CN115069022A

CN115069022A - Coprecipitation reaction system

Info

Publication number: CN115069022A
Application number: CN202210735495.7A
Authority: CN
Inventors: 何志; 赵聪; 何劲松; 康彬; 杨光耀
Original assignee: Sichuan Sidaneng Environmental Protection Technology Co ltd; Chengdu Stareng Environmental Protection Equipment Co ltd
Current assignee: Sichuan Sidaneng Environmental Protection Technology Co ltd; Chengdu Stareng Environmental Protection Equipment Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-09-20

Abstract

The invention discloses a coprecipitation reaction system, which aims to solve the technical problem that the reaction is influenced due to the large volume of a filtering concentrator. The coprecipitation reaction system comprises: a coprecipitation reaction unit and a filtration concentration unit comprising a filtration concentrator in which, if a plane perpendicular to a central axis of a housing of the filtration concentrator and intersecting a filtration plane of a filter element is taken as a cross section: in the cross section, the clear liquid cavities are distributed in the form of a first graph, the first graph is a closed graph, the closed graph is circular or polygonal, the area, except the first graph, in the cross section, of the outer shell of the filter concentrator basically consists of a second graph and a third graph, the raw liquid cavities are distributed in the form of the second graph, the filter materials of the filter element are distributed in the form of the third graph, and the first graph is distributed in an array mode in the cross section.

Description

Coprecipitation reaction system

Technical Field

The embodiments of the present application relate to co-precipitation reaction systems. The coprecipitation reaction system is suitable for preparing the precursor of the anode material of the lithium ion secondary battery, and is particularly suitable for preparing the ternary precursor.

Background

The chemical coprecipitation method is widely applied to liquid-phase chemical synthesis of powder materials, and generally, a proper precipitator is added into a raw material solution, so that all components which are uniformly mixed in the solution are precipitated together according to a stoichiometric ratio, or an intermediate product is precipitated in the solution through reaction, and then is calcined and decomposed to prepare a target product. The process can regulate and control the granularity and the morphology of the product according to experimental conditions, and the effective components in the product can be uniformly mixed at the atomic and molecular level.

At present, the preparation of the ternary precursor of the lithium ion secondary battery anode material is an important application of a chemical coprecipitation method in new energy industry. The preparation method comprises the steps of preparing nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride) and manganese sulfate (or manganese chloride) into a mixed salt solution with a certain molar concentration, preparing sodium hydroxide into an alkali solution with a certain molar concentration, using ammonia water with a certain concentration as a complexing agent, adding the mixed salt solution, the alkali solution and the complexing agent into a reaction kettle at a certain flow rate, controlling the stirring rate of the reaction kettle, the temperature and the pH value of reaction slurry, the reaction atmosphere (currently, the reaction process is generally required to be completed under the protection of nitrogen), and the like, performing neutralization reaction on salt and alkali to generate a ternary precursor crystal nucleus, gradually growing the ternary precursor crystal nucleus, and filtering, washing and drying a reaction product to obtain a ternary precursor after the particle size reaches a preset value. Therefore, the reaction process has more technological parameters to be controlled, and mainly comprises the following steps: salt and intermediate concentration, ammonia water concentration, the rate of adding the salt solution and the alkali solution into the reaction kettle, reaction temperature, pH value during the reaction process, stirring rate, reaction time, solid content of reaction slurry, reaction atmosphere and the like. And after the preparation of the ternary precursor is finished, uniformly mixing the ternary precursor and a lithium source according to a certain proportion, then calcining, and crushing, grading and drying the cooled material to obtain the lithium ion secondary battery anode material.

In order to facilitate production, a filtering concentrator is arranged beside a reaction kettle at present to implement 'out-kettle concentration'. In the operation process of the reaction kettle, reaction raw materials (salt solution, alkali solution and ammonia water) are added into the reaction kettle, part of reaction slurry in the reaction kettle enters a filtering concentrator, a filter element is installed in the filtering concentrator and is provided with a stirring structure, clear liquid can be output from the filtering concentrator after the reaction slurry is filtered by the filter element, the clear liquid can be reused for reaction as mother liquid, and concentrated liquid in the filtering concentrator returns to the reaction kettle through a concentrated slurry backflow structure. The stirring structure in the filtration concentrator is generally including being arranged in the main shaft in the filtration concentrator and installing the epaxial stirring rake in the stirring, and the main shaft is driven by the outside motor of filtration concentrator, and filter core interval arrangement can stir thick liquids when the stirring rake is rotatory, prevents that the particulate matter in the thick liquids from subsiding and prolong filter cake formation time on the filter core. However, the internal structure design of the filtering concentrator leads to larger volume of the filtering concentrator, so that the reaction slurry stays in the filtering concentrator outside the reaction kettle for a longer time, the reaction process is influenced by various process parameters, and once the environment changes, the reaction is influenced, so that the consistency of the reaction and the granularity of the ternary precursor is influenced when the slurry stays in the filtering concentrator for a longer time.

Aiming at the problems brought by the independent arrangement of the filtering concentrator, one solution is to cancel the filtering concentrator and directly install the filter element in a reaction kettle, and at this time, the reaction kettle can be called as co-precipitation reaction and filtering concentration integrated equipment. Because the reaction and the filtration concentration are carried out in the coprecipitation reaction and filtration concentration integrated equipment, the reaction slurry is always in the same environment, and the influence of the independent deployment of the filtration concentrator on the reaction is avoided. However, it is noted that: the coprecipitation reaction and filtration concentration integrated equipment has higher requirement on the material damage prevention stability of the filter element. If the filter element is damaged, the reaction slurry is contaminated by the material falling off from the filter element.

On the other hand, no matter a coprecipitation reaction system with a separately deployed filter concentrator or a coprecipitation reaction system with a coprecipitation reaction and filter concentration integrated device is adopted, clear liquid filtered by the filter element needs to be output through a clear liquid outlet system. At present, a cleaning system mainly comprises a plurality of parts such as pipelines, valves, backflushing devices and the like, the parts are temporarily installed on site along with the field installation of a filter concentrator or a coprecipitation reaction and filter concentration integrated device, the construction strength is high, the time is long, and the project construction progress is influenced.

Disclosure of Invention

The embodiment of the application provides a coprecipitation reaction system and a filtering and concentrating device for the same to solve the technical problem that the reaction is influenced by the fact that the volume of a filtering and concentrating device is large.

According to one aspect of the present application, a coprecipitation reaction system is provided. The method comprises the following steps: the device comprises a coprecipitation reaction unit, a stirring unit and a control unit, wherein the coprecipitation reaction unit comprises a reaction kettle, the reaction kettle is provided with a shell and an inner cavity, a raw material feeding structure, a slurry discharging structure to be concentrated and a concentrated slurry backflow structure are respectively arranged on the shell of the reaction kettle, the raw material feeding structure, the slurry discharging structure to be concentrated and the concentrated slurry backflow structure are respectively communicated with the inner cavity of the reaction kettle, and a stirring structure is arranged in the inner cavity of the reaction kettle; the filtering and concentrating unit comprises a filtering concentrator, the filtering concentrator is provided with a shell and a filter element, the filter element forms a stock solution cavity and a clear solution cavity in the shell of the filtering concentrator, a slurry to be concentrated feeding structure, a concentrated slurry discharging structure and a clear solution discharging structure are respectively arranged on the shell of the filtering concentrator, the slurry to be concentrated feeding structure and the concentrated slurry discharging structure are respectively communicated with the stock solution cavity, and the clear solution discharging structure is communicated with the clear solution cavity; the slurry discharging structure to be concentrated is used for being connected with the slurry feeding structure to be concentrated, the concentrated slurry discharging structure is used for being connected with the concentrated slurry backflow structure, the raw material feeding structure is used for being connected with co-precipitation reaction raw material supply equipment, and the clear liquid discharging structure is used for being connected with a clear liquid discharging system; in the filter concentrator, the filter element is provided with a first edge and a second edge which are perpendicular to each other, the area of a filter surface of the filter element is basically determined by the product of the length of the first edge and the length of the second edge, the direction of the length of the first edge is consistent with the direction of a central axis of a shell of the filter concentrator and is vertically arranged, and the slurry feeding structure to be concentrated and the concentrated slurry discharging structure are both arranged at the lower end of the shell of the filter concentrator; if a plane which is perpendicular to the central axis and intersects with the filtering surface of the filter element is taken as a cross section, then: the clear liquid chambers are distributed in the form of a first pattern on the cross section, the first pattern is a closed pattern, the closed pattern is circular or polygonal in shape, the area of the cross section, which is located in the housing of the filter concentrator and is exclusive of the first pattern, is substantially composed of a second pattern and a third pattern, the raw liquid chambers are distributed in the form of the second pattern, the filter material of the filter element is distributed in the form of the third pattern, and the first pattern is distributed in an array on the cross section.

Optionally, the housing of the filtration concentrator is provided with a vertical cylinder, and the vertical cylinder is divided into an upper cylinder, a middle cylinder and a lower cylinder which are sequentially communicated from top to bottom; the upper barrel is provided with the clear liquid discharging structure, the clear liquid discharging structure is respectively connected with the upper end ports of the filter elements through clear liquid discharging pipes arranged in the upper barrel, and the slurry discharging structure to be concentrated is connected with the slurry feeding structure to be concentrated through a feeding pump; a filter element mounting structure is arranged in the middle barrel, and the filter element is mounted in the middle barrel through the filter element mounting structure; the lower barrel is provided with the slurry feeding structure to be concentrated, the concentrated slurry discharging structure and a hydraulic stirring backflow structure respectively, the slurry feeding structure to be concentrated is connected with the slurry discharging structure to be concentrated through a feeding pump, the concentrated slurry discharging structure is connected with the hydraulic stirring backflow structure through a hydraulic stirring pump to form a hydraulic stirring circulation loop, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure through a concentrated slurry backflow branch.

Optionally, the concentrated slurry backflow branch is further connected with a pipeline between the feed end connected with the feed pump and the slurry discharging structure to be concentrated through a diversion bypass, and a flow path where the feed pump is located and a flow path where the hydraulic stirring pump is located are connected in series through the diversion bypass to form a circulation loop.

Optionally, the housing of the filtration concentrator is provided with a vertical cylinder, and the vertical cylinder is divided into an upper cylinder, a middle cylinder and a lower cylinder which are sequentially communicated from top to bottom; the upper barrel is provided with the clear liquid discharging structure, the clear liquid discharging structure is respectively connected with the upper end ports of the filter elements through clear liquid discharging pipes arranged in the upper barrel, and the slurry discharging structure to be concentrated is connected with the slurry feeding structure to be concentrated through a feeding pump; a filter element mounting structure is arranged in the middle barrel, and the filter element is mounted in the middle barrel through the filter element mounting structure; the lower barrel is provided with the slurry feeding structure to be concentrated and the concentrated slurry discharging structure respectively, the slurry feeding structure to be concentrated and the concentrated slurry discharging structure are connected through a feeding pump which is also used as a hydraulic stirring pump to form a hydraulic stirring circulation loop, the hydraulic stirring circulation loop is connected with the slurry discharging structure to be concentrated through a slurry feeding branch to be concentrated, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure through a concentrated slurry backflow branch.

Optionally, the lower part barrel still contains bottom toper structure, the diameter of bottom toper structure from top to bottom reduces gradually, the lower extreme of bottom toper structure is equipped with wait to concentrate thick liquids feeding structure.

