CN107244683A - The method that the hot method processing Bayer process red mud of the step alkali of andradite one produces sodium aluminate - Google Patents
The method that the hot method processing Bayer process red mud of the step alkali of andradite one produces sodium aluminate Download PDFInfo
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- CN107244683A CN107244683A CN201710487195.0A CN201710487195A CN107244683A CN 107244683 A CN107244683 A CN 107244683A CN 201710487195 A CN201710487195 A CN 201710487195A CN 107244683 A CN107244683 A CN 107244683A
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- sodium aluminate
- red mud
- alkali
- andradite
- bayer process
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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
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- 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
- C01B33/20—Silicates
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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
- C01F7/06—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
- C01F7/066—Treatment of the separated residue
Abstract
The present invention relates to the method that a kind of hot method processing Bayer process red mud of step alkali of andradite one produces sodium aluminate, comprise the steps, S1：Red mud, sodium ferrite or calcium ferrite, active lime and circulating mother liquor are prepared by mixing into raw material ore pulp；S2：Raw material ore pulp is subjected to alkali thermosol and goes out reaction, reaction obtains dissolved mineral slurry after terminating；S3：Dissolved mineral slurry dilution is obtained into dilution, dilution is subjected to solid-liquor separation, dissolution slag and dissolution fluid is obtained；S4：Add seeded crystallization and separation of solid and liquid after dissolution fluid is evaporated, obtain solid sodium aluminate and high molecule ratio sodium aluminate solution；S5：The high molecule ratio sodium aluminate solution is modulated, circulating mother liquor used in step S1 is made.The aluminum oxide and sodium oxide molybdena in red mud have been reclaimed by the method for the present invention, the alkali content in dissolution slag is set to be reduced to less than 0.5%, it can be used as the raw materials such as cement, concrete, ironmaking binding agent, the method can be with large red mud of dissolving, the recycling of red mud is realized, the effect of resource green utilization has been reached.
Description
Technical field
The invention belongs to the technical field of sodium aluminate production, and in particular to a kind of hot method processing Bayer of the step alkali of andradite one
The method that method red mud produces sodium aluminate.
Background technology
Red mud is the waste residue that aluminum oxide is produced in process of production, is taken on a red color because containing a large amount of iron oxide, therefore be referred to as
Red mud.The quantum of output of red mud, because the grade of ore, production method, technical merit and it is different.China often produces 1t aluminum oxide, along with
1.0~1.7t red mud will be produced, the red mud stored up is accumulated at present more than 300,000,000 tons.Substantial amounts of red mud can not obtain effective profit
With, it can only be stacked by the stockyard of large area, not only occupy a large amount of soils, simultaneously as the high alkalinity of red mud, also to environment
Cause severe contamination.By the end of 2016, add up volume of cargo in storage up to more than 400,000,000 tons, as a big environmentally friendly hidden danger.
Because the production method of aluminum oxide is different, its red mud composition produced, property, thing are mutually different.What Bayer process was produced
Alkali metal content is high in red mud；The red mud CaO content that sintering process and combination method are produced is high, and alkali and iron content are relatively low.This species diversity
Determine the distinct methods that red mud is utilized.Domestic and foreign scholars have carried out a large amount of fruitful grind in terms of the comprehensive utilization of red mud
Study carefully, it is main to include two aspects：One is to extract the useful constituent in red mud, reclaims high-valency metal, such as reclaims iron oxide, oxidation
Aluminium, sodium oxide molybdena, silica, calcium oxide, zinc oxide etc..Two be to be used to red mud as raw material manufacture low value-added Building wood
Material, such as does materials for wall, cement, devitrified glass.But it is due to that alkali content in red mud is higher, is unfavorable for red mud in Building wood
Application in material.In recent years, many R＆D institutions are directed in the exploitation of utility recovery technology in red mud, especially red mud
The recovery of aluminium and alkali.Under the background of China's bauxite resource shortage, how to realize that carrying out recovery to the valuable element in red mud has
Important realistic meaning, has broad application prospects.
