CN104073651A - Method for extracting aluminum and iron from high iron gibbsite-type bauxite - Google Patents

Method for extracting aluminum and iron from high iron gibbsite-type bauxite Download PDF

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CN104073651A
CN104073651A CN201310109143.1A CN201310109143A CN104073651A CN 104073651 A CN104073651 A CN 104073651A CN 201310109143 A CN201310109143 A CN 201310109143A CN 104073651 A CN104073651 A CN 104073651A
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iron
aluminium
bauxite
slag
liquid
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张盈
高云楠
郑诗礼
王晓辉
李猛
张懿
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Institute of Process Engineering of CAS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to a method for separating and extracting aluminum and iron in bauxite by treating high iron gibbsite-type bauxite by using an alkali medium two-stage wet dissolution process. The primary dissolution of the method comprises the following steps: dissolving out easily dissoluble aluminum component in the high iron gibbsite-type bauxite at low temperature by using a sodium aluminate solution in low alkali concentration, separating liquid from solid, seed-precipitating the primary dissolved solution to obtain an aluminum hydroxide product, and returning the seed-precipitating mother solution for dissolving out the bauxite; the secondary dissolution comprises the following steps: treating primary dissolved slag at a high temperature high-alkaline condition by using an alkali liquor in high molecular ratio or low molecular ratio, feeding aluminum and silicon in the slag into a liquid phase, separating liquid from solid to obtain iron-enriched slag, returning the liquid phase for treating the primary dissolves slag after diluting and removing aluminum and silicone, evaporating and concentrating. The process flow of the method is simple, the separating effect of the iron and the aluminum is obvious so as to respectively obtain aluminum oxide and iron-enriched slag, the iron-enriched slag can be directly used as iron making raw material, and an efficient method for utilizing the high iron bauxite resource in China.

Description

A kind of method that in high iron gibbsite-type bauxite, aluminium and iron extract
Technical field
The present invention relates to a kind of method that in high iron gibbsite-type bauxite, aluminium and iron extract, specifically relate to a kind of method that adopts two sections of wet method strippings of alkaline media to extract respectively aluminium and iron.
Background technology
Aluminium is the second largest metallic substance that is only second to iron and steel, and purposes is extremely extensive, up to 91%, is the great mainstay industry of country with the relational degree of national economy.Aluminum oxide basis raw material output as aluminium industry upstream is steady growth always, and within 2012, China's aluminum oxide output reaches 3,772 ten thousand tons, accounts for the more than 1/3 of whole world ultimate production.Bauxite is the main raw material of producing aluminum oxide, yet China's bauxite reserves only account for 1.5% of world saving, and according to the bauxite consumption of current ton aluminum oxide output, China's bauxite resource ensures time limit less than 10 years, the contradiction of resource scarcity.
Along with the exhaustion of high-quality bauxite resource, the exploitation of poor thin assorted difficult bauxite resource comes into one's own just day by day.According to detection, China has abundant characteristic high-iron bauxite resource, and its prospective reserves reaches more than 2,000,000,000 tons.And, the high iron gibbsite-type bauxite that extensively distributing on the ground such as Guigang, Binyang and Heng County of China's Central Guangxi, its reserves are over 200,000,000 tons.High iron gibbsite-type bauxite mainly consists of mutually things such as gibbsite, pyrrhosiderite, rhombohedral iron ore, kaolinite, quartz, anatase octahedrites, salic 20～27% in ore, ferric oxide 35～48%, silicon-dioxide 4～13%, alumina silica ratio 2～3.5.Though the main ingredient total amount such as aluminium, iron, silicon is more than 70% in ore, but in ore, two important indicators of alumina content and alumina silica ratio all fail to meet the requirement of current process for making alumina, and iron oxide content is also lower, can not be directly used in ironmaking, this ore deposit is dull resource at present.The in the situation that of China's bauxite resource wretched insufficiency, how to utilize the high-iron bauxite resource of China's characteristic to become the huge difficult problem that aluminum oxide industry faces, over several years, China investigator has carried out a large amount of research work for the recycling of aluminium and iron in the high-iron bauxite resource of China's characteristic.
