CN107739847A - A kind of crystal formation conversion method of natural spodumene suspension roasting - Google Patents
A kind of crystal formation conversion method of natural spodumene suspension roasting Download PDFInfo
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- CN107739847A CN107739847A CN201710956672.3A CN201710956672A CN107739847A CN 107739847 A CN107739847 A CN 107739847A CN 201710956672 A CN201710956672 A CN 201710956672A CN 107739847 A CN107739847 A CN 107739847A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/10—Obtaining alkali metals
- C22B26/12—Obtaining lithium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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Abstract
The invention provides a kind of crystal formation conversion method of natural spodumene suspension roasting, it is after natural α spodumenes are milled down into certain particle diameter, put into two level suspension roaster and carry out fluidized drying preheating, then by the spodumene powder after preheating successively through two level rotoclone collector, after deduster gas solid separation, put into first stage suspension roaster, suspension roasting is carried out using high-temperature gas, stone flour is set to carry out preliminary crystal formation conversion, again after the separation of one cyclonic deduster, gained High-temperature mineral powder is completed to crystal formation conversion in heat insulation tank, finally it is transferred in cooler and cools down, obtain beta spodumene.The present invention is calcined using suspension roasting bed, have the advantages that equipment is simple, equipment investment is few, energy consumption is low, treating capacity is big, crystalline substance turn temperature is easily controllable, crystal formation change it is more complete.
Description
Technical field
The present invention relates to a kind of ore to put forward lithium technical field, and more specifically a kind of crystal formation of natural spodumene suspension roasting turns
Change method.
Background technology
Lithium and lithium salts expand to aluminium lithium via traditional application field such as glass ceramics, electrolytic aluminium, lubricating grease, refrigeration etc.
The high-technology fields such as alloy, lithium battery, nuclear fusion, particularly new energy need for efficient battery explosion type that may be present
Growth is asked, the technological progress to lithium salts industry proposes urgent challenge, studies new lithium minerals and puies forward lithium technology to the new energy in the world
The development tool in source is of great significance.
Natural spodumene is generally required by high temperature to be transformed into β types from α type crystal formations and could carry out follow-up lithium and extracted, tradition
For method using the difficult control of rotary kiln baking temperature, equipment is huge, and disposal ability is limited, and high energy consumption, and cost is high, brilliant in industry to turn
Rate is usually no more than 97%；Using fluiddized-bed roasting technique, have disposal ability big, be heated in bed required for crystalline substance turns temperature
Time it is short, but fluid unit is very huge, and because fluidized-bed layer area is big, temperature control difficulty is big, and crystalline substance turns temperature
Melting temperature close to spodumene and impurity is also easy to produce local overheating, partial melting phenomenon and then influences brilliant turn of operation.And outstanding
In floating stove, it is only necessary to the crystalline substance required for several seconds can is heated to turns temperature, relative to fluid bed bed more uniform temperature, and it is outstanding
Floating furnace temperature control is more accurate, typically can be controlled in the range of 10 DEG C.Therefore, the present invention proposes a kind of using shower furnace roasting
The method for carrying out crystal formation conversion, it is changed a job with traditional rotary kiln baking crystalline substance compared with skill and fluiddized-bed roasting, has that equipment is simple, sets
Standby small investment, energy consumption is low, treating capacity is big, crystalline substance turns the advantages that temperature is easily controllable, crystal formation conversion is more complete.
