CN104649304A - Alkaline aluminum extraction and dealkalized red mud obtaining method and dealkalized red mud obtained and application of dealkalized red mud - Google Patents
Alkaline aluminum extraction and dealkalized red mud obtaining method and dealkalized red mud obtained and application of dealkalized red mud Download PDFInfo
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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
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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- C01B33/22—Magnesium silicates
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Abstract
The invention discloses an alkaline aluminum extraction and dealkalized red mud obtaining method, which comprises the following steps: (1) raw materials including an aluminiferous raw material, a sodium oxide precursor, a magnesium oxide precursor and an optional calcium oxide precursor are prepared according to a raw material formula; (2) the raw materials are roasted at 800-1300 DEG C to obtain a sintered clinker; (3) the sintered clinker undergoes dissolution and solid-liquid separation to obtain red mud and a digested liquor; (4) the digested liquor undergoes desilicication and carbonating disintergration so as to obtain aluminium hydroxide; and (5) the red mud is dealkalized to obtain the dealkalized red mud containing magnesium silicate, wherein the raw material formula satisfies that molar ratio of the components oxides ([MgO]+[CaO])/([SiO2]+[TiO2]) is 0.9-1.1. The invention also discloses dealkalized red mud obtained by the above method and an application of the dealkalized red mud. By the method provided by the invention, high standard dissolution rate of aluminium oxide can be maintained, and added value of aluminum extraction is high.
Description
Technical field
The present invention relates to a kind of alkaline process and put forward the method obtaining dealkalize red mud in aluminium process, and the method obtain dealkalize red mud and application.
Background technology
Aluminum oxide alkaline process is produced, and historical origin for a long time, is mainly divided into Bayer process, sintering process and integrated processes thereof.
Sodium carbonate sintering process was proposed the earliest in 1858, and because alkaline consumption is large, aluminum oxide poor quality, the reasons such as the complicated and thermal losses of flow process is large, have just been eliminated after Bayer process appearance in 1889.It is found that after 1880 and mix burning aluminum-containing raw material by a certain percentage with Wingdale and sodium carbonate, alkaline consumption can being reduced and improve alumina extraction ratio, through further developing, defining traditional soda-lime sintering process.When processing high-silica diaspore ore, soda-lime sintering process is more superior than Bayer process.Have also appeared limestone sintering process in the 1950's, produce aluminum oxide and cement with aluminous fly-ash.Because resource limit, China carries in the exploitation of aluminium technique at sintering and have also been made extensive work, and traditional soda-lime sintering process Technology has reached current optimum level.In addition, for the feature of china natural resources natural endowment, also developed rich ore sintering process.Recently, in patent CN102107895A, also proposed a kind of improvement soda-lime sintering process, compared with traditional method, in minimizing supplies consumption and solid emission, all achieve marked improvement.
At the soda-lime sintering process of China's alumina industry widespread use, its basic recipe is: in mole, [Na
2o]/([Al
2o
3]+[Fe
2o
3]) ≈ 1.0, [CaO]/([SiO
2]+0.5 × [TiO
2]) ≈ 2.0.In sintering process, the aluminum oxide in aluminum-containing raw material, ferric oxide and sodium carbonate generate sodium aluminate (Na respectively
2oAl
2o
3) and sodium ferrite (Na
2oFe
2o
3), silicon-dioxide and calcium oxide generate Dicalcium Phosphate (Feed Grade) (2CaOSiO
2), titanium dioxide and calcium oxide generate calcium titanate (CaOTiO
2).In process in leaching, sodium aluminate enters solution, obtains the leach liquor being applicable to carrying aluminium.The improvement soda-lime sintering process proposed in patent CN102107895A, its basic recipe is: in mole, ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=1.0 ± 0.1, [CaO]/([SiO
2]+[TiO
2])=1.0 ± 0.1.In sintering process, the aluminum oxide in aluminum-containing raw material, ferric oxide and sodium carbonate generate sodium aluminate (Na respectively
2oAl
2o
3) and sodium ferrite (Na
2oFe
2o
3), silicon-dioxide and calcium oxide generate Calucium Silicate powder disodium (Na
2oCaOSiO
2), titanium dioxide and calcium oxide generate calcium titanate (CaOTiO
2).In process in leaching, sodium aluminate enters solution, obtains the leach liquor being applicable to carrying aluminium.Calucium Silicate powder (CaOSiO is obtained after the dealkalize of Calucium Silicate powder disodium
2).Compared with traditional soda lime sintering process, the addition of improvement soda-lime sintering process expendable material lime reduces half, and solid emission red mud is corresponding minimizing also.In addition, the maturing temperature of grog is also reduced to 1000-1200 DEG C from more than 1200-1300 DEG C.Conventional limestone sintering process is that the red mud quantum of output of main component is large with Dicalcium Phosphate (Feed Grade), can as the raw material of cement, and added value is lower, and market is dissolved difficult.Improvement soda-lime sintering process is that the red mud quantum of output of main component reduces relatively with Calucium Silicate powder, as light wall material and paper making raw material, can have certain added value.
