CN106498192B - A kind of method and system of revolving bed processing rare earth ore concentrate - Google Patents
A kind of method and system of revolving bed processing rare earth ore concentrate Download PDFInfo
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- CN106498192B CN106498192B CN201611147361.4A CN201611147361A CN106498192B CN 106498192 B CN106498192 B CN 106498192B CN 201611147361 A CN201611147361 A CN 201611147361A CN 106498192 B CN106498192 B CN 106498192B
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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
- C22B59/00—Obtaining rare earth metals
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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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- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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Abstract
The invention discloses the method and system that a kind of revolving bed handles rare earth ore concentrate, which is sequentially connected and is formed by proportioner, molding machine, drying unit, revolving bed calciner, ore grinding device, equipment for separating liquid from solid, leaching device.Using method and system in the present invention, rare earth ore concentrate caustic soda decomposition technique can be made to realize that serialization industrial production, low alkaline consumption improve economic benefit, environmental protection index is good.
Description
Technical field
The present invention relates to a kind of methods that rare earth metallurgy technical field more particularly to revolving bed handle rare earth ore concentrate.
Background technology
The rare earth reserves in China are first place in the world, however in explored Rare Earth Mine, mostly complicated component, content of rare earth
It is few, it is unfavorable for industrial directly application.Grade currently used for industrial mixed rare earth concentrates is 50%~60%, and
The content of rare earth of raw ore then be far below this level, therefore need to by rare-earth original ore gangue mineral and objectionable impurities ingredient effectively go
It removes, i.e., after ore dressing handles and obtains rare earth ore concentrate, then Extraction of rare earth.But the RE phosphate mine contained in mixed type rare-earth mineral
Object (monazite) is sufficiently stable under the high temperature conditions, is even more to be difficult to be decomposed with acid at normal temperatures, although existing sulfuric acid
Roasting and caustic soda decompose both methods technology maturation, and industrially widely apply, but there are disadvantages at environmentally friendly, energy saving aspect
End.
Calcination temperature generates largely generally between 600~800 DEG C containing fluorination when rare earth ore concentrate concentrated sulfuric acid high-temperature roasting
The highly acid exhaust gas and height of silicon, hydrogen fluoride, sulfur dioxide, sulfur trioxide etc. put waste residue, there is presently no economical and effective, be enterprise
The receptible processing method of institute, accumulates over a long period and increasingly can not be ignored to the harm that environment generates.
It is a kind of decomposition method of classics to decompose rare-earth mineral with caustic soda, soda processes decomposition mixed rare earth concentrate with it is solitary
Stone is identical, it is also desirable to make raw material with high-grade rare earth ore concentrate.Since no acidic pernicious gas generates in decomposable process, therefore need not
The waste gas treatment equipment of bulky complex, therefore this technique has been obtained for comparatively fast promoting.But due to the rise of caustic soda price, sternly
The economic benefit for affecting manufacturer of weight.That there is only amount of caustic soda is big for the technique, using drawbacks such as Batch Process modes,
And roasting process is generally phenomena such as rotary kiln or tunnel oven carry out, caking, fouling are susceptible in roasting process, to shadow
Ring roasting apparatus stable operation.If can overcome, above-mentioned amount of caustic soda is big, intermittent operation, sintering process are scarce without fouling ring formation etc.
Point, the technique will be real efficient, cleaning, comprehensive utilization of resources smelting processes.
Chinese patent ZL201010145840.9 discloses " a kind of liquid alkali roasting decomposition extraction process of mixed rare earth concentrates ",
A kind of new decomposition technique is proposed, rare earth ore concentrate is mixed with sodium hydroxide solution, the Roasting Decomposition in rotary kiln, after decomposition
Mineral synthesis Extraction of rare earth, thorium, fluorine, the resources such as phosphorus and calcium, technical process is without exhaust gas, waste residue.The key of the technology is rare earth
Roasting Decomposition process in rotary kiln after concentrate is mixed with sodium hydroxide solution.Moisture is quickly after entering rotary kiln due to slurry
Evaporation, Rare Earth Mine and sodium hydroxide form lump and ring formation in kiln hood low-temperature zone, and Rare Earth Mine and sodium hydroxide ring formation form hard
Block hardness is very high, and conventional blade structure design rotary kiln can not scrape off the ring formation of formation, make roasting that can not be carried out continuously.
