A method of recovering electrolyte solvent

Abstract

The present application relates to the technical field of solvent recovery, and particularly relates to a method for recovering electrolyte solvent, comprising: sampling electrolyte, performing wall-hanging property experiment, calculating flowability characterization parameter, and determining flow category of the electrolyte; controlling electrolyte to be output to top of evaporation slope through pipe, and heating the evaporation slope; evaporating the electrolyte; detecting thickness average of surface detection point of the evaporation slope to determine whether to collect deposits on the surface of the evaporation slope, in the present application, the electrolyte is placed on the top of the evaporation slope, and the electrolyte flows downward along the evaporation slope, and the evaporation slope heats the electrolyte in the flowing process, which increases the contact area between the electrolyte and the heated part, and improves the evaporation efficiency, the greater the viscosity of the electrolyte, the slower the flow speed on the evaporation slope, and the control precision for flow property of the electrolyte is improved through comprehensive analysis of flow property of the electrolyte.

Description

Technical Field

[0001] This invention relates to the field of solvent recovery technology, and more particularly to a method for recovering electrolyte solvents. Background Technology

[0002] Evaporation of diluted electrolyte solvent can effectively remove impurities, facilitating subsequent solvent processing and recycling. Existing technologies use a combination of evaporator and condenser for solvent recovery, which improves solvent recovery efficiency. However, using an evaporator tank results in a small heating area for the electrolyte and low evaporation efficiency.

[0003] Chinese Patent Application No. CN202410380143.3 discloses a waste battery electrolyte solvent recovery system and method. The waste battery electrolyte solvent recovery system includes a dissolution component and a recovery component. The dissolution component includes a solvent tank and a reaction vessel. The solvent tank is connected to the reaction vessel and introduces the solvent used to dissolve the electrolyte into the reaction vessel. The recovery component includes a first evaporator and a first condenser. The first evaporator receives the primary electrolyte discharged from the reaction vessel and evaporates part of the solvent in the primary electrolyte. The first condenser receives the solvent vapor discharged from the first evaporator and reintroduces the condensed solvent into the solvent tank. Using the waste battery electrolyte solvent recovery system provided by this invention, because only part of the solvent in the primary electrolyte is evaporated, the acidic gas entrained in the solvent is not vaporized in large quantities, thus maintaining the acidic impurity content in the solvent at a low level and avoiding the problem of solvent deterioration caused by excessive acidic impurities.

[0004] However, the following problems still exist in the existing technology.

[0005] The effects of electrolyte properties on the evaporation process were not considered. Furthermore, the small contact area between the electrolyte and the heat source during evaporation affected the evaporation efficiency and effect. Summary of the Invention

[0006] Therefore, the present invention provides a method for recovering electrolyte solvent, which overcomes the problems in the prior art that the influence of electrolyte properties on the evaporation process is not considered in the evaporation process, and that the small contact area between the electrolyte and the heat source during the evaporation process affects the evaporation efficiency and evaporation effect.

[0007] To achieve the above objectives, the present invention provides a method for recovering electrolyte solvent. This method includes:

[0008] Step S1: Obtain the electrolyte after precipitation and filtration, take a sample of the electrolyte, and conduct a wall adhesion test on the obtained sample, including using a viscosity tester to detect the viscosity of the sample, placing the sample at the top of the evaporation slope, and obtaining the flow length of the sample after a predetermined time.

[0009] Step S2: Calculate the flowability characterization parameters based on the viscosity and the flow length to determine the flow type of the electrolyte during evaporation;

[0010] Step S3: Several electrolyte inlet pipes for outputting electrolyte are set at the top of the evaporation slope. The electrolyte inlet pipes are controlled to output electrolyte to the top of the evaporation slope at predetermined time intervals, and the evaporation slope is heated simultaneously.

[0011] Step S4 involves controlling the process parameters during the evaporation process according to the flow type of the electrolyte to evaporate the electrolyte, including:

[0012] Based on the fluidity characterization parameters, the single flow rate of the electrolyte inlet pipe and the slope of the evaporation slope at corresponding time intervals during the evaporation process are adjusted. After a preset time, the average thickness of several detection points on the surface of the evaporation slope is obtained by a laser ranging device, and the predetermined time interval of the electrolyte inlet pipe is corrected based on the average thickness.

