CN104058436A - Device and method for preparing aluminum oxide by roasting crystalline aluminum chloride hexahydrate in rotary kiln - Google Patents
Device and method for preparing aluminum oxide by roasting crystalline aluminum chloride hexahydrate in rotary kiln Download PDFInfo
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- CN104058436A CN104058436A CN201410259633.4A CN201410259633A CN104058436A CN 104058436 A CN104058436 A CN 104058436A CN 201410259633 A CN201410259633 A CN 201410259633A CN 104058436 A CN104058436 A CN 104058436A
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Abstract
The invention provides a device and a method for preparing aluminum oxide by roasting crystalline aluminum chloride hexahydrate in a rotary kiln, wherein the kiln head part of the roasting rotary kiln is connected with a combustion fan and a heavy oil heater by use of pipelines; a feeding hole formed at the bottom end of the kiln head part of the roasting rotary kiln is communicated with a cooling kiln; the outlet of the cooling kiln is communicated with a belt packing machine; the kiln tail part of the roasting rotary kiln is communicated with a bottom ash outlet of a cyclone separator and a feed pipe. The crystalline aluminum chloride hexahydrate material to be roasted is fed into the roasting rotary kiln via the feed pipe from the kiln tail part of the roasting rotary kiln; the crystalline aluminum chloride hexahydrate material goes oppositely to flue gas and has drastic heat and mass transfer reaction with the flue gas, and thus is transformed into an aluminum oxide powder; the aluminum oxide powder is taken as the product and discharged into the cooling kiln. The device and the method are capable of extracting the metallurgical aluminum oxide from the crystalline aluminum chloride successfully; meanwhile, hydrochloric acid can be recovered from the flue gas generated and used for previous sections, and therefore, comprehensive utilization of coal ash is realized.
Description
Technical field
The invention belongs to waste ' s reclamation technology, be specially in total utilization of PCA process and use rotary kiln baking six water crystallization aluminum chloride to prepare the device and method of technical grade aluminum oxide.
Background technology
Flyash is the solid waste that coal-burning power plant discharges, the industrial solid castoff of quantity discharged maximum in Ye Shi China industrial circle.Along with the development of power industry, the flyash quantity discharged of coal-burning power plant increases year by year, and flyash has become one of industrial residue that the current discharge capacity of China is larger, and ecotope has been caused to serious destruction.Therefore the comprehensive utilization of, carrying out flyash has its own strategic significance.
Aluminium is as the second largest metal that is only second to iron, in the every field of national economy, plays an important role.But along with the increase of demand, the quantity of existing bauxite can not meet industrial requirement.Flyash, as a kind of special resource that contains aluminium and silicon, has become the primary study object of countries in the world recycling.Many scientific research institutions actively develop aluminous fly-ash comprehensive utilization and produce the research of aluminum oxide project.For the higher circulating fluid bed coal ash of activity, the normal method of direct and acid-respons that adopts is prepared aluminum oxide.Flyash acidic process extracts aluminum oxide has become a kind of trend.Main technique tends to flyash after stripping, to generate Aluminum Chloride Hexahydrate successively through sedimentation, evaporative crystallization in hydrochloric acid, then produces aluminum oxide by Aluminum Chloride Hexahydrate.But preparing Technology and the roasting apparatus of technical grade aluminum oxide, Aluminum Chloride Hexahydrate still there is no maturation application example widely.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of device and method that uses rotary kiln baking six water crystallization aluminum chloride to prepare technical grade aluminum oxide is provided, realize extraction and the utilization of aluminium salt in flyash.
Realize the technical scheme of the object of the invention: a kind of rotary kiln baking six water crystallization aluminum chloride are prepared the device of aluminum oxide, this device comprises calcination rotary kiln, cooling kiln, cyclonic separator, burner blower, belt pack installation and heavy oil heater; Wherein, the kiln hood position of calcination rotary kiln is connected by pipeline with heavy oil heater with burner blower, and burner blower is used for providing air, and heavy oil heater is for providing the heavy oil after heating; Bottom, the kiln hood position feed opening of calcination rotary kiln is communicated with cooling kiln; Cooling kiln outlet is connected with belt pack installation; The kiln tail bit of calcination rotary kiln is connected with bottom deslagging mouth and the filling tube of cyclonic separator; The top gas approach of cyclonic separator and the kiln tail bit of calcination rotary kiln are connected; Flue gas, after dedusting, enters after-treatment system from cyclonic separator top exit is discharged.
A kind of rotary kiln baking six water crystallization aluminum chloride as above are prepared the device of aluminum oxide, and the heavy oil heater described in it is connected with petroleum pump, and heavy oil enters heavy oil heater after petroleum pump is pressurized to 1.2～1.6MPa.g.