Optionally, when the coprecipitation reaction system operates, the liquid level height in the upper barrel is controlled within a set range, so that the liquid level in the upper barrel is lower than the top of the upper barrel, and a cavity is formed; and an exhaust structure communicated with the cavity is arranged at the top of the upper cylinder. Optionally, the exhaust structure is connected with a vapor-liquid mixed phase input structure of the vapor-liquid separator.

Optionally, the outer edge of the second pattern forms a circular edge, and the first pattern is circular; the first patterns are arranged in the circular edge to form a plurality of horizontal and transverse spaced first pattern columns, each horizontal and transverse spaced first pattern column is composed of a plurality of first patterns spaced along the horizontal and transverse direction, and adjacent horizontal and transverse spaced first pattern columns are arranged along the horizontal and longitudinal direction at intervals; the first patterns in one horizontal transverse interval first pattern column are staggered with the first patterns in the other horizontal transverse interval first pattern column along the horizontal transverse direction; in the circular edge, the diameters of all the first patterns are consistent, the spacing between any two adjacent horizontally transversely spaced first patterns is consistent, and the spacing between any two adjacent horizontally transversely spaced first pattern columns is also consistent.

Optionally, the first patterns are arranged in the outer edge of the second pattern to form a plurality of horizontally and transversely spaced first pattern columns, each horizontally and transversely spaced first pattern column is composed of a plurality of horizontally and transversely spaced first patterns, and adjacent horizontally and transversely spaced first pattern columns are arranged at intervals along the horizontal longitudinal direction; the cleaning device comprises a cleaning pipe, a filter element and a cleaning device, wherein the cleaning pipe is divided into at least two cleaning pipe groups, each cleaning pipe group comprises at least two horizontal transverse pipes, each horizontal transverse pipe corresponds to one horizontal transverse interval first pattern row one by one and is respectively connected with the upper end opening of each filter element in the horizontal transverse interval first pattern row one by one through a branch pipe; the clear liquid discharging structure comprises discharging pipes which are in one-to-one correspondence with the at least two clear liquid discharging pipe groups, each discharging pipe is respectively connected with the output end of each horizontal pipe in the clear liquid discharging pipe group in one-to-one correspondence, and all filter elements corresponding to the discharging pipes for outputting clear liquid are used as a group of filter elements; the cleaning system performs backwashing regeneration on the filter elements of the same group at the same time according to the group of the filter elements, and performs backwashing regeneration on the filter elements of different groups at different time.

Optionally, the horizontal pipes of the at least two clear pipe groups are arranged in a staggered manner in the horizontal longitudinal direction; the number of the filter elements which are respectively connected with the at least two clear pipe groups is basically the same.

Optionally, the play clear system has all adopted a whole movable play clear module, whole movable play clear module specifically contains: the frame type support comprises a support base and a bridge frame arranged on the support base, wherein a pipeline facility installation area is formed on one side, located on the bridge frame, of the support base, and a functional container facility installation area is formed in the bridge frame; the system comprises a clear liquid conveying and filter element backwashing pipeline system, a pipeline facility installation area and a pipeline facility installation area, wherein the clear liquid conveying and filter element backwashing pipeline system is installed in the pipeline facility installation area and comprises clear liquid conveying pipes which correspond to the groups of the filter elements one to one and backwashing medium conveying pipes which correspond to the groups of the filter elements one to one, the output ends of the clear liquid conveying pipes are connected with a clear liquid conveying main pipe through one-to-one control valves, the input ends of the clear liquid conveying pipes are connected with a clear liquid input hydraulic stirring backflow structure which is used for being connected with a clear liquid discharging structure of the corresponding groups of the filter elements, the input ends of the backwashing medium conveying pipes are connected with a backwashing medium conveying main pipe through one-to-one control valves, and the output ends of the backwashing medium conveying pipes are connected with bypasses of the clear liquid conveying pipes which correspond to one; the functional container equipment set is erected on the bridge and located in the functional container type facility installation area, the functional container equipment set comprises a backflushing device, a backflushing medium input structure and a backflushing medium output structure are respectively arranged on a shell of the backflushing device, and the backflushing medium output structure is connected with the backflushing medium conveying main pipe.

Optionally, the pipeline sight glass is installed to the input of clear liquid conveyer pipe, be connected with on the pipeline sight glass be used for with the clear liquid input hydraulic stirring reflux structure that corresponds the clear liquid ejection of compact structural connection of the group of filter core.

Optionally, the functional container equipment set comprises a vapor-liquid separator, and a vapor-liquid mixed phase input structure, a separated liquid phase output structure and a separated gas phase output structure are respectively arranged on a shell of the vapor-liquid separator.

Optionally, a pump equipment mounting area is formed on the other side of the bridge frame on the supporting base; the integral movable clear module also comprises a pump, the pump is arranged in the pump equipment installation area, the pump comprises a clear pump, and the clear pump is connected into the clear liquid conveying main pipe to form a part of the clear liquid conveying main pipe.

Optionally, the recoil medium input structure of the recoil device comprises a recoil liquid input structure and a compressed gas input structure, a recoil liquid overflow port is further arranged on the shell of the recoil device, the recoil liquid overflow port is connected to the output port of the clear liquid conveying main pipe through a recoil liquid overflow pipe, the output port of the clear liquid conveying main pipe is integrally higher than the recoil liquid overflow port, and a rising section is arranged on the recoil liquid overflow pipe.

Optionally, the functional container equipment group includes the heat transfer cooler, be equipped with clear solution passageway and the coolant medium passageway that separates each other through the heat transfer wall in the heat transfer cooler, be equipped with on the shell of heat transfer cooler respectively with clear solution entry and clear solution export that the both ends of clear solution passageway are connected, still be equipped with on the shell of heat transfer cooler respectively with coolant medium entry and the coolant medium export that the both ends of coolant medium passageway are connected, clear solution entry with the clear solution export is established ties on the clear solution conveying main pipe so that the clear solution passageway constitutes a part of clear solution conveying main pipe.

According to another aspect of the present application, there is provided a filtration concentration apparatus for a coprecipitation reaction system. A filtering concentration device for a coprecipitation reaction system comprises a coprecipitation reaction unit, wherein the coprecipitation reaction unit comprises a reaction kettle, the reaction kettle is provided with a shell and an inner cavity, a raw material feeding structure, a slurry discharging structure to be concentrated and a concentrated slurry backflow structure are respectively arranged on the shell of the reaction kettle, the raw material feeding structure, the slurry discharging structure to be concentrated and the concentrated slurry backflow structure are respectively communicated with the inner cavity of the reaction kettle, and a stirring structure is arranged in the inner cavity of the reaction kettle; it includes: the filtering and concentrating unit comprises a filtering concentrator, the filtering concentrator is provided with a shell and a filter element, the filter element forms a stock solution cavity and a clear solution cavity in the shell of the filtering concentrator, a slurry to be concentrated feeding structure, a concentrated slurry discharging structure and a clear solution discharging structure are respectively arranged on the shell of the filtering concentrator, the slurry to be concentrated feeding structure and the concentrated slurry discharging structure are respectively communicated with the stock solution cavity, and the clear solution discharging structure is communicated with the clear solution cavity; the slurry feeding structure to be concentrated is used for being connected with the slurry discharging structure to be concentrated, the concentrated slurry discharging structure is used for being connected with the concentrated slurry backflow structure, and the clear liquid discharging structure is used for being connected with a clear liquid discharging system; in the filter concentrator, the filter element is provided with a first edge and a second edge which are perpendicular to each other, the area of a filter surface of the filter element is basically determined by the product of the length of the first edge and the length of the second edge, the direction of the length of the first edge is consistent with the direction of a central axis of a shell of the filter concentrator and is vertically arranged, and the slurry feeding structure to be concentrated and the concentrated slurry discharging structure are both arranged at the lower end of the shell of the filter concentrator; if a plane which is perpendicular to the central axis and intersects with the filtering surface of the filter element is taken as a cross section, then: the clear liquid chambers are distributed in the form of a first pattern on the cross section, the first pattern is a closed pattern, the closed pattern is circular or polygonal in shape, the area of the cross section, which is located in the housing of the filter concentrator and is exclusive of the first pattern, is substantially composed of a second pattern and a third pattern, the raw liquid chambers are distributed in the form of the second pattern, the filter material of the filter element is distributed in the form of the third pattern, and the first pattern is distributed in an array on the cross section.

Optionally, the housing of the filtration concentrator is provided with a vertical cylinder, and the vertical cylinder is divided into an upper cylinder, a middle cylinder and a lower cylinder which are sequentially communicated from top to bottom; the upper barrel is provided with the clear liquid discharging structure, the clear liquid discharging structure is respectively connected with the upper end ports of the filter elements through a clear liquid discharging pipe arranged in the upper barrel, and the slurry discharging structure to be concentrated is connected with the slurry feeding structure to be concentrated through a feeding pump; a filter element mounting structure is arranged in the middle barrel, and the filter element is mounted in the middle barrel through the filter element mounting structure; the lower barrel is provided with the slurry feeding structure to be concentrated and the concentrated slurry discharging structure respectively, the slurry feeding structure to be concentrated and the concentrated slurry discharging structure are connected through a feeding pump which is also used as a hydraulic stirring pump to form a hydraulic stirring circulation loop, the hydraulic stirring circulation loop is connected with the slurry discharging structure to be concentrated through a slurry feeding branch to be concentrated, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure through a concentrated slurry backflow branch.

Optionally, when the coprecipitation reaction system operates, the liquid level height in the upper barrel is controlled within a set range, so that the liquid level in the upper barrel is lower than the top of the upper barrel, and a cavity is formed; the top of the upper cylinder is provided with an exhaust structure communicated with the cavity; the exhaust structure is connected with the gas-liquid mixed phase input structure of the gas-liquid separator.

Optionally, the outer edge of the second pattern forms a circular edge, and the first pattern is circular; the first patterns are arranged in the circular edge to form a plurality of horizontal and transverse spaced first pattern columns, each horizontal and transverse spaced first pattern column is composed of a plurality of first patterns spaced along the horizontal and transverse direction, and adjacent horizontal and transverse spaced first pattern columns are arranged at intervals along the horizontal and longitudinal direction; the first patterns in one horizontal transverse interval first pattern column are staggered with the first patterns in the other horizontal transverse interval first pattern column along the horizontal transverse direction; in the circular edge, the diameters of all the first patterns are consistent, the spacing between any two adjacent horizontally transversely spaced first patterns is consistent, and the spacing between any two adjacent horizontally transversely spaced first pattern columns is also consistent.

Optionally, the horizontal pipes of the at least two clear pipe groups are arranged in a staggered manner in the horizontal longitudinal direction; the number of the filter elements respectively connected with the at least two clear pipe groups is basically the same.

Above-mentioned coprecipitation reaction system and be used for coprecipitation reaction system's filtration enrichment facility through the redesign to filtering concentrator inner structure, has cancelled original stirring structure to, because treat concentrated thick liquids feeding structure with concentrated thick liquids ejection of compact structure all sets up filtering concentrator's shell lower extreme, consequently, the accessible is treated the feeding of concentrated thick liquids and is mixed the stirring and avoid the former liquid chamber of particulate matter jam in the thick liquids with concentrated thick liquids. In addition, the diameter of the filtering concentrator can be obviously reduced by redesigning the internal structure of the filtering concentrator, the residence time of the reaction slurry in the filtering concentrator outside the reaction kettle body is effectively reduced, the influence of the independent arrangement of the filtering concentrator on the reaction is greatly reduced, and the consistency of the granularity of the ternary precursor is ensured.

