CN109485079A - A kind of method of lithium content in reduction alumina product - Google Patents

A kind of method of lithium content in reduction alumina product Download PDF

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Publication number
CN109485079A
CN109485079A CN201811609306.1A CN201811609306A CN109485079A CN 109485079 A CN109485079 A CN 109485079A CN 201811609306 A CN201811609306 A CN 201811609306A CN 109485079 A CN109485079 A CN 109485079A
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China
Prior art keywords
lithium
sodium aluminate
solution
aluminate solution
alumina
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CN201811609306.1A
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Inventor
齐利娟
韩东战
路晓涛
杨桂丽
韦舒耀
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Aluminum Corp of China Ltd
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Aluminum Corp of China Ltd
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Priority to CN201811609306.1A priority Critical patent/CN109485079A/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention discloses a kind of methods of lithium content in reduction alumina product, comprising: aluminum contained compound is added in the sodium aluminate solution containing lithium as adsorbent, adsorbs the lithium in sodium aluminate solution；By controlling solution reaction temperature, mixing time, the lithium in solution is promoted to be precipitated；It is filtered, obtains rich lithium filter cake and filtrate；Filtrate enters the subsequent handling for preparing alumina product.The removal efficiency of lithium is high in sodium aluminate solution, reaches as high as 97%, and simple process, does not generate pollution to sodium aluminate solution.

