CN101182025A - Method for preparing chemical aluminum oxide by using andalusite as raw material - Google Patents
Method for preparing chemical aluminum oxide by using andalusite as raw material Download PDFInfo
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- CN101182025A CN101182025A CNA2007101782241A CN200710178224A CN101182025A CN 101182025 A CN101182025 A CN 101182025A CN A2007101782241 A CNA2007101782241 A CN A2007101782241A CN 200710178224 A CN200710178224 A CN 200710178224A CN 101182025 A CN101182025 A CN 101182025A
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- andaluzite
- aluminum oxide
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Abstract
The invention discloses a preparation method of alumina chemicals by using andalusite as raw materials. Gangue obtained from ore dressing of the andalusite ore is adopted as raw materials and treated with ball making, baking, multi-stage separation, additive adding and granulation to extract the alumina chemicals with the purity of 99.5 to 99.999 percent, which leads andalusite resource to be comprehensively utilized with resource conservation as well as environmental protection.
Description
Technical field
The present invention relates to a kind of extracting method, more particularly say, be meant that a kind of is the method that raw material production goes out chemical aluminum oxide with mine tailing after the andaluzite ore dressing.
Background technology
Chemical aluminum oxide is the metallurgical serial aluminum oxide of right and wrong, mainly comprise special cermacis aluminum oxide series, activated alumina series, granulation powder series, special refractories aluminum oxide series, grinding and polishing aluminum oxide series etc., be widely used in chemical industry, pottery, refractory materials and military industry etc., consumption is very big, and market outlook are wide.
World production chemical aluminum oxide raw material is a bauxite at present.Yet, the andaluzite ore is selected the raw material of andaluzite concentrate as refractory materials by ore dressing, the aluminum oxide grade need be greater than 57%, productive rate has only 12～15%, and the salic less than 57% of mine tailing after a large amount of ore dressings can't be utilized, store up in the mine, not only wasted resource, even more serious is contaminate environment, causes public hazards.
Andaluzite is a kind of rich aluminium mineral, belongs to kyanite class mineral, is natural high aluminium silicate mineral, and chemical constitution is Al
2O
3SiO
2, molecular formula is Al
2(SiO
4) O, rhombic system, column crystalline form, density 3.10～3.20 grams per cubic centimters.If can utilize andalusite mine to produce the chemical aluminum oxide technical feasibility, can be the raw material production chemical aluminum oxide just with the mine tailing after the andalusite mine ore dressing, make the andaluzite resource obtain comprehensive utilization, both saved resource, protected environment again.Yet, do not see as yet in the existing documents and materials that relevant report produces the chemical method of alumina with andaluzite.
Summary of the invention
The objective of the invention is to propose a kind of is the method that raw material production goes out chemical aluminum oxide with the mine tailing after the andaluzite ore dressing, has solved a large amount of unserviceable problems of mine tailing after the andaluzite ore dressing.
The present invention be a kind of be the method for feedstock production chemical aluminum oxide with the andaluzite, the preparation of chemical aluminum oxide is that to extract purity the raw material be 99.5～99.999% chemical aluminum oxide through the mine tailing of mode after the andalusite mine ore dressing of system ball, roasting, stage trapping, interpolation auxiliary agent, granulation.
The technology for preparing chemical aluminum oxide with bauxite is compared, and the present invention's andaluzite is that feedstock production chemical aluminum oxide method has following characteristics:
(1) be that raw material can be prepared the chemical aluminum oxide that meets standard GB/YT619-2007 with the mine tailing after andalusite mine or the andaluzite ore dressing, save the bauxite resource of China's scarcity, solve a large amount of unserviceable problems of mine tailing after the ore dressing of andaluzite mine simultaneously, produced the high chemical aluminum oxide of added value.
(2) utilize the new calcium mixture as the agent of andalusite mine calcination activation, can realize low-temperature bake, energy-saving and cost-reducing, reduce cost.