The content of the invention
The invention provides a kind of crystal formation conversion method of natural spodumene suspension roasting, rotary kiln baking crystalline substance is which overcomed
The problem of equipment is huge in skill of changing a job, temperature control is difficult；Distribution device in gas-fluid and wind need to be used when overcoming fluiddized-bed roasting again
Cap, and fluid bed fluidisation distributed controll is difficult, equipment relatively bulky complex the shortcomings of, have that equipment is simple, equipment investment is few, energy
Consume that low, treating capacity is big, crystalline substance turns the advantages that temperature is easily controllable, crystal formation conversion is more complete.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of crystal formation conversion method of natural spodumene suspension roasting, it comprises the following steps：
1）Water content is less than into 30%, natural α-spodumene of the oxidation lithium content more than 0.5% to be finely ground to average diameter and be less than 0.2mm
Spodumene powder；
2）Gained spodumene powder is put into two level suspension roaster, utilizes the high temperature tail isolated in one cyclonic dust-precipitator
Gas carries out fluidized drying preheating, the temperature of spodumene powder is less than 2% up to 150-700 DEG C, water content, then by drying and preheating
Rear spodumene powder and high-temperature tail gas are passed through two level rotoclone collector and carry out gas solid separation, separating obtained tail gas removing dust device gas again
Gu after separation, the preheating stone flour that the preheating stone flour of collection separates with two level rotoclone collector is introduced together into first stage suspension roasting
In stove, air is discharged into through blower fan after remainder of exhaust gas dedusting is up to standard；
3）By step 2）In the preheating stone flour collected by two level rotoclone collector and deduster put into first stage suspension roaster,
Mixed rapidly with 1000-1150 DEG C of the high-temperature gas obtained in first stage suspension roaster base burning room（High-temperature gas flows
Direction is passed through that direction is consistent, and its gas empty bed speed is 1-4 m/s with stone flour）, stone flour is heated rapidly to 950-1100 DEG C, it is preliminary brilliant
Type conversion process 1-4s；
4）The one cyclonic being connected with first stage suspension roaster will be entered with high-temperature gas through the stone flour that preliminary crystal formation is changed
Gas solid separation is completed in dust-precipitator, the temperature of the high-temperature tail gas of separation is 950-1100 DEG C, is returned it into step 2）Two level is hanged
It is used for the drying and preheating of spodumene powder in floating roaster；950-1100 DEG C isolated of High-temperature mineral powder is passed through 900-1050 DEG C
Heat insulation tank in, after storage 10-120min carries out further crystal formation conversion, then be transferred in cooler, cooled down through multi-staged air
To less than 200 DEG C, β-spodumene is obtained；The air themperature discharged in cooling procedure is 250-500 DEG C, as combustion air
It is incorporated into first stage suspension roaster, with fuel co-fire.
The remarkable advantage of the present invention is：
（1）Present invention firstly provides spodumene ore deposit is levigate rear using suspension roasting progress crystal formation conversion.Wherein, spodumene is ground
After thin, be advantageous to faster conduct heat, the time so as to change crystal formation greatly shortens；And suspension roasting augmentation of heat transfer is used,
Its temperature control is more accurate, and device efficiency height, reduced investment, energy utilization rate are higher, and particularly first stage suspension roasting reaches brilliant and turned
Temperature only needs the several seconds, and is up to the brilliant spodumene for turning temperature sufficient dwell time in heat insulation tank, it can be ensured that and crystalline substance turns complete,
Its brilliant rate of rotation is more than 97%.
（2）Energy is easy to comprehensive reutilization during brilliant turn of the invention, and energy consumption is lower, and brilliant turn of relatively conventional rotary kiln can
Save the energy more than 40%.
（3）The present invention carries out brilliant turn using shower furnace, and more compact with respect to fluid unit, equipment takes up an area small, unit production capacity
Equipment investment it is lower, and spodumene residence time in suspension bed is shorter, is not likely to produce material melts caused by local overheating.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of suspension roasting of the present invention, wherein, 1- two level suspension roasters；2- two level cyclone dust collections
Device；3- first stage suspension roasters；4- one cyclonic dust-precipitators；5- heat insulation tanks；6- coolers；7- dedusters.
Embodiment
As shown in figure 1, a kind of crystal formation conversion method of natural spodumene suspension roasting of the present invention comprises the following steps：
1）Water content is less than into 30%, natural α-spodumene of the oxidation lithium content more than 0.5% to be finely ground to average diameter and be less than 0.2mm
Spodumene powder；
2）Gained spodumene powder is put into two level suspension roaster 1, utilizes the high temperature isolated in one cyclonic dust-precipitator 4
Tail gas carries out fluidized drying preheating, the temperature of spodumene powder is less than 2% up to 150-700 DEG C, water content, then will dry pre-
Spodumene powder after heat and high-temperature tail gas are passed through two level rotoclone collector 2 and carry out gas solid separation, separating obtained tail gas removing dust again
After the gas solid separation of device 7, preheating stone flour that the preheating stone flour of collection separates with two level rotoclone collector 2 is introduced together into one-level and hanged
In floating roaster 3, air is discharged into through blower fan after remainder of exhaust gas dedusting is up to standard；
3）By step 2）In the preheating stone flour collected by two level rotoclone collector 2 and deduster 7 put into first stage suspension roaster 3
It is interior, mixed rapidly with 1000-1150 DEG C of the high-temperature gas obtained in the base burning room of first stage suspension roaster 3（High-temperature gas
Flow direction is passed through that direction is consistent, and its gas empty bed speed is 1-4 m/s with stone flour）, stone flour is heated rapidly to 950-1100 DEG C, just
Walk crystal formation conversion process 1-4s；
4）The one cyclonic being connected with first stage suspension roaster 3 will be entered with high-temperature gas through the stone flour that preliminary crystal formation is changed
Gas solid separation is completed in dust-precipitator 4, the temperature of the high-temperature tail gas of separation is 950-1100 DEG C, is returned it into step 2）Two level is hanged
It is used for the drying and preheating of spodumene powder in floating roaster 1；950-1100 DEG C isolated of High-temperature mineral powder is passed through 900-1050
DEG C heat insulation tank 5 in, after storage 10-120min carries out further crystal formation conversion, then be transferred in cooler 6, through multi-staged air
Less than 200 DEG C are cooled to, obtains β-spodumene；The air themperature discharged in cooling procedure is 250-500 DEG C, as combustion-supporting
Air is incorporated into first stage suspension roaster 3, with fuel co-fire.