Description

A kind of method of lithium content in reduction alumina product
Technical field
The invention belongs to technical field of inorganic chemical industry, and in particular to a method of reduce lithium content in alumina product.
Background technique
In recent years, domestic bauxite resource gradually decreases, grade reduces, and many alumina producing enterprises have to using mine The high bauxite of object complicated composition, lithium content.In alumina producing Bayer process process, most lithium was being dissolved out in bauxite Journey enters in sodium aluminate solution, and what lithium content was high in the sperm after crude-liquid filtering reaches 0.06g/L, after analysed in decomposable process Aluminium hydroxide is entered out, is entered eventually into alumina product by roasting process, so that lithium in alumina product be caused to contain Amount increases.The high alumina product of lithium content is used for a long time as raw material in aluminium electroloysis enterprise, and lithium salt content constantly increases in electrolyte Add, lithium fluoride alreadys exceed 3% in many enterprise's electrolyte, and highest has reached 7% or more, causes serious shadow to electrolytic process It rings, for example electrolysis temperature reduces, burner hearth regularity deteriorates, electrolysis production stability reduces, current efficiency reduces, energy consumption increases Deng.Many experts and scholars gradually produce common recognition to this.Therefore, in alumina producing system, it is necessary to by sodium aluminate Lithium in solution is removed, to reduce the content of lithium in alumina product.
Summary of the invention
Aiming at the shortcomings of the prior art, the present invention provides a kind of side for reducing lithium content in alumina product Method.
The present invention is achieved by the following technical solutions.
A kind of method of lithium content in reduction alumina product, which is characterized in that the method step includes:
(1) aluminum contained compound is added in the sodium aluminate solution containing lithium as adsorbent, adsorbs the lithium in sodium aluminate solution；
(2) solution obtained through step (1) is stirred, by controlling solution reaction temperature, mixing time, is promoted in solution Lithium be precipitated；
(3) solution obtained through step (2) is filtered, obtains rich lithium filter cake and filtrate；
(4) filtrate obtained through step (3) enters the subsequent handling for preparing alumina product.
Further, aluminum contained compound is aluminium hydroxide, unformed aluminium hydroxide, active oxidation in the step (1) The mixing of one or more of aluminium, aluminium oxide dust collection powder.
Further, the activated alumina is the mixing of one or more of gama-alumina, ρ-aluminium oxide.
Further, the aluminium oxide dust collection powder be electricity gather dust, the mixing of one or more of bag collection.
Further, the additional amount of step (1) aluminum contained compound is 1~50g/L.
Further, the additional amount of step (1) aluminum contained compound is 5~30g/L.
Further, step (1) sodium aluminate solution is that Bayer process prepares the intermediate product during alumina product, The component and its concentration of sodium aluminate solution include: Na2Ok: 100~200g/L, Na2K:1.05~2.30 Oc:5~40g/L, α.
Further, 50~100 DEG C of reaction temperature of the step (2), 30~300min of mixing time.
Further, moisture content≤40% in the rich lithium filter cake that the step (3) obtains.
Further, the rich lithium filter cake that the step (3) obtains can be used as adsorbent and be added in sodium aluminate solution again Lithium is adsorbed, is recycled.
Advantageous effects of the invention: the present invention provides a kind of by reducing lithium content in sodium aluminate solution, and then drop The method of lithium content in al suboxide product, has following technical effect that
(1) adsorbent containing aluminium used is cheap and easy to get, from a wealth of sources, can be obtained by alumina producing substantially.
(2) removal efficiency of lithium is high in sodium aluminate solution, reaches as high as 97%, and simple process, does not generate to sodium aluminate solution Pollution.
(3) have the main distinction compared with existing salt lake proposes lithium technique: the environmental system in salt lake first is high halogen system, with The alkali system of aluminium oxide process is entirely different, and active aluminium hydroxide brings two problems, one side itself in alkali system Be dissolved, on the other hand itself can be used as seed, cause the decomposition of sodium aluminate solution, and salt lake mention lithium at all without the concern for These problems；And the lithium content in sodium aluminate solution is well below even two orders of magnitude of the lithium content one in salt lake, highly basic The de- lithium of absorption under system and the absorption under the conditions of salt lake take off lithium, and process conditions are entirely different.
Specific embodiment
The present invention is described in detail With reference to embodiment.
The method of lithium content, step include: in a kind of reduction alumina product
(1) 1~50g/L aluminum contained compound is added in the sodium aluminate solution containing lithium as adsorbent, it is preferable that 5~30g/L absorption Agent keeps the relatively stable of character in sodium aluminate solution, and adsorbent has stronger activity and biggish specific surface area, can be with Lithium in physical absorption sodium aluminate solution；Wherein, aluminum contained compound is aluminium hydroxide, unformed aluminium hydroxide, active oxidation The mixing of one or more of aluminium, aluminium oxide dust collection powder；Further, activated alumina is gama-alumina, in ρ-aluminium oxide One or more mixing；Further, aluminium oxide dust collection powder be electricity gather dust, the mixing of one or more of bag collection；The aluminium Acid sodium solution is using the bauxite containing lithium as raw material, and Bayer process prepares the intermediate product during alumina product, molten Most lithium enters in sodium aluminate solution in bauxite during out, and lithium content is up to 0.06g/L, the group of sodium aluminate solution Divide and its concentration includes: Na2Ok: 100~200g/L, Na2K:1.05~2.30 Oc:5~40g/L, α；