(3) use of impurity and purification agent can realize that desiliconization and removal of impurities comprise removing of silicon, iron, calcium, magnesium, titanium, vanadium etc. a step, and technology is simplified greatly, and effective.
(4) hydro-thermal synthetic handle to cooperate with sodium removing agent obtain hanging down the sodium high purity aluminium hydroxide, technology is simple, cost is low.
(5) the spraying thermal treatment process obtains the high purity alumina powder of different indexs.
(6) slag can be used as the raw material of preparation cement or other lagging material, no industrial waste.
Description of drawings
Fig. 1 is the present invention prepares chemical aluminum oxide with the andaluzite mine tailing a FB(flow block).
Embodiment
Of the present invention a kind of be the method for raw material production chemical aluminum oxide with andaluzite, it has following preparation steps:
The first step: pulverize andalusite mine system ball
With granularity less than the andalusite mine of 40～50 weight parts of 0.5mm and granularity less than the activator mix of 50～60 weight parts of 0.5mm evenly after, make the pelletizing that granularity is 10～60mm through apparatus for making pearl ball;
The Calcium Fluoride (Fluorspan) CaF that adds 1～5 weight part among the calcium oxide CaO of described activator by 100 weight parts
2Form;
Second step: roasting system andaluzite is from pulverizing material
The pelletizing that the first step is made makes roasting material at 1100～1300 ℃ of following roasting 40～90min of temperature;
Roasting material shifts out stoving oven with crucible then, when the roasting material temperature in the crucible is reduced to 300～400 ℃, takes out roasting material and places air to naturally cool to 18～27 ℃, makes andaluzite from pulverizing material; This andaluzite is 10～50 μ m from the granularity of pulverizing material, the reaching more than 98% from degradation rate of roasting material;
The 3rd step: the system andaluzite leaches ore pulp
The andaluzite that second step is made is 6～8% yellow soda ash Na from pulverizing material and concentration
2CO
3Solution is mixed and made into ore pulp in agitator, heating ore pulp to 60～85 ℃, and mechanical stirring 50～80min makes andaluzite and leaches ore pulp;
The andaluzite of 100g is from pulverizing the sodium carbonate solution that 200～400L is arranged in the material in this ore pulp;
Mechanical stirring speed is 700～1000r/min;
The 4th step: impurity and purification are handled
The andaluzite leaching ore pulp that the 3rd step made is removed slag through the A filtering net, make thick leach liquor; In the thick leach liquor of 100L, add 2～8kg impurity and purification agent, stir, after the B filtering net is removed impurity, make sodium aluminate solution;
Described slag is Dicalcium Phosphate (Feed Grade) (making the main raw material of cement), the silicon-dioxide SiO below 7% more than 90%
2, the aluminium oxide Al below 2%
2O
3, and oxide compound iron, the magnesium oxide of surplus.
Described impurity and purification agent is made up of the calcium oxide CaO of 10 weight parts and the aluminium glue of 3～5 weight parts, or by the calcium oxide CaO of 10 weight parts and the aluminium hydroxide Al (OH) of 3～5 weight parts
3Form;
Described impurity includes silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V etc.
Contain impurity such as silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V in the general andaluzite raw ore, in the present invention, though the andaluzite raw ore is same these elements that exist in the thick leach liquor that system ball, roasting, leaching, separation obtain, chemical reaction is carried out in this element and impurity and purification agent, generate precipitated calcium silicate, other impurity then by aluminium glue or aluminium hydroxide adsorption precipitation in the A separator.
