阅读说明：本技术 一种从盐湖卤水中提锂的吸附塔群及提锂方法 (Adsorption tower group for extracting lithium from salt lake brine and lithium extraction method ) 是由 袁东 胡羽 于 2020-07-13 设计创作，主要内容包括：本发明公开的一种从盐湖卤水中提锂的吸附塔群,包括洗脱剂调节储罐、废液罐、M个洗脱剂储罐和N个吸附塔,其中,所述N个吸附塔中填充锰系锂离子筛吸附剂,所述洗脱剂调节储罐的出口连接至M个洗脱剂储罐,每个吸附塔与其中一个洗脱剂储罐形成循环连接,同时每个吸附塔的出口均连接至废液罐；初步过滤之后的盐湖卤水经过N个吸附塔进入废液罐中,洗脱剂储罐中的洗脱剂通过N个吸附塔,并循环至对应的洗脱剂储罐中,得到位于洗脱剂储罐中的解析液；所述解析液浓缩得到含锂溶液。本发明提供的一种从盐湖卤水中提锂的吸附塔群及提锂方法,工艺简单,操作容易,极大得缩减了提锂的成本和时间。(The invention discloses an adsorption tower group for extracting lithium from salt lake brine, which comprises an eluent adjusting storage tank, a waste liquid tank, M eluent storage tanks and N adsorption towers, wherein manganese-based lithium ion sieve adsorbents are filled in the N adsorption towers, the outlets of the eluent adjusting storage tanks are connected to the M eluent storage tanks, each adsorption tower is in circulating connection with one of the eluent storage tanks, and the outlet of each adsorption tower is connected to the waste liquid tank; allowing the salt lake brine subjected to preliminary filtration to pass through N adsorption towers and enter a waste liquid tank, allowing the eluent in an eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so as to obtain an analytic liquid in the eluent storage tank; and concentrating the desorption solution to obtain a lithium-containing solution. The adsorption tower group and the lithium extraction method for extracting lithium from salt lake brine provided by the invention have the advantages of simple process and easiness in operation, and greatly reduce the cost and time for extracting lithium.)

1. An adsorption tower group for extracting lithium from salt lake brine is characterized by comprising an eluent adjusting storage tank, a waste liquid tank, M eluent storage tanks and N adsorption towers, wherein manganese-based lithium ion sieve adsorbents are filled in the N adsorption towers, outlets of the eluent adjusting storage tanks are connected to the M eluent storage tanks, each adsorption tower is in circulating connection with one of the eluent storage tanks, and outlets of the adsorption towers are connected to the waste liquid tank; m and N are both integers greater than 0;

allowing the salt lake brine after preliminary filtration to pass through N adsorption towers and enter a waste liquid tank, so that lithium ions in the salt lake brine are adsorbed on a manganese lithium ion sieve adsorbent; enabling the eluent in the eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so that the lithium ions adsorbed in the manganese lithium ion sieve adsorbent are separated from the eluent, and obtaining an analytic solution in the eluent storage tank; and concentrating the desorption solution to obtain a lithium-containing solution.

2. The group of adsorption towers for extracting lithium from salt lake brine according to claim 1, wherein the eluent storage tank and the adsorption towers are connected in a circulating manner through two acid-resistant pipelines, and a one-way valve and an acid-resistant pump which are arranged in the acid-resistant pipelines.

3. The adsorption tower group for extracting lithium from salt lake brine as claimed in claim 1, wherein the eluent storage tank and the eluent regulating storage tank are connected through an acid-proof pipeline, a one-way valve and an acid-proof pump.

4. The adsorption tower group for extracting lithium from salt lake brine according to claim 1, wherein the inner lining of the eluent storage tank is made of a material resistant to high temperature and acid, and the eluent storage tank further comprises a pH meter, a liquid level meter, a stirring paddle and flow meters at each outlet.

5. The adsorption tower group for extracting lithium from salt lake brine according to claim 1, wherein the eluent is 0.1-2mol/L hydrochloric acid solution, 0.1-2mol/L nitric acid solution, 0.1-2mol/L oxalic acid solution, 0.05-1mol/L phosphoric acid solution or 0.05-1mol/L sulfuric acid solution.

6. The absorption tower group for extracting lithium from salt lake brine as claimed in claim 1, wherein the cleaning solution is deionized water or distilled water or filtered river water.