But no matter be traditional soda-lime sintering process, or improvement soda-lime sintering process, and aforesaid limestone sintering process and rich ore sintering process, all will consume a large amount of expendable materials, and solid emission amount is large, added value is low.
Summary of the invention
The object of the invention is to carry a large amount of expendable material of aluminium consumption to overcome in prior art, and solid emission amount is large, the defect that added value is low, provides a kind of alkaline process to carry aluminium and obtaining the method for dealkalize red mud, and the dealkalize red mud obtained and application thereof.
The present inventor surprisingly finds under study for action, replace part or all of calcium oxide presoma to carry out roasting with magnesium oxide presoma and carry aluminium, can when keeping higher oxygen aluminium standard solubility rate, the very big amount of reduction expendable material and the amount of solid emission, and take Magnesium Silicate q-agent as the dealkalize red mud of main component, also can be used for producing the high value added product such as fibrous magnesium silicate and heat preserving and insulating material, greatly can improve the added value of aluminium.
In addition, carrying in aluminium process in the sintering process of process aluminum-containing raw material, is maximum by the energy consumption of raw material roasting ripe material.The present inventor finds through lot of experiments, replaces part or all of calcium oxide presoma to carry out roasting carry aluminium with magnesium oxide presoma, in saving energy consumption, also have very large advantage.When magnesiumcarbonate substitutes calcium carbonate completely, roasting generates in the process of oxide compound and can save energy more than 30%, maturing temperature also can reduce by more than 200 degree than existing sintering process simultaneously, significantly reducing further of energy consumption will be brought, and reduce the thermal requirements of sinter process, more cheap refractory materials can be adopted.
Therefore, to achieve these goals, on the one hand, the invention provides a kind of method that alkaline process is carried aluminium and obtained dealkalize red mud, described method comprises:
(1) prepare raw material according to raw mix formula, described raw material comprise aluminum-containing raw material, sodium oxide presoma and magnesium oxide presoma, and optional calcium oxide presoma;
(2) described raw material are carried out roasting at 800-1300 DEG C, obtain sintered clinker;
(3) described sintered clinker is obtained red mud and dissolution fluid through stripping, solid-liquid separation;
(4) described dissolution fluid carried out desiliconization, after carbon divides, obtain aluminium hydroxide;
(5) described red mud is carried out dealkalize, obtain the dealkalize red mud containing Magnesium Silicate q-agent;
Wherein, described raw mix formula meets the mol ratio of its component oxide for ([MgO]+[CaO])/([SiO
2]+[TiO
2])=0.9-1.1.
Preferably, in step (1), described raw mix formula meets the mol ratio of its component oxide for [MgO]/([MgO]+[CaO])=0.1-1.0.
Preferably, in step (1), the consumption of aluminum-containing raw material, sodium oxide presoma and magnesium oxide presoma and optional calcium oxide presoma makes the raw mix formula be mixed to get also meet the mol ratio of its component oxide for ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=0.9-1.1.
Preferably, when the mol ratio that described raw mix formula meets its component oxide is for [MgO]/([MgO]+[CaO])=0.5-1.0, in step (2), maturing temperature is 800-1200 DEG C, is more preferably 850-1050 DEG C; When the mol ratio that described raw mix formula meets its component oxide is for [MgO]/([MgO]+[CaO])=0.1-0.5, in step (2), maturing temperature is 900-1300 DEG C, is more preferably 950-1150 DEG C.
