CN104003429A - Method for preparing boehmite through Bayer process seed precipitation mother solution - Google Patents
Method for preparing boehmite through Bayer process seed precipitation mother solution Download PDFInfo
- Publication number
- CN104003429A CN104003429A CN201410266128.2A CN201410266128A CN104003429A CN 104003429 A CN104003429 A CN 104003429A CN 201410266128 A CN201410266128 A CN 201410266128A CN 104003429 A CN104003429 A CN 104003429A
- Authority
- CN
- China
- Prior art keywords
- bayer
- mother liquor
- process seed
- boehmite
- separating mother
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a method for preparing boehmite through a Bayer process seed precipitation mother solution, and relates to a method for preparing the boehmite from an intermediate solution of aluminum oxide industrial production. The method includes the steps that the neutralization reaction is carried out between a NaHCO3 solution and the Bayer process seed precipitation mother solution, the Bayer process seed precipitation mother solution is decomposed and crystallized and carries out precipitation, and the produced boehmite is obtained after a period of aging; diaphragm electrolysis is carried out on a carbon precipitation mother solution which is obtained after the Bayer process seed precipitation mother solution is decomposed, a sodium bicarbonate solution is prepared in an anode region, the decomposition process is carried out, and sodium bicarbonate can be recycled. The method is applicable to preparing boehmite products with the large specific surface area and the large pore volume through the Bayer process seed precipitation mother solution, the decomposition rate is high, and roasting energy consumption of aluminum oxide can be reduced.
Description
Technical field
The invention belongs to Chemicals preparation field, be specifically related to a kind of method of utilizing Bayer-process seed-separating mother liquor to prepare boehmite, further say the method for preparing boehmite from the intermediate solution of aluminum oxide industry production.
Background technology
Aluminum oxide is the main raw material of producing non-ferrous metal aluminium, more than 90% aluminum oxide is for electrolysis aluminium metallurgy, this part aluminum oxide is called as metallurgical-grade aluminum oxide, and the aluminum oxide using beyond electrolysis aluminium metallurgy is called non-metallurgical-grade aluminum oxide or multiform alumina or chemical aluminum oxide.The production method of metallurgical-grade aluminum oxide mainly comprises Bayer process and sintering process, the main flow technique that wherein Bayer process is alumina producing, at present, and the aluminum oxide of produced worldwide and aluminium hydroxide, having more than 90% is to adopt Bayer process to produce.Two large processes of Bayer process decompose and stripping.
The decomposition of crystal seed process of sodium aluminate solution be molecular ratio lower (approximately 1.6 left and right) sodium aluminate solution at normal temperatures, add aluminium hydroxide as crystal seed, constantly stir, the Al in solution
2o
3just slowly separate out with aluminium hydroxide form, the molecular ratio of solution constantly increases simultaneously.Process in leaching refers to the solution (being referred to as decomposition nut liquid) of separating out after most of aluminium hydroxide, the hydrated alumina in when heating again can stripping bauxite, and Here it is utilizes the process of seed precipitation solution stripping bauxite.Be used alternatingly above two processes and just can process bauxite many batches ofly, obtain pure aluminium hydroxide product, form so-called Bayer process circulation.The essence of Bayer process is reacted (1) hocketing under different condition exactly.
The feature of Bayer process is to be applicable to high A/S ore, A/S > 7; This method flow process is simple, and cost is low; Good product quality, purity is high.It is the critical process of Bayer process production metallurgy grade aluminum oxide that sodium aluminate solution crystal seed decomposes, it is characterized by long (40～70 hours), decomposition efficiency low (50% left and right) of resolving time, make 50% left and right aluminum oxide meaningless consumption energy in Recycling Mother Solution, take equipment capacity, be the major reason that in alumina producing, energy consumption is high, cost is high, decomposition of crystal seed becomes the bottleneck of alumina producing Bayer process industrial technology development.Therefore, plant a point Focal point and difficult point that is always China and the research of world's aluminum oxide industry.If can rationally use Bayer-process seed-separating mother liquor, improve decomposing sodium aluminate solution rate, can increase substantially alumina producing efficiency, significantly energy-saving and cost-reducing, significantly reduce costs, bring important and far-reaching impact will to China and world's aluminum oxide industry.