Chinese patent CN102706141A discloses " a kind of process of preveting kiln ringing ", is to solve rare earth essence
Back material hole is arranged by the low-temperature zone in rotary kiln in the method for ring formation when mine sulfuric acid high-temperature roasting, this method, is arranged in high temperature section
Anti- material hole, back material hole are connected outside rotary kiln with conveying pipeline with anti-material hole, and the roasted ore part of high temperature section is made to return to low-temperature zone
Again roasting is participated in, has solved the problems, such as ring formation.But the above method is not applicable to the ring formation problem of Rare Earth Mine caustic soda Roasting Decomposition.
Chinese patent CN101824531 A disclose " a kind of liquid alkali low-temperature roasting decomposition process of caustic soda liquid of mixed rare earth concentrates ",
Including following procedure：(1) by mixed rare earth concentrates and sodium hydroxide by weight 1:0.5~1.5 is mixed；It (2) will mixing
Rare earth ore concentrate afterwards is roasted, 150 DEG C~550 DEG C of calcination temperature, roasting time 0.5~4 hour；(3) roasting is obtained
Roasted ore is washed to center；(4) the alkali cake dissolving with hydrochloric acid after washing controls pH=4~5, obtains re chloride；(5)
Extraction thorium and rare earth are sealed or further dissolve up for safekeeping after thorium enriched object washing after hydrochloric acid is molten.It is mixed using present invention processing dilute
Native concentrate, may be implemented the continuous production of caustic digestion mischmetal mine, and technical process realizes cleaning without exhaust gas and ammonia nitrogen waste water
Production and comprehensive utilization of resources.But above method base amount is excessively high, and sodium hydroxide concentration is up to the 50% of rare earth ore concentrate quality, very
To 150%.And caustic soda higher price, cause the technique productions cost to increase so that economic benefit is poor.
Invention content
Traditional rare earth concentrate caustic soda decomposition technique, needs a large amount of caustic soda, production cost is higher, deficiency in economic performance；Tradition roasting
It is easy caking, ring formation during firing technique, influences roasting apparatus and runs steadily in the long term；And flue dust is big in producing, exhaust gas is easily let out
Leakage, environmental pollution is serious, in order to overcome the above problem, and realizes the recycling of the resources such as valuable element rare earth, fluorine, phosphorus, the present invention
A kind of method of revolving bed processing rare earth ore concentrate is proposed, is included the following steps：
(1) rare earth ore concentrate, additive, binder are subjected to compounding, mixing according to weight ratio, obtain mixed material；
(2) mixed material is subjected to pelletizing, and sprays sodium hydroxide solution in balling process, rare earth green pellets is made；
(3) rare earth green pellets is dried, obtains rare earth dry bulb group；
(4) rare earth dry bulb is rolled into a ball and is roasted using revolving bed, obtain hot pelletizing；
(5) by hot pelletizing water quenching, wet grinding is carried out, ore pulp is obtained；
(6) by slurry filtration or suction filtration and washing is eluted, makes separation of solid and liquid, obtains filter residue and filtrate；
(7) filtrate is added excessive quick lime recycling fluorine, phosphorus, is obtained containing sodium hydroxide using causticization-concentration method processing
Solution reuses after concentrated purification in return to step (2) pellet forming process；
(8) filter residue after being separated by solid-liquid separation step (6) carries out dissolving leaching using hydrochloric acid, obtains earth solution and acidleach
Slag.
Further, the rare earth ore concentrate in step (1) is phosphate mineral rare earth ore concentrate, Fluoro-carbonate Minerals rare earth ore concentrate
Or the mixed rare earth concentrate containing monazite.The content of REO is 35% or more in rare earth ore concentrate；Rare earth ore concentrate granularity is preferably
0.074mm or less accounts for 60% or more.When REO is less than 35%, impurity content is excessively high in concentrate, the sodium hydroxide of required addition
More with additive amount, cost is higher, and impurity content is excessively high that low melting point can be caused excessive, to follow-up washing, acid
Dissolving extract technology makes troubles, and influences the permanently effective progress of production.