The present application will be further described with reference to the following drawings and detailed description. Additional aspects and advantages of the present application 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.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the present application and are included to explain, by way of illustration, embodiments of the present application and not to limit the embodiments of the present application.

Fig. 1 is a schematic diagram of a co-precipitation reaction system according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a co-precipitation reaction system according to an embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a co-precipitation reaction system according to an embodiment of the present disclosure.

Fig. 4 is a schematic cross-sectional view of a filter concentrator in the coprecipitation reaction system shown in fig. 1.

FIG. 5 is a schematic diagram of the stack of effluent lines of the filter concentrator of the co-precipitation reaction system of FIG. 1.

Fig. 6 is a schematic diagram of a filter concentrator in a coprecipitation reaction system according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a filter concentrator in a coprecipitation reaction system according to an embodiment of the present disclosure.

Fig. 8 is a schematic diagram of a cartridge in the filter concentrator of fig. 6.

Fig. 9 is a schematic view of a cartridge in the filter concentrator of fig. 7.

Fig. 10 is a schematic view of a cartridge in the filter concentrator of fig. 7.

Fig. 11 is a three-dimensional structural diagram of a purge system in a coprecipitation reaction system according to an embodiment of the present disclosure.

Fig. 12 is a three-dimensional block diagram of the system of fig. 11 from another angle.

Fig. 13 is a three-dimensional block diagram of the system of fig. 11 at another angle.

Fig. 14 is a three-dimensional block diagram of the system of fig. 11 at another angle.

Fig. 15 is a three-dimensional structure diagram of the system shown in fig. 14 after the electrical box is hidden.

Fig. 16 is a main schematic view of the system shown in fig. 11.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present application based on these teachings. Before describing the present application in conjunction with the drawings, it is noted that:

the technical solutions and features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, where possible, these technical solutions, technical features and related combinations may be given specific technical subject matter and are protected by the accompanying patent.

The embodiments of the application referred to in the following description are generally only some embodiments, rather than all embodiments, on the basis of which all other embodiments that can be derived by a person skilled in the art without inventive step should be considered within the scope of patent protection.

With respect to the terms and units in this specification: the terms "comprising," "including," "having," and any variations thereof in this specification and in the claims and following claims are intended to cover non-exclusive inclusions. In addition, the term "reactor" in the present description and in the corresponding claims and the relevant parts is not necessarily to be understood as a single reactor, but may also be understood as an integer comprising a main reactor and a secondary reactor, or an integer comprising a reactor and an aging reactor. Other related terms and units can be reasonably construed based on the description to provide related contents.

The applicant of the present application has developed two coprecipitation reaction systems for the preparation of ternary precursors of positive electrode materials for lithium ion secondary batteries before the present application is proposed. The following is a brief description of these two coprecipitation reaction systems in order to provide a full understanding of the present application. For convenience of description, the two coprecipitation reaction systems will be hereinafter referred to as a first coprecipitation reaction system and a second coprecipitation reaction system, respectively.

First coprecipitation reaction system

The first coprecipitation reaction system mainly comprises: a coprecipitation reaction unit and a filtration concentration unit. The filtration and concentration unit may also include a purge system as described below, if desired (depending primarily on the range of products actually sold by the applicant).

The coprecipitation reaction unit comprises a reaction kettle, the reaction kettle is provided with a shell and an inner cavity, the shell of the reaction kettle is respectively provided with a raw material feeding structure, a to-be-concentrated slurry discharging structure and a concentrated slurry backflow structure, the raw material feeding structure, the to-be-concentrated slurry discharging structure and the concentrated slurry backflow structure are respectively communicated with the inner cavity of the reaction kettle, and a stirring structure is arranged in the inner cavity of the reaction kettle.

The filtration concentration unit contains the filtration concentrator, the filtration concentrator has shell and filter core, the filter core is in form stoste chamber and clear solution chamber in the shell of filtration concentrator, be equipped with respectively on the shell of filtration concentrator and remain concentrated thick liquids feeding structure, concentrated thick liquids ejection of compact structure and clear solution ejection of compact structure, wait concentrated thick liquids feeding structure with concentrated thick liquids ejection of compact structure respectively with stoste chamber intercommunication, clear solution ejection of compact structure with clear solution chamber intercommunication.

In addition, a stirring structure is also arranged in the filtering concentrator. The stirring structure in the filtering concentrator comprises a main shaft positioned in the filtering concentrator and a stirring paddle arranged on the main shaft, and the main shaft is driven by a motor outside the filtering concentrator. Filter the filter core in the concentrator then interval arrangement in the stirring rake periphery, can stir thick liquids when the stirring rake is rotatory, prevent that the particulate matter in the thick liquids from subsiding and prolong filter cake formation time on the filter core simultaneously.

The slurry feeding structure is used for being connected with a co-precipitation clear liquid discharging system reaction raw material supply device, and the clear liquid discharging structure is used for being connected with a clear liquid discharging system.

Above-mentioned raw materials feeding structure, treat concentrated thick liquids ejection of compact structure, concentrated thick liquids backward flow knot, treat concentrated thick liquids feeding structure, concentrated thick liquids ejection of compact structure, clear liquid ejection of compact structure can contain the pipeline interface that corresponds respectively, still is equipped with the valve on the pipeline interface when needs.

During the preparation process of the ternary precursor of the lithium ion secondary battery anode material, nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride) and manganese sulfate (or manganese chloride) are prepared into a mixed salt solution with a certain molar concentration, sodium hydroxide is prepared into an alkali solution with a certain molar concentration, ammonia water with a certain concentration is used as a complexing agent, the mixed salt solution, the alkali solution and the complexing agent are added into a reaction kettle at a certain flow rate through a raw material feeding structure, the stirring rate of the reaction kettle, the temperature and the pH value of reaction slurry, the reaction atmosphere (which generally requires the reaction process to be finished under the protection of nitrogen at present) and the like, so that salt and alkali are subjected to neutralization reaction to generate a ternary precursor crystal nucleus and grow gradually. In the reaction kettle operation process, the reaction raw materials are added into the reaction kettle, partial reaction slurry in the reaction kettle is pumped into the filtering concentrator, the filtering concentrator is internally provided with a filter element and is provided with a stirring structure, the reaction slurry is filtered through the filter element and then clear liquid can be output from the filtering concentrator, the clear liquid can be reused for reaction as mother liquid, and the concentrated liquid in the filtering concentrator returns to the reaction kettle through a concentrated slurry backflow structure. When filtering the concentration, the stirring rake rotation in filtering the concentrator stirs thick liquids, prevents that the particulate matter in the thick liquids from subsiding and prolongs the cake formation time of straining on the filter core.

Drawbacks of the first co-precipitation reaction system include: firstly, the internal structure design of the filter concentrator leads to larger volume of the filter concentrator, so that the reaction slurry stays in the filter concentrator outside the reaction kettle for a longer time, the reaction process is influenced by various process parameters, and once the environment changes, the reaction is influenced, so that the consistency of the reaction and the granularity of the ternary precursor is influenced when the slurry stays in the filter concentrator for a longer time. Secondly, the filter element forming time on the surface of the filter element is shorter when high-concentration slurry is treated, and the filtering flux is reduced rapidly. Thirdly, the slurry cannot be dispersed for a long time after forming a filter cake, so that the particles are agglomerated, and the consistency of the product appearance is influenced. Fourth, the tank and the stirring structure of the filtration concentrator are bulky, resulting in high manufacturing and use costs. Fifthly, the motor power of the stirring structure is high, and the energy consumption is high.

Second coprecipitation reaction system

Aiming at the problems brought by the independent arrangement of the filtering concentrator in the first coprecipitation reaction system, the filtering concentrator is cancelled in the second coprecipitation reaction system, and a filter element of the filtering concentrator is directly arranged in the reaction kettle. In this case, the reaction kettle can be called as a coprecipitation reaction and filtration concentration integrated device.

Particularly, coprecipitation reaction and concentrated integration equipment that filters contain reation kettle and the filter core of equipment together, reation kettle has shell and inner chamber, be equipped with raw materials feeding structure, concentrated thick liquids ejection of compact structure and clear liquid ejection of compact structure on reation kettle's the shell respectively, be equipped with the stirring structure in reation kettle's the inner chamber, the filter core is installed form stoste chamber and clear liquid chamber in filtering concentrator's the shell.

The inner chamber of reation kettle with stoste chamber intercommunication, raw materials feeding structure and concentrated thick liquids ejection of compact structure respectively with reation kettle's inner chamber intercommunication, raw materials feeding structure is used for being connected with codeposition reaction raw materials supply apparatus, clear liquid ejection of compact structure with clear liquid chamber intercommunication, clear liquid ejection of compact structure is used for with play clear system connection.

Because the reaction and the filtration concentration are carried out in the coprecipitation reaction and filtration concentration integrated equipment, the reaction slurry is always in the same environment, and the influence of the independent deployment of the filtration concentrator on the reaction is avoided. However, it is noted that: the coprecipitation reaction and filtration concentration integrated equipment has higher requirement on the material damage prevention stability of the filter element. If the filter element is damaged, the reaction slurry is contaminated by the material falling off from the filter element.

In addition, the second coprecipitation reaction system cannot solve the problems that the filter element forming time on the surface of the filter element is short and the filtering flux is reduced rapidly when the coprecipitation reaction and filtering concentration integrated equipment is used for treating high-concentration slurry; after the slurry forms a filter cake, the filter cake cannot be dispersed for a long time, so that the particles are agglomerated, and the consistency of the product appearance is influenced; the tank body and the stirring structure of the coprecipitation reaction and filtration concentration integrated equipment have larger volumes, so that the manufacturing and use cost is higher; the motor power of the stirring structure is large, and the energy consumption is high.

In addition, no matter the first coprecipitation reaction system or the second coprecipitation reaction system, clear liquid filtered by the filter element needs to be output through the clear liquid outlet system. At present, a cleaning system mainly comprises a plurality of parts such as pipelines, valves, backflushing devices and the like, the parts are temporarily installed on site along with the field installation of a filter concentrator or a coprecipitation reaction and filter concentration integrated device, the construction strength is high, the time is long, and the project construction progress is influenced.

Therefore, the present application proposes the following embodiments, which provide corresponding solutions to the technical problem that the reaction is affected by the large volume of the filtering concentrator.

Third coprecipitation reaction system

Fig. 1 is a schematic diagram of a coprecipitation reaction system according to an embodiment of the present application. Fig. 4 is a schematic cross-sectional view of a filter concentrator in the coprecipitation reaction system shown in fig. 1. FIG. 5 is a schematic diagram of the stack of effluent lines of the filter concentrator of the co-precipitation reaction system of FIG. 1. As shown in fig. 1, 4-5, a coprecipitation reaction system includes a coprecipitation reaction unit and a filtration concentration unit. The filtration and concentration unit may also include a purge system as described below, if desired (depending primarily on the range of products actually sold by the applicant).

The coprecipitation reaction unit comprises a reaction kettle 310, wherein the reaction kettle 310 is provided with a shell 311 and an inner cavity 312, the shell 311 of the reaction kettle 310 is respectively provided with a raw material feeding structure 313, a slurry discharging structure 314 to be concentrated and a concentrated slurry backflow structure 315, the raw material feeding structure 313, the slurry discharging structure 314 to be concentrated and the concentrated slurry backflow structure 315 are respectively communicated with the inner cavity 312 of the reaction kettle 310, and a stirring structure 316 is arranged in the inner cavity 312 of the reaction kettle 310.