At present, the research for ferro-aluminum recycling in high-iron bauxite, mainly contains " first smelting after choosing ", " iron after first aluminium " and " aluminium after first iron " three kinds of more ripe techniques, also has some acid system method reports.
" first smelting after choosing " technique is adopt beneficiation method by iron aluminium concentration and separation and remove part gangue mineral, then the iron enriched substance of acquisition and aluminium enriched substance is respectively used to the process of smelting iron and producing aluminum oxide.As Chinese invention patent CN1806930A discloses the method for comprehensive utilization that the separated and anion reverse floatation of ferro-aluminum magnetic separation in a kind of high-iron bauxite reclaims iron with CN101417260A, detailed process is that high-iron bauxite is first roughly selected through strong magnetic separator after fragmentation, separated acquisition roughly selected iron ore concentrate and roughly selected aluminium concentrate, roughly select iron ore concentrate through the selected iron ore concentrate of the selected acquisition of strong magnetic separator, roughly selecting aluminium concentrate scans to obtain through strong magnetic separator and scans aluminium concentrate, selected iron ore concentrate reclaims and obtains rich iron ore concentrate through anion reverse floatation repeatedly, after scanning aluminium finished ore desliming, obtain aluminum oxide concentrate, Chinese invention patent CN102806146A discloses a kind of high-iron bauxite direct-flotation desiliconisation method.Although this method can realize the separation of aluminium/iron/silicon to a certain extent, but because Iron In Iron-rich Containing Bauxite aluminium mineral granularity is trickle, mutually cementing, isomorph phenomenon obviously, the monomer dissociation poor performance of complicated, the mineral of embedding cloth relation, so separation efficiency is not high, and magnetic separator energy consumption is higher, the aluminium of carrying secretly in a large amount of milltailings and iron are difficult to utilize.
" aluminium after first iron " technique is first high-iron bauxite to be smelted and carried iron in blast furnace (or electric furnace), then slag is leached to the method for extracting aluminum oxide.As Chinese invention patent CN1766128A has reported high-iron bauxite blast-furnace smelting, carry iron-calcium aluminate slag sodium carbonate solution and leach the technical process of carrying aluminium, can realize the recovery of iron and aluminium.But it is higher that this method is carried iron cost, and economic benefit is poor.
" iron after first aluminium " technique is first from raw ore, to extract aluminum oxide by relatively ripe Bayer process, then the iron in digestion residue red mud is reclaimed.As Chinese invention patent CN102583477A discloses a kind of " iron after first aluminium " method, first high-iron bauxite is adopted lime bayer method to extract most of aluminum oxide, the low alkali red mud that Bayer process produces adopts coal-based rotary hearth furnace prereduction, and iron and aluminium slag are carried out to high temperature melting and divide, the calcium aluminate slag of the modified generation of aluminium slag leaches and further extracts aluminum oxide through sodium carbonate solution.The cost that this method is carried iron is higher, poor with " aluminium after first iron " the same economic benefit of method.
Also there is in recent years a large amount of acid technological process reports, leach medium and comprise hydrochloric acid and sulfuric acid etc.
The Patents that the hydrochloric acid of take be to leach medium has several pieces, and its difference is the separation method of iron and aluminium in hydrochloric acid medium, as Chinese invention patent CN101823742A adopts ferro-aluminum extracting and separating/AlCl 3raffinate pyrolysis-hydrogenchloride circulation/FeCl 3the ferro-aluminum separation method of strip liquor pyrolysis; Chinese invention patent CN102443697A carries out evaporation concentration or the dry FeCl that makes by hydrochloric acid leachate 3and AlCl 3mixed crystal, mixed crystal is converted into γ-Al after pyrolysis 2o 3, Fe 2o 3and hydrogen chloride gas, hydrogen chloride gas cyclically utilizing, γ-Al 2o 3and Fe 2o 3through Bayer process, prepare Al 2o 3product, realizes ferro-aluminum separation; Chinese invention patent CN102515223A adds excessive NaOH solution in hydrochloric acid leachate, and after rich scum separation, sodium-chlor-sodium aluminate mixing solutions makes Cl through membrane electrolysis method 2, H 2, NaOH solution and sodium aluminate solution, sodium aluminate solution imports to plant in seed precipitation tank and minute obtains an aluminium hydroxide product, seed precipitation solution and NaOH solution return to hydrochloric acid leachate alkalization operation.Aforesaid method can be realized ferro-aluminum separation in hydrochloric acid medium in theory, but flow process is all more complicated, and pyrogenic processes energy consumption is higher, higher to equipment requirements, and electrolytic process power consumption is high, and above-mentioned separation method economy is poor.