A kind of rotary kiln baking six water crystallization aluminum chloride as above are prepared the device of aluminum oxide, and its whole device remains negative pressure, guarantee the kiln hood position-20～-100Pa.g state of calcination rotary kiln.
A kind of rotary kiln baking six water crystallization aluminum chloride of the present invention are prepared the method for aluminum oxide, and it comprises the steps:
(a) heavy oil enters the kiln hood position of calcination rotary kiln after being heated by steam heat-exchanging in heavy oil heater after petroleum pump is pressurized to 1.2～1.6MPa.g, form flue gas with the air mixed burning from burner blower, and form the steady temperature field of 1100～1300 ℃ at the kiln hood position of calcination rotary kiln;
(b) the Aluminum Chloride Hexahydrate crystal material for the treatment of roasting is fed in calcination rotary kiln through filling tube from the kiln tail bit of calcination rotary kiln; In the process that Aluminum Chloride Hexahydrate crystal material moves at the kiln hood position to calcination rotary kiln, Aluminum Chloride Hexahydrate crystal material and step (a) flue gas is reverse and go, and violent heat and mass reaction occurs; When Aluminum Chloride Hexahydrate crystal moves to the kiln hood position of calcination rotary kiln, become temperature and be the alumina powder of 700～1000 ℃, as product, the feed opening by the bottom, kiln hood position of calcination rotary kiln is discharged in cooling kiln this alumina powder;
(c) in cooling kiln, the alumina powder of step (b) gained on one side with the water coolant indirect heat exchange of cooling kiln outer wall, the freezing air direct heat exchange that sucks with head from cooling kiln on one side, alumina powder is cooled fast to 75～85 ℃, and last alumina powder enters belt pack installation.
A kind of rotary kiln baking six water crystallization aluminum chloride as above are prepared the method for aluminum oxide, in its step (a), the flue gas that the kiln hood position heavy oil combustion of calcination rotary kiln produces is through the kiln body of whole calcination rotary kiln, with the catalytic while of Aluminum Chloride Hexahydrate crystal material, temperature reduces gradually, to the kiln tail bit temperature of calcination rotary kiln, reaches 190～210 ℃; Then flue gas enters in cyclonic separator, and the alumina powder suspending in flue gas is separated, and delivers to the kiln tail bit of calcination rotary kiln from the bottom of cyclonic separator; Flue gas after isolation of purified enters rear absorption system operation, carries out HCl recovery processing.
A kind of rotary kiln baking six water crystallization aluminum chloride as above are prepared the method for aluminum oxide, and its whole device remains negative pressure, guarantee the kiln hood position-20～-100Pa.g state of calcination rotary kiln.
A kind of rotary kiln baking six water crystallization aluminum chloride as above are prepared the method for aluminum oxide, Aluminum Chloride Hexahydrate crystal material described in it and step (a) flue gas are reverse and go, and there is violent heat and mass reaction, comprise following process: the gasification heat absorption of free-water and free HCl, the heat absorption of the desorption of crystal water, the hydrolysis heat release of aluminum chloride and the intensification of aluminum oxide.
Effect of the present invention is: rotary kiln baking six water crystallization aluminum chloride of the present invention are prepared the device and method of aluminum oxide, can successfully from crystal aluminum chloride, extract metallurgical-grade aluminum oxide, in produced simultaneously flue gas, can also reclaim hydrochloric acid Gong Qian workshop section and use, realize the comprehensive utilization of flyash.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that a kind of rotary kiln baking six water crystallization aluminum chloride of the present invention are prepared aluminum oxide.
In figure: 1. calcination rotary kiln; 2. cooling kiln; 3. cyclonic separator; 4. petroleum pump; 5. burner blower; 6. belt pack installation; 7. heavy oil heater; 8. filling tube.
Embodiment
The device and method of a kind of rotary kiln baking six water crystallization aluminum chloride of the present invention being prepared to aluminum oxide below in conjunction with the drawings and specific embodiments is described in further detail.
Embodiment 1
As shown in Figure 1, a kind of rotary kiln baking six water crystallization aluminum chloride of the present invention are prepared the device of aluminum oxide, and it comprises calcination rotary kiln 1, cooling kiln 2, cyclonic separator 3, petroleum pump 4, burner blower 5, belt pack installation 6 and heavy oil heater 7;
Wherein, wherein the kiln hood position of calcination rotary kiln 1 is connected by pipeline with heavy oil heater 7 with burner blower 5, and burner blower 5 is for air is provided, and heavy oil heater 7 is for providing the heavy oil after heating; Bottom, the kiln hood position feed opening of calcination rotary kiln 1 is communicated with cooling kiln 2; Cooling kiln 2 outlets are connected with belt pack installation 6;
The kiln tail bit of calcination rotary kiln 1 is connected with the bottom inlet of cyclonic separator 3 and filling tube 8;
The top gas approach of cyclonic separator 3 and the kiln tail bit of calcination rotary kiln 1 are connected; Flue gas, after dedusting, enters after-treatment system from cyclonic separator top exit is discharged.