Boehmite, molecular formula Al
2o
3h
2o is preparation γ-Al
2o
3and α-Al
2o
3deng the important presoma of crystal formation aluminum oxide, can be used as non-metallurgical-grade aluminum oxide, to be widely used in support of the catalyst, fire retardant, refractory materials, coated material, sorbent material, binding agent etc. multi-field.Tradition alumina producing Bayer process adopts gibbsite decomposition of crystal seed supersaturated sodium aluminate solution, makes aluminum oxide, at 1000～1200 DEG C of Roasting Decomposition product gibbsites as shown in (2).
Al
2O
3·3H
2O
(s)→Al
2O
3(s)+3H
2O ΔH＝170KJ/mol?(2)
The energy consumption of Roasting Decomposition product consumption is equivalent to 1/4th of current alumina producing total energy consumption, if directly separate out boehmite in seed precipitation process, can save 60% of roasting energy consumption, i.e. (3)
Al
2O
3·H
2O
(s)→Al
2O
3(s)+H
2O ΔH＝72KJ/mol?(3)
Decomposition course adopts boehmite to replace gibbsite, can reduce the energy consumption of producing aluminum oxide, reduces production costs, and has unrivaled advantage and vast potential for future development.CN1186046A discloses a kind of elder generation and passed into CO in sodium aluminate solution
2, reduce supersaturated sodium aluminate solution causticization coefficient, then add a crystal kind and make sodium aluminate solution crystal seed decompose the method for preparing boehmite.The method is to 90～110g/l Al
2o
3, in the sodium aluminate solution of causticization coefficient 1.4～1.6, pass into CO
2gas, treats solution causticization factor alpha
kafter being down to 1.2～1.3, under 110～120 DEG C and seed ratio 2.0～2.5 conditions, decomposition of crystal seed 30h, rate of decomposition can reach 48%～52%, passes into CO
2consumed the higher NaOH of utility value in subsequent technique, and degradation production can only be used as the precursor of metallurgical-grade aluminum oxide, range of operating parameters is narrow to be unfavorable for operation being difficult to realize industrialization.In CN102653410, adopting sodium metaaluminate and Tai-Ace S 150 is raw material, the fibrous boehmite of Hydrothermal Synthesis, and the nanometer fibrous boehmite of Fibre diameter 5～20nm, its specific surface area is at 100m
2/ g～249m
2/ g, its production cost is not high, environmental friendliness.In CN102153119A, mention using aluminum nitrate as aluminium source, by adding organic formwork agent (cetyl trimethylammonium bromide, Macrogol 2000, copolymer p 123 etc.) volatile salt as precipitation agent, preparing diameter is 7～500nm, length is 2～3 μ m, and specific surface area is at 290～380m
2the boehmite of/g, but it adds a lot of expensive organic formwork agents, and production cost is too high, and environmental pollution is large.W. R. Grace & Co of the U.S. has reported the boehmite of being prepared 2～20nm by the aluminium hydroxide after grinding and activated alumina under crystal growth inhibitor (silicate or phosphoric acid salt) exists through hydro-thermal reaction in CN1213800C, but the boehmite alumina content that this method makes is low, contain a large amount of silicon oxide and phosphoric acid salt, the existence of these impurity is to being all disadvantageous in a lot of reactions.Alumina producing flow process is alkali flow process, is afraid of the pollution of acidic substance most, as uses Al
2(SO
4)
3alCl
3or HNO
3produce boehmite Deng in acidic substance with sodium aluminate solution, the SO after reaction in mother liquor
4 2-, Cl
-, NO
3 -all can bring heavy corrosion to alumina producing flow process and equipment Deng acidic anionic, and mother liquor also cannot returning alumina Production Flow Chart recycle, thereby produce and be subject to certain limitation.Patent " a kind of sodium aluminate solution and sodium bicarbonate liquid phase method carbon divide the method for preparing the boehmite " (patent No.: 201310382973.1) propose to adopt sodium bicarbonate liquid phase method carbon to divide sodium aluminate solution that Wang Zhi etc. declare, add boehmite crystal seed induction decomposing sodium aluminate solution and separate out boehmite, after decomposing, gained carbon mother liquid obtains sodium bicarbonate through diaphragm electrolysis, returns to decomposition course stand-by.But the product that this method obtains is the metallurgical grade boehmite that added value is lower, and in product with a certain amount of gibbsite.Existing enterprise adopts and pass into CO in sodium aluminate solution
2method produce boehmite, affected by factor in many ways, product performance are stable not, product is usually followed the appearance of bayerite and gibbsite, and throughput is restricted, facility investment is large, can not well meet consumers' demand.
