CN105923640A - Method for extracting aluminum oxide from fly ash through sulfuric acid activation impurity removal - Google Patents

Method for extracting aluminum oxide from fly ash through sulfuric acid activation impurity removal Download PDF

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Publication number
CN105923640A
CN105923640A CN201610246026.3A CN201610246026A CN105923640A CN 105923640 A CN105923640 A CN 105923640A CN 201610246026 A CN201610246026 A CN 201610246026A CN 105923640 A CN105923640 A CN 105923640A
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China
Prior art keywords
calcium
oxide
sulfuric acid
flyash
ammonium
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Chinese (zh)
Inventor
梁兴国
曾伟
兰海平
杨超
李宁
徐涛
季增宝
高璇
王辉
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ACADEMY OF AEROSPACE PROPULSION TECHNOLOGY
China Shenhua Energy Co Ltd
Shenhua Zhunneng Resources Development and Utilisation Co Ltd
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ACADEMY OF AEROSPACE PROPULSION TECHNOLOGY
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Priority to CN201610246026.3A priority Critical patent/CN105923640A/en
Publication of CN105923640A publication Critical patent/CN105923640A/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
    • C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
    • C01F7/26—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with sulfuric acids or sulfates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/74—Preparation
    • C01B17/76—Preparation by contact processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/24—Sulfates of ammonium
    • C01C1/244—Preparation by double decomposition of ammonium salts with sulfates
    • 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
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

Abstract

The invention relates to a method for extracting aluminum oxide from fly ash through sulfuric acid activation impurity removal. The method comprises the steps of: adding sulfuric acid into fly ash; performing heating activation for dissolution out; dividing a dissolved-out solution containing aluminum into two parts; adding sodium hydroxide into one part (3/4) of the solution to generate sodium metaaluminate, so as to remove iron, magnesium, calcium and the like; adding an organic precipitant HTP-19 into the other part (1/4) of the solution to remove iron ions in the solution; then neutralizing the two parts of filtrates to generate aluminum hydroxide; calcining the aluminum hydroxide to generate aluminum oxide; performing causticization on sodium sulfate filtrate to generate sodium hydroxide and calcium sulfate; performing double decomposition on the calcium sulfate and ammonium carbonate to generate ammonium sulfate and calcium carbonate; performing catalytic decomposition on the ammonium sulfate to obtain ammonia gas and sulfur trioxide; sintering the calcium carbonate to obtain calcium oxide and carbon dioxide; and synthesizing the ammonia gas and the carbon dioxide into ammonium carbonate (for recycling). According to the method, full recycling of materials is realized, the process energy consumption and the cost are significantly reduced, the extraction rate of aluminum oxide reaches 93.6-95.8%, and the purity of the produced aluminum oxide is more than 98.9%.