Further, step (1) rare earth ore concentrate, additive, binder weight batching ratio be 100:10-50:0.3-
5.Additive is mainly the solution or solids of sodium bicarbonate, sodium carbonate, preferably powdered sodium carbonate.Same REO contents it is dilute
In native concentrate, when additive amount deficiency, rare earth is easy to form Ca in roasting process8RE(PO4)5O2Compound, the product
Insoluble in acid, it will cause the reduction of follow-up acid dissolving extract technology middle rare earth total recovery.When additive amount is excessive, roasted
Sintering fusing is formed in journey, is on the one hand unfavorable for revolving bed discharging, is on the other hand increased the difficulty of follow-up ore grinding.
Binder is mainly in sodium humate, modified starch, sodium carboxymethylcellulose, pectin, guar gum, syrup, dextrin
Any one or more.Its additive amount, with mixed material can pelletizing be molded, and its intensity meets enough production needs (partly
Rice falls to 5mm steel plates, 5 times or more) minimum amount subject to.
Further, spray sodium hydroxide solution in step (2) balling process, sodium hydroxide solution mass concentration be containing
NaOH 30%-55%, calculating proportioning makes sodium hydroxide quality in pelletizing be the 4%-12% of rare earth ore concentrate quality.Hydrogen-oxygen at this
Change sodium solution largely to be supplemented through causticization-concentration by rear subsequent filtrate, when the sodium hydroxide solution amount or dense for returning to supplement
When degree is insufficient, it can be adjusted by addition adding sodium hydroxide.
Caustic soda reacts as follows with rare earth ore concentrate generation in roasting process：
REFCO3+ 3NaOH=RE (OH)3+NaF+Na2CO3
REPO4+ 3NaOH=RE (OH)3+Na3PO4
Th3(PO4)4+ 12NaOH=3Th (OH)4+4Na3PO4
The Na of generation2CO3Continue to react as follows with rare earth ore concentrate generation：
REFCO3+Na2CO3=RE2O3+2NaF+3CO2
2REPO4+3Na2CO3=RE2O3+2Na3PO4+3CO2
Th3(PO4)4+6Na2CO3=3ThO2+4Na3PO4+6CO2
In fact, generation coexists in above-mentioned reaction during caustic soda roasting rare earth concentrate.It can part generation so sodium carbonate is added
It is reacted for caustic soda.
Simultaneously as caustic soda can also occur to react as follows with the impurity in rare earth ore concentrate：
CaF2+ 2NaOH=Ca (OH)2+2NaF
Ca5F(PO4)3+ 10NaOH=5Ca (OH)2+NaF+3Na3PO4
It causes to rare earth ore concentrate grade requirement height in roasting process, and amount of caustic soda is excessive, if sodium carbonate is added,
It can replace caustic soda that following reaction occurs, reduce the consumption of caustic soda.
CaF2+Na2CO3=CaCO3+2NaF
Ca5F(PO4)3+5Na2CO3=5CaCO3+NaF+3Na3PO4
Pelletizing pelletizing grain size is 6mm-20mm.Pelletizing grain size is too small, influences revolving bed treating capacity；Pelletizing grain size is excessive, shadow
It rings pelletizing to be heated evenly, pelletizing outer layer has completely reacted, and pelletizing kernel may unreacted.
Further, it is 3% or less that the green pellets in step (3), which is dried to rare earth dry bulb group water content,.Rare earth dry bulb group
It is aqueous excessively high, pelletizing may be made in revolving bed internal fissure.Stoving process require drying course in CO2Isolation, drying temperature
It is 80 DEG C -200 DEG C.
Further, step (4) rotation bed structure is：Right over revolving bed ring-shaped furnace bottom, it has been evenly arranged radiant tube,
Using the closed radiant heating of radiant tube.It is preferred that radiant tube is gas fired radiant tubes, you can combustion gas body in radiant tube energy combustion heat release,
Carry out heat radiation.Fuel gas used can be the combustion gas such as blast furnace gas, coal gas etc. of low heat value, and preferred gas heating value is minimum
Up to 700~800 kilocalories.Radiant tube both ends are connected with heat storage, carry out heat storage type combustion heating, further decrease roasting technique
Energy consumption.
Revolving bed burner hearth is sealing structure, using airtight heating：Revolving bed material inlet is provided with helixes feed equipment, and adopts
Material inlet is sealed with feed method of piling；Revolving bed discharge port is directly connected to granulating unit, with prevent air from feed inlet,
Discharge port enters.In the lateral wall of annular furnace, nearly material inlet position is provided with flue outlet, and flue gas is exported by air-introduced machine, can
It is micro-positive pressure (such as 5pa~100pa) to adjust atmosphere in air-introduced machine power regulation burner hearth.
