CN108285163A - A kind of preparation method and application of desiliconization flyash - Google Patents
A kind of preparation method and application of desiliconization flyash Download PDFInfo
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- CN108285163A CN108285163A CN201810075307.6A CN201810075307A CN108285163A CN 108285163 A CN108285163 A CN 108285163A CN 201810075307 A CN201810075307 A CN 201810075307A CN 108285163 A CN108285163 A CN 108285163A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/0693—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process from waste-like raw materials, e.g. fly ash or Bayer calcination dust
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/08—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals with sodium carbonate, e.g. sinter processes
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Abstract
The present invention provides a kind of preparation method and application of desiliconization flyash, and preparation method includes the following steps：1) ball-milling treatment is carried out to high alumina coal gangue, obtains high alumina coal gangue powder；2) calcination processing is carried out to the bastard coal stone powder, obtains aluminous fly-ash；3) aluminous fly-ash is mixed to the sour processing of progress with acidizer solution, filter cake is filtered, washed, obtains sour treated coal ash；4) the sour treated coal ash is mixed with sodium hydroxide solution and carries out pre-desiliconizing processing, filtering washs filter cake, obtains desiliconization flyash；Wherein, the alumina silica ratio of the desiliconization flyash is 3.2 3.8.The desiliconization flyash that alumina silica ratio is 3.2 3.8 can be prepared in preparation method by raw material of gangue, and preparation process is simple to operation, and manufacturing cost is low.
Description
Technical field
The present invention relates to a kind of preparation method and application of desiliconization flyash, belong to high alumina coal gangue recycling neck
Domain.
Background technology
Gangue is that a kind of phosphorus content with coal seam association in coal forming process is relatively low, the black gray expandable rock harder than coal
Stone, preservation are mixed in coal seam, are discharged as a kind of solid waste in progress of coal mining.The coal of stockpiling is accumulated for many years
Spoil occupies a large amount of soils, influences local environment, long-term huge damage will be caused to environment if not being used.
With the worsening shortages of China's bauxite resource, oxygen is extracted using industrial solid castoffs such as flyash, gangues
Change aluminium to be increasingly valued by people.Due to special geologic setting, in Late Paleozoic In The Ordos Basin coal seam and dirt band
Rich in the mineral such as boehmite and kaolinite, alumina content is up to 50% or so in generated flyash after burning, with
Alumina content is suitable in medium grade alumyte, is a kind of very valuable alumina producing raw material.According to statistics, in the Inner Mongol
The potential reserve of west area high alumina coal gangue is up to 18,000,000,000 tons.Therefore in these high alumina coal gangue resources of comprehensive development and utilization
Aluminium element silicon, can not only ensure the strategic security of China's aluminum i ndustry, also helping local environmental protection and development has
The circular economy industrial of own strategic significance.
In recent years, major universities and colleges of China and R＆D institution had actively developed grinding for high alumina coal gangue resource utilization process
Study carefully, mainly utilize the endowment of resources of the high silicon of its high alumina, for extracting the important directions that aluminium oxide is its application, but due to height
Aluminium gangue initial aluminum silicon is relatively low, cannot be used directly for alumina producing, it is therefore necessary to which first carrying out pre-desiliconizing processing could add
To utilize.Existing pre-desiliconizing treatment technology is substantially all made of under the conditions of middle pressure and is directly added into lye and aluminous fly-ash is mixed
It closes and carries out pre-desiliconizing, flyash alumina silica ratio can only achieve 2.0 or so after desiliconization at present, and desilication efficiency is not high, to subsequent production work
Skill technical indicator is affected, and there is the problems such as high primary investment, high energy consumption.Therefore, the aluminium of desiliconization flyash how is improved
Silicon ratio becomes urgent problem in current high alumina coal gangue recycling.
Invention content
The present invention provides a kind of preparation method and application of desiliconization flyash, which can be using gangue as raw material
The desiliconization flyash that alumina silica ratio is 3.2-3.8 is prepared, and preparation process is simple to operation, manufacturing cost is low.
The present invention provides a kind of preparation method of desiliconization flyash, includes the following steps：
1) ball-milling treatment is carried out to high alumina coal gangue, obtains high alumina coal gangue powder；
2) calcination processing is carried out to the bastard coal stone powder, obtains aluminous fly-ash；
3) aluminous fly-ash is mixed to the sour processing of progress with acidizer solution, filter cake is filtered, washed, obtains sour place
Manage flyash；
4) the sour treated coal ash is mixed with sodium hydroxide solution and carries out pre-desiliconizing processing, filtering is washed filter cake, obtained
To desiliconization flyash；
Wherein, the alumina silica ratio of the desiliconization flyash is 3.2-3.8.
