CN218618269U - Storage tank for lithium carbonate impurity removal process - Google Patents
Storage tank for lithium carbonate impurity removal process Download PDFInfo
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- CN218618269U CN218618269U CN202222575199.3U CN202222575199U CN218618269U CN 218618269 U CN218618269 U CN 218618269U CN 202222575199 U CN202222575199 U CN 202222575199U CN 218618269 U CN218618269 U CN 218618269U
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Abstract
The utility model relates to a lithium carbonate production technical field, specifically lithium carbonate edulcoration storage tank for technology, including a jar body, the lateral wall lower part of jar body is provided with the discharge gate, and the top surface of jar body is provided with the feed inlet, and the bottom surface of jar body is concave surface, and the low point position in the concave surface is provided with row's cinder notch, and row's cinder notch department installs the sediment control valve; the top surface of the tank body is provided with an air blowing pipeline which is vertically inserted into the tank body, and a nozzle is arranged on a pipe body of the air blowing pipeline positioned in the tank body; an exhaust port is arranged on the top surface of the tank body, and an exhaust valve is arranged at the exhaust port. The storage tank is utilized to realize deep reaction of the impurity removing agent which is not completely reacted in the solution after the primary impurity removal and metal ions, the addition amount of the impurity removing agent is reduced, and the reaction rate is accelerated by a blowing mode and a tank bottom reserved seed crystal mode; in addition, after the deep reaction, the metal ion impurities before the lithium precipitation process can meet the requirements, and EDTA does not need to be added for carrying out the complex reaction.
Description
Technical Field
The utility model relates to a lithium carbonate production technical field especially relates to a lithium carbonate storage tank for edulcoration technology.
Background
As a basic raw material for processing and producing lithium battery materials, the battery-grade lithium carbonate has the advantages that the market demand is continuously increased, the quality requirement is continuously improved, and particularly, the impurity requirements on sodium, sulfate radicals, iron, magnesium, aluminum and the like in the product, which have great influence on the chemical performance of the battery, are stricter, so that the impurity removal process becomes an important process for preparing the battery-grade lithium carbonate.
The existing lithium carbonate impurity removal process comprises the following steps: adding the leached and purified lithium sulfate solution into an impurity removal kettle, then adding an impurity removal agent into the impurity removal kettle, specifically adding sodium hydroxide to remove iron ions, aluminum ions and magnesium ions, then adding sodium carbonate to remove calcium ions to complete preliminary impurity removal, filtering the solution subjected to preliminary impurity removal by a precision filter, discharging into a crystallization kettle with a prepared sodium carbonate saturated solution to precipitate lithium, and finally adding EDTA into the crystallization kettle to complex out the remaining metal ions in the solution after the lithium precipitation is completed.
However, the generation of hydroxide and calcium carbonate and the completion of precipitation in the primary impurity removal process take a long time, and the formation of precipitation of trace calcium is difficult under the conditions of no crystal seed intervention and no serious excess of carbonate, so the amount of the added impurity removal agent is far beyond the theoretical requirement; in addition, the higher lithium content in the upper solution in the crystallization kettle after the complexation reaction needs to be recycled in the previous process, but part of the complexation metal ions can be recycled back to the previous process along with the upper solution, the lithium sulfate solution can change color along with the gradual increase of the complex, and the long-term accumulation of the complex can also reduce the impurity removal efficiency.
SUMMERY OF THE UTILITY MODEL
To the problem, the embodiment of the utility model provides a lithium carbonate edulcoration storage tank for technology.
