CN107662935A - A kind of method that aluminum oxide and silicic acid are extracted from flyash - Google Patents

A kind of method that aluminum oxide and silicic acid are extracted from flyash Download PDF

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Publication number
CN107662935A
CN107662935A CN201711076688.1A CN201711076688A CN107662935A CN 107662935 A CN107662935 A CN 107662935A CN 201711076688 A CN201711076688 A CN 201711076688A CN 107662935 A CN107662935 A CN 107662935A
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China
Prior art keywords
flyash
aluminum oxide
solution
filtrate
silicic acid
Prior art date
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Pending
Application number
CN201711076688.1A
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Chinese (zh)
Inventor
洪伟
张渤
�田�浩
张春田
张冀平
程红兵
吴舒
任宇红
孙敬
曹光
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People's Republic Of China Qinhuangdao Entry-Exit Inspection And Quarantine Bureau Coal Inspection Technique Center
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People's Republic Of China Qinhuangdao Entry-Exit Inspection And Quarantine Bureau Coal Inspection Technique Center
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Application filed by People's Republic Of China Qinhuangdao Entry-Exit Inspection And Quarantine Bureau Coal Inspection Technique Center filed Critical People's Republic Of China Qinhuangdao Entry-Exit Inspection And Quarantine Bureau Coal Inspection Technique Center
Priority to CN201711076688.1A priority Critical patent/CN107662935A/en
Publication of CN107662935A publication Critical patent/CN107662935A/en
Pending legal-status Critical Current

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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
    • C01F7/08—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals with sodium carbonate, e.g. sinter processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Silicon Compounds (AREA)

Abstract

The invention discloses a kind of method that aluminum oxide and silicic acid are extracted from flyash, flyash and soda ash are mixed into stove, react 40min at a temperature of 1300 DEG C, fine grained material of the obtained molten mass with cold water water quenching into 1mm~5mm；By the wet-milling of fine grained material into thick slurry, dilution, it is heated to 70 DEG C and is filtered in 2h, multiple times of filtration again after worrying too much, and the filtrate of multiple times of filtration is merged into dilution and hydrolyzes and uses CO2Gas pressurized carries out carbonating processing, obtains Al (OH)3Precipitation and the 4th filtrate；Aluminium hydroxide is calcined to obtain aluminum oxide；CO is used to the 4th filtrate2Gas pressurized carries out carbonating processing, reduces the pH value of solution, makes NaHSiO in solution3Almost all hydrolysis turns into H2SiO3Precipitation, isolates H2SiO3Afterwards, solution turns into dilute Na2CO3Solution.Simple efficient extraction extraction aluminum oxide and silicic acid, and recycle soda ash.

Description

A kind of method that aluminum oxide and silicic acid are extracted from flyash
Technical field
The present invention relates to a kind of method that aluminum oxide and silicic acid are extracted from flyash.
Background technology
Flyash, is the fine ash that catching is got off from the flue gas after coal combustion, and flyash is the main of coal-burning power plant's discharge Solid waste.The main oxides of power plants flyash form：SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2 etc.. With the development of power industry, the flyash discharge capacity of coal-burning power plant increases year by year, turns into the larger industry of the current discharge capacity in China One of waste residue.Substantial amounts of flyash is untreated, will produce airborne dust, pollutes air；River can be caused to silt up if being discharged into water system, And toxic chemical substance therein can also damage to human body and biology.
Therefore how to extract beneficial compound from flyash turns into urgent problem to be solved.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the invention to provide one kind to extract aluminum oxide and silicic acid from flyash Method.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of method that aluminum oxide and silicic acid are extracted from flyash, comprises the following steps：
Flyash and soda ash are mixed into stove, react 40min at a temperature of 1300 DEG C, the cold water water quenching of obtained molten mass Into 1mm~5mm fine grained material；
By the wet-milling of fine grained material into thick slurry, dilution, it is heated to 70 DEG C and is filtered in 2h, obtain a filter cake； Concentration is reheated after one time filter cake is dissolved with concentrated caustic, bakees drying, obtains dry powder；By the dissolving of obtained dry mash, filtering, two are obtained Secondary filter cake, secondary filter cake are dissolved with concentrated caustic, filtered again, obtain filter cake three times；
The filtrate of 3 filterings is merged into dilution hydrolysis and uses CO2Gas pressurized carries out carbonating processing, neutralizes NaOH, The pH value of solution is reduced, obtains Al (OH)3Precipitation and the 4th filtrate；
Aluminium hydroxide is calcined to obtain aluminum oxide；
4th filtrate is Na2CO 3And NaHSiO3Mixed solution, continue to mixed solution CO2Gas pressurized is entered The processing of row carbonating, reduces the pH value of solution, makes NaHSiO in solution3Almost all hydrolysis turns into H2SiO3Precipitation, is isolated H2SiO3Afterwards, solution turns into dilute Na2CO3Solution.
Further, the mass ratio of flyash and soda ash is 1 ︰ 1.2~1.3.
Further, by dilute Na2CO3After appropriate concentration, continue to use CO2Pressurization carries out carbonating and handles to obtain NaHCO3It is brilliant Body, to NaHCO3Crystal is dried processing and obtains soda ash Na2CO3Circulate and melt process for soda ash alkali and make raw material.
Compared with prior art, advantageous effects of the invention：Its extraction process is simple, can efficiently utilize soda ash Purged with from flyash and take out aluminium hydroxide and silicic acid, and Na can be obtained from final product2CO3Solution is pure to recycle Alkali.
Embodiment
A kind of method that aluminum oxide and silicic acid are extracted from flyash, comprises the following steps：
Flyash and soda ash are mixed into stove for 1 ︰ 1.2~1.3 in mass ratio, 40min is reacted at a temperature of 1300 DEG C, so Fine grained material by obtained molten mass with cold water water quenching into 1mm~5mm afterwards；
By the wet-milling of fine grained material into thick slurry, dilution, it is heated to 70 DEG C and is filtered in 2h, obtain a filter cake； Concentration is reheated after one time filter cake is dissolved with concentrated caustic, bakees drying, obtains dry powder；By the dissolving of obtained dry mash, filtering, two are obtained Secondary filter cake, secondary filter cake are dissolved with concentrated caustic, filtered again, obtain filter cake three times；
The filtrate of 3 filterings is merged into dilution hydrolysis and uses CO2Gas pressurized carries out carbonating processing, neutralizes NaOH, The pH value of solution is reduced, obtains Al (OH)3Precipitation and the 4th filtrate；
Aluminium hydroxide is calcined to obtain aluminum oxide；
4th filtrate is Na2CO 3And NaHSiO3Mixed solution, continue to mixed solution CO2Gas pressurized is entered The processing of row carbonating, reduces the pH value of solution, makes NaHSiO in solution3Almost all hydrolysis turns into H2SiO3Precipitation, is isolated H2SiO3Afterwards, solution turns into dilute Na2CO3Solution.
By dilute Na2CO3After appropriate concentration, continue to use CO2Pressurization carries out carbonating and handles to obtain NaHCO3Crystal, to NaHCO3 Crystal is dried processing and obtains soda ash Na2CO3Circulate and melt process for soda ash alkali and make raw material.
Embodiment described above is only that the preferred embodiment of the present invention is described, and not the scope of the present invention is carried out Limit, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art make to technical scheme Various modifications and improvement, all should fall into claims of the present invention determination protection domain in.

