CN106755968B - A kind of method of revolving bed processing rare earth ore concentrate - Google Patents

A kind of method of revolving bed processing rare earth ore concentrate Download PDF

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Publication number
CN106755968B
CN106755968B CN201611149595.2A CN201611149595A CN106755968B CN 106755968 B CN106755968 B CN 106755968B CN 201611149595 A CN201611149595 A CN 201611149595A CN 106755968 B CN106755968 B CN 106755968B
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rare earth
revolving bed
ore concentrate
earth ore
pelletizing
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CN106755968A (en
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陈文亮
刘占华
王欣
王岩
薛逊
丁银贵
左晓鹏
吴道洪
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Jiangsu Province Metallurgical Design Institute Co Ltd
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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
    • C22B1/08—Chloridising roasting
    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a kind of method of revolving bed processing rare earth ore concentrate, including step：By rare earth ore concentrate, sodium carbonate, chlorinating agent, binding agent according to part by weight carry out dispensing, stir and evenly mix, obtain mixed material；Mixed material is subjected to pelletizing shaping, aqueous green pellets is made；Aqueous green pellets is dried or dried, obtains rare earth dry bulb group；Rare earth dry bulb is rolled into a ball and is calcined using revolving bed, obtains hot pelletizing；By hot pelletizing water quenching, add calcium chloride and carry out wet grinding, obtain ore pulp；By slurry filtration or suction filtration and washing is eluted, makes separation of solid and liquid, obtains filter residue and re chloride.Roasting process is without largely using alkali in the method for the present invention, and product of roasting Extraction of rare earth directly can add water logging to go out, and without introducing acid, alkali, its cost is low, good in economic efficiency, environmental protection index is good.In addition, the invention further relates to a kind of system that rare earth ore concentrate is handled using this method.

Description

A kind of method of revolving bed processing rare earth ore concentrate
Technical field
Revolving bed is utilized the present invention relates to the method for the Extraction of rare earth from rare earth ore concentrate, and more particularly, to one kind The method that the product of roasting of roasting directly washes Extraction of rare earth.
Background technology
The rare earth reserves in China are first place in the world, but in explored Rare Earth Mine, most of all complicated component, rare earths Content is few, is unfavorable for industrial directly application.Content of rare earth currently used for industrial mixed rare earth concentrates is generally 50%- 60%, and the content of rare earth of raw ore is then far below this level, therefore need to be by the gangue mineral in rare-earth original ore and objectionable impurities composition Effectively remove, i.e., after ore dressing handles and obtains rare earth ore concentrate, then Extraction of rare earth.But the rare earth phosphorus contained in mixed type rare-earth mineral Hydrochlorate mineral (monazite) are even more to be difficult to be decomposed with acid at normal temperatures, although existing even if also sufficiently stable under the high temperature conditions Sulfuric acid baking and caustic soda decompose both approaches technology maturation, and industrially widely apply, but deposited in terms of environmental protection, energy-conservation In drawback.
Sintering temperature can produce a large amount of fluorine-containing typically between 600 DEG C -800 DEG C during rare earth ore concentrate concentrated sulfuric acid high-temperature roasting The highly acid waste gas and height of SiClx, hydrogen fluoride, sulfur dioxide, sulfur trioxide etc. put waste residue, there is presently no economical and effective, for enterprise The receptible processing method of industry institute, accumulates over a long period and increasingly can not be ignored to being endangered caused by environment.
It is a kind of classical decomposition method to decompose rare-earth mineral with caustic soda, soda processes decompose mixed rare earth concentrate with it is solitary Stone is identical, it is also desirable to makees raw material with the rare earth ore concentrate of high rare-earth content.Because no acidic pernicious gas produces in decomposable process, therefore Without the waste gas treatment equipment of bulky complex, therefore this technique has been obtained for comparatively fast promoting.But due to caustic soda price Go up, and subsequent technique needs substantial amounts of acid to be dissolved, and has had a strong impact on the economic benefit of manufacturer.
