CN110510647A - The method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting - Google Patents
The method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting Download PDFInfo
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- CN110510647A CN110510647A CN201910903112.0A CN201910903112A CN110510647A CN 110510647 A CN110510647 A CN 110510647A CN 201910903112 A CN201910903112 A CN 201910903112A CN 110510647 A CN110510647 A CN 110510647A
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/745—Preparation from sulfates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/008—Preparation of potassium sulfate from alunite
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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
- C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
- C01F7/32—Thermal decomposition of sulfates including complex sulfates, e.g. alums
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a kind of methods that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting, it potassium alum is put into the first suspension roasting furnace system carries out roasting and dehydration and preheat, then it will preheat and dewatered anhydrous potassium alum is introduced into progress high temperature suspension roasting decomposition in the second suspension roasting furnace system, pyroreaction object after decomposition is after cooler is cooling, by it is water-soluble go out after filtration washing and it is dry obtain alumina powder, obtain potassium sulfate after leaching liquid condensing crystallizing；The pyrolysis gas of second suspension roasting furnace system obtains the concentrated sulfuric acid after waste heat recycling and catalysis oxidation absorb；Potassium alum is removed mass crystallization moisture in the first shower furnace and preheated by the present invention, it can be decomposed rapidly in the second shower furnace, the moisture in the second shower furnace in pyrolysis gas can be greatly reduced, reduce energy consumption, and improve the concentration of sulfur dioxide and sulfur trioxide in pyrolysis gas, so that subsequent waste heat recycling and sulfuric acid absorption etc. is facilitated progress, and realizes comprehensive utilization.
Description
Technical field
The invention belongs to field of thermometallurgical technology, and in particular to a kind of potassium alum suspension roasting decompose production aluminium oxide,
The method of potassium sulfate and sulfuric acid.
Background technique
Al2O3It is a kind of important inorganic powder material, there are the good characteristics such as high temperature resistant, corrosion-resistant, wear-resistant, extensively
Applied to fields such as metallurgy, mechanical industry, sensor, bioceramics.China possess it is vast till the land, soil generally lacks
Potassium, and long-term Potassium Fertilizer Application is insufficient, especially the demand of chlorideless potassic fertilizer is continuously improved in recent years.Potassium sulfate is as common one
It plants chlorideless potassic fertilizer and the sulphur in soil can be supplemented, sulphur is conducive to the formation of chlorophyll, protein and carbohydrate, can improve
Crop yield and quality, but China's Production of Potassium Sulphate is started late, and nowadays still wants a large amount of potassium sulfate of import every year, it is right
Outer interdependency is in 60 % or more；And the industry byproduct that potassium alum is common as one kind, yield are unable to get make full use of greatly；It is comprehensive
Upper described, develop one is necessary using the potassium sulfate of potassium alum production high value and the technology path of aluminium oxide.
Traditional potassium alum pyrolysismethod generallys use fixed bed and rotary kiln, with maturing temperature be difficult to control, equipment compared with
To be huge, calcining time is long (> 1h), and processing capacity is limited, and energy consumption is high, at high cost, decomposes insufficient disadvantage；The present invention uses
The method that suspension roasting is decomposed, enables material to come into full contact with high-temperature gas, and the control of suspension furnace temperature is more accurate, can
To control at 10 DEG C or so, the phenomenon that local overheating melts is avoided.