Second aspect, the invention provides the dealkalize red mud obtained by method as above.
The third aspect, the invention provides dealkalize red mud as above and is preparing the application in fibrous magnesium silicate, heat preserving and insulating material and goods.
The inventive method can when keeping higher oxygen aluminium standard solubility rate, the very big amount of reduction expendable material and the amount of solid emission, and take Magnesium Silicate q-agent as the dealkalize red mud of main component, also can be used for producing the high value added product such as fibrous magnesium silicate and heat preserving and insulating material, greatly can improve the added value of aluminium.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
On the one hand, the invention provides a kind of method that alkaline process is carried aluminium and obtained dealkalize red mud, the method comprises:
(1) prepare raw material according to raw mix formula, raw material comprise aluminum-containing raw material, sodium oxide presoma and magnesium oxide presoma, and optional calcium oxide presoma;
(2) raw material are carried out roasting at 800-1300 DEG C, obtain sintered clinker;
(3) sintered clinker is obtained red mud and dissolution fluid through stripping, solid-liquid separation;
(4) dissolution fluid carried out desiliconization, after carbon divides, obtain aluminium hydroxide;
(5) red mud is carried out dealkalize, obtain the dealkalize red mud containing Magnesium Silicate q-agent;
Wherein, raw mix formula meets the mol ratio of its component oxide for ([MgO]+[CaO])/([SiO
2]+[TiO
2])=0.9-1.1.
It will be understood by those skilled in the art that the silicon-dioxide in above-mentioned formula and the titanium dioxide generally main composition coming from aluminum-containing raw material itself.Magnesium oxide in above-mentioned formula and calcium oxide, general small part comes from the composition of aluminum-containing raw material itself, and major part comes from the magnesium oxide presoma and calcium oxide presoma that add in step (1) respectively.
In above-mentioned formula of the present invention, for the mol ratio of magnesium oxide and calcium oxide without particular requirement, as long as entirety meets above-mentioned formula, can according to the purposes of red mud and dealkalize red mud, calcium oxide and/or magnesian ratio are suitably adjusted, such as, [MgO]/([MgO]+[CaO])=0.1-1.0.
In step of the present invention (1), the consumption of aluminum-containing raw material, sodium oxide presoma and magnesium oxide presoma and optional calcium oxide presoma makes the raw mix formula be mixed to get preferably also meet the mol ratio of its component oxide for ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=0.9-1.1.
It will be understood by those skilled in the art that the aluminum oxide in above-mentioned formula, potassium oxide and the ferric oxide generally main composition coming from aluminum-containing raw material itself.The general small part of sodium oxide in above-mentioned formula comes from the composition of aluminum-containing raw material itself, and major part comes from the sodium oxide presoma added in step (1).
The present inventor finds under study for action, when the mol ratio that raw mix formula meets its component oxide is [MgO]/([MgO]+[CaO])=0.5-1.0, in step (2), maturing temperature is 800-1200 DEG C, be preferably 850-1050 DEG C, can further improve the standard solubility rate of aluminum oxide; When the mol ratio that raw mix formula meets its component oxide is [MgO]/([MgO]+[CaO])=0.1-0.5, in step (2), maturing temperature is 900-1300 DEG C, is preferably 950-1150 DEG C, can further improve the standard solubility rate of aluminum oxide.Therefore, when the mol ratio that raw mix formula meets its component oxide is for [MgO]/([MgO]+[CaO])=0.5-1.0, in step (2), maturing temperature is preferably 800-1200 DEG C, is more preferably 850-1050 DEG C; When the mol ratio that raw mix formula meets its component oxide is for [MgO]/([MgO]+[CaO])=0.1-0.5, in step (2), maturing temperature is preferably 900-1300 DEG C, is more preferably 950-1150 DEG C.In step of the present invention (2), roasting time is preferably 0.25-8h; Be more preferably 0.5-4h.
It will be understood by those skilled in the art that in step of the present invention (3) and sintered clinker is obtained red mud and dissolution fluid through stripping, solid-liquid separation; After dissolution fluid is carried out desiliconization in (4) by step, carbon divides, obtain aluminium hydroxide.Also further for aluminium hydroxide roasting can be obtained aluminum oxide.Above-mentioned technique is the common process extracted in alumina industry, and can adopt various ordinary method and the processing condition of this area, this is conventionally known to one of skill in the art, does not repeat them here.