Sal-ammoniac Roasting Decomposition mixed rare earth concentrate Extraction of rare earth technique, is that one kind passes through NH4Cl is in certain temperature bar The method that HCl makes the rare-earth chlorination in mineral be rare earth-iron-boron is resolved under part.This method needs to use double roasting, and first It is secondary, the monazite and bastnaesite point for being calcined and making in mixed rare earth concentrate are mixed with sodium carbonate and packet header mixed rare earth concentrate Solution washes isolated rare earth oxide and carries out second and be calcined into rare earth oxide and sodium fluoride, will be first with sal-ammoniac The rare earth oxide chlorination generated in secondary roasting is rare earth-iron-boron, then obtains rare earth-iron-boron through washing.But in the technique Need double roasting, wash twice, the shortcomings of process is complicated, and cost is high be present.
The content of the invention
For the above-mentioned problems in the prior art, for solve rare earth ore concentrate exist in the prior art " three wastes " it is serious, The deficiencies of big cost of amount of caustic soda is high, subsequent technique needs a large amount of acid dissolvings part, there is provided a kind of revolving bed handles rare earth ore concentrate Method.In the method for the invention, for roasting process of the present invention without largely using alkali, product of roasting Extraction of rare earth can directly add water logging Go out, without introducing acid, alkali, its cost is low, good in economic efficiency, environmental protection index is good.
According to an aspect of the present invention, there is provided a kind of method of revolving bed processing rare earth ore concentrate, comprise the following steps：
1) by rare earth ore concentrate, sodium carbonate, chlorinating agent, binding agent according to part by weight carry out dispensing, stir and evenly mix, mixed Compound material；
2) mixed material is subjected to pelletizing shaping, aqueous green pellets is made；
3) aqueous green pellets is dried or dried, obtain rare earth dry bulb group；
4) rare earth dry bulb is rolled into a ball and be calcined using revolving bed, obtain hot pelletizing；
5) by hot pelletizing water quenching, add calcium chloride and carry out wet grinding, obtain ore pulp；
6) by slurry filtration or suction filtration and washing is eluted, makes separation of solid and liquid, obtain filter residue and re chloride.
According to one embodiment of present invention, wherein step 1) middle rare earth concentrate RARE EARTH MINERALS IN includes phosphate, fluorine carbon Hydrochlorate.
According to one embodiment of present invention, the wherein weight of step 1) middle rare earth concentrate, sodium carbonate, chlorinating agent, binding agent It is 100 to measure proportion scale：5-35：30-100：3-15.
According to one embodiment of present invention, REO weight content is 20%- wherein in step 1) middle rare earth concentrate 60%.
According to one embodiment of present invention, the pelletizing particle diameter of aqueous green pellets is 6mm-12mm wherein in step 2).
According to one embodiment of present invention, wherein step 3) middle rare earth dry bulb group water content is 0.5%-3%.
According to one embodiment of present invention, revolving bed burner hearth is closed structure wherein in step 4).
According to one embodiment of present invention, wherein step 4) carries out closed anaerobic roasting.
According to one embodiment of present invention, the temperature being wherein calcined in step 4) is 750 DEG C -1000 DEG C.
According to one embodiment of present invention, the addition of calcium chloride is hot pelletizing weight wherein described in step 5) 1%-20%.
Using above technical scheme, the present invention has the following advantages that compared with prior art：
1) closed roasting is carried out using revolving bed in the present invention, effectively flue dust can be controlled to produce, to being produced in roasting process Raw pernicious gas can also control effectively, and prevent from escaping, and have important environment protection significance.
2) revolving bed in the present invention is heated using regenerative gas heat radiation tube, on the one hand energy-saving, to helping Combustion air is preheated, and makes that using low burn value gas higher temperature, another aspect calcination atmosphere and burning gases can be burned to Isolate with outside air, reduce the dilution to calcination atmosphere, be more beneficial for the progress of reaction, the addition of addition agent can be reduced Amount, reduces cost.
3) do not have to a large amount of acid without the roasting of a large amount of caustic soda and product of roasting in the present invention and dissolve, without multiple roasting, water Wash, method of the invention directly carries out one one-step baking-washing, you can obtain rare earth-iron-boron product, its technique is simple, cost compared with It is low, better economic benefit.
4) anaerobic roasting is carried out in the case where completely cutting off air using revolving bed in the present invention, trivalent Ce quilts in roasting process can be avoided Tetravalence Ce is oxidized to, tetravalence Ce is relatively difficult to form chloride with Cl, enters in water-washing process in slag, influence rare earth total recovery. Therefore present invention isolation air roasting, be advantageous to improve rare earth total recovery.