Mainly there are flotation, the technique such as lime sinter process and leaching on reclaiming the method for aluminium from red mud at present.Model pioneer
Et al. Research on Flotation has been carried out to Bayer process red mud.Small-sized closed circuit float test shows, can abandon 45.74% it is red
Mud, the Al of recovery 65.52%2O3, wherein alumina silica ratio accounts for 62.01% for 7.53, can directly return to Bayer process molten leaching, and aluminium silicon
Account for 2.86% than 4.78, can as sintering process raw material.Zhou Qiusheng etc. is reclaimed using sintering process processing Bayer process iron red mud
Al in aluminum oxide therein, clinker2O3The rate of recovery is up to 85%~90%.Shandong Guilin etc. have studied using salt Ore Leaching red mud
In aluminum oxide technique, using it is secondary leach, wherein the leaching rate of aluminum oxide is up to 89.0%.Zheng Xiufang is sintered with soda lime
Bayer process red mud and silica residue in sinter process that method processing bubble is closed, aluminum oxide and sodium oxide molybdena dissolution rate are respectively greater than 95% and 97%.
Method on red mud dealkalization mainly has lime dealkalize method, water elution alkaline process, salt dealkalize method, suspension and carbonation dealkalize
Method, lime-sulfuric acid joint dealkalize method and other new dealkalization methods, such as ionic membrane dealkalize method, bacterium dealkalize method and pyrogenic process take off
Alkali.However, the problem of above-mentioned dealkalization method has different degrees of, lime dealkalize method effect is undesirable and in high pressure at ambient pressure
Under then cost it is higher；WATER-WASHING METHOD removal efficiency is relatively low, is only capable of washing off attachment alkali and invalid to combining alkali；Magnesium chloride and ammonium chloride are de-
Chlorion meeting etching apparatus in alkaline process is unfavorable for the application of follow-up red mud；CO2Suspension dealkalization method, CO therein2Only to red mud
In Na2O·Al2O3、Na2SiO3And Na2CO3Work, but to Na2O·Al2O3·1.7SiO2·nH2O does not work, and red
Most sodium is with Na in mud2O·Al2O3·1.7SiO2·nH2O form is present, therefore this method removal efficiency is not high；
In the sulfuric acid joint dealkalize method of lime one, acid system and alkaline process are simultaneously deposited, and are easily wasted raw material, while technique is more complicated, and have been used high pressure
Kettle, cost is higher.
The content of the invention
(1) technical problem to be solved
In order to solve the above problems, it is an object of the invention to provide a kind of hot method processing Bayer process of step alkali of andradite one
The method that red mud produces sodium aluminate, using a hot method of step alkali, the red mud that aluminum oxide industry is produced is as raw material, with sodium ferrite
High temperature dissolution after the mixing of (or calcium ferrite) and active lime, makes the aluminium and sodium in red mud enter solution with aluminic acid na form, and silicon,
Iron and calcium in the form of andradite to stay in dissolution slag.The method of the present invention has reclaimed the aluminum oxide in red mud, realizes solid
The recycling of body discarded object, has reached the effect of resource green utilization.
(2) technical scheme
In order to achieve the above object, the main technical schemes that the present invention is used include：
A kind of method that hot method processing Bayer process red mud of the step alkali of andradite one produces sodium aluminate, comprises the steps,
S1：Red mud, sodium ferrite (or calcium ferrite), active lime and circulating mother liquor are prepared by mixing into raw material ore pulp；
S2：Raw material ore pulp is subjected to alkali thermosol and goes out reaction, reaction obtains dissolved mineral slurry after terminating；
S3：Dissolved mineral slurry dilution is obtained into dilution, dilution is subjected to solid-liquor separation, dissolution slag and dissolution fluid is obtained,
Wherein dissolution fluid is sodium aluminate solution；
S4：After sodium aluminate solution is evaporated, plus seeded crystallization and separation of solid and liquid, obtain sodium aluminate solid and high molecule ratio aluminium
Acid sodium solution；
S5：The high molecule ratio sodium aluminate solution is modulated, circulating mother liquor used in step S1 is made.