Description

The method that sulfuric acid activated remove impurity extracts aluminium oxide from flyash
Technical field
The present invention relates to a kind of method extracting aluminium oxide from flyash, be specifically related to a kind of sulfuric acid activated remove impurity from fine coal Ash extracts the method for aluminium oxide.
Background technology
Flyash is mainly composed of Al2O3、SiO2And other metal-oxides, China subregion (Inner Mongol, Shaanxi, Shanxi Deng) Al in flyash2O3Content is up to 50 %, belongs to typical aluminous fly-ash, is equivalent to medium grade alumyte, is to produce The valuable source of aluminium oxide.
Both at home and abroad extraction aluminium oxide from flyash is proposed a lot of technical method, can be divided mainly into alkaline process, Acid leaching Method, acid and alkali combination method and ammonium sulfate method.Alkaline process mainly includes that alkali solution technique, limestone sintering process, soda lime sintering process, high temperature burn Knot-microwave irradiations etc., technological process length, energy consumption are high, equipment investment is big, and the level of residue of generation is the several times of flyash, Yi Zao Become secondary pollution.Main employing hydrochloric acid or sulfuric acid to leach method are followed the example of in acidleach, and the method activation temperature is low, and technological process is short, but by The dissolution of the impurity such as Yu Tie, magnesium, calcium, acid system environment remove impurity difficulty, cost is high, and low cost remove impurity has become restriction acid technological process Industrial applications and the key of popularization, in the urgent need to carrying out this furtheing investigate, improve and optimizing.
Summary of the invention
It is an object of the invention to provide a kind of method that sulfuric acid activated remove impurity extracts aluminium oxide from flyash, existing to solve The technical deficiency of sulfuric acid process aluminium oxide extraction process.
The technical solution adopted in the present invention is:
The method that sulfuric acid activated remove impurity extracts aluminium oxide from flyash, it is characterised in that:
Realized by following steps:
Step one: add sulphuric acid, heat-activated in flyash；
Step 2: carry out solid-liquid separation, isolated hot sulphuric acid is back to step one；
Step 3: add water in filtering residue, heat dissolution；
Step 4: carry out solid-liquid separation；
Step 5: filtrate is divided into two parts in proportion, a sodium hydroxide that adds generates sodium metaaluminate, is filtered to remove ferrum, magnesium, calca Matter, another part add organic precipitant HTP-19 be filtered to remove iron tramp, then in two parts of filtrates and generate aluminium hydroxide；
Step 6: aluminium hydroxide calcining generates metallurgical-grade aluminum oxide；
Step 7: filtrate metabisulfite solution causticization generates sodium hydroxide and calcium sulfate, and sodium hydroxide is back to step 5；
Step 8: calcium sulfate and ammonium carbonate double decomposition generate ammonium sulfate and calcium carbonate；
Step 9: ammonium sulfate catalytic decomposition is ammonia and sulfur trioxide, sulfur trioxide water absorbs and generates sulphuric acid；Sulphuric acid is back to step Rapid one；
Step 10: it is calcium oxide and carbon dioxide that calcium carbonate burns solution, and calcium oxide is back to the causticization of step 9, carbon dioxide and ammonia Gas generates ammonium carbonate, and carbon ammonium is back to the double decomposition of step 8.
In step one:
Ash acid mass ratio is 1:(2.8～6), the mass percent of sulphuric acid is 75～98%；
Priming reaction temperature 220～330 DEG C, response time 0.8～3 hours.
In step 2, solid-liquid separation uses decantation.
In step 3:
After separation, solid phase is in pulp water mass ratio 1:(2.6～6) ratio add water, anti-in reactor at 100 DEG C～180 DEG C Answer 0.8～2.2 hour.
In step 5:
Filtrate is divided into two parts by the mass ratio of 3:1: portion is 3/4, add sodium hydroxide generate sodium metaaluminate, be filtered to remove ferrum, Magnesium, calcium impurities；Another part is 1/4, adds organic precipitant HTP-19 and is filtered to remove iron tramp；Then in two parts of filtrates and generate Aluminium hydroxide.
In step 9, the catalyst of ammonium sulfate catalytic decomposition is the one in zinc oxide, copper oxide, ferrum oxide, lead oxide, Decomposition reaction substep is carried out, and 250～500 DEG C discharge ammonia, and ammonia and carbon dioxide be passed through carbonate synthesis ammonium in water, and 600 ～850 DEG C discharge sulfur trioxide, it is passed through in dilute sulfuric acid generation concentrated sulphuric acid.
In step 10, it is 850～920 DEG C that calcium carbonate burns solution temperature, uses suspended state calcining.
The invention have the advantages that
The method is being divided into two parts sulfuric acid activated for flyash rear dissolution in proportion (3/4+1/4) containing aluminum solutions, a (3/4) Adding sodium hydroxide and generate sodium metaaluminate, remove ferrum, magnesium, calcium etc., another part (1/4) is gone by adding organic precipitant HTP-19 Except the iron ion in solution, then in two parts of filtrates and generate aluminium hydroxide, calcining generates aluminium oxide, and sodium sulfate filtrate causticization is raw Sodium hydroxide and calcium sulfate, calcium sulfate is become to generate ammonium sulfate and calcium carbonate, ammonium sulfate catalytic decomposition ammonification with ammonium carbonate double decomposition Gas and sulfur trioxide, it is calcium oxide and carbon dioxide that calcium carbonate burns solution, ammonia and carbon dioxide carbonate synthesis ammonium (cycle utilization), Owing to calcium sulfate burns solution temperature height, and decompose not exclusively, burn the calcium oxide activity deficiency solved, be converted into calcium carbonate burning and solve, adopt Burning by suspended state and solve, be substantially reduced sintering temperature, calcium oxide activity is high.