7. The group of adsorption towers for extracting lithium from salt lake brine according to claim 1, wherein the temperature for extracting the lithium-containing solution from the group of adsorption towers is between-20 ℃ and 80 ℃.

8. The adsorption tower group for extracting lithium from salt lake brine according to claim 1, wherein the salt lake brine has a pH value of 5-12 and a lithium ion concentration of 1ppm or more.

9. The adsorption tower group for extracting lithium from salt lake brine according to claim 1, wherein the concentration of lithium ions in the desorption solution is 1g/L-10 g/L.

10. A method for extracting lithium from salt lake brine by using the adsorption tower group of claim 1, which is characterized by comprising the following steps:

s01: the salt lake brine after primary filtration respectively enters a waste liquid tank through N adsorption towers; so that lithium ions in the salt lake brine are adsorbed on the manganese lithium ion sieve adsorbent;

s02: cleaning liquid enters a waste liquid tank through N adsorption towers respectively to remove impurity ions in the manganese lithium ion sieve adsorbent;

s03: enabling the eluent in the eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so that the lithium ions adsorbed in the manganese lithium ion sieve adsorbent are separated from the eluent, and obtaining an analytic solution in the eluent storage tank;

s04: stirring the analytic liquid by the stirring paddles in the M eluent storage tanks, detecting the pH value of the analytic liquid by the pH meter, controlling the eluent adjusting storage tanks by the control center according to the detection result to inject the adjusting agent into the eluent storage tanks, and enabling the pH value of the analytic liquid to reach a threshold value;

s05: repeating the steps S03-S04X times, then repeating the step S03 to obtain an analytic solution in an eluent storage tank, and concentrating the analytic solution to obtain a lithium-containing solution; x is an integer greater than 0;

s06: and cleaning liquid enters a waste liquid tank through N adsorption towers respectively to clean the eluent in the adsorption towers.

Technical Field

The invention relates to the field of lithium ion purification, in particular to an adsorption tower group for extracting lithium from salt lake brine and a lithium extraction method.

Background

Lithium is the lightest metal element in nature, and is the lightest and most active alkali metal in the group IA alkali metal head position in the periodic table. Because of its wide application field, it is praised as "industrial monosodium glutamate"; lithium is also known as an "energy metal" because it has the highest standard oxidation potential of various elements and is therefore the most undeniable element in the battery and power field.

According to different raw materials, the lithium extraction process can be divided into two process routes of ore lithium extraction and brine lithium extraction. The process route adopted for extracting lithium from ores is the earliest, the total lithium reserve in the ores is small, the energy consumption is large, and high-quality resources are nearly exhausted after being mined for hundreds of years, so that the production cost is high, the lithium resources of salt lake brine account for 71 percent of the lithium resource reserve in China, and the process for extracting lithium from brine is relatively simple and relatively low in cost, so that the process for extracting lithium from brine becomes a mainstream research process.

The lithium content in salt lakes of Qinghai Tibet and other places is high, in the current lithium extraction method, the salt lake of Tibet mainly uses a solar pond method to extract lithium industrially, the production period from salt lake brine to lithium resource products is long, statistics is generally carried out by taking years as units, the consumed time is long, and the lithium extraction efficiency is seriously influenced. The Qinghai salt lake is mainly used for industrially extracting lithium by using an aluminum adsorption method, the method needs to carry out pretreatment such as temperature rise on salt lake brine, more power consumption is inevitably increased by the pretreatment such as temperature rise in a high-altitude low-temperature environment, the concentration of a lithium-containing solution extracted by the method is low, and a multi-step purification process is needed subsequently, so that the whole extraction process is time-consuming and labor-consuming.

In order to simplify the process of extracting lithium from salt lake brine, a new method for extracting lithium from salt lake brine, which is suitable for high altitude areas such as Qinghai Tibet and areas with relatively poor industrial foundation, needs to be found.

Disclosure of Invention

The invention aims to provide an adsorption tower group for extracting lithium from salt lake brine and a lithium extraction method, which have the advantages of simple process and easy operation, and greatly reduce the cost and time for extracting lithium.