The 5th step: carbon decomposes
Add the aluminium hydroxide crystal seed of 15～25g in the sodium aluminate solution with the 4th 1L that obtain of step, and to feed concentration be 20～36% carbon dioxide, under 40～60 ℃ of conditions, carry out carbon branch disaggregating treatment, make aluminium hydroxide;
The sodium aluminate solution that contains aluminium hydroxide crystal seed stops to feed carbon dioxide in pH=8～9 o'clock;
The 6th step: hydro-thermal is synthetic to be handled
In the 5th aluminium hydroxide that makes of step, add sodium removing agent and carry out that hydro-thermal is synthetic to be handled, obtain the high purity aluminium hydroxide Al (OH) of purity 99.5～99.999%
3
Described hydro-thermal synthesis temperature is 110～150 ℃, and pressure is 1～10MPa, and the synthetic treatment time of hydro-thermal is controlled to be 30～120min;
Described sodium removing agent is volatile salt (NH4)
2CO
3, bicarbonate of ammonia NH
4HCO
3One or both the combination, during combination by weight 1: 1 the preparation sodium removing agent.
The consumption of described sodium removing agent is to add 0.3～5 weight part sodium removing agent in the neutral hydrogen aluminum oxide of 100 weight parts;
In the aluminium hydroxide that this step obtains, contain 1～2% sodium, this sodium is present in the intermolecular of aluminium hydroxide, adopts ordinary method to remove, and handles by hydration heat, sodium and sodium removing agent generation chemical reaction generate yellow soda ash, and this yellow soda ash is dissolved in the synthetic treatment solution of hydro-thermal.
The 7th step: powder is made in atomizing
Go on foot the high purity aluminium hydroxide Al (OH) that obtains with the 6th
3The thermal treatment of spraying obtains the aluminium oxide Al that granularity is 1～30 μ m
2O
3Powder, aluminium oxide Al
2O
3Powder whiteness is more than 97.
Described spraying thermal treatment process condition is: temperature is 900～1200 ℃, and pressure is 1～10MPa.
Embodiment 1:
The aluminum oxide grade that comprises in the andaluzite mine tailing is 45wt%, silicon oxide-containing 46wt%, and ferric oxide 2wt%, surplus is other impurity.
The first step: pulverize andaluzite mine tailing system ball
With granularity less than the andalusite mine of 45 weight parts of 0.5mm and granularity less than the activator mix of 55 weight parts of 0.5mm evenly after, make the pelletizing that granularity is 10mm through apparatus for making pearl ball;
Described activator is by the Calcium Fluoride (Fluorspan) CaF that adds 5 weight parts among the calcium oxide CaO of 100 weight parts
2Form;
Second step: roasting system andaluzite is from pulverizing material
The pelletizing that the first step is made makes roasting material at 1300 ℃ of following roasting 60min of temperature;
Roasting material shifts out stoving oven with crucible then, when the roasting material temperature in the crucible is reduced to 400 ℃, takes out roasting material and places air to naturally cool to 27 ℃, makes andaluzite from pulverizing material; This andaluzite is 10～35 μ m from the granularity of pulverizing material, the reaching more than 98% from degradation rate of roasting material;
The 3rd step: the system andaluzite leaches ore pulp
The andaluzite that second step is made is 8% yellow soda ash Na from pulverizing material and concentration
2CO
3Solution is mixed and made into ore pulp in agitator, heating ore pulp to 85 ℃, and mechanical stirring 50min makes andaluzite and leaches ore pulp;
The andaluzite of 100g is from pulverizing the sodium carbonate solution that 400L is arranged in the material in this ore pulp;
Mechanical stirring speed is 1000r/min;
The 4th step: impurity and purification are handled
The andaluzite leaching ore pulp that the 3rd step made is removed slag through the A filtering net, make thick leach liquor; In the thick leach liquor of 100L, add 8kg impurity and purification agent, stir, after the B filtering net is removed impurity, make sodium aluminate solution;
Described slag is Dicalcium Phosphate (Feed Grade) (making the main raw material of cement), the silicon-dioxide SiO below 7% more than 90%
2, the aluminium oxide Al below 2%
2O
3, and oxide compound iron, the magnesium oxide of surplus.