(2) solution obtained through step (1) is stirred, is dispersed in adsorbent in sodium aluminate solution, and pass through control 50~100 DEG C of reaction temperature processed, 30~300min of mixing time enables the lithium in solution sufficiently to adsorb on the sorbent, promotes Lithium in solution is precipitated；
(3) will be after 1~3h of solution left standstill that step (2) obtain, solution layering is obvious, is then filtered, and will contain lithiumation conjunction Object is separated from sodium aluminate solution, obtains rich lithium filter cake and filtrate；Moisture content≤40% in rich lithium filter cake；Rich lithium filter cake is on the one hand It can be dried, obtain product containing lithium, on the other hand since wet filter residue activity is higher, can be used as adsorbent and be directly added again Continue to adsorb lithium into sodium aluminate solution, further enriching lithium carries out recycling 4~5 times；
(4) filtrate obtained through step (3) is passed through seed mixer, continues to decompose into decomposition process, it is lower to finally obtain lithium content Alumina product.Lithium removal efficiency is 15~97%.The application can be used according to target control lithium removal efficiency, removal efficiency and removing Substance, and removing process conditions have direct relation, especially removing process condition.
Embodiment 1
Bayer process sodium aluminate solution concentration Na2Ok: 165g/L, Na2Oc:5g/L, α k:1.10, temperature are 100 DEG C, are added 1g/L's Mixing time 30 minutes, time of repose 3 hours, rich lithium filter cake and filtrate, through detecting, sodium aluminate was obtained by filtration in aluminium hydroxide The removal efficiency of lithium metal in solution is 15.80%.
Embodiment 2
Bayer process sodium aluminate solution concentration Na2Ok: 165g/L, Na2Oc:12g/L, α k:1.10, temperature are 100 DEG C, and 5g/L is added Aluminium hydroxide, mixing time 30 minutes, time of repose 1.5 hours, rich lithium filter cake and filtrate, through detecting, aluminium is obtained by filtration The removal efficiency of lithium metal in acid sodium solution is 21.20%.
Embodiment 3
Bayer process sodium aluminate solution concentration Na2Ok: 200g/L, Na2Oc:40g/L, α k:1.55, temperature are 80 DEG C, and 10g/L is added Gama-alumina, mixing time 30 minutes, time of repose 1.5 hours, rich lithium filter cake and filtrate, through detecting, aluminium is obtained by filtration The removal efficiency of lithium metal in acid sodium solution is 51.52%.
Embodiment 4
Bayer process sodium aluminate solution concentration Na2Ok: 110g/L, Na2Oc:15g/L, α k:1.60, temperature are 65 DEG C, and 10g/L is added Gama-alumina, mixing time 60 minutes, time of repose 2.5 hours, rich lithium filter cake and filtrate, through detecting, aluminium is obtained by filtration The removal efficiency of lithium metal in acid sodium solution is 78.20%, and obtained product containing lithium is silk lithium aluminium stone.
Embodiment 5
Bayer process sodium aluminate solution concentration Na2Ok: 175g/L, Na2Oc:15g/L, α k:2.30, temperature are 70 DEG C, and 20g/L is added Electric dust collection powder, mixing time 60 minutes, time of repose 3 hours, rich lithium filter cake and filtrate, through detecting, aluminic acid is obtained by filtration The removal efficiency of lithium metal in sodium solution is 82.10%.
Embodiment 6
Bayer process sodium aluminate solution concentration Na2Ok: 168g/L, Na2Oc:10g/L, α k:1.53, temperature are 65 DEG C, and 50g/L is added Aluminium hydroxide, mixing time 90 minutes, time of repose 3 hours, rich lithium filter cake and filtrate, through detecting, aluminic acid is obtained by filtration The removal efficiency of lithium metal in sodium solution is 90.31%.
Embodiment 7
Bayer process sodium aluminate solution concentration Na2Ok: 168g/L, Na2Oc:10g/L, α k:1.53, temperature are 65 DEG C, and 30g/L is added Electric dust collection powder, mixing time 90 minutes, time of repose 3 hours, rich lithium filter cake and filtrate, through detecting, aluminic acid is obtained by filtration The removal efficiency of lithium in sodium solution is 91.05%.
Embodiment 8
Bayer process sodium aluminate solution concentration Na2Ok: 175g/L, Na2Oc:19g/L, α k:1.56, temperature are 55 DEG C, and 20g/L is added Bag collection powder, mixing time 90 minutes, time of repose 2.5 hours, rich lithium filter cake and filtrate is obtained by filtration, through detecting, The removal efficiency of lithium in sodium aluminate solution is 80%.
Embodiment 9
Bayer process sodium aluminate solution concentration Na2Ok: 168g/L, Na2Oc:15g/L, α k:1.55, temperature are 80 DEG C, and 20g/L is added Unformed aluminium oxide, mixing time 240 minutes, time of repose 2 hours, rich lithium filter cake and filtrate is obtained by filtration, through detecting, The removal efficiency of lithium in sodium aluminate solution is 87.25%.
Embodiment 10
Bayer process sodium aluminate solution concentration Na2Ok: 165g/L, Na2Oc:20g/L, α k:1.80, temperature are 70 DEG C, and 20g/L is added ρ-aluminium oxide, mixing time 300 minutes, time of repose 2 hours, rich lithium filter cake and filtrate, through detecting, aluminic acid is obtained by filtration The removal efficiency of lithium in sodium solution is 85.08%.
Embodiment 11
Bayer process sodium aluminate solution concentration Na2Ok: 168g/L, Na2Oc:15g/L, α k:1.70, temperature are 100 DEG C, and 20g/L is added Bag collection powder, mixing time 120 minutes, time of repose 2 hours, rich lithium filter cake and filtrate, through detecting, aluminium is obtained by filtration The removal efficiency of lithium is 78.69% in acid sodium solution.
Above-described is only presently preferred embodiments of the present invention, not limitation invention.It should be understood that for the general of this field For logical technical staff, under technical inspiration provided by the present invention, other equivalent improvement can also be made, this may be implemented The purpose of invention, is regarded as protection scope of the present invention.

