CN107416874A - A kind of dealkalization method of coal ash lifting aluminium slag - Google Patents
A kind of dealkalization method of coal ash lifting aluminium slag Download PDFInfo
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- CN107416874A CN107416874A CN201610350145.3A CN201610350145A CN107416874A CN 107416874 A CN107416874 A CN 107416874A CN 201610350145 A CN201610350145 A CN 201610350145A CN 107416874 A CN107416874 A CN 107416874A
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- coal ash
- aluminium slag
- lifting aluminium
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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 invention provides a kind of dealkalization method of coal ash lifting aluminium slag, comprise the following steps：1) coal ash lifting aluminium slag addition sodium carbonate liquor is stirred into slurry；2) slurry for obtaining step 1) adds reactor and carries out de-alkali reaction；3) by the slurries filtration after de-alkali reaction, filtrate and filter cake are obtained；4) filter cake is carried out into multi-stage countercurrent with water to wash, dealkalize slag is obtained after cleaning.The present invention is applied to processing wet method and the alkaline residue using silicic acid hydrogen sodium calcium as main component obtained after aluminum oxide, after dealkalize is handled, Na in coal ash lifting aluminium slag is extracted from flyash2O content is reduced to 1% or so by 17% or so, and dealkalize slag can be used for production calcium silicate insulation or calcium silicate board.There is no low-concentration alkali liquor generation in process of the present invention, technique is simple, and energy consumption is low, suitable for industrialized production, and can realize the higher value application of silicon components in flyash, and coal ash lifting aluminium slag can be avoided to form secondary pollution to environment again.
Description
Technical field
The present invention relates to a kind for the treatment of technology of solid waste, more particularly to a kind of dealkalize side of coal ash lifting aluminium slag
Method.
Background technology
China's bauxite resource worsening shortages, the high alumina coal resource and the ground such as China Inner Mongol, Shanxi is richly stored with,
According to statistics, the content 50% or so of nearly 15,000,000,000 tons of aluminous fly-ash, wherein aluminum oxide will be produced after high alumina coal power generation,
This, equivalent to the content of aluminum oxide in the medium grade alumyte in China, is a kind of very valuable alumina producing raw material.
As China's bauxite resource supplies contradiction, contain extraction oxidation in bauxite resource from aluminous fly-ash etc. is other
Aluminium is increasingly valued by people.
At present, mainly there are acid system, sintering process, ammonium sulfate method, wet method etc. in China from flyash extraction aluminum oxide technology.
Wherein there is the shortcomings of equipment corrosion is serious, acid medium recovery is difficult, product quality can not be up to standard in acid system；Sintering process
The shortcomings of sintering temperature height, high energy consumption, big tailings amount be present；Equipment enlarging difficulty, tailings be present in ammonium sulfate method
The shortcomings of amount is big, ammonia emission amount is big.And a kind of alkali wet method of Chinese Academy Of Sciences Process Engineering Research Institute's invention is from powder
The method (Chinese patent CN102476820A) of aluminum oxide is extracted in coal ash, there is provided low temperature under a kind of alkaline medium
The method that wet method extracts aluminum oxide from aluminous fly-ash, gentle with reaction condition, energy consumption is low, alumina leaching
Rate is high, level of residue it is small and can be used as building materials raw material (such as Chinese patent application CN104276578A and
CN105198308A) the advantages that, ton demonstration project and continuously operation 18 days has been built up, has been received extensively
Concern, such as Chinese patent CN103303952A, CN103663516A, CN103708479A and Chinese patent
Apply for patent disclosed in CN104030331A etc..