The filtration concentration unit comprises a filtration concentrator 100, the filtration concentrator 100 is provided with a shell 110 and a filter element 120, the filter element 120 forms a stock solution cavity 111 and a clear solution cavity 121 in the shell 110 of the filtration concentrator 100, the shell 110 of the filtration concentrator 100 is respectively provided with a slurry feeding structure 130 to be concentrated, a concentrated slurry discharging structure 140 and a clear solution discharging structure 150, the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140 are respectively communicated with the stock solution cavity 111, and the clear solution discharging structure 150 is communicated with the clear solution cavity 121.

Wherein, the slurry discharging structure 314 to be concentrated is used for connecting with the slurry feeding structure 130 to be concentrated, the concentrated slurry discharging structure 140 is used for connecting with the concentrated slurry backflow structure 315, the raw material feeding structure 313 is used for connecting with a co-precipitation reaction raw material supply device, and the clear liquid discharging structure 150 is used for connecting with the clear liquid discharging system 200.

In the filter concentrator 100, the filter element 120 has a first edge and a second edge perpendicular to each other, an area of a filtering surface of the filter element is substantially determined by a product of a length of the first edge and a length of the second edge, a direction of the length of the first edge is consistent with a direction of a central axis of the housing 110 of the filter concentrator 100, and the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140 are respectively disposed on the housing 110 of the filter concentrator 100 at positions at two ends in the central axis direction and respectively communicated with two ends of the stock solution chamber 111.

And, if a plane perpendicular to the central axis and intersecting the filtering surface of the filter element 120 is taken as a cross section: in the cross section, the clear liquid chambers 121 are distributed in the form of a first pattern, which is a closed pattern having a shape of a circle or a polygon, the area of the cross section located in the housing 110 of the filter concentrator 100 except for the first pattern is substantially composed of a second pattern and a third pattern, the raw liquid chambers 111 are distributed in the form of the second pattern, the filter material of the filter element 120 is distributed in the form of the third pattern, and the first pattern is arranged in an array on the cross section.

In the coprecipitation reaction system, the internal structure of the filter concentrator 100 is redesigned, so that the original stirring structure is eliminated, and the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140 are respectively arranged on the housing 110 of the filter concentrator 100 and positioned at the two ends of the central axis direction and are respectively communicated with the two ends of the stock solution cavity 111, so that the slurry can flow in the stock solution cavity 111 of the filter concentrator 100 along the central axis direction of the housing 110 of the filter concentrator 100 to prevent particles in the slurry from blocking the stock solution cavity 111, and the filter cake forming time on the filter element 120 is prolonged. In addition, the diameter of the filtering concentrator 100 can be obviously reduced by redesigning the internal structure of the filtering concentrator, the residence time of the reaction slurry in the filtering concentrator 100 outside the reaction kettle 310 is effectively reduced, the influence of the independent arrangement of the filtering concentrator 100 on the reaction is greatly reduced, and the consistency of the granularity of the ternary precursor is ensured.

In a preferred embodiment, the housing 110 of the filtration concentrator 100 has a vertical cylinder, which is divided into an upper cylinder 112, a middle cylinder 113 and a lower cylinder 114, which are sequentially connected from top to bottom.

The upper cylinder 112 is provided with the slurry feeding structure 130 to be concentrated and the clear liquid discharging structure 150, the clear liquid discharging structure 150 is connected to the upper ports of the filter elements 120 through clear liquid discharging pipes 151 arranged in the upper cylinder 112, and the slurry discharging structure 314 to be concentrated is connected to the slurry feeding structure 130 to be concentrated through a feeding pump 160.

Be equipped with filter core mounting structure in the middle part barrel 113, filter core 120 passes through filter core mounting structure installs in middle part barrel 113.

The lower cylinder 114 is provided with the concentrated slurry discharging structure 140 and a hydraulic stirring backflow structure 170, the concentrated slurry discharging structure 140 is connected with the hydraulic stirring backflow structure 170 through a hydraulic stirring pump 180 to form a hydraulic stirring circulation loop, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure 315 through a concentrated slurry backflow branch 190.

The above-mentioned manner firstly defines the filtering concentrator 100 as a vertical structure, and then the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140 are respectively arranged at the upper part and the lower part of the filtering concentrator 100, so as to realize the flowing of the slurry and promote the settling of the particulate matter by means of gravity during the filtering process. On the basis, a hydraulic stirring loop is additionally arranged at the lower part of the filtering concentrator 100, a part of slurry output from the concentrated slurry discharging structure 140 returns to a high-concentration area formed by the lower raw liquid cavity 111 of the filtering concentrator 100 through a hydraulic stirring backflow structure 170, so that the high-concentration area formed by the lower raw liquid cavity 111 of the filtering concentrator 100 is subjected to hydraulic stirring, particulate matter is prevented from being accumulated at the bottom of the filtering concentrator 100 to cause blockage, and the concentrated slurry is promoted to be output through the concentrated slurry discharging structure 140.

Preferably, the lower cylinder 114 further comprises a bottom cone structure, the diameter of the bottom cone structure is gradually reduced from top to bottom, and the lower end of the bottom cone structure is provided with the hydraulic stirring backflow structure 170. The structure can achieve a better hydraulic stirring effect.

In an alternative embodiment, the height of the concentrated slurry outlet structure 140 is higher than that of the hydraulic agitation recirculation structure 170, and in the hydraulic agitation circulation loop, the feed end of the hydraulic agitation pump 180 is connected with the concentrated slurry outlet structure 140, and the discharge end is connected with the hydraulic agitation recirculation structure 170; one end of the concentrated slurry return branch 190 is connected to a conduit between the concentrated slurry outlet structure 140 and the feed end of the hydraulic mixer pump 180 (as shown in fig. 1).

In an alternative embodiment, the height of the concentrated slurry outlet structure 140 is higher than the height of the hydraulic agitation recirculation structure 170, the hydraulic agitation circulation loop has an inlet end of the hydraulic agitation pump 180 connected to the concentrated slurry outlet structure 140 and an outlet end connected to the hydraulic agitation recirculation structure 170, and one end of the concentrated slurry recirculation branch 190 is connected to the pipeline between the hydraulic agitation recirculation structure 170 and the outlet end of the hydraulic agitation pump 180.

The concentrated slurry outlet structure 140 may include a pipe in the lower cylinder 114, which may be in a horizontal ring shape, a horizontal semi-ring shape, or other shapes arranged horizontally, besides the corresponding pipe interface on the side wall of the lower cylinder 114, and an inlet pipe extending along the side wall of the bottom cone structure may be arranged on the pipe.

Preferably, when the coprecipitation reaction system is operated, the liquid level in the upper cylinder 112 is controlled within a set range, so that the liquid level in the upper cylinder 112 is lower than the top of the upper cylinder, and a cavity is formed; the top of the upper cylinder 112 is provided with an exhaust structure communicated with the cavity. Wherein the exhaust structure may be connected with the vapor-liquid mixed phase input structure of the vapor-liquid separator 233.

The preparation process of the ternary precursor of the lithium ion secondary battery anode material generally requires to be completed under the protection of nitrogen, and in addition, compressed gas is also used when the filter element is regenerated (which will be described later), so that an exhaust structure is arranged at the top of the upper cylinder 112, a discharge channel can be provided for the gases, and the influence on the operation of a coprecipitation reaction system is avoided. Because the liquid level in the upper cylinder 112 is controlled within a set range, the liquid level in the upper cylinder 112 is lower than the top of the upper cylinder, and a cavity is formed, so that the top of the upper cylinder can be prevented from being suppressed.

In a typical embodiment, as shown in fig. 4, the filter element 120 is a tubular filter element, whereby the outer edge of the second pattern forms a circular edge. Also, the vertical cylinder of the housing 110 of the filter concentrator 100 is a cylindrical cylinder, and thus, the first pattern is a circle.

The tubular filter element is provided with a first edge and a second edge which are perpendicular to each other. The first edge can be considered as a generatrix of the cylindrical surface formed by the inner pipe of the tubular filter element, and the second edge can be considered as a circle formed by the bottom edge or the top edge of the cylindrical surface formed by the inner pipe of the tubular filter element. Here, the filter area of the tubular filter insert is equal to the product of the length of the first edge and the length of the second edge.

Preferably, the first patterns are arranged in the circular edge to form a plurality of horizontally transversely spaced first pattern columns, each horizontally transversely spaced first pattern column is composed of a plurality of horizontally transversely spaced first patterns, and adjacent horizontally transversely spaced first pattern columns are arranged at intervals along the horizontal longitudinal direction.

And, between adjacent horizontally laterally spaced first pattern columns, the first patterns in one horizontally laterally spaced first pattern column are staggered from the first patterns in another horizontally laterally spaced first pattern column in the horizontal lateral direction.

In addition, the diameter of all the first patterns in the circular edge is consistent, the spacing between any two adjacent horizontally transversely spaced first patterns is consistent, and the spacing between any two adjacent horizontally transversely spaced first pattern columns is also consistent.

After the filter element arrangement mode is adopted, six filter elements 120 which are respectively equidistant to the filter elements are distributed around all the other filter elements 120 except the filter elements 120 which are close to the circular edge. Thus, the rate at which the filter cake forms on these filter elements 120 is nearly uniform, excluding other factors of influence.

In addition, since the first patterns are arranged in the circular edge to form a plurality of horizontally and transversely spaced rows of the first patterns, that is, the filter elements 120 in the housing 110 of the filter concentrator 100 are also arranged to form a plurality of horizontally and transversely spaced rows of filter elements, it is easy to avoid the inconvenience of the staggered pipes in the outlet header 151.

As shown in fig. 5, when the first patterns are arranged in the outer edges of the second patterns to form a plurality of horizontally and transversely spaced first pattern columns, each horizontally and transversely spaced first pattern column is composed of a plurality of horizontally and transversely spaced first patterns, and adjacent horizontally and transversely spaced first pattern columns are arranged at intervals along the horizontal longitudinal direction, the outlet pipe 151 can be divided into at least two outlet pipe groups, each outlet pipe group comprises at least two horizontal transverse pipes 1511, each horizontal transverse pipe 1511 corresponds to one horizontally and transversely spaced first pattern column one by one and is connected with the upper ports of the filter elements 120 in the horizontally and transversely spaced first pattern column one by one through a branch pipe. The horizontal cross pipe 1511 is uniform in direction, so that the clear liquid discharging structure 150 can be conveniently arranged.

Furthermore, the clear liquid discharging structure 150 may include discharging pipes 152 corresponding to the at least two clear liquid discharging pipe groups one to one, each discharging pipe 152 is connected to an output end of each horizontal pipe 1511 in the clear liquid discharging pipe group corresponding one to one, and all the filter elements 120 corresponding to each discharging pipe 152 that output clear liquid with the discharging pipe 152 are a set of filter elements.

In addition, the cleaning system 200 performs backwashing regeneration on the filter elements 120 of the same group at the same time according to the group of the filter elements 120, and performs backwashing regeneration on the filter elements 120 of different groups at different time intervals. By adopting the grouped back flushing regeneration mode, the rest filter elements 120 can continuously work when a group of filter elements 120 are back flushed and regenerated, so that the operation efficiency of the coprecipitation reaction system is improved.