Described impurity and purification agent is made up of the calcium oxide CaO of 10 weight parts and the aluminium glue of 5 weight parts; Aluminium glue is Al
2O
3Crystal phase structure is x-ρ, and popular name is an aluminium glue.
Described impurity includes silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V etc.
Contain impurity such as silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V in the general andaluzite raw ore, in the present invention, though the andaluzite raw ore is same these elements that exist in the thick leach liquor that system ball, roasting, leaching, separation obtain, chemical reaction is carried out in this element and impurity and purification agent, generate precipitated calcium silicate, other impurity then by aluminium glue or aluminium hydroxide adsorption precipitation in the A separator.
The 5th step: carbon decomposes
Add the aluminium hydroxide crystal seed of 25g in the sodium aluminate solution with the 4th 1L that obtain of step, and to feed concentration be 20% carbon dioxide, under 60 ℃ of conditions, carry out carbon branch disaggregating treatment, make aluminium hydroxide;
The sodium aluminate solution that contains aluminium hydroxide crystal seed stops to feed carbon dioxide when pH=8;
The 6th step: hydro-thermal is synthetic to be handled
Go on foot the volatile salt (NH4) that adds 5 weight parts in the aluminium hydroxide that makes 100 weight parts the 5th
2CO
3Carry out the synthetic processing of hydro-thermal as sodium removing agent, obtain the high purity aluminium hydroxide Al (OH) of purity 99.97%
3
Described hydro-thermal synthesis temperature is 150 ℃, and pressure is 10MPa, and the synthetic treatment time of hydro-thermal is controlled to be 90min;
The 7th step: powder is made in atomizing
Go on foot the high purity aluminium hydroxide Al (OH) that obtains with the 6th
3The thermal treatment of spraying obtains the aluminium oxide Al that granularity is 1～15 μ m
2O
3Powder, aluminium oxide Al
2O
3Powder whiteness is more than 97.
Described spraying thermal treatment process condition is: temperature is 1200 ℃, and pressure is 10MPa.
Alumina powder jointed its purity that makes through this method is 99.97%.
Embodiment 2:
The aluminum oxide grade that comprises in the andaluzite mine tailing is 35wt%, silicon oxide-containing 50wt%, and ferric oxide 8wt%, surplus is other impurity.
The first step: pulverize andaluzite mine tailing system ball
With granularity less than the andalusite mine of 50 weight parts of 0.5mm and granularity less than the activator mix of 50 weight parts of 0.5mm evenly after, make the pelletizing that granularity is 60mm through apparatus for making pearl ball;
Described activator is by the Calcium Fluoride (Fluorspan) CaF that adds 1 weight part among the calcium oxide CaO of 100 weight parts
2Form;
Second step: roasting system andaluzite is from pulverizing material
The pelletizing that the first step is made makes roasting material at 1100 ℃ of following roasting 90min of temperature;
Roasting material shifts out stoving oven with crucible then, when the roasting material temperature in the crucible is reduced to 300 ℃, takes out roasting material and places air to naturally cool to 18 ℃, makes andaluzite from pulverizing material; This andaluzite is 40～50 μ m from the granularity of pulverizing material, the reaching more than 98% from degradation rate of roasting material;
The 3rd step: the system andaluzite leaches ore pulp
The andaluzite that second step is made is 6% yellow soda ash Na from pulverizing material and concentration
2CO
3Solution is mixed and made into ore pulp in agitator, heating ore pulp to 60 ℃, and mechanical stirring 80min makes andaluzite and leaches ore pulp;
The andaluzite of 100g is from pulverizing the sodium carbonate solution that 200L is arranged in the material in this ore pulp;
Mechanical stirring speed is 700r/min;
The 4th step: impurity and purification are handled
The andaluzite leaching ore pulp that the 3rd step made is removed slag through the A filtering net, make thick leach liquor; In the thick leach liquor of 100L, add 2kg impurity and purification agent, stir, after the B filtering net is removed impurity, make sodium aluminate solution;
Described slag is Dicalcium Phosphate (Feed Grade) (making the main raw material of cement), the silicon-dioxide SiO below 7% more than 90%
2, the aluminium oxide Al below 2%
2O
3, and oxide compound iron, the magnesium oxide of surplus.
