous leaching reaction device, comprising a slurry tank for holding lithium-containing slurry, a solution tank for holding a slurry solution and a discharge tank, the leaching reaction device also comprises a discharge pipeline and a first feed pipeline and a second feed pipeline arranged in parallel, the first feed pipeline is connected to the slurry tank, the second feed pipeline is connected to the solution tank, the leaching reaction device also comprises a plurality of slurry heat exchangers, a plurality of solution heat exchangers and a plurality of leaching reactors connected in sequence, each slurry heat exchanger is defined as a first slurry heat exchanger, a second slurry heat exchanger... an Nth slurry heat exchanger, each solution heat exchanger is defined as a first solution heat exchanger, a second solution heat exchanger... an Mth solution heat exchanger, the slurry heat exchanger and the solution heat exchanger are both shell-and-tube heat exchangers, each The leaching reactors are respectively the first leaching reactor, the second leaching reactor...the Lth leaching reactor, N, M, and L are positive integers not less than 3, the tubes of the first slurry heat exchanger, the second slurry heat exchanger...the Nth slurry heat exchanger are serially connected to the first feed pipeline, the shells of each solution heat exchanger and each slurry heat exchanger are cross-connected in series to the second feed pipeline, the discharge ends of the first feed pipeline and the second feed pipeline are connected to the first leaching reactor, the leaching reaction device also includes a heating device connected to the first leaching reactor, the discharge pipeline is connected between the Lth leaching reactor and the discharge trough, the tubes of the Mth solution heat exchanger, the M-1th solution heat exchanger...the first solution heat exchanger are serially connected to the discharge pipeline.

[0009] Furthermore, the heating device comprises a steam inlet pipe connected to the first leaching reactor.

[0010] Furthermore, a slurry delivery pump is provided on the first feed pipeline, and a solution delivery pump is provided on the second feed pipeline.

[0011] Furthermore, the feed inlet of the first leaching reactor is connected to a feed pipeline connected to the first feed pipeline and the second feed pipeline.

[0012] The technical scheme of the continuous reaction method in the present invention is: A continuous reaction method using the lithium carbonate pipeline continuous leaching reaction device, wherein the slurry tank is filled with raw ore slurry containing solids prepared by mixing lithium ore and a first batching solution, and the batching tank is filled with a second batching solution without solids, the raw ore slurry flows through the first slurry heat exchanger, the second slurry heat exchanger...the tube side of the Nth slurry heat exchanger in sequence, the second batching solution cross-flows through the solution heat exchanger and the shell side of the corresponding slurry heat exchanger, the second batching solution and the raw ore slurry are mixed to form a mixed slurry before entering the first leaching heater, the mixed slurry flows through the first leaching reactor, the second leaching reactor...the Lth leaching reactor in sequence, the mixed slurry is heated by a heating device when flowing through the corresponding leaching reactor, and the leached slurry flowing out of the Lth leaching reactor flows through the tube side of the Mth solution heat exchanger, the M-1th solution heat exchanger...the first solution heat exchanger in sequence, and then flows to the discharge tank.

[0013] Furthermore, the first batching solution and the second batching solution are water or alkaline or acidic solutions.

[0014] Furthermore, the volume flow rate of the second batching solution is 0.5 to 5 times the volume flow rate of the original ore slurry.

[0015] Furthermore, the temperature of the mixed slurry before entering the first leaching reactor is 150°C to 200°C.

[0016] Furthermore, the temperature in the leaching reactor is 180°C to 280°C.