On this basis, as shown in fig. 5, the horizontal transverse tubes 1511 of the at least two supernatant tube groups are arranged alternately in the horizontal longitudinal direction, so that: the number of the filter elements 120 respectively connected to the at least two outlet pipe groups is substantially the same. Since the number of cartridges 120 connected to each of the at least two outlet tube groups is substantially the same (for example, in fig. 5, there are three outlet tube groups, which are connected to cartridges 120 of 18, 19, and 18, respectively, that is, different by 1).

This has the advantage that it is easy to ensure the consistency of the effect of performing the back flushing regeneration on each group of filter elements 120, which helps to make the filtering flux of each group of filter elements 120 approach to be consistent.

Discharging system

The existing clearing system needs to be temporarily installed on site, is high in construction strength and long in time, and influences project construction progress. The effluent system adopting the integral movable effluent module can be used in the first coprecipitation reaction system, the second coprecipitation reaction system or the third coprecipitation reaction system. When the effluent system is used in different coprecipitation reaction systems, the composition of the effluent system may differ, but the overall structure is similar.

Fig. 11 is a three-dimensional structural diagram of a purge system in a coprecipitation reaction system according to an embodiment of the present disclosure. Fig. 12 is a three-dimensional block diagram of the system of fig. 11 at another angle. Fig. 13 is a three-dimensional block diagram of the system of fig. 11 at another angle. Fig. 14 is a three-dimensional block diagram of the system of fig. 11 at another angle. Fig. 15 is a three-dimensional structure diagram of the system shown in fig. 14 after the electrical box is hidden. Fig. 16 is a main schematic view of the system shown in fig. 11. The purge systems shown in FIGS. 11-16 were actually designed for the second co-precipitation reaction system described above. When the purge system is used in different co-precipitation reaction systems, the overall structure remains similar to that shown in FIGS. 11-16, but can be locally modified as desired.

As shown in fig. 11-16, the integral movable discharging module specifically comprises: frame support 220, supernatant delivery and cartridge backwash piping system 210, functional container equipment set 230, and the like.

The frame-type support 220 includes a support base 221 and a bridge 222 disposed on the support base 221, wherein a pipe-type facility installation area 223 is formed on one side of the support base 221 located on the bridge 222, and a functional container-type facility installation area 224 is formed in the bridge 222.

Clear liquid is carried and filter core back flush pipe-line system 210 is installed pipeline class facility installing zone 223, clear liquid is carried and filter core back flush pipe-line system 210 contain with the clear liquid conveyer pipe 211 of the group one-to-one of filter core and equally with the recoil medium conveyer pipe 212 of the group one-to-one of filter core, the output of clear liquid conveyer pipe 211 is connected with clear liquid conveying house steward 215 through the control valve 213 that one-to-one set up, the input of clear liquid conveyer pipe 211 is connected with the clear liquid input interface that is used for being connected with the clear liquid ejection of compact structure of the group of corresponding filter core, the input of recoil medium conveyer pipe 212 is connected with recoil medium conveying house steward 216 through the control valve 214 that one-to-one set up, the output of recoil medium conveyer pipe 212 is connected with the bypass of the clear liquid conveyer pipe 211 of one-to-one.

The

control valves

213 and 214 may be pneumatic valves. By controlling the state of the corresponding control valve 213 and control valve 214, the operating state (filtration or back-flushing regeneration) of a particular group of filter elements can be controlled.

The functional container equipment group 230 is erected on the bridge 222 and located in the functional container facility installation area 224, the functional container equipment group 230 comprises a backflushing device 231, a backflushing medium input structure and a backflushing medium output structure are respectively arranged on a shell of the backflushing device 231, and the backflushing medium output structure is connected with the backflushing medium conveying main pipe 216. The backflushing medium can be either backflushing gas or backflushing liquid.

Typically, the filter cartridges are grouped at 2 or more, and thus, the clear liquid delivery tubes 211 and the backflushing media delivery tubes 212 of the clear liquid delivery and filter cartridge backflushing piping system 210 can both be horizontally and laterally spaced apart so that the clear liquid delivery and filter cartridge backflushing piping system 210 is disposed in the piping-type facility installation area 223.

Because the clear liquid conveying pipes 211 and the backflushing medium conveying pipes 212 in the clear liquid conveying and filter element backflushing pipeline system 210 can be arranged horizontally and transversely at intervals, the central axes of the clear liquid conveying pipes 211 and the central axes of the backflushing medium conveying pipes 212 connected with the clear liquid conveying pipes 211 in a one-to-one correspondence mode can be located in the same vertical plane. In this way, the overall horizontal lateral width of the clear liquid delivery and filter element backwash tubing 210 may be saved.

Because the clear liquid conveying pipes 211 and the backflushing medium conveying pipes 212 in the clear liquid conveying and filter element backflushing pipeline system 210 can be arranged at intervals along the horizontal transverse direction, the clear liquid conveying main pipe 215 can have a clear liquid conveying main pipe horizontal transverse extension section for convenient arrangement, and the output ends of the clear liquid conveying pipes 211 in the clear liquid conveying and filter element backflushing pipeline system 210 are connected with the clear liquid conveying main pipe horizontal transverse extension section through the control valves 213 which are arranged one to one.

Similarly, the backflushing medium delivery manifold 216 may have a horizontal transverse extent of the backflushing medium delivery manifold to which the output end of the backflushing medium delivery pipe 212 in the clear liquid delivery and filter cartridge backflushing piping system 210 is connected via the control valve 214 disposed in a one-to-one relationship.

On this basis, the horizontal transverse extension section of the backflushing medium conveying main pipe can be positioned above the horizontal transverse extension section of the clear liquid conveying main pipe (as shown in fig. 12-13), and the backflushing medium conveying pipes 212 are positioned above the clear liquid conveying pipes 211 corresponding to one another. Therefore, the space can be saved, the pipeline arrangement is convenient, meanwhile, the recoil medium conveying pipe 212 can apply upward force to the clear liquid conveying pipe 211, and the clear liquid conveying pipe 211 can be conveniently positioned.

Thus, the whole pipeline system 210 for clear liquid conveying and filter core backwashing can be supported and fixed only by mounting a clear liquid conveying pipe mounting and positioning device 217 (the clear liquid conveying pipe mounting and positioning device 217 adopts a pipe clamp) with a simple structure on the supporting base 221 and connecting the clear liquid conveying pipe 211 with the clear liquid conveying pipe mounting and positioning device 217.

On the basis of the above-described overall movable type of the emptying module, the present application also provides improvements to the overall movable type of the emptying module, which improvements can be applied to the overall movable type of the emptying module in whole (combined) or in part (separate) to achieve specific functions or to solve specific problems.

Improvements in the first aspect

As shown in fig. 11 to 16, a pipe view mirror 218 is installed at an input end of the clear liquid delivery pipe 211, and a clear liquid input interface for connecting with a clear liquid discharge structure of a corresponding filter element group is connected to the pipe view mirror 218.

Specifically, the input end of the clear liquid conveying pipe 211 is provided with a vertical section, the pipe view mirror 218 is a vertical pipe view mirror and is installed on the vertical section, and the clear liquid input interface is an upper port of the vertical pipe view mirror.

After the pipeline viewing mirror 218 is installed at the input end of the clear liquid conveying pipe 211, the turbidity of the clear liquid in the clear liquid conveying pipe 211 can be observed through the pipeline viewing mirror 218, so as to determine whether the filter elements of the group corresponding to the clear liquid conveying pipe 211 are penetrated, and if the penetration occurs, the control valve 213 on the clear liquid conveying pipe 211 can be closed.

Install the pipe sight glass 218 at the input of clear liquid conveyer pipe 211, not only can judge whether each group of filter core takes place to cross according to the group of filter core, reduce the investigation degree of difficulty, simultaneously, because pipe sight glass 218 is close to recoil ware 231, like this, the accessible is close to recoil and is washed pipe sight glass 218, guarantees the visibility of pipe sight glass 218.

When the input of clear solution conveyer pipe 211 has vertical section, pipeline sight glass 218 adopts vertical pipeline sight glass and installs during on the vertical section, not only conveniently observe, can effectively avoid simultaneously to cross to filter rear-view mirror 218 and take place to block up.

Improvement of the second aspect

As shown in fig. 11 to 16, a pipe type facility installation area 223 is formed on one side of the supporting base 221 located on the bridge 222, a pump type equipment installation area 225 is formed on the other side of the supporting base, and a pump type equipment maintenance operation area 226 is reserved between the pump type equipment installation area 225 and the bridge 222.

In addition, the supernatant discharging system further comprises a pump group 240, the pump group 240 is installed in the pump equipment installation area 225 and comprises a positive pump 241 and a backup pump (not shown in the figure) which are horizontally and transversely arranged at intervals, the positive pump 241 and the backup pump are symmetrically arranged by taking a plumb surface which is arranged in the same direction as the horizontal longitudinal direction as a symmetry plane, the positive pump 241 and the backup pump are mutually connected in parallel and are respectively selectively connected to the supernatant conveying main pipe 215 through valves to form a part of the supernatant conveying main pipe.

The pump unit 240 includes a positive pump 241 and a back-up pump arranged at a horizontal interval, that is, a redundant design is adopted, so as to ensure the stability of the operation of the pump unit 240. A pump equipment maintenance operation area 226 is ingeniously reserved between the pump equipment installation area 225 and the bridge 222, so that the field maintenance of the positive pump 241 and/or the standby pump is facilitated. In addition, the positive pump 241 and the backup pump are symmetrically designed, so that the weight distribution uniformity of the whole movable type discharging module can be improved, the operation vibration of the movable type discharging module is reduced, and the influence is smaller when the positive pump 241 and the backup pump are switched.

The significance of the above-described second aspect improvement applied to the first coprecipitation reaction system, the second coprecipitation reaction system, and the third coprecipitation reaction system is different.

When applied to the first coprecipitation reaction system or the third coprecipitation reaction system, since the first coprecipitation reaction system or the third coprecipitation reaction system is usually provided with a feed pump between the reaction vessel and the filter concentrator, the positive pump 241 and the backup pump can be used as a purge pump through the above-mentioned second aspect modification, and when the output port of the clear liquid delivery manifold 215 needs to be raised (which will be described in detail later), the clear liquid is prevented from flowing backwards.

When the co-precipitation reaction system is applied to the second co-precipitation reaction system, because the first co-precipitation reaction system usually needs to adopt negative pressure to discharge clear liquid, namely a pump needs to be arranged at the downstream of a clear liquid output flow path of the filter element for pumping, at the moment, the positive pump 241 and the standby pump actually provide filtration pressure difference for the filtration and concentration operation of the co-precipitation reaction and filtration and concentration integrated equipment. At this point, it becomes more important to integrate the pump unit 240 into the unitary movable purge module. In this case, the positive pump 241 and the back-up pump are preferably hose pumps.

In addition, as shown in fig. 11 to 16, the frame type support 221 forms an electrical box mounting area on the side opposite to the pump equipment maintenance operation area 226 in both sides of the pump equipment mounting area 225; the overall movable type unclean module further comprises an electrical box 250, and the electrical box 250 is installed in the electrical box installation area.

