CN108854996A - A kind of aluminum salt adsorbent and its purposes in lithium is proposed in salt lake bittern - Google Patents
A kind of aluminum salt adsorbent and its purposes in lithium is proposed in salt lake bittern Download PDFInfo
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Abstract
The purposes in lithium is proposed the present invention relates to a kind of aluminum salt adsorbent and its in salt lake bittern, belongs to lithium resource extractive technique field.Present invention employs aluminium hydroxides as adsorbent, while using the macroreticular resin Jing Guo modification as carrier.For the adsorbent to the adsorbing separation of lithium suitable for the lithium water of salt lake, above-mentioned catalyst has the advantages that high adsorption capacity, low molten loss rate.
Description
Technical field
The purposes in lithium is proposed the present invention relates to a kind of aluminum salt adsorbent and its in salt lake bittern, belongs to lithium resource extractive technique
Field.
Background technique
Lithium is the most light the smallest alkali metal of metal and radius being currently known.It is important one of the rare metal in China,
It is widely used in many fields such as new energy, atomic energy industry, chemical industry space flight.Since its compound of lithium has extensively in many fields
Application, lithium come source problem more and more attention has been paid to.Salt lake bittern is considered as the following important source.Li in brine+Often
It is coexisted in the form of micro with a large amount of alkali metal, alkaline-earth metal ions.Since the very close of their chemical property makes therefrom
Separation and Extraction lithium is very difficult.Mostly lithium is extracted from brine in the form of lithium carbonate, lithium chloride in the world at present, is adopted
Technology mainly has solvent method, the precipitation method and absorption method etc..Salt lake bittern resource due to China containing lithium is mostly high Mg/Li ratio
Brine, the Mg of high-content2+Presence make separate Li+Technology it is increasingly complex, there is no foreign technology that can use for reference at present, become
Brine proposes the technical bottleneck of lithium.Absorption method has the characteristics that selectivity is high, can handle low concentration brine, clean manufacturing can be achieved,
And simple process, the rate of recovery are high, from economical and environmentally friendly angle consider to have than other methods Hao biggish advantage, especially suitable for
Lithium is mentioned from low-grade seawater or salt lake saline.
Lithium adsorbent mainly includes organic adsorbent and inorganic adsorbent, wherein organic adsorbent because of high cost and
The harm of environment is applied less.Studying at present more is inorganic adsorbent, and inorganic adsorbent is to Li+There is good selectivity
And sieve effect, adsorption effect are good, easy to operate.Inorganic adsorbent mainly includes aluminium base adsorbent, layered ion exchange adsorbing substance,
Titanium-based, antimony base and manganese base adsorbent.
It is to mention what lithium developed by the aluminium salt precipitation method that aluminium salt, which mentions lithium as lithium ion sieve,.Aluminum salt adsorbent is typically expressed as
LiX·2Al(OH)3·nH2O, wherein X is represented anion (such as Cl- and Br-), and n is crystallization water number.With eluent by structure
In Li+ wash off after, the inorganic ions sieve with regular gap structure can be obtained, this gap structure is to target Li+Have
It is highly selective.It is adsorbed and the mechanism of desorption is as follows：
LiX·2Al(OH)3·nH2O+H2O≒xLiX+(1-x)LiX·2Al(OH)3·(n+1)H2O
During adsorbing lithium, Li+ preferentially enters stratiform Al (OH) because of size matching 3Octahedral voids position, remaining radius
Biggish alkalies and alkaline earth ion cannot be adsorbed because of space steric effect into duct.By Al (OH) 3It is pressed with LiOH
Solution is made in certain proportion, dilute HCl is added after reacting a period of time, the pH value for adjusting solution is maintained at 5~7,3~5 h of pickling
Mixture washing is removed into LiCl therein afterwards, the A1 (OH) containing specific hole can be obtained 3Crystallize lithium ion sieve.Adsorption experiment
Show as n (A1 (OH) 3)/n (LiOH)=2.0, pickling time is 3~4 h, when pH=5.8, Al (OH) 3Lithium ion sieve is to Li+
Adsorbance up to 0.6~0.9 mgg-1, and stable structure.