In order to achieve the purpose, the invention adopts the following technical scheme: an adsorption tower group for extracting lithium from salt lake brine comprises an eluent adjusting storage tank, a waste liquid tank, M eluent storage tanks and N adsorption towers, wherein a manganese lithium ion sieve adsorbent is filled in the N adsorption towers, the outlets of the eluent adjusting storage tanks are connected to the M eluent storage tanks, each adsorption tower is in circulating connection with one of the eluent storage tanks, and the outlet of each adsorption tower is connected to the waste liquid tank; m and N are both integers greater than 0;

allowing the salt lake brine after preliminary filtration to pass through N adsorption towers and enter a waste liquid tank, so that lithium ions in the salt lake brine are adsorbed on a manganese lithium ion sieve adsorbent; enabling the eluent in the eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so that the lithium ions adsorbed in the manganese lithium ion sieve adsorbent are separated from the eluent, and obtaining an analytic solution in the eluent storage tank; and concentrating the desorption solution to obtain a lithium-containing solution.

Further, the eluent storage tank and the adsorption tower are in circulating connection through two acid-proof pipelines, a one-way valve and an acid-proof pump, wherein the one-way valve and the acid-proof pump are positioned in the acid-proof pipelines.

Further, the eluent storage tank and the eluent adjusting storage tank are connected through an acid-proof pipeline, a one-way valve and an acid-proof pump.

Further, the eluant storage tank inside lining adopts the material of high temperature resistant acid resistance, still include pH meter, level gauge, stirring rake and be located the flowmeter of each exit in the eluant storage tank.

Further, the eluent is 0.1-2mol/L hydrochloric acid solution or 0.1-2mol/L nitric acid solution or 0.1-2mol/L oxalic acid solution or 0.05-1mol/L phosphoric acid solution or 0.05-1mol/L sulfuric acid solution.

Further, the cleaning solution is deionized water or distilled water or filtered river water.

Further, the temperature range of the lithium-containing solution extracted by the adsorption tower group is minus 20 ℃ to 80 ℃.

Further, the pH value of the salt lake brine is 5-12, and the lithium ion concentration is more than or equal to 1 ppm.

Furthermore, the concentration of lithium ions in the analysis solution is 1g/L-10 g/L.

A method for extracting lithium from salt lake brine by adopting an adsorption tower group comprises the following steps:

s01: the salt lake brine after primary filtration respectively enters a waste liquid tank through N adsorption towers; so that lithium ions in the salt lake brine are adsorbed on the manganese lithium ion sieve adsorbent;

s02: cleaning liquid enters a waste liquid tank through N adsorption towers respectively to remove impurity ions in the manganese lithium ion sieve adsorbent;

s03: enabling the eluent in the eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so that the lithium ions adsorbed in the manganese lithium ion sieve adsorbent are separated from the eluent, and obtaining an analytic solution in the eluent storage tank;

s04: stirring the analytic liquid by the stirring paddles in the M eluent storage tanks, detecting the pH value of the analytic liquid by the pH meter, controlling the eluent adjusting storage tanks by the control center according to the detection result to inject the adjusting agent into the eluent storage tanks, and enabling the pH value of the analytic liquid to reach a threshold value;

s05: repeating the steps S03-S04X times, then repeating the step S03 to obtain an analytic solution in an eluent storage tank, and concentrating the analytic solution to obtain a lithium-containing solution; x is an integer greater than 0;

s06: and cleaning liquid enters a waste liquid tank through N adsorption towers respectively to clean the eluent in the adsorption towers.

The invention has the following beneficial effects: compared with a solar pond method, the method can shorten the production period of extracting lithium from salt lake brine from year to hour, and greatly improves the production efficiency; compared with an aluminum adsorption method, the method reduces the pretreatment of salt lake brine and the concentration process treatment of the extracting solution, and greatly reduces the production cost of the lithium extraction process; in addition, the method can be normally used at the temperature of minus 20 ℃, and is suitable for the low-temperature environment of high-altitude areas; the method has simple process and easy operation, and is particularly suitable for areas with relatively poor industrial foundations such as Qinghai Tibet and the like; the finally obtained desorption solution has high lithium content, simplifies the subsequent concentration process and greatly reduces the production cost.

Drawings

FIG. 1 is a schematic diagram of a framework of a column group in example 1 of the present invention.

In the figure: 1 adsorption tower, 2 adsorption towers, 3 adsorption towers, 4 eluent storage tanks and 5 eluent regulation storage tanks.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings.