Described impurity and purification agent is by the calcium oxide CaO of 10 weight parts and the aluminium hydroxide Al (OH) of 3 weight parts
3Form;
Described impurity includes silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V etc.
Contain impurity such as silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V in the general andaluzite raw ore, in the present invention, though the andaluzite raw ore is same these elements that exist in the thick leach liquor that system ball, roasting, leaching, separation obtain, chemical reaction is carried out in this element and impurity and purification agent, generate precipitated calcium silicate, other impurity then by aluminium glue or aluminium hydroxide adsorption precipitation in the A separator.
The 5th step: carbon decomposes
Add the aluminium hydroxide crystal seed of 15g in the sodium aluminate solution with the 4th 1L that obtain of step, and to feed concentration be 36% carbon dioxide, under 40 ℃ of conditions, carry out carbon branch disaggregating treatment, make aluminium hydroxide;
The sodium aluminate solution that contains aluminium hydroxide crystal seed stops to feed carbon dioxide when pH=9;
The 6th step: hydro-thermal is synthetic to be handled
In the 5th aluminium hydroxide that makes of step, add sodium removing agent and carry out that hydro-thermal is synthetic to be handled, obtain the high purity aluminium hydroxide Al (OH) of purity 99.5%
3
Described hydro-thermal synthesis temperature is 110 ℃, and pressure is 1MPa, and the synthetic treatment time of hydro-thermal is controlled to be 120min;
Described sodium removing agent is volatile salt (NH4)
2CO
3, bicarbonate of ammonia NH
4HCO
3Combination, during combination by weight 1: 1 the preparation sodium removing agent.
The consumption of described sodium removing agent is to add 0.3 weight part sodium removing agent in the neutral hydrogen aluminum oxide of 100 weight parts;
The 7th step: powder is made in atomizing
Go on foot the high purity aluminium hydroxide Al (OH) that obtains with the 6th
3The thermal treatment of spraying obtains the aluminium oxide Al that granularity is 20～30 μ m
2O
3Powder, aluminium oxide Al
2O
3Powder whiteness is more than 97.
Described spraying thermal treatment process condition is: temperature is 900 ℃, and pressure is 1MPa.
Alumina powder jointed its purity that makes through this method is 99.5%.
Embodiment 3:
The aluminum oxide grade that comprises in the andaluzite mine tailing is 52wt%, silicon oxide-containing 38wt%, and ferric oxide 4wt%, surplus is other impurity.
The first step: pulverize andaluzite mine tailing system ball
With granularity less than the andalusite mine of 40 weight parts of 0.5mm and granularity less than the activator mix of 60 weight parts of 0.5mm evenly after, make the pelletizing that granularity is 30mm through apparatus for making pearl ball;
Described activator is by the Calcium Fluoride (Fluorspan) CaF that adds 3 weight parts among the calcium oxide CaO of 100 weight parts
2Form;
Second step: roasting system andaluzite is from pulverizing material
The pelletizing that the first step is made makes roasting material at 1200 ℃ of following roasting 90min of temperature;
Roasting material shifts out stoving oven with crucible then, when the roasting material temperature in the crucible is reduced to 400 ℃, takes out roasting material and places air to naturally cool to 18 ℃, makes andaluzite from pulverizing material; This andaluzite is 30～50 μ m from the granularity of pulverizing material, the reaching more than 98% from degradation rate of roasting material;
The 3rd step: the system andaluzite leaches ore pulp
The andaluzite that second step is made is 8% yellow soda ash Na from pulverizing material and concentration
2CO
3Solution is mixed and made into ore pulp in agitator, heating ore pulp to 60 ℃, and mechanical stirring 70min makes andaluzite and leaches ore pulp;
The andaluzite of 100g is from pulverizing the sodium carbonate solution that 300L is arranged in the material in this ore pulp;
Mechanical stirring speed is 800r/min;
The 4th step: impurity and purification are handled
The andaluzite leaching ore pulp that the 3rd step made is removed slag through the A filtering net, make thick leach liquor; In the thick leach liquor of 100L, add 5kg impurity and purification agent, stir, after the B filtering net is removed impurity, make sodium aluminate solution;
Described slag is Dicalcium Phosphate (Feed Grade) (making the main raw material of cement), the silicon-dioxide SiO below 7% more than 90%
2, the aluminium oxide Al below 2%
2O
3, and oxide compound iron, the magnesium oxide of surplus.