The preparation of aluminium base adsorbent is convenient, and selectivity is high, and stability is good, long service life, is very promising lithium
Adsorbent.But for the material developed at present generally in powdery, permeability and mobility are poor, and molten loss rate is larger when exchange.
Summary of the invention
The purpose of the present invention is：A kind of adsorbent mentioned during lithium applied to salt lake brines is provided, using by being modified
The macroreticular resin of processing as carrier, while to the surface of aluminium hydroxide carry out it is coupling agent modified, improve it in resin surface
Load capacity, dispersibility and reduce molten loss rate.
Technical solution is：
A kind of aluminum salt adsorbent, preparation method include the following steps：
Step 1, the preparation of aluminium hydroxide：Prepare the water of the lithium chloride of nine water aluminum nitrates and 1~2mol/L containing 2~5mol/L
Solution is added urea and is reacted, and after reaction, gained gel is washed with deionized after centrifuge separation, then passes through
Centrifugation is crossed, the gel aluminum hydroxide of embedding lithium is obtained；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, then is added dropwise silane coupled
The ethanol solution of agent is reacted, and after reaction, is washed with deionized after product is centrifugated out, using centrifugation,
After vacuum drying, modified aluminium hydroxide is obtained；
Step 3, the load molding of adsorbent：By weight, 0.2~0.4 part of initiator is added to 110~120 parts and is gone
In ionized water, and it is warming up to 40~50 DEG C；In indifferent gas gas, 10~14 parts, 6~8 parts benzene second of modified aluminium hydroxide are added
Alkene, 4~6 parts of crosslinking agent divinylbenzenes, 14~15 parts of pore-foaming agent toluene, 1.5~2 parts of watersoluble modified dose of hydroxyethyl methacrylate second
Ester, 0.5~1 part of dispersing agent and high speed dispersion are uniform, then temperature reaction；After product centrifugation, with ethanol washing, and vacuum is dried
It is dry, it obtains loading molding adsorbent.
In the step 1, the molar ratio 8~12: 1 of urea and aluminum nitrate, the reaction time is 2~4h, and reaction temperature is
20~40 DEG C.
In the step 2, silane coupling agent is γ-(methacryloxypropyl) propyl trimethoxy silicane；It is silane coupled
The concentration of the ethanol solution of agent is 5~10wt%；Gel aluminum hydroxide, ethanol water, the ethyl alcohol of silane coupling agent of embedding lithium are molten
The weight ratio of liquid is 1：8~12：5~10；It is added dropwise rear 2~3h of reaction time, 25~35 DEG C of reaction temperature.
In the step 3, initiator is dibenzoyl peroxide；Dispersing agent is SPAN 80；Temperature reaction is 70~75
DEG C reaction 2~4h.
In the step 2, titanium oxide sol also is added when the gel aluminum hydroxide of embedding lithium is mixed with ethanol water,
The additional amount of titanium oxide sol is the 10~16% of the gel aluminum hydroxide weight of embedding lithium.
Above-mentioned aluminum salt adsorbent proposes the purposes in lithium in salt lake bittern.
The purposes, the Mg in salt lake bittern2+With Li+Weight ratio be 280~1: 1, brine contain Li+Concentration 0.01
~15g/L.
Beneficial effect
Aluminum salt adsorbent prepared by the present invention uses macroreticular resin as carrier, when preparing aluminium hydroxide, due to hydroxide
The surface of aluminium has more hydroxyl, can be by cross-linking reaction grafted silane coupling agent, due in polar solvent, hydroxide
The more hydroxyl in the surface of aluminium will lead to the reunion of particle, and after passing through grafting, efficiently reduce the particle of aluminium hydroxide
Size；Meanwhile another effect of silane coupling agent is effectively to be fixed aluminium hydroxide adsorbent by cross-linking reaction
In on macroreticular resin, reducing molten loss rate；In addition, hydrophilic modifying monomer is added, suction can be improved in the preparation of macroreticular resin
Attached dose is used for multiple times the service life, reduces the pollution of the pollutant in brine；During the preparation process, titanium oxide sol being added can lead to
It crosses degradation and mitigates influence of the halogen organic pollutants to adsorbent service life.