[0017] The beneficial effects of the present invention are as follows: when in use, the slurry tank is filled with raw ore slurry consisting of lithium ore and a batching solution, and the solution tank is filled with a batching solution without a lithium ore solid phase, that is, the raw ore slurry containing a solid phase is transported to the first leaching reactor through the first feed pipeline, and the batching solution without a solid phase is transported to the first leaching reactor through the second feed pipeline, and the leaching slurry produced by each level of leaching reactor flows back to the discharge tank through the discharge pipeline. The lithium concentrate leaching process needs to heat the lithium concentrate to promote lithium leaching, and the leached slurry is heated to promote lithium leaching. The slurry temperature is relatively high, and the leached slurry flows through the tube side of the Mth solution heat exchanger, the N-1th solution heat exchanger...the first solution heat exchanger in sequence. Therefore, the solid-free batch solution flowing through the shell side of the solution heat exchanger can be heated, and the heated solid-free batch solution flows through the shell side of the slurry heat exchanger again, thereby heating the original ore slurry flowing through the tube side of the slurry heat exchanger, thereby increasing the temperature of the original ore slurry entering the leaching reactor, realizing the recovery of waste heat from the leached slurry, and reducing the energy consumption of the heating device.

[0018] In the present invention, the raw ore slurry containing solid phase and the leached slurry containing solid phase flow in the tube side (inner tube) of the shell-and-tube heat exchanger, and the formed scabs and sludge can be removed by hydraulic cleaning. The material flowing in the shell side of the shell-and-tube heat exchanger is always the second batching solution without solids, which will not form scabs on the heat exchange surface and will not cause siltation, thereby avoiding the technical problem that the shell layer of the heat exchanger cannot be cleaned.

[0019] The important innovations of the present invention are: 1. Improvement of batching method: In the prior art, lithium-containing ore and batching solution are prepared once according to the leaching formula requirements. The present invention adopts lithium ore and batching solution to be prepared twice according to the leaching formula: the batching solution is divided into two parts, one part of the batching solution is the first batching solution, the first batching solution is mixed with the lithium-containing ore in advance to form the raw ore slurry, and the other part of the batching solution is the second batching solution, the raw ore slurry and the second batching solution are preheated respectively, and mixed before entering the leaching heater, and the ratio of lithium ore and solution in the mixed slurry meets the formula requirements.

[0020] 2. The preheating method is improved. The second batching solution is used to flow through the shell side of the solution heat exchanger and the slurry heat exchanger to realize the recovery of the waste heat of the leaching slurry and transfer the waste heat to the original ore slurry containing the solid phase. It not only realizes the full recovery of the waste heat of the leaching slurry, but also does not contain a solid phase, thus not causing scarring and siltation of the heat exchanger shell. Before entering the leaching reactor, the second batching solution is mixed with the original ore slurry to form a pre-leaching slurry that meets the requirements of the leaching formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of an embodiment of a pipelined continuous leaching reaction device for lithium carbonate in the present invention; 1. Slurry tank; 2. Solution tank; 3. Discharge tank; 4. Slurry pump; 5. Solution pump; 6. First feed pipeline; 7. Second feed pipeline; 8. First slurry heat exchanger; 9. Second slurry heat exchanger; 10. Third slurry heat exchanger; 11. Fourth slurry heat exchanger; 12. First solution heat exchanger; 13. Second solution heat exchanger; 14. Third solution heat exchanger; 15. Fourth solution heat exchanger; 16. Fifth solution heat exchanger; 17. Discharge pipeline; 18. First check valve; 19. Second check valve; 20. Mixer; 21. Feed pipeline; 22. First leaching reactor; 23. Second leaching reactor; 24. Third leaching reactor; 25. Steam inlet pipe. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0023] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] An embodiment of a lithium carbonate pipeline continuous leaching reaction device of the present invention is as follows: Figure 1 As shown: The invention comprises a slurry tank 1, a solution tank 2 and a discharging tank 3. The slurry tank 1, the solution tank 2 and the discharging tank 3 are all provided with stirring devices. The slurry tank is used to hold a batching solution and a lithium-containing ore slurry, that is, the slurry tank holds a lithium-containing batching solution also called raw ore slurry, that is, raw ore slurry containing solids; the solution tank is used to hold a batching solution, that is, the solution tank holds a batching solution without lithium; and the discharging tank is used for the precipitation of lithium carbonate crystals. The batching solution is water or sodium carbonate lye.