[0013] Alternatively, adjust the heating temperature of the evaporation slope;

[0014] Step S5: Detect the average thickness of several detection points on the surface of the evaporation slope to determine whether to collect the sediment on the surface of the evaporation slope.

[0015] Further, in step S1, the process of obtaining the flow length of the sample after a predetermined time includes,

[0016] Acquire surface images of the evaporation slope to determine the sample edge contours;

[0017] Determine the farthest contour point of the sample edge contour in the direction away from the top of the evaporation slope;

[0018] Calculate the distance between the farthest contour point and the top of the evaporation slope, and determine the distance as the flow length.

[0019] Furthermore, the liquidity characterization parameters are calculated according to formula (1).

[0020] S=α×C / C0+β×L0 / L(1)

[0021] In formula (1), S represents the flowability characterization parameter, C is the measured viscosity of the sample, C0 is the preset viscosity, L is the measured flow length of the sample, L0 is the preset flow length, α is the viscosity weighting coefficient, and β is the flow length weighting coefficient.

[0022] Furthermore, determining the flow category of the electrolyte during the evaporation process includes:

[0023] If the fluidity characterization parameter is greater than or equal to the preset fluidity characterization parameter, the flow type of the electrolyte is determined to be a strongly wall-attached liquid.

[0024] If the fluidity characterization parameter is less than the preset fluidity characterization parameter, the fluid flow type of the electrolyte is determined to be a weakly adhering liquid.

[0025] Furthermore, controlling the process parameters during the evaporation process based on the flow type of the electrolyte includes:

[0026] If the electrolyte is a strongly wall-attached liquid, the single flow rate of the electrolyte inlet pipe and the slope of the evaporation slope are adjusted according to the fluidity characterization parameters during the evaporation process. After a preset time, the average thickness of several detection points on the surface of the evaporation slope is obtained by a laser ranging device, and the predetermined time interval of the electrolyte inlet pipe is corrected based on the average thickness.

[0027] If the electrolyte flow type is a weak wall-attached liquid, then adjust the heating temperature of the evaporation slope.

[0028] Further, in step S4, the single-pass volume of the electrolyte inlet pipe and the slope of the evaporation slope are increased at corresponding time intervals during the evaporation process based on the fluidity characterization parameters.

[0029] The increased flow rate and the increased slope are positively correlated with the fluidity characterization parameters.

[0030] Further, in step S4, the predetermined time interval for the electrolyte entering the pipe is increased based on the average thickness, wherein,

[0031] The increase in the predetermined time interval is positively correlated with the mean thickness.

[0032] Further, in step S4, the heating temperature of the evaporation slope is increased based on the fluidity characterization parameter, wherein,

[0033] The increase in heating temperature is negatively correlated with the parameter ratio.

[0034] Further, the determination of whether to collect the sediments on the surface of the evaporation slope includes:

[0035] If the average thickness is greater than or equal to a preset average thickness, it is determined that the sediment on the surface of the evaporation slope should be collected.

[0036] If the average thickness is less than the preset average thickness, it is determined that the sediment on the surface of the evaporation slope will not be collected.

[0037] Furthermore, the sediment on the surface of the evaporation slope is scraped off using a scraper, provided that the sediment on the surface of the evaporation slope is collected.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the electrolyte is placed at the top of the evaporation slope, and the electrolyte flows downward along the evaporation slope. During the flow, the evaporation slope heats the electrolyte, increasing the contact area between the electrolyte and the heated part, thereby improving the evaporation efficiency. The greater the viscosity of the electrolyte, the slower the flow speed on the evaporation slope. Based on the comprehensive analysis of the electrolyte viscosity and the flow length of the electrolyte on the evaporation slope, the flow properties of the electrolyte are improved, thereby improving the control precision of the electrolyte flow properties. The more electrolyte is introduced at one time, the easier it is for the electrolyte to flow downward due to gravity. When the electrolyte is prone to adhering to the wall, the amount of electrolyte introduced at one time is increased, thereby increasing the heating area of ​​the electrolyte, shortening the evaporation time, and improving the evaporation efficiency.