Detailed description of the invention
Fig. 1 is the SEM photograph of modified aluminium hydroxide prepared by the present invention.
Fig. 2 is the infrared spectrogram of adsorbent prepared by the present invention.
Fig. 3 is the comparison diagram of adsorbent adsorbance rate of descent.
Specific embodiment
Embodiment 1
Aluminum salt adsorbent preparation method：
Step 1, the preparation of aluminium hydroxide：The aqueous solution of the lithium chloride of nine water aluminum nitrates and 1mol/L containing 2mol/L is prepared,
The molar ratio 8: 1 that urea carries out reaction urea and aluminum nitrate is added, the reaction time is 2h, and reaction temperature is 20 DEG C, and reaction terminates
Afterwards, gained gel is washed with deionized after centrifuge separation, using centrifugation, obtains the gel aluminum hydroxide of embedding lithium；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, then 5wt% γ-is added dropwise
The ethanol solution of (methacryloxypropyl) propyl trimethoxy silicane is reacted, and gel aluminum hydroxide, the ethyl alcohol of embedding lithium are water-soluble
Liquid, silane coupling agent the weight ratio of ethanol solution be 1：8：5, reaction time 2h, 25 DEG C of reaction temperature, after reaction, will
Product is washed with deionized after being centrifugated out, using centrifugation, after vacuum drying, obtains modified aluminium hydroxide；
Step 3, the load molding of adsorbent：By weight, 0.2 part of initiator dibenzoyl peroxide is added to 110
In part deionized water, and it is warming up to 40 DEG C；In indifferent gas gas, 10 parts, 6 parts styrene of modified aluminium hydroxide, 4 parts of friendships are added
Join agent divinylbenzene, 14 parts of pore-foaming agent toluene, 1.5 parts of watersoluble modified dose of hydroxyethyl methacrylates, 0.5 part of dispersing agent SPAN
80 and high speed dispersion it is uniform, then temperature reaction；70 DEG C of reaction 2h, after product centrifugation, with ethanol washing, and vacuum drying, it obtains
To the molding adsorbent of load.
Embodiment 2
Aluminum salt adsorbent preparation method：
Step 1, the preparation of aluminium hydroxide：The aqueous solution of the lithium chloride of nine water aluminum nitrates and 2mol/L containing 5mol/L is prepared,
The molar ratio 12: 1 that urea carries out reaction urea and aluminum nitrate is added, the reaction time is 4h, and reaction temperature is 40 DEG C, and reaction terminates
Afterwards, gained gel is washed with deionized after centrifuge separation, using centrifugation, obtains the gel aluminum hydroxide of embedding lithium；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, then 10wt% γ-is added dropwise
The ethanol solution of (methacryloxypropyl) propyl trimethoxy silicane is reacted, and gel aluminum hydroxide, the ethyl alcohol of embedding lithium are water-soluble
Liquid, silane coupling agent the weight ratio of ethanol solution be 1： 12：10,3h when reaction, 35 DEG C of reaction temperature, after reaction,
It is washed with deionized after product is centrifugated out, using centrifugation, after vacuum drying, obtains modified aluminium hydroxide；
Step 3, the load molding of adsorbent：By weight, 0.4 part of initiator dibenzoyl peroxide is added to 120
In part deionized water, and it is warming up to 50 DEG C；In indifferent gas gas, 14 parts, 8 parts styrene of modified aluminium hydroxide, 6 parts of friendships are added
Join agent divinylbenzene, 15 parts of pore-foaming agent toluene, 2 parts of watersoluble modified dose of hydroxyethyl methacrylates, 1 part of dispersing agent SPAN 80 simultaneously
High speed dispersion is uniform, then temperature reaction；75 DEG C of reaction 4h, after product centrifugation, with ethanol washing, and vacuum drying, it is born
Carry molding adsorbent.
