CN109748475A - A kind of method of bio oil deacidification upgrading - Google Patents
A kind of method of bio oil deacidification upgrading Download PDFInfo
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- CN109748475A CN109748475A CN201910196749.0A CN201910196749A CN109748475A CN 109748475 A CN109748475 A CN 109748475A CN 201910196749 A CN201910196749 A CN 201910196749A CN 109748475 A CN109748475 A CN 109748475A
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Abstract
The present invention provides a kind of methods of bio oil deacidification upgrading, belong to the development and utilization field of biomass energy.Red mud is dissolved in acid by the present invention to be heated, the red mud after obtaining pickling；Red mud by the red mud washing after the pickling, after being washed；Red mud after the washing is immersed in ammonium hydroxide after adjusting pH value and dried, obtains dry red mud；The red mud of the drying is mixed with water, obtains red mud slurry；It is dried after Ceramic Balls are mixed with the red mud slurry, obtains red mud Ceramic Balls；The red mud Ceramic Balls are roasted, changed red mud Ceramic Balls are obtained；It is pyrolyzed after the changed red mud ceramics are mixed with stalk, obtains the bio oil of deacidification upgrading.The present invention by red mud carry out pickling it is modified, so that it is supported on spherical ceramic particles surface, then carry out calcination process, improve oxygen vacancy concentration and acid bit quantity, make red mud that there is redox ability, guarantees that biomass comes into full contact with red mud, reduce content sour in biomass.
Description
Technical field
The present invention relates to the development and utilization field of biomass energy, in particular to a kind of method of bio oil deacidification upgrading.
Background technique
Stalk " use is then sharp, and abandoning is then done harm to ".The development and utilization of stalk resource are related to the sustainable development of entire Agro-ecological System
Exhibition problem gradually becomes the inevitable requirement of agricultural and Rural Social Economy sustainable development.
Rapidly pyrolysing and liquefying biomass technology can be by stover at liquid bio-oil, and bio oil contains many chemicals
Matter has very high application value, both can be used as industrial chemicals and prepared chemicals, can also upgrading be further fuel.But
It is since containing higher carboxylic acid, bio oil has certain corrosivity to consersion unit and pipeline, and carboxylic acid is unstable, is easy
Polymerization occurs and generates macromolecular substances.So the further conversion of carboxylic acid is that bio oil application primarily solves the problems, such as.Carboxylic acid can
To generate ketone by the reaction of carboxyl ketonization.Ketonization reaction is that the carboxylic acid of two molecules is sloughed to a carbonyl to generate ketone, is increased
C-C chain length, while carbon dioxide and water are generated, the oxygen in bio oil is removed, combustion heat value is improved.The reaction of decarboxylation ketonization
Common catalyst mainly has metal oxide, zeolite molecular sieve, Zn/Al metal oxide, Mg/Al hydrotalcite etc..But this
A little catalyst exist in the form of particle or powder, and the easy coking deactivation of pyrolytic process, carbon residue is difficult to separate, need with catalyst
It is constantly regenerating, cost is increased, and these catalyst own mechanical intensity are low, it is easy to wear.Therefore it develops a kind of cheap, latent
With sacrifice, can be with the catalyst of successive reaction carboxylic acid ketonization research direction.
The waste material that red mud is discharged as aluminum oxide industry, domestic annual emissions are more than 3000 tons, and the stacking of red mud not only accounts for
With soil, periphery ecological environment is threatened, while being also a kind of wasting of resources.Red mud main chemical compositions be iron, aluminium, silicon, calcium,
The oxide of titanium, sodium has biggish internal surface area and porous structure.
Although content sour in biomass can be reduced to a certain extent by the catalytic action of red mud in the prior art,
But effect is not significant.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of methods of bio oil deacidification upgrading.The present invention passes through to red
Mud carry out pickling it is modified, so that it is supported on spherical ceramic particles surface, then carry out calcination process, improve oxygen vacancy concentration and
Acid bit quantity makes red mud have redox ability, guarantees that biomass comes into full contact with red mud, reduces sour in biomass contain
Amount.