Claims (10)

1. a kind of method for reducing lithium content in alumina product, which is characterized in that the method step includes:
(1) aluminum contained compound is added in the sodium aluminate solution containing lithium as adsorbent, adsorbs the lithium in sodium aluminate solution；
(2) solution obtained through step (1) is stirred, by controlling solution reaction temperature, mixing time, is promoted in solution Lithium be precipitated；
(3) solution obtained through step (2) is filtered, obtains rich lithium filter cake and filtrate；
(4) filtrate obtained through step (3) enters the subsequent handling for preparing alumina product.
2. the method according to claim 1, wherein in the step (1) aluminum contained compound be aluminium hydroxide, The mixing of one or more of unformed aluminium hydroxide, activated alumina, aluminium oxide dust collection powder.
3. the method according to claim 1, wherein the activated alumina is gama-alumina, in ρ-aluminium oxide One or more of mixing.
4. the method according to claim 1, wherein the aluminium oxide dust collection powder is that electricity gathers dust, in bag collection One or more of mixing.
5. the method according to claim 1, wherein the additional amount of the step (1) aluminum contained compound be 1~ 50g/L。
6. according to the method described in claim 5, it is characterized in that, the additional amount of the step (1) aluminum contained compound be 5~ 30g/L。
7. the method according to claim 1, wherein the step (1) sodium aluminate solution is that Bayer process prepares oxygen Change the intermediate product in aluminium product process, the component and its concentration of sodium aluminate solution include: Na2Ok: 100~200g/L, Na2Oc: K:1.05~2.30 5~40g/L, α.
8. the method according to claim 1, wherein 50~100 DEG C of reaction temperature of the step (2), when stirring Between 30~300min.
9. the method according to claim 1, wherein moisture content in the rich lithium filter cake that the step (3) obtains≤ 40%。
10. the method according to claim 1, wherein the rich lithium filter cake that the step (3) obtains can be used as absorption Agent is added in sodium aluminate solution adsorbs lithium again, is recycled.
CN201811609306.1A 2018-12-27 2018-12-27 A kind of method of lithium content in reduction alumina product Pending CN109485079A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102381722A (en) * 2011-08-10 2012-03-21 郭万里 Preparation method of activated aluminum oxide and product prepared by using same
CN107500318A (en) * 2017-09-26 2017-12-22 马海军 The method that lithium carbonate is extracted from aluminum oxide factory sodium aluminate solution

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102381722A (en) * 2011-08-10 2012-03-21 郭万里 Preparation method of activated aluminum oxide and product prepared by using same
CN107500318A (en) * 2017-09-26 2017-12-22 马海军 The method that lithium carbonate is extracted from aluminum oxide factory sodium aluminate solution

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
刘高: "氢氧化铝沉淀法提锂工艺及铝的循环利用研究", 《中国优秀硕士学位论文全文数据库》 *
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