5) product of roasting is water-soluble in the present invention obtains product, is leached without acid adding, few to equipment corrosion, saves to acid Property devil liquor recovery handling process.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will more in the description carried out to embodiment is combined with accompanying drawing Add obvious and be readily appreciated that, wherein：
Fig. 1 shows the schematic flow sheet of the method for the revolving bed processing rare earth ore concentrate according to the present invention；
Fig. 2 shows the schematic block diagram of the system of the method processing rare earth ore concentrate using the present invention.
Embodiment
It should be appreciated that shown embodiments of the invention are merely illustrative in the exemplary embodiment.Although in this hair Only a small number of embodiments are described in detail in bright, but those skilled in the art are readily appreciated that and depart from the present invention in not essence In the case of the teaching of theme, a variety of modifications are feasible.Correspondingly, all such modifications should all be included in the present invention's In the range of.Without departing from the spirit of the invention, design, operating condition and ginseng that can be to following exemplary embodiment Number etc. makes others and replaces, changes, changes and delete.
The present invention provides a kind of method of revolving bed processing rare earth ore concentrate.Reference picture 1, this method comprises the following steps：
1) by rare earth ore concentrate, sodium carbonate, chlorinating agent, binding agent according to part by weight carry out dispensing, stir and evenly mix, mixed Compound material；
2) mixed material is subjected to pelletizing shaping, aqueous green pellets is made；
3) aqueous green pellets is dried or dried, obtain rare earth dry bulb group；
4) rare earth dry bulb is rolled into a ball and be calcined using revolving bed, obtain hot pelletizing；
5) by hot pelletizing water quenching, add calcium chloride and carry out wet grinding, obtain ore pulp；
6) by slurry filtration or suction filtration and washing is eluted, makes separation of solid and liquid, obtain filter residue and re chloride.
According to one embodiment of present invention, wherein step 1) middle rare earth concentrate RARE EARTH MINERALS IN includes phosphate, fluorine carbon Hydrochlorate, it is preferred that contain SiO in concentrate2More than 0.5%.Contain a certain amount of SiO in concentrate2Be advantageous to calcination；Chlorinating agent is Chlorate, preferably solid sodium chloride or solution；Binding agent is that clay mineral and organic binder bond are manufactured compound viscous in proportion Agent is tied, clay mineral is preferably bentonite, clay, and organic binder bond is preferably sodium humate, modified starch, carboxymethyl cellulose Sodium.
According to one embodiment of present invention, the wherein weight of step 1) middle rare earth concentrate, sodium carbonate, chlorinating agent, binding agent It is 100 to measure proportion scale：5-35：30-100：3-15.
According to one embodiment of present invention, REO weight content is 20%- wherein in step 1) middle rare earth concentrate 60%.
According to one embodiment of present invention, the pelletizing particle diameter of aqueous green pellets is 6mm-12mm wherein in step 2).Ball Granule footpath is too small, influences revolving bed treating capacity；Pelletizing particle diameter is excessive, influences pelletizing and is heated evenly, and pelletizing outer layer is completely anti- Should, and pelletizing kernel may be unreacted.
According to one embodiment of present invention, step 3) middle rare earth dry bulb group water content is 0.5-3%.Rare earth pelletizing is aqueous Deficiency, vapor deficiency, is unfavorable for the progress of calcination in stove.Rare earth dry bulb group is aqueous too high, and pelletizing may be caused to revolve Rotated bed internal fissure.
According to one embodiment of present invention, rotation bed structure is wherein in step 4)：Revolving bed ring-shaped furnace bottom just on Side, has been evenly arranged gas fired radiant tubes.It is preferred that radiant tube is regenerative gas radiant tube, you can combustion gas body can burn in radiant tube Heat release, carry out heat radiation.Heat radiation tube both ends are connected with heat storage, are heated using heat storage type combustion, combustion air are carried out pre- Heat, it can further reduce the energy consumption of roasting technique and the heating-up temperature of radiant tube can be improved.Fuel gas used can be low heat value Combustion gas such as blast furnace gas, coal gas etc., minimum reachable 700~800 kilocalories of preferable gas heating value..