[0039] In particular, this invention calculates flow characterization parameters to characterize the flow properties of the electrolyte. In practice, the flow properties of the electrolyte affect the evaporation effect and its flow on the evaporation slope. Therefore, considering viscosity and flow length measured through wall adhesion experiments, the comprehensive characterization of the electrolyte's flow properties facilitates the subsequent classification of electrolyte flow categories, the adaptive selection of subsequent evaporation methods, and thus, shortens the evaporation time and improves evaporation efficiency and effect.

[0040] In particular, this invention adapts the process parameters of the electrolyte to different flow categories for evaporation. When the electrolyte is a strongly wall-coating liquid, it is difficult to flow and affects the evaporation properties. Therefore, the single-pass flow rate and the slope of the evaporation slope are adjusted to facilitate the flow of the electrolyte on the slope, increase the heating area of ​​the electrolyte, and increase the single-pass flow rate. Since the poor fluidity of the electrolyte leads to aggregation and affects the evaporation effect, the thickness of the deposits on the surface of the evaporation slope is subsequently detected, and the predetermined time interval of the electrolyte inlet pipe is adjusted accordingly. This increases the flow time of the electrolyte on the slope surface, facilitates its spread on the evaporation slope surface, increases the contact area, and improves the evaporation effect.

[0041] In particular, when the electrolyte has weak wall adhesion, the electrolyte has good fluidity and is not easy to adhere to the wall. This can easily lead to the electrolyte flowing out of the evaporation slope before it is fully heated. When the electrolyte has strong fluidity, increasing the temperature of the evaporation slope can increase the evaporation rate of the electrolyte while ensuring the evaporation effect.

[0042] In particular, in this invention, the electrolyte is heated as it flows downward from the top of the evaporation slope, and deposits will be formed on the evaporation slope. These deposits will isolate the subsequently transported electrolyte from the evaporation slope, thus affecting the electrolyte flow. In this invention, the deposits are scraped off when they reach a certain thickness, thereby ensuring the utilization efficiency of the evaporation slope and ensuring the evaporation effect. Attached Figure Description

[0043] Figure 1 This is a flowchart of the method for recovering electrolyte solvent according to the present invention;

[0044] Figure 2 This is a flowchart illustrating the process of determining the flow type of the electrolyte according to the present invention.

[0045] Figure 3 This is a flowchart illustrating the process parameters for controlling the evaporation process according to the present invention.

[0046] Figure 4 This is a flowchart illustrating the process of determining whether to collect sediments from the surface of an evaporation slope according to the present invention. Detailed Implementation

[0047] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0048] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0049] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0050] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Please see Figure 1The diagram shows a flowchart of the method for recovering electrolyte solvent according to the present invention; the embodiments of the present invention provide a method for recovering electrolyte solvent, including:

[0052] Step S1: Obtain the electrolyte after precipitation and filtration, take a sample of the electrolyte, and conduct a wall adhesion test on the obtained sample, including using a viscosity tester to detect the viscosity of the sample, placing the sample at the top of the evaporation slope, and obtaining the flow length of the sample after a predetermined time.

[0053] Step S2: Calculate the flowability characterization parameters based on the viscosity and the flow length to determine the flow type of the electrolyte during evaporation;

[0054] Step S3: Several electrolyte inlet pipes for outputting electrolyte are set at the top of the evaporation slope. The electrolyte inlet pipes are controlled to output electrolyte to the top of the evaporation slope at predetermined time intervals, and the evaporation slope is heated simultaneously.

[0055] Step S4 involves controlling the process parameters during the evaporation process according to the flow type of the electrolyte to evaporate the electrolyte, including:

[0056] Based on the fluidity characterization parameters, the single flow rate of the electrolyte inlet pipe and the slope of the evaporation slope at corresponding time intervals during the evaporation process are adjusted. After a preset time, the average thickness of several detection points on the surface of the evaporation slope is obtained by a laser ranging device, and the predetermined time interval of the electrolyte inlet pipe is corrected based on the average thickness.