The methods involving that relates to sulfuric acid medium mainly comprises several as follows: Chinese invention patent CN102643985A proposes two sections of sulfuric acid leaching techniques, one section is leached the components such as iron under low temperature in low-concentration sulfuric acid medium, one section of leach liquor after deironing and benefit acid further leaches aluminium under pressurized conditions, the crystallization of aluminium pregnant solution goes out after Tai-Ace S 150, and after crystallization, liquid returns to one section of stripping.Chinese invention patent CN101734698A proposes the treatment process of ammonium sulfate roasting/product of roasting water logging/exsiccated ammonium alum leach liquor deironing-heavy aluminium/ammonium sulfate media circulation.Chinese invention patent CN102432071A has further proposed high-iron bauxite sulfurization roasting/product of roasting stripping-deironing-heavy aluminium/Fe 2o 3-Al (OH) 3method prepared by-SILICA FUME product.There is the problems such as flow process complexity, roasting apparatus requirement height in aforesaid method.
In addition, also there is investigator to propose the method that iron is carried in magnetizing roasting or reducing roasting.Chinese invention patent CN101767057A adopts magnetizing roasting/magnetic separation separation to put forward the method for iron, but magnetizing roasting energy consumption is high; Chinese invention patent CN101875129A proposes high-iron bauxite reducing roasting/magnetic separation and puies forward the method for iron/rich aluminium slag dilute sulphuric acid leaching/leach liquor porous adsorbent divided silicon system silica-based product/Tai-Ace S 150 scavenging solution aluminium product processed, but has the defect that roasting energy consumption is high, flow process is complicated.
Summary of the invention
The object of the invention is that the flow process that existing high-iron bauxite iron aluminium recovery process exists is complicated, the high deficiency of energy consumption in order to overcome, provide two sections of wet method stripping high ferro trihydrate aluminium stone ores of alkaline media of a kind of technical feasibility, economical rationality to extract respectively the novel method of aluminium and iron.
The object of the invention is to be achieved through the following technical solutions.
A kind of method that high iron gibbsite-type bauxite aluminium and iron extract, to adopt high efficiency extraction that two sections of wet method dissolving-out process of alkaline media realize aluminium and iron with separated, one section of stripping adopts the low alkali Bayer process of ripe low temperature to realize easily extraction and the commercialization of Aluminum component in bauxite, two sections of strippings adopt aluminium in the high-alkali one section of stripping slag of alkali lye stripping of high temperature and silicon to realize the enrichment of iron, the raw material that rich scum utilizes as follow-up iron resourcesization.The operating process that it is characterized in that the method comprises:
(a) high iron gibbsite-type bauxite is levigate to after granularity is below 74 microns, by bauxite and Na 2o concentration 80～250g/L, molecular ratio (MR, the mol ratio of sodium oxide and aluminum oxide) 2.0～4.0 sodium aluminate solution mixes, the liquid-solid ratio that sodium aluminate solution mixes with bauxite (volume mass ratio) is according to ingredients molecular ratio 1.3～1.8 conversions, mixed slurry is reacted to 5～120min under 80～150 ° of C, after finishing, reaction carries out while hot liquid-solid separation, solid phase is one section of stripping slag, and liquid phase is sodium aluminate concentrate solution;
(b), after step (a) finishes, the sodium aluminate concentrate solution that step (a) is obtained is adjusted Na 2o concentration, to 180g/L, and adopts decomposition of crystal seed method to plant minute, obtains the seed precipitation solution that aluminium hydroxide product and molecular ratio are 2.0～4.0, and seed precipitation solution is back to step (a) stripping high iron gibbsite-type bauxite again.
