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1.发明公开公开(公告)号：US20240026494A1
公开(公告)日：2024-01-25
申请号：US18255166
申请日：2021-12-09
发明人： Suidang LI , Hudao YAN , Jia YU , Lili FAN , Fumin GUO , Junlin GAO , Weiqiang LYU , Yuyun WEI , Qiong LIU , Xiaokang KOU
摘要： A method for recovering lithium from a lithium precipitation mother liquor, the method using the following cycle steps including adsorption, displacement, desorption and transformation: a. mounting a lithium-sodium separation resin in a resin column, and adding the lithium precipitation mother liquor to the resin column for adsorption, wherein the adsorption rate can reach 90% or more; b. after adsorption, washing the resin with water, displacing the resin with a lithium-salt-containing solution to wash out residual sodium from the resin; c. after displacement, desorbing the resin by means of an acid solution to obtain a solution with a high lithium content and a low sodium content, which solution has passed desorption criteria; and d. after desorption, carrying out reverse transformation on the resin by means of a transformation solution in order to ensure that no bubbles appear and then reduce the adsorption effect during the adsorption process. During the cycle, the lithium in the lithium precipitation mother liquor is separated from the solution with a high lithium-to-sodium ratio to obtain the solution with the high lithium-to-sodium ratio.
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公开(公告)号：US20240218483A1
公开(公告)日：2024-07-04
申请号：US18556060
申请日：2022-08-09
发明人： Suidang LI , Xiaokang KOU , Fumin GUO , Jia YU , Wenjin GAO , Lili FAN , Kaile CHU , Weina BIAN , Yao WANG , Peng XIANG , Qiong LIU
摘要： The present application discloses a lithium extraction method for an alkaline solution, in which a lithium adsorption material is used in an alkaline environment. Lithium ions in the alkaline solution are adsorbed, the lithium adsorption material is replaced with an alkaline high-lithium low-impurity solution, and then an acid solution is used for desorption, so that a high-lithium salt solution having higher lithium content can be obtained. Lithium concentration can reach 5 g/L or more, and the high-lithium salt solution can enter a bipolar membrane system for electrolysis, thereby preparing an alkaline high-lithium low-impurity solution and an acid solution for replacement and desorption of the lithium adsorption material. In the method provided by the present application, lithium in an alkaline solution is adsorbed by resin, and the lithium is preliminarily separated from sodium and potassium. Then, the sodium and the potassium are gradually removed from the resin according to the difference of the retention characteristics of the lithium, the sodium and the potassium on the resin, so that the function of lithium purification is achieved, and lithium concentration is ensured.
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公开(公告)号：US20230017362A1
公开(公告)日：2023-01-19
申请号：US17792624
申请日：2020-12-16
发明人： Jia YU , Fumin GUO , Suidang LI , Qiong LIU , Xiaokang KOU
IPC分类号： C22B26/12 , C01D15/00 , B01J39/04 , B01J39/18 , B01J47/02 , B01J49/60 , B01J49/53 , C22B3/42
摘要： Disclosed is a new continuous lithium-sodium separation method. A lithium-sodium separation mother solution, a first leacheate, a desorption solution, a second leacheate and a lithium-sodium separation adsorption tail solution respectively pass through a lithium-sodium separation mother solution feeding pipe (2), a first leacheate feeding pipe (3), a desorption solution feeding pipe (4), a second leacheate feeding pipe (5) and an adsorption tail solution top desorption solution feeding pipe (6) that are located above and below a rotary disc of a multi-way change-over valve system (1), respectively enter corresponding resin columns (7) by means of pore channels and channels in the multi-way change-over valve system (1), and then are discharged from an adsorption tail solution discharging pipe (8), a first leacheate discharging pipe (9), a qualified liquid discharging pipe (10), a second leacheate discharging pipe (11) and an adsorption tail solution top desorption solution discharging pipe (12), so as to complete the whole technological process, wherein the resin columns (7) are connected in series or in parallel by means of the channels located in the multi-way change-over valve system (1). The method is simple and easy to operate, the resin utilization rate is improved by 20% or more, the efficiency is improved by 40% or more, and the production cost can be reduced by 30-50%. The production reliability is improved, and all-year continuous operation can be realized.
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公开(公告)号：US20240183002A1
公开(公告)日：2024-06-06
申请号：US18563129
申请日：2022-08-12
发明人： Suidang LI , Fumin GUO , Wenjin GAO , Pengwei JIAO , Qiong LIU , Jia YU , Weina BIAN , Kaile CHU , Yao WANG , Xiaokang KOU
CPC分类号： C22B3/24 , B01J20/183 , B01J20/28026 , B01J20/3071 , B01J20/3078
摘要： A method for lithium adsorption in a carbonate- and/or sulfate-containing solution, comprising using an aluminum-based lithium adsorbent for adsorption of lithium ions in the carbonate- and/or sulfate-containing solution, after the adsorption is saturated, using a weakly acidic high-concentration salt solution to transform the adsorbent, desorbing the transformed adsorbent by means of a low-concentration salt solution or water, and entering the next cycle for operation.
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公开(公告)号：US20230002854A1
公开(公告)日：2023-01-05
申请号：US17778776
申请日：2020-12-16
发明人： Jia YU , Zengrong LI , Dayi ZHANG , Fumin GUO , Zhaofei HOU , Faman TANG , Mian WANG , Zhibo LUO , Chao ZAN , Suidang LI , Qiong LIU , Yongxiao SONG , Yun WANG , Xiaokang KOU
摘要： A new method for extracting lithium from salt lake brine, comprising the following steps: a salt lake old brine raw material, desorption liquid, low-magnesium water, and adsorption tail liquid pass through an old brine feeding pipe (2), a desorption liquid feeding pipe (4), a low-magnesium water top desorption liquid feeding pipe (3), and an adsorption tail liquid top desorption liquid feeding pipe (11), respectively, which are located above and below a rotary disc of a multi-way valve system (1); and after respectively entering corresponding adsorption columns (6) by means of a duct and channel within the multi-way valve system (1), the entire process procedure is completed from an adsorption tail liquid discharge pipe (7), a qualified desorption liquid discharge pipe (10), a lithium-containing old brine discharge pipe (8), and an adsorption tail liquid top desorption liquid discharge pipe (5); and the adsorption columns (6) are connected in series or in parallel by means of channels located in the multi-way valve system (1). The feature in which a multi-way valve device is simple and easy to operate is utilized, and in comparison with a fixed bed operating system, the utilization rate of lithium adsorbent may be increased by over 20%, the utilization efficiency of the lithium adsorbent may be increased by over 40%, and production costs may be reduced by 30-50%. Therefore, the stability of a qualified desorption liquid is improved, stable production is guaranteed, and year-round constant operation may be achieved.
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