An adsorption tower group for extracting lithium from salt lake brine comprises an eluent adjusting storage tank, a waste liquid tank, M eluent storage tanks and N adsorption towers, wherein a manganese lithium ion sieve adsorbent is filled in the N adsorption towers, the outlets of the eluent adjusting storage tanks are connected to the M eluent storage tanks, each adsorption tower is in circulating connection with one of the eluent storage tanks, and the outlet of each adsorption tower is connected to the waste liquid tank; m and N are both integers greater than 0. Allowing the salt lake brine after preliminary filtration to pass through N adsorption towers and enter a waste liquid tank, so that lithium ions in the salt lake brine are adsorbed on a manganese lithium ion sieve adsorbent; enabling the eluent in the eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so that the lithium ions adsorbed in the manganese lithium ion sieve adsorbent are separated from the eluent, and obtaining an analytic solution in the eluent storage tank; and concentrating the analysis solution to obtain a lithium-containing solution.

FIG. 1 is a schematic view of a group of adsorption towers including an eluent adjusting tank, 3 adsorption towers and 1 eluent tank in example 1, wherein a waste liquid tank is not shown. The top outlets of the adsorption columns 1, 2 and 3 are connected to one of the inlets of the eluent storage tank through an acid-proof pipe, a check valve and an acid-proof pump, and the eluent or the desorption solution in the acid-proof pipe flows into the eluent storage tank from the adsorption columns in a single direction. The bottom inlets of the adsorption columns 1, 2 and 3 are connected to one of the outlets of the eluent storage tank through an acid-proof pipe, a check valve and an acid-proof pump, and the eluent or the desorption solution in the acid-proof passage flows into the adsorption column from the eluent storage tank in a single direction. The invention adopts the last cycle connection mode and can realize one cycle or multiple cycles through the on-off control of the one-way valve.

Referring to fig. 1, the lining of the eluent storage tank 4 is made of a material resistant to high temperature (200 ℃) and acid corrosion, and the eluent storage tank further includes a pH meter, a level meter, a stirring paddle, and flow meters at each outlet. The stirring paddle is connected with the motor, is positioned on the upper part of the eluent storage tank and is used for driving the eluent or the analytic liquid in the eluent storage tank to be uniformly stirred, the pH meter and the liquid level meter are used for detecting the pH value and the liquid level of the analytic liquid, and the flow meter at the outlet is used for detecting the liquid flow of the eluent storage tank flowing into each adsorption tower. The adsorption tower of the invention is filled with manganese lithium ion sieve adsorbent, and the eluent can be but not limited to 0.1-2mol/L hydrochloric acid solution, 0.1-2mol/L nitric acid solution, 0.1-2mol/L oxalic acid solution, 0.05-1mol/L phosphoric acid solution or 0.05-1mol/L sulfuric acid solution.

With continued reference to fig. 1, the eluent adjustment tank 5 contains a high concentration of eluent, such as 30-100% by mass, which has the same composition as the eluent in the eluent tank but a higher concentration than the eluent in the eluent tank. The eluent adjusting storage tank 5 is connected with the eluent storage tank 4 through an acid-proof pipeline, a one-way valve and an acid-proof pump, the high-concentration eluent in the eluent adjusting storage tank 5 flows into the eluent storage tank 4 in a one-way mode, and the main function of the high-concentration eluent is to adjust the pH value of the analysis liquid in the eluent storage tank 4. Specifically, a pH meter, a level meter, a stirring paddle, flow meters at each outlet, and an eluent adjusting storage tank 5 in the eluent storage tank 4 may be connected to the control center, the control center automatically calculates the volume of the high-concentration eluent to be supplemented according to the detected pH value, and controls the eluent adjusting storage tank 5 to input the volume of the high-concentration eluent into the eluent storage tank 4.

The invention can be carried out in an environment with the temperature range of 20 ℃ to 80 ℃ below zero, namely, the invention is also applicable to the environment with high altitude and low temperature.

The invention is suitable for any lithium-containing salt lake with the pH value of the salt lake brine in the range of 5-12, and the concentration of lithium ions in the salt lake brine is more than or equal to 1 ppm. Preferably, the salt lake brine is derived from salt lakes in Tibet or Qinghai regions. The concentration of lithium ions in the finally obtained analytic solution is 1g/L-10 g/L.