Revolving bed roasts system：Completely cut off air at a temperature of 700 DEG C -1100 DEG C and carry out anaerobic roasting, pelletizing is rotating
The residence time is 30-120min in bed.Temperature calcination temperature is too low, and calcination does not occur or reaction rate is slower.Roasting
Temperature is excessively high, promotes unobvious, and high energy consumption to calcination, also influences the long-term effective operation of equipment.Rare earth ore concentrate is revolving
Isolation air anaerobic roasting is carried out in rotated bed, is overcome previous rare earth roasting technique and is exposed to the shortcomings that being roasted in air, solves
Roasting process Ce2O3Easily it is oxidized to CeO2And the problem of being not easy by acid dissolving recycling, it is total to be conducive to raising subsequent technique rare earth
Yield.
Revolving bed roasting is different from the roasting of the other equipments such as rotary kiln, tunnel oven, and revolving bed is heated using radiant tube, no gas
Body is blown the disturbance to material bed generation, while material belongs to static heating, no material effect of seething, so roasting at bed bottom
Soot dust granule generates seldom in the process, can simplify or subtract follow-up complicated dust collecting process.Rare earth ore concentrate is in closed furnace body
Interior isolation air roasting, is different from previous open-heating technique, and furnace heat scatters and disappears less, is conducive to energy-saving.Simultaneously
The exhaust gas generated in roasting process is extracted out by air-introduced machine in closed furnace body, is then focused on, and exhaust gas will not be without more
It overflows in surrounding air, pollutes environment.Therefore, using revolving bed roasting technique, environmental protection index amount is good.
Further, after the hot pelletizing water quenching of step (5), wet grinding is carried out.A concentration of 45%- of ore pulp in grinding process
85%.Obtain ore pulp, the fineness of material is preferably that 0.074mm or less accounts for 70% or more in ore pulp.
Further, by slurry filtration or suction filtration and elute washing in step (6), make separation of solid and liquid, obtain filter residue and
Filtrate.After rare earth ore concentrate is fired, NaF, Na are generated3PO4、Na2CO3Etc. substance soluble easily in water, using the method for washing
Efficiently separate recycling.Slurry filtration (or filtering, press filtration) elution, washing to pH value is neutrality, and separation of solid and liquid obtains filtrate and filter
Slag.
Further, the filtrate in step (7) is using causticization-concentration method processing.Excessive quick lime is added in filtrate, by solution
In fluorine, phosphorus be fixed as indissoluble substance, be separated by solid-liquid separation recycling indissoluble substance, obtain the solution containing sodium hydroxide, solution is concentrated
After purification, returns and reused in pellet forming process.Preferably, sodium hydroxide is obtained after the concentrated purification of solution containing sodium hydroxide
A concentration of 30%-40% (mass ratio).
Further, dissolving with hydrochloric acid is added to leach above-mentioned filter residue in step (8).Using 6mol/L dissolving with hydrochloric acid, 60-80
DEG C constant temperature leaches, and finally obtains earth solution and acid leaching residue.
The present invention also provides the systems that a kind of revolving bed handles rare earth ore concentrate, including proportioner, molding machine, drying
Device, revolving bed calciner, ore grinding device, equipment for separating liquid from solid, leaching device, the system is by above-mentioned a variety of devices successively phase
Even form.
The present invention can make rare earth ore concentrate caustic soda decomposition technique realize that serialization industrial production, low alkaline consumption, economic benefit carry
Height, environmental protection index are good.
Description of the drawings
Fig. 1 is that the revolving bed of the present invention handles the method flow diagram of rare earth ore concentrate；
Fig. 2 is the system construction drawing of the processing rare earth ore concentrate of the present invention.
Specific implementation mode
For abundant disclosed purpose, below with reference to drawings and examples, the present invention is described in further detail.
