CN109943713A - A kind of leaching method of lepidolite ore - Google Patents
A kind of leaching method of lepidolite ore Download PDFInfo
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- CN109943713A CN109943713A CN201910341941.4A CN201910341941A CN109943713A CN 109943713 A CN109943713 A CN 109943713A CN 201910341941 A CN201910341941 A CN 201910341941A CN 109943713 A CN109943713 A CN 109943713A
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Abstract
The invention belongs to ores to mention lithium technology field, and in particular to a kind of leaching method of lepidolite ore.The following steps are included: (1) Raw material processing；(2) potassium sulfate levigate in lepidolite concentrate powder and step (1), sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer are uniformly mixed by mixing in the ratio of setting；(3) it is granulated；The particle size of material reaches established standards and is conserved after granulation；(4) material after being granulated in step (3) is calcined in 850~1100 DEG C, obtains roasting clinker and is known as calcining；Calcination time is 30~240min；(5) calcining is transferred in heap bath unit and builds heap；(6) shower-bubble type agent on the mine heap that heap obtains is built to step (5) carry out heap leaching operations；(7) it collects.Sulfuric acid potassium application rate is greatly decreased in technical solution of the present invention, increases self-produced sodium sulphate dosage, reduces reagent cost, sulfating roasting technique is made to be provided with economy.
Description
Technical field
The invention belongs to ores to mention lithium technology field, and in particular to a kind of leaching method of lepidolite ore.
Background technique
Due to the development of electric car, demand of the lithium battery in world market is constantly soaring and causes the need to lithium carbonate
The amount of asking quickly rises, and how to develop and use various lithium resources and prepares lithium carbonate, meets the needs of market is to lithium carbonate, is pendulum at me
In face of urgent task.
Lithium mainly exists in the form of solid mineral resource and two kinds of liquid Mineral resource in nature, solid mineral resource
It is broadly divided into spodumene mineral and lepidolite mineral again.Chinese spodumene mineral resources compare shortage, and lepidolite is but very abundant, river
The Yichun Prefecture Xi Sheng lepidolite reserves are huge, and the reserves (in terms of lithia) of lithium are 257.8 ten thousand tons.In lepidolite also containing potassium,
A variety of valuable elements such as rubidium, caesium, fluorine, therefore lithium carbonate, and synthetical recovery valuable element are extracted by raw material of lepidolite, have wide
Wealthy market prospects and good economic benefit.
Lepidolite extracted lithium method mainly has acid system, alkaline process, salt method three categories.
Acid system generally needs preparatory high temperature defluorinate roasting to destroy micaceous structure mainly using sulfuric acid as leaching agent, or adds sulfuric acid roasting
It burns, then leaches again.In the presence of calcining defluorinate energy consumption is high, environmental pollution is big, sulfuric acid dosage is larger, leachate spent acid is high, neutralizes slag
The disadvantages of yield is big.
Alkaline process has traditional limestone sintering process, roasting defluorinate lime autoclaving method, the direct autoclaving method of milk of lime etc..Lime stone
Sintering process lepidolite ore per ton needs to admix 3.5 tons of lime stones, roasts at 950~1050 DEG C, and throughput is big, and energy consumption is high, leaching
Liquid lithium concentration is low out, and the leaching rate of lithium is not high；Lime autoclaving method liquid-solid ratio is big, and filtering is difficult with washing, and leachate lithium concentration is low,
The leaching rate of lithium is not high.
Salt method mixed with sulfate, chloride etc. and lepidolite after at high temperature calcination reaction mention lithium.The roasting of chlorate method
Generate chlorine, environmental pollution is big, equipment seriously corroded, and in lithium carbonate product chlorine root be easy it is exceeded.Traditional sulfate process
Potassium sulfate is generally used, expensive, reagent cost is high.
In other prior arts, patent CN102586587A discloses a kind of new method for handling lepidolite ore,
Lepidolite ore pass through 900 DEG C of high-temperature calcination defluorinates, then it is levigate after and lime and alkali metal salt mixing carry out autoclaving leaching, 150
Low pressure autoclaving 2 hours or so at DEG C, leaching rate Li90%, K80%, Rb70%.
Patent CN101736169A discloses a kind of method that defluorinate roasting villaumite autoclaving mentions lithium from lepidolite, exists first
900 DEG C of main calcining defluorinates, are added calcium oxide and the sodium chloride autoclaving in autoclave after levigate, which does not disclose lithium and rubidium
The leaching rate of potassium.