In order to reach the goals above, the present invention provides following technical schemes:
The present invention provides a kind of methods of bio oil deacidification upgrading, comprising the following steps:
Red mud is dissolved in acid and is heated, the red mud after obtaining pickling；
Red mud by the red mud washing after the pickling, after being washed；
Red mud after the washing is immersed in ammonium hydroxide after adjusting pH value and dried, obtains dry red mud；
The red mud of the drying is mixed with water, obtains red mud slurry；
It is dried after Ceramic Balls are mixed with the red mud slurry, obtains red mud Ceramic Balls；
The red mud Ceramic Balls are roasted, changed red mud Ceramic Balls are obtained；
It is pyrolyzed after the changed red mud ceramics are mixed with stalk, obtains the bio oil of deacidification upgrading.
Preferably, the acid includes hydrogen chloride, sulfuric acid or nitric acid solution.
Preferably, the concentration of the acid is 0.2mol/L~1mol/L.
Preferably, the amount ratio of the red mud and acid is 1g:5ml~1g:20ml.
Preferably, the pH value is 8.
Preferably, the mass ratio of the red mud and water of the drying is 1:2~2:1.
Preferably, the diameter of the Ceramic Balls is 2~5mm.
Preferably, the temperature of the roasting is 600 DEG C, and the heating rate for being warming up to the temperature of the roasting is 10~20
DEG C/min, the soaking time of roasting is 2~4h.
Preferably, the mass ratio of the changed red mud ceramics and stalk is 1~2:1.
Preferably, the temperature of the pyrolysis is 450 DEG C~600 DEG C.
The present invention provides a kind of methods of bio oil deacidification upgrading, comprising the following steps: and red mud is dissolved in acid and is heated,
Red mud after obtaining pickling；Red mud by the red mud washing after the pickling, after being washed；By the red mud leaching after the washing
Enter and dried after adjusting pH value in ammonium hydroxide, obtains dry red mud；The red mud of the drying is mixed with water, obtains red mud slurry；It will
Ceramic Balls are dried after mixing with the red mud slurry, obtain red mud Ceramic Balls；The red mud Ceramic Balls are roasted, obtain being modified red
Mud Ceramic Balls；It is pyrolyzed after the changed red mud ceramics are mixed with stalk, obtains the bio oil of deacidification upgrading.The present invention is logical
It crosses and red mud progress pickling is modified, so that it is supported on spherical ceramic particles surface, then carry out calcination process, keep part metals salt raw
At metal oxide, oxygen vacancy concentration and acid bit quantity are improved, so that red mud has redox ability, guarantees biomass
It is come into full contact with red mud, reduces content sour in biomass.
Meanwhile the waste material that red mud is discharged as aluminum oxide industry, domestic annual emissions are more than 3000 tons, the stacking of red mud is not
It only takes up soil, threaten periphery ecological environment, by the recycling to red mud resource, realize turns waste into wealth the present invention, saves
Resource, protects environment.
Also, in the present invention, carbon residue and be attached to that changed red mud Ceramic Balls generate after reacting with stalk through mixed pyrolysis
The red mud of changed red mud ceramics ball surface is easy to bio oil separation, simplifies operating procedure, has saved production cost.
Specific embodiment
The present invention provides a kind of methods of bio oil deacidification upgrading, comprising the following steps:
Red mud is dissolved in acid and is heated, the red mud after obtaining pickling；
Red mud by the red mud washing after the pickling, after being washed；
Red mud after the washing is immersed in ammonium hydroxide after adjusting pH value and dried, obtains dry red mud；
The red mud of the drying is mixed with water, obtains red mud slurry；
It is dried after Ceramic Balls are mixed with the red mud slurry, obtains red mud Ceramic Balls；
The red mud Ceramic Balls are roasted, changed red mud Ceramic Balls are obtained；
It is pyrolyzed after the changed red mud ceramics are mixed with stalk, obtains the bio oil of deacidification upgrading.
Red mud is dissolved in acid by the present invention to be heated, the red mud after obtaining pickling.
The present invention is ground after preferably first drying red mud, and the red mud after being ground, which is re-dissolved in acid, to be heated.
In the present invention, the temperature of the drying is preferably 100~120 DEG C, and further preferably 110 DEG C, the drying
Time be preferably 4~6h, further preferably 5h.The present invention does not have special restriction to the mode of the drying, using this
Drying equipment known to the technical staff of field, specific is preferably thermostatic drying chamber.
In the present invention, the partial size of red mud is preferably 80~120 μm after grinding, and further preferably 100 μm.The present invention couple
The lapping mode of the red mud does not have special restriction, using mode well known to those skilled in the art.