Preferably, in red mud, sodium ferrite (or calcium ferrite), the raw material ore pulp of active lime composition, what each form was present
Iron, aluminium, calcium, silicon total amount are respectively in terms of oxide, and batch formula is as follows：
The mol ratio of the total amount of iron oxide and the total amount of aluminum oxide is 0.5~1.5：1
The mol ratio of the total amount of calcium oxide and the total amount of silica is 1~3：1
Preferably, the liquid-solid ratio of the raw material ore pulp is 2~5：1.
Preferably, high molecule ratio sodium aluminate solution described in step S5 obtains circulating mother liquor after carrying out severe alkali concn modulation,
Wherein, the severe alkali concn in circulating mother liquor is 150~250g/L, and molecular proportion is 5~25.
Preferably, the temperature that dissolution is reacted in step S2 is 150~250 DEG C, and the reaction time is 0.5~2h.
Preferably, methods described also includes：
Step S6：Dissolution slag in step S3 is carried out to wash and separation of solid and liquid, andradite type slag and cleaning solution is obtained；
Step S7：The cleaning solution is used to dilute the dissolved mineral slurry in step S3.
Preferably, step S4 specifically includes following step：
S41：Crystal seed is added in the sodium aluminate solution after evaporation and crystallized, slurry is obtained；
S42：Slurry is subjected to solid-liquor separation, high molecule ratio sodium aluminate solution and sodium aluminate is obtained.
Preferably, the crystallization temperature in step S41 is 85~40 DEG C, and crystallization time is 10~30h, and seed load is 10
~200g/L.
Preferably, the sodium ferrite in step S1 is that iron-bearing material is formed with industrial carbon alkaline sintering；Calcium ferrite is iron-bearing material
Formed with lime sintering.
(3) beneficial effect
The method of the present invention has reclaimed aluminum oxide and sodium oxide molybdena in red mud, is reduced to the alkali content in dissolution slag
Less than 0.5%, the main component of dissolution slag is andradite, and this alkali-free andradite is adapted to the calcium ferrite addition of steelmaking process
Agent, the preferable aggregate for doing the strong concrete such as seif-citing rate, high intensity, rapid hardening portland cement and highway, airfield runway,
It is also potential raw material of the added values such as devitrified glass, siliceous fertilizer compared with high product, the method large to red mud progress can be dissolved, be realized
Recycling to red mud, has reached the effect of resource green utilization；Product sodium aluminate can individually make reagent and be used for preparing it
His aluminum-containing products, also by simple Bayer process can prepare metallurgical-grade aluminum oxide as raw material.
Brief description of the drawings
Fig. 1 is the technological process that the hot method processing Bayer process red mud of the step alkali of andradite one of the present invention produces sodium aluminate method
Figure.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate this hair
It is bright, rather than limitation the scope of the present invention.
Red mud used in the embodiment of the present invention is to contain aluminum oxide and silica in Bayer process red mud, red mud.Red mud, iron
In the Raw Ore of sour sodium (or calcium ferrite) and lime composition, the mol ratio hereinafter abbreviated as F/A of total ferric oxide and total aluminum oxide；
The mol ratio hereinafter abbreviated as C/S of total calcium oxide and total silica；Raw material pulp slurry stereoplasm amount is than hereinafter abbreviated as L/S.
The method that the hot method processing Bayer process red mud of the step alkali of andradite one produces sodium aluminate, it is andradite to refer to dissolution slag
Type slag, a hot method of step alkali refers to the method for carrying out step hydro-thermal dissolution processing to aluminum oxide using alkali lye (circulating mother liquor), production
Target product be sodium aluminate.