In one aspect of the implementation of the utility model, a storage tank for lithium carbonate impurity removal process is provided, which comprises a tank body, wherein a discharge port is arranged at the lower part of the side wall of the tank body, a feed port is arranged at the top surface of the tank body, the feed port is communicated with the discharge port of the precision filter through a pipeline, the discharge port is communicated with the feed port of a crystallization kettle through a pipeline, the bottom surface of the tank body is a concave surface, a slag discharge port is arranged at the position of a low point in the concave surface, and a slag discharge control valve is arranged at the position of the slag discharge port; the top surface of the tank body is provided with an air blowing pipeline which is vertically inserted into the tank body, and a nozzle is arranged on a pipe body of the air blowing pipeline positioned in the tank body; an exhaust port is arranged on the top surface of the tank body, and an exhaust valve is arranged at the exhaust port.
Compared with the prior art, the beneficial effects of the utility model reside in that: when the storage tank is used for removing impurities, the amount of the required impurity removing agent can be calculated according to the content of impurities in the primary impurity removing process and added into an impurity removing kettle, the solution after primary impurity removal enters the tank body for storage, gas is blown into the solution through a gas blowing pipeline in the storage process to enable the solution to be slowly stirred, the impurity removing agent which is not completely reacted and metal ions in the solution after primary impurity removal are enabled to further perform deep reaction in the storage tank, gas blowing is stopped after the deep reaction is performed for a certain time, precipitate generated by reaction is statically enabled to be precipitated, the precipitate is discharged from a slag discharging port after reaching a certain amount, and a small amount of precipitate is reserved at the bottom of the tank to be used as seed crystal for the next deep reaction to accelerate the reaction rate during slag discharging; after the precipitation is finished, discharging the upper solution into a crystallization kettle through a discharge port to precipitate lithium. The storage tank is used for realizing deep reaction of the impurity removing agent which is not completely reacted in the solution after the primary impurity removal and metal ions, the addition amount of the impurity removing agent is reduced, and the reaction rate is accelerated by a blowing mode and a tank bottom reserved seed crystal mode; and after the deep reaction, the metal ion impurities before the lithium precipitation process can meet the requirements, and EDTA does not need to be added for carrying out the complex reaction.
Optionally, the blowing pipeline is provided with a plurality ofly, and uses the jar body axis as the central line symmetric distribution.
Optionally, a plurality of nozzles are vertically installed on each air blowing pipeline at intervals, and the direction of all the nozzles is the tangential direction of a cylindrical surface which takes the axis of the tank body as a central line.
Optionally, the nozzle is of duckbill type.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a storage tank for a lithium carbonate impurity removal process provided by an embodiment of the present invention;
fig. 2 is a schematic view of a overlooking structure of a storage tank for a lithium carbonate impurity removal process provided by an embodiment of the utility model.
Wherein, jar body 1, discharge gate 2, feed inlet 3, row's cinder notch 4, gas blowing pipeline 5, nozzle 6, gas vent 7.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Referring to fig. 1 and 2, the storage tank for the lithium carbonate impurity removal process provided by the embodiment of the invention comprises a tank body 1, wherein a discharge port 2 is arranged at the lower part of the side wall of the tank body 1, a feed port 3 is arranged on the top surface of the tank body 1, the feed port 3 is communicated with the discharge port of the precision filter through a pipeline, the discharge port 2 is communicated with the feed port of the crystallization kettle through a pipeline, the bottom surface of the tank body 1 is a lower concave surface, a slag discharge port 4 is arranged at the lower position in the lower concave surface, and a slag discharge control valve is arranged at the slag discharge port 4; an air blowing pipeline 5 vertically inserted into the tank body 1 is arranged on the top surface of the tank body 1, and a nozzle 6 is arranged on a pipe body of the air blowing pipeline 5 positioned in the tank body 1; an exhaust port 7 is arranged on the top surface of the tank body 1, and an exhaust valve is arranged at the exhaust port.
In implementation, a plurality of air blowing pipelines 5 are arranged and symmetrically distributed by taking the axis of the tank body 1 as a central line; a plurality of nozzles 6 are vertically arranged on each air blowing pipeline 5 at intervals, the orientation of all the nozzles 6 is the tangential direction of a cylindrical surface taking the axis of the tank body 1 as the central line, the nozzles 6 on each air blowing pipeline 5 can be arranged clockwise, and the solution is blown clockwise and stirred towards the same direction; the nozzle 6 is of duckbill type.