Revolving bed burner hearth is sealing structure, carries out closed anaerobic roasting：Revolving bed material inlet is provided with screw feeder dress Put, material inlet is sealed using feed method of piling；Revolving bed discharging opening is directly connected to granulating unit, such as prevents furnace gas From material inlet, discharging opening effusion pollution environment.In the lateral wall of annular furnace, centre position is provided with flue outlet, flue gas by Air-introduced machine exports, and can adjust air pressure in air-introduced machine power adjusting burner hearth is tiny structure (- 5pa~-50pa).
According to one embodiment of present invention, the temperature being wherein calcined in step 4) is 750 DEG C -1000 DEG C, rare earth Dry bulb group is 30-100min the residence time in revolving bed.Sintering temperature is too low, calcination do not occur or reaction rate compared with Slowly.Sintering temperature is too high, and high energy consumption is uneconomical, and influences the long-term effective operation of equipment.
Revolving bed roasting is different from the roasting of the other equipments such as rotary kiln, tunnel cave.Revolving bed is heated using radiant tube, roasting Space is closed space, and calcination atmosphere in stove is effectively spaced apart with burning gases and outside air, reduces gas to gas in stove The agitation and dilution of atmosphere, are more beneficial for being smoothed out for calcination, can effectively reduce chlorinating agent dosage.Closed roasting is empty Between, the control and processing to caused waste gas in roasting process and pernicious gas are strengthened, is avoided around gas leakage pollution Air, so it is good to carry out roasting environmental protection index amount using revolving bed.
Rare earth dry bulb group is evenly laid out to be rotated in revolving bed ring-shaped furnace bottom with furnace bottom, because thermal radiation pipe heats, Temperature gradually rises, and the moisture in pelletizing produces vapor with crystallization water evaporation.In temperature-rise period, when temperature reaches 600 DEG C of left sides When right, rare earth ore concentrate starts to decompose generation rare earth oxide in the presence of sodium carbonate.Temperature continues to raise, when temperature reaches At 750 DEG C or so, chlorinating agent gangue (SiO in vapor, binding agent and concentrate2) synergy under, generation of decomposing HCl gases, rare earth oxide or rare earth ore concentrate react in the presence of HCl gases is generated as rare earth-iron-boron, and now calcium, The impurity such as aluminium, silicon, magnesium and HCL reactions are more difficult, hardly react.Therefore it is follow-up water-washing process middle rare earth chloride Water is dissolved in, is present in impurity such as calcium, aluminium, silicon, magnesium in insoluble matter, there is provided good separation condition.
According to one embodiment of present invention, calcium chloride, calcium ion and ore pulp F are added in the grinding process of step 5)-、 PO4 3-、SO4 2-Plasma reaction generation precipitation, into filter residue.Pulp density is 45%-85% in grinding process, obtains ore pulp In fineness of materials account for more than 80% for below 0.074mm.The addition of calcium chloride is the 1%-20% of hot pelletizing weight.
In the present invention, after the roasting of rare earth ore concentrate rotated bed, generation is easy for the rare earth-iron-boron of water, in water-washing process Enrichment enters solution, and the impurity such as realization and calcium, aluminium, iron, silicon, phosphorus, magnesium efficiently separates.
In addition, the present invention also provides a kind of system that rare earth ore concentrate is handled using the above method, as shown in Fig. 2 the system By proportioner S100, shaped device S200, drying unit S300, revolving bed calciner S400, ore grinding device S500, solid-liquid Separation elution device S600 is sequentially connected composition.
Referring to specific embodiment, the present invention will be described.
Embodiment 1
Phosphate rare earth ore concentrate, REO weight contents are 20%.By rare earth ore concentrate, sodium carbonate, sodium chloride, binding agent (clay 50%+50% sodium carboxymethylcelluloses) by weight proportion 100：5：30：3 dispensings mix stirring and obtain mixed material, by what is obtained Mixed material carries out pelletizing shaping and the aqueous green pellets that pelletizing particle diameter is 8mm is made.The aqueous green pellets by made from is in 150 DEG C of bakings Aqueous 1% rare earth dry bulb group is obtained after dry.Then rare earth dry bulb is rolled into a ball and be calcined using revolving bed, sintering temperature 1000 DEG C, rare earth dry bulb group residence time in revolving bed is 30min, and revolving bed carries out closed spoke using regenerative gas radiant tube Heating is penetrated, hot pelletizing is obtained after roasting.The hot pelletizing direct-water-quenching that will be obtained, and the calcium chloride of addition 1% is (with hot ball The percentage by weight meter of group) wet grinding is carried out, pulp density is 67% in grinding process, and it is 0.074mm to obtain fineness of materials 85% ore pulp is accounted for below.Finally obtained ore pulp is filtered, filter cake adds water wash, makes separation of solid and liquid, obtains filter residue and chlorination Earth solution.