Embodiment 1
The present embodiment uses diaspore Bayer process red mud, and main chemical compositions (mass percent, wt%) are：Aluminum oxide
(Al2O3) 21.62%, silica (SiO2) 16.11%, sodium oxide molybdena (Na2O) 7.08%, calcium oxide (CaO) 16.50%, entirely
Iron (TFe) 14.80%, its alumina silica ratio is 1.34；
Sodium ferrite is that iron-bearing material is formed with industrial caustic soda sintering；
Severe alkali concn in circulating mother liquor is 240g/L, and molecular proportion is 25；
F/A=0.6：1；
C/S=2.5：1.
The side of sodium aluminate is produced according to the hot method processing Bayer process red mud of the step alkali of andradite of the present invention one shown in this Fig. 1
Method：
S1：After red mud, sodium ferrite and active lime are mixed, according to L/S=4:1 ratio is mixed with circulating mother liquor
Into raw material slurry；
S2：Raw material ore pulp is subjected to alkali thermosol and goes out reaction, dissolution reaction temperature is 250 DEG C, and the dissolution reaction time is 1h, instead
Dissolved mineral slurry is obtained after should terminating；
S3：Dissolved mineral slurry dilution is obtained into dilution, dilution is subjected to solid-liquor separation, dissolution slag and dissolution fluid is obtained,
Wherein dissolution fluid is sodium aluminate solution；
S41：10g/L crystal seeds are added in the sodium aluminate solution after evaporation, and crystallization is evaporated at 85~40 DEG C
15h, obtains slurry；
S42：Slurry is subjected to solid-liquor separation, high molecule ratio sodium aluminate solution and solid sodium aluminate is obtained；
S5：The high molecule ratio sodium aluminate solution is modulated, circulating mother liquor used in step S1 is made；
Severe alkali concn and molecular proportion in the high molecule ratio sodium aluminate solution produced in this step are both needed to adjustment and followed with reaching
The parameter request of ring mother liquor, starches for preparation raw material and carries out dissolution reaction；
S6：Dissolution slag in step S3 is carried out to wash and separation of solid and liquid, andradite type dissolution slag and cleaning solution is obtained；
In this step, alkali-free andradite type slag has been obtained by processing, make silicon in raw material red mud and the iron that adds and
Calcium in the form of andradite to stay in dissolution slag, and alkali content is down to less than 0.5% in andradite type slag, and alumina silica ratio is down to
0.5.The aluminum oxide and sodium oxide molybdena in red mud have not only been reclaimed, has also caused alkali-free andradite type slag because the reduction of alkali content is obtained
Effective utilization, is such as used for the ferrous acid calcium additive of steelmaking process, does seif-citing rate, high intensity, rapid hardening portland cement and high speed
The preferable aggregate of the strong concretes such as highway, airfield runway, and as added values such as devitrified glass, siliceous fertilizers compared with high product
Potential raw material；
S7：Cleaning solution is used to dilute the dissolved mineral slurry in step S3；
The cleaning solution produced in this step is waste liquid, but cleaning solution is returned to for diluting dissolved mineral slurry in step S3,
Both the processing and discharge of waste liquid had been reduced, the effect of recycling has been reached again, the recycling of material has been reached.
Obtained sodium aluminate as product.Slag is filtered out for alkali-free andradite type slag, rest materials realize circulation profit
With, meet resource greenization comprehensive utilization requirement.
Embodiment 2
The present embodiment uses Bayer process red mud, and main chemical compositions (mass percent, wt%) are：Aluminum oxide (Al2O3)
23.35%, silica (SiO2) 23.23%, sodium oxide molybdena (Na2O) 15.61%, calcium oxide (CaO) 0.51%, full iron (TFe)
16.16%, titanium dioxide (TiO2) 5.37%, its alumina silica ratio is 1.01；
Calcium ferrite is that iron-bearing material is formed with lime sintering；
Severe alkali concn in circulating mother liquor is 240g/L, and molecular proportion is 25；
F/A=0.5：1；
C/S=3：1.