This technique reduces sodium hydroxide concentration 25%, reduces organic precipitant HTP-19 consumption 75%, and 75% magnesium addition is with hydrogen-oxygen Magnesium precipitate removes, and a small amount of magnesium addition does not affect product (index no requirement (NR)), and sodium, potassium impurity are useful in process system, it is not necessary to go Remove；Calcium hydroxide does not reaches saturated, separates with aluminum in aluminum hydroxide precipitation link, does not affect product quality；Outside desilication slag, without other Solid waste discharge, it is achieved that Ash Utilization, minimizing utilize, emission-free absorption operation；Impurity removal process is simple, and cost is the lowest； Overall water consumption is few, does not produce sewage discharge；Without highly energy-consuming operations such as evaporation, concentrations in whole technique, it is known that power consumption operation energy Consume limited.
This technology thoroughly solves a remove impurity difficult problem, and product quality this technique guaranteed achieves flyash minimizing profit With, material realizes complete alternation and utilizes, and process energy consumption and cost are remarkably decreased, and alumina extraction ratio reaches 93.6.～95.8%.Oxygen Change aluminum product purity 98.9%.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
The method of extraction aluminium oxide of the present invention uses sulphuric acid to abolish fine coal under certain condition as activator Si-O-Al key in ash, to improve the reaction efficiency of follow-up dissolution reaction.
Priming reaction realizes based on following reaction:
Al2O3 + 3H2SO4 = Al2(SO4)3 + 3H2O
After activation, material obtains the thick liquid of aluminum sulfate through dissolution, solid-liquid separation, generates sodium aluminate solution after adding excessive sodium hydrate, Add small amounts calcium, destroy ferric hydroxide colloid, be filtered to remove the impurity such as ferrum, magnesium, calcium, plant mitogenetic one-tenth aluminium hydroxide, filtrate For sodium sulfate and sodium hydroxide solution；Aluminium hydroxide calcining generates aluminium oxide.Sodium sulfate and sodium hydroxide filtrate add hydroxide Calcium causticization generates sodium hydroxide and calcium sulfate, and calcium sulfate is converted into calcium carbonate and burns solution, realizes based on following reaction:
Na2SO4 +Ca(OH)2→CaSO4↓+ Na2CO3
CaSO4+(NH4)2CO3→CaCO3↓+(NH4)2SO4
CaCO3→CaO+CO2↑
(NH4)2SO4+ CuO →CuSO4+NH3+ H2O↑(500℃)
CO2+ NH3+H2O→(NH4)2CO3
CuSO4→CuO+SO3↑(850℃)
SO3+ H2O→H2SO4
Specifically realized by following steps:
Step one: add sulphuric acid, heat-activated in flyash；
Step 2: carry out solid-liquid separation, isolated hot sulphuric acid is back to step one；
Step 3: add water in filtering residue, heat dissolution；
Step 4: carry out solid-liquid separation；
Step 5: filtrate is divided into two parts in proportion, a sodium hydroxide that adds generates sodium metaaluminate, is filtered to remove ferrum, magnesium, calca Matter, another part add organic precipitant HTP-19 be filtered to remove iron tramp, then in two parts of filtrates and generate aluminium hydroxide；
Step 6: aluminium hydroxide calcining generates metallurgical-grade aluminum oxide；
Step 7: filtrate metabisulfite solution causticization generates sodium hydroxide and calcium sulfate, and sodium hydroxide is back to step 5；
Step 8: calcium sulfate and ammonium carbonate double decomposition generate ammonium sulfate and calcium carbonate；
Step 9: ammonium sulfate catalytic decomposition is ammonia and sulfur trioxide, sulfur trioxide water absorbs and generates sulphuric acid；Sulphuric acid is back to step Rapid one；
Step 10: it is calcium oxide and carbon dioxide that calcium carbonate burns solution, and calcium oxide is back to the causticization of step 9, carbon dioxide and ammonia Gas generates ammonium carbonate, and carbon ammonium is back to the double decomposition of step 8.
In step one:
Ash acid mass ratio is 1:(2.8～6), the mass percent of sulphuric acid is 75～98%, and acid adding amount should be scaled pure sulfuric acid amount；
Priming reaction temperature 220～330 DEG C, response time 0.8～3 hours.
In step 2, solid-liquid separation uses decantation.
In step 3:
After separation, solid phase is in pulp water mass ratio 1:(2.6～6) ratio add water, anti-in reactor at 100 DEG C～180 DEG C Answer 0.8～2.2 hour.
In step 5:
Filtrate is divided into two parts by the mass ratio of 3:1: portion is 3/4, add sodium hydroxide generate sodium metaaluminate, be filtered to remove ferrum, Magnesium, calcium impurities；Another part is 1/4, adds organic precipitant HTP-19 and is filtered to remove iron tramp；Then in two parts of filtrates and generate Aluminium hydroxide.
In step 9, the catalyst of ammonium sulfate catalytic decomposition is the one in zinc oxide, copper oxide, ferrum oxide, lead oxide, Decomposition reaction substep is carried out, and 250～500 DEG C discharge ammonia, and ammonia and carbon dioxide be passed through carbonate synthesis ammonium in water, and 600 ～850 DEG C discharge sulfur trioxide, it is passed through in dilute sulfuric acid generation concentrated sulphuric acid.
In step 10, it is 850～920 DEG C that calcium carbonate burns solution temperature, uses suspended state calcining, improves calcination efficiency, reduction Energy consumption.
Concrete technology flow process is shown in Fig. 1.
Embodiment one:
Taking 1 t coal ash (salic 52.7%), add 3.2t75% sulphuric acid, 330 DEG C of priming reactions 2.5 hours, decant solid-liquid divides From, first slightly incline, the most carefully incline；The hot sulphuric acid that pours out recycles, and after separation, solid phase adds water 2.6t, and 150 DEG C of heated and stirred react 3 Hour, solid-liquid separation, wash filtering residue with 0.8t water, washings are for the reaction of dissolution again.Take stirring in 4.824t filtrate to add 1.2t sodium hydroxide, is filtered to remove ferrum, magnesium, calcium etc., there was added 40% machine precipitant HTP-19 47 in remaining 1.613t filtrate Rising, be filtered to remove ferrum precipitation, by the filtrate mixing ageing 1 hour of twice filtration institute, solid-liquid separation obtains aluminium hydroxide, calcining hydrogen Aluminium oxide obtains aluminium oxide 0.481 t, and extraction ratio 91.3%(has a small amount of Aluminum in cleaning mixture, cleaning mixture circulation when producing continuously Using, activation and extraction aluminum can all extract), aluminium oxide purity 98.9%.Solid-liquid separation filtrate adds 0.84t calcium oxide, and solid-liquid divides Separating out hydrous calcium sulfate, add 4.6 t water, 1.57t ammonium carbonate, extract ammonium sulfate, solid-liquid separation obtains precipitation of calcium carbonate, 920 DEG C of fluidization states are calcined 8 minutes, obtain calcium oxide 0.83t；Ammonium sulfate adds 1.45 t copper oxides, is heated to 450 DEG C, constant temperature 0.7 hour, (carbon dioxide that the ammonia of releasing and calcination of calcium carbonate are released is passed through in water jointly, generates ammonium carbonate), Continuing to be heated to 850 DEG C, constant temperature 20 minutes, the gas discharged is passed through dilute sulfuric acid and absorbs into concentrated sulphuric acid.
Embodiment two:
Take 1 t coal ash (salic 52.7%), add 6t98% sulphuric acid, 250 DEG C of priming reactions 2.5 hours, decant solid-liquid separation, First slightly incline, the most carefully incline；The hot sulphuric acid that pours out recycles, and after separation, solid phase adds water 5t, and 120 DEG C of heated and stirred are reacted 2 hours, Solid-liquid separation, washs filtering residue with 0.6t water, and washings are for the reaction of dissolution again.Take stirring in 5.02t filtrate and add 1.17t hydrogen Sodium oxide, is filtered to remove ferrum, magnesium, calcium etc., there was added 40% machine precipitant HTP-19 46 liters in remaining 1.68t filtrate, filters Removing ferrum precipitate, by twice filtration institute filtrate mixing be aged 1 hour, solid-liquid separation obtains aluminium hydroxide, calcinations of aluminum hydroxide Obtaining aluminium oxide 0.477 t, extraction ratio 90.5%(and have a small amount of Aluminum in cleaning mixture, when producing continuously, cleaning mixture recycles, Activation and extraction aluminum can all extract), aluminium oxide purity 99.0%.Solid-liquid separation filtrate adds 0.83t calcium oxide, solid-liquid separation Hydrous calcium sulfate, adds 4.2 t water, 1.55t ammonium carbonate, extracts ammonium sulfate, and solid-liquid separation obtains precipitation of calcium carbonate, and 900 DEG C fluidization state is calcined 10 minutes, obtains calcium oxide 0.82t；Ammonium sulfate adds 1.45 t copper oxides, is heated to 500 DEG C, constant temperature 0.4 hour, (carbon dioxide that the ammonia of releasing and calcination of calcium carbonate are released is passed through in water jointly, generates ammonium carbonate), Continuing to be heated to 850 DEG C, constant temperature 20 minutes, the gas discharged is passed through dilute sulfuric acid and absorbs into concentrated sulphuric acid.
Embodiment three:
Taking 1t coal ash (salic 52.7%), add 6.4t90% sulphuric acid, 320 DEG C of priming reactions 1.5 hours, decant solid-liquid divides From, first slightly incline, the most carefully incline；The hot sulphuric acid that pours out recycles, and after separation, solid phase adds water 4.2t, and 150 DEG C of heated and stirred, solid-liquid divides From, washing filtering residue with 0.6t water, washings are for the reaction of dissolution again.Take stirring in 3.94t filtrate and add 1.16t hydroxide Sodium, is filtered to remove ferrum, magnesium, calcium etc., there was added 40% machine precipitant HTP-19 45 liters, be filtered to remove in remaining 1.301t filtrate Ferrum precipitate, by twice filtration institute filtrate mixing be aged 1 hour, solid-liquid separation obtains aluminium hydroxide, and calcinations of aluminum hydroxide obtains oxygen Changing aluminum 0.483 t, extraction ratio 91.6%(and have a small amount of Aluminum in cleaning mixture, when producing continuously, cleaning mixture recycles, activation Aluminum can all extract), aluminium oxide purity 99.1%.Solid-liquid separation filtrate adds 0.83t calcium oxide, and solid-liquid separation is aqueous Calcium sulfate, adds 5.2 t water, 1.55t ammonium carbonate, extracts ammonium sulfate, and solid-liquid separation obtains precipitation of calcium carbonate, at 880 DEG C Fluidisation state is calcined 12 minutes, obtains calcium oxide 0.84t；Ammonium sulfate adds 1.45 t copper oxides, is heated to 500 DEG C, permanent Temperature 0.4 hour, (carbon dioxide that the ammonia of releasing and calcination of calcium carbonate are released is passed through in water jointly, generates ammonium carbonate), continue Being heated to 850 DEG C, constant temperature 20 minutes, the gas discharged is passed through dilute sulfuric acid and absorbs into concentrated sulphuric acid.
Present disclosure is not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention And the conversion of any equivalence that technical solution of the present invention is taked, the claim being the present invention is contained.