It is as shown in table 1 using the testing result of this method.As shown in Table 1, obtained using the above-mentioned technical proposal of the present invention Rare earth total recovery up to 81.40%.
Embodiment 2
Rare earth bulk concentrate, REO weight contents are 50%.By rare earth ore concentrate, sodium carbonate, sodium chloride, binding agent (clay 80%+20% sodium humates) by weight proportion 100：20：80：10 dispensings mix stirring and obtain mixed material, the mixing that will be obtained Material carries out pelletizing shaping and the aqueous green pellets that pelletizing particle diameter is 12mm is made.The aqueous green pellets by made from is in 200 DEG C of drying Aqueous 0.5% rare earth dry bulb group is obtained afterwards.Then rare earth dry bulb is rolled into a ball and be calcined using revolving bed, sintering temperature 900 DEG C, rare earth dry bulb group residence time in revolving bed is 80min, and revolving bed carries out closed spoke using regenerative gas radiant tube Heating is penetrated, hot pelletizing is obtained after roasting.The hot pelletizing direct-water-quenching that will be obtained, and the calcium chloride of addition 12% is (with hot The percentage by weight meter of pelletizing) wet grinding is carried out, pulp density is 75% in grinding process, and obtaining fineness of materials is Below 0.074mm accounts for 95% ore pulp.Finally obtained ore pulp is filtered, filter cake adds water wash, makes separation of solid and liquid, obtains filter residue And re chloride.
It is as shown in table 1 using the testing result of this method.As shown in Table 1, obtained using the above-mentioned technical proposal of the present invention Rare earth total recovery up to 93.46%.
Embodiment 3
Rare earth bulk concentrate, REO weight contents are 60%.By rare earth ore concentrate, sodium carbonate, sodium chloride, binding agent (bentonite 70%+30% modified starches) by weight proportion 100：30：100：15 dispensings mix stirring and obtain mixed material, mixed by what is obtained Compound material carries out pelletizing shaping and the aqueous green pellets that pelletizing particle diameter is 10mm is made.The aqueous green pellets by made from is in 200 DEG C of bakings Aqueous 2% rare earth dry bulb group is obtained after dry.Then rare earth dry bulb is rolled into a ball and be calcined using revolving bed, sintering temperature 750 DEG C, rare earth dry bulb group residence time in revolving bed is 100min, and revolving bed carries out closed using regenerative gas radiant tube Radiant heating, hot pelletizing is obtained after roasting.The hot pelletizing direct-water-quenching that will be obtained, and the calcium chloride of addition 20% is (with warm The percentage by weight meter of state pelletizing) wet grinding is carried out, pulp density is 85% in grinding process, and obtaining fineness of materials is Below 0.074mm accounts for 95% ore pulp.Finally obtained ore pulp is filtered, filter cake adds water wash, makes separation of solid and liquid, obtains filter residue And re chloride.
It is as shown in table 1 using the testing result of this method.As shown in Table 1, obtained using the above-mentioned technical proposal of the present invention Rare earth total recovery up to 94.46%.
Embodiment 4
Fluoro carbonate rare earth ore concentrate, REO weight contents are 40%.Rare earth ore concentrate, sodium carbonate, sodium chloride, binding agent is (swollen Profit soil) by weight proportion 100：35：60：12 dispensings mix stirring and obtain mixed material, and obtained mixed material is carried out into pelletizing The aqueous green pellets that pelletizing particle diameter is 6mm is made in shaping.Obtained aqueous green pellets is obtained aqueous 3% after 80 DEG C of drying Rare earth dry bulb group.Then rare earth dry bulb is rolled into a ball and be calcined using revolving bed, sintering temperature is 1000 DEG C, and rare earth dry bulb group is revolving The residence time is 60min in rotated bed, and revolving bed carries out closed radiant heating using regenerative gas radiant tube, obtained after roasting Hot pelletizing.The hot pelletizing direct-water-quenching that will be obtained, and the calcium chloride of addition 10% is (with the percentage by weight of hot pelletizing Meter) wet grinding is carried out, pulp density is 45% in grinding process, obtains the ore deposit that fineness of materials accounts for 80% for below 0.074mm Slurry.Finally obtained ore pulp is filtered, filter cake adds water wash, makes separation of solid and liquid, obtains filter residue and re chloride.