Embodiment 3
Aluminum salt adsorbent preparation method：
Step 1, the preparation of aluminium hydroxide：The aqueous solution of the lithium chloride of nine water aluminum nitrates and 2mol/L containing 4mol/L is prepared,
The molar ratio 10: 1 that urea carries out reaction urea and aluminum nitrate is added, the reaction time is 3h, and reaction temperature is 30 DEG C, and reaction terminates
Afterwards, gained gel is washed with deionized after centrifuge separation, using centrifugation, obtains the gel aluminum hydroxide of embedding lithium；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, then 5wt% γ-is added dropwise
The ethanol solution of (methacryloxypropyl) propyl trimethoxy silicane is reacted, and gel aluminum hydroxide, the ethyl alcohol of embedding lithium are water-soluble
Liquid, silane coupling agent the weight ratio of ethanol solution be 1：10：7, reaction time 2h, 30 DEG C of reaction temperature, after reaction, will
Product is washed with deionized after being centrifugated out, using centrifugation, after vacuum drying, obtains modified aluminium hydroxide；
Step 3, the load molding of adsorbent：By weight, 0.3 part of initiator dibenzoyl peroxide is added to 115
In part deionized water, and it is warming up to 45 DEG C；In indifferent gas gas, 12 parts, 7 parts styrene of modified aluminium hydroxide, 5 parts of friendships are added
Join agent divinylbenzene, 14 parts of pore-foaming agent toluene, 1.7 parts of watersoluble modified dose of hydroxyethyl methacrylates, 0.7 part of dispersing agent SPAN
80 and high speed dispersion it is uniform, then temperature reaction；72 DEG C of reaction 3h, after product centrifugation, with ethanol washing, and vacuum drying, it obtains
To the molding adsorbent of load.
Embodiment 4
Aluminum salt adsorbent preparation method：
Step 1, the preparation of aluminium hydroxide：The aqueous solution of the lithium chloride of nine water aluminum nitrates and 2mol/L containing 4mol/L is prepared,
The molar ratio 10: 1 that urea carries out reaction urea and aluminum nitrate is added, the reaction time is 3h, and reaction temperature is 30 DEG C, and reaction terminates
Afterwards, gained gel is washed with deionized after centrifuge separation, using centrifugation, obtains the gel aluminum hydroxide of embedding lithium；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, titanium oxide sol, then is dripped
The ethanol solution of 5wt% γ-(methacryloxypropyl) propyl trimethoxy silicane is added to be reacted, the gel aluminum hydroxide of embedding lithium,
Ethanol water, silane coupling agent the weight ratio of ethanol solution be 1：10：7, the additional amount of titanium oxide sol is the hydrogen of embedding lithium
The 10~16% of alumina gel weight, reaction time 2h, 30 DEG C of reaction temperature, after reaction, after product is centrifugated out
It is washed with deionized, using centrifugation, after vacuum drying, obtains modified aluminium hydroxide；
Step 3, the load molding of adsorbent：By weight, 0.3 part of initiator dibenzoyl peroxide is added to 115
In part deionized water, and it is warming up to 45 DEG C；In indifferent gas gas, 12 parts, 7 parts styrene of modified aluminium hydroxide, 5 parts of friendships are added
Join agent divinylbenzene, 14 parts of pore-foaming agent toluene, 1.7 parts of watersoluble modified dose of hydroxyethyl methacrylates, 0.7 part of dispersing agent SPAN
80 and high speed dispersion it is uniform, then temperature reaction；72 DEG C of reaction 3h, after product centrifugation, with ethanol washing, and vacuum drying, it obtains
To the molding adsorbent of load.
Comparative example 1
Difference with embodiment 3 is：Silane coupling agent graft modification is not used to aluminium hydroxide.