Summary of the invention
The present invention provides a kind of method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting, solutions
It has determined and potassium in current potassium alum, aluminium the problem of cannot obtaining simple, efficient utilization and has overcome traditional potassium alum method of roasting
Deficiency, have equipment simple, the advantages that residence time of material is short, at low cost, and processing capacity is strong, and temperature control is accurate.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting comprising following steps:
1) potassium alum is crushed to certain partial size with crusher；
2) broken potassium alum is continuously transmitted into the primary air stream preheater in the first suspension roasting furnace system, is entered back into
Secondary air flow preheater to the first suspension roasting furnace system carries out preliminary hydro-extraction preheating, the tail after the separation of primary air stream preheater
For gas again through dust-extraction unit dedusting, the potassium alum powder that tails dedusting obtains puts into the secondary air flow in the first suspension roasting furnace system
Secondary preheating is dry in preheater；
3) potassium alum after second level preheating and drying is transferred to the first suspension roaster, and from suspension roaster bottom heating device
High-temperature gas is sufficiently mixed, and gas solid separation, isolated high temperature are collected and carried out by the first rotoclone collector of subsequent connection
Gas is introduced into the secondary air flow preheater in the first suspension roasting furnace system, is re-introduced into primary air stream preheater；
4) obtained anhydrous potassium alum is delivered continuously in the primary air stream preheater in the second shower furnace roasting system, then into
Enter to the secondary air flow preheater in the second suspension furnace system and preheated, the tail gas after the separation of primary air stream preheater is through dedusting
The sulfur-containing tail gas obtained after device dedusting obtains by-product through sulfuric acid catalysis absorption system again through dust-extraction unit dedusting, sulfur-containing tail gas
Sulfuric acid is discharged in atmosphere after remaining tail gas environment protection standard through blower；
5) the anhydrous potassium alum in step 4) after the secondary air flow preheater preheating of the second suspension furnace system is delivered continuously to second
Suspension roaster is sufficiently mixed progress Roasting Decomposition with the high-temperature gas from suspension roaster combustion bottom burner and reacts, and leads to
It crosses latter linked rotoclone collector collection and gas solid separation, isolated high-temperature gas is introduced into the second suspension roasting furnace system
Secondary air flow preheater is re-introduced into primary air stream preheater；Material after the decomposition of second suspension roaster is used after supercooling
The filter cake of potassium sulfate solution and aluminium oxide is obtained after water extraction solid-liquor separation, potassium sulfate solution condensing crystallizing obtains potassium sulfate and produces
Product, aluminium oxide filter cake obtain alumina product after drying；
6) material separated in step 5) is transferred in air fluidizing cooler to be cooled down with air, will be added in aerial cooler
The air of heat is blown into the burner in the first suspension roasting furnace system or the second suspension roasting furnace system with air blower.
Potassium alum is crushed to 5mm or less in step 1)；
Preheating gas difference in step 2 in the primary air stream preheater and secondary air flow preheater of the first suspension roasting system
Secondary air flow preheater and the second rotoclone collector from the first suspension roasting system, material and High Temperature Gas in air-flow preheater
The body direction of motion is consistent；Empty the temperature of tail gas are as follows: 100-200 DEG C；
Material in step 3) after the roasting of the first suspension roasting furnace system is anhydrous potassium alum water content < 0.5%, is transported to second
The dehydration potassium alum temperature of charge of suspension roaster is 100-600 DEG C；
The reaction temperature of material Roasting Decomposition in the second suspension roaster is 960-1060 DEG C in step 5), when reactant stops
Between be 5-120s, the direction of motion in furnace is consistent with material for high-temperature gas.
The potassium alum resolution ratio of this method processing is greater than 96%.
The beneficial effects of the present invention are:
(1) potassium alum is easy containing crystallization water tap nearly 50%, the temperature control of two sections of suspension roasting, the problem for avoiding melting from crusting,
High-efficient, low energy consumption, avoid local temperature it is excessively high and generate sintering phenomenon.
(2) dehydration potassium alum decomposes rapidly in the second shower furnace, and pyrolysis gas moisture content is low, sulfur dioxide and three oxygen
The content for changing sulphur is high, and subsequent waste heat recycling and sulfuric acid absorption is made to facilitate progress.
Detailed description of the invention
Fig. 1 is the flow diagram that potassium alum suspension roasting of the present invention is decomposed, wherein 1,2- first suspension roasting furnace system
In level-one, secondary air flow preheater；Level-one, secondary air flow preheater in 6,7- the second suspension roasting furnace system；3,8-the
One, the second suspension roaster；5,11- first, the second rotoclone collector；4,9 one dust-extraction units；10-sulfuric acid catalysis absorb dress
It sets；12- aerial cooler；13- water immersion；14,15- burners.
Specific embodiment
The present invention is further illustrated by the following examples, but protection scope of the present invention is not limited to following reality
Example.