Summary of the invention
The present invention is directed to Bayer-process seed-separating mother liquor meaningless circulation in system that prior art exists, increase the problems such as production energy consumption, it is a kind of taking Bayer-process seed-separating mother liquor as raw material that object is to provide, and uses NaHCO
3decompose Bayer-process seed-separating mother liquor, does liquid phase method carbon divide the non-metallurgical grade that preparation added value is higher to use from Bayer-process seed-separating mother liquor? the method of boehmite product, and the sodium carbonate solution that seed precipitation solution obtains after decomposing can generate sodium bicarbonate through diaphragm electrolysis, returns to decomposition course and recycles.
The present invention is the above-mentioned purpose that is achieved by the following technical programs:
A kind of method of utilizing Bayer-process seed-separating mother liquor to prepare boehmite, employing Bayer-process seed-separating mother liquor is raw material, decompose Bayer-process seed-separating mother liquor with sodium hydrogen carbonate solution, boehmite is as crystal seed, organic additive is as dispersion agent, under agitation condition there is neutralization reaction in sodium bicarbonate and Bayer-process seed-separating mother liquor fast, crystallization precipitation, aging through for some time, slurries are realized liquid-solid separation after filtration, solid part washing is dried to obtain product boehmite, liquid portion is the diaphragm electrolysis carbon mother liquid sodium hydrogen carbonate solution obtaining in positive column, for liquid phase method carbon step by step, realize sodium hydrogen carbonate solution recycling, the condition that described sodium bicarbonate decomposes Bayer-process seed-separating mother liquor is: the concentration of Bayer-process seed-separating mother liquor is Al
2o
330～80 grams per liters, causticization coefficient is 2.1～3.2, stirring velocity is 100～500rmin
-1neutral temperature is 30～90 DEG C, aging temperature is 70～100 DEG C, crystal seed coefficient is 0～1.5, sodium bicarbonate concentration is 70～150 grams per liters, reaction times neutralize with digestion time is 0.5 hour～8 hours, and dispersion agent is one or both in organic additive polyhydroxy-alcohol, many carboxylic acids, and addition is 0%～5%.
Utilize Bayer-process seed-separating mother liquor to prepare boehmite method by described one, under wherein said agitation condition there is neutralization reaction and comprise that sodium hydrogen carbonate solution adds in Bayer-process seed-separating mother liquor in sodium bicarbonate and Bayer-process seed-separating mother liquor fast, or Bayer-process seed-separating mother liquor adds in sodium hydrogen carbonate solution, or both simultaneously and stream join in reactive tank and react.
Utilize Bayer-process seed-separating mother liquor to prepare boehmite method by described one, wherein said Bayer-process seed-separating mother liquor concentration is Al
2o
330～80 grams per liters, Al
2o
350～70g/l, causticization coefficient is 2.4～3.0, and neutralization reaction temperature is 50～80 DEG C, and aging temperature is 85～100 DEG C.
Utilize Bayer-process seed-separating mother liquor to prepare boehmite method by described one, wherein said crystal seed coefficient 0～1.5, sodium bicarbonate concentration is 90～120 grams per liters.
Utilize Bayer-process seed-separating mother liquor to prepare boehmite method by described one, the wherein said sodium hydrogen carbonate solution decomposition Bayer-process seed-separating mother liquor reaction times neutralize with digestion time is 0.5～4 hour, and stirring velocity is 100～500rmin
-1.
Utilize Bayer-process seed-separating mother liquor to prepare boehmite method by described one, wherein said dispersion agent addition is 0.05%～3%.
Utilize Bayer-process seed-separating mother liquor to prepare chemical boehmite method by described one, wherein said Bayer-process seed-separating mother liquor rate of decomposition is 60%～95%.
Utilize Bayer-process seed-separating mother liquor to prepare boehmite method by described one, wherein said boehmite product specific surface area scope is at 100～400m
2/ g, pore volume scope are at 0.5～2.0ml/g.