Aluminum salt adsorbent preparation method：
Step 1, the preparation of aluminium hydroxide：The aqueous solution of the lithium chloride of nine water aluminum nitrates and 2mol/L containing 4mol/L is prepared,
The molar ratio 10: 1 that urea carries out reaction urea and aluminum nitrate is added, the reaction time is 3h, and reaction temperature is 30 DEG C, and reaction terminates
Afterwards, gained gel is washed with deionized after centrifuge separation, using centrifugation, obtains the gel aluminum hydroxide of embedding lithium,
After vacuum drying, the aluminium hydroxide of embedding lithium is obtained；
Step 2, the load molding of adsorbent：By weight, 0.3 part of initiator dibenzoyl peroxide is added to 115
In part deionized water, and it is warming up to 45 DEG C；In indifferent gas gas, 12 parts, 7 parts benzene second of gel aluminum hydroxide of embedding lithium are added
Alkene, 5 parts of crosslinking agent divinylbenzenes, 14 parts of pore-foaming agent toluene, 1.7 parts of watersoluble modified dose of hydroxyethyl methacrylates, 0.7 part of dispersion
Simultaneously high speed dispersion is uniform by agent SPAN 80, then temperature reaction；72 DEG C of reaction 3h, after product centrifugation, with ethanol washing, and vacuum
Drying, obtains loading molding adsorbent.
Comparative example 2
Difference with embodiment 3 is：Hydrophilic modifying monomer is added not in the preparation of resin.
Aluminum salt adsorbent preparation method：
Step 1, the preparation of aluminium hydroxide：The aqueous solution of the lithium chloride of nine water aluminum nitrates and 2mol/L containing 4mol/L is prepared,
The molar ratio 10: 1 that urea carries out reaction urea and aluminum nitrate is added, the reaction time is 3h, and reaction temperature is 30 DEG C, and reaction terminates
Afterwards, gained gel is washed with deionized after centrifuge separation, using centrifugation, obtains the gel aluminum hydroxide of embedding lithium；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, then 5wt% γ-is added dropwise
The ethanol solution of (methacryloxypropyl) propyl trimethoxy silicane is reacted, and gel aluminum hydroxide, the ethyl alcohol of embedding lithium are water-soluble
Liquid, silane coupling agent the weight ratio of ethanol solution be 1：10：7, reaction time 2h, 30 DEG C of reaction temperature, after reaction, will
Product is washed with deionized after being centrifugated out, using centrifugation, after vacuum drying, obtains modified aluminium hydroxide；
Step 3, the load molding of adsorbent：By weight, 0.3 part of initiator dibenzoyl peroxide is added to 115
In part deionized water, and it is warming up to 45 DEG C；In indifferent gas gas, 12 parts, 7 parts styrene of modified aluminium hydroxide, 5 parts of friendships are added
It is uniform to join agent divinylbenzene, 14 parts of pore-foaming agent toluene, 0.7 part of dispersing agent SPAN 80 and high speed dispersion, then temperature reaction；72
DEG C reaction 3h, after product centrifugation, with ethanol washing, and vacuum drying, it obtains loading molding adsorbent.
Comparative example 3
Using the method for preparing aluminum salt adsorbent in the prior art.
It weighs Al (OH)3It is mixed with LiOH with water, dilute hydrochloric acid is added after a certain period of time and stirs for reaction, makes mixture upper layer
Clear liquid pH value is maintained between 5~7, obtains adsorbent.
The characterization of adsorbent
The SEM photograph for the modified aluminium hydroxide being prepared in embodiment 3 is as shown in Figure 1, it can be seen that prepared by the present invention to change
Property adsorbent has the advantages that partial size is small, uniformity is good.
The infared spectrum for the adsorbent being prepared in above embodiments 3 is as shown in Fig. 2, in 1298.1cm-1Place be in not
Saturated polyester-C=C-COOR absorption peak, illustrates that hydrophilic monomer is successfully modified resin；In 2914.4 cm-1Place
With 2846.7 cm-1Place, is the c h bond stretching vibration absworption peak of phenyl ring, 1743.2cm-1Place be and c h bond on phenyl ring it is curved
Bent vibration peak illustrates the presence of styrene.