The present invention without particular requirement for the method for red mud dealkalization in step (5), can adopt the various methods that this area is conventional, such as, can adopt method disclosed in CN102432035A.The ultimate principle of red mud dealkalization is, red mud and dilute solution of sodium hydroxide are mixed and made into qualified ore pulp, then reacts at dealkalize temperature, reaction slurry is obtained after cooling, reclaim alkali lye through solid-liquid separation and obtain dealkalize red mud, dealkalize temperature is preferably 100-300 DEG C, is more preferably 150-230 DEG C.
In the present invention, aluminum-containing raw material can be natural mineral, as bauxite, coal gangue, also can be industrial mineral, and as flyash, desiliconization flyash, desiliconization coal gangue, and other are containing aluminum i ndustry solid waste.
In the present invention, namely sodium oxide presoma refers to the material that can obtain sodium oxide in roasting, such as, sodium oxide presoma can be selected from least one in sodium oxide, sodium carbonate and sodium hydroxide, in the present invention, sodium oxide presoma can be solid, also can be solution.
In the present invention, namely magnesium oxide presoma refers to and can obtain magnesian material in roasting, such as, magnesium oxide presoma can be selected from least one in magnesium oxide, magnesiumcarbonate and magnesium hydroxide, in the present invention, magnesium oxide presoma can be solid, also can be emulsion.
In the present invention, namely calcium oxide presoma refers to the material that can obtain calcium oxide in roasting, such as, calcium oxide presoma can be selected from least one in calcium oxide, calcium carbonate and calcium hydroxide, in the present invention, calcium oxide presoma can be solid, also can be emulsion.
Second aspect, the invention provides the dealkalize red mud obtained by method as above.
The third aspect, the invention provides dealkalize red mud as above and is preparing the application in fibrous magnesium silicate, heat preserving and insulating material and goods.
Embodiment
The present invention is further illustrated for following embodiment, but therefore do not limit the present invention.
In the examples below:
The measuring method of aluminum oxide standard solubility rate: by Na
2o
k(with Na
2the NaOH of O meter) 15g/L, Na
2o
c(with Na
2the Na of O meter
2cO
3) 5g/L configures Extract.Take grog 8.00g, be placed in and be added with 100mL Extract and 20mL water and the 300mL beaker being preheating to about 90 DEG C, grog is stirred loose with glass stick, put into bar magnet, electrothermal and electromagnetic agitator stirs, control at 85 ± 5 DEG C, stripping 15min.Then filtration under diminished pressure is carried out.And clean beaker and washing leaching cake 8 times with boiling water, each wash water consumption is 25mL, is dried by the filter cake after washed, cooling together with filter paper.Measure the content of aluminum oxide, sodium oxide, calcium oxide in red mud, be calculated as follows the standard solubility rate of aluminum oxide.
η Al
2o
3(%)=[1-(A red/A is ripe) × (MC ripe/MC is red)] × 100
In formula: η Al
2o
3: the standard solubility rate of aluminum oxide, %; A is ripe: Al in grog
2o
3content, %; MC is ripe: the content of MgO and CaO in grog, %; A is red: Al in red mud
2o
3content, %; MC is red: the content of MgO and CaO in red mud, %.