The present invention is using red mud well known to those skilled in the art to the source of the red mud also not special restriction
Can, specific is preferably the red mud waste material of aluminum oxide industry discharge.
After red mud after being ground, the red mud after the grinding is dissolved in acid by the present invention to be heated, after obtaining pickling
Red mud.
In the present invention, the acid preferably includes hydrogen chloride, sulfuric acid or nitric acid solution, and the concentration of the acid is preferably
0.2mol/L~1mol/L, further preferably 0.5mol/L.The present invention does not have special restriction to the source of the acid, uses
Commercial product well known to those skilled in the art.In the present invention, the acid can dissolve red mud, release Na+With
Ca2+, because being easy sintering under the oxide high-temperature of Na and Ca, specific surface area can be reduced；And the oxide of Na and Ca has highly basic
Property, it will cause the passivation inactivation in acidity of catalyst site；Na but after overpickling, in red mud+And Ca2+It is dissolved in acid and generates salt,
It is soluble easily in water, to be removed, and it will form new hole in the red mud particle after pickling, specific surface area increases.
In the present invention, the amount ratio of the red mud and acid is preferably 1g:5ml~1g:20ml, more preferably 1g:10mL.
In the present invention, the heating preferably carries out under mechanical agitation, and the churned mechanically revolving speed is preferably
10~25r/min.
In the present invention, the temperature of the heating is preferably 60~80 DEG C, and further preferably 70 DEG C, the liter of the heating
Warm rate is preferably 5~20 DEG C/min, and the soaking time of the heating is preferably 1.5~2.2h, more preferably 2h.
After the completion of heating, gained Heated Products are preferably filtered by the present invention, the red mud after obtaining pickling.The present invention couple
The mode of the filtering does not have special restriction, using technological means well known to those skilled in the art.In the present invention,
The filtering can remove the extra inert substance impurity insoluble in acid.
After red mud after obtaining pickling, the present invention washes the red mud after the pickling, the red mud after being washed.
Red mud after pickling is preferably added to the water by the present invention, is washed.
In the present invention, the water is preferably deionized water.The present invention does not have special requirement to the number of washing, can incite somebody to action
Remaining impurity (such as Cl-) removal is completely.
Obtained washing product is preferably filtered by the present invention, the red mud after being washed.
The present invention does not have special restriction to the mode of the filtering, using technological means well known to those skilled in the art
?.
After red mud after being washed, the present invention immerses the red mud after the washing in ammonium hydroxide dries after tune pH value, obtains
To dry red mud.The present invention does not have special restriction to the source of the ammonium hydroxide, using city well known to those skilled in the art
Sell product.
In the present invention, the pH value is preferably 8.
After adjusting pH value, the present invention preferably will adjust the product after pH value to filter.The present invention does not have the mode of the filtering
Special restriction, using technological means well known to those skilled in the art.
In the present invention, the temperature of the drying is preferably 100~120 DEG C, and further preferably 110 DEG C, the drying
Time be preferably 4~6h, further preferably 5h.
After obtaining dry red mud, the present invention mixes the red mud of the drying with water, obtains red mud slurry.
In the present invention, the water is preferably deionized water, the red mud of the drying and the mass ratio of water be preferably 2:1~
2:1。
In the present invention, the mixed mode is preferably mechanical stirring, and the churned mechanically revolving speed is preferably 10~
25r/min, the churned mechanically time is preferably 1.5~2.5h, further preferably 2h, and the mixed temperature is preferably
80~100 DEG C, further preferably 90 DEG C.
After obtaining red mud slurry, the present invention is dried after mixing Ceramic Balls with the red mud slurry, obtains red mud Ceramic Balls.
In the present invention, the partial size of the Ceramic Balls is preferably 2mm, and the mixed time is preferably 5~10min.
In the present invention, the temperature of the drying is preferably 100~120 DEG C, and further preferably 110 DEG C, the drying
Time be preferably 12~36h, further preferably for 24 hours.
In the present invention, the mixing and drying can make red mud uniformly be supported on ceramic ball surface.
After obtaining red mud Ceramic Balls, the present invention preferably roasts the red mud Ceramic Balls, obtains changed red mud Ceramic Balls.
Present invention preferably employs Muffle furnaces to calcine the red mud Ceramic Balls.