Coal ash lifting aluminium slag alkali content caused by above-mentioned alkali wet method is high, needs to carry out at dealkalize before as building materials raw material
Reason, and reclaim alkaline media.Chinese patent CN102476820A, CN103708479A and Chinese patent application
CN104276578A, CN105198308A will be carried in aluminium slag addition diluted sodium hydroxide solution and be carried out de-alkali reaction,
Wherein Chinese patent CN102476820A uses 0~80g/L diluted sodium hydroxide solution, Chinese patent application
CN104276578A uses Na2O concentration is 0.1~40g/L diluted sodium hydroxide solutions, Chinese patent application
CN105198308A uses 1~50g/L diluted sodium hydroxide solutions, and Chinese patent CN103708479A uses hydrogen-oxygen
Change the diluted sodium hydroxide solution that sodium mass concentration is 3%~8%；And Chinese patent CN103303952A and
CN103663516A will put forward aluminium slag and add water to carry out hydro-thermal reaction removing sodium.So far, coal ash lifting caused by wet method
The dealkalization method of aluminium slag uses diluted sodium hydroxide solution or water, there is not yet using higher concentration aqueous slkali or sodium carbonate
The report of solution, existing method can produce a large amount of diluted sodium hydroxide solutions, cause alkaline media to recycle difficult,
To return to flyash pre-desiliconizing or putting forward aluminium system, it is necessary to be evaporated raising concentration, it evaporates low-concentration alkali liquor
Water is big, high energy consumption, it is difficult to industrializes.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided a kind of dealkalization method of coal ash lifting aluminium slag,
Coal ash lifting aluminium slag is added Na by this method2The high concentration carbon acid sodium solution that O mass concentrations are 70~200g/L is carried out
De-alkali reaction, after dealkalize is handled, Na in coal ash lifting aluminium slag2O content is reduced to 1% or so by 17% or so,
Dealkalize slag can be used for production calcium silicate insulation or calcium silicate board.Because sodium carbonate liquor concentration is high, in circulation profit
Used time evaporation capacity is small.In addition, using sodium carbonate as reaction medium when, there occurs larger for dealkalize product microstructure
Change, not only product wash water dosage is greatly reduced, and the liquid-solid ratio of de-alkali reaction can also be greatly reduced.Therefore,
New method energy consumption is greatly reduced, and economy and facility, can be widely applied for industrialized production.
To reach above-mentioned purpose, the invention provides a kind of dealkalization method of coal ash lifting aluminium slag, this method is included such as
Lower step：
1) dispensing：By coal ash lifting aluminium slag and Na2O mass concentrations are that 70~200g/L sodium carbonate liquor is mixed into
Slurry, the liquid-solid ratio of slurry are that the ratio of liquid volume and solid masses is 6~20mL/g；
2) de-alkali reaction：The slurry that step 1) is obtained is added in reactor, is stirred and is heated to 80~220 DEG C,
0.5~8h is reacted at this temperature；
3) discharge：Reactor in step 2) is cooled down, pressure is down to normal pressure, and reacted slurries filtration obtains
To filtrate and filter cake；
4) wash：Filter cake is carried out into multi-stage countercurrent with water to wash, wash water temperature is 60~90 DEG C, dealkalize slag after washing
For producing calcium silicate insulation or calcium silicate board.
Further, in the step 1) coal ash lifting aluminium slag be wet method from flyash extract aluminum oxide after gained with
Silicic acid hydrogen sodium calcium is the alkaline residue of main component.
Further, stir speed (S.S.) is 10~500r/min in the step 2).
Further, the pressure of reaction is 0~2.3MPa in the step 2).
Compared with prior art, the present invention has following obvious superiority：
1) alkaline media is easy to recycle：This method uses Na2O mass concentrations are 70~200g/L high concentration carbon
Acid sodium solution carries out de-alkali reaction, is produced without sig water, and high concentration alkali medium is easy to recycle.
2) energy consumption is greatly reduced：This method uses Na2O mass concentrations are that 70~200g/L high concentration sodium carbonate is molten
Liquid carries out de-alkali reaction, and technological process is short, and without sig water evaporation technology, energy consumption is greatly reduced, economy and facility,
It can be widely applied to industrialized production.
3) dealkalize efficiency high：Na in coal ash lifting aluminium slag2O content is reduced to 1% or so by 17% or so, dealkalize
Rate is up to 95% or so, and dealkalize slag can be used for production calcium silicate insulation or calcium silicate board, can be achieved to put forward aluminium slag i.e.
The higher value application of silicon components in flyash.
Brief description of the drawings
Fig. 1 is a kind of process flow diagram of the dealkalization method of coal ash lifting aluminium slag of the present invention.
Embodiment
With reference to the several specific embodiments of the present invention, the present invention is described in more detail, but following examples only limit
In explaining the present invention, the scope of the present invention is not intended to limit, interest field of the invention is with claims
It is defined.