Embodiment 1
Aluminum-containing raw material 1: a kind of aluminous fly-ash, chemical composition is as table 1
The chemical composition analysis (weight percent) of table 1, aluminous fly-ash
| SiO 2 | Al 2O 3 | TFe 2O 3 | MgO | CaO | Na 2O | K 2O | TiO 2 | MnO | LOI | Total amount |
| 40.92 | 49.21 | 1.91 | 0.47 | 2.85 | 0.12 | 0.5 | 1.57 | 0.03 | 1.81 | 99.39 |
Get the aluminous fly-ash of 100g table 1 composition, according to ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=1.0(mol ratio), ([MgO]+[CaO])/([SiO
2]+[TiO
2])=1.0(mol ratio), [MgO]/([MgO]+[CaO])=0.93(mol ratio), add sodium carbonate and magnesium oxide.Mix merga pass 200 mesh standard sieve with small grinder fine grinding and prepare raw material.Load crucible afterwards, roasting 4h at 850 DEG C, fine grinding after cooling also obtains grog by 200 mesh standard sieves.The aluminum oxide standard solubility rate that experiment records roasting grog is 98.5%.Grog is obtained red mud through stripping, solid-liquid separation, and drying 12 hours at 120 DEG C, wherein, in the weight percent of the alkali of sodium oxide for 26.83%.Add 3 times to 5 % by weight sodium hydroxide solutions of dry red mud weight, dealkalize 1 hour at 230 DEG C afterwards, slurries are cooled to 90 DEG C of filtrations and obtain filter cake, and obtain dealkalize red mud with the hot wash of 80 DEG C, drying 12 hours at 120 DEG C, wherein, in the weight percent of the alkali of sodium oxide for 0.41%, the weight percent of Magnesium Silicate q-agent is 87.0%, and the weight percent of Calucium Silicate powder is 7.5%, the weight percent of ferric oxide is 2.53%, and other are the non-stripping impurity such as aluminum oxide.
Embodiment 2
Get the aluminous fly-ash of 100g table 1 composition, according to ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=1.1(mol ratio), ([MgO]+[CaO])/([SiO
2]+[TiO
2])=0.9(mol ratio), [MgO]/([MgO]+[CaO])=0.50(mol ratio), add sodium carbonate, calcium oxide, magnesium oxide.Carry out fine grinding with small grinder to mix merga pass 200 mesh standard sieve and prepare raw material.Load crucible afterwards, roasting 1h at 1050 DEG C, fine grinding after cooling also obtains grog by 200 mesh standard sieves.The aluminum oxide standard solubility rate that experiment records roasting grog is 96.3%.Grog is obtained red mud through stripping, solid-liquid separation, and drying 12 hours at 120 DEG C, wherein, in the weight percent of the alkali of sodium oxide for 26.37%.Add 5 times to 11 % by weight sodium hydroxide solutions of dry red mud weight, dealkalize 2 hours at 150 DEG C afterwards, slurries are cooled to 90 DEG C of filtrations and obtain filter cake, and obtain dealkalize red mud with the hot wash of 80 DEG C, drying 12 hours at 120 DEG C, wherein, in the weight percent of the alkali of sodium oxide for 0.43%, the weight percent of Magnesium Silicate q-agent is 43.5%, and the weight percent of Calucium Silicate powder is 50.5%, the weight percent of ferric oxide is 2.49%, and other are the non-stripping impurity such as aluminum oxide.
Embodiment 3
Aluminum-containing raw material 2: a kind of bauxite, chemical composition is as table 2
The chemical composition analysis (weight percent) of table 2, bauxite
| SiO 2 | Al 2O 3 | TFe 2O 3 | MgO | CaO | Na 2O | K 2O | TiO 2 | MnO | LOI | Total amount |
| 11.03 | 68.77 | 1.69 | 0.02 | 3.57 | 0.71 | 0.18 | 0.14 | 0.01 | 13.59 | 99.71 |
Get the bauxite of 100g table 2 composition, according to ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=1.05(mol ratio), ([MgO]+[CaO])/([SiO
2]+[TiO
2])=0.95(mol ratio), [MgO]/([MgO]+[CaO])=0.33(mol ratio), add sodium carbonate, magnesium oxide and calcium oxide.Carry out fine grinding with small grinder to mix merga pass 200 mesh standard sieve and prepare raw material.Load crucible afterwards, roasting 2h at 980 DEG C, fine grinding after cooling also obtains grog by 200 mesh standard sieves.The aluminum oxide standard solubility rate that experiment records roasting grog is 97.9%.Grog is obtained red mud through stripping, solid-liquid separation, and drying 12 hours at 120 DEG C, wherein, in the weight percent of the alkali of sodium oxide for 25.96%.Add 4 times to 8 % by weight sodium hydroxide solutions of dry red mud weight, dealkalize 1.5 hours at 190 DEG C afterwards, slurries are cooled to 90 DEG C of filtrations and obtain filter cake, and obtain dealkalize red mud with the hot wash of 80 DEG C, drying 12 hours at 120 DEG C, wherein, in the weight percent of the alkali of sodium oxide for 0.42%, the weight percent of Magnesium Silicate q-agent is 27.8%, and the weight percent of Calucium Silicate powder is 64.7%, the weight percent of ferric oxide is 2.63%, and other are the non-stripping impurity such as aluminum oxide.