The side of sodium aluminate is produced according to the hot method processing Bayer process red mud of the step alkali of andradite of the present invention one shown in this Fig. 1
Method：
S1：After red mud, sodium ferrite and lime are mixed, according to L/S=5:1 ratio is prepared by mixing into original with circulating mother liquor
Slurry (notes：The iron contained in red mud is not counted in the calcium oxide contained in formula, red mud and is included in formula, while should when matching somebody with somebody lime
In view of the TiO in raw material2The influence of calcium titanate is generated with lime reaction)；
S2：Raw material ore pulp is subjected to dissolution reaction in a kettle., dissolution reaction temperature is 250 DEG C, dissolution reaction time
For 1h, reaction obtains dissolved mineral slurry after terminating；
Dissolution reaction by this step, alumina extraction ratio can reach more than 80%；
S3：Dissolved mineral slurry dilution is obtained into dilution, dilution is subjected to solid-liquor separation, dissolution slag and dissolution fluid is obtained,
Wherein dissolution fluid is lower molecular ratio sodium aluminate solution；
S41：50g/L crystal seeds are added in the lower molecular ratio sodium aluminate solution after evaporation, and tied at 85~40 DEG C
Brilliant 10h, obtains slurry；
S42：Slurry is subjected to solid-liquor separation, high molecule ratio sodium aluminate solution and sodium aluminate is obtained；
S5：The high molecule ratio sodium aluminate solution is modulated, circulating mother liquor used in step S1 is made；
Severe alkali concn and molecular proportion in the high molecule ratio sodium aluminate solution produced in this step are both needed to adjustment and followed with reaching
The parameter request of ring mother liquor, starches for preparation raw material and carries out dissolution reaction；
S6：Dissolution slag in step S3 is carried out to wash and separation of solid and liquid, andradite type slag and cleaning solution is obtained；
In this step, alkali-free andradite type red mud slag has been obtained by processing, make silicon in red mud and the iron that adds and
Calcium in the form of andradite to stay in dissolution slag, and sodium content is down to 0.11% in skigite type red mud slag, and alumina silica ratio is down to
0.5.The alkali content in red mud is not only reduced, also causes alkali-free andradite type red mud slag because the reduction of alkali content is had
Effect utilize, such as be used for steelmaking process ferrous acid calcium additive, do seif-citing rate, high intensity, rapid hardening portland cement and highway,
The preferable aggregate of the strong concretes such as airfield runway, and it is potential compared with high product as added values such as devitrified glass, siliceous fertilizers
Raw material；
S7：Cleaning solution is used to dilute the dissolved mineral slurry in step S3；
The cleaning solution produced in this step is waste liquid, but cleaning solution is returned to for diluting dissolved mineral slurry in step S3,
Both the processing and discharge of waste liquid had been reduced, the effect of recycling has been reached again, the recycling of material has been reached.
Obtained sodium aluminate as product.Slag is filtered out for alkali-free andradite type red mud slag, rest materials are realized and followed
Ring is utilized, and meets the requirement of resource greenization comprehensive utilization.
The method of the present invention has not only reclaimed the aluminum oxide in red mud, also reduces the alkali content in red mud, realizes solid
The recycling of body discarded object, has reached the effect of resource green utilization.
Finally it should be noted that：Above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in previous embodiment, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or substitutions, the essence of appropriate technical solution is departed from various embodiments of the present invention technical side
The scope of case.
