CN102173441A - Cogeneration method for high-aluminium coal pyroelectricity and aluminum oxide - Google Patents
Cogeneration method for high-aluminium coal pyroelectricity and aluminum oxide Download PDFInfo
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Abstract
The invention relates to a cogeneration method for high-aluminium coal pyroelectricity and aluminum oxide. The method comprises the steps of: mixing and grinding a calcium material, a sodium material and an active excitant to prepare additive powder; crushing the high-aluminium coal and mixing with the additive powder, and then continuously sending to a recirculating fluidized bed boiler for combustion to generate flue fly ash and bottom slag beside the heat and electricity; immersing the fly ash and bottom slag to water to obtain sodium metaaluminate and Ca2SiO4; and carrying out seed precipitation or carbonation to obtain aluminium hydroxide, and then calcining the aluminium hydroxide to obtain the alumina. Compared with the prior art, the calcination and activation process of the coal ash is combined with the combustion of the coal-fired boiler, thus the secondary calcining of the coal ash is saved, the process flow is shortened, the production cost is reduced and the pollution is reduced. Only taking the Jungar coal field as the example, if the cogeneration method is adopted, more than 50 hundred millions of tons of Al2O3 can be obtained while the heat and electricity are obtained, therefore, the strategic situation of aluminium ore resource shortage in China can be basically changed, at the same time, the land occupation, environment pollution and series of resource and environmental problems caused by coal ash stacking of the thermal power plant can be solved.
Description
Technical field:
The present invention relates to a kind of method of alumina of obtaining from fossil oil, especially high alumina coal burns in the circulating fluidized bed heat-power boiler and produces production method of alumina in heat and the electricity.
Background technology:
Coal is the resource of reserves maximum in the primary energy source in the world.China is that the world's five big poly-coals are concentrated one of area, and the abundant in coal resource is arranged.Totally proven reserve reached 7,400 hundred million tons to 1987, occupied the third place in the world.Particularly China has strengthened prospecting dynamics to natural resources over past ten years, and constantly there is new coalfield resource discovering in each big coalfield, nationwide, has further increased the reserves of coal resources.China is rich coal resources not only, also is the big country that utilizes coal to carry out thermal power generation simultaneously, and present generated energy is still based on thermal power generation.According to statistics, the generated energy of first quarter thermoelectricity in 2008 has accounted for 88.55% of whole generated energy.
Except containing combustiblecomponents, also contain multiple inorganics in the coal.These inorganicss form flyash after coal combustion, the ash content of coal average out to about 30% of coal.A large amount of soils are are not only occupied in the discharging of flyash, and serious environment pollution, have constituted the dual destruction to ecological and environment.Studies show that the crystal mineral that mainly contain in the flyash have quartz, mullite, rhombohedral iron ore, magnetite, feldspar etc., contain a large amount of amorphous substances in addition.From chemical constitution, be mainly silicon oxide, aluminum oxide, contain chemical ingredientss such as a spot of iron, calcium, sodium, magnesium in addition.This flyash is called as aluminous fly-ash when alumina content in the flyash surpasses 35%, and corresponding coal can be called as the high alumina coal.China's high alumina coal mainly is distributed in the coal accumulating area, North China.Wherein the alumina content in the coal produced of North of North China is higher, behind the coal combustion in the ash content alumina content majority all greater than 40%, that have even higher, as alumina content in the ash content of coal of accurate Ge Er coalfield, the Inner Mongol up to 65%; Alumina content in the coal of central plain area is also higher, and major part has all surpassed 30%.
People have explored the multiple approach that the high alumina coal is fully utilized at present, are mostly that with the flyash after burning be research object.At present, the method for extracting aluminum oxide, silicon oxide from flyash is broadly divided into acid system and alkaline process two big classes.