[0057] Alternatively, adjust the heating temperature of the evaporation slope;

[0058] Step S5: Detect the average thickness of several detection points on the surface of the evaporation slope to determine whether to collect the sediment on the surface of the evaporation slope.

[0059] Specifically, the present invention does not limit the specific structure of the evaporation slope, which can be any planar structure with an adjustable tilt angle. Preferably, its material cannot react with the electrolyte, which will not be elaborated further.

[0060] Specifically, there are no restrictions on the heating method for the evaporation slope. For example, heating equipment such as electric heating wires can be installed on the evaporation slope to heat the slope and adjust the heating temperature. This will not be elaborated further.

[0061] Specifically, there are no restrictions on the specific structure of the electrolyte inlet pipe that outputs electrolyte to the top of the evaporation slope, as long as it can output electrolyte to the surface of the evaporation slope. For the output power source, any controllable power pump can be used to facilitate the adjustment of the amount of electrolyte inlet pipe flowing into the surface of the evaporation slope, which will not be elaborated further.

[0062] Preferably, there can be multiple electrolyte inlet pipes, which are evenly distributed at the top of the evaporation slope to uniformly introduce electrolyte into the surface of the evaporation slope.

[0063] It is understandable that during the evaporation process, the electrolyte inlet tube operates in a coordinated manner, with a certain amount of electrolyte being introduced each time at corresponding time intervals, which will not be elaborated further.

[0064] Specifically, in this embodiment, the number of detection points is determined based on the area of ​​the evaporation slope. The number of detection points is positively correlated with the area of ​​the evaporation slope, and each detection point is evenly distributed on the surface of the evaporation slope.

[0065] Specifically, the average thickness of several detection points on the surface of the evaporation slope is measured, including: selecting detection points on the evaporation slope where there are deposits, measuring the thickness of each detection point, and calculating the average thickness.

[0066] In this invention, the electrolyte is placed at the top of the evaporation slope and flows downwards along the slope. During the flow, the slope heats the electrolyte, increasing the contact area between the electrolyte and the heated portion, thus improving evaporation efficiency. The higher the viscosity of the electrolyte, the slower its flow velocity on the evaporation slope. Based on a comprehensive analysis of the electrolyte's viscosity and flow length on the evaporation slope, the flow properties of the electrolyte are improved, enhancing the control precision of its flow properties. The more electrolyte introduced at a time, the easier it flows downwards due to gravity. When the electrolyte tends to adhere to the walls, increasing the amount introduced at a time increases the heating area, shortens the evaporation time, and improves evaporation efficiency.

[0067] Specifically, in step S1, the process of obtaining the flow length of the sample after a predetermined time includes,

[0068] Acquire surface images of the evaporation slope to determine the sample edge contours;

[0069] Determine the farthest contour point of the sample edge contour in the direction away from the top of the evaporation slope;

[0070] Calculate the distance between the farthest contour point and the top of the evaporation slope, and determine the distance as the flow length.

[0071] Specifically, the liquidity characterization parameters are calculated according to formula (1).

[0072] S=α×C / C0+β×L0 / L(1)

[0073] In formula (1), S represents the flowability characterization parameter, C is the measured viscosity of the sample, C0 is the preset viscosity, L is the measured flow length of the sample, L0 is the preset flow length, α is the viscosity weighting coefficient, and β is the flow length weighting coefficient.

[0074] Specifically, in this embodiment, the preset viscosity C0 is obtained by pre-measurement. The viscosity of different electrolytes is detected and recorded, and the average viscosity ΔC is calculated. C0 is set to α × ΔC, where α represents the first accuracy coefficient, 0.75 < α < 0.85, the viscosity weighting coefficient c is 0.65, and the flow length weighting coefficient d is 0.35.