In addition, the clear liquid delivery manifold 215 includes a lift section 215A located downstream of the positive and back-up pumps; the lifting section 215A is respectively provided with an output port of the clear liquid conveying main pipe, a cleaning liquid input port and a cleaning liquid output port; the cleaning liquid output port is connected to the backflushing medium conveying main pipe through a cleaning liquid conveying pipe 215B, and a control valve 215C is arranged on the cleaning liquid conveying pipe; an L-shaped cantilever 222A may be disposed on a side of the bridge 222 facing the pump equipment installation area 225, and a vertical section of the L-shaped cantilever 222A may respectively connect and support a horizontal section where the output port of the clear liquid conveying main 215 is located and a horizontal section where the cleaning liquid input port is located.

Furthermore, the fluid delivery interfaces in the functional container apparatus set 230 for external connection with the integral removable purge module and the fluid delivery interfaces in the pump set 240 for external connection with the integral removable purge module are oriented in a uniform horizontal cross direction and are not obstructed by structures in the integral removable purge module.

Improvement of the third aspect

As shown in fig. 11 to 16, on the basis of the modification of the second aspect, the functional container apparatus set 230 further includes a heat exchange cooler 232, a clear liquid channel and a cooling medium channel separated from each other by a heat exchange wall are provided in the heat exchange cooler 232, a clear liquid inlet and a clear liquid outlet respectively connected to both ends of the clear liquid channel are provided on a housing of the heat exchange cooler 232, a cooling medium inlet and a cooling medium outlet respectively connected to both ends of the cooling medium channel are further provided on a housing of the heat exchange cooler 232, and the clear liquid inlet and the clear liquid outlet are connected in series to the clear liquid conveying manifold 215 so that the clear liquid channel constitutes a part of the clear liquid conveying manifold 215. The recuperator cooler 232 may employ water as a cooling medium.

The clear liquid can be cooled by the heat exchange cooler 232, and the growth conditions of the ternary precursor particles are destroyed, so that the phenomenon that the ternary precursor particles are further generated in the clear liquid to cause the blockage of the clear liquid conveying main pipe 215, particularly the positive pump 241 and the standby pump is avoided. In addition, when the positive pump 241 and the backup pump adopt the hose pump, the heat exchange cooler 232 can protect the hose in the hose pump after cooling the clear liquid, and the service life of the hose pump is prolonged.

Further, the heat exchange cooler 232 is a vertical container, the clear liquid inlet is located at the upper end of the heat exchange cooler, the clear liquid outlet is located at the lower end of the heat exchange cooler 232, and a pipe section, located between the clear liquid outlet and the positive pump 241 and the backup pump, on the clear liquid conveying header 215 is connected with the clear liquid outlet and the positive pump 241 and the backup pump through the bottom of the pump equipment maintenance operation area 226.

After the heat exchange cooler 232 adopts a vertical container, the occupied area is saved, and the installation on the bridge frame 222 is convenient. On this basis, a clear liquid inlet is arranged at the upper end of the heat exchange cooler 232, a clear liquid outlet is arranged at the lower end of the heat exchange cooler 232, and a pipe section, which is positioned between the clear liquid outlet and the positive pump 241 and the standby pump, on the clear liquid conveying header pipe 215 connects the clear liquid outlet with the positive pump 241 and the standby pump through the bottom of the pump equipment maintenance operation area 226, so that a space as much as possible can be reserved for the pump equipment maintenance operation area 226, and the operation is convenient.

Further, the clear liquid channel is of a vertical tubular structure, the clear liquid inlet is located at the top of the heat exchange cooler 232 and is communicated with the upper port of the vertical tubular structure, and the clear liquid outlet is located at the bottom of the heat exchange cooler 232 and is communicated with the lower port of the vertical tubular structure; and the cooling medium channel is a vertical annular pipe located between the vertical tubular structure and the shell of the heat exchange cooler 232, and the cooling medium inlet and the cooling medium outlet are respectively located at the upper and lower end side portions of the vertical annular pipe.

In addition, a waste water discharge branch 219 is connected to a pipe section of the clear liquid conveying main pipe 215 between the clear liquid outlet and the positive pump 241 and the back-up pump, the waste water discharge branch 219 is located at the lowest position of the height of all liquid flow paths in the integral movable type supernatant module, and a discharge valve is arranged on the waste water discharge branch 219.

Improvement of fourth aspect

As shown in fig. 11 to 16, the backflushing medium input structure of the backflushing device 231 includes a backflushing liquid input structure 231A and a compressed gas input structure 231B, and a backflushing liquid overflow port 231C is further provided on the housing of the backflushing device 231, the backflushing liquid overflow port 231C is connected to the output port of the clear liquid conveying main pipe 215 through a backflushing liquid overflow pipe 231D, so that the output port of the clear liquid conveying main pipe 215 is integrally higher than the backflushing liquid overflow port 231C, and an ascending section 231E is provided on the backflushing liquid overflow pipe 231D. In addition, a control valve may be provided on the back flush overflow pipe 231D.

Typically, the supernatant delivery manifold 215 comprises a lifting section 215A downstream of the supernatant delivery manifold, and the outlet of the supernatant delivery manifold 215 is disposed on the lifting section 215A.

Conventionally, the backflushing device 231 then uses gas backflushing or liquid backflushing, and therefore the backflushing medium input structure is either the backflushing liquid input structure 231A or the compressed gas input structure 231B. Here, the backflushing medium input structure of the backflushing device 231 includes both the backflushing liquid input structure 231A and the compressed gas input structure 231B, so that it is possible to select between gas backflushing and liquid backflushing, or to combine gas backflushing and liquid backflushing.

Based on this, this application can also adopt this kind of innovative recoil mode, namely pour into recoil liquid and compressed gas into the recoil ware 231 through recoil liquid input structure 231A and compressed gas input structure 231B respectively, like this, the inside below of recoil ware 231 is recoil liquid and the top is compressed gas to can utilize compressed gas to promote the recoil liquid fast and flow back the filter core backward, conventional liquid recoil utilizes the diaphragm pump to provide recoil power, and the liquid recoil effect of this kind of mode is limited. But after the innovative recoil mode is adopted, the recoil force is larger.

In addition, by controlling the volume of the backflushing liquid in the backflushing device 231, the volume of the backflushing liquid can be made to be just equal to the sum of the volumes according to the sum of the volumes of the stock solution cavities of the filter element corresponding to each backflushing (for example, the volume of the backflushing liquid is controlled to be 1-1.2 times of the sum of the volumes), so that a better backflushing effect is achieved, the amount of the backflushing liquid with little effect is reduced, and energy consumption is further saved.

Therefore, in order to better control the volume of the backflushing liquid in the backflushing device 231, a backflushing liquid overflow port 231C is provided on the housing of the backflushing device 231, so as to control the liquid level height of the backflushing liquid in the backflushing device 231 and further control the volume of the backflushing liquid in the backflushing device 231. For convenience, the backwash liquid overflow port 231C is connected to the outlet port of the clear liquid delivery manifold 215 via a backwash liquid overflow pipe 231D.

When the back flush overflow port 231C is provided in the housing of the back flush device 231 and the back flush overflow port 231C is connected to the output port of the clear liquid delivery manifold 215 through the back flush overflow pipe 231D, in order to prevent the compressed gas from leaking from the back flush overflow port 231C and the back flush overflow pipe 231D, it is required that the output port of the clear liquid delivery manifold 215 is entirely higher than the back flush overflow port 231C, and the back flush overflow pipe 231D is provided with the rising section 231E, so that a liquid seal can be formed in the back flush overflow pipe 231D to prevent the compressed gas from leaking.

Improvement of fifth aspect

As shown in fig. 11 to 16, the functional container equipment set further comprises a vapor-liquid separator 233, and a vapor-liquid mixed phase input structure 233A, a separated liquid phase output structure 233B and a separated gas phase output structure 233C are respectively provided on the housing of the vapor-liquid separator 233.

When the above-described modification of the fifth aspect is applied to the third coprecipitation reaction system, the vapor-liquid mixed phase input structure 233A, the separated liquid phase output structure 233B, and the separated gas phase output structure 233C of the vapor-liquid separator 233 may be connected to corresponding pipes in the manner shown in fig. 1.

When the above-described modification of the fifth aspect is applied to the first coprecipitation reaction system or the second coprecipitation reaction system, the vapor-liquid mixed phase input structure 233A of the vapor-liquid separator 233 may be communicated with the compressed gas input structure 231B of the backflusher 231 through a communicating pipe, the communicating pipe is connected to a compressed gas source through a gas supply bypass 231D, a control valve 233D is connected in series on the communicating pipe between the vapor-liquid mixed phase input structure 233A and the gas supply bypass 231D, and the gas supply bypass 231D forms a part of the compressed gas input structure 231B.

Thus, when it is necessary to release the air pressure in the backflushing device 231, the control valve 233D may be opened, and the gas-liquid two-phase in the backflushing device 231 enters the gas-liquid separator 103 for gas-liquid separation.

Preferably, the vapor-liquid mixed phase input structure 233A includes a vapor-liquid mixed phase input pipe tangential to a sidewall of the vapor-liquid separator 233, and the communicating pipe is disposed coaxially with the vapor-liquid mixed phase input pipe.

Further, the separated liquid phase output structure 233B is connected to a waste water discharge branch 219.

Fourth coprecipitation reaction system

Fig. 2 is a schematic diagram of a co-precipitation reaction system according to an embodiment of the present disclosure. As shown in fig. 2, a coprecipitation reaction system includes a coprecipitation reaction unit and a filtering concentration unit. The filtration and concentration unit may also include a purge system as described below, if desired (depending primarily on the range of products actually sold by the applicant).

In the filter concentrator 100, the filter element 120 has a first edge and a second edge perpendicular to each other, the area of the filter surface of the filter element is substantially determined by the product of the length of the first edge and the length of the second edge, the direction of the length of the first edge is consistent with the direction of the central axis of the housing of the filter concentrator 100 and is vertically arranged, and the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140 are both arranged at the lower end of the housing of the filter concentrator.

In the coprecipitation reaction system, the internal structure of the filter concentrator 100 is redesigned, so that the original stirring structure is eliminated, and the slurry to be concentrated feeding structure 130 and the concentrated slurry discharging structure 140 are both arranged at the lower end of the housing 110 of the filter concentrator 100, so that the feed of the slurry to be concentrated and the concentrated slurry are mixed and stirred to prevent particles in the slurry from blocking the stock solution cavity, that is, the feed actually plays a role in stirring at the same time. In addition, the diameter of the filtering concentrator 100 can be obviously reduced by redesigning the internal structure of the filtering concentrator 100, the residence time of the reaction slurry in the filtering concentrator 100 outside the reaction kettle body is effectively reduced, the influence of the independent arrangement of the filtering concentrator 100 on the reaction is greatly reduced, and the consistency of the granularity of the ternary precursor is ensured.

The upper cylinder 112 is provided with the clear liquid discharging structure 150, and the clear liquid discharging structure 150 is connected with the upper ports of the filter elements 120 through clear liquid discharging pipes 151 arranged in the upper cylinder 112.

The lower cylinder 114 is provided with the slurry feeding structure 130 to be concentrated, the concentrated slurry discharging structure 140 and a hydraulic stirring backflow structure 170, the slurry feeding structure 130 to be concentrated is connected with the slurry discharging structure 315 to be concentrated through a feeding pump 160, the concentrated slurry discharging structure 140 is connected with the hydraulic stirring backflow structure 170 through a hydraulic stirring pump 180 to form a hydraulic stirring circulation loop, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure 314 through a concentrated slurry backflow branch 190.