Compared with prior art, excellent benefit of the present invention is:
1. adopting Bayer-process seed-separating mother liquor is raw material, NaHCO
3the boehmite that liquid phase method carbon divides Bayer-process seed-separating mother liquor to prepare high added value, for producing aluminum oxide energy efficient, realizes Bayer-process seed-separating mother liquor recycling, has economic interests and application potential.
2. adopt NaHCO
3as neutralizing agent, the fast and Bayer-process seed-separating mother liquor rate of decomposition high (more than 80%) of speed of response, and other acid ions that can not induce one in the circulation of aluminum oxide alkalescence, can not cause corrosion to flow process and equipment.
3. Bayer-process seed-separating mother liquor decomposes rear gained carbon mother liquid through the renewable one-tenth of diaphragm electrolysis NaHCO
3, can return to liquid phase method carbon operation break-down and use, realize the recycle of material.
4. this invention production boehmite preparation technology is simple, easy to operate, and parameter is controlled, and production cost is lower, and excellent product performance, without gibbsite or other dephasigns of bayerite.Control certain preparation condition and can make high-specific surface area (100～4000m
2/ g), the boehmite product of large pore volume (0.5～2.0ml/g), be with a wide range of applications.
Brief description of the drawings
Fig. 1 is the process flow sheet of preparing boehmite with Bayer-process seed-separating mother liquor;
Fig. 2 is the XRD spectra that does not add the boehmite product of preparing under crystal seed condition with Bayer-process seed-separating mother liquor;
Fig. 3 is the SEM photo that does not add the boehmite product of preparing under crystal seed condition with Bayer-process seed-separating mother liquor;
Fig. 4 is the XRD spectra that adds the boehmite product of preparing under boehmite crystal seed condition with Bayer-process seed-separating mother liquor;
Fig. 5 is the SEM photo that adds the boehmite product of preparing under boehmite crystal seed condition with Bayer-process seed-separating mother liquor.
Embodiment
Below in conjunction with accompanying drawing, with embodiments of the invention, the invention will be further described, but do not limit the present invention with this.
The present invention is a kind of method of utilizing Bayer-process seed-separating mother liquor to prepare boehmite, and the technical process of the method as shown in Figure 1, can be summarized as following steps:
1. there is neutralization reaction under stirring action in Bayer-process seed-separating mother liquor and sodium hydrogen carbonate solution in isothermal reaction groove, non-metallurgical grade boehmite is crystal seed, be added with organic additive as dispersion agent, Bayer-process seed-separating mother liquor decomposes gained and is deposited in and in carbon mother liquid, carries out agingly, obtains slurries.
2. the slurries after aging, through isolated by vacuum filtration, obtain filter cake and carbon mother liquid (Na
2cO
3), with hot deionized water wash filter cake, to neutral, filter cake is at 120 DEG C of baking oven inner drying 24h subsequently, and solid product obtains boehmite powder after depolymerization.Carbon mother liquid is converted into sodium bicarbonate through diaphragm electrolysis in anolyte compartment, represents the NaHCO that electrolysis obtains suc as formula (4)
3solution is being separated out boehmite for Bayer-process seed-separating mother liquor.
The feature of aforesaid method is: Bayer-process seed-separating mother liquor concentration Al
2o
330～80g/l, causticization coefficient 2.1～3.2, stirring velocity 100～500rmin
-1, 30～90 DEG C of neutral temperatures, 70～100 DEG C of aging temperatures, crystal seed coefficient 0～1.5, NaHCO
3concentration 70～150g/l, addition manner is short mix, comprises that Bayer-process seed-separating mother liquor adds NaHCO to
3in solution, NaHCO
3solution add in Bayer-process seed-separating mother liquor and both simultaneously and stream join in reactive tank, 0.5 hour～8 hours reaction times (neutralization and digestion time).Dispersion agent is one or more in the organic additives such as polyhydroxy-alcohol, many carboxylic acids, and addition is 0%～5%.Electrolysis carbon mother liquid obtains sodium hydrogen carbonate solution in positive column, and concentration can reach 40～100g/l, returns to carbon operation break-down, realizes sodium bicarbonate cyclic regeneration.
In addition, described Bayer-process seed-separating mother liquor concentration is preferably Al
2o
350～70g/l, causticization coefficient is 2.4～3.0.