Preparation method provided by the invention is using high alumina coal gangue as raw material, wherein high alumina coal gangue refers to the matter of aluminium oxide
Measure the gangue that content is more than 40%.
A large amount of kaolin and boehmite mine are mainly contained in high alumina coal gangue, it can will be high by medium temperature calcine technology
Ridge soil and boehmite are converted into mullite and corundum phase and segment glass phase, wherein glass mutually contains a large amount of amorphous states
Silica and a small amount of amorphous oxide aluminium.In conventional pre-desiliconizing reaction process, the crystalline state in aluminous fly-ash is not
Carry out stone and corundum does not react mutually with lye, and amorphous silicon di-oxide and aluminium oxide in the glass phase in aluminous fly-ash
Sodalite type aluminic acid hydrochlorate can be formed after alkaline leaching immediately simultaneously, the liquid-phase silicone so as to cause lye removing reenters admittedly
Phase, therefore the alumina silica ratio of the desiliconization flyash after conventional pre-desiliconizing with high alumina fly ash can only achieve 2.0-2.4 or so.
The present inventor the study found that can leach the oxidation in glass phase by pickle in atmospheric conditions
Aluminium, and amorphous silicon di-oxide does not react with pickle, therefore acid processing can make the amorphous state dioxy in glass phase
SiClx and aluminium oxide are separated with mullite and corundum, to form sodalite phase in desiliconization flyash, finally make to take off
The alumina silica ratio of silica flour coal ash has been improved by existing 2.0-2.4 between 3.2-3.8.
Therefore, alumina silica ratio can be finally prepared as the desiliconization powder of 3.2-3.8 in the present invention using high alumina coal gangue as raw material
Coal ash.
Hereinafter, the preparation method to the present invention carries out detailed explanation and introduction.
The purpose for carrying out ball-milling treatment in step 1) to raw material high alumina coal gangue is to carry out mechanical activation to high alumina coal gangue,
To improve the specific surface area of high alumina coal gangue.
In specific implementation step 1) when, ball mill may be used, ball-milling treatment is carried out to high alumina coal gangue, it is preferred that can be with
High alumina coal gangue is milled to the high alumina coal gangue powder that grain size is 5-25 μm.
The purpose of calcination processing in step 2) is to convert high alumina coal gangue to aluminous fly-ash, can be in calcining
The high alumina coal gangue powder that step 1) obtains is placed in Muffle furnace or fluidized bed furnace and carries out calcination processing.Wherein, it controls at calcining
The temperature of reason is 950-1030 DEG C, and the time for controlling calcination processing is 0.5-2h.
After calcination processing, the aluminous fly-ash of generation is taken out from Muffle furnace or fluidized bed furnace, is cooled to room temperature
Carry out the processing of step 3) again afterwards.
The acid processing of step 3) is processing step more crucial in the present invention.
Specifically, acid processing is mix generation instead with the aluminous fly-ash in step 2) using acidizer solution
It answers, make the alumina leaching in aluminous fly-ash and the amorphous silicon di-oxide in aluminous fly-ash is prevented to dissolve, to prevent
Aluminous fly-ash generates sodalite type aluminic acid hydrochlorate in pre-desiliconizing, to improve the alumina silica ratio of desiliconization flyash.
Wherein, acidizer solution is the aqueous solution of acidizer, and matter of the acidizer in acidizer solution
Measure a concentration of 3-18%；Acidizer can select common acid solution, such as sulfuric acid, hydrochloric acid, phosphoric acid and nitric acid, and this hair
The bright quantity for being not intended to limit acidizer type, can be the aqueous solution of any one of above-mentioned acid solution, can also be above-mentioned acid
The aqueous solution of two or more mix acid liquor in liquid, for example, acidizer can be in hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid
It is any, can also be the mixture of hydrochloric acid and sulfuric acid, can also be the mixture of hydrochloric acid, phosphoric acid, nitric acid.And at acid
When managing the mixture that agent is a variety of acid solutions, the present invention is not intended to limit the ratio between each acid solution.
In addition, needing heat temperature raising after mixing aluminous fly-ash with acidizer solution, that is to say, that acid, which is handled, is
It carries out at a certain temperature.By the research of inventor, controlled between 60-95 DEG C when by the temperature of acid processing, and
It, being capable of the maximum effect for playing acid processing by the time control of acid processing between 0.5-3h.