Embodiment 1
A kind of method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting, specific steps are as follows:
Potassium alum after partial size to be crushed to 5mm or less is continuously transmitted to the primary air stream preheating in the first suspension roasting furnace system
In device, enters back into the secondary air flow preheater in the first suspension furnace system and carry out preliminary hydro-extraction preheating, the first suspension roasting system
The second level of preheating gas in the primary air stream preheater and secondary air flow preheater of system respectively from the first suspension roasting system
Air-flow preheater and the first rotoclone collector, material is consistent with the high-temperature gas direction of motion in air-flow preheater, and primary air stream is pre-
Tail gas after hot device separation empties 100-200 DEG C of tail gas after dedusting, the potassium that tails dedusting obtains again through dust-extraction unit dedusting
It is dry that alum powder puts into secondary preheating in the secondary air flow preheater in the first suspension roasting furnace system；Second level preheating and drying
Potassium alum afterwards is transferred to the first suspension roaster, sufficiently mixed with the high-temperature gas from the first suspension roaster bottom heating device
It closes, gas solid separation is collected and carried out by the first rotoclone collector of subsequent connection, it is outstanding that isolated high-temperature gas is introduced into first
Secondary air flow preheater in floating roaster system, is re-introduced into primary air stream preheater；By the nothing of obtained water content < 0.5%
Water potassium alum is delivered continuously in the primary air stream preheater in the second shower furnace roaster system, is entered back into the second shower furnace
Secondary air flow preheater in system is preheated, and temperature of charge is 100-600 DEG C after preheating, after the separation of primary air stream preheater
Tail gas sulfur-containing tail gas is obtained after dust-extraction unit dedusting, sulfur-containing tail gas obtains by-product sulfuric acid through sulfuric acid catalysis absorption system,
It is discharged in atmosphere after remaining tail gas environment protection standard through blower；Anhydrous potassium alum after the preheating of secondary air flow preheater is delivered continuously to
Second suspension roaster is sufficiently mixed with the high-temperature gas from suspension roaster combustion bottom burner and is rapidly heated to 1060
Roasting Decomposition reaction is carried out after DEG C, reactant residence time 30s, the direction of motion in furnace is consistent with material for high-temperature gas, and
It is collected by the second rotoclone collector of subsequent connection and gas solid separation, isolated high-temperature gas is introduced into the second suspension roaster
Secondary air flow preheater in system, is re-introduced into primary air stream preheater；Material after second suspension roaster decomposes passes through
After aerial cooler is cooling, with the filter cake for obtaining potassium sulfate solution and aluminium oxide after water extraction solid-liquor separation, potassium sulfate solution
Condensing crystallizing obtains potassium product, and aluminium oxide filter cake obtains alumina product after drying；It will be added in aerial cooler
The air of heat is blown into the burner in the first suspension roasting furnace system or the second suspension roasting furnace system with air blower.Potassium alum warp
This time the resolution ratio after process is 97.5%.
Embodiment 2
A kind of method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting, specific steps are as follows:
Potassium alum after partial size to be crushed to 3mm or less is continuously transmitted to the primary air stream preheating in the first suspension roasting furnace system
In device, enters back into the secondary air flow preheater in the first suspension furnace system and carry out preliminary hydro-extraction preheating, the first suspension roasting system
Preheating gas in the primary air stream preheater and secondary air flow preheater of system is respectively from the two of the first suspension roasting furnace system
Grade air-flow preheater and the first rotoclone collector, material is consistent with the high-temperature gas direction of motion in air-flow preheater, primary air stream
Tail gas after preheater separation empties 100-200 DEG C of tail gas after dedusting again through dust-extraction unit dedusting, what tails dedusting obtained
It is dry that potassium alum powder puts into secondary preheating in the secondary air flow preheater in the first suspension roasting furnace system；Second level preheating is dry
Potassium alum after dry is transferred to the first suspension roaster, abundant with the high-temperature gas from the first suspension roaster bottom heating device
Mixing, and collects by the first rotoclone collector of subsequent connection and carries out gas solid separation, and isolated high-temperature gas is introduced into the
Secondary air flow preheater in one suspension roasting furnace system, is re-introduced into primary air stream preheater；It will obtain water content < 0.5%
Anhydrous potassium alum is delivered continuously in the primary air stream preheater in the second shower furnace roaster system, is entered back into second and is suspended