Claims (7)

  1. The method that the most sulfuric acid activated remove impurity extracts aluminium oxide from flyash, it is characterised in that:
    Realized by following steps:
    Step one: add sulphuric acid, heat-activated in flyash；
    Step 2: carry out solid-liquid separation, isolated hot sulphuric acid is back to step one；
    Step 3: add water in filtering residue, heat dissolution；
    Step 4: carry out solid-liquid separation；
    Step 5: filtrate is divided into two parts in proportion, a sodium hydroxide that adds generates sodium metaaluminate, is filtered to remove ferrum, magnesium, calca Matter, another part add organic precipitant HTP-19 be filtered to remove iron tramp, then in two parts of filtrates and generate aluminium hydroxide；
    Step 6: aluminium hydroxide calcining generates metallurgical-grade aluminum oxide；
    Step 7: filtrate metabisulfite solution causticization generates sodium hydroxide and calcium sulfate, and sodium hydroxide is back to step 5；
    Step 8: calcium sulfate and ammonium carbonate double decomposition generate ammonium sulfate and calcium carbonate；
    Step 9: ammonium sulfate catalytic decomposition is ammonia and sulfur trioxide, sulfur trioxide water absorbs and generates sulphuric acid；Sulphuric acid is back to step Rapid one；
    Step 10: it is calcium oxide and carbon dioxide that calcium carbonate burns solution, and calcium oxide is back to the causticization of step 9, carbon dioxide and ammonia Gas generates ammonium carbonate, and carbon ammonium is back to the double decomposition of step 8.
  2. The method that sulfuric acid activated remove impurity the most according to claim 1 extracts aluminium oxide from flyash, it is characterised in that:
    In step one:
    Ash acid mass ratio is 1:(2.8～6), the mass percent of sulphuric acid is 75～98%；
    Priming reaction temperature 220～330 DEG C, response time 0.8～3 hours.
  3. The method that sulfuric acid activated remove impurity the most according to claim 1 extracts aluminium oxide from flyash, it is characterised in that:
    In step 2, solid-liquid separation uses decantation.
  4. The method that sulfuric acid activated remove impurity the most according to claim 1 extracts aluminium oxide from flyash, it is characterised in that:
    In step 3:
    After separation, solid phase is in pulp water mass ratio 1:(2.6～6) ratio add water, anti-in reactor at 100 DEG C～180 DEG C Answer 0.8～2.2 hour.
  5. The method that sulfuric acid activated remove impurity the most according to claim 1 extracts aluminium oxide from flyash, it is characterised in that:
    In step 5:
    Filtrate is divided into two parts by the mass ratio of 3:1: portion is 3/4, add sodium hydroxide generate sodium metaaluminate, be filtered to remove ferrum, Magnesium, calcium impurities；Another part is 1/4, adds organic precipitant HTP-19 and is filtered to remove iron tramp；Then in two parts of filtrates and generate Aluminium hydroxide.
  6. The method that sulfuric acid activated remove impurity the most according to claim 1 extracts aluminium oxide from flyash, it is characterised in that:
    In step 9, the catalyst of ammonium sulfate catalytic decomposition is the one in zinc oxide, copper oxide, ferrum oxide, lead oxide, decomposes Reaction substep is carried out, and 250～500 DEG C discharge ammonia, and ammonia and carbon dioxide are passed through carbonate synthesis ammonium in water, 600～850 DEG C discharge sulfur trioxide, be passed through in dilute sulfuric acid generation concentrated sulphuric acid.
  7. The method that sulfuric acid activated remove impurity the most according to claim 1 extracts aluminium oxide from flyash, it is characterised in that:
    In step 10, it is 850～920 DEG C that calcium carbonate burns solution temperature, uses suspended state calcining.
CN201610246026.3A 2016-04-20 2016-04-20 Method for extracting aluminum oxide from fly ash through sulfuric acid activation impurity removal Pending CN105923640A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106495193A (en) * 2016-10-31 2017-03-15 航天推进技术研究院 Based on the method that ethanol auxiliary agent extracts aluminum oxide in flyash using ammonium sulfate method
CN106745027A (en) * 2016-11-30 2017-05-31 天津大学 A kind of flyash synthesizes the method for analcime