In the present invention, the temperature of the calcining is preferably 600 DEG C, and the heating rate of the calcining is preferably 10 DEG C/
Min, the soaking time of the calcining are preferably 4h.
After obtaining changed red mud Ceramic Balls, the present invention is pyrolyzed after mixing the changed red mud ceramics with stalk, is obtained
To the bio oil of deacidification upgrading.
In the present invention, the mass ratio of the changed red mud Ceramic Balls and stalk is preferably 1:3~2:1, and the mixing is excellent
It is selected under the conditions of natural room temperature, the mixed mode is preferably mechanical stirring, and the churned mechanically time is preferably 5min.
In the present invention, the stalk preferably uses straw powder, and the partial size of the straw powder is preferably 60~80 mesh.This hair
The source of the bright stalk does not have special restriction, using the common stalk of those skilled in the art, specifically may be used
Preferably corn stalk powder.
In the present invention, the pyrolysis carries out preferably in horizontal beds, and the temperature of the pyrolysis is preferably 500 DEG C, pyrolysis
Heating rate be preferably greater than 100 DEG C/s, the time of pyrolysis is preferably 2min.In the present invention, the pyrolysis can be by straw
Stalk is converted into volatile gas componant and solid carbon residue, and volatile gas componant sufficiently connects during release with catalyst
Touching, wherein carboxyl is catalyzed as ketone group, therefore the organic acid content that reactivity is high in bio oil reduces, and it is more steady to generate property
Fixed ketone.
The present invention preferably is condensed to obtain bio oil to the volatile ingredient after pyrolysis.The present invention is to the condensation
Temperature does not have special limitation, using those skilled in the art's conventional technology.
The present invention preferably sieves the solid carbon residue after pyrolysis.In the present invention, the mesh number of the screening is preferably
60 mesh, the screening can separating catalyst and solid carbon residue, be conducive to living again and secondary use and carbon residue for catalyst
Subsequent processing.
In order to further illustrate the present invention, below with reference to embodiment to the method for bio oil deacidification upgrading provided by the invention
It is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Red mud is taken to dry 5h at 110 DEG C, being ground to partial size is 100 μm；
Red mud after grinding is dissolved in the hydrogen chloride solution of 0.5mol/L, the suspension that concentration is 100g/L is formed；
By the suspension to be warming up to 70 DEG C under 10 DEG C/min, 2h is kept the temperature in the case where revolving speed is 15r/min, filters, obtains
Red mud after pickling；
Red mud after the pickling is washed with deionized completely, the red mud after being washed；
Ammonium hydroxide will be added in red mud after the washing, adjusting pH is 8, filtering, and 110 DEG C of dry 5h obtain the red of drying
Mud；
The red mud of the drying is mixed with deionized water with mass ratio for 2:1,90 DEG C of stirring 2h obtain red mud slurry
Liquid；
The Ceramic Balls that diameter is 2mm are immersed in the red mud slurry, are taken out after 8min, 110 DEG C of dryings for 24 hours, obtain red
Mud Ceramic Balls；
The red mud Ceramic Balls are roasted at 600 DEG C, heating rate is 10 DEG C/min, keeps the temperature 4h, obtains changed red mud
Ceramic Balls；
It with mass ratio is that 1:1 is stirred and mixes by the changed red mud Ceramic Balls and stalk, 500 DEG C of pyrolysis 2min are cold
Solidifying, screening obtains the bio oil of deacidification upgrading.
1 distinct methods of table treated red mud ingredient
As can be drawn from Table 1: after processing, Ca and Na content is substantially reduced, and Fe, Al and Ti content increase, more
Be conducive to red mud and play catalytic action.
Embodiment 2
Red mud is taken to dry 4h at 100 DEG C, being ground to partial size is 80 μm；
Red mud after grinding is dissolved in the sulfuric acid solution of 0.2mol/L, the suspension that concentration is 100g/L is formed；
By the suspension to be warming up to 60 DEG C under 5 DEG C/min, 1.5h is kept the temperature in the case where revolving speed is 10r/min, filters, obtains
Red mud after pickling；
Red mud after the pickling is washed with deionized completely, the red mud after being washed；
Ammonium hydroxide will be added in red mud after the washing, adjusting pH is 8, filtering, and 100 DEG C of dry 4h obtain the red of drying
Mud；
The red mud of the drying is mixed with deionized water with mass ratio for 1:2,80 DEG C of stirring 1.5h obtain red mud
Slurries；
The Ceramic Balls that diameter is 2mm are immersed in the red mud slurry, are taken out after 5min, 100 DEG C of dry 12h are obtained red
Mud Ceramic Balls；
The red mud Ceramic Balls are roasted at 600 DEG C, heating rate is 10 DEG C/min, keeps the temperature 4h, obtains changed red mud
Ceramic Balls；
The changed red mud Ceramic Balls are stirred with stalk with mass ratio for 1.5:1 and are mixed, 500 DEG C of pyrolysis 2min,
Condensation, screening, obtains the bio oil of deacidification upgrading.