Embodiment 1
As illustrated in fig. 1 and 2, by certain rare earth bulk concentrate (containing monazite), REO contents are 35wt% (weight %), and are added
Add agent sodium carbonate and binder sodium carboxymethylcellulose by weight proportion 100：10：0.3 is uniformly mixed in proportioner S100,
Mixture uses molding machine S200 pelletizings, and 55% sodium hydroxide solution is sprayed in balling process, and it is 8mm-12mm that grain size, which is made,
Rare earth green pellets, the mass ratio 10 of sodium hydroxide quality and rare earth ore concentrate in pelletizing:100.Pelletizing in drying unit S300,
To obtain aqueous 1% dry bulb group after 150 DEG C of drying.Dry bulb group is roasted using revolving bed calciner S400, roasting temperature
Degree is 1100 DEG C, and pelletizing residence time in revolving bed calciner S400 is 30min.Revolving bed is carried out using gas fired radiant tubes
Closed radiant heating.Hot pelletizing is sent directly into ore grinding device S500 and carries out water quenching and carry out wet type mill after water quenching after roasting
It selects, ore pulp a concentration of 45% in grinding process, it is the ore pulp that 0.074mm or less accounts for 70% or more to obtain fineness.Ore pulp is in solid-liquid
It is filtered, is eluted in separator S600, washing to pH value is neutrality.Excessive quick lime recycling fluorine, phosphorus is added in filtrate, and obtains
To the solution containing sodium hydroxide, NaOH concentration is 40% after the concentrated purification of solution, pellet forming process recycling is returned to, according to need
It is 55% to add appropriate sodium hydroxide adjustment solution NaOH concentration.Filter residue is carried out using hydrochloric acid in leaching device S700 complete molten
Solution leaches, and concentration of hydrochloric acid 6mol/L, 60 DEG C of constant temperature leach, and obtain re chloride and leached mud.Rare earth total recovery reaches
91.4%.
Embodiment 2
By certain rare earth ore concentrate (predominantly phosphate), REO contents are 58wt%, with Sodium Carbonate Additive and binder humic
Sour sodium by weight proportion 100：50：1 is uniformly mixed in proportioner S100, and mixture uses molding machine S200 pelletizings, makes
30% sodium hydroxide solution is sprayed during ball, is made the rare earth green pellets that grain size is 6mm-9mm, sodium hydroxide quality in pelletizing
With the mass ratio 4 of rare earth ore concentrate:100.Pelletizing is in drying unit S300, to obtain aqueous 2% dry bulb after 100 DEG C of drying
Group.Dry bulb group is roasted using revolving bed calciner S400, and calcination temperature is 900 DEG C, and pelletizing is in revolving bed calciner
The residence time is 90min in S400.Revolving bed carries out closed radiant heating using gas fired radiant tubes.Hot pelletizing is straight after roasting
It picks ore grinding device S500 to carry out water quenching and carry out wet type mill choosing after water quenching, ore pulp a concentration of 67% in grinding process obtains
It is the ore pulp that 0.074mm or less accounts for 85% or more to fineness.Ore pulp filters in equipment for separating liquid from solid S600, and elution, washing is extremely
PH is neutrality.Excessive quick lime recycling fluorine, phosphorus is added in filtrate, and obtains the solution containing sodium hydroxide, after the concentrated purification of solution
NaOH concentration is 30%, returns to pellet forming process recycling.Filter residue carries out fully dissolved leaching using hydrochloric acid in leaching device S700
Go out, concentration of hydrochloric acid 6mol/L, 80 DEG C of constant temperature leach, and obtain re chloride and leached mud.Rare earth total recovery is up to 97.4%.
Embodiment 3
By certain rare earth bulk concentrate (phosphate-containing and fluoro carbonate), REO contents are 65wt%, with Sodium Carbonate Additive and
Binder dextrin by weight proportion 100：30：3 are uniformly mixed in proportioner S100, and mixture is made using molding machine S200
Ball sprays 50% sodium hydroxide solution in balling process, is made the rare earth green pellets that grain size is 16mm-20mm, hydrogen-oxygen in pelletizing
Change the mass ratio 12 of sodium quality and rare earth ore concentrate:100.Pelletizing is aqueous to be obtained after 150 DEG C of drying in drying unit S300
1% dry bulb group.Dry bulb group is roasted using revolving bed calciner S400, and calcination temperature is 700 DEG C, and pelletizing is in revolving bed
The residence time is 120min in calciner S400.Revolving bed carries out closed radiant heating using gas fired radiant tubes.After roasting
Hot pelletizing is sent directly into ore grinding device S500 and carries out water quenching and carry out wet type mill choosing after water quenching, pulp density in grinding process
It is 70%, it is the ore pulp that 0.074mm or less accounts for 90% or more to obtain fineness.Ore pulp filters leaching in equipment for separating liquid from solid S600
It washes, washing to pH is neutrality.Excessive quick lime recycling fluorine, phosphorus is added in filtrate, and obtains the solution containing sodium hydroxide, and solution is through dense
NaOH concentration is 35% after contracting purification, returns to pellet forming process recycling, adds appropriate sodium hydroxide adjustment solution as needed
Containing 50%NaOH.Filter residue carries out fully dissolved leaching, concentration of hydrochloric acid 6mol/L, 80 DEG C of perseverances using hydrochloric acid in leaching device S700
Temperature leaches, and obtains re chloride and leached mud.Rare earth total recovery is up to 98.5%.