When sour after treatment, the reaction system to acid processing is needed to be filtered, and washed to filter cake using water
It washs, in general, the mass ratio of control slurry and filter cake is (1.2-1.8):1, filter cake is sour treated coal ash.Wherein,
Slurry is 90 DEG C, and slurry can be distilled water or tap water, and 90 DEG C can be directly used in order to reduce cost
Tap water filter cake is washed.And the filtrate after washing can be used as acidizer solution to recycle after mending acidizer
It utilizes, reduces manufacturing cost.
Step 4) is to carry out pre-desiliconizing processing to sour treated coal ash.
Identical as conventional pre-desiliconizing processing, the present invention mixes sour treated coal ash with sodium hydrate aqueous solution, to
To desiliconization flyash.
Wherein, the mass concentration of sodium hydroxide solution is 5-25%, the quality of sodium hydroxide solution and sour treated coal ash
Than for (2.5-6.0):1, that is to say, that the sour treated coal ash for often handling 1kg needs the sodium hydroxide of (2.5-6.0) kg molten
Liquid.
In addition, needing heat temperature raising after mixing sour treated coal ash with sodium hydroxide solution, that is to say, that pre-desiliconizing
Processing carries out at a certain temperature.In the present invention, the temperature of pre-desiliconizing processing is 60-135 DEG C, pre-desiliconizing processing
Time is 0.5-6h.
When pre-desiliconizing after treatment, the reaction system handled pre-desiliconizing is needed to be filtered, and using water to filter
Cake is washed, in general, the mass ratio of control slurry and filter cake is (0.9-1.1):1, filter cake is desiliconization flyash.
Wherein, slurry is 90 DEG C, and slurry can be distilled water or tap water, can directly be used to reduce cost
90 DEG C of tap water washs filter cake.And the filtrate after washing can also recycle, on the one hand filtrate can be used for
It prepares active calcium silicate or prepares 4A zeolite molecular sieves, it is molten on the other hand can be concentrated to give sodium hydroxide after causticization processing
Liquid is re-used in the pre-desiliconizing processing of sour treated coal ash.
The present invention also provides a kind of preparation method answering in extracting aluminium oxide of any of the above-described desiliconization flyash
With.
Application in extraction aluminium oxide as described above, wherein can be using the desiliconization flyash of the present invention as sintering process
The raw material of aluminium oxide is extracted, the raw material of aluminium oxide can also be extracted using the desiliconization flyash of the present invention as Bayer process.
The preparation method of the desiliconization flyash of the present invention first lives high alumina coal gangue machinery using high alumina coal gangue as raw material
Change obtains high alumina coal gangue powder, then calcines high alumina coal gangue powder progress medium temperature to obtain aluminous fly-ash, then to high alumina
Flyash carries out sour processing, and finally using with conventional pre-desiliconizing mode, treated that flyash carries out desiliconization to sour, to obtain
Alumina silica ratio is the desiliconization flyash of 3.2-3.8, substantially increases the alumina silica ratio of flyash, and it is original to improve with high alumina coal gangue
The recovery rate of material extraction aluminium oxide, to make the maximum resource utilization of high alumina coal gangue.
With original process route for being directly added into lye in aluminous fly-ash and carry out pre-desiliconizing under the conditions of middle pressure
It compares, implementation of the invention has the following advantages：
1) desiliconization flyash alumina silica ratio of the invention greatly improves, by existing 2.0-2.4 improved 3.2-3.8 it
Between, desilication efficiency is high；
2) equipment that the process uses has conventional equipment, is not required to additionally develop non-standard equipment, reduces equipment investment
Cost；
3) pickle used is handled, and, easy to operate, slurry small to the extent of corrosion of equipment is used under condition of normal pressure
Amount is few, and the acid loss of separation process is smaller.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment of the present invention, to this hair
Technical solution in bright is clearly and completely described, it is clear that and described embodiments are some of the embodiments of the present invention, and
The embodiment being not all of.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work
Under the premise of the every other embodiment that is obtained, shall fall within the protection scope of the present invention.