In order that content of the present invention easily facilitates understanding, with reference to embodiment to of the present invention
Technical scheme is described further, but the present invention is not limited only to this.
Embodiment 1：
By natural α-spodumene（Aoxidize lithium content 1.5%）It is finely ground to average diameter 0.15mm spodumene powder；Then put into
Into two level suspension roaster, it is pre- to carry out fluidized drying using the 950 DEG C of high-temperature tail gas isolated in one cyclonic dust-precipitator
Heat, the temperature of spodumene powder is set to be less than 2% up to 150 DEG C, water content, then by the spodumene powder and high-temperature tail gas after drying and preheating
It is passed through two level rotoclone collector and carries out gas solid separation, separating obtained tail gas is again after removing dust device gas solid separation, the preheating stone of collection
The preheating stone flour that powder separates with two level rotoclone collector is introduced together into first stage suspension roaster, with first stage suspension roaster
1000 DEG C of the high-temperature gas that bottom combustion chamber obtains mixes rapidly（High-temperature gas flows direction and stone flour, and to be passed through direction consistent,
Its gas empty bed speed is 4 m/s）, stone flour is heated rapidly to 950 DEG C, preliminary crystal formation conversion process 1s；Then will be through preliminary crystal formation
The stone flour of conversion enters with high-temperature gas completes gas-solid point in the one cyclonic dust-precipitator being connected with first stage suspension roaster
From isolated 950 DEG C of High-temperature mineral powder is passed through in 900 DEG C of heat insulation tank, and storage 120min carries out further crystal formation conversion
Afterwards, then it is transferred in cooler, cools down to obtain β-spodumene through multi-staged air；The air themperature discharged in cooling procedure is 250
DEG C, it is combustion-supporting to be introduced into bottom in first stage suspension roaster.The brilliant rate of rotation of β-spodumene is 97%.
Embodiment 2：
By natural α-spodumene（Aoxidize lithium content 2.4%）It is finely ground to average diameter 0.1mm spodumene powder；Then put into
Into two level suspension roaster, it is pre- to carry out fluidized drying using the 1100 DEG C of high-temperature tail gas isolated in one cyclonic dust-precipitator
Heat, the temperature of spodumene powder is set to be less than 2% up to 400 DEG C, water content, then by the spodumene powder and high-temperature tail gas after drying and preheating
It is passed through two level rotoclone collector and carries out gas solid separation, separating obtained tail gas is again after removing dust device gas solid separation, the preheating stone of collection
The preheating stone flour that powder separates with two level rotoclone collector is introduced together into first stage suspension roaster, with first stage suspension roaster
1100 DEG C of the high-temperature gas that bottom combustion chamber obtains mixes rapidly（High-temperature gas flows direction and stone flour, and to be passed through direction consistent,
Its gas empty bed speed is 3 m/s）, stone flour is heated rapidly to 1000 DEG C, preliminary crystal formation conversion process 2s；Then will be through preliminary crystal formation
The stone flour of conversion enters with high-temperature gas completes gas-solid point in the one cyclonic dust-precipitator being connected with first stage suspension roaster
From isolated 950 DEG C of High-temperature mineral powder is passed through in 950 DEG C of heat insulation tank, and storage 60min carries out further crystal formation conversion
Afterwards, then it is transferred in cooler, cools down to obtain β-spodumene through multi-staged air；The air themperature discharged in cooling procedure is 350
DEG C, it is combustion-supporting to be introduced into bottom in first stage suspension roaster.The brilliant rate of rotation of β-spodumene is 99%.