(c) after step (a) finishes, by one section of stripping slag and Na 2o concentration 300～500g/L, molecular ratio>=30 or≤1.7 sodium aluminate solution mixes according to liquid-solid ratio>=10, mixed slurry is placed in to autoclave pressure in 200～350 ° of C reaction 0.5～4h, after finishing, reaction carries out while hot liquid-solid separation, and wash solid phase, solid phase is the scum of iron enrichment, and liquid phase is two sections of dissolution fluids that dissolved aluminium and silicon in one section of stripping slag;
(d) after step (c) finishes, two sections of dissolution fluids are diluted to Na 2o concentration is 200～300g/L, and decrease temperature crystalline is separated out sodium aluminium silicate, or adds lime or calcium sulfate in 80～200 ° of C, to remove aluminium and the silicon of two sections of strippings in diluent, and after liquid-solid separation, liquid phase is evaporated to Na 2o concentration 300～500g/L returns to step (c), again dissolves one section of stripping slag, and solid phase is sodium aluminium silicate or calcium aluminium silicon compound.
Method of the present invention, is characterized in that the sodium aluminate solution Na for one section of stripping 2o concentration is that 80～250g/L, molecular ratio are 2.0～4.0, and sodium aluminate solution and high ferro trihydrate aluminium stone ore carry out hybrid reaction by ingredients molecular ratio 1.3～1.8.
Method of the present invention, is characterized in that the alkali lye Na for two sections of strippings 2o concentration be 300～500g/L, molecular ratio>=30 or≤1.7, and by liquid-solid ratio>=10, carry out hybrid reaction with one section of stripping slag.
Method of the present invention, the temperature that it is characterized in that two sections of strippings is 200～350 ° of C.
Method of the present invention, it is characterized in that need be by Na when two sections of dissolution fluids purifications remove aluminium and silicon 2o concentration dilution to 200～300g/L.
The method that in high iron gibbsite-type bauxite, aluminium and iron extract is the novel method that is fundamentally different from existing ferro-aluminum isolation technique.The method adopts two sections of wet method dissolving-out process of alkaline media, one section of process in leaching utilizes ripe Bayer process, the sodium aluminate solution that adopts low alkaline concentration is easy molten gibbsite in stripping high ferro trihydrate aluminium stone ore at low temperatures, and one section of dissolution fluid is extracted to an aluminium hydroxide product through planting to divide, seed precipitation solution returns to one section of stripping; Two sections of process in leaching are at one section of stripping slag of the high-alkali condition stripping of high temperature with the alkali lye of high molecule ratio or lower molecular ratio, realize the efficient stripping of aluminium and silicon in slag and realize separated with iron, after separated, obtain the rich scum solid phase of iron enrichment, liquid phase is returned to two sections of strippings after purifying.The coupling of two sections of process in leaching, can realize the extraction of aluminium and iron in high iron gibbsite-type bauxite.Technical process of the present invention is simple, and iron aluminium separating effect is remarkable, and the utilization of the high-iron bauxite resource of its application Jiang Wei China characteristic provides an effective means.
Accompanying drawing explanation
Fig. 1 is the present invention's process flow sheet applicatory.
Specific embodiments
Below by further setting forth in conjunction with the accompanying drawings and embodiments implementation process of the present invention and step.It should be understood that these embodiment are only for further illustrating experimental program of the present invention, rather than for limiting the present invention.
The present invention is applicable to processing high iron gibbsite-type bauxite, and raw ore composition used in embodiment is: Al 2o 339.9%, Fe 2o 328.9%, SiO 212.8%, and raw ore is levigate to below 74 microns.The composition of raw material high ferro trihydrate aluminium stone ore also can adopt other moiety and concrete content, and this can not be for limiting the scope of the invention.