Embodiment 4
Grog is prepared according to the method for embodiment 1, unlike, maturing temperature is 800 DEG C.The aluminum oxide standard solubility rate that experiment records roasting grog is 91.9%.
Embodiment 5
Grog is prepared according to the method for embodiment 3, unlike, maturing temperature is 900 DEG C.The aluminum oxide standard solubility rate that experiment records roasting grog is 92.9%.
As can be seen from above-described embodiment, the inventive method can keep higher aluminum oxide standard solubility rate, and because magnesian molecular weight is lower than the molecular weight of calcium oxide, therefore, greatly can reduce the amount of expendable material and the amount of solid emission, and the dealkalize red mud obtained contains Magnesium Silicate q-agent, can be used for producing the high value added product such as fibrous magnesium silicate and heat preserving and insulating material, greatly can improve the added value of aluminium.
Embodiment 1 and embodiment 4 are compared and can be found out, in raw mix formula during [MgO]/([MgO]+[CaO])=0.5-1.0, maturing temperature is 850-1050 DEG C, can further improve the standard solubility rate of aluminum oxide; Embodiment 3 and embodiment 5 are compared and can be found out, in raw mix formula during [MgO]/([MgO]+[CaO])=0.1-0.5, maturing temperature is 950-1150 DEG C, can further improve the standard solubility rate of aluminum oxide.
The inventive method can when keeping higher oxygen aluminium standard solubility rate, the very big amount of reduction expendable material and the amount of solid emission, and the dealkalize red mud obtained contains Magnesium Silicate q-agent, also can be used for producing the high value added product such as fibrous magnesium silicate and heat preserving and insulating material, greatly can improve the added value of aluminium.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. alkaline process is carried aluminium and is obtained a method for dealkalize red mud, and described method comprises:
(1) prepare raw material according to raw mix formula, described raw material comprise aluminum-containing raw material, sodium oxide presoma and magnesium oxide presoma, and optional calcium oxide presoma;
(2) described raw material are carried out roasting at 800-1300 DEG C, obtain sintered clinker;
(3) described sintered clinker is obtained red mud and dissolution fluid through stripping, solid-liquid separation;
(4) described dissolution fluid carried out desiliconization, after carbon divides, obtain aluminium hydroxide;
(5) described red mud is carried out dealkalize, obtain the dealkalize red mud containing Magnesium Silicate q-agent;
Wherein, described raw mix formula meets the mol ratio of its component oxide for ([MgO]+[CaO])/([SiO
2]+[TiO
2])=0.9-1.1.
2. method according to claim 1, wherein, in step (1), described raw mix formula meets the mol ratio of its component oxide for [MgO]/([MgO]+[CaO])=0.1-1.0.
3. method according to claim 1 and 2, wherein, in step (1), the consumption of aluminum-containing raw material, sodium oxide presoma and magnesium oxide presoma and optional calcium oxide presoma makes the raw mix formula be mixed to get also meet the mol ratio of its component oxide for ([Na
2o]+[K
2o])/([Al
2o
3]+[Fe
2o
3]+[SiO
2])=0.9-1.1.
4. method according to claim 1 and 2, wherein, when the mol ratio that described raw mix formula meets its component oxide is for [MgO]/([MgO]+[CaO])=0.5-1.0, in step (2), maturing temperature is 800-1200 DEG C, is preferably 850-1050 DEG C; When the mol ratio that described raw mix formula meets its component oxide is for [MgO]/([MgO]+[CaO])=0.1-0.5, in step (2), maturing temperature is 900-1300 DEG C, is preferably 950-1150 DEG C.
5. method according to claim 1 and 2, wherein, in step (2), roasting time is 0.25-8h, is preferably 0.5-4h.
6. method according to claim 1 and 2, wherein, in step (5), described dealkalize temperature is 100-300 DEG C, is preferably 150-230 DEG C.
7. method according to claim 1 and 2, wherein, described aluminum-containing raw material is selected from least one in bauxite, coal gangue, flyash, desiliconization flyash and desiliconization coal gangue.