The invention relates to a method for extracting lithium from salt lake brine by adopting an adsorption tower group, which comprises the following steps:

s01: the salt lake brine after primary filtration respectively enters a waste liquid tank through N adsorption towers; so that the lithium ions in the salt lake brine are adsorbed on the manganese lithium ion sieve adsorbent.

The manganese-based lithium ion sieve adsorbent can adopt any manganese-based lithium ion sieve adsorbent in the prior art, and specifically can be but not limited to one or more of a porous manganese-based lithium ion sieve adsorbent, a hexagonal flaky manganese-based lithium ion sieve adsorbent and a hexagonal dendritic manganese-based lithium ion sieve adsorbent.

The step can be but not limited to filtering out granular impurities in the salt lake brine by adopting a filter screen, and is mainly used for removing granular impurities such as sand and stone in the salt lake brine. The specific filtering screen or the mesh number of the filtering screen can be selected according to the process requirements.

In the actual process, according to the volume of the manganese-based lithium ion sieve adsorbent, the salt lake brine can enter the adsorption tower at a space velocity of 5-30BV/h, and the retention time of the salt lake brine in the adsorption tower is 0.1-20 hours, so that the lithium ions in the salt lake brine are fully adsorbed on the manganese-based lithium ion sieve adsorbent. The specific space velocity and residence time may be selected according to the process requirements and equipment.

S02: and cleaning liquid enters the waste liquid tank through the N adsorption towers respectively to remove impurity ions in the manganese-based lithium ion sieve adsorbent.

The cleaning solution in this step is deionized water or distilled water or filtered river water, and the purpose of cleaning is to remove impurity ions, such as iron ions, sodium ions, and the like, in the manganese-based lithium ion sieve adsorbent. In the manganese-based lithium ion sieve adsorbent, about 99% of hydrogen ions in the manganese-based lithium ion sieve adsorbent are subjected to ion exchange with lithium ions in salt lake brine, and the rest about 1% of hydrogen ions are subjected to ion exchange with impurity ions in the salt lake brine, wherein the impurity ions have the radius or charge distribution close to that of the lithium ions. Through the reasonable volume of setting up manganese lithium ion sieve adsorbent, can ensure that the lithium ion in salt lake brine is basically all adsorbed in manganese lithium ion sieve adsorbent, at this moment, adopt the washing liquid to wash, can get rid of most other impurity ions except the lithium ion in salt lake brine.

The filtered river water can be used for cleaning in the step, mainly considering that the river water has wide sources and low cost and can be obtained without any treatment. The river water is near fresh water, and basically does not contain other impurity ions, and the filtered river water is similar to deionized water and only plays a role in flushing the manganese-based lithium ion sieve adsorbent.

In the actual process, according to the volume of the manganese-based lithium ion sieve adsorbent, the cleaning agent can pass through the manganese-based lithium ion sieve adsorbent at a space velocity of 5-30BV/h, and the retention time of the cleaning agent in the manganese-based lithium ion sieve adsorbent is 0.05-10 hours, so that impurity ions in the manganese-based lithium ion sieve adsorbent are sufficiently removed. The specific space velocity and residence time may be selected according to the process requirements and equipment.

S03: and enabling the eluent in the eluent storage tank to pass through the N adsorption towers and circulate to the corresponding eluent storage tank, so that the lithium ions adsorbed in the manganese lithium ion sieve adsorbent are separated from the eluent, and obtaining the analytic liquid in the eluent storage tank.

The eluent in the invention can be but is not limited to 0.1-2mol/L hydrochloric acid solution or 0.1-2mol/L nitric acid solution or 0.1-2mol/L oxalic acid solution or 0.05-1mol/L phosphoric acid solution or 0.05-1mol/L sulfuric acid solution. In the process that the eluent passes through the adsorption tower, lithium ions adsorbed in the manganese lithium ion sieve adsorbent are replaced, and the lithium ions flow into the eluent storage tank along with the eluent, wherein the eluent containing the lithium ions is the analytic liquid.

In the actual process, the eluent can pass through the adsorption tower at the space velocity of 5-30BV/h according to the volume of the adsorption tower, and the lithium ions adsorbed in the manganese series lithium ion sieve adsorbent are eluted into the eluent. The specific space velocity can be selected according to the process requirements and equipment.