Described neutralization reaction temperature is 50～80 DEG C, and aging temperature is 85～100 DEG C
Described sodium bicarbonate concentration is 90～120g/l, and crystal seed coefficient is 0～1.5.
Described dispersion agent addition is 0.05%～3%.
The described reaction times is 0.5～4 hour, and stirring velocity is 100～500rmin
-1.
Several concrete concrete instances below.
Embodiment 1
Adjusting Bayer-process seed-separating mother liquor concentration is Al
2o
330g/l, causticization coefficient is 2.1, sodium bicarbonate concentration is 70g/l, 100ml Bayer-process seed-separating mother liquor is joined in reactive tank, reactive tank is placed in water bath with thermostatic control, and 200ml sodium hydrogen carbonate solution is added fast and in Bayer-process seed-separating mother liquor, carries out neutralization reaction, stirring velocity 300rmin
-1, control 30 DEG C of neutral temperatures, gained slurries are aging at 70 DEG C, and the reaction times is 3 hours, and fast filtering washing, realizes liquid-solid separation, and solid drying is ground and is obtained boehmite product.Gained carbon mother liquid, through diaphragm electrolysis, obtains the NaHCO of 45g/l in positive column
3solution, is adjusted into suitable concentration stand-by.
Bayer-process seed-separating mother liquor liquid phase method carbon divides and the results are shown in Table 1.
Table 1 Bayer-process seed-separating mother liquor liquid phase method carbon divides result
| Rate of decomposition/% | Boehmite specific surface area/m 2/g | Boehmite pore volume/ml/g |
| 70％ | 120 | 0.55 |
Embodiment 2
Adjusting Bayer-process seed-separating mother liquor concentration is Al
2o
350g/l, causticization coefficient is 2.4, sodium bicarbonate concentration is 90g/l, 100ml Bayer-process seed-separating mother liquor is joined in reactive tank, and reactive tank is placed in water bath with thermostatic control, and 200ml sodium hydrogen carbonate solution is poured into fast and in Bayer-process seed-separating mother liquor, carried out neutralization reaction, add boehmite crystal seed, crystal seed coefficient 0.5, adds dispersion agent Macrogol 2000 addition 0.5%, stirring velocity 500rmin
-1, control 60 DEG C of neutral temperatures, gained slurries are aging at 100 DEG C, and the reaction times is 0.5 hour, and fast filtering washing, realizes liquid-solid separation, and solid drying is ground and is obtained boehmite product.Gained carbon mother liquid, through diaphragm electrolysis, obtains the NaHCO of 65g/l in positive column
3solution, is adjusted into suitable concentration stand-by.
Bayer-process seed-separating mother liquor liquid phase method carbon divides and the results are shown in Table 2.
Table 2 Bayer-process seed-separating mother liquor liquid phase method carbon divides result
| Rate of decomposition/% | Boehmite specific surface area/m 2/g | Boehmite pore volume/ml/g |
| 75％ | 160 | 0.70 |
Embodiment 3
Adjusting Bayer-process seed-separating mother liquor concentration is Al
2o
380g/l, causticization coefficient is 2.8, sodium bicarbonate concentration is 120g/l, 200ml sodium hydrogen carbonate solution is joined in reactive tank, and reactive tank is placed in water bath with thermostatic control, pours fast 100ml Bayer-process seed-separating mother liquor into sodium hydrogen carbonate solution and carries out neutralization reaction, add boehmite crystal seed, crystal seed coefficient 1.5, adds dispersion agent Macrogol 4000 addition 1%, stirring velocity 200rmin
-1, control 80 DEG C of neutral temperatures, gained slurries are aging at 80 DEG C, and the reaction times is 5 hours, and fast filtering washing, realizes liquid-solid separation, and solid drying is ground and is obtained boehmite product.Gained carbon mother liquid, through diaphragm electrolysis, obtains the NaHCO of 80g/l in positive column
3solution, is adjusted into suitable concentration stand-by.
Bayer-process seed-separating mother liquor liquid phase method carbon divides and the results are shown in Table 3.