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CN101531346A (en) * 2008-03-14 2009-09-16 张智新 Method for converting and decomposing gypsum to produce sulfuric acid
CN101987735A (en) * 2010-12-10 2011-03-23 合肥工业大学 Method for extracting alumina from coal gasification fly ash at low temperature
CN102101686A (en) * 2010-12-23 2011-06-22 内蒙古昶泰资源循环再生利用科技开发有限责任公司 Process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina
WO2015042692A1 (en) * 2013-09-26 2015-04-02 Orbite Aluminae Inc. Processes for preparing alumina and various other products
CN104556168A (en) * 2014-12-22 2015-04-29 中国神华能源股份有限公司 Method of activated leaching alumina in fly ash

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101531346A (en) * 2008-03-14 2009-09-16 张智新 Method for converting and decomposing gypsum to produce sulfuric acid
CN101987735A (en) * 2010-12-10 2011-03-23 合肥工业大学 Method for extracting alumina from coal gasification fly ash at low temperature
CN102101686A (en) * 2010-12-23 2011-06-22 内蒙古昶泰资源循环再生利用科技开发有限责任公司 Process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina
WO2015042692A1 (en) * 2013-09-26 2015-04-02 Orbite Aluminae Inc. Processes for preparing alumina and various other products
CN104556168A (en) * 2014-12-22 2015-04-29 中国神华能源股份有限公司 Method of activated leaching alumina in fly ash

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106495193A (en) * 2016-10-31 2017-03-15 航天推进技术研究院 Based on the method that ethanol auxiliary agent extracts aluminum oxide in flyash using ammonium sulfate method
CN106745027A (en) * 2016-11-30 2017-05-31 天津大学 A kind of flyash synthesizes the method for analcime
CN106745027B (en) * 2016-11-30 2019-04-12 天津大学 A kind of method of flyash synthesis analcime

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