[0025] The leaching reaction device also includes a discharge pipeline and a first feed pipeline 6 and a second feed pipeline 7 arranged in parallel. The leaching reaction device also includes a plurality of leaching reactors connected in sequence. In this embodiment, there are three leaching reactors, and the number of leaching reactors is recorded as L. Along the direction of the material, the three leaching reactors are respectively the first leaching reactor 22, the second leaching reactor 23 and the third leaching reactor 24. Each leaching reactor is provided with a stirring device, wherein the third leaching reactor is connected to the discharge trough 3 through the discharge pipeline 17. A slurry delivery pump 4 is provided on the first feed pipeline, and a solution delivery pump 5 is provided on the second feed pipeline.

[0026] The tail end of the first feed pipeline 6 is provided with a first check valve 18, the tail end of the second feed pipeline 7 is provided with a second check valve 19, and the feed port of the first leaching reactor is connected to a feed pipeline 21 connected to the first feed pipeline and the second feed pipeline through a mixer 20. The leaching reaction device also includes a heating device connected to the first leaching reactor. In this embodiment, the heating device includes a steam inlet pipe 25 connected to the first leaching reactor. When in use, high-temperature and high-pressure steam is introduced into the first leaching reactor through the steam inlet pipe to achieve direct heating of the material in the first leaching reactor. In other embodiments of the present invention, the heating device can also be a heat exchanger that uses heat transfer oil, molten salt, or hot steam for indirect heating.

[0027] The leaching reaction device also includes N slurry heat exchangers and M solution heat exchangers, where N and M are both positive integers not less than 3. In the present embodiment, N is four and M is five. The slurry heat exchangers are defined as the first slurry heat exchanger 8, the second slurry heat exchanger 9, the third slurry heat exchanger 10 and the fourth slurry heat exchanger 11, and the solution heat exchangers are defined as the first solution heat exchanger 12, the second solution heat exchanger 13, the third solution heat exchanger 14, the fourth solution heat exchanger 15 and the fifth solution heat exchanger 16. Each slurry heat exchanger and each solution heat exchanger are tubular heat exchangers, which belong to the prior art. The specific structure will not be described in detail here. The tubular heat exchanger includes a tube side and a shell side arranged outside the tube side. When in use, the two fluids to be heat exchanged flow through the tube side and the shell side respectively.

[0028] In this embodiment, the tube side of the first slurry heat exchanger, the tube side of the second slurry heat exchanger, the tube side of the third slurry heat exchanger and the tube side of the fourth slurry heat exchanger are connected in series in sequence on the first feed pipeline. Each solution heat exchanger and the shell side of each slurry heat exchanger are cross-connected in series on the second feed pipeline, that is, the batching solution in the solution tank flows through the shell side of the first solution heat exchanger, the shell side of the first slurry heat exchanger, the shell side of the second solution heat exchanger, the shell side of the second slurry heat exchanger, the shell side of the third solution heat exchanger, the shell side of the third slurry heat exchanger, the shell side of the fourth solution heat exchanger, the shell side of the fourth slurry heat exchanger and the shell side of the fifth solution heat exchanger in sequence, and then flows to the feed pipeline through the second check valve.

[0029] The tube passes of the fifth solution heat exchanger, the fourth solution heat exchanger, the third solution heat exchanger, the second solution heat exchanger and the first solution heat exchanger are connected in series on the discharge pipeline in sequence along the direction of the material in the discharge pipeline.

[0030] The discharge flow rate of the first feed pipeline is 1 to 5 times the discharge flow rate of the second feed pipeline; the flow velocity of the first feed pipeline is 0.5 to 3 m / s; and the temperature in the leaching reactor is 150 to 300°C.

[0031] In other embodiments of the present invention, the number of solution heat exchangers can also be selected according to needs, such as three, four or other numbers; the number of slurry heat exchangers can also be selected according to needs, such as three, five or other numbers; the number of leaching reactors can also be selected according to needs, such as four, five or other numbers.