[0075] Specifically, in this embodiment, the preset flow length L0 is obtained by pre-measurement. The flow length of different electrolytes on the evaporation slope is detected and recorded, and the average flow length ΔL is calculated. L0 is set to β × ΔL, where β represents the second precision coefficient, and 0.68 < β < 0.82.

[0076] This invention calculates flow characterization parameters to characterize the flow properties of the electrolyte. In practice, the flow properties of the electrolyte affect the evaporation effect and its flow on the evaporation slope. Therefore, viscosity and flow length measured through wall adhesion experiments are considered to comprehensively characterize the flow properties of the electrolyte, which facilitates the subsequent classification of electrolyte flow categories, the adaptive selection of subsequent evaporation methods, and thus shortens the evaporation time, improves evaporation efficiency and evaporation effect.

[0077] Please see Figure 2 As shown, it is a flowchart for determining the flow type of electrolyte.

[0078] Specifically, determining the flow type of the electrolyte during the evaporation process includes:

[0079] If the fluidity characterization parameter is greater than or equal to the preset fluidity characterization parameter, the flow type of the electrolyte is determined to be a strongly wall-attached liquid.

[0080] If the fluidity characterization parameter is less than the preset fluidity characterization parameter, the fluid flow type of the electrolyte is determined to be a weakly adhering liquid.

[0081] Specifically, the preset flow characterization parameters are selected in the range [0.85, 1.2].

[0082] Please see Figure 3 As shown, it is a flowchart for controlling the process parameters during the evaporation process.

[0083] Specifically, controlling the process parameters during the evaporation process based on the flow type of the electrolyte includes:

[0084] If the electrolyte is a strongly wall-attached liquid, the single flow rate of the electrolyte inlet pipe and the slope of the evaporation slope are adjusted according to the fluidity characterization parameters during the evaporation process. After a preset time, the average thickness of several detection points on the surface of the evaporation slope is obtained by a laser ranging device, and the predetermined time interval of the electrolyte inlet pipe is corrected based on the average thickness.

[0085] If the electrolyte flow type is a weak wall-attached liquid, then adjust the heating temperature of the evaporation slope.

[0086] Specifically, in step S4, the single-pass volume of the electrolyte inlet pipe and the slope of the evaporation slope are increased at corresponding time intervals during the evaporation process based on the fluidity characterization parameters.

[0087] The increased flow rate and the increased slope are positively correlated with the fluidity characterization parameters.

[0088] In this embodiment, optionally,

[0089] The liquidity characterization parameter S is compared with the preset first liquidity characterization comparison threshold ΔS1 and the second preset liquidity characterization comparison threshold S2.

[0090] If S≤△S1, then increase the first single inflow Q1, set Q1=0.2×Q0, and increase the first slope P1, set P1=0.12×P0;

[0091] If △S1<S≤△S2, then increase the second single injection quantity Q2, set Q2=0.25×Q0, and increase the second slope P2, set P2=0.15×P0;

[0092] If △S2<S, then increase the third single injection volume Q3, set Q3=0.3×Q0, and increase the third slope P3, set P3=0.2×P0;

[0093] Where Q0 is the initial single injection rate, P0 is the initial slope, ΔS1 = 1.1 × S0, ΔS2 = 1.3 × S0, and S0 represents the preset flow characterization parameters.

[0094] This invention adapts the process parameters of the electrolyte to different flow categories for evaporation. When the electrolyte is a strongly wall-coating liquid, it is difficult to flow and affects the evaporation properties. Therefore, the single-pass flow rate and the slope of the evaporation slope are adjusted to facilitate the flow of the electrolyte on the slope, increase the heating area of ​​the electrolyte, and increase the single-pass flow rate. However, since the poor fluidity of the electrolyte can lead to aggregation and affect the evaporation effect, the thickness of the deposits on the surface of the evaporation slope is subsequently detected, and the predetermined time interval of the electrolyte inlet pipe is adjusted accordingly. This increases the flow time of the electrolyte on the slope surface, facilitating its smooth flow and spreading on the evaporation slope surface, increasing the contact area, and improving the evaporation effect.

[0095] Specifically, in step S4, the predetermined time interval for the electrolyte entering the pipe is increased based on the average thickness, wherein...