Embodiment 1
The preparation method of the present embodiment desiliconization flyash includes the following steps：
1) mechanical activation
200 grams of high alumina coal gangues are taken, with being taken out after ball mill ball milling 2.0h, obtain high alumina coal gangue powder, it after tested, should
The average grain diameter of high alumina coal gangue powder is 15.64 μm；
2) calcination processing
The high alumina coal gangue powder of step 1) is put into Muffle furnace and carries out calcination processing, obtains aluminous fly-ash；
Wherein, the temperature of calcination processing is 950 DEG C, and the time of calcination processing is 1.0h；
Obtained aluminous fly-ash is detected, it is as a result as follows：
The mass content of aluminium oxide is 49.25%；
The mass content of silica is 40.98%；
Alumina silica ratio is 1.20；
3) acid processing
The aluminous fly-ash of step 2) is mixed to the sour processing of progress with 600ml acidizer solution, sour after treatment is right
Reaction system is filtered, and using tap water to Washing of Filter Cake, and the filter cake after washing is obtained sour treated coal ash；
Wherein, the mass ratio of acidizer solution and aluminous fly-ash is 3:1；
Acidizer solution is the solution of sulfuric acid and water, and the mass concentration of sulfuric acid is 10.0%；
The treatment temperature of acid processing is 85 DEG C, and the processing time of acid processing is 1.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 240ml originally water washing filter cakes, filtrate and washes
Acidizer solution can be used as to recycle after the concentrated benefit acid of liquid.
4) pre-desiliconizing is handled
The sour treated coal ash of step 3) is mixed with 500ml sodium hydroxide solutions and carries out pre-desiliconizing processing, at pre-desiliconizing
After reason, reaction system is filtered, and Washing of Filter Cake is dried the filter cake after washing at 105 DEG C using tap water
It is dry to get to the desiliconization flyash of the present embodiment；
Wherein, in sodium hydroxide solution, the mass concentration of sodium hydroxide is 12.0%；
The treatment temperature of pre-desiliconizing processing is 95 DEG C, and the processing time of pre-desiliconizing processing is 4.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 200ml originally water washing filter cakes；
Alumina silica ratio detection is carried out to the desiliconization flyash of the present embodiment, it is as a result as follows：
The alumina silica ratio of the desiliconization flyash of the present embodiment is 3.46.
Embodiment 2
The preparation method of the present embodiment desiliconization flyash includes the following steps：
1) mechanical activation
200 grams of high alumina coal gangues are taken, with being taken out after ball mill ball milling 3.0h, obtain high alumina coal gangue powder, it after tested, should
The average grain diameter of high alumina coal gangue powder is 9.48 μm；
2) calcination processing
The high alumina coal gangue powder of step 1) is put into Muffle furnace and carries out calcination processing, obtains aluminous fly-ash；
Wherein, the temperature of calcination processing is 1000 DEG C, and the time of calcination processing is 1.5h；
Obtained aluminous fly-ash is detected, it is as a result as follows：
The mass content of aluminium oxide is 49.25%；
The mass content of silica is 40.98%；
Alumina silica ratio is 1.20；
3) acid processing
The aluminous fly-ash of step 2) is mixed to the sour processing of progress with 700ml acidizer solution, sour after treatment is right
Reaction system is filtered, and using tap water to Washing of Filter Cake, and the filter cake after washing is obtained sour treated coal ash；
Wherein, the mass ratio of acidizer solution and aluminous fly-ash is 3.5:1；
Acidizer solution is the solution of hydrochloric acid and water, and the mass concentration of hydrochloric acid is 7.5%；
The treatment temperature of acid processing is 90 DEG C, and the processing time of acid processing is 2.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 270ml originally water washing filter cakes, filtrate and washes
Acidizer solution can be used as to recycle after the concentrated benefit acid of liquid.
4) pre-desiliconizing is handled
The sour treated coal ash of step 3) is mixed with 600ml sodium hydroxide solutions and carries out pre-desiliconizing processing, at pre-desiliconizing
After reason, reaction system is filtered, and Washing of Filter Cake is dried the filter cake after washing at 105 DEG C using tap water
It is dry to get to the desiliconization flyash of the present embodiment；
Wherein, in sodium hydroxide solution, the mass concentration of sodium hydroxide is 15.0%；
The treatment temperature of pre-desiliconizing processing is 105 DEG C, and the processing time of pre-desiliconizing processing is 2.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 180ml originally water washing filter cakes；
Alumina silica ratio detection is carried out to the desiliconization flyash of the present embodiment, it is as a result as follows：
The alumina silica ratio of the desiliconization flyash of the present embodiment is 3.71.