By additionally arranging the hydraulic stirring loop at the lower part of the filtering concentrator 100, a part of slurry output from the concentrated slurry discharging structure 140 returns through the hydraulic stirring backflow structure 170, so that a high-concentration area formed by the raw liquid cavity 111 at the lower part of the filtering concentrator 100 is subjected to hydraulic stirring, particulate matter is prevented from being accumulated at the bottom of the filtering concentrator 100 to cause blockage, and the concentrated slurry is promoted to be output through the concentrated slurry discharging structure 140.

Preferably, the lower cylinder 114 further comprises a bottom cone structure, the diameter of the bottom cone structure is gradually reduced from top to bottom, and the hydraulic stirring backflow structure 170 is disposed at the lower end of the bottom cone structure. The structure can achieve a better hydraulic stirring effect.

Preferably, the concentrated slurry return branch 190 is further connected to a pipeline connecting the feeding end of the feeding pump 160 and the slurry discharging structure 315 to be concentrated through a diversion bypass 191, and the flow path of the feeding pump 160 and the flow path of the hydraulic stirring pump 180 are connected in series through the diversion bypass 191 to form a circulation loop. Thus, feed pump 160 and hydraulic agitator pump 180 cooperate to assist feed pump 160 with hydraulic agitator pump 180.

In a preferred embodiment, as shown in fig. 2, the slurry feeding structure 130 to be concentrated, the concentrated slurry discharging structure 140 and the hydraulic stirring and refluxing structure 170 are arranged in sequence from bottom to top, so that an upper hydraulic stirring area and a lower hydraulic stirring area are formed in a high concentration area formed in the lower raw liquid chamber 111 of the filtering concentrator 100, and the concentrated slurry is sufficiently stirred.

The preparation process of the ternary precursor of the lithium ion secondary battery anode material generally requires to be completed under the protection of nitrogen, and in addition, compressed gas is also used when the filter element is regenerated, so that an exhaust structure is arranged at the top of the upper cylinder 112, a discharge channel can be provided for the gases, and the influence on the operation of a coprecipitation reaction system is avoided. Because the liquid level in the upper cylinder 112 is controlled within a set range, the liquid level in the upper cylinder 112 is lower than the top of the upper cylinder, and a cavity is formed, so that the top of the upper cylinder can be prevented from being suppressed.

In a typical embodiment, the filter element 120 is a tubular filter element, whereby the outer edge of the second pattern constitutes a circular edge. Also, the vertical cylinder of the housing 110 of the filter concentrator 100 is a cylindrical cylinder, and thus, the first pattern is a circle.

In addition, in the circular edge, the diameters of all the first patterns are consistent, the spacing between any two adjacent horizontally and transversely spaced first patterns is consistent, and the spacing between any two adjacent horizontally and transversely spaced first pattern columns is also consistent.

When the first patterns are arranged in the outer edges of the second patterns to form a plurality of horizontally and transversely spaced first pattern rows, each horizontally and transversely spaced first pattern row is composed of a plurality of horizontally and transversely spaced first patterns, and adjacent horizontally and transversely spaced first pattern rows are arranged at intervals along the horizontal longitudinal direction, the outlet cleaning pipe 151 comprises horizontal transverse pipes 1511 which are in one-to-one correspondence with the horizontally and transversely spaced first pattern rows, and each horizontal transverse pipe 1511 is connected with the upper ports of the filter elements 120 in the horizontally and transversely spaced first pattern rows which are in one-to-one correspondence through branch pipes. The horizontal cross pipe 1511 is uniform in direction, so that the clear liquid discharging structure 150 can be conveniently arranged.

And, the clear solution outlet structure 150 includes outlet pipes connected to the horizontal cross pipes 1511 at the same time. At this time, the cleaning system 200 performs back flush regeneration on the filter elements 120 of the same group at the same time according to the group of the filter elements 120 (only one group of the filter elements 120 is provided at this time).

The effluent system 200 of the fourth co-precipitation reaction system is substantially the same as the effluent system 200 of the third co-precipitation reaction system, except that the effluent system 200 of the fourth co-precipitation reaction system has only one set of filter elements 120, so the number of related pipeline facilities is correspondingly adjusted, and the volume of the backflushing device is adjusted.

Fifth coprecipitation reaction system

Fig. 3 is a schematic diagram of a co-precipitation reaction system according to an embodiment of the present disclosure. As shown in fig. 3, the fifth coprecipitation reaction system is modified from the fourth coprecipitation reaction system, and the modified fifth coprecipitation reaction system is mainly different from the fourth coprecipitation reaction system in the following way.

In the fifth coprecipitation reaction system, the lower cylinder 114 is provided with the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140, the slurry feeding structure 130 to be concentrated and the concentrated slurry discharging structure 140 are connected by a feeding pump 160 serving as a hydraulic stirring pump 180 to form a hydraulic stirring circulation loop, the hydraulic stirring circulation loop is connected with the slurry discharging structure to be concentrated by a slurry feeding branch to be concentrated, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure by a concentrated slurry backflow branch.

The fifth coprecipitation reaction system feed pump 160 doubles as a hydraulic agitation pump 180, so that the number of pumps is reduced and the manufacturing and use costs are reduced.

Sixth coprecipitation reaction system

Fig. 6 is a schematic diagram of a filter concentrator in a coprecipitation reaction system according to an embodiment of the present application. Fig. 8 is a schematic diagram of a cartridge in the filter concentrator of fig. 6. As shown in fig. 6 and 8, the sixth coprecipitation reaction system is modified from the fourth coprecipitation reaction system, and the modified sixth coprecipitation reaction system is mainly different from the fourth coprecipitation reaction system in the following.

In the filter concentrator of the sixth coprecipitation reaction system, the filter element 120 is a disk-shaped hollow structure and is installed on the discharge pipe 122 at intervals along the axial direction of the discharge pipe 122, a raw liquid cavity is formed outside the filter element 120, a clear liquid cavity is formed inside the filter element 120, and a filter surface is formed by the disk surface, the disk surface of the filter element 120 is perpendicular to the discharge pipe 122, the length direction of the discharge pipe 122 is consistent with the direction of the central axis of the housing 110 of the filter concentrator 100, the discharge pipe 122 is connected with the clear liquid discharge structure, the clear liquid cavity of the filter element is communicated with the discharge pipe, and the shape of the housing 110 of the filter concentrator 100 is adapted to the shape of a filter assembly formed by assembling the filter element 120 on the discharge pipe 122.

According to the coprecipitation reaction system, through redesigning the internal structure of the filter concentrator 100, the diameter of the filter concentrator 100 can be obviously reduced, the residence time of reaction slurry in the filter concentrator 100 outside the reaction kettle body 310 is effectively reduced, the influence of independent arrangement of the filter concentrator 100 on the reaction is greatly reduced, and the uniformity of the granularity of the ternary precursor is ensured.

In a preferred embodiment, a rotating shaft 123 is provided in the filter concentrator 100, the discharge pipe 122 is provided in the rotating shaft 123, and a transmission end of the rotating shaft 123 extends out of the housing 110 of the filter concentrator 100 and is connected to a rotary drive mechanism 124. At this time, the discharge pipe 122 may be connected to the clear liquid discharge structure through a rotary joint.

The rotary drive mechanism 124 generally employs a motor. The rotary driving mechanism 124 drives the filter element 120 assembled on the discharge pipe 122 to rotate integrally through the rotary shaft 123, so as to form a relative motion between the slurry and the filtering surface of the filter element 120, thereby effectively delaying the formation of a filter cake.

An impeller 125 may also be mounted on the rotating shaft 123, and the impeller 125 may include a propeller impeller and/or a turbine impeller. The propeller impeller enables the slurry in the filter concentrator 100 to circulate up and down, preventing the slurry from settling. The turbine impeller can introduce the slurry axially and then discharge radially to assist in dispersive mixing of the slurry.

The impeller 125 and the filter element 120 may be staggered axially along the axis of rotation, which helps to more effectively promote slurry flow over the filter surface of the filter element 120.

In addition, the sixth coprecipitation reaction system can also adopt a concentrated slurry reflux structure design in a third coprecipitation reaction system, a fourth coprecipitation reaction system or a fifth coprecipitation reaction system. In this case, the filter concentrator 100 may not have any relevant structure such as the rotary shaft 123 and the rotary drive mechanism 124.

The filter element 120 may have a disk-shaped hollow structure as shown in fig. 8, and a discharge pipe 122 installation hole is formed at the center thereof so that the filter element 120 is installed on the discharge pipe 122. The filter element with the disc-shaped hollow structure is available and can be purchased on the market.

Seventh coprecipitation reaction system

Fig. 7 is a schematic diagram of a filter concentrator in a coprecipitation reaction system according to an embodiment of the present disclosure. Fig. 9 is a schematic view of a cartridge in the filter concentrator of fig. 7. Fig. 10 is a schematic view of a cartridge in the filter concentrator of fig. 7. As shown in fig. 7 and 9 to 10, the seventh coprecipitation reaction system is improved on the basis of the sixth coprecipitation reaction system, and the main difference between the improved seventh coprecipitation reaction system and the sixth coprecipitation reaction system is as follows.

In the filter concentrator of the seventh coprecipitation reaction system, the filter element 120 is an annular hollow structure and is arranged on the discharge pipe 122 at intervals along the axial direction of the discharge pipe 122, a raw liquid cavity is formed outside the filter element 120, a clear liquid cavity is formed inside the filter element 120, and the outer surface of the filter element forms a filter surface, the central axis of the annular hollow structure of the filter element is consistent with the length direction of the discharge pipe 122, the length direction of the discharge pipe 122 is consistent with the central axis direction of the housing 110 of the filter concentrator 100, the discharge pipe 122 is connected with the clear liquid discharge structure, the clear liquid cavity of the filter element 120 is communicated with the discharge pipe 122, and the shape of the housing 110 of the filter concentrator 100 is adapted to the shape of a filter assembly formed by assembling the filter element 120 on the discharge pipe 122.

An impeller 125 may also be mounted on the rotating shaft 123, and the impeller 125 may include a propeller impeller and/or a turbine impeller. The propeller impeller enables the slurry in the filter concentrator 100 to circulate up and down, preventing the slurry from settling. The turbine impeller can introduce the slurry axially and then discharge radially to aid in dispersive mixing of the slurry.

The impeller 125 and the filter element 120 may be staggered axially along the axis of rotation, which helps to more efficiently promote slurry flow over the filter surface of the filter element 120.

In addition, the seventh coprecipitation reaction system can also adopt a concentrated slurry reflux structure design in the third coprecipitation reaction system, the fourth coprecipitation reaction system or the fifth coprecipitation reaction system. In this case, the filter concentrator 100 may not have any relevant structure such as the rotary shaft 123 and the rotary drive mechanism 124.

The filter element 120 may be a ring-shaped filter element 120A shown in fig. 9, and the ring-shaped filter element 120A is connected to the discharge pipe 122 through a connection structure 126 (communication pipe) disposed between an inner circle of the ring-shaped filter element 120A and the discharge pipe 122.

Alternatively, the filter element 120 may be assembled by connecting a plurality of filter tubes 120B end to end via a connection joint 127 as shown in fig. 9, and the filter element 120B is connected to the discharge tube 122 via a connection structure 126 (connection tube) provided between the connection joint 127 and the discharge tube 122.

The filter tube 120B is easier to manufacture than the annular filter element 120A.

The contents related to the present application are explained above. Those of ordinary skill in the art will be able to implement the present application based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the description above without inventive step, shall fall within the scope of patent protection.