Described impurity and purification agent is made up of the calcium oxide CaO of 10 weight parts and the aluminium glue of 4 weight parts;
Described impurity includes silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V etc.
Contain impurity such as silicon Si, iron Fe, calcium Ca, magnesium Mg, titanium Ti, vanadium V in the general andaluzite raw ore, in the present invention, though the andaluzite raw ore is same these elements that exist in the thick leach liquor that system ball, roasting, leaching, separation obtain, chemical reaction is carried out in this element and impurity and purification agent, generate precipitated calcium silicate, other impurity then by aluminium glue or aluminium hydroxide adsorption precipitation in the A separator.
The 5th step: carbon decomposes
Add the aluminium hydroxide crystal seed of 20g in the sodium aluminate solution with the 4th 1L that obtain of step, and to feed concentration be 36% carbon dioxide, under 60 ℃ of conditions, carry out carbon branch disaggregating treatment, make aluminium hydroxide;
The sodium aluminate solution that contains aluminium hydroxide crystal seed stops to feed carbon dioxide when pH=8;
The 6th step: hydro-thermal is synthetic to be handled
In the 5th aluminium hydroxide that makes of step, add sodium removing agent and carry out that hydro-thermal is synthetic to be handled, obtain the high purity aluminium hydroxide Al (OH) of purity 99.999%
3
Described hydro-thermal synthesis temperature is 130 ℃, and pressure is 5MPa, and the synthetic treatment time of hydro-thermal is controlled to be 80min;
Described sodium removing agent is volatile salt (NH4)
2CO
3, bicarbonate of ammonia NH
4HCO
3Combination, during combination by weight 1: 1 the preparation sodium removing agent.
The consumption of described sodium removing agent is to add 2.5 weight part sodium removing agents in the neutral hydrogen aluminum oxide of 100 weight parts;
The 7th step: powder is made in atomizing
Go on foot the high purity aluminium hydroxide Al (OH) that obtains with the 6th
3The thermal treatment of spraying obtains the aluminium oxide Al that granularity is 20～30 μ m
2O
3Powder, aluminium oxide Al
2O
3Powder whiteness is 98.
Described spraying thermal treatment process condition is: temperature is 1100 ℃, and pressure is 5MPa.
Alumina powder jointed its purity that makes through this method is 99.999%.