Table 3 Bayer-process seed-separating mother liquor liquid phase method carbon divides result
| Rate of decomposition/% | Boehmite specific surface area/m 2/g | Boehmite pore volume/ml/g |
| 80％ | 200 | 0.83 |
Embodiment 4
Adjusting Bayer-process seed-separating mother liquor concentration is Al
2o
340g/l, causticization coefficient is 3.2, sodium bicarbonate concentration is 150g/l, 200ml sodium hydrogen carbonate solution is joined in reactive tank, and reactive tank is placed in water bath with thermostatic control, pours fast 100ml Bayer-process seed-separating mother liquor into sodium hydrogen carbonate solution and carries out neutralization reaction, add boehmite crystal seed, crystal seed coefficient 0.2, adds dispersion agent sodium lauryl sulphate addition 3%, stirring velocity 100rmin
-, control 50 DEG C of neutral temperatures, gained slurries are aging at 95 DEG C, and the reaction times is 6 hours, and fast filtering washing, realizes liquid-solid separation, and solid drying is ground and is obtained boehmite product.Gained carbon mother liquid, through diaphragm electrolysis, obtains the NaHCO of 100g/l in positive column
3solution, is adjusted into suitable concentration stand-by.
Bayer-process seed-separating mother liquor liquid phase method carbon divides and the results are shown in Table 4.
Table 4 Bayer-process seed-separating mother liquor liquid phase method carbon divides result
| Rate of decomposition/% | Boehmite specific surface area/m 2/g | Boehmite pore volume/ml/g |
| 88％ | 255 | 0.62 |
Embodiment 5
Adjusting Bayer-process seed-separating mother liquor concentration is Al
2o
360g/l, causticization coefficient is 2.5, sodium bicarbonate concentration is 110g/l, 200ml sodium hydrogen carbonate solution and 100ml Bayer-process seed-separating mother liquor stream are joined fast and in reactive tank, carries out neutralization reaction, reactive tank is placed in water bath with thermostatic control, add dispersion agent sodium lauryl sulphate addition 1%, stirring velocity 400rmin
-1, control 90 DEG C of neutral temperatures, gained slurries are aging at 90 DEG C, and the reaction times is 2 hours, and fast filtering washing, realizes liquid-solid separation, and solid drying is ground and is obtained boehmite product.Gained carbon mother liquid, through diaphragm electrolysis, obtains the NaHCO of 75g/l in positive column
3solution, is adjusted into suitable concentration stand-by.
Bayer-process seed-separating mother liquor liquid phase method carbon divides and the results are shown in Table 5.
Table 5 Bayer-process seed-separating mother liquor liquid phase method carbon divides result
| Rate of decomposition/% | Boehmite specific surface area/m 2/g | Boehmite pore volume/ml/g |
| 76％ | 285 | 1.13 |
Embodiment 6
Adjusting Bayer-process seed-separating mother liquor concentration is Al
2o
350g/l, causticization coefficient is 2.2, sodium bicarbonate concentration is 100g/l, 100ml Bayer-process seed-separating mother liquor is joined in reactive tank, reactive tank is placed in water bath with thermostatic control, and 200ml sodium hydrogen carbonate solution is poured into fast in Bayer-process seed-separating mother liquor and carried out neutralization reaction, adds dispersion agent Macrogol 2000 to coordinate by 1:1 with Macrogol 4000, addition 4%, stirring velocity 150rmin
-1, control 70 DEG C of neutral temperatures, gained slurries are aging at 100 DEG C, and the reaction times is 8 hours, and fast filtering washing, realizes liquid-solid separation, and solid drying is ground and is obtained boehmite product.Gained carbon mother liquid, through diaphragm electrolysis, obtains 60g/l NaHCO in positive column
3solution, is adjusted into suitable concentration stand-by.
Bayer-process seed-separating mother liquor liquid phase method carbon divides and the results are shown in Table 6.