Acid system is direct and acid solution reaction with flyash, obtains aluminum salt solution, then aluminium salt calcining and decomposing is prepared aluminum oxide, contains more iron contamination in the aluminum oxide with the direct preparation of this method, needs the molten deironing of further alkali usually.But the molten method of this molten back alkali of acid earlier makes complex manufacturingization, has also increased production cost.Recently, CN201010161879 discloses the method deironing that " a kind of method of utilizing fluid-bed fly ash to be equipped with metallurgical-grade aluminum oxide " adopts magnetic separation and resin absorption to combine, compare with the technology of alkaline process deironing in the past, this method operation steps is simple, good iron removal effect.But the deficiency of this acid technological process is that the corrodibility of acid is stronger, to having relatively high expectations of equipment.Other adopts the patent of acid system to have: CN1923695A, CN1920067A, CN101045543A, CN101397146A, CN1792802A, CN1927716A.
Alkaline process comprises limestone sintering method, soda-lime sintering process, alkali burning method or the like.In these methods, the limestone sintering method is present unique a kind of method that is committed to commerical test, and reasons such as other method is low owing to restriction, the alumina extraction ratio of processing condition, production cost height still rest on the laboratory test stage at present.What CN1548374A, CN1644506A disclosed the employing of Inner Mongol Meng Xi new and high technology group is exactly that the limestone sintering method is extracted aluminum oxide, and its main processes is: with aluminous fly-ash and limestone calcination, extract aluminum oxide with alkali solution technique then; In conjunction with the low temperature stripping process by Bayer process, finally obtain aluminum oxide on the basis that the abundant carbon of thick liquid oxidation aluminium divides, the silico-calcium slag of generation can be used as the material that adds of producing cement.This project just stays cool behind the project kickoff soon because a difficult problem of producing on some Technologies such as the quantity of slag is big, calcining temperature is high, the rate of recovery of alkali is low is difficult to effectively be solved always always.Other adopts the patent of alkaline process to have: CN101070173A, CN101306826A, CN101049935A, CN10284668A, CN101302021A, CN101125656A, CN101041449A, CN1030217A, CN101028936A, CN101085679A, CN1539735A.
In the process of above-mentioned employing limestone sintering method useful components such as aluminum oxide, silicon oxide in extracting flyash, need be with the flyash high-temperature calcination, wherein useful component activation is extracted then.Coal or other fossil oils are in 1300 ℃ of-1700 ℃ of high-temp combustion processes, compositions such as the aluminum oxide in coal or the coal ash, silicon oxide exist mutually with the higher thing of activity, in case lime-ash cooling cooling, activeconstituents wherein is converted into the thing phase that stability is higher, reactive behavior is lower, even carry out secondary clacining, also be difficult to it is fully activated, limited the extraction of useful component.
Recently, people have studied and directly added additive in coals, make it come the method for modified coal ash with coal combustion in boiler.CN1160690A discloses a kind of " dual-purpose method, product facility and the application that goes out heat simultaneously and produce cement clinker of a stove ", be in coal dust, to add the co-combustion agent that is rich in calcium oxide, make it that mineralising reaction take place between grey matter when coal-powder boiler burns, obtain quick-baking cement clinker.CN1356282A discloses a kind of " clean combustion of boiler using coal as fuel and comprehensive utilization ", be in coal, to add the co-combustion agent that serves many purposes, form " affine particle " with the coal grinding, send into and carry out " affine calcining " in the stove, product can be produced active fly ash, self-hardening property flyash, belite cement grog etc.CN1382657A discloses a kind of " aluminate cement/active fly ash method and product produced in the coal firing boiler heat supply simultaneously ", be in fire coal, to add calcareous and aluminum raw material, this calcareous and aluminum raw material chemical combination in burning, thus aluminate cement or active fly ash product obtained.
