CN106636626A - System and method for processing rare earth concentrates - Google Patents

System and method for processing rare earth concentrates Download PDF

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Publication number
CN106636626A
CN106636626A CN201611146755.8A CN201611146755A CN106636626A CN 106636626 A CN106636626 A CN 106636626A CN 201611146755 A CN201611146755 A CN 201611146755A CN 106636626 A CN106636626 A CN 106636626A
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CN
China
Prior art keywords
rare earth
ore concentrate
concentrate
roasting
ore
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CN201611146755.8A
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Chinese (zh)
Inventor
吴道洪
陈文亮
刘占华
王欣
王岩
曹志成
左晓鹏
丁银贵
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江苏省冶金设计院有限公司
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Priority to CN201611146755.8A priority Critical patent/CN106636626A/en
Publication of CN106636626A publication Critical patent/CN106636626A/en

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/02Roasting processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/2406Binding; Briquetting ; Granulating pelletizing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders
    • C22B1/244Binding; Briquetting ; Granulating with binders organic
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B59/00Obtaining rare earth metals
    • Y02P10/234

Abstract

The invention discloses a system and method for processing rare earth concentrates. The method comprises the steps that the rare earth concentrates, sodium carbonate, a chloridizing agent, a vulcanizing agent and a bonding agent are blended in a blending device; then mixed materials are prepared into rare earth green pellets in a forming device; the rare earth green pellets are fed into a rotating packed bed to be calcinated to obtain hot pellets; then the hot pellets are subjected to water quenching, and calcium chloride is added for wet ore grinding in an ore grinding device to obtain ore pulp; and the ore pulp is subjected to filtration or suction filtration in a solid-liquid separation leaching device to obtain filter residues and a chloridized rare earth solution. By adoption of the system and method for processing the rare earth concentrates, the problems that in the prior art, three waste pollution is serious, caustic soda is large in dosage and high in cost, and a large amount of acid is needed for dissolution in subsequent processes are solved.

Description

A kind of system and method for processing rare earth ore concentrate

Technical field

The present invention relates to rare earth metallurgy technical field, more particularly to a kind of system and method for processing rare earth ore concentrate.

Background technology

The rare earth reserves of China are first place in the world, but in explored Rare Earth Mine, mostly complicated component, content of rare earth It is few, it is unfavorable for industrial directly application.It is 50%~60% currently used for the grade of industrial mixed rare earth concentrates, and The content of rare earth of raw ore is then far below this level, therefore need to effectively remove the gangue mineral in rare-earth original ore and objectionable impurities composition Remove, i.e., Jing after ore dressing is processed and obtains rare earth ore concentrate, then Extraction of rare earth.But the RE phosphate ore deposit contained in mixed type rare-earth mineral Thing (monazite) is even more even if also sufficiently stable under the high temperature conditions, at normal temperatures and is difficult to acid decomposition, although existing sulfuric acid Roasting and caustic soda decompose both approaches technology maturation, and industrially widely apply, but there is disadvantage in terms of environmental protection, energy-conservation End.

Sintering temperature can be produced a large amount of containing fluorination typically between 600~800 DEG C during rare earth ore concentrate concentrated sulfuric acid high-temperature roasting The highly acid waste gas of silicon, hydrogen fluoride, sulfur dioxide, sulfur trioxide etc. and height put waste residue, there is presently no economical and effective, for enterprise The receptible processing method of institute, accumulates over a long period and the harm that environment is produced increasingly can not be ignored.

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 make raw material with high-grade rare earth ore concentrate.Because no acidic pernicious gas is produced in decomposable process, therefore need not The waste gas treatment equipment of bulky complex, therefore this technique has been obtained for very fast popularization.But due to the rise of caustic soda price, and Subsequent technique needs substantial amounts of acid to be dissolved, the serious economic benefit that have impact on manufacturer.

Sal-ammoniac Roasting Decomposition mixed rare earth concentrate Extraction of rare earth technique is a kind of by NH4Cl is in uniform temperature bar The method that HCl makes the rare-earth chlorination in mineral for rare earth-iron-boron is resolved under part.The method needs to adopt double roasting, and first Secondary, mixing roasting with sodium carbonate and packet header mixed rare earth concentrate divides monazite and bastnaesite in mixed rare earth concentrate Into rare earth oxide and sodium fluoride, wash isolated rare earth oxide carries out second roasting to solution, will be the with sal-ammoniac In roasting generate rare earth oxide chlorination be rare earth-iron-boron, then Jing washing obtain rare earth-iron-boron.If can overcome The shortcomings of double roasting being needed in above-mentioned technique, is washed twice, the technique will be real efficient, cleaning, comprehensive utilization of resources Smelting process.