Embodiment 1:
Configuration Na 2the sodium aluminate solution of O concentration 100g/L, molecular ratio 3.0, according to liquid-solid ratio (volume mass is than 7:1), high ferro trihydrate aluminium stone ore is mixed with sodium aluminate solution, now ingredients molecular ratio is 1.47, mixed slurry is reacted to 60min under 100 ° of C, reaction finishes to carry out while hot liquid-solid separation, and the one section of dissolution fluid obtaining does not need to adjust alkali concn and directly enters kind of an operation break-down extraction aluminium hydroxide; Configuration Na 2the sodium aluminate solution of O concentration 300g/L, molecular ratio 1.6, mixes with this sodium aluminate solution one section of stripping slag by liquid-solid ratio 20, and mixed slurry is placed in to autoclave pressure in 260 ° of C reaction 1h, after reaction finishes, carries out while hot liquid-solid separation, obtains Fe 2o 3content, up to 80.45% rich scum, is diluted to Na by two sections of dissolution fluids 2o concentration 200g/L, and decrease temperature crystalline separates out sodium aluminium silicate to purify two sections of dissolution fluids, two sections of dissolution fluid evaporation concentration after purification are to Na 2o concentration 300g/L cyclically utilizing is in two sections of strippings.Two sections of strippings of alkaline media have realized the extraction respectively of aluminium and iron in high ferro trihydrate aluminium stone ore.
Embodiment 2
Configuration Na 2the sodium aluminate solution of O concentration 250g/L, molecular ratio 4.0, according to liquid-solid ratio (volume mass ratio), 3:1 mixes high ferro trihydrate aluminium stone ore with sodium aluminate solution, now ingredients molecular ratio is 1.74, mixed slurry is reacted to 20min under 130 ° of C, reaction finishes to carry out while hot liquid-solid separation, and the one section of dissolution fluid obtaining is adjusted Na 2o concentration enters kind of an operation break-down extraction aluminium hydroxide after below 180g/L; Configuration Na 2the sodium aluminate solution of O concentration 400g/L, molecular ratio 60, mixes with this sodium aluminate solution one section of stripping slag by liquid-solid ratio 15, and mixed slurry is placed in to autoclave pressure in 300 ° of C reaction 2h, after reaction finishes, carries out while hot liquid-solid separation, obtains Fe 2o 3content is up to 87.32% rich scum; Two sections of dissolution fluids are diluted to Na 2o concentration 200g/L, and add calcium sulfate in 170 ° of C, to remove aluminium and the silicon of two sections of strippings, two sections of dissolution fluid evaporation concentration after purification are to Na 2o concentration 400g/L cyclically utilizing is in two sections of strippings.Two sections of strippings of alkaline media have realized the extraction respectively of aluminium and iron in high ferro trihydrate aluminium stone ore.
Embodiment 3
Configuration Na 2the sodium aluminate solution of O concentration 150g/L, molecular ratio 2.0, according to liquid-solid ratio (volume mass ratio), 10:1 mixes high ferro trihydrate aluminium stone ore with sodium aluminate solution, now ingredients molecular ratio is 1.51, mixed slurry is reacted to 120min under 90 ° of C, reaction finishes to carry out while hot liquid-solid separation, and the one section of dissolution fluid obtaining does not need to adjust alkali concn and directly enters kind of an operation break-down extraction aluminium hydroxide; Configuration Na 2the pure NaOH liquid of O concentration 300g/L (molecular ratio is infinitely great), mixes with this alkali lye one section of stripping slag by liquid-solid ratio 18, and mixed slurry is placed in to autoclave pressure in 350 ° of C reaction 4h, after reaction finishes, carries out while hot liquid-solid separation, obtains Fe 2o 3content is up to 85.40% rich scum; Two sections of dissolution fluids are diluted to Na 2o concentration 200g/L, and add lime in 150 ° of C, to remove aluminium and the silicon of two sections of strippings, two sections of dissolution fluid evaporation concentration after purification are to Na 2o concentration 300g/L cyclically utilizing is in two sections of strippings.Two sections of strippings of alkaline media have realized the extraction respectively of aluminium and iron in high ferro trihydrate aluminium stone ore.