Though above several method obtains modified coal ash by add additive in coal, and the silicon oxide component in the ash fully utilized, but have two defectives: (1) does not carry out independent extraction and application to having more the alumina component of high added value in coal and the coal ash.(2) because temperature required higher in the preparation cement clinker process, usually need the high temperature more than 1300 ℃, above method can only be applied in the coal-powder boiler, and there are following two deficiencies in coal-powder boiler: (1) coal-powder boiler is had relatively high expectations to ature of coal, and the additive that adds causes combustion instability, the calorific value of coal dust to descend even is difficult to burning; (2) in coal-powder boiler, coal dust or its grey matter are very short in the residence time of burner hearth high-temperature zone, average is about 2-6 second, additive in the so short time, be difficult to coal and coal ash in chemical ingredients fully react, therefore be difficult to obtain abundant activatory flyash.
Summary of the invention:
Purpose of the present invention just is at above-mentioned the deficiencies in the prior art, and the co-production of a kind of high alumina coal thermoelectricity and aluminum oxide is provided.
The objective of the invention is to be achieved through the following technical solutions:
The co-production of high alumina coal thermoelectricity and aluminum oxide comprises following order and step:
A, with calcareous raw material, sodium raw material and activity excitant mixes and grinding to the 20-120 order, make the additive powder;
B, the high alumina coal is crushed to below the 20mm, mixes, send into burning in circulating fluid bed boiler continuously, produce heat, obtain fume duct fly ash and end slag electric the time with the additive powder;
C, be milled to end ground-slag behind 200 orders and flying dust is sent in the water logging groove, add water-solublely to go out, fully stir back water logging 10-60 minute by the mass ratio of water ash 2-3/1;
D, through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and water logging slag, the water logging slag is β type Ca
2SiO
4
E, sodium aluminate solution are got aluminium hydroxide through kind of branch or carbon, and the yellow soda ash after sodium hydroxide after kind is divided or carbon divide recycles as the sodium raw material;
F, aluminium hydroxide got alumina product in 1-2 hour through 1100 ℃-1200 ℃ calcinings.
The described calcareous raw material of step a is to be rich in the raw material that calcium oxide maybe can be converted into calcium oxide, include but not limited to carbide slag, unslaked lime, white lime, Wingdale, described sodium raw material is to be rich in the raw material that sodium oxide maybe can be converted into sodium oxide, include but not limited to yellow soda ash, sodium bicarbonate, sodium hydroxide, described exciting agent is NaF, AlF
3, CaF
2In choose one or more.
Described calcareous raw material and sodium raw material are according to SiO in the high alumina ash content of coal
2And Al
2O
3Content carry out proportioning and add, calcareous raw material is pressed in the raw material SiO among the CaO and ash content
2Mass ratio be CaO: SiO
2=1: 0.3-1.0, the sodium raw material is pressed Na in the raw material
2Al in O and the ash content
2O
3Mass ratio be Na
2O: Al
2O
3=1: 0.5-2.5.
The consumption of exciting agent is the 1%-3% of high alumina ash content of coal.
The temperature of combustion of described circular fluid bed is 750 ℃-1050 ℃.
Sodium aluminate solution kind branch condition described in the step e is: decomposes 60 ℃-75 ℃ of initial temperature, decomposes warm 36 ℃-42 ℃ eventually, and resolving time 48-60 hour, crystal seed coefficient 2; The carbon branch condition of described sodium aluminate solution is: 10 ℃-60 ℃ of temperature of reaction, carbon divides terminal point pH value of solution value 10.5-13.
Beneficial effect: the present invention compared with prior art, coproduction aluminum oxide when the high alumina coal combustion obtains heat and electricity, the calcining and activating process of flyash and the burning of coal firing boiler are combined, aluminous fly-ash reactivation process is to produce in the process of heat and electricity at burning in circulating fluid bed boiler, saved the secondary clacining process of flyash, shorten technical process, reduced production cost, reduced pollution.Be example only with accurate Ge Er coalfield, proven reserve reach more than 300 hundred million tons, the ash content average content about 30% in the coal, aluminum oxide average content 50% in the ash content, calculate with this, if adopt technical scheme of the present invention, can when obtaining heat and electricity, obtain more than 50 hundred million tons of aluminium sesquioxides, this fundamentally changes the strategic general layout of China's bauxite resource shortage.Can solve simultaneously heat power plant and stack a series of resource environment problems such as the land seizure that brought, contaminate environment because of flyash.