Embodiment 3
Red mud is taken to dry 6h at 120 DEG C, being ground to partial size is 120 μm；Red mud after grinding is dissolved in the nitre of 1mol/L
In acid solution, the suspension that concentration is 100g/L is formed；
By the suspension to be warming up to 80 DEG C under 20 DEG C/min, 2.2h is kept the temperature in the case where revolving speed is 25r/min, filters, obtains
Red mud after to pickling；
Red mud after the pickling is washed with deionized completely, the red mud after being washed；
Ammonium hydroxide will be added in red mud after the washing, adjusting pH is 8, filtering, and 120 DEG C of dry 6h obtain the red of drying
Mud；
The red mud of the drying is mixed with deionized water with mass ratio for 2:1,100 DEG C of stirring 2.5h are obtained red
Slurry liquid；
The Ceramic Balls that diameter is 2mm are immersed in the red mud slurry, are taken out after 10min, 120 DEG C of dry 36h are obtained red
Mud Ceramic Balls；
The red mud Ceramic Balls are roasted at 600 DEG C, heating rate is 10 DEG C/min, keeps the temperature 4h, obtains changed red mud
Ceramic Balls；
It with mass ratio is that 2:1 is stirred and mixes by the changed red mud Ceramic Balls and stalk, 500 DEG C of pyrolysis 2min are cold
Solidifying, screening obtains the bio oil of deacidification upgrading.
Comparative example 1
It by 500 DEG C of pyrolysis 2min of stalk, condenses, screening obtains bio oil.
Comparative example 2
Red mud is taken to dry 5h at 110 DEG C, being ground to partial size is 100 μm；Red mud after grinding is dissolved in 0.5mol/L's
In hydrogen chloride solution, the suspension that concentration is 100g/L is formed；
By the suspension to be warming up to 70 DEG C under 10 DEG C/min, 2h is kept the temperature in the case where revolving speed is 15r/min, filters, obtains
Red mud after pickling；
Red mud after the pickling is washed with deionized completely, the red mud after being washed；
Ammonium hydroxide will be added in red mud after the washing, adjusting pH is 8, filtering, and 110 DEG C of dry 5h obtain the red of drying
Mud；
The red mud of the drying is mixed with deionized water with mass ratio for 2:1,90 DEG C of stirring 2h obtain red mud slurry
Liquid；
The Ceramic Balls that diameter is 2mm are immersed in the red mud slurry, are taken out after 8min, 110 DEG C of dryings for 24 hours, obtain red
Mud Ceramic Balls；
The red mud Ceramic Balls are roasted at 1000 DEG C, heating rate is 10 DEG C/min, keeps the temperature 4h, obtains changed red mud
Ceramic Balls；
It with mass ratio is that 1:1 is stirred and mixes by the changed red mud Ceramic Balls and stalk, 500 DEG C of pyrolysis 2min are cold
Solidifying, screening obtains the bio oil of deacidification upgrading.
Analysis test result of 2 changed red mud of table under different maturing temperatures
As can be drawn from Table 2: being calcined at 600 DEG C and 800 DEG C respectively, the specific surface of final bio oil obtained
Product, Kong Rong, average pore size are different.
Comparative example 3
Red mud is taken to dry 5h at 110 DEG C, being ground to partial size is 100 μm；
The above-mentioned red mud is mixed with deionized water with mass ratio for 2:1,90 DEG C of stirring 2h obtain red mud slurry
Liquid；
The Ceramic Balls that diameter is 2mm are immersed in the red mud slurry, are taken out after 8min, 110 DEG C of dryings for 24 hours, obtain red
Mud Ceramic Balls；
The red mud Ceramic Balls are roasted at 600 DEG C, heating rate is 10 DEG C/min, keeps the temperature 4h, obtains changed red mud
Ceramic Balls；
The changed red mud ceramics are stirred with stalk with mass ratio for 1:1 and are mixed, 500 DEG C of pyrolysis, screening obtains
The bio oil of deacidification upgrading.