The pretreatment of adsorbent
Adsorbent prepared by above embodiments and reference examples is loaded in adsorption column, and with after the HCl of pH5~6 elution 12h,
LiCl therein is removed, the Al (OH) containing specific hole is obtained3Adsorbent.
Adsorbent Static Adsorption Li+Test
Suitable LiCl is dissolved in deionized water, makes Li therein+Concentration is 1000mg/L, as simulation brine feed liquid.Again
Adsorbent 300g is added into 4L brine, 8h is adsorbed at 25 DEG C, with its Li of Atomic Absorption Spectrometry+Concentration calculates absorption
Amount.
Calculation formula is as follows：
Qt=(C0-Ct)×V/m
Wherein Qt is t moment Li+Adsorption capacity；C0 and Ct is respectively Li of the solution initially with absorption t moment+Concentration, V are molten
The volume of liquid；M is the weight of adsorbent.Adsorbance is as shown in the table：
As can be seen from the table, adsorbent provided by the invention has preferable absorption Li+Effect.By embodiment 3 and right
Ratio 1 can preferably improve point of aluminium hydroxide as can be seen that the surface of aluminium hydroxide using after silane coupler modified
Property is dissipated, adsorbance is made to be improved significantly；Embodiment 3 and comparative example 3 are as can be seen that the absorption of adsorbent provided by the invention is held
Amount is significantly greater than the aluminium hydroxide adsorbent of direct precipitation method preparation in the prior art.
The absorption of mixed inorganic salt solution
Lithium ion is often coexisted in the form of micro with a large amount of alkali metal, alkaline-earth metal ions in brine, and wherein content is higher is
Magnesium ion exists simultaneously micro sodium, potassium ion.Dissolve suitable LiCl, MgCl2, NaCl, KCl in deionized water, make it
In Li+、Mg2+、Na+、K+Concentration is respectively 1000mg/L as simulation brine, investigates other metal ions to performance of the adsorbent
Influence.Adsorbent 300g is added into 4L brine, 8h is adsorbed at 25 DEG C, then adsorbent is centrifugated, uses 4LpH5 respectively
~6 HCl desorption processing, calculates the ion concentration in stripping liquid, and calculate separation factor α.
As can be seen that adsorbent prepared by the present invention has the selection separation property preferably to other cations.
The molten loss rate of adsorbent is tested
Brine is after natural evaporation is concentrated, wherein Mg2+Concentration is 132.1g/L, Li+Concentration is 2.3g/L, Na+Concentration is 2.2g/
L、B+Concentration is 2.3g/L, SO4 2-Concentration is 33.1g/L, COD 190.9mg/L, will be prepared in above embodiments and comparative example
Adsorbent be loaded in adsorption column, pillar height 30cm, diameter 2.5cm are first pumped into concentration from column bottom using the flow velocity of 150ml/h
Brine is pumped into using deionized water from the flow velocity of bottom 150ml/h after adsorbing 4h, desorbs 4h, adsorbent is poured out, and vacuum is dry
After dry, weigh, and calculate molten loss rate.
L%=(m0-m1)/m0×100%；
Wherein, m0It is initial adsorbent charge weight, m1It is the adsorbent charge weight after test.
After 15 times, the molten loss rate of above-mentioned adsorbent is as follows：
As can be seen from the above table, adsorbent provided by the invention has lower molten loss rate；Pass through embodiment 3 and comparative example 1
As can be seen that it can be improved in the fixation of resin surface, reduces molten damage using after silane coupled modification to aluminium hydroxide
Rate.