Description of drawings:
Accompanying drawing is the co-production schema of high alumina coal thermoelectricity and aluminum oxide.
Embodiment:
Be described in further detail below in conjunction with drawings and Examples:
The co-production of high alumina coal thermoelectricity and aluminum oxide comprises following order and step:
A, with calcareous raw material (for being rich in the raw material that calcium oxide maybe can be converted into calcium oxide, include but not limited to carbide slag, unslaked lime, white lime, Wingdale), sodium raw material (, including but not limited to yellow soda ash, sodium bicarbonate, sodium hydroxide) and activity excitant NaF, AlF for to be rich in the raw material that sodium oxide maybe can be converted into sodium oxide
3, CaF
2In choose one or more and mix and grinding to 20-120 order is made the additive powder;
Calcareous raw material and sodium raw material are according to SiO in the high alumina ash content of coal
2And Al
2O
3Content carry out proportioning and add, calcareous raw material is pressed in the raw material SiO among the CaO and ash content
2Mass ratio be CaO: SiO
2=1: 0.3-1.0, the sodium raw material is pressed Na in the raw material
2Al in O and the ash content
2O
3Mass ratio be Na
2O: Al
2O
3=1: 0.5-2.5.The consumption of exciting agent is the 1%-3% of high alumina ash content of coal.
B, the high alumina coal is crushed to below the 20mm, mixes, send into burning in circulating fluid bed boiler continuously, produce heat, obtain fume duct fly ash and end slag electric the time with the additive powder;
C, be milled to end ground-slag behind 200 orders and flying dust is sent in the water logging groove, by water ash 2-3: 1 mass ratio adds water-solublely to go out, and fully stirs back water logging 10-60 minute;
D, through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and water logging slag, the water logging slag is β type Ca
2SiO
4
E, sodium aluminate solution are got aluminium hydroxide through kind of branch or carbon, and the yellow soda ash after sodium hydroxide after kind is divided or carbon divide recycles as the sodium raw material;
F, aluminium hydroxide got alumina product in 1-2 hour through 1100 ℃-1200 ℃ calcinings.
The temperature of combustion of described circular fluid bed is 750 ℃-1050 ℃.
Sodium aluminate solution kind branch condition described in the step e is: decomposes 60 ℃-75 ℃ of initial temperature, decomposes warm 36 ℃-42 ℃ eventually, and resolving time 48-60 hour, crystal seed coefficient 2; The carbon branch condition of described sodium aluminate solution is: 10 ℃-60 ℃ of temperature of reaction, carbon divides terminal point pH value of solution value 10.5-13.
Embodiment 1
Get 10 tons in accurate Ge Er coalfield raw coal, this coal ash 20wt%, Al in the ash content
2O
3Content is 60wt%, SiO
2Content is 32wt%.2.29 tons of Wingdales and 1.64 tons of yellow soda ash and 0.04 ton of NaF combined grinding to 100 order are made the additive powder.The additive powder is mixed with raw coal below being crushed to 20mm, send into 850 ℃ of burnings in the circular fluid bed continuously, produce heat and, obtain 2.9 tons of flying dusts in the flue, 1.36 tons of boiler bottom slags, the boiler bottom ground-slag is milled to 200 orders and flying dust is together sent in the water logging groove, adds 8.52 tons of water and carry out the water logging stripping, fully stirred water logging 20 minutes; Through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and β type Ca
2SiO
4Add aluminium hydroxide crystal seed and carry out kind of a branch in sodium aluminate solution, plant timesharing and decompose 70 ℃ of initial temperature, decomposing eventually, 40 ℃ of temperature, 55 hours resolving times, crystal seed coefficient are 2.Slurries after kind is divided obtain aluminum hydroxide filter cake through plate basket pressure filter solid-liquid separation, send into High Temperature Furnaces Heating Apparatus in 150 ℃ of dryings after 0.5 hour, in 1200 ℃ of calcinings 2 hours, obtain 1.14 tons of alumina products.After measured, alumina extraction ratio is 95%.The sulfur dioxide in flue gas quantity discharged reduces by 95%.