[0032] The use process of the present invention is that the lithium-containing batching solution flows through the first feed pipeline, sequentially through the tube side of the first slurry heat exchanger, the second slurry heat exchanger, the third slurry heat exchanger and the fourth slurry heat exchanger, and then flows to the first leaching reactor through the feed pipeline; the batching solution not containing the solid phase of lithium ore flows through the second feed pipeline, sequentially through the shell side of the first solution heat exchanger, the shell side of the first slurry heat exchanger, the shell side of the second solution heat exchanger, the shell side of the second slurry heat exchanger, the shell side of the third solution heat exchanger, the shell side of the third slurry heat exchanger, the shell side of the fourth solution heat exchanger, the shell side of the fourth slurry heat exchanger and the shell side of the fifth solution heat exchanger, and then flows to the first leaching reactor through the feed pipeline. Steam heats the material in the first leaching reactor, and the material reacts in the first leaching reactor, the second leaching reactor and the third leaching reactor to generate a leaching slurry consisting of a lithium-containing solution and solid-phase leaching residue, which then flows through the fifth solution heat exchanger, the fourth solution heat exchanger, the third solution heat exchanger, the second solution heat exchanger and the first solution heat exchanger in sequence through the discharge pipeline, and finally flows back to the discharge tank.

[0033] The solid-free batching solution in the second feed pipeline exchanges heat with the leaching slurry in each solution heat exchanger tube. After the lithium-free batching solution is heated, it flows through the shell side of the slurry heat exchanger and exchanges heat with the lithium-containing ore slurry in the slurry heat exchanger tube. The lithium-containing ore slurry in the first feed pipeline is heated, and finally the solutions in the first feed pipeline and the second batching pipeline will flow together to the first leaching reactor, thereby realizing the recovery of waste heat from the leaching reactor and the heating of the reaction solution.

[0034] The present invention also has the following technical effects: 1. The lithium carbonate slurry flows through the tube side (i.e., inner tube) of the tubular heat exchanger, and its scars are easy to clean mechanically. The shell side of the tubular heat exchanger does not contain lithium solution, and there is no problem of solid particle accumulation that is difficult to clean.

[0035] 2. The leaching slurry is heated directly through the steam heating process, without heat exchange surface, and there is no problem of heat exchange surface scarring.

[0036] 3. The leaching device does not contain a slurry flash evaporation system, which avoids the problem of scarring of the flash evaporator and the flash evaporator discharge pipe caused by the precipitation of lithium carbonate crystals due to the increase in lithium carbonate concentration during the flash evaporation process.

[0037] 4. Continuous leaching of lithium carbonate can be achieved, and the waste heat of the leached slurry can be fully recovered and utilized.

[0038] An implementation example of a continuous reaction method using a lithium carbonate pipeline continuous leaching reaction device Figure 1 As shown: The lithium carbonate pipeline continuous leaching reaction device in this embodiment has the same structure as the lithium carbonate pipeline continuous leaching reaction device described above, and will not be described in detail here.

[0039] Continuous reaction method, the slurry tank is filled with a solid-containing raw ore slurry prepared by mixing lithium ore and a first batching solution, the batching tank is filled with a second batching solution without solids, the raw ore slurry flows through the first slurry heat exchanger, the second slurry heat exchanger...the tube side of the Nth slurry heat exchanger in sequence, the second batching solution cross-flows through the solution heat exchanger and the shell side of the corresponding slurry heat exchanger, the second batching solution and the raw ore slurry are mixed to form a mixed slurry before entering the first leaching heater, the mixed slurry flows through the first leaching reactor, the second leaching reactor...the Lth leaching reactor in sequence, the mixed slurry is heated by a heating device when flowing through the corresponding leaching reactor, and the leached slurry flowing out of the Lth leaching reactor flows through the tube side of the Mth solution heat exchanger, the M-1th solution heat exchanger...the first solution heat exchanger in sequence and then flows to the discharge tank. Raw ore slurry refers to lithium ore slurry containing solid matter. The raw ore slurry is a slurry formed by mixing and grinding the first batching solution and lithium ore, and the raw ore slurry contains solid particles; the leaching slurry is a slurry composed of leaching liquid and leaching residue after the leaching reaction.