Secondary air flow preheater in furnace system is preheated, and temperature of charge is 100-600 DEG C after preheating, the separation of primary air stream preheater
Sulfur-containing tail gas afterwards obtains tail gas after dust-extraction unit dedusting, and sulfur-containing tail gas obtains by-product sulphur through sulfuric acid catalysis absorption system
Acid is discharged in atmosphere after remaining tail gas environment protection standard through blower；Anhydrous potassium alum after the preheating of secondary air flow preheater is continuously defeated
It is sent to the second suspension roaster, is sufficiently mixed and is rapidly heated to the high-temperature gas from suspension roaster combustion bottom burner
Roasting Decomposition reaction is carried out after 960 DEG C, reactant residence time 60s, the direction of motion in furnace is consistent with material for high-temperature gas,
And the second suspension roasting is introduced by the collection of the second rotoclone collector of subsequent connection and gas solid separation, isolated high-temperature gas
Secondary air flow preheater in furnace system, is re-introduced into primary air stream preheater；Material after second suspension roaster decomposes passes through
After crossing aerial cooler cooling, with the filter cake for obtaining potassium sulfate solution and aluminium oxide after water extraction solid-liquor separation, potassium sulfate is molten
Liquid condensing crystallizing obtains potassium product, and aluminium oxide filter cake obtains alumina product after drying；By quilt in aerial cooler
The air of heating is blown into the burner in the first suspension roasting furnace system or the second suspension roasting furnace system with air blower.Potassium alum
Resolution ratio after this process is 96.1%.
Embodiment 3
A kind of method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting, specific steps are as follows:
Potassium alum after partial size to be crushed to 1mm or less is continuously transmitted to the primary air stream preheating in the first suspension roasting furnace system
In device, enters back into the secondary air flow preheater in the first suspension furnace system and carry out preliminary hydro-extraction preheating, the first suspension roasting system
Preheating gas in the primary air stream preheater and secondary air flow preheater of system is respectively from the two of the first suspension roasting furnace system
Grade air-flow preheater and the first rotoclone collector, material is consistent with the high-temperature gas direction of motion in air-flow preheater, primary air stream
Tail gas after preheater separation empties 100-200 DEG C of tail gas after dedusting again through dust-extraction unit dedusting, what tails dedusting obtained
It is dry that potassium alum powder puts into secondary preheating in the secondary air flow preheater in the first suspension roasting furnace system；Second level preheating is dry
Potassium alum after dry is transferred to the first suspension roaster, abundant with the high-temperature gas from the first suspension roaster bottom heating device
Mixing, and collects by the first rotoclone collector of subsequent connection and carries out gas solid separation, and isolated high-temperature gas is introduced into the
Secondary air flow preheater in one suspension roasting furnace system, is re-introduced into primary air stream preheater；It will obtain water content < 0.5%
Anhydrous potassium alum is delivered continuously in the primary air stream preheater in the second shower furnace roasting system, is entered back into the second shower furnace
Secondary air flow preheater in system is preheated, and temperature of charge is 100-600 DEG C after preheating, after the separation of primary air stream preheater
Tail gas sulfur-containing tail gas is obtained after dust-extraction unit dedusting, sulfur-containing tail gas obtains by-product sulfuric acid through sulfuric acid catalysis absorption system,
It is discharged in atmosphere after remaining tail gas environment protection standard through blower；Anhydrous potassium alum after the preheating of secondary air flow preheater is delivered continuously to
Second suspension roaster is sufficiently mixed and is rapidly heated to the high-temperature gas from the first suspension roaster combustion bottom burner
Roasting Decomposition reaction is carried out after 860 DEG C, reactant residence time 90s, the direction of motion in furnace is consistent with material for high-temperature gas,
And the second suspension roasting is introduced by the collection of the second rotoclone collector of subsequent connection and gas solid separation, isolated high-temperature gas
Secondary air flow preheater in furnace system, is re-introduced into primary air stream preheater；Material after second suspension roaster decomposes passes through
After crossing aerial cooler cooling, with the filter cake for obtaining potassium sulfate solution and aluminium oxide after water extraction solid-liquor separation, potassium sulfate is molten
Liquid condensing crystallizing obtains potassium product, and aluminium oxide filter cake obtains alumina product after drying；By quilt in aerial cooler
The air of heating is blown into the burner in the first suspension roasting furnace system or the second suspension roasting furnace system with air blower.Potassium alum
Resolution ratio after this process is 96.7%.