Embodiment 2
Get 10 tons in certain coalfield raw coal, this coal ash 30wt%, Al in the ash content
2O
3Content is 48wt%, SiO
2Content is 40wt%.This coal is crushed to below the 20mm, with 2.96 tons of carbide slags and 1.5 tons of yellow soda ash and 0.06 ton of AlF
3Combined grinding to 100 order is made the additive powder.The additive powder is mixed with broken coal, sends in the circular fluid bed continuously and burn, produce heat and, obtain 4.32 tons of flying dusts in the flue, 1.8 tons of boiler bottom slags, grinding to 200 order and flying dust are together sent in the water logging groove, add 13.46 tons of water logging strippings of water, fully stir back water logging 40 minutes; Through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and β type Ca
2SiO
4Feed carbonic acid gas in sodium aluminate solution, carry out the carbon branch, carbon branch temperature of reaction is 40 ℃, stops to feed carbonic acid gas when the pH value of solution value reaches 10.5.Slurries after carbon divides obtain aluminum hydroxide filter cake through plate basket pressure filter solid-liquid separation, send into High Temperature Furnaces Heating Apparatus in 150 ℃ of dryings after 0.5 hour, in 1150 ℃ of calcinings 2 hours, obtain 1.36 tons of alumina products.After measured, alumina extraction ratio is 94.4%.The sulfur dioxide in flue gas quantity discharged reduces by 96%.
Embodiment 3
Get 10 tons in certain coalfield raw coal, this coal ash 25wt%, Al in the ash content
2O
3Content is 55wt%, SiO
2Content is 38wt%.With 2.46 tons of white limes and 1.19 tons of sodium hydroxide and 0.06 ton of CaF
2Combined grinding to 100 order is made the additive powder.The additive powder is mixed with raw coal below being crushed to 20mm, send in the circular fluid bed continuously and burn, produce heat and, obtain 3.70 tons of flying dusts in the flue, 1.58 tons of boiler bottom slags, grinding to 200 order is together sent in the water logging groove with flying dust, add 10.56 tons of water logging strippings of water, fully stir back water logging 60 minutes; Through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and β type Ca
2SiO
4Feed carbonic acid gas in sodium aluminate solution, carry out the carbon branch, carbon branch temperature of reaction is 40 ℃, stops to feed carbonic acid gas when the pH value of solution value reaches 10.5.Slurries after carbon divides obtain aluminum hydroxide filter cake through plate basket pressure filter solid-liquid separation, send into High Temperature Furnaces Heating Apparatus in 150 ℃ of dryings after 0.5 hour, in 1100 ℃ of calcinings 1.5 hours, obtain 1.32 tons of alumina products.Calculate after measured, alumina extraction ratio is 96.2% in the breeze.The sulfur dioxide in flue gas quantity discharged reduces by 94%.
Embodiment 4
Get 10 tons in certain coalfield raw coal, this coal ash 30wt%, Al in the ash content
2O
3Content is 48wt%, SiO
2Content is 40wt%.This coal is crushed to below the 20mm, with 2.4 tons of Wingdales and 1.79 tons of yellow soda ash and 0.03 ton of AlF
3, 0.01 ton of CaF
2Combined grinding to 100 order is made the additive powder.The additive powder is mixed with broken coal, sends in the circular fluid bed continuously and burn, produce heat and, obtain 3.50 tons of flying dusts in the flue, 1.89 tons of boiler bottom slags, grinding to 200 order and flying dust are together sent in the water logging groove, add 13.48 tons of water logging strippings of water, fully stir back water logging 40 minutes; Through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and β type Ca
2SiO
4Feed carbonic acid gas in sodium aluminate solution, carry out the carbon branch, carbon branch temperature of reaction is 40 ℃, stops to feed carbonic acid gas when the pH value of solution value reaches 10.5.Slurries after carbon divides obtain aluminum hydroxide filter cake through plate basket pressure filter solid-liquid separation, send into High Temperature Furnaces Heating Apparatus in 150 ℃ of dryings after 0.5 hour, in 1150 ℃ of calcinings 2 hours, obtain 1.37 tons of alumina products.After measured, alumina extraction ratio is 95.2%.The sulfur dioxide in flue gas quantity discharged reduces by 92%.