Table 6 Bayer-process seed-separating mother liquor liquid phase method carbon divides result
| Rate of decomposition/% | Boehmite specific surface area/m 2/g | Boehmite pore volume/ml/g |
| 93％ | 350 | 1.50 |
Claims (8)
1. a method of utilizing Bayer-process seed-separating mother liquor to prepare boehmite, it is characterized in that: employing Bayer-process seed-separating mother liquor is raw material, decompose Bayer-process seed-separating mother liquor with sodium hydrogen carbonate solution, boehmite is as crystal seed, organic additive is as dispersion agent, under agitation condition there is neutralization reaction in sodium bicarbonate and Bayer-process seed-separating mother liquor fast, crystallization precipitation, aging through for some time, slurries are realized liquid-solid separation after filtration, solid part washing is dried to obtain product boehmite, liquid portion is the diaphragm electrolysis carbon mother liquid sodium hydrogen carbonate solution obtaining in positive column, for liquid phase method carbon step by step, realize sodium hydrogen carbonate solution recycling, the condition that described sodium bicarbonate decomposes Bayer-process seed-separating mother liquor is: the concentration of Bayer-process seed-separating mother liquor is Al
2o
330～80 grams per liters, causticization coefficient is 2.1～3.2, stirring velocity is 100～500rmin
-1neutral temperature is 30～90 DEG C, aging temperature is 70～100 DEG C, crystal seed coefficient is 0～1.5, sodium bicarbonate concentration is 70～150 grams per liters, reaction times neutralize with digestion time is 0.5 hour～8 hours, and dispersion agent is one or both in organic additive polyhydroxy-alcohol, many carboxylic acids, and addition is 0%～5%.
2. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: under described agitation condition, sodium bicarbonate and Bayer-process seed-separating mother liquor neutralization reaction occurs fast comprise that sodium hydrogen carbonate solution adds in Bayer-process seed-separating mother liquor, or Bayer-process seed-separating mother liquor adds in sodium hydrogen carbonate solution, or both simultaneously and stream join in reactive tank and react.
3. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: described Bayer-process seed-separating mother liquor concentration is Al
2o
330～80 grams per liters, Al
2o
350～70g/l, causticization coefficient is 2.4～3.0, and neutralization reaction temperature is 50～80 DEG C, and aging temperature is 85～100 DEG C.
4. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: described crystal seed coefficient 0～1.5, sodium bicarbonate concentration is 90～120 grams per liters.
5. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: the described sodium hydrogen carbonate solution decomposition Bayer-process seed-separating mother liquor reaction times neutralize with digestion time is 0.5～4 hour, and stirring velocity is 100～500rmin
-1.
6. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: described dispersion agent addition is 0.05%～3%.
7. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: described Bayer-process seed-separating mother liquor rate of decomposition is 60%～95%.
8. utilize Bayer-process seed-separating mother liquor to prepare boehmite method according to one claimed in claim 1, it is characterized in that: described boehmite product specific surface area scope is at 100～400m
2/ g, pore volume scope are at 0.5～2.0ml/g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410266128.2A CN104003429B (en) | 2014-06-14 | 2014-06-14 | A kind of method utilizing Bayer-process seed-separating mother liquor to prepare boehmite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410266128.2A CN104003429B (en) | 2014-06-14 | 2014-06-14 | A kind of method utilizing Bayer-process seed-separating mother liquor to prepare boehmite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104003429A true CN104003429A (en) | 2014-08-27 |
| CN104003429B CN104003429B (en) | 2015-09-30 |
Family
ID=51364374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410266128.2A Expired - Fee Related CN104003429B (en) | 2014-06-14 | 2014-06-14 | A kind of method utilizing Bayer-process seed-separating mother liquor to prepare boehmite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104003429B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111204787A (en) * | 2020-02-05 | 2020-05-29 | 中铝中州铝业有限公司 | Method for joint production of aluminum oxide and steel refining slag |
| CN115231596A (en) * | 2022-08-05 | 2022-10-25 | 洛阳中超新材料股份有限公司 | Industrial preparation method of bayer stone |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045542A (en) * | 2007-04-06 | 2007-10-03 | 中国科学院过程工程研究所 | Method for preparing water softening aluminium stone of sodium aluminate solution carbonation resolving |