The lithium carbonate impurity removal process carried out by the storage tank by applying the scheme comprises the following steps: adding a leached and purified lithium sulfate solution into an impurity removal kettle, adding an impurity removal agent with a corresponding dose according to the content of metal ion impurities in the impurity removal kettle to carry out primary impurity removal, filtering the solution subjected to the primary impurity removal by a precision filter, and then discharging the filtered solution into a storage tank, after the tank body of the storage tank is filled with the solution, blowing gas into the solution in the tank body through a gas blowing pipeline to slowly stir the solution, so that the impurity removal agent which is not completely reacted in the solution subjected to the primary impurity removal and the metal ion impurities are subjected to deep reaction, and the ion reaction rate can be accelerated by utilizing the gas stirring, so that the impurity removal is more thorough; stopping blowing after the deep reaction is carried out for 20 hours, so that precipitates generated by the deep reaction are statically precipitated, and discharging the precipitated upper-layer solution into a crystallization kettle for precipitating lithium through a discharge port after the precipitates are statically precipitated for 4 hours; the sediment at the lower part in the tank body can be used as seed crystals for removing impurities in the next deep reaction, so that the sediment separation is accelerated, the seed crystals are discharged from a slag discharge port after reaching a certain amount, and a small amount of sediment needs to be reserved at the bottom of the tank during slag discharge;
the storage tank is utilized to further carry out deep reaction on the impurity removing agent which is not completely reacted and metal ion impurities in the solution after primary impurity removal, and the precipitate reserved at the bottom of the tank is used as a crystal seed to accelerate the precipitation of the precipitate, so that excessive impurity removing agent is not required to be added into the impurity removing kettle; in addition, the content of metal ions in the solution can meet the requirement through further deep reaction, and the residual metal ions in the solution can be recycled without adding EDTA (ethylene diamine tetraacetic acid) to complex after the lithium precipitation is finished.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A storage tank for a lithium carbonate impurity removal process comprises a tank body, wherein a discharge port is formed in the lower portion of the side wall of the tank body, a feed port is formed in the top surface of the tank body, the feed port is communicated with the discharge port of a precision filter through a pipeline, and the discharge port is communicated with the feed port of a crystallization kettle through a pipeline; the top surface of the tank body is provided with an air blowing pipeline which is vertically inserted into the tank body, and a nozzle is arranged on a pipe body of the air blowing pipeline positioned in the tank body; an exhaust port is arranged on the top surface of the tank body, and an exhaust valve is arranged at the exhaust port.
2. The storage tank for the lithium carbonate impurity removing process according to claim 1, wherein a plurality of the air blowing pipelines are arranged and are symmetrically distributed by taking the axis of the tank body as a central line.
3. The storage tank for the impurity removing process of the lithium carbonate as claimed in claim 2, wherein a plurality of nozzles are vertically installed on each air blowing pipeline at intervals, and all the nozzles are oriented in the tangential direction of a cylindrical surface with the axis of the tank body as the center line.
4. The storage tank for the impurity removing process of lithium carbonate according to any one of claims 1 to 3, wherein the nozzle is of a duckbill type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222575199.3U CN218618269U (en) | 2022-09-28 | 2022-09-28 | Storage tank for lithium carbonate impurity removal process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222575199.3U CN218618269U (en) | 2022-09-28 | 2022-09-28 | Storage tank for lithium carbonate impurity removal process |
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| Publication Number | Publication Date |
|---|---|
| CN218618269U true CN218618269U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222575199.3U Active CN218618269U (en) | 2022-09-28 | 2022-09-28 | Storage tank for lithium carbonate impurity removal process |
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| CN (1) | CN218618269U (en) |
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- 2022-09-28 CN CN202222575199.3U patent/CN218618269U/en active Active
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