[0096] The increase in the predetermined time interval is positively correlated with the mean thickness.

[0097] In this embodiment, optionally,

[0098] The average thickness ΔH is compared with the first preset average thickness ΔH1 and the second preset average thickness ΔH2.

[0099] If △H≤△H1, then increase the first predetermined time interval T1, and set T1=0.15×T0;

[0100] If △H1<△H≤△H2, then increase the second predetermined time interval T2, and set T2=0.2×T0;

[0101] If ΔH2 < ΔH, then increase the third predetermined time interval T3, and set T3 = 0.25 × T0;

[0102] Where T0 is the initial predetermined time interval, △H1=1.1×△H0, △H2=1.3×△H0, and △H0 represents the thickness reference value, which is selected between [1mm, 4mm].

[0103] In this invention, when the electrolyte has weak wall adhesion, the electrolyte has good fluidity and is not easy to adhere to the wall. This can easily lead to the electrolyte flowing out of the evaporation slope before it is fully heated. When the electrolyte has strong fluidity, increasing the temperature of the evaporation slope can increase the evaporation rate of the electrolyte while ensuring the evaporation effect.

[0104] Specifically, in step S4, the heating temperature of the evaporation slope is increased based on the fluidity characterization parameters, wherein,

[0105] The increase in heating temperature is negatively correlated with the fluidity characterization parameters.

[0106] In this embodiment, optionally,

[0107] The liquidity characterization parameter S is compared with the preset first liquidity characterization comparison threshold △S1 and the second preset liquidity characterization comparison threshold △S2.

[0108] If S≤△S1, then increase the first heating temperature W1, and set W1=0.2×W0;

[0109] If △S1<S≤△S2, then increase the second heating temperature W2, and set W2=0.15×W0;

[0110] If ΔS2 < S, then increase the third heating temperature W3, and set W3 = 0.1 × W0;

[0111] Where W0 is the initial predetermined time interval, △S1=1.1×S0, △S2=1.3×S0, and S0 represents the preset flow characterization parameter.

[0112] Please see Figure 4 As shown, it is a flowchart for determining whether to collect sediments from the surface of an evaporation slope.

[0113] Specifically, determining whether to collect the sediments on the surface of the evaporation slope includes:

[0114] If the average thickness is greater than or equal to a preset average thickness, it is determined that the sediment on the surface of the evaporation slope should be collected.

[0115] If the average thickness is less than the preset average thickness, it is determined that the sediment on the surface of the evaporation slope will not be collected.

[0116] Specifically, in this embodiment, to ensure timely removal of deposits, the average thickness is preset to be selected within the range of [2mm, 5mm].

[0117] Specifically, the sediment on the surface of the evaporation slope is scraped off with a scraper, provided that it is determined that the sediment on the surface of the evaporation slope is to be collected.

[0118] Specifically, the form of the scraper is not limited. For example, a slide rail can be set at the edge of the evaporation slope, and a scraper can be set on the slide rail to control the scraper to move on the slide rail to remove the deposits on the surface of the evaporation slope. Of course, other forms can also be used, which will not be elaborated here.

[0119] In this invention, the electrolyte is heated as it flows downward from the top of the evaporation slope. Deposits will accumulate on the evaporation slope, which will isolate the subsequently transported electrolyte from the evaporation slope and thus affect the electrolyte flow. In this invention, the deposits are scraped off when they reach a certain thickness, thereby ensuring the utilization efficiency of the evaporation slope and ensuring the evaporation effect.