Embodiment 5
Get 10 tons in certain coalfield raw coal, this coal ash 25wt%, Al in the ash content
2O
3Content is 55wt%, SiO
2Content is 38wt%.With 1.86 tons of unslaked limes and 1.08 tons of sodium hydroxide and 0.02 ton of NaF, 0.01 ton of AlF
3Combined grinding to 100 order is made the additive powder.The additive powder is mixed with raw coal below being crushed to 20mm, send in the circular fluid bed continuously and burn, produce heat and, obtain 3.50 tons of flying dusts in the flue, 1.70 tons of boiler bottom slags, grinding to 200 order is together sent in the water logging groove with flying dust, add 11.44 tons of water logging strippings of water, fully stir back water logging 60 minutes; Through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and β type Ca
2SiO
4Feed carbonic acid gas in sodium aluminate solution, carry out the carbon branch, carbon branch temperature of reaction is 40 ℃, stops to feed carbonic acid gas when the pH value of solution value reaches 10.5.Slurries after carbon divides obtain aluminum hydroxide filter cake through plate basket pressure filter solid-liquid separation, send into High Temperature Furnaces Heating Apparatus in 150 ℃ of dryings after 0.5 hour, in 1100 ℃ of calcinings 1.5 hours, obtain 1.33 tons of alumina products.Calculate after measured, alumina extraction ratio is 97.0% in the breeze.The sulfur dioxide in flue gas quantity discharged reduces by 96%.
Embodiment 6
Get 10 tons in accurate Ge Er coalfield raw coal, this coal ash 20wt%, Al in the ash content
2O
3Content is 60wt%, SiO
2Content is 32wt%.1.2 tons of unslaked limes and 0.94 ton of sodium hydroxide and 0.04 ton of NaF combined grinding to 100 order are made the additive powder.The additive powder is mixed with raw coal below being crushed to 20mm, send into 850 ℃ of burnings in the circular fluid bed continuously, produce heat and, obtain 2.9 tons of flying dusts in the flue, 1.03 tons of boiler bottom slags, the boiler bottom ground-slag is milled to 200 orders and flying dust is together sent in the water logging groove, adds 8.65 tons of water and carry out the water logging stripping, fully stirred water logging 20 minutes; Through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and β type Ca
2SiO
4Add aluminium hydroxide crystal seed and carry out kind of a branch in sodium aluminate solution, plant timesharing and decompose 70 ℃ of initial temperature, decomposing eventually, 40 ℃ of temperature, 55 hours resolving times, crystal seed coefficient are 2.Slurries after kind is divided obtain aluminum hydroxide filter cake through plate basket pressure filter solid-liquid separation, send into High Temperature Furnaces Heating Apparatus in 150 ℃ of dryings after 0.5 hour, in 1200 ℃ of calcinings 2 hours, obtain 1.12 tons of alumina products.After measured, alumina extraction ratio is 93%.The sulfur dioxide in flue gas quantity discharged reduces by 94%.