Claims

1. A coprecipitation reaction system comprising:

the device comprises a coprecipitation reaction unit, a stirring unit and a control unit, wherein the coprecipitation reaction unit comprises a reaction kettle, the reaction kettle is provided with a shell and an inner cavity, a raw material feeding structure, a slurry discharging structure to be concentrated and a concentrated slurry backflow structure are respectively arranged on the shell of the reaction kettle, the raw material feeding structure, the slurry discharging structure to be concentrated and the concentrated slurry backflow structure are respectively communicated with the inner cavity of the reaction kettle, and a stirring structure is arranged in the inner cavity of the reaction kettle;

the filtering and concentrating unit comprises a filtering concentrator, the filtering concentrator is provided with a shell and a filter element, the filter element forms a stock solution cavity and a clear solution cavity in the shell of the filtering concentrator, a slurry to be concentrated feeding structure, a concentrated slurry discharging structure and a clear solution discharging structure are respectively arranged on the shell of the filtering concentrator, the slurry to be concentrated feeding structure and the concentrated slurry discharging structure are respectively communicated with the stock solution cavity, and the clear solution discharging structure is communicated with the clear solution cavity;

the slurry discharging structure to be concentrated is used for being connected with the slurry feeding structure to be concentrated, the concentrated slurry discharging structure is used for being connected with the concentrated slurry backflow structure, the raw material feeding structure is used for being connected with co-precipitation reaction raw material supply equipment, and the clear liquid discharging structure is used for being connected with a clear liquid discharging system;

in the filter concentrator, the filter element is provided with a first edge and a second edge which are perpendicular to each other, the area of a filter surface of the filter element is basically determined by the product of the length of the first edge and the length of the second edge, the direction of the length of the first edge is consistent with the direction of a central axis of a shell of the filter concentrator and is vertically arranged, and the slurry feeding structure to be concentrated and the concentrated slurry discharging structure are both arranged at the lower end of the shell of the filter concentrator;

if a plane which is perpendicular to the central axis and intersects with the filtering surface of the filter element is taken as a cross section, then: the clear liquid chambers are distributed in the form of a first pattern on the cross section, the first pattern is a closed pattern, the closed pattern is circular or polygonal in shape, the area of the cross section, which is located in the housing of the filter concentrator and is exclusive of the first pattern, is substantially composed of a second pattern and a third pattern, the raw liquid chambers are distributed in the form of the second pattern, the filter material of the filter element is distributed in the form of the third pattern, and the first pattern is distributed in an array on the cross section.

2. The co-precipitation reaction system of claim 1, wherein: the shell of the filtering concentrator is provided with a vertical cylinder, and the vertical cylinder is divided into an upper cylinder, a middle cylinder and a lower cylinder which are sequentially communicated from top to bottom;

the upper barrel is provided with the clear liquid discharging structure, and the clear liquid discharging structure is respectively connected with the upper end ports of the filter elements through clear liquid discharging pipes arranged in the upper barrel;

a filter element mounting structure is arranged in the middle barrel, and the filter element is mounted in the middle barrel through the filter element mounting structure;

the lower barrel is respectively provided with a slurry feeding structure to be concentrated, a concentrated slurry discharging structure and a hydraulic stirring backflow structure, the slurry feeding structure to be concentrated is connected with the slurry discharging structure to be concentrated through a feeding pump, the concentrated slurry discharging structure is connected with the hydraulic stirring backflow structure through a hydraulic stirring pump to form a hydraulic stirring circulation loop, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure through a concentrated slurry backflow branch;

in addition, optionally, the concentrated slurry backflow branch is further connected with a pipeline between the feeding end connected with the feeding pump and the slurry discharging structure to be concentrated through a diversion bypass, and a flow path where the feeding pump is located and a flow path where the hydraulic stirring pump is located are connected in series through the diversion bypass to form a circulation loop.

3. The co-precipitation reaction system of claim 1, wherein: the shell of the filtering concentrator is provided with a vertical cylinder, and the vertical cylinder is divided into an upper cylinder, a middle cylinder and a lower cylinder which are sequentially communicated from top to bottom;

the upper barrel is provided with the clear liquid discharging structure, the clear liquid discharging structure is respectively connected with the upper end ports of the filter elements through clear liquid discharging pipes arranged in the upper barrel, and the slurry discharging structure to be concentrated is connected with the slurry feeding structure to be concentrated through a feeding pump;

the lower barrel is provided with the slurry feeding structure to be concentrated and the concentrated slurry discharging structure respectively, the slurry feeding structure to be concentrated and the concentrated slurry discharging structure are connected through a feeding pump which is also used as a hydraulic stirring pump to form a hydraulic stirring circulation loop, the hydraulic stirring circulation loop is connected with the slurry discharging structure to be concentrated through a slurry feeding branch to be concentrated, and the hydraulic stirring circulation loop is connected with the concentrated slurry backflow structure through a concentrated slurry backflow branch.

4. The coprecipitation reaction system of claim 2 or 3, wherein: the lower barrel further comprises a bottom conical structure, the diameter of the bottom conical structure is gradually reduced from top to bottom, and the lower end of the bottom conical structure is provided with the slurry feeding structure to be concentrated.

5. The coprecipitation reaction system of claim 2 or 3, wherein: when the coprecipitation reaction system operates, the liquid level height in the upper barrel is controlled within a set range, so that the liquid level in the upper barrel is lower than the top of the upper barrel, and a cavity is formed; the top of the upper cylinder is provided with an exhaust structure communicated with the cavity; the exhaust structure may be connected with the vapor-liquid mixed phase input structure of the vapor-liquid separator.

6. The coprecipitation reaction system of claim 2 or 3, wherein: the outer edge of the second pattern forms a circular edge, and the first pattern is circular;

the first patterns are arranged in the circular edge to form a plurality of horizontal and transverse spaced first pattern columns, each horizontal and transverse spaced first pattern column is composed of a plurality of first patterns spaced along the horizontal and transverse direction, and adjacent horizontal and transverse spaced first pattern columns are arranged along the horizontal and longitudinal direction at intervals;

the first patterns in one horizontal transverse interval first pattern column are staggered with the first patterns in the other horizontal transverse interval first pattern column along the horizontal transverse direction;

in the circular edge, the diameters of all the first patterns are consistent, the spacing between any two adjacent horizontally transversely spaced first patterns is consistent, and the spacing between any two adjacent horizontally transversely spaced first pattern columns is also consistent.

7. The coprecipitation reaction system of claim 2 or 3, wherein: the first patterns are arranged in the outer edge of the second pattern to form a plurality of first pattern columns which are horizontally and transversely spaced, each first pattern column which is horizontally and transversely spaced is composed of a plurality of first patterns which are horizontally and transversely spaced, and adjacent first pattern columns which are horizontally and transversely spaced are horizontally and longitudinally spaced;

the cleaning device comprises a cleaning pipe, a filter element and a cleaning device, wherein the cleaning pipe is divided into at least two cleaning pipe groups, each cleaning pipe group comprises at least two horizontal transverse pipes, each horizontal transverse pipe corresponds to one horizontal transverse interval first pattern row one by one and is respectively connected with the upper end opening of each filter element in the horizontal transverse interval first pattern row one by one through a branch pipe;

the clear liquid discharging structure comprises discharging pipes which are in one-to-one correspondence with the at least two clear liquid discharging pipe groups, each discharging pipe is respectively connected with the output end of each horizontal pipe in the clear liquid discharging pipe group in one-to-one correspondence, and all filter elements corresponding to the discharging pipes for outputting clear liquid are used as a group of filter elements;

the cleaning system performs back-flushing regeneration on the filter elements of the same group according to the group of the filter elements, and performs back-flushing regeneration on the filter elements of different groups in different time.

8. The co-precipitation reaction system of claim 7, wherein: the horizontal transverse pipes of the at least two clear pipe discharging groups are arranged in a staggered manner in the horizontal longitudinal direction; the number of the filter elements which are respectively connected with the at least two clear pipe groups is basically the same.

9. The coprecipitation reaction system of any of claims 1 to 8, wherein: go out clear system and all adopted a whole movable to go out clear module, whole movable goes out clear module specifically contains:

the frame type support comprises a support base and a bridge frame arranged on the support base, wherein a pipeline facility installation area is formed on one side, located on the bridge frame, of the support base, and a functional container facility installation area is formed in the bridge frame;

the system comprises a clear liquid conveying and filter element backwashing pipeline system, a pipeline facility installation area and a pipeline facility installation area, wherein the clear liquid conveying and filter element backwashing pipeline system is installed in the pipeline facility installation area and comprises clear liquid conveying pipes which correspond to the groups of the filter elements one to one and backwashing medium conveying pipes which correspond to the groups of the filter elements one to one, the output ends of the clear liquid conveying pipes are connected with a clear liquid conveying main pipe through one-to-one control valves, the input ends of the clear liquid conveying pipes are connected with a clear liquid input hydraulic stirring backflow structure which is used for being connected with a clear liquid discharging structure of the corresponding groups of the filter elements, the input ends of the backwashing medium conveying pipes are connected with a backwashing medium conveying main pipe through one-to-one control valves, and the output ends of the backwashing medium conveying pipes are connected with bypasses of the clear liquid conveying pipes which correspond to one;

the functional container equipment set is erected on the bridge and located in the functional container type facility installation area, the functional container equipment set comprises a backflushing device, a backflushing medium input structure and a backflushing medium output structure are respectively arranged on a shell of the backflushing device, and the backflushing medium output structure is connected with the backflushing medium conveying main pipe.

10. The co-precipitation reaction system of claim 9, wherein: the input end of the clear liquid conveying pipe is provided with a pipeline sight glass, and the pipeline sight glass is connected with a clear liquid input hydraulic stirring backflow structure which is used for being connected with a clear liquid discharging structure of the corresponding filter element group;

and/or the functional container equipment group comprises a vapor-liquid separator, and a shell of the vapor-liquid separator is respectively provided with a vapor-liquid mixed phase input structure, a separated liquid phase output structure and a separated gas phase output structure;

and/or a pump equipment mounting area is formed on the other side of the bridge frame on the supporting base; the integral movable supernatant module also comprises a pump, the pump is arranged in the pump equipment mounting area, the pump comprises a supernatant pump, and the supernatant pump is connected into the supernatant conveying main pipe to form a part of the supernatant conveying main pipe;

and/or the backflushing medium input structure of the backflushing device comprises a backflushing liquid input structure and a compressed gas input structure, a backflushing liquid overflow port is further arranged on the shell of the backflushing device, the backflushing liquid overflow port is connected to the output port of the clear liquid conveying main pipe through a backflushing liquid overflow pipe, the output port of the clear liquid conveying main pipe is integrally higher than the backflushing liquid overflow port, and a rising section is arranged on the backflushing liquid overflow pipe;

and/or, the functional container equipment set comprises a heat exchange cooler, a clear liquid channel and a cooling medium channel which are separated from each other through a heat exchange wall are arranged in the heat exchange cooler, a clear liquid inlet and a clear liquid outlet which are respectively connected with two ends of the clear liquid channel are arranged on a shell of the heat exchange cooler, a cooling medium inlet and a cooling medium outlet which are respectively connected with two ends of the cooling medium channel are also arranged on the shell of the heat exchange cooler, and the clear liquid inlet and the clear liquid outlet are connected on the clear liquid conveying main pipe in series so that the clear liquid channel forms a part of the clear liquid conveying main pipe.