[0040] Preferably, the first batching solution and the second batching solution are water or alkaline or acidic solutions.

[0041] Preferably, the volume flow rate of the second batching solution is 0.5 to 5 times the volume flow rate of the original ore slurry.

[0042] Preferably, the temperature of the mixed slurry before entering the first leaching reactor is 150°C to 200°C.

[0043] Preferably, the temperature in the leaching reactor is 180°C to 280°C.

[0044] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0045] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0046] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipelined continuous leaching reaction device for lithium carbonate, characterized in that: The invention comprises a slurry tank for holding raw ore slurry containing lithium ore, a solution tank for holding a loading solution and a discharge tank, the leaching reaction device also comprises a discharge pipeline and a first feed pipeline and a second feed pipeline arranged in parallel, the first feed pipeline is connected to the slurry tank, the second feed pipeline is connected to the solution tank, the leaching reaction device also comprises a plurality of slurry heat exchangers, a plurality of solution heat exchangers and a plurality of leaching reactors connected in sequence, and each slurry heat exchanger is defined as a first slurry heat exchanger, a second slurry heat exchanger ... an Nth slurry heat exchanger, each solution heat exchanger is respectively a first solution heat exchanger, a second solution heat exchanger ... an Mth solution heat exchanger, the slurry heat exchanger and the solution heat exchanger are both shell-and-tube heat exchangers, and each leaching reactor is divided into They are respectively the first leaching reactor, the second leaching reactor...the Lth leaching reactor, N, M, and L are positive integers not less than 3, the tubes of the first slurry heat exchanger, the second slurry heat exchanger...the Nth slurry heat exchanger are serially connected on the first feed pipeline, the shells of each solution heat exchanger and each slurry heat exchanger are cross-connected in series on the second feed pipeline, the discharge ends of the first feed pipeline and the second feed pipeline are connected to the first leaching reactor, the leaching reaction device also includes a heating device connected to the first leaching reactor, the discharge pipeline is connected between the Lth leaching reactor and the discharge trough, the tubes of the Mth solution heat exchanger, the M-1th solution heat exchanger...the first solution heat exchanger are serially connected on the discharge pipeline.

2. The lithium carbonate pipeline continuous leaching reaction device according to claim 1, characterized in that: The heating device comprises a steam inlet pipe connected to the first leaching reactor.

3. The lithium carbonate pipeline continuous leaching reaction device according to any one of claims 1 to 3, characterized in that: The feed inlet of the first leaching reactor is connected with a feed pipeline connected to the first feed pipeline and the second feed pipeline.

4. A continuous reaction method using the lithium carbonate pipeline continuous leaching reaction device according to any one of claims 1 to 4, characterized in that: The slurry tank contains raw ore slurry prepared by mixing lithium ore and a first batching solution, and the batching tank contains a second batching solution that does not contain solids. The raw ore slurry flows through the first slurry heat exchanger, the second slurry heat exchanger...the tube side of the Nth slurry heat exchanger in sequence, the second batching solution cross-flows through the solution heat exchanger and the shell side of the corresponding slurry heat exchanger, the second batching solution and the raw ore slurry are mixed to form a mixed slurry before entering the first leaching heater, the mixed slurry flows through the first leaching reactor, the second leaching reactor...the Lth leaching reactor in sequence, the mixed slurry is heated by a heating device when flowing through the corresponding leaching reactor, and the leached slurry flowing out of the Lth leaching reactor flows through the Mth solution heat exchanger, the M-1th solution heat exchanger...the tube side of the first solution heat exchanger in sequence and then flows to the discharge tank.

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