Heavy oil heater 7 is connected with petroleum pump 4, and heavy oil enters heavy oil heater 7 after petroleum pump 4 is pressurized to 1.2～1.6MPa.g.
Whole device remains negative pressure, guarantees the kiln hood position-20～-100Pa.g state of calcination rotary kiln 1.
Embodiment 2
Described in employing embodiment 1, the rotary kiln baking six water crystallization aluminum chloride of device are prepared the method for aluminum oxide, and it comprises the steps:
(a) heavy oil (for example: No. 200 heavy oil or other label heavy oil) for example, enters the kiln hood position of calcination rotary kiln 1 after being heated by steam heat-exchanging in heavy oil heater 7 after petroleum pump 4 pressurization 1.2～1.6MPa.g (: 1.2MPa.g, 1.4MPa.g or 1.6MPa.g), form flue gas with the air mixed burning from burner blower 5, and at the kiln hood position of calcination rotary kiln 1, form the steady temperature field of 1100～1300 ℃ (for example: 1100 ℃, 1200 ℃ or 1300 ℃);
(b) the Aluminum Chloride Hexahydrate crystal material for the treatment of roasting is fed in calcination rotary kiln 1 through filling tube 8 from the kiln tail bit of calcination rotary kiln 1; In the process that Aluminum Chloride Hexahydrate crystal material moves at the kiln hood position to calcination rotary kiln 1, Aluminum Chloride Hexahydrate crystal material and step (a) flue gas is reverse and go, and there is violent heat and mass reaction, specifically comprise following process: the gasification heat absorption of free-water and free HCl, the heat absorption of the desorption of crystal water, the hydrolysis heat release of aluminum chloride and the intensification of aluminum oxide.When Aluminum Chloride Hexahydrate crystal moves to the kiln hood position of calcination rotary kiln 1, becoming temperature is the alumina powder of 700～1000 ℃ (for example: 700 ℃, 850 ℃ or 1000 ℃), and as product, the feed opening by the bottom, kiln hood position of calcination rotary kiln 1 is discharged in cooling kiln 2 this alumina powder;
(c) in cooling kiln 2, the alumina powder of step (b) gained on one side with the water coolant indirect heat exchange of cooling kiln 2 outer walls, the freezing air direct heat exchange that sucks with head from cooling kiln 2 on one side, alumina powder is cooled fast to 75～85 ℃ (for example: 75 ℃, 80 ℃ or 85 ℃), and last alumina powder enters belt pack installation 6.
The flue gas that the kiln hood position heavy oil combustion of calcination rotary kiln 1 produces is through the kiln body of whole calcination rotary kiln 1, with the catalytic while of Aluminum Chloride Hexahydrate crystal material, temperature reduces gradually, to the kiln tail bit temperature of calcination rotary kiln 1, reaches 190～210 ℃ (for example: 190 ℃, 200 ℃ or 210 ℃); Then flue gas enters in cyclonic separator 3, and the alumina powder suspending in flue gas is separated, and delivers to the kiln tail bit of calcination rotary kiln 1 from the bottom of cyclonic separator 3; Flue gas after isolation of purified enters rear absorption system operation, carries out HCl recovery processing, and whole roasting flow process completes.
Whole device remain negative pressure-20～-100Pa.g (for example :-20Pa.g ,-70Pa.g or-100Pa.g) state.
Claims (7)
1. rotary kiln baking six water crystallization aluminum chloride are prepared a device for aluminum oxide, it is characterized in that: this device comprises calcination rotary kiln (1), cooling kiln (2), cyclonic separator (3), burner blower (5), belt pack installation (6) and heavy oil heater (7);
Wherein, the kiln hood position of calcination rotary kiln (1) is connected by pipeline with heavy oil heater (7) with burner blower (5), and burner blower (5) is for air is provided, and heavy oil heater (7) is for providing the heavy oil after heating; Bottom, the kiln hood position feed opening of calcination rotary kiln (1) is communicated with cooling kiln (2); Cooling kiln (2) outlet is connected with belt pack installation (6);
The kiln tail bit of calcination rotary kiln (1) is connected with bottom deslagging mouth and the filling tube (8) of cyclonic separator (3);
The kiln tail bit of the top gas approach of cyclonic separator (3) and calcination rotary kiln (1) is connected; Flue gas, after dedusting, enters after-treatment system from cyclonic separator top exit is discharged.