Embodiment 1
Raw material is used exemplified by putting forward aluminium slag obtained by the aluminous fly-ash wet underwater welding aluminum oxide of Inner Mongol somewhere, its primary chemical
Weight/mass percentage composition (%) such as following table of composition：
By coal ash lifting aluminium slag and Na2O mass concentrations are that 70g/L sodium carbonate liquor is mixed into slurry, the liquid of slurry
Gu the ratio that ratio is liquid volume and solid masses is 6mL/g.Obtained slurry is added in reactor, stirring is simultaneously
80 DEG C are heated to, reacts 8h, reaction pressure 0MPa, stir speed (S.S.) 10r/min at this temperature.After reaction
Reactor is cooled down, pressure is down to normal pressure, and by reacted slurries filtration, filter cake carries out multi-stage countercurrent with water and washed,
Dealkalize slag is obtained, temperature of washing water is 60 DEG C.After dealkalize slag is dried, its sodium oxide molybdena percentage composition is analyzed as 1.55%.
Embodiment 2
By the coal ash lifting aluminium slag and Na of embodiment 12O mass concentrations are that 100g/L sodium carbonate liquor is mixed into slurry
Material, the liquid-solid ratio of slurry are that the ratio of liquid volume and solid masses is 8mL/g.Obtained slurry is added and reacted
In device, stir and be heated to 160 DEG C, react 6h, reaction pressure 0.8MPa at this temperature, stir speed (S.S.) is
300r/min.Reactor is cooled down after reaction, pressure is down to normal pressure, and reacted slurries filtration, obtains washing
Dealkalize slag, temperature of washing water are 70 DEG C.After dealkalize slag is dried, its sodium oxide molybdena percentage composition is analyzed as 0.96%.
Embodiment 3
By the coal ash lifting aluminium slag and Na of embodiment 12O mass concentrations are that 150g/L sodium carbonate liquor is mixed into slurry
Material, the liquid-solid ratio of slurry are that the ratio of liquid volume and solid masses is 10mL/g.Obtained slurry is added and reacted
In device, stir and be heated to 200 DEG C, react 2h, reaction pressure 1.6MPa at this temperature, stir speed (S.S.) is
500r/min.Reactor is cooled down after reaction, pressure is down to normal pressure, and reacted slurries filtration, obtains washing
Dealkalize slag, temperature of washing water are 80 DEG C.After dealkalize slag is dried, its sodium oxide molybdena percentage composition is analyzed as 1.14%.
Embodiment 4
By the coal ash lifting aluminium slag and Na of embodiment 12O mass concentrations are that 200g/L sodium carbonate liquor is mixed into slurry
Material, the liquid-solid ratio of slurry are that the ratio of liquid volume and solid masses is 20mL/g.Obtained slurry is added and reacted
In device, stir and be heated to 220 DEG C, react 0.5h, reaction pressure 2.3MPa, stir speed (S.S.) at this temperature
For 200r/min.Reactor is cooled down after reaction, pressure is down to normal pressure, and reacted slurries filtration washs,
Dealkalize slag is obtained, temperature of washing water is 90 DEG C.After dealkalize slag is dried, its sodium oxide molybdena percentage composition is analyzed as 1.88%.
Embodiment 5
By the coal ash lifting aluminium slag and Na of embodiment 12O mass concentrations are that 120g/L sodium carbonate liquor is mixed into slurry
Material, the liquid-solid ratio of slurry are that the ratio of liquid volume and solid masses is 15mL/g.Obtained slurry is added and reacted
In device, stir and be heated to 140 DEG C, react 3h, reaction pressure 0.4MPa at this temperature, stir speed (S.S.) is
400r/min.Reactor is cooled down after reaction, pressure is down to normal pressure, and reacted slurries filtration, obtains washing
Dealkalize slag, temperature of washing water are 75 DEG C.After dealkalize slag is dried, its sodium oxide molybdena percentage composition is analyzed as 1.05%.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although
The present invention is described in detail with reference to embodiment, it will be apparent to an ordinarily skilled person in the art that to the present invention
Technical scheme modify or equivalent substitution, without departure from the spirit and scope of technical solution of the present invention, its is equal
It should cover among scope of the presently claimed invention.