Embodiment 4
By certain rare earth ore concentrate (predominantly fluoro carbonate), REO contents are 53wt%, are changed with Sodium Carbonate Additive and binder
Property starch by weight proportion 100：20：5 are uniformly mixed in proportioner S100, and mixture uses molding machine S200 pelletizings,
40% sodium hydroxide solution is sprayed in balling process, and the rare earth green pellets that grain size is 10mm-14mm, sodium hydroxide in pelletizing is made
The mass ratio 8 of quality and rare earth ore concentrate:100.Pelletizing is in drying unit S300, to obtain aqueous 0.1% after 200 DEG C of drying
Dry bulb group.Dry bulb group is roasted using revolving bed calciner S400, and calcination temperature is 700 DEG C, and pelletizing is roasted in revolving bed
The residence time is 90min in device S400.Revolving bed carries out closed radiant heating using gas fired radiant tubes.Hot ball after roasting
Group is sent directly into ore grinding device S500 and carries out water quenching and carry out wet type mill choosing after water quenching, and ore pulp is a concentration of in grinding process
85%, it is the ore pulp that 0.074mm or less accounts for 98% or more to obtain fineness.Ore pulp filters elution in equipment for separating liquid from solid S600,
Washing is neutral to pH.Excessive quick lime recycling fluorine, phosphorus is added in filtrate, and obtains the solution containing sodium hydroxide, and solution is concentrated
NaOH concentration is 30% after purification, returns to pellet forming process recycling, adds appropriate sodium hydroxide adjustment solution as needed and contains
40%NaOH.Filter residue carries out fully dissolved leaching, concentration of hydrochloric acid 6mol/L, 80 DEG C of constant temperature using hydrochloric acid in leaching device S700
It leaches, obtains re chloride and leached mud.Rare earth total recovery is up to 96.9%.
Fig. 2 shows Fig. 1 to handle system used in the method for rare earth ore concentrate using revolving bed, by proportioner
S100, molding machine S200, drying unit S300, revolving bed calciner S400, ore grinding device S500, equipment for separating liquid from solid
S600, leaching device S700 are sequentially connected composition.
Wherein proportioner S100 is used to rare earth ore concentrate, additive, binder carrying out dispensing according to weight ratio, mix
Material, obtains mixed material；
Molding machine S200 is used to mixed material carrying out pelletizing, and sodium hydroxide solution is sprayed in balling process, makes
Obtain rare earth green pellets；
Drying unit S300 obtains rare earth dry bulb group for drying rare earth green pellets；
Revolving bed calciner S400 is used to roll into a ball rare earth dry bulb and be roasted using revolving bed, and hot pelletizing is obtained；
Rotation bed structure in wherein revolving bed calciner S400 is：Right over revolving bed ring-shaped furnace bottom, uniform cloth
It is equipped with radiant tube, closed radiant heating is carried out using radiant tube, preferably radiant tube is gas fired radiant tubes, you can combustion gas body is in spoke
Pipe energy combustion heat release is penetrated, heat radiation is carried out.Fuel gas used can be the combustion gas such as blast furnace gas, coal gas etc. of low heat value, excellent
Minimum reachable 700~800 kilocalories of gas heating value of choosing.Heat radiation tube both ends are connected with heat storage, carry out heat storage type combustion heating,
Further decrease the energy consumption of roasting technique.
Revolving bed burner hearth is sealing structure, using airtight heating：Revolving bed material inlet is provided with helixes feed equipment, uses
Feed method of piling is sealed material inlet；Revolving bed discharge port is directly connected to granulating unit, to prevent air from feed inlet, go out
Material mouth enters.In the lateral wall of annular furnace, nearly material inlet position is provided with flue outlet, and flue gas is exported by air-introduced machine, adjustable
Atmosphere is micro-positive pressure (5pa~100pa) in whole air-introduced machine power regulation burner hearth.