Brine absorption proposes lithium test
Contain Mg in brine2+ 132.1g/L、Li+2.3g/L, COD 190.9mg/L are separately added into the above reality into 4L brine
Apply example and comparative example preparation adsorbent 300g, 500W xenon lamp irradiation under after 25 DEG C of absorption 4h, adsorbent is filtered out, dispersion
Desorption processing is carried out in the hydrochloric acid of 2.0L 0.2mol/L, desorption time 4h, again will after the completion of desorption by 30 DEG C of desorption temperature
Adsorbent centrifuge separation is handled with the HCl desorption of 4LpH5~6 respectively, calculates the adsorbance of adsorbent, lay equal stress on to relapse and echo solution
It is drawn through journey 10 times, investigates the service life of adsorbent.
As can be seen from the above table, adsorbent provided by the invention has preferable adsorption effect in true brine；It is logical
Cross embodiment 3 and embodiment 4 comparison can be seen that by using hydrophilic monomer graft modification is carried out to resin after, for
Brine containing COD has preferable resistant to pollution effect, and adsorbance is higher.
As can be seen from the above table, adsorbent provided by the invention there is preferable use to follow brine adsorption process
Ring number.
Claims (7)
1. a kind of aluminum salt adsorbent, which is characterized in that preparation method includes the following steps：
Step 1, the preparation of aluminium hydroxide：Prepare the water of the lithium chloride of nine water aluminum nitrates and 1~2mol/L containing 2~5mol/L
Solution is added urea and is reacted, and after reaction, gained gel is washed with deionized after centrifuge separation, then passes through
Centrifugation is crossed, the gel aluminum hydroxide of embedding lithium is obtained；
Step 2, the modification of aluminium hydroxide：The gel aluminum hydroxide of embedding lithium is mixed with ethanol water, then is added dropwise silane coupled
The ethanol solution of agent is reacted, and after reaction, is washed with deionized after product is centrifugated out, using centrifugation,
After vacuum drying, modified aluminium hydroxide is obtained；
Step 3, the load molding of adsorbent：By weight, 0.2~0.4 part of initiator is added to 110~120 parts and is gone
In ionized water, and it is warming up to 40~50 DEG C；In indifferent gas gas, 10~14 parts, 6~8 parts benzene second of modified aluminium hydroxide are added
Alkene, 4~6 parts of crosslinking agent divinylbenzenes, 14~15 parts of pore-foaming agent toluene, 1.5~2 parts of watersoluble modified dose of hydroxyethyl methacrylate second
Ester, 0.5~1 part of dispersing agent and high speed dispersion are uniform, then temperature reaction；After product centrifugation, with ethanol washing, and vacuum is dried
It is dry, it obtains loading molding adsorbent.
2. aluminum salt adsorbent according to claim 1, which is characterized in that in the step 1, urea and aluminum nitrate rub
That ratio 8~12: 1, the reaction time is 2~4h, and reaction temperature is 20~40 DEG C.
3. aluminum salt adsorbent according to claim 1, which is characterized in that in the step 2, silane coupling agent is γ-
(methacryloxypropyl) propyl trimethoxy silicane；The concentration of the ethanol solution of silane coupling agent is 5~10wt%；The hydrogen of embedding lithium
Alumina gel, ethanol water, silane coupling agent the weight ratio of ethanol solution be 1：8~12：5~10；After being added dropwise
2~3h of reaction time, 25~35 DEG C of reaction temperature.
4. aluminum salt adsorbent according to claim 1, which is characterized in that in the step 3, initiator is peroxidating two
Benzoyl；Dispersing agent is SPAN 80；Temperature reaction is 70~75 DEG C of 2~4h of reaction.
5. aluminum salt adsorbent according to claim 1, which is characterized in that the hydroxide in the step 2, also in embedding lithium
Titanium oxide sol is added when alumina gel is mixed with ethanol water, the additional amount of titanium oxide sol is the gel aluminum hydroxide of embedding lithium
The 10~16% of weight.
6. the described in any item aluminum salt adsorbents of Claims 1 to 5 propose the purposes in lithium in salt lake bittern.
7. purposes according to claim 6, which is characterized in that the Mg in salt lake bittern2+With Li+Weight ratio be 280~1
: 1, brine contains Li+0.01~15g/L of concentration.
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