Embodiment 3：
By natural α-spodumene（Aoxidize lithium content 4.3%）It is finely ground to average diameter 0.06mm spodumene powder；Then put into
Into two level suspension roaster, it is pre- to carry out fluidized drying using the 1000 DEG C of high-temperature tail gas isolated in one cyclonic dust-precipitator
Heat, the temperature of spodumene powder is set to be less than 2% up to 200 DEG C, water content, then by the spodumene powder and high-temperature tail gas after drying and preheating
It is passed through two level rotoclone collector and carries out gas solid separation, separating obtained tail gas is again after removing dust device gas solid separation, the preheating stone of collection
The preheating stone flour that powder separates with two level rotoclone collector is introduced together into first stage suspension roaster, with first stage suspension roaster
1150 DEG C of the high-temperature gas that bottom combustion chamber obtains mixes rapidly（High-temperature gas flows direction and stone flour, and to be passed through direction consistent,
Its gas empty bed speed is 1 m/s）, stone flour is heated rapidly to 1100 DEG C, preliminary crystal formation conversion process 3s；Then will be through preliminary crystal formation
The stone flour of conversion enters with high-temperature gas completes gas-solid point in the one cyclonic dust-precipitator being connected with first stage suspension roaster
From isolated 1100 DEG C of High-temperature mineral powder is passed through in 1000 DEG C of heat insulation tank, and storage 20min carries out further crystal formation conversion
Afterwards, then it is transferred in cooler, cools down to obtain β-spodumene through multi-staged air；The air themperature discharged in cooling procedure is 250
DEG C, it is combustion-supporting to be introduced into bottom in first stage suspension roaster.The brilliant rate of rotation of β-spodumene is 99%.
Embodiment 4：
By natural α-spodumene（Aoxidize lithium content 0.5%）It is finely ground to average diameter 0.04mm spodumene powder；Then put into
Into two level suspension roaster, it is pre- to carry out fluidized drying using the 1100 DEG C of high-temperature tail gas isolated in one cyclonic dust-precipitator
Heat, the temperature of spodumene powder is set to be less than 2% up to 700 DEG C, water content, then by the spodumene powder and high-temperature tail gas after drying and preheating
It is passed through two level rotoclone collector and carries out gas solid separation, separating obtained tail gas removing dust device gas solid separation again, the preheating stone flour of collection
The preheating stone flour separated with two level rotoclone collector is introduced together into first stage suspension roaster, with first stage suspension roaster bottom
1000 DEG C of the high-temperature gas that portion combustion chamber obtains mixes rapidly（High-temperature gas flows direction and stone flour, and to be passed through direction consistent, its
Gas empty bed speed is 2 m/s）, stone flour is heated rapidly to 950 DEG C, preliminary crystal formation conversion process 4s；Then will turn through preliminary crystal formation
The stone flour changed enters in the one cyclonic dust-precipitator being connected with first stage suspension roaster with high-temperature gas completes gas solid separation,
950 DEG C isolated of High-temperature mineral powder is passed through in 1050 DEG C of heat insulation tank, after storage 10min carries out further crystal formation conversion,
It is transferred to again in cooler, cools down to obtain β-spodumene through multi-staged air；The air themperature discharged in cooling procedure is 500 DEG C,
It is combustion-supporting to be introduced into bottom in first stage suspension roaster.The brilliant rate of rotation of β-spodumene is 99%.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (7)
- A kind of 1. crystal formation conversion method of natural spodumene suspension roasting, it is characterised in that：Comprise the following steps：1）Natural α-spodumene is levigate, obtain the spodumene powder of certain particle diameter；2）Gained spodumene powder is put into two level suspension roaster, utilizes the high temperature tail isolated in one cyclonic dust-precipitator Gas carries out fluidized drying preheating, and the spodumene powder after drying and preheating then is passed through into two level rotoclone collector with high-temperature tail gas and entered Row gas solid separation, separating obtained tail gas is after removing dust device carries out gas solid separation again, the preheating stone flour of collection and two level cyclone dust collection The preheating stone flour separated in device is concomitantly introduced into first stage suspension roaster, and air is discharged into through blower fan after remainder of exhaust gas dedusting is up to standard；3）By step 2）The preheating stone flour and the high-temperature gas in first stage suspension roaster being incorporated into first stage suspension roaster are fast Speed mixing, makes stone flour carry out preliminary crystal formation conversion under certain temperature and time；4）The one cyclonic being connected with first stage suspension roaster will be entered with high-temperature gas through the stone flour that preliminary crystal formation is changed Gas solid separation, isolated high-temperature tail gas return to step 2 are completed in dust-precipitator）It is used for spodumene powder in two level suspension roaster Drying and preheating, isolated High-temperature mineral powder is passed through in heat insulation tank, and insulation storage certain time carries out further crystal formation conversion Afterwards, then progress multi-staged air cooling in cooler is passed through, obtains β-spodumene miberal powder.