Embodiment 3
The preparation method of the present embodiment desiliconization flyash includes the following steps：
1) mechanical activation
200 grams of high alumina coal gangues are taken, with being taken out after ball mill ball milling 1.0h, obtain high alumina coal gangue powder, it after tested, should
The average grain diameter of high alumina coal gangue powder is 23.15 μm；
2) calcination processing
The high alumina coal gangue powder of step 1) is put into Muffle furnace and carries out calcination processing, obtains aluminous fly-ash；
Wherein, the temperature of calcination processing is 1020 DEG C, and the time of calcination processing is 1.0h；
Obtained aluminous fly-ash is detected, it is as a result as follows：
The mass content of aluminium oxide is 49.25%；
The mass content of silica is 40.98%；
Alumina silica ratio is 1.20；
3) acid processing
The aluminous fly-ash of step 2) is mixed to the sour processing of progress with 800ml acidizer solution, sour after treatment is right
Reaction system is filtered, and using tap water to Washing of Filter Cake, and the filter cake after washing is obtained sour treated coal ash；
Wherein, the mass ratio of acidizer solution and aluminous fly-ash is 4.0:1；
Acidizer solution is the solution of hydrochloric acid and water, and the mass concentration of hydrochloric acid is 10.0%；
The treatment temperature of acid processing is 80 DEG C, and the processing time of acid processing is 3.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 280ml originally water washing filter cakes, filtrate and washes
Acidizer solution can be used as to recycle after the concentrated benefit acid of liquid.
4) pre-desiliconizing is handled
The sour treated coal ash of step 3) is mixed with 700ml sodium hydroxide solutions and carries out pre-desiliconizing processing, at pre-desiliconizing
After reason, reaction system is filtered, and Washing of Filter Cake is dried the filter cake after washing at 105 DEG C using tap water
It is dry to get to the desiliconization flyash of the present embodiment；
Wherein, in sodium hydroxide solution, the mass concentration of sodium hydroxide is 9.0%；
The treatment temperature of pre-desiliconizing processing is 80 DEG C, and the processing time of pre-desiliconizing processing is 6.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 210ml originally water washing filter cakes；
Alumina silica ratio detection is carried out to the desiliconization flyash of the present embodiment, it is as a result as follows：
The alumina silica ratio of the desiliconization flyash of the present embodiment is 3.23.
Embodiment 4
The preparation method of the present embodiment desiliconization flyash includes the following steps：
1) mechanical activation
200 grams of high alumina coal gangues are taken, with being taken out after ball mill ball milling 2.0h, obtain high alumina coal gangue powder, it after tested, should
The average grain diameter of high alumina coal gangue powder is 15.64 μm；
2) calcination processing
The high alumina coal gangue powder of step 1) is put into Muffle furnace and carries out calcination processing, obtains aluminous fly-ash；
Wherein, the temperature of calcination processing is 950 DEG C, and the time of calcination processing is 1.0h；
Obtained aluminous fly-ash is detected, it is as a result as follows：
The mass content of aluminium oxide is 49.25%；
The mass content of silica is 40.98%；
Alumina silica ratio is 1.20；
3) acid processing
The aluminous fly-ash of step 2) is mixed to the sour processing of progress with 700ml acidizer solution, sour after treatment is right
Reaction system is filtered, and using tap water to Washing of Filter Cake, and the filter cake after washing is obtained sour treated coal ash；
Wherein, the mass ratio of acidizer solution and aluminous fly-ash is 3.5:1；
Acidizer solution is the mixed of the sulfuric acid of 300ml mass concentrations 12% and the hydrochloric acid of 400ml mass concentrations 8% and water
Close solution；
The treatment temperature of acid processing is 80 DEG C, and the processing time of acid processing is 1.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 280ml originally water washing filter cakes, filtrate and washes
Acidizer solution can be used as to recycle after the concentrated benefit acid of liquid.
4) pre-desiliconizing is handled
The sour treated coal ash of step 3) is mixed with 500ml sodium hydroxide solutions and carries out pre-desiliconizing processing, at pre-desiliconizing
After reason, reaction system is filtered, and Washing of Filter Cake is dried the filter cake after washing at 105 DEG C using tap water
It is dry to get to the desiliconization flyash of the present embodiment；
Wherein, in sodium hydroxide solution, the mass concentration of sodium hydroxide is 12%；
The treatment temperature of pre-desiliconizing processing is 90 DEG C, and the processing time of pre-desiliconizing processing is 3.0h；
Filter operation specifically uses isolated by vacuum filtration, then uses 90 DEG C of 220ml originally water washing filter cakes；
Alumina silica ratio detection is carried out to the desiliconization flyash of the present embodiment, it is as a result as follows：
The alumina silica ratio of the desiliconization flyash of the present embodiment is 3.54.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of preparation method of desiliconization flyash, which is characterized in that include the following steps：
1) ball-milling treatment is carried out to high alumina coal gangue, obtains high alumina coal gangue powder；
2) calcination processing is carried out to the bastard coal stone powder, obtains aluminous fly-ash；
3) aluminous fly-ash is mixed to the sour processing of progress with acidizer solution, is filtered, washed filter cake, obtains acid processing powder
Coal ash；
4) the sour treated coal ash is mixed with sodium hydroxide solution and carries out pre-desiliconizing processing, filtering is washed filter cake, taken off
Silica flour coal ash；
Wherein, the alumina silica ratio of the desiliconization flyash is 3.2-3.8.