Ore grinding device S500 is used to, by hot pelletizing water quenching, carry out wet grinding, obtain ore pulp；
Equipment for separating liquid from solid S600 is used to by slurry filtration or suction filtration and elute washing, makes separation of solid and liquid, obtain filter residue with
Filtrate；Filtrate is added excessive quick lime recycling fluorine, phosphorus, is separated by solid-liquid separation recycling indissoluble substance, obtained using causticization-concentration method processing
To the solution containing sodium hydroxide, reused in return to step (2) described pellet forming process after concentrated purification；
Filter residue after leaching device S700 is used to step (6) being separated by solid-liquid separation carries out dissolving leaching using hydrochloric acid, obtains dilute
Native solution and acid leaching residue.
Therefore above example only expresses embodiments of the present invention, the description thereof is more specific and detailed, but can not be
And it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for those of ordinary skill in the art, not
Under the premise of being detached from present inventive concept, various modifications and improvements can be made, these are all within the scope of protection of the present invention.Cause
This, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. a kind of method of revolving bed processing rare earth ore concentrate, which is characterized in that include the following steps：
(1) rare earth ore concentrate, additive, binder are subjected to compounding, mixing according to weight ratio, obtain mixed material；
(2) by the mixed material pelletizing, and sodium hydroxide solution is sprayed in the balling process, rare earth green pellets is made；
(3) the rare earth green pellets is dried, obtains rare earth dry bulb group；
(4) the rare earth dry bulb is rolled into a ball and is roasted using revolving bed, obtain hot pelletizing；
(5) by the hot pelletizing water quenching, wet grinding is carried out, ore pulp is obtained；
(6) by the slurry filtration or suction filtration and washing is eluted, makes separation of solid and liquid, obtains filter residue and filtrate；
(7) filtrate is added excessive quick lime recycling fluorine, phosphorus, is obtained containing sodium hydroxide using causticization-concentration method processing
Solution reuses after concentrated purification in return to step (2) described pellet forming process；
(8) filter residue after being separated by solid-liquid separation step (6) carries out dissolving leaching using hydrochloric acid, obtains earth solution and acidleach
Slag；
The additive is sodium bicarbonate or sodium carbonate.
2. the method for revolving bed processing rare earth ore concentrate as described in claim 1, which is characterized in that wherein described in step (1)
Rare earth ore concentrate is in phosphate mineral rare earth ore concentrate, Fluoro-carbonate Minerals rare earth ore concentrate or mixed rare earth concentrate containing monazite
One or more.
3. the method for revolving bed processing rare earth ore concentrate as described in claim 1, which is characterized in that wherein ore grinding in step (5)
Pulp density is 45%-85% in the process, and the fineness of material is that 0.074mm or less accounts for 70% or more in the obtained ore pulp.
4. the method for revolving bed processing rare earth ore concentrate as described in claim 1, which is characterized in that wherein described in step (1)
Rare earth ore concentrate, additive, binder weight batching ratio be 100:10-50:0.3-5.
5. the method for revolving bed processing rare earth ore concentrate as described in claim 1, which is characterized in that wherein described in step (2)
Sodium hydroxide solution mass concentration is 30%-55%.
6. the method for revolving bed processing rare earth ore concentrate as described in claim 1, which is characterized in that wherein described in step (3)
In drying course with CO2Isolation, the drying temperature are 80 DEG C -200 DEG C.
7. the method for revolving bed processing rare earth ore concentrate as described in claim 1, which is characterized in that in the wherein described step (7)
The mass concentration that sodium hydroxide is obtained after the concentrated purification of solution containing sodium hydroxide is 30%-40%.
8. the system that a kind of method using described in aforementioned any claim handles rare earth ore concentrate, which is characterized in that the system
System is by proportioner, molding machine, drying unit, revolving bed calciner, ore grinding device, equipment for separating liquid from solid, leaching device
It is sequentially connected composition.
9. the system of processing rare earth ore concentrate as claimed in claim 8, which is characterized in that revolving bed described in the step (4)
Structure is：Right over the revolving bed ring-shaped furnace bottom, it is evenly arranged gas fired radiant tubes.
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