Claims (3)

  1. A kind of 1. method that aluminum oxide and silicic acid are extracted from flyash, it is characterised in that comprise the following steps：
    Flyash and soda ash are mixed into stove, react 40min at a temperature of 1300 DEG C, obtained molten mass with cold water water quenching into 1mm~5mm fine grained material；
    By the wet-milling of fine grained material into thick slurry, dilution, it is heated to 70 DEG C and is filtered in 2h, obtain a filter cake；Once Filter cake reheats concentration, bakees drying after being dissolved with concentrated caustic, obtain dry powder；By the dissolving of obtained dry mash, filtering, secondary filter is obtained Cake, secondary filter cake are dissolved with concentrated caustic, filtered again, obtain filter cake three times；
    The filtrate of 3 filterings is merged into dilution hydrolysis and uses CO2Gas pressurized carries out carbonating processing, neutralizes NaOH, reduces molten The pH value of liquid, obtain Al (OH)3Precipitation and the 4th filtrate；
    Aluminium hydroxide is calcined to obtain aluminum oxide；
    4th filtrate is Na2CO3And NaHSiO3Mixed solution, continue to mixed solution CO2Gas pressurized is carbonated Processing, reduces the pH value of solution, makes NaHSiO in solution3Almost all hydrolysis turns into H2SiO3Precipitation, isolates H2SiO3Afterwards, it is molten Liquid turns into dilute Na2CO3Solution.
  2. 2. the method according to claim 1 that aluminum oxide and silicic acid are extracted from flyash, it is characterised in that：Flyash with The mass ratio of soda ash is 1 ︰ 1.2~1.3.
  3. 3. the method according to claim 1 that aluminum oxide and silicic acid are extracted from flyash, it is characterised in that：Will be dilute Na2CO3After appropriate concentration, continue to use CO2Pressurization carries out carbonating and handles to obtain NaHCO3Crystal, to NaHCO3Crystal is dried Processing obtains soda ash Na2CO3Circulate and melt process for soda ash alkali and make raw material.
CN201711076688.1A 2017-11-06 2017-11-06 A kind of method that aluminum oxide and silicic acid are extracted from flyash Pending CN107662935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711076688.1A CN107662935A (en) 2017-11-06 2017-11-06 A kind of method that aluminum oxide and silicic acid are extracted from flyash

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711076688.1A CN107662935A (en) 2017-11-06 2017-11-06 A kind of method that aluminum oxide and silicic acid are extracted from flyash

Publications (1)

Publication Number Publication Date
CN107662935A true CN107662935A (en) 2018-02-06

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101172634A (en) * 2007-10-11 2008-05-07 刘成长 Technique for producing hydroted alumina and silicic acid with coal ash
CN101857253A (en) * 2009-04-09 2010-10-13 刘庆玲 Process for producing aluminium hydroxide, silicic acid and sodium carbonate by utilizing fly ash

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101172634A (en) * 2007-10-11 2008-05-07 刘成长 Technique for producing hydroted alumina and silicic acid with coal ash
CN101857253A (en) * 2009-04-09 2010-10-13 刘庆玲 Process for producing aluminium hydroxide, silicic acid and sodium carbonate by utilizing fly ash

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Application publication date: 20180206

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