Patent CN103145158A discloses a kind of method that sulfuric acid roasting method lepidolite prepares lithium carbonate, first 900
DEG C main calcining defluorinate, it is then levigate with acid roasting, then by two sections of leachings, 96% or more the leaching rate of lithium.
But patent disclosed above is required to high-temperature calcination defluorinate and combines low temperature sulfuric acid baking or high pressure leaching again,
Process flow is long, and equipment investment is big, energy consumption is high, complicated for operation.
Patent CN1827527A discloses the method for a kind of lepidolite and sodium sulphate and calcium salt Roasting And Leaching lithium, specially lithium
Mica and CaSO4、CaF2、Na2SO4Mixing is roasted at 900~1100 DEG C, uses diluted acid leaching after calcining is levigate, this patent is best
Under the conditions of the leaching rate of lithium be 90.1%, in slag also containing 0.3% lithium, the leaching of rubidium caesium is in confused situation.Patent
CN85101989A discloses the method for a kind of lepidolite and potassium sulfate Roasting And Leaching lithium, specially 1 part of lepidolite and 0.5 part
K2SO4Mixing roasts at 950 DEG C, is gone out after calcining is levigate with water logging, lithium leaching rate 85.3~89.4%.
Traditional sulfating roasting method generally uses single potassium sulfate, or a small amount of sodium sulphate is mixed based on potassium sulfate,
Potassium sulfate is expensive, and reagent cost is high, thus industrial application value is not high.Sulfating roasting proposes lithium technique and seeks to the greatest extent at present
The dosage that amount reduces potassium sulfate increases the dosage of sodium sulphate, under the premise of guaranteeing lithium leaching rate, reduces the examination of potassium sulfate as far as possible
Agent cost, but after the dosage of increase sodium sulphate, calcining occurs sintering and even melts, and leads to not progress industrial operation, and rubidium
The leaching rate of caesium is very low.
Traditional technical solution needs to develop a kind of lithium cloud with industrial application value due to facing above-mentioned deficiency
The method that female sulfating roasting mentions lithium, to solve the above problems.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of leachings of economic, with industrial application value lepidolite ore
Method out.
In order to realize the purpose, the technical solution adopted by the present invention is that:
A kind of leaching method of lepidolite concentrate powder, comprising the following steps:
(1) Raw material processing
Potassium sulfate, sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer are milled down to setting degree；
(2) mixing
Lepidolite concentrate powder and potassium sulfate levigate in step (1), sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium are set
Agent is changed to be uniformly mixed in the ratio of setting:
Sulfuric acid potassium application rate is the 5~30% of lepidolite concentrate powder quality；
Sodium sulphate dosage is the 10~50% of lepidolite concentrate powder quality；
Gu fluorine and baked material raising agent are CaO, CaCO3、CaSO4One or more of mixture, dosage be lepidolite essence
The 5~15% of powdered ore quality；
Rubidium caesium displacer is sulfate, and dosage is the 2~10% of lepidolite concentrate powder quality；
(3) it is granulated
Above-mentioned material is granulated, water and the concentrated sulfuric acid is added in granulation process, and the additional amount of water is lepidolite concentrate silty
The 5~15% of amount, sulphuric acid are the 0~6% of lepidolite concentrate powder quality；The particle size of material reaches setting after granulation
Standard is simultaneously conserved；
(4) it calcines
Material after being granulated in step (3) is calcined in 850~1100 DEG C, roasting clinker is obtained and is known as calcining；When calcining
Between be 30~240min；
(5) heap is built
Calcining is transferred in heap bath unit and builds heap；
(6) dump leaching
Shower-bubble type agent on the mine heap that heap obtains is built to step (5) and carries out heap leaching operations, and leaching agent is that concentration is 0~50g/
The dilute sulfuric acid of L, temperature are 20~40 DEG C, and spraying intensity is 20~100L/m2·h；
(7) it collects
Dump leaching leachate is divided to two sections of collections by elution order, and first segment efflux is qualified leachate, and subsequent handling is gone to return
Receive lithium；Second segment efflux returns to makees granulation water and dump leaching spray-water next time.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (1), by potassium sulfate, sulfuric acid
Sodium, solid fluorine and calcining raising agent, rubidium caesium displacer are milled down to 90% less than 100 mesh.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (2), sulfuric acid potassium application rate is
The 10~20% of lepidolite concentrate powder quality；Sodium sulphate dosage is the 25~35% of lepidolite concentrate powder quality；Rubidium caesium displacer
For strontium sulfate.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (3), sulfuric acid in the concentrated sulfuric acid
Mass fraction be more than or equal to 92%.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (3), material after granulation
Particle size is 5~20mm, and conserves 4~8h.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (4), calcination temperature 900
~975 DEG C；Calcination time is 60~120min.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (5), build stack height be 3~
5m；Heap bath unit is one of dump leaching column, dump leaching tower, heap soaking pit.