It is as shown in table 1 using the testing result of this method.As shown in Table 1, obtained using the above-mentioned technical proposal of the present invention Rare earth total recovery up to 90.36%.
Embodiment 5
Rare earth bulk concentrate, REO weight contents are 60%.By rare earth ore concentrate, sodium carbonate, sodium chloride, binding agent (bentonite 90%+10% sodium carboxymethylcelluloses) by weight proportion 100：35：100：10 dispensings mix stirring and obtain mixed material, will The mixed material arrived carries out pelletizing shaping and the aqueous green pellets that pelletizing particle diameter is 12mm is made.The aqueous green pellets by made from exists Aqueous 0.5% rare earth dry bulb group is obtained after 200 DEG C of drying.Then rare earth dry bulb is rolled into a ball and be calcined using revolving bed, is calcined Temperature is 800 DEG C, and rare earth dry bulb group residence time in revolving bed is 100min, and revolving bed is carried out closed using gas fired radiant tubes Formula radiant heating, hot pelletizing is obtained after roasting.The hot pelletizing direct-water-quenching that will be obtained, and add 20% calcium chloride (with The percentage by weight meter of hot pelletizing) wet grinding is carried out, pulp density is 80% in grinding process, and obtaining fineness of materials is Below 0.074mm accounts for 95% ore pulp.Finally obtained ore pulp is filtered, filter cake adds water wash, makes separation of solid and liquid, obtains filter residue And re chloride.
It is as shown in table 1 using the testing result of this method.As shown in Table 1, obtained using the above-mentioned technical proposal of the present invention Rare earth total recovery up to 95.63%.
Table 1 adopts the testing result being obtained by the present invention
Sequence number Rare earth total recovery (%)
Embodiment 1 81.40
Embodiment 2 93.46
Embodiment 3 94.46
Embodiment 4 90.36
Embodiment 5 95.63
Presently preferred embodiments of the present invention is the foregoing is only, is not used for limiting the practical range of the present invention；If do not take off From the spirit and scope of the present invention, the present invention is modified or equivalent substitution, all should covered in the claims in the present invention Among protection domain.

Claims (10)

  1. A kind of 1. method of revolving bed processing rare earth ore concentrate, it is characterised in that comprise the following steps：
    1) by rare earth ore concentrate, sodium carbonate, chlorinating agent, binding agent according to part by weight carry out dispensing, stir and evenly mix, obtain mixture Material；
    2) mixed material is subjected to pelletizing shaping, aqueous green pellets is made；
    3) the aqueous green pellets is dried or dried, obtain rare earth dry bulb group；
    4) the rare earth dry bulb is rolled into a ball and be calcined using revolving bed, obtain hot pelletizing；
    5) by the hot pelletizing water quenching, add calcium chloride and carry out wet grinding, obtain ore pulp；
    6) by the slurry filtration or suction filtration and washing is eluted, makes separation of solid and liquid, obtain filter residue and re chloride.
  2. 2. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein described in step 1) Rare earth ore concentrate RARE EARTH MINERALS IN includes phosphate, fluoro carbonate.
  3. 3. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein step 1) middle rare earth Concentrate, sodium carbonate, chlorinating agent, the weight batching ratio of binding agent are 100：5-35：30-100：3-15.
  4. 4. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein described in step 1) REO weight content is 20%-60% in rare earth ore concentrate.
  5. 5. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein described in step 2) The pelletizing particle diameter of aqueous green pellets is 6mm-12mm.
  6. 6. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein described in step 3) Rare earth dry bulb group water content is 0.5%-3%.
  7. 7. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein described in step 4) Revolving bed burner hearth is closed structure.
  8. 8. the method for revolving bed processing rare earth ore concentrate according to claim 7, it is characterised in that wherein carried out in step 4) Closed anaerobic is calcined.
  9. 9. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein carried out in step 4) The temperature of roasting is 750 DEG C -1000 DEG C.
  10. 10. the method for revolving bed processing rare earth ore concentrate according to claim 1, it is characterised in that wherein institute in step 5) The addition for stating calcium chloride is the 1%-20% of hot pelletizing weight.
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