Claims (6)
1. one kind is the method for feedstock production chemical aluminum oxide with the andaluzite, it is characterized in that following preparation steps is arranged:
The first step: pulverize andalusite mine system ball
With granularity less than the andalusite mine of 40～50 weight parts of 0.5mm and granularity less than the activator mix of 50～60 weight parts of 0.5mm evenly after, make the pelletizing that granularity is 10～60mm through apparatus for making pearl ball;
The Calcium Fluoride (Fluorspan) CaF that adds 1～5 weight part among the calcium oxide CaO of described activator by 100 weight parts
2Form;
Second step: roasting system andaluzite is from pulverizing material
The pelletizing that the first step is made makes roasting material at 1100～1300 ℃ of following roasting 40～90min of temperature;
Roasting material shifts out stoving oven with crucible then, when the roasting material temperature in the crucible is reduced to 300～400 ℃, takes out roasting material and places air to naturally cool to 18～27 ℃, makes andaluzite from pulverizing material; This andaluzite is 10～50 μ m from the granularity of pulverizing material, the reaching more than 98% from degradation rate of roasting material;
The 3rd step: the system andaluzite leaches ore pulp
The andaluzite that second step is made is 6～8% yellow soda ash Na from pulverizing material and concentration
2CO
3Solution is mixed and made into ore pulp in agitator, heating ore pulp to 60～85 ℃, and mechanical stirring 50～80min makes andaluzite and leaches ore pulp;
The andaluzite of 100g is from pulverizing the sodium carbonate solution that 200～400L is arranged in the material in this ore pulp;
Mechanical stirring speed is 700～1000r/min;
The 4th step: impurity and purification are handled
The andaluzite leaching ore pulp that the 3rd step made is removed slag through the A filtering net, make thick leach liquor; In the thick leach liquor of 100L, add 2～8kg impurity and purification agent, stir, after the B filtering net is removed impurity, make sodium aluminate solution;
Described impurity and purification agent is made up of the calcium oxide CaO of 10 weight parts and the aluminium glue of 3～5 weight parts;
The 5th step: carbon decomposes
Add the aluminium hydroxide crystal seed of 15～25g in the sodium aluminate solution with the 4th 1L that obtain of step, and to feed concentration be 20～36% carbon dioxide, under 40～60 ℃ of conditions, carry out carbon branch disaggregating treatment, make aluminium hydroxide;
The sodium aluminate solution that contains aluminium hydroxide crystal seed stops to feed carbon dioxide in pH=8～9 o'clock;
The 6th step: hydro-thermal is synthetic to be handled
In the 5th aluminium hydroxide that makes of step, add sodium removing agent and carry out that hydro-thermal is synthetic to be handled, obtain the high purity aluminium hydroxide of purity 99.5～99.999%;
Described hydro-thermal synthesis temperature is 110～150 ℃, and pressure is 1～10MPa, and the synthetic treatment time of hydro-thermal is controlled to be 30～120min;
Described sodium removing agent is a kind of of volatile salt, bicarbonate of ammonia;
The consumption of described sodium removing agent is to add 0.3～5 weight part sodium removing agent in the neutral hydrogen aluminum oxide of 100 weight parts;
The 7th step: powder is made in atomizing
With the thermal treatment of spraying of the 6th high purity aluminium hydroxide that obtain of step, obtaining granularity is the alumina powder jointed of 1～30 μ m, alumina powder jointed from degree more than 97;
Described spraying thermal treatment process condition is: temperature is 900～1200 ℃, and pressure is 1～10MPa.
2. according to claim 1 is the method for feedstock production chemical aluminum oxide with the andaluzite, it is characterized in that:
Slag described in the 4th step is oxide compound iron, the magnesium oxide of Dicalcium Phosphate (Feed Grade), the silicon-dioxide below 7%, the aluminum oxide below 2% and surplus more than 90%.
3. according to claim 1 is the method for feedstock production chemical aluminum oxide with the andaluzite, it is characterized in that:
Impurity and purification agent described in the 4th step is made up of the calcium oxide of 10 weight parts and the aluminium hydroxide of 3～5 weight parts.
4. according to claim 1 is the method for feedstock production chemical aluminum oxide with the andaluzite, it is characterized in that:
Impurity includes silicon, iron, calcium, magnesium, titanium, vanadium described in the 4th step.
5. according to claim 1 is the method for feedstock production chemical aluminum oxide with the andaluzite, it is characterized in that:
Sodium removing agent is the combination by volatile salt and bicarbonate of ammonia described in the 6th step, 1: the 1 preparation sodium removing agent by weight during combination.
6. according to claim 1 is the method for feedstock production chemical aluminum oxide with the andaluzite, it is characterized in that: the purity of the chemical aluminum oxide for preparing is 99.5～99.999%.
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