Further, a kind of leaching method of lepidolite concentrate powder as described above in step (6), takes every spray 4h
Stop the intermittent mode spray of 2h, spray total Water is 1~3 times of lepidolite concentrate powder quality.
Further, a kind of leaching method of lepidolite concentrate powder as described above, in step (7), dump leaching leachate is pressed
Elution order is divided to two sections of collections, and the ratio of first segment effluent volume and lepidolite concentrate powder quality is 0.5~1.5L/kg；The
The ratio of two sections of effluent volumes and lepidolite concentrate powder quality is 0.5~1.5L/kg.
The beneficial effect of technical solution of the present invention is:
1, sulfuric acid potassium application rate is greatly decreased, increases self-produced sodium sulphate dosage, reduces reagent cost, make sulfating roasting
Technique is provided with economy.
2, CaO or CaCO is added3And be granulated, improve the sintering character of calcining, so that the calcining after increasing sodium sulphate dosage
Adhesion will not be melted, smooth can be discharged in commercial plant.CaCO3Addition so that calcining is loose porous, be suitable for that dump leaching is leached.
3, the leaching rate of traditional sulfating roasting technique rubidium caesium is very low, and the reagent that code name is A is added in the present invention, improves
The leaching rate of rubidium caesium.
4, it takes and banks up extract technology, reduce leaching equipment investment, eliminate filtering and washing operation, leach qualifying liquid
Small in size, lithium concentration is high.
5, the lepidolite concentrate of difficult mill is directly employed without levigate, and roasting material, which is taken, banks up extract technology without mill
Carefully, ore grinding energy consumption is greatly reduced.
Detailed description of the invention
Fig. 1 is the leaching method flow chart of lepidolite ore of the present invention.
Specific embodiment
Technical solution of the present invention is described in detail in the following with reference to the drawings and specific embodiments.
Technical solution of the present invention increases the dosage of the self-produced sodium sulphate of system, by adding by the dosage of reduction potassium sulfate
Enter CaO or CaCO3, and be granulated, improve the sintering character of calcining so that after increasing sodium sulphate dosage calcining will not melt it is viscous
Even, the purpose that the smooth discharging of ring formation is not easy in industrial rotary kiln device is realized.To baked material not pulverizing and jevigating, and hold its shape
Shape takes dump leaching mode to leach lithium, rubidium, reduces leaching equipment investment, eliminates filtering and washing operation.
Technical solution of the present invention lepidolite sulfate process proposes the principle of lithium: under the high temperature conditions, ion exchange reaction occurs,
Metal ion i.e. in additive occupies former lithium ion locations of structures, and lithium ion is detached from the aluminosilicate of slightly solubility
Soluble sulphate is formed, process flow chart is shown in figure one, and sulfating roasting reaction equation is as follows:
KLi2Al(Si4O11)(F,OH)2(lepidolite)+K2SO4→
KAlSiO4(kaliophilite)+KAlSi2O6(leucite)+Li2SO4+H2O+HF↑
Small amounts calcium or calcium carbonate is added, solid fluorine can be played the role of, while can also make to roast loose.
KLi2Al(Si4O11)(F,OH)2(lepidolite)+K2SO4+CaO→
KAlSiO4(kaliophilite)+KAlSi2O6(leucite)+Li2SO4+CaF2+H2O
According to operating procedure disclosed by the invention and related parameter, those skilled in the art can be according to the operation of this method
Principle achieves the object of the present invention, and is not limited to using equipment used in specific embodiment itself and its usage mode.