[0120] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0121] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for recovering electrolyte solvent, characterized in that, include: Step S1: Obtain the electrolyte after precipitation and filtration treatment; take a sample of the electrolyte; and conduct a wall adhesion test on the obtained sample. This includes using a viscosity tester to detect the viscosity of the sample, placing the sample at the top of an evaporation slope, and obtaining the flow length of the sample after a predetermined time. Step S2: Calculate the flowability characterization parameters based on the viscosity and the flow length to determine the flow type of the electrolyte during evaporation; Step S3: Several electrolyte inlet pipes for outputting electrolyte are set at the top of the evaporation slope. The electrolyte inlet pipes are controlled to output electrolyte to the top of the evaporation slope at predetermined time intervals, and the evaporation slope is heated simultaneously. Step S4 involves controlling the process parameters during the evaporation process according to the flow type of the electrolyte to evaporate the electrolyte, including: Based on the fluidity characterization parameters, the single flow rate of the electrolyte inlet pipe and the slope of the evaporation slope at corresponding time intervals during the evaporation process are adjusted. After a preset time, the average thickness of several detection points on the surface of the evaporation slope is obtained by a laser ranging device, and the predetermined time interval of the electrolyte inlet pipe is corrected based on the average thickness. Alternatively, adjust the heating temperature of the evaporation slope; Step S5: Detect the average thickness of several detection points on the surface of the evaporation slope to determine whether to collect the sediment on the surface of the evaporation slope. The liquidity characterization parameters are calculated according to formula (1). ； In formula (1), S represents the fluidity characterization parameter, C is the measured viscosity of the sample, C0 is the preset viscosity, L is the measured flow length of the sample, L0 is the preset flow length, α is the viscosity weighting coefficient, and β is the flow length weighting coefficient. The determination of the flow category of the electrolyte during the evaporation process includes: If the fluidity characterization parameter is greater than or equal to the preset fluidity characterization parameter, the flow type of the electrolyte is determined to be a strongly wall-attached liquid. If the fluidity characterization parameter is less than the preset fluidity characterization parameter, the fluid flow type of the electrolyte is determined to be a weakly adhering liquid.

2. The method for recovering electrolyte solvent according to claim 1, characterized in that, In step S1, the process of obtaining the flow length of the sample after a predetermined time includes, Acquire surface images of the evaporation slope to determine the sample edge contours; Determine the farthest contour point of the sample edge contour in the direction away from the top of the evaporation slope; Calculate the distance between the farthest contour point and the top of the evaporation slope, and determine the distance as the flow length.

3. The method for recovering electrolyte solvent according to claim 1, characterized in that, The process parameters during evaporation are controlled based on the flow type of the electrolyte, including: If the electrolyte is a strongly wall-attached liquid, the single flow rate of the electrolyte inlet pipe and the slope of the evaporation slope are adjusted according to the fluidity characterization parameters during the evaporation process. After a preset time, the average thickness of several detection points on the surface of the evaporation slope is obtained by a laser ranging device, and the predetermined time interval of the electrolyte inlet pipe is corrected based on the average thickness. If the electrolyte flow type is a weak wall-attached liquid, then adjust the heating temperature of the evaporation slope.

4. The method for recovering electrolyte solvent according to claim 1, characterized in that, In step S4, based on the fluidity characterization parameters, the single-pass volume of the electrolyte inlet pipe during the evaporation process at corresponding time intervals and the slope of the evaporation slope are increased, wherein... The increased flow rate and the increased slope are positively correlated with the fluidity characterization parameters.

5. The method for recovering electrolyte solvent according to claim 1, characterized in that, In step S4, the predetermined time interval for the electrolyte entering the pipe is increased based on the average thickness, wherein... The increase in the predetermined time interval is positively correlated with the mean thickness.

6. The method for recovering electrolyte solvent according to claim 1, characterized in that, In step S4, the heating temperature of the evaporation slope is increased based on the fluidity characterization parameters, wherein, The increase in heating temperature is negatively correlated with the parameter ratio.

7. The method for recovering electrolyte solvent according to claim 1, characterized in that, The determination of whether to collect the sediments on the evaporation slope surface includes: If the average thickness is greater than or equal to a preset average thickness, it is determined that the sediment on the surface of the evaporation slope should be collected. If the average thickness is less than the preset average thickness, it is determined that the sediment on the surface of the evaporation slope will not be collected.

8. The method for recovering electrolyte solvent according to claim 1, characterized in that, The sediment on the surface of the evaporation slope is scraped off with a scraper, provided that the sediment is collected from the surface of the evaporation slope.

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