| CN101657384A (en) * | 2007-03-27 | 2010-02-24 | 美铝澳大利亚有限公司 | Method for precipitating boehmite |
| CN101665262A (en) * | 2009-10-21 | 2010-03-10 | 中国铝业股份有限公司 | Preparation method for pseudo-boehmite |
| CN101920978A (en) * | 2010-06-25 | 2010-12-22 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN102942199A (en) * | 2012-10-17 | 2013-02-27 | 河南科技大学 | Preparation method of boehmite nanocrystallines or nanowhiskers |
| CN103449486A (en) * | 2013-08-29 | 2013-12-18 | 中国科学院过程工程研究所 | Method for preparing boehmite by liquid phase carbonating decomposition of sodium aluminate solution and sodium bicarbonate |
-
2014
- 2014-06-14 CN CN201410266128.2A patent/CN104003429B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657384A (en) * | 2007-03-27 | 2010-02-24 | 美铝澳大利亚有限公司 | Method for precipitating boehmite |
| CN101045542A (en) * | 2007-04-06 | 2007-10-03 | 中国科学院过程工程研究所 | Method for preparing water softening aluminium stone of sodium aluminate solution carbonation resolving |
| CN101665262A (en) * | 2009-10-21 | 2010-03-10 | 中国铝业股份有限公司 | Preparation method for pseudo-boehmite |
| CN101920978A (en) * | 2010-06-25 | 2010-12-22 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN102942199A (en) * | 2012-10-17 | 2013-02-27 | 河南科技大学 | Preparation method of boehmite nanocrystallines or nanowhiskers |
| CN103449486A (en) * | 2013-08-29 | 2013-12-18 | 中国科学院过程工程研究所 | Method for preparing boehmite by liquid phase carbonating decomposition of sodium aluminate solution and sodium bicarbonate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111204787A (en) * | 2020-02-05 | 2020-05-29 | 中铝中州铝业有限公司 | Method for joint production of aluminum oxide and steel refining slag |
| CN115231596A (en) * | 2022-08-05 | 2022-10-25 | 洛阳中超新材料股份有限公司 | Industrial preparation method of bayer stone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104003429B (en) | 2015-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103241754B (en) | Production method of high-purity aluminum oxide | |
| CN103449484B (en) | Method for continuously producing pseudoboehmite | |
| CN102320615A (en) | Method for preparing precipitated silica by adopting micro-silica fume as raw material | |
| CN103964480A (en) | Process for producing aluminum oxide by using hydrochloric acid method | |
| CN107128959B (en) | A kind of bauxite salt Ore Leaching substep electrolytic preparation aluminium oxide and method of comprehensive utilization | |
| CN104891534A (en) | Method for preparing high-purity high-activity magnesium hydroxide through calcium-containing magnesium hydroxide | |
| CN104760980B (en) | A kind of preparation technology of high-purity superfine alumina powder | |
| CN104591234A (en) | Process for preparing light magnesium carbonate from industrial magnesium hydroxide | |
| Lu et al. | Preparation and Properties of Pseudo-boehmite Obtained from High-Alumina Fly Ash by a Sintering–CO 2 Decomposition Process | |
| CN106011498A (en) | Method for preparing metal aluminum from bauxite through microwave chlorination | |
| CN103880012B (en) | A kind of method that sial material activating decomposes | |
| CN113860341B (en) | High-purity platy boehmite and preparation method thereof | |
| CN104003429B (en) | A kind of method utilizing Bayer-process seed-separating mother liquor to prepare boehmite | |
| CN102432051B (en) | Method for preparing spherical Bayer stones | |
| CN109052446B (en) | Method for preparing calcium-aluminum hydrotalcite by using industrial waste residues as raw materials | |
| CN101786644B (en) | Sandy alumina preparation method | |
| CN102910657A (en) | Method for preparing high-pure aluminum oxide | |
| WO2015051482A1 (en) | Method for manufacturing sheet monodisperse nano-magnesium hydroxide by using magnesite | |
| CN105293796A (en) | Method for co-production of sodalumite and gypsum through activated clay production mother liquid | |
| CN102452675A (en) | Method for preparing nanometer/micrometer-scale high-purity magnesium oxide | |
| CN113860340B (en) | Method for preparing high-purity granular boehmite by dry method and boehmite | |
| CN107200342A (en) | A kind of flyash chlorination electrolytic preparation aluminum oxide and the method for comprehensive utilization | |
| CN107935018B (en) | Preparation method of two-dimensional transition metal nano-sheet with structure memory | |
| CN102838141A (en) | Process for producing magnesium hydrate by removing silicon and aluminum from magnesite | |
| CN107235499B (en) | A kind of bauxite pelletizing chlorination electrolytic preparation aluminium oxide and the method for comprehensive utilization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20210614 |