2. a kind of rotary kiln baking six water crystallization aluminum chloride according to claim 1 are prepared the device of aluminum oxide, it is characterized in that: described heavy oil heater (7) is connected with petroleum pump (4), heavy oil enters heavy oil heater (7) after petroleum pump (4) is pressurized to 1.2～1.6MPa.g.
3. a kind of rotary kiln baking six water crystallization aluminum chloride according to claim 2 are prepared the device of aluminum oxide, it is characterized in that: whole device remains negative pressure, guarantee the kiln hood position-20～-100Pa.g state of calcination rotary kiln (1).
4. adopt the rotary kiln baking six water crystallization aluminum chloride that install described in claims 1 to 3 to prepare a method for aluminum oxide, it is characterized in that, the method comprises the steps:
(a) heavy oil enters the kiln hood position of calcination rotary kiln (1) after being heated by steam heat-exchanging in heavy oil heater (7) after petroleum pump (4) is pressurized to 1.2～1.6MPa.g, form flue gas with the air mixed burning from burner blower (5), and form the steady temperature field of 1100～1300 ℃ at the kiln hood position of calcination rotary kiln (1);
(b) the Aluminum Chloride Hexahydrate crystal material for the treatment of roasting is fed in calcination rotary kiln (1) through filling tube (8) from the kiln tail bit of calcination rotary kiln (1); Aluminum Chloride Hexahydrate crystal material is in the process moving to the kiln hood position of calcination rotary kiln (1), and Aluminum Chloride Hexahydrate crystal material and step (a) flue gas is reverse and go, and violent heat and mass reaction occurs; When Aluminum Chloride Hexahydrate crystal moves to the kiln hood position of calcination rotary kiln (1), become temperature and be the alumina powder of 700～1000 ℃, as product, the feed opening by the bottom, kiln hood position of calcination rotary kiln (1) is discharged in cooling kiln (2) this alumina powder;
(c) in cooling kiln (2), the alumina powder of step (b) gained on one side with the water coolant indirect heat exchange of cooling kiln (2) outer wall, the freezing air direct heat exchange that sucks with head from cooling kiln (2) on one side, alumina powder is cooled fast to 75～85 ℃, and last alumina powder enters belt pack installation (6).
5. a kind of rotary kiln baking six water crystallization aluminum chloride according to claim 4 are prepared the method for aluminum oxide, it is characterized in that, in step (a), the flue gas that the kiln hood position heavy oil combustion of calcination rotary kiln (1) produces is through the kiln body of whole calcination rotary kiln (1), with the catalytic while of Aluminum Chloride Hexahydrate crystal material, temperature reduces gradually, to the kiln tail bit temperature of calcination rotary kiln (1), reaches 190～210 ℃; Then flue gas enters in cyclonic separator (3), and the alumina powder suspending in flue gas is separated, and delivers to the kiln tail bit of calcination rotary kiln (1) from the bottom of cyclonic separator (3); Flue gas after isolation of purified enters rear absorption system operation, carries out HCl recovery processing.
6. a kind of rotary kiln baking six water crystallization aluminum chloride according to claim 4 are prepared the method for aluminum oxide, it is characterized in that, whole device remains negative pressure, guarantee the kiln hood position-20～-100Pa.g state of calcination rotary kiln (1).
7. a kind of rotary kiln baking six water crystallization aluminum chloride according to claim 4 are prepared the method for aluminum oxide, it is characterized in that, described Aluminum Chloride Hexahydrate crystal material and step (a) flue gas are reverse and go, and there is violent heat and mass reaction, comprise following process: the gasification heat absorption of free-water and free HCl, the heat absorption of the desorption of crystal water, the hydrolysis heat release of aluminum chloride and the intensification of aluminum oxide.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109970096A (en) * | 2019-05-08 | 2019-07-05 | 扬州新达锌业有限公司 | A kind of high-density zinc oxide processing technology |
| CN111517343A (en) * | 2020-05-15 | 2020-08-11 | 江西鹏腾实业有限公司 | Preparation method of high-purity nano aluminum oxide |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107601538B (en) * | 2017-11-11 | 2019-03-19 | 郑州大学 | A kind of method of low temperature preparation alumina ultrafine spherical powder |
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Patent Citations (6)
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| US4107281A (en) * | 1976-08-16 | 1978-08-15 | Aluminum Pechiney | Process for the thermal decomposition of aluminum chloride hexahydrate to obtain alumina |
| CA2175624A1 (en) * | 1995-05-08 | 1996-11-09 | Richard D. Lindsay | Process for treatment of reactive fines |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109970096A (en) * | 2019-05-08 | 2019-07-05 | 扬州新达锌业有限公司 | A kind of high-density zinc oxide processing technology |
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| CN111517343A (en) * | 2020-05-15 | 2020-08-11 | 江西鹏腾实业有限公司 | Preparation method of high-purity nano aluminum oxide |
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