Claims (9)
1. a kind of method that hot method processing Bayer process red mud of the step alkali of andradite one produces sodium aluminate, it is characterised in that：Including under
State step,
S1：Red mud, sodium ferrite or calcium ferrite, active lime and circulating mother liquor are prepared by mixing into raw material ore pulp；
S2：Raw material ore pulp is subjected to alkali thermosol and goes out reaction, reaction obtains dissolved mineral slurry after terminating；
S3：Dissolved mineral slurry dilution is obtained into dilution, dilution is subjected to solid-liquor separation, dissolution slag and dissolution fluid is obtained, wherein
Dissolution fluid is sodium aluminate solution；
S4：Add seeded crystallization after sodium aluminate solution is evaporated, separation of solid and liquid obtains sodium aluminate solid and high molecule ratio sodium aluminate solution
Liquid；
S5：The high molecule ratio sodium aluminate solution is modulated, circulating mother liquor used in step S1 is made.
2. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：In red mud, sodium ferrite or calcium ferrite, the raw material ore pulp of active lime composition, iron, aluminium, calcium, the silicon of each form presence
Total amount is respectively in terms of oxide, and batch formula is as follows：
The mol ratio of the total amount of iron oxide and the total amount of aluminum oxide is 0.5~1.5：1；
The mol ratio of the total amount of calcium oxide and the total amount of silica is 1~3：1.
3. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：The liquid-solid ratio of the raw material ore pulp is 2~5：1.
4. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：High molecule ratio sodium aluminate solution described in step S5 obtains circulating mother liquor after carrying out severe alkali concn modulation, wherein, follow
Severe alkali concn in ring mother liquor is 150~250g/L, and molecular proportion is 5~25.
5. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：The temperature that dissolution is reacted in step S2 is 150~250 DEG C, and the reaction time is 0.5~2h.
6. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：Methods described also includes：
Step S6：Dissolution slag in step S3 is carried out to wash and separation of solid and liquid, andradite type slag and cleaning solution is obtained；
Step S7：The cleaning solution is used to dilute the dissolved mineral slurry in step S3.
7. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：Step S4 specifically includes following step：
S41：Crystal seed is added in the sodium aluminate solution after evaporation and crystallized, slurry is obtained；
S42：Slurry is subjected to solid-liquor separation, high molecule ratio sodium aluminate solution and solid sodium aluminate is obtained.
8. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 7 produces sodium aluminate, its
It is characterised by：Crystallization temperature in step S41 is 85~40 DEG C, and crystallization time is 10~30h, and seed load is 10-200g/
L。
9. the method that the hot method processing Bayer process red mud of the step alkali of andradite one according to claim 1 produces sodium aluminate, its
It is characterised by：Sodium ferrite in step S1 is that iron-bearing material is formed with industrial carbon alkaline sintering；Calcium ferrite is iron-bearing material and lime
Sintering is formed.
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| PCT/CN2018/092427 WO2018233690A1 (en) | 2017-06-23 | 2018-06-22 | Method for preparing sodium aluminate by treating bayer red mud by using one-step alkali heat process of andradite |
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| CN107857285A (en) * | 2017-12-01 | 2018-03-30 | 东北大学设计研究院（有限公司） | A kind of method that aluminic acid sodium crystal is produced using low-grade aluminum-containing raw material |
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| WO2018233690A1 (en) * | 2017-06-23 | 2018-12-27 | 东北大学 | Method for preparing sodium aluminate by treating bayer red mud by using one-step alkali heat process of andradite |
| CN109179463A (en) * | 2018-11-07 | 2019-01-11 | 沈阳工业大学 | A kind of method of Bayer-red mud alkali soluble tandem process processing bauxite resource |
| CN109437217A (en) * | 2018-10-30 | 2019-03-08 | 东北大学设计研究院（有限公司） | A kind of method of red mud processing and alumina producing |
| CN110803717A (en) * | 2019-10-17 | 2020-02-18 | 东北大学 | Method for carrying out reduction pre-magnetization on calcium iron garnet hydrate based on aqueous solution |
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| CN101117230A (en) * | 2007-07-12 | 2008-02-06 | 中国铝业股份有限公司 | Bayer process dissolving-out method |
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| CN101054626A (en) * | 2007-05-31 | 2007-10-17 | 中国铝业股份有限公司 | Stripping method for diasporite type bauxite |
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