The following describes the present invention in detail with reference to examples.Embodiment has selected same lepidolite ore to carry out, certain
Lepidolite ore composition is shown in Table 1.
1 lepidolite ore composition of table
| Ingredient | Li2O | SiO2 | Al2O3 | K2O | Fe2O3 | MnO | F | Rb2O | Na2O |
| Content % | 3.17 | 48.1 | 23.5 | 7.9 | 3.2 | 0.44 | 4.5 | 1.03 | 0.89 |
As shown in Figure 1, a kind of leaching method of lepidolite concentrate powder of the present invention, comprising the following steps:
(1) Raw material processing
Potassium sulfate, sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer are milled down to 90% less than 100 mesh；
(2) mixing
Lepidolite concentrate powder and potassium sulfate levigate in step (1), sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium are set
Agent is changed to be uniformly mixed in the ratio of setting:
Sulfuric acid potassium application rate is 5~30%, preferably the 10~20% of lepidolite concentrate powder quality；
Sodium sulphate dosage is 10~50%, preferably the 25~35% of lepidolite concentrate powder quality；
Gu fluorine and baked material raising agent are CaO, CaCO3、CaSO4One or more of mixture, dosage be lepidolite essence
The 5~15% of powdered ore quality；
Rubidium caesium displacer is sulfate, preferably sulfuric acid strontium；Dosage is the 2~10% of lepidolite concentrate powder quality；
(3) it is granulated
Above-mentioned material is granulated, the concentrated sulfuric acid of water and mass fraction more than or equal to 92% is added in granulation process, water
Additional amount is the 5~15% of lepidolite concentrate powder quality, and sulphuric acid is the 0~6% of lepidolite concentrate powder quality；
The particle size of material is 5~20mm after granulation, conserves 4~8h.
(4) it calcines
Material after being granulated in step (3) is calcined in 850~1100 DEG C, roasting clinker is obtained and is known as calcining；When calcining
Between be 30~240min；
Preferred parameter is that calcination temperature is 900~975 DEG C；Calcination time is 60~120min.
(5) heap is built
Calcining is transferred in heap bath unit and builds heap；
(6) dump leaching
Shower-bubble type agent on the mine heap that heap obtains is built to step (5) and carries out heap leaching operations, and leaching agent is that concentration is 0~50g/
The dilute sulfuric acid of L, temperature are 20~40 DEG C, and spraying intensity is 20~100L/m2·h；
Every spray 4h is taken to stop the intermittent mode spray of 2h, spray total Water is 1~3 times of lepidolite concentrate powder quality.
(7) it collects
Dump leaching leachate is divided to two sections of collections, the ratio of first segment effluent volume and lepidolite concentrate powder quality by elution order
Example is 0.5~1.5L/kg, for qualified leachate, subsequent handling is gone to recycle lithium；Second segment effluent volume and lepidolite concentrate powder
The ratio of quality is 0.5~1.5L/kg, back to making granulation water and dump leaching spray-water next time.
It is the specific embodiment of above-mentioned technical proposal below.
Embodiment one
It is operated as follows:
1. taking 100kg lepidolite concentrate, following reagent: 20kg K is weighed2SO4、30kg Na2SO4、5kg CaO、
5kgCaCO3, 2kg rubidium caesium displacer, these reagents are mixed and finely ground to 90% less than 100 mesh；
2. lepidolite concentrate is uniformly mixed with levigate reagent, 8kg water is added, the 4kg concentrated sulfuric acid is made after mixing
Grain, granulation partial size are 6~20mm；
3. being roasted in rotary kiln to granulation material, 900 DEG C of temperature, calcining time 120min；
4. being then loaded into the dump leaching column of 200 × 5000mm of Φ, bed depth 4m；
5. shower-bubble type agent carries out heap leaching operations on mine heap, leaching agent is 50g/L sulfuric acid solution, and temperature is 25 DEG C, spray
Leaching intensity is 20L/m2H, every spray 4h stop 2h, and it is 300L that leaching agent, which sprays total amount,.
6. obtaining leachate 250L altogether, leachate presses elution order Fractional Collections, and first segment effluent volume is 100L, Li
Concentration 9.6g/L removes recycling lithium for qualified leachate；Second segment is poor leachate, and volume 150L partially returns to be granulated,
It is remaining to be used as to make shower water next time.