In the process of adopting the adsorption tower group, the eluent in the eluent storage tank can pass through the adsorption tower filled with the manganese-based lithium ion sieve adsorbent at the space velocity of 5-30BV/h in a one-time flowing/circulating flowing mode, and the lithium ions adsorbed on the adsorbent are eluted into the lithium ion eluent. In the working condition of one-time flowing, the eluent only flows through the adsorbent once and then flows back to the eluent storage tank 4. In the working condition of circulating flow, the eluent flows through the adsorption tower and the eluent storage tank for multiple times for 0.1-5 hours; and after the working condition is finished, opening a drain valve, discharging the eluent in the adsorption tower 1, and pumping the eluent into an eluent storage tank. The direction of the arrow between the adsorption tower and the eluent storage tank in the attached figure 1 shows the unidirectional flowing direction of the eluent in the adsorption tower and the eluent storage tank.

S04: and the M eluent storage tanks are internally provided with stirring paddles for stirring the analytic liquid, the pH meter is used for detecting the pH value of the analytic liquid, and the control center is used for controlling the eluent adjusting storage tanks to inject the adjusting agent into the eluent storage tanks according to the detection result so as to enable the pH value of the analytic liquid to reach the threshold value.

Stirring is needed after each circulation of the eluent storage tank and the adsorption tower is completed, so that the analytic solution is uniformly mixed, and the stirring time can be 0.05-1 hour; the pH meter reading is then taken. According to the reading of the pH meter, the control center automatically calculates the volume of the required replenishing concentrated eluent, automatically sends instructions to relevant valves and pumps, and pumps the concentrated eluent into the eluent storage tank 4 through the eluent adjusting storage tank 5. Subsequently, the eluent storage tank 4 uniformly mixes the starting stirring paddle with the eluent for 0.05 to 1 hour. The direction of the arrow between the eluent regulating storage tank and the eluent storage tank in the attached figure 1 represents the unidirectional flowing direction of the eluent in the eluent regulating storage tank and the eluent storage tank.

S05: and repeating the steps S03-S04X times, and then repeating the step S03 to obtain the analysis solution in the eluent storage tank, wherein the lithium ion concentration in the obtained analysis solution is 1g/L-10 g/L. Concentrating the analysis solution to obtain a lithium-containing solution; x is an integer greater than 0.

S06: and cleaning liquid enters a waste liquid tank through N adsorption towers respectively to clean the eluent in the adsorption towers.

The cleaning solution in this step may be the same as that in step S02, and may be, but is not limited to, deionized water or distilled water or filtered river water, and the purpose of cleaning is to remove the eluent in the manganese-based lithium ion sieve adsorbent. As described above, since the eluent is an acidic solution and remains in the manganese-based lithium ion sieve adsorbent for a long time, the manganese-based lithium ion sieve adsorbent is damaged, and the service life of the manganese-based lithium ion sieve adsorbent is further affected, it is necessary to clean the manganese-based lithium ion sieve adsorbent in time to ensure the replacement effect of the manganese-based lithium ion sieve adsorbent on lithium ions.

When the filtered river water is adopted for cleaning in the step, the river water is river water close to fresh water and basically does not contain other impurity ions, and the filtered river water is similar to deionized water and only plays a role in flushing the manganese-based lithium ion sieve adsorbent.

In the actual process, according to the volume of the manganese-based lithium ion sieve adsorbent, the cleaning agent can pass through the adsorption tower at the space velocity of 5-30BV/h, and the retention time of the cleaning agent in the adsorption tower is 0.05-10 hours, so that the eluent in the manganese-based lithium ion sieve adsorbent is sufficiently removed. The specific space velocity and residence time may be selected according to the process requirements and equipment.

Compared with a solar pond method, the method can shorten the production period of extracting lithium from salt lake brine from year to hour, and greatly improves the production efficiency; compared with an aluminum adsorption method, the method reduces the pretreatment of salt lake brine and the concentration process treatment of the extracting solution, and greatly reduces the production cost of the lithium extraction process; in addition, the method can be normally used at the temperature of minus 20 ℃, and is suitable for the low-temperature environment of high-altitude areas; the method has simple process and easy operation, and is particularly suitable for areas with relatively poor industrial foundations such as Qinghai Tibet and the like; the finally obtained desorption solution has high lithium content, simplifies the subsequent concentration process and greatly reduces the production cost.

The above description is only a preferred embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, so that all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be included in the scope of the appended claims.