Claims (6)
1. the co-production of high alumina coal thermoelectricity and aluminum oxide is characterized in that, comprises following order and step:
A, with calcareous raw material, sodium raw material and activity excitant mixes and grinding to the 20-120 order, make the additive powder;
B, the high alumina coal is crushed to below the 20mm, mixes, send into burning in circulating fluid bed boiler continuously, produce heat, obtain fume duct fly ash and end slag electric the time with the additive powder;
C, be milled to end ground-slag behind 200 orders and flying dust is sent in the water logging groove, by water ash 2-3: 1 mass ratio adds water-solublely to go out, and fully stirs back water logging 10-60 minute;
D, through plate basket pressure filter solid-liquid separation, obtain sodium aluminate solution and water logging slag, the water logging slag is β type Ca
2SiO
4
E, sodium aluminate solution are got aluminium hydroxide through kind of branch or carbon, and the yellow soda ash after sodium hydroxide after kind is divided or carbon divide recycles as the sodium raw material;
F, aluminium hydroxide got alumina product in 1-2 hour through 1100 ℃-1200 ℃ calcinings.
2. according to the co-production of claim 1 described high alumina coal thermoelectricity and aluminum oxide, it is characterized in that, the described calcareous raw material of step a is to be rich in the raw material that calcium oxide maybe can be converted into calcium oxide, include but not limited to carbide slag, unslaked lime, white lime, Wingdale, described sodium raw material is to be rich in the raw material that sodium oxide maybe can be converted into sodium oxide, include but not limited to yellow soda ash, sodium bicarbonate, sodium hydroxide, described exciting agent is NaF, AlF
3, CaF
2In choose one or more.
3. according to the co-production of claim 1,2 described high alumina coal thermoelectricity and aluminum oxide, it is characterized in that described calcareous raw material and sodium raw material are according to SiO in the high alumina ash content of coal
2And Al
2O
3Content carry out proportioning and add, calcareous raw material is pressed in the raw material SiO among the CaO and ash content
2Mass ratio be CaO: SiO
2=1: 0.3-1.0, the sodium raw material is pressed Na in the raw material
2Al in O and the ash content
2O
3Mass ratio be Na
2O: Al
2O
3=1: 0.5-2.5.
4. according to the co-production of claim 1 described high alumina coal thermoelectricity and aluminum oxide, it is characterized in that the consumption of exciting agent is the 1%-3% of high alumina ash content of coal.
5. according to the co-production of claim 1 described high alumina coal thermoelectricity and aluminum oxide, it is characterized in that the temperature of combustion of described circular fluid bed is 750 ℃-1050 ℃.
6. according to the co-production of claim 1 described high alumina coal thermoelectricity and aluminum oxide, it is characterized in that the sodium aluminate solution kind branch condition described in the step e is: decompose 60 ℃-75 ℃ of initial temperature, decompose warm 36 ℃-42 ℃ eventually, resolving time 48-60 hour, crystal seed coefficient 2; The carbon branch condition of described sodium aluminate solution is: 10 ℃-60 ℃ of temperature of reaction, carbon divides terminal point pH value of solution value 10.5-13.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032393A (en) * | 2021-10-29 | 2022-02-11 | 神华准格尔能源有限责任公司 | Reaction system for preparing aluminum silicon powder from high-aluminum coal |
| CN114032392A (en) * | 2021-10-29 | 2022-02-11 | 神华准格尔能源有限责任公司 | Method for preparing aluminum silicon powder from high-aluminum coal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100491254C (en) * | 2007-02-26 | 2009-05-27 | 长安大学 | Method for extracting aluminium oxide and combined production for cement from coal ash thermal boiler |
-
2011
- 2011-02-25 CN CN 201110044976 patent/CN102173441A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100491254C (en) * | 2007-02-26 | 2009-05-27 | 长安大学 | Method for extracting aluminium oxide and combined production for cement from coal ash thermal boiler |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032393A (en) * | 2021-10-29 | 2022-02-11 | 神华准格尔能源有限责任公司 | Reaction system for preparing aluminum silicon powder from high-aluminum coal |
| CN114032392A (en) * | 2021-10-29 | 2022-02-11 | 神华准格尔能源有限责任公司 | Method for preparing aluminum silicon powder from high-aluminum coal |
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Application publication date: 20110907 |