8. method according to claim 1 and 2, wherein, described sodium oxide presoma is selected from least one in sodium oxide, sodium carbonate and sodium hydroxide.
9. method according to claim 1 and 2, wherein, described magnesium oxide presoma is selected from least one in magnesium oxide, magnesiumcarbonate and magnesium hydroxide.
10. method according to claim 1 and 2, wherein, described calcium oxide presoma is selected from least one in calcium oxide, calcium carbonate and calcium hydroxide.
The dealkalize red mud that 11. methods according to any one of claim 1-10 obtain.
12. dealkalize red muds according to claim 11 are preparing the application in fibrous magnesium silicate, heat preserving and insulating material and goods.
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|---|---|---|---|
| CN201310594527.7A CN104649304B (en) | 2013-11-21 | 2013-11-21 | A kind of alkali method is carried aluminium and is obtained dealkalize red mud and the application thereof of the method for dealkalize red mud and acquisition |
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|---|---|---|---|
| CN201310594527.7A CN104649304B (en) | 2013-11-21 | 2013-11-21 | A kind of alkali method is carried aluminium and is obtained dealkalize red mud and the application thereof of the method for dealkalize red mud and acquisition |
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| CN104649304A true CN104649304A (en) | 2015-05-27 |
| CN104649304B CN104649304B (en) | 2016-06-15 |
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| CN105174292A (en) * | 2014-06-06 | 2015-12-23 | 神华集团有限责任公司 | Fly ash predesilication method, predesilication reaction method, predesilication slurry separation method and fly ash aluminum-extracting method |
| CN108545781A (en) * | 2018-07-03 | 2018-09-18 | 贵州大学 | A kind of comprehensive utilization process of high-sulfur bauxite and ardealite |
| CN108640446A (en) * | 2018-04-11 | 2018-10-12 | 山东双圆生物科技有限公司 | A kind of composite organic acid red mud dealkalization agent and red mud dealkalization method |
| CN108950212A (en) * | 2018-06-25 | 2018-12-07 | 中南大学 | A kind of method of synthetical recovery sodium, aluminium, iron in red mud |
| CN110371986A (en) * | 2018-04-13 | 2019-10-25 | 国家能源投资集团有限责任公司 | Carbon divides the processing method of reactor and carbon point method and flyash |
| CN112158869A (en) * | 2020-10-16 | 2021-01-01 | 中南大学 | Method for dissolving out diasporic bauxite |
| CN114772619A (en) * | 2022-04-19 | 2022-07-22 | 百色学院 | Method for recycling Bayer process red mud |
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| CN105174292A (en) * | 2014-06-06 | 2015-12-23 | 神华集团有限责任公司 | Fly ash predesilication method, predesilication reaction method, predesilication slurry separation method and fly ash aluminum-extracting method |
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| CN108640446A (en) * | 2018-04-11 | 2018-10-12 | 山东双圆生物科技有限公司 | A kind of composite organic acid red mud dealkalization agent and red mud dealkalization method |
| CN108640446B (en) * | 2018-04-11 | 2020-10-16 | 山东双圆生物科技有限公司 | Composite organic acid red mud dealkalizing agent and red mud dealkalizing method |
| CN110371986A (en) * | 2018-04-13 | 2019-10-25 | 国家能源投资集团有限责任公司 | Carbon divides the processing method of reactor and carbon point method and flyash |
| CN110371986B (en) * | 2018-04-13 | 2021-09-03 | 国家能源投资集团有限责任公司 | Carbon separation reactor, carbon separation method and treatment method of fly ash |
| CN108950212A (en) * | 2018-06-25 | 2018-12-07 | 中南大学 | A kind of method of synthetical recovery sodium, aluminium, iron in red mud |
| CN108545781A (en) * | 2018-07-03 | 2018-09-18 | 贵州大学 | A kind of comprehensive utilization process of high-sulfur bauxite and ardealite |
| CN112158869A (en) * | 2020-10-16 | 2021-01-01 | 中南大学 | Method for dissolving out diasporic bauxite |
| CN112158869B (en) * | 2020-10-16 | 2021-06-29 | 中南大学 | Method for dissolving out diasporic bauxite |
| CN114772619A (en) * | 2022-04-19 | 2022-07-22 | 百色学院 | Method for recycling Bayer process red mud |
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