Leached mud 108.6kg contains Li 0.153%, Ru0.677, lithium leaching rate 88.8%, rubidium leaching rate 22.0%.
Embodiment two
It is operated as follows:
1. taking 100kg lepidolite concentrate, following reagent: 15kg K is weighed2SO4、35kg Na2SO4、3kg CaO、
7kgCaCO3, 5kg rubidium caesium displacer, these reagents are mixed and finely ground to 90% less than 100 mesh；
2. lepidolite concentrate is uniformly mixed with levigate reagent, the poor leachate mixing for adding 10L embodiment one is equal
It is granulated after even, granulation partial size is 6~20mm；
3. being roasted in rotary kiln to granulation material, 950 DEG C of temperature, calcining time 90min；
4. being then loaded into the dump leaching column of 200 × 5000mm of Φ, shower-bubble type agent carries out heap leaching operations on mine heap,
Leaching agent is 20g/L sulfuric acid solution, and temperature is 30 DEG C, spraying intensity 50L/m2H, every spray 4h stop 2h, leaching agent spray
Total amount is 250L.
5. obtaining leachate 200L altogether, leachate presses elution order Fractional Collections, and first segment effluent volume is 80L, Li
Concentration 11.8g/L removes recycling lithium for qualified leachate；Second segment is poor leachate, and volume 120L partially returns to be granulated,
It is remaining to be used as to make shower water next time.
Leached mud 106.5kg contains Li 0.162%, Ru0.512%, lithium leaching rate 88.4%, rubidium leaching rate 42.1%.
Embodiment three
It is operated as follows:
1. taking 1000kg lepidolite concentrate, following reagent: 100kg K is weighed2SO4、400kg Na2SO4、20kg CaO、
100kgCaCO3, 80kg rubidium caesium displacer, these reagents are mixed and finely ground to 90% less than 100 mesh；
2. lepidolite concentrate is uniformly mixed with levigate reagent, the poor leachate and 20kg of 120L embodiment one are added
The concentrated sulfuric acid is granulated after mixing, and granulation partial size is 6~20mm；
3. being roasted in rotary kiln to granulation material, 975 DEG C of temperature, calcining time 60min；
4. being then loaded into the dump leaching tower of 600 × 600 × 3200mm, shower-bubble type agent carries out dump leaching behaviour on mine heap
Make, leaching agent is 100g/L sulfuric acid solution, and temperature is 35 DEG C, spraying intensity 100L/m2H, every spray 4h stop 2h, leaching agent
Spray total amount is 2000L.
5. obtaining leachate 1500L altogether, leachate presses elution order Fractional Collections, and first segment effluent volume is 900L,
Li concentration 11.2g/L removes recycling lithium for qualified leachate；Second segment is poor leachate, and volume 600L partially returns to make
Grain, it is remaining to be used as to make shower water next time.
Leached mud 1053.4kg contains Li 0.178%, Ru0.453%, lithium leaching rate 87.4%, rubidium leaching rate 49.3%.
The above is presently preferred embodiments of the present invention, is not made any form of restriction to invention, of the invention
Technical spirit is to convert lepidolite ore phase using sulfating roasting, and dump leaching Leaching way is taken to dissolve out lithium, rubidium, all Yi Benfa
Bright technical spirit makees any simple modification, equivalent change and modification to above embodiments, belongs to the guarantor of technical solution of the present invention
Protect range.
Claims (10)
1. a kind of leaching method of lepidolite concentrate powder, which comprises the following steps:
(1) Raw material processing
Potassium sulfate, sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer are milled down to setting degree；
(2) mixing
By potassium sulfate levigate in lepidolite concentrate powder and step (1), sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer
It is uniformly mixed in the ratio of setting:
Sulfuric acid potassium application rate is the 5~30% of lepidolite concentrate powder quality；
Sodium sulphate dosage is the 10~50% of lepidolite concentrate powder quality；
Gu fluorine and baked material raising agent are CaO, CaCO3、CaSO4One or more of mixture, dosage be lepidolite concentrate powder
The 5~15% of quality；
Rubidium caesium displacer is sulfate, and dosage is the 2~10% of lepidolite concentrate powder quality；
(3) it is granulated
Above-mentioned material is granulated, water and the concentrated sulfuric acid is added in granulation process, and the additional amount of water is the 5 of lepidolite concentrate powder quality
~15%, sulphuric acid is the 0~6% of lepidolite concentrate powder quality；The particle size of material reaches established standards after granulation
And it is conserved；
(4) it calcines
Material after being granulated in step (3) is calcined in 850~1100 DEG C, roasting clinker is obtained and is known as calcining；Calcination time is
30~240min；
(5) heap is built
Calcining is transferred in heap bath unit and builds heap；
(6) dump leaching
Shower-bubble type agent on the mine heap that heap obtains is built to step (5) and carries out heap leaching operations, and leaching agent is that concentration is 0~50g/L
Dilute sulfuric acid, temperature are 20~40 DEG C, and spraying intensity is 20~100L/m2·h；
(7) it collects
Dump leaching leachate is divided to two sections of collections by elution order, and first segment efflux is qualified leachate, and subsequent handling is gone to recycle lithium；
Second segment efflux returns to makees granulation water and dump leaching spray-water next time.
2. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (1), by sulfuric acid
Potassium, sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer are milled down to 90% less than 100 mesh.
3. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (2), potassium sulfate
Dosage is the 10~20% of lepidolite concentrate powder quality；Sodium sulphate dosage is the 25~35% of lepidolite concentrate powder quality；Rubidium caesium
Displacer is strontium sulfate.
4. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (3), the concentrated sulfuric acid
The mass fraction of middle sulfuric acid is more than or equal to 92%.
5. a kind of leaching method of lepidolite concentrate powder as claimed in claim 4, it is characterised in that: in step (3), after granulation
The particle size of material is 5~20mm, and conserves 4~8h.
6. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (4), calcining temperature
Degree is 900~975 DEG C；Calcination time is 60~120min.
7. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (5), build heap height
Degree is 3~5m；Heap bath unit is one of dump leaching column, dump leaching tower, heap soaking pit.
8. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (6), take every
Spray 4h stops the intermittent mode spray of 2h, and spray total Water is 1~3 times of lepidolite concentrate powder quality.
9. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (7), dump leaching leaching
Liquid is divided to two sections of collections by elution order out, and the ratio of first segment effluent volume and lepidolite concentrate powder quality is 0.5~1.5L/
kg；The ratio of second segment effluent volume and lepidolite concentrate powder quality is 0.5~1.5L/kg.
10. a kind of leaching method of lepidolite concentrate powder as described in claim 1, it is characterised in that: in step (1), by sulphur
Sour potassium, sodium sulphate, solid fluorine and calcining raising agent, rubidium caesium displacer are milled down to 90% less than 100 mesh；
In step (2), sulfuric acid potassium application rate is the 10~20% of lepidolite concentrate powder quality；Sodium sulphate dosage is lepidolite concentrate powder
The 25~35% of quality；Rubidium caesium displacer is strontium sulfate；
In step (3), the mass fraction of sulfuric acid is more than or equal to 92% in the concentrated sulfuric acid；After granulation the particle size of material be 5~
20mm, and conserve 4~8h；
In step (4), calcination temperature is 900~975 DEG C；Calcination time is 60~120min；
In step (5), building stack height is 3~5m；Heap bath unit is one of dump leaching column, dump leaching tower, heap soaking pit；
In step (6), every spray 4h is taken to stop the intermittent mode spray of 2h, spray total Water is the 1 of lepidolite concentrate powder quality
~3 times；
Dump leaching leachate is divided to two sections of collections by elution order, and the ratio of first segment effluent volume and lepidolite concentrate powder quality is
0.5~1.5L/kg；The ratio of second segment effluent volume and lepidolite concentrate powder quality is 0.5~1.5L/kg.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110835679A (en) * | 2019-09-30 | 2020-02-25 | 山东瑞福锂业有限公司 | Method for preparing granular spodumene by granulating fine powder spodumene |
| CN110904343A (en) * | 2019-12-31 | 2020-03-24 | 江西南氏锂电新材料有限公司 | Method for extracting lithium by drying lepidolite by utilizing waste heat |
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| CN114436300A (en) * | 2022-01-14 | 2022-05-06 | 广东省科学院资源利用与稀土开发研究所 | Method for acidifying and leaching lithium by spodumene |
| CN115821060A (en) * | 2022-11-18 | 2023-03-21 | 宜丰国轩锂业有限公司 | Method for extracting lithium from lepidolite through composite salt method sectional roasting |
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