The above is a part of the embodiments of the present invention, instead of all the embodiments.It should be pointed out that for this field
For technical staff, the several modifications and improvements done without making creative work also belong to guarantor of the present invention
The range of shield, these all will not influence the effect and patent practicability that the present invention is implemented.
Claims (5)
1. a kind of method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting, it is characterised in that: including following
Step:
1) potassium alum is subjected to break process；
2) broken potassium alum is continuously transmitted into the primary air stream preheater of the first suspension roasting furnace system and is carried out tentatively
Dehydration preheating, tail gas empty after dust-extraction unit dedusting, and obtained potassium alum is transferred to two in the first suspension roasting furnace system
It is dry that secondary preheating is carried out in grade air-flow preheater；
3) potassium alum after second level preheating and drying is transferred to the first suspension roaster, and from suspension roaster combustion bottom burner
High-temperature gas is sufficiently mixed, and gas solid separation, isolated High Temperature Gas are collected and carried out by the first rotoclone collector of subsequent connection
Body is introduced into the secondary air flow preheater in the first suspension roasting furnace system, is re-introduced into primary air stream preheater；
4) level-one being delivered continuously to anhydrous potassium alum obtained in the first rotoclone collector in the second shower furnace roasting system
In air-flow preheater, enters back into the secondary air flow preheater in the second suspension furnace system and preheated, primary air stream preheater
For sulfur-containing tail gas after separation through dust-extraction unit dedusting, sulfur-containing tail gas obtains by-product sulfuric acid, ring through sulfuric acid catalysis absorption system again
Protect it is up to standard after be discharged in atmosphere through blower；
5) potassium alum after the secondary air flow preheater preheating of the second suspension roasting furnace system in step 4) is delivered continuously to the
It is anti-to be sufficiently mixed progress Roasting Decomposition with the high-temperature gas from the second suspension roaster combustion bottom burner for two suspension roasters
It answers, and the second suspension is introduced by the collection of the second rotoclone collector of subsequent connection and gas solid separation, isolated high-temperature gas
The secondary air flow preheater of roaster system, is re-introduced into primary air stream preheater；Material after the decomposition of second suspension roaster
After aerial cooler is cooling, the filter cake of potassium sulfate solution and aluminium oxide is obtained with water extraction solid-liquor separation, potassium sulfate is molten
Liquid condensing crystallizing obtains potassium product, and aluminium oxide filter cake obtains alumina product after drying；
6) air being heated in aerial cooler is blown into the first suspension roasting furnace system or the second suspension roasting with air blower
Burner in furnace system.
2. according to the method described in claim 1, it is characterized by: the broken partial size of potassium alum is less than 5mm in step 1).
3. according to the method described in claim 1, it is characterized by: in step 2 the first suspension roasting furnace system primary air stream
The secondary air flow preheater of preheating gas in preheater and secondary air flow preheater respectively from the first suspension roasting furnace system
With the first rotoclone collector, material is consistent with the high-temperature gas direction of motion in air-flow preheater；The exhaust temperature of emptying is 100-
200℃。
4. according to the method described in claim 1, it is characterized by: in step 3) the first suspension roaster roasting after anhydrous potassium
Alum water content < 0.5%, the potassium alum temperature for being transported to the second suspension roaster is 100-600 DEG C.
5. according to the method described in claim 1, it is characterized by: Roasting Decomposition reacts in the second suspension roaster in step 5)
Temperature is 800-1060 DEG C, reaction time 5-120s, and the direction of motion in furnace is consistent with material for high-temperature gas.
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Cited By (3)
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| CN112125325A (en) * | 2020-09-29 | 2020-12-25 | 福州大学 | Process for producing alumina by aluminosilicate mineral acid method |
| CN115676865A (en) * | 2022-09-14 | 2023-02-03 | 中铝矿业有限公司 | Device and method for reducing fuel consumption and nitrogen oxide emission of suspension roaster |
| CN116026160A (en) * | 2022-12-30 | 2023-04-28 | 青岛碱业钾肥科技有限公司 | System and method for utilizing smoke energy of Mannheim furnace |
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