- 2. the crystal formation conversion method of natural spodumene suspension roasting according to claim 1, it is characterised in that：Step 1）In The water content of natural α-spodumene is less than 30%, and the content of lithia is more than 0.5%；The average diameter of gained spodumene powder is less than 0.2mm。
- 3. the crystal formation conversion method of natural spodumene suspension roasting according to claim 1, it is characterised in that：Step 2）It is dry Spodumene powder after dry preheating for 150-700 DEG C, water content is less than 2%.
- 4. the crystal formation conversion method of natural spodumene suspension roasting according to claim 1, it is characterised in that：Step 3） The temperature of high temperature gas is 1000-1150 DEG C, and its gas empty bed speed is 1-4 m/s；The temperature that preliminary crystal formation is changed is 950- 1100 DEG C, time 1-4s.
- 5. the crystal formation conversion method of natural spodumene suspension roasting according to claim 1, it is characterised in that：Step 4）One The temperature for the high-temperature tail gas isolated in level rotoclone collector is 950-1100 DEG C, and the high temperature stone flour temperature isolated is 950- 1100℃。
- 6. the crystal formation conversion method of natural spodumene suspension roasting according to claim 1, it is characterised in that：Step 4）In The temperature of heat insulation tank is 900-1050 DEG C, and the residence time that crystal formation is changed in heat insulation tank is 10-120min.
- 7. the crystal formation conversion method of natural spodumene suspension roasting according to claim 1, it is characterised in that：Step 4）It is cold But the air themperature discharged during is 250-500 DEG C, is introduced into first stage suspension roaster and fuel co-fire.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110510647A (en) * | 2019-09-24 | 2019-11-29 | 福州大学 | The method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting |
| CN111439762A (en) * | 2020-03-16 | 2020-07-24 | 东北大学 | Method for extracting lithium by suspension roasting of spodumene concentrate |
| CN112619856A (en) * | 2021-01-05 | 2021-04-09 | 宁都县赣锋锂业有限公司 | Spodumene roasting material crushing device and method |
| CN113023739A (en) * | 2021-03-17 | 2021-06-25 | 合肥水泥研究设计院有限公司 | Spodumene powder suspension preheating calcination crystal form conversion process |
| CN113493211A (en) * | 2021-05-24 | 2021-10-12 | 合肥水泥研究设计院有限公司 | Spodumene concentrate suspension drying calcination transformation process |
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| CN104058435A (en) * | 2014-06-05 | 2014-09-24 | 鞠复勇 | Equipment and method for calcining alpha aluminum oxide by using aluminum oxide gaseous suspension calciner |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110510647A (en) * | 2019-09-24 | 2019-11-29 | 福州大学 | The method that production aluminium oxide, potassium sulfate and sulfuric acid are decomposed in potassium alum suspension roasting |
| CN111439762A (en) * | 2020-03-16 | 2020-07-24 | 东北大学 | Method for extracting lithium by suspension roasting of spodumene concentrate |
| CN114349031A (en) * | 2020-03-16 | 2022-04-15 | 东北大学 | Suspension roasting method for spodumene concentrate and method for extracting lithium by suspension roasting of spodumene concentrate |
| CN112619856A (en) * | 2021-01-05 | 2021-04-09 | 宁都县赣锋锂业有限公司 | Spodumene roasting material crushing device and method |
| CN113023739A (en) * | 2021-03-17 | 2021-06-25 | 合肥水泥研究设计院有限公司 | Spodumene powder suspension preheating calcination crystal form conversion process |
| CN113493211A (en) * | 2021-05-24 | 2021-10-12 | 合肥水泥研究设计院有限公司 | Spodumene concentrate suspension drying calcination transformation process |
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