Bio oil component content data made from 3 embodiment 1 of table, comparative example 1,2,3
(note: "-" expression is not detected)
From table 3 can with obtain: the biological oil component of comparative example 1 and comparative example 3 is it is found that 600 DEG C of baking red muds
With good reactivity, carboxylic acid ketonization effect is obvious, and acid content is reduced to 0.9% by being catalyzed preceding 24.04%, ketone content by
22.03% increases to 38.96%, while content increases 2 times or more, and phenols content is increased slightly, alcohol, ester, sugar and aldehyde
Equal ingredients are not detected；
Also there is very big influence to the catalytic effect of bio oil in maturing temperature, comparative example 1 and comparative example 2 roast red
Mud catalysis biological oil result plays a driving role to acid, does not urge it is found that 1000 DEG C of baking red mud acid contents increase to 30.24%
Change degradation, although there is certain catalytic action to ketone, ketonization is not significant.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (10)
1. a kind of method of bio oil deacidification upgrading, which comprises the following steps:
Red mud is dissolved in acid and is heated, the red mud after obtaining pickling；
Red mud by the red mud washing after the pickling, after being washed；
Red mud after the washing is immersed in ammonium hydroxide after adjusting pH value and dried, obtains dry red mud；
The red mud of the drying is mixed with water, obtains red mud slurry；
It is dried after Ceramic Balls are mixed with the red mud slurry, obtains red mud Ceramic Balls；
The red mud Ceramic Balls are roasted, changed red mud Ceramic Balls are obtained；
It is pyrolyzed after the changed red mud Ceramic Balls are mixed with stalk, obtains the bio oil of deacidification upgrading.
2. the method according to claim 1, wherein the acid includes hydrogen chloride, sulfuric acid or nitric acid solution.
3. method according to claim 1 or 2, which is characterized in that the concentration of the acid is 0.2~1mol/L.
4. the method according to claim 1, wherein the amount ratio of the red mud and acid is 1g:5ml~1g:
20ml。
5. the method according to claim 1, wherein the pH value is 8.
6. the method according to claim 1, wherein the red mud of the drying and the mass ratio of water are 1:2~2:
1。
7. the method according to claim 1, wherein the diameter of the Ceramic Balls is 2~5mm.
8. being warming up to the roasting the method according to claim 1, wherein the temperature of the roasting is 600 DEG C
The heating rate of temperature be 10~20 DEG C/min, the soaking time of roasting is 2~4h.
9. the method according to claim 1, wherein the mass ratio of the changed red mud Ceramic Balls and stalk is 1
~2:1.
10. the method according to claim 1, wherein the temperature of the pyrolysis is 450~600 DEG C of times.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110698023A (en) * | 2019-11-26 | 2020-01-17 | 中南大学 | Method for regulating alkalinity of red mud by pyrolyzing agricultural biomass wastes |
| CN111073671A (en) * | 2019-12-24 | 2020-04-28 | 山东理工大学 | Green and cyclic comprehensive utilization method of red mud and lignin waste |
| CN113046104A (en) * | 2021-03-19 | 2021-06-29 | 重庆大学 | Pyrolysis device and pyrolysis method for red mud catalytic biomass infrared pyrolysis |
-
2019
- 2019-03-15 CN CN201910196749.0A patent/CN109748475A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110698023A (en) * | 2019-11-26 | 2020-01-17 | 中南大学 | Method for regulating alkalinity of red mud by pyrolyzing agricultural biomass wastes |
| CN110698023B (en) * | 2019-11-26 | 2021-08-27 | 中南大学 | Method for regulating alkalinity of red mud by pyrolyzing agricultural biomass wastes |
| CN111073671A (en) * | 2019-12-24 | 2020-04-28 | 山东理工大学 | Green and cyclic comprehensive utilization method of red mud and lignin waste |
| CN113046104A (en) * | 2021-03-19 | 2021-06-29 | 重庆大学 | Pyrolysis device and pyrolysis method for red mud catalytic biomass infrared pyrolysis |
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Application publication date: 20190514 |