A kind of " mixed rare earth concentrates liquid alkali roasting is disclosed in the Chinese patent of Patent No. ZL201010145840.9 Decomposition extraction process ", it proposes a kind of new decomposition technique, rare earth ore concentrate is mixed with sodium hydroxide solution, in rotary kiln The resources such as middle Roasting Decomposition, mineral synthesis Extraction of rare earth, fluorine, phosphorus and calcium after decomposition, technical process is without waste gas, waste residue.The skill The key of art is the Roasting Decomposition process after rare earth ore concentrate mixes with sodium hydroxide solution in rotary kiln.

But evaporate quickly because slip enters moisture after rotary kiln, Rare Earth Mine and NaOH can be formed in kiln hood low-temperature zone The lump hardness that lump and ring formation, Rare Earth Mine and NaOH ring formation are formed is very high, conventional blade structure design rotary kiln without Method scrapes off the ring formation of formation, roasting is carried out continuously.

Notification number discloses " a kind of process of preveting kiln ringing " for the Chinese patent of CN102706141A, its Ring formation during sulfuric acid of rare-earth concentrate high-temperature roasting is solved, the method arranges back material hole by the low-temperature zone in rotary kiln, in high temperature section Arrange and instead expect hole, back material hole and anti-material hole, with conveying pipeline connection, make the roasted ore part return of high temperature section low outside rotary kiln Temperature section participates in roasting again, and by such mode ring formation is solved the problems, such as.But in concentrated sulfuric acid high-temperature roasting rare earth ore concentrate process In, cause rotary kiln inside ring formation phenomenon to occur than reasons such as imbalances mainly due to ore deposit acid, it is by by high temperature section material parts Return, alleviate ore deposit acid than imbalance, to solve the problems, such as ring formation.This is different from the ring formation principle of Rare Earth Mine caustic soda Roasting Decomposition, therefore Said method is not applied to the ring formation problem of Rare Earth Mine caustic soda Roasting Decomposition.

Notification number discloses a kind of " mixed rare earth concentrates liquid caustic soda low-temperature bake decomposition for the Chinese patent of CN101824531A Technique ", it realizes the continuous prodution of caustic digestion mischmetal ore deposit, and technical process is realized clear without waste gas and ammonia nitrogen waste water Clean production and comprehensive utilization of resources.But said method alkali consumption is too high, sodium hydroxide concentration is up to the 50% of rare earth ore concentrate quality, Even 150%.And caustic soda price is higher, the technique productions cost is caused to increase, therefore economic benefit is poor.

The content of the invention

For the above-mentioned problems in the prior art, system and the side of a kind of process rare earth ore concentrate are inventors herein proposed Method.Solve and exist in rare earth ore concentrate prior art that " three wastes " serious, the big high cost of amount of caustic soda, subsequent technique need a large amount of acid The problems such as dissolving.

To achieve these goals, the invention discloses a kind of method for processing rare earth ore concentrate, comprises the steps of:

Step one:In proportioner by rare earth ore concentrate, sodium carbonate, chlorinating agent, vulcanizing agent and binding agent by weight Example carries out dispensing and mixes, and obtains mixed material;

Step 2:Mixed material is prepared into into rare earth green pellets in shaped device;

Step 3:Rare earth green pellets feeding revolving bed is carried out into roasting, hot pelletizing is obtained;

Step 4:By hot pelletizing water quenching, add calcium chloride that wet grinding is carried out in ore grinding device, obtain ore pulp;

Step 5:By slurry filtration or suction filtration in separation of solid and liquid elution device, filter residue and re chloride are obtained.

Further, the ingredients by weight ratio of step one middle rare earth concentrate, sodium carbonate, chlorinating agent, vulcanizing agent and binding agent For 100:5-35:30-100:2-30:0.5-10.

Further, the rare earth ore concentrate in step one is phosphate ore rare earth ore concentrate, fluoro carbonate ore deposit rare earth ore concentrate or mixed Mould assembly rare earth ore concentrate.