Embodiment 4
Configuration Na 2the sodium aluminate solution of O concentration 200g/L, molecular ratio 3.0, according to liquid-solid ratio (volume mass ratio), 2.8:1 mixes high ferro trihydrate aluminium stone ore with sodium aluminate solution, now ingredients molecular ratio is 1.30, mixed slurry is reacted to 5min under 120 ° of C, reaction finishes to carry out while hot liquid-solid separation, and the one section of dissolution fluid obtaining is adjusted Na 2o concentration enters kind of an operation break-down extraction aluminium hydroxide after below 180g/L; Configuration Na 2the sodium aluminate solution of O concentration 500g/L, molecular ratio 30, mixes with this sodium aluminate solution one section of stripping slag by liquid-solid ratio 12, and mixed slurry is placed in to autoclave pressure in 280 ° of C reaction 0.5h, after reaction finishes, carries out while hot liquid-solid separation, obtains Fe 2o 3content is up to 89.31% rich scum; Two sections of dissolution fluids are diluted to Na 2o concentration 300g/L, and add lime in 200 ° of C, to remove aluminium and the silicon of two sections of strippings, two sections of dissolution fluid evaporation concentration after purification are to Na 2o concentration 500g/L cyclically utilizing is in two sections of strippings.Two sections of strippings of alkaline media have realized the extraction respectively of aluminium and iron in high ferro trihydrate aluminium stone ore.
Embodiment 5
Configuration Na 2the sodium aluminate solution of O concentration 100g/L, molecular ratio 3.5, according to liquid-solid ratio (volume mass ratio), 9:1 mixes high ferro trihydrate aluminium stone ore with sodium aluminate solution, now ingredients molecular ratio is 1.80, mixed slurry is reacted to 60min under 150 ° of C, reaction finishes to carry out while hot liquid-solid separation, and the one section of dissolution fluid obtaining does not need to adjust alkali concn and directly enters kind of an operation break-down extraction aluminium hydroxide; Configuration Na 2the pure NaOH liquid of O concentration 350g/L (molecular ratio infinitely great), by one section of stripping slag with this alkali lye by mixing by liquid-solid ratio 20, and mixed slurry is placed in to autoclave pressure in 260 ° of C reaction 3h, react after finishing and carry out while hot liquid-solid separation, obtain Fe 2o 3content is up to 78.62% rich scum; Two sections of dissolution fluids are diluted to Na 2o concentration 200g/L, and decrease temperature crystalline separates out sodium aluminium silicate to purify two sections of dissolution fluids, two sections of dissolution fluid evaporation concentration after purification are to Na 2o concentration 350g/L cyclically utilizing is in two sections of strippings.Two sections of strippings of alkaline media have realized the extraction respectively of aluminium and iron in high ferro trihydrate aluminium stone ore.

Claims (1)

1. the method that in high iron gibbsite-type bauxite, aluminium and iron extract, is characterized in that the operating process of the method comprises:
(a) high iron gibbsite-type bauxite is levigate to after below granularity 74 μ m, by bauxite and Na 2the sodium aluminate solution of O concentration 80～250g/L, the molecular ratio mol ratio of aluminum oxide (sodium oxide with) 2.0～4.0 mixes, the liquid-solid ratio that sodium aluminate solution mixes with bauxite (volume mass ratio) is according to ingredients molecular ratio 1.3～1.8 conversions, by mixed slurry hybrid reaction 5～120min under 80～150 ° of C, after reaction finishes, carry out while hot liquid-solid separation, obtain one section of stripping slag solid phase, sodium aluminate concentrate solution liquid phase;
(b), after step (a) finishes, the sodium aluminate concentrate solution that step (a) is obtained is adjusted Na 2o concentration, to 180g/L, and adopts decomposition of crystal seed method to plant minute, obtains the seed precipitation solution that aluminium hydroxide product and molecular ratio are 2.0～4.0, and seed precipitation solution is back to step (a) stripping bauxite again.