Claims (4)
1. a kind of dealkalization method of coal ash lifting aluminium slag, comprises the following steps：
1) dispensing：By coal ash lifting aluminium slag and Na2O mass concentrations are that 70~200g/L sodium carbonate liquor is mixed into
Slurry, the liquid-solid ratio of slurry are that the ratio of liquid volume and solid masses is 6~20mL/g；
2) de-alkali reaction：The slurry that step 1) is obtained is added in reactor, is stirred and is heated to 80~220 DEG C,
0.5~8h is reacted at this temperature；
3) discharge：Reactor in step 2) is cooled down, pressure is down to normal pressure, and reacted slurries filtration obtains
To filtrate and filter cake；
4) wash：Filter cake is carried out into multi-stage countercurrent with water to wash, wash water temperature is 60~90 DEG C, dealkalize slag after washing
For producing calcium silicate insulation or calcium silicate board.
A kind of 2. dealkalization method of coal ash lifting aluminium slag according to claim 1, it is characterised in that：The step
It is rapid 1) in coal ash lifting aluminium slag be wet method from flyash extract aluminum oxide after gained using silicic acid hydrogen sodium calcium as main component
Alkaline residue.
A kind of 3. dealkalization method of coal ash lifting aluminium slag according to claim 1, it is characterised in that：The step
It is rapid 2) in stir speed (S.S.) be 10~500r/min.
A kind of 4. dealkalization method of coal ash lifting aluminium slag according to claim 1, it is characterised in that：The step
The pressure of rapid 2) middle reaction is 0~2.3MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113247914A (en) * | 2021-04-12 | 2021-08-13 | 南昌大学 | Method for preparing goethite by using fly ash aluminum extraction slag and application |
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| GB889763A (en) * | 1958-06-09 | 1962-02-21 | Sidney Dilnot | Strong calcium silicate hydrate product and process of making same |
| CN102432035A (en) * | 2011-08-31 | 2012-05-02 | 昊青薪材（北京）技术有限公司 | Sodium calcium aluminosilcate slag alkali recovery process |
| CN103708479A (en) * | 2013-12-30 | 2014-04-09 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Method for simultaneously preparing sodium metaaluminate and activated calcium metasilicate from coal ash |
| CN105293542A (en) * | 2014-06-06 | 2016-02-03 | 神华集团有限责任公司 | Pre-desilication method, leaching method, dealkalization method and separation method for coal fly ash, and method for extracting aluminum from coal fly ash |
| CN105565352A (en) * | 2016-02-06 | 2016-05-11 | 杭州锦江集团有限公司 | Method for producing aluminium oxide with high-alumina fly ash |
| CN105565350A (en) * | 2016-02-06 | 2016-05-11 | 杭州锦江集团有限公司 | Method for producing aluminum oxide with high-alumina fly ash |
-
2016
- 2016-05-24 CN CN201610350145.3A patent/CN107416874B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB889763A (en) * | 1958-06-09 | 1962-02-21 | Sidney Dilnot | Strong calcium silicate hydrate product and process of making same |
| CN102432035A (en) * | 2011-08-31 | 2012-05-02 | 昊青薪材（北京）技术有限公司 | Sodium calcium aluminosilcate slag alkali recovery process |
| CN103708479A (en) * | 2013-12-30 | 2014-04-09 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Method for simultaneously preparing sodium metaaluminate and activated calcium metasilicate from coal ash |
| CN105293542A (en) * | 2014-06-06 | 2016-02-03 | 神华集团有限责任公司 | Pre-desilication method, leaching method, dealkalization method and separation method for coal fly ash, and method for extracting aluminum from coal fly ash |
| CN105565352A (en) * | 2016-02-06 | 2016-05-11 | 杭州锦江集团有限公司 | Method for producing aluminium oxide with high-alumina fly ash |
| CN105565350A (en) * | 2016-02-06 | 2016-05-11 | 杭州锦江集团有限公司 | Method for producing aluminum oxide with high-alumina fly ash |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113247914A (en) * | 2021-04-12 | 2021-08-13 | 南昌大学 | Method for preparing goethite by using fly ash aluminum extraction slag and application |
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