2. the preparation method of desiliconization flyash according to claim 1, which is characterized in that the grain size of the high alumina coal gangue
It is 5-25 μm.
3. the preparation method of desiliconization flyash according to claim 1, which is characterized in that the temperature of the calcination processing is
950-1030 DEG C, the time of the calcination processing is 0.5-2h.
4. the preparation method of desiliconization flyash according to claim 1, which is characterized in that the acidizer solution is acid
The aqueous solution of inorganic agent, the acidizer are one or more in sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid；The acid processing
In agent solution, the mass concentration of the acidizer is 3-18%；
The mass ratio of the acidizer solution and the aluminous fly-ash is (2.5-5.0):1.
5. the preparation method of desiliconization flyash according to claim 4, which is characterized in that it is described acid processing temperature be
60-95 DEG C, the time of the acid processing is 0.5-3h.
6. the preparation method of desiliconization flyash according to claim 5, which is characterized in that in step 3), be washed with water
The mass ratio of the filter cake and the water and the filter cake is (1.2-1.8):1.
7. the preparation method of desiliconization flyash according to claim 1, which is characterized in that the matter of the sodium hydroxide solution
A concentration of 5-25% is measured, the mass ratio of the sodium hydroxide solution and the sour treated coal ash is (2.5-6.0):1.
8. the preparation method of desiliconization flyash according to claim 7, which is characterized in that the temperature of the pre-desiliconizing processing
It it is 60-135 DEG C, the time of the pre-desiliconizing processing is 0.5-6h.
9. the preparation method of desiliconization flyash according to claim 8, which is characterized in that in step 4), be washed with water
The mass ratio of the filter cake and the water and the filter cake is (0.9-1.1):1.
10. application of the preparation method of any desiliconization flyash of claim 1-9 in extracting aluminium oxide.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111517344A (en) * | 2020-05-15 | 2020-08-11 | 中能化江苏地质矿产设计研究院有限公司 | Method for extracting aluminum from coal ash |
| CN113061733A (en) * | 2021-03-19 | 2021-07-02 | 大连理工大学 | Method for preparing aluminum-rich leaching solution by using fly ash sintering activation-acid leaching method |
| CN115340391A (en) * | 2021-05-14 | 2022-11-15 | 中国科学院过程工程研究所 | Desiliconized fly ash and preparation method and application thereof |
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| CN105523561A (en) * | 2016-01-19 | 2016-04-27 | 内蒙古日盛可再生资源有限公司 | Method for efficiently desilicating high alumina coal gangue |
| CN106220190A (en) * | 2015-11-12 | 2016-12-14 | 中国科学院过程工程研究所 | A kind of method utilizing aluminous fly-ash to prepare mullite |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106220190A (en) * | 2015-11-12 | 2016-12-14 | 中国科学院过程工程研究所 | A kind of method utilizing aluminous fly-ash to prepare mullite |
| CN105523561A (en) * | 2016-01-19 | 2016-04-27 | 内蒙古日盛可再生资源有限公司 | Method for efficiently desilicating high alumina coal gangue |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517344A (en) * | 2020-05-15 | 2020-08-11 | 中能化江苏地质矿产设计研究院有限公司 | Method for extracting aluminum from coal ash |
| CN113061733A (en) * | 2021-03-19 | 2021-07-02 | 大连理工大学 | Method for preparing aluminum-rich leaching solution by using fly ash sintering activation-acid leaching method |
| CN115340391A (en) * | 2021-05-14 | 2022-11-15 | 中国科学院过程工程研究所 | Desiliconized fly ash and preparation method and application thereof |
| CN115340391B (en) * | 2021-05-14 | 2023-10-20 | 中国科学院过程工程研究所 | Desilication fly ash and preparation method and application thereof |
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