(c) after step (a) finishes, by one section of stripping slag and Na 2o concentration 300～500g/L, molecular ratio>=30 or≤1.7 sodium aluminate solution mixes according to liquid-solid ratio>=10, mixed slurry is placed in to autoclave pressure in 200～350 ° of C reaction 0.5～4h, after finishing, reaction carries out while hot liquid-solid separation, the scum that obtains iron enrichment after hot wash for solid phase, liquid phase is two sections of dissolution fluids that dissolved aluminium and silicon in one section of stripping slag;
(d) after step (c) finishes, two sections of dissolution fluids are diluted to Na 2o concentration 200～300g/L, then decrease temperature crystalline separates out sodium aluminium silicate, or add lime or calcium sulfate in 150～200 ° of C, to remove aluminium and the silicon of two sections of strippings in diluent, after liquid-solid separation, liquid phase is evaporated to Na 2o concentration 300～500g/L returns to step (c), again dissolves one section of stripping slag, and solid phase is sodium aluminium silicate or calcium aluminium white residue.
CN201310109143.1A 2013-03-29 2013-03-29 Method for extracting aluminum and iron from high iron gibbsite-type bauxite Pending CN104073651A (en)

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CN106145169A (en) * 2015-04-09 2016-11-23 中国科学院过程工程研究所 A kind of method of wet underwater welding aluminium oxide from aluminous fly-ash
CN108754499A (en) * 2018-07-03 2018-11-06 贵州大学 A kind of technique of relieving haperacidity coproduction metal-polishing liquid
CN109382213A (en) * 2017-08-10 2019-02-26 中国铝业股份有限公司 A kind of beneficiation method of gibbsitic bauxite
CN114212809A (en) * 2021-11-29 2022-03-22 冯圣生 Novel process for recovering aluminum oxide and ferric oxide by low-temperature digestion of red mud

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CN102502733A (en) * 2011-10-26 2012-06-20 中国铝业股份有限公司 Method for treating gibbsite by using high-concentration alkali liquor under normal pressure
CN102826577A (en) * 2011-06-13 2012-12-19 长沙瑞德新材料科技发展有限公司 Two-stage digestion process of boehmite-gibbsite hybrid bauxite

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CN1405090A (en) * 2002-11-12 2003-03-26 中国铝业股份有限公司 Bayer production method for aluminium oxide
CN102398914A (en) * 2010-09-10 2012-04-04 中国科学院过程工程研究所 Method for modifying Bayer process, processing low-grade diaspore bauxite and producing alumina
CN102009990A (en) * 2010-12-15 2011-04-13 中国铝业股份有限公司 Method for leaching bauxite ore pulp
CN102826577A (en) * 2011-06-13 2012-12-19 长沙瑞德新材料科技发展有限公司 Two-stage digestion process of boehmite-gibbsite hybrid bauxite
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106145169A (en) * 2015-04-09 2016-11-23 中国科学院过程工程研究所 A kind of method of wet underwater welding aluminium oxide from aluminous fly-ash
CN106145169B (en) * 2015-04-09 2018-02-13 中国科学院过程工程研究所 A kind of method of the wet underwater welding aluminum oxide from aluminous fly-ash
CN109382213A (en) * 2017-08-10 2019-02-26 中国铝业股份有限公司 A kind of beneficiation method of gibbsitic bauxite
CN109382213B (en) * 2017-08-10 2021-07-20 中国铝业股份有限公司 Ore dressing method for gibbsite type bauxite
CN108754499A (en) * 2018-07-03 2018-11-06 贵州大学 A kind of technique of relieving haperacidity coproduction metal-polishing liquid
CN114212809A (en) * 2021-11-29 2022-03-22 冯圣生 Novel process for recovering aluminum oxide and ferric oxide by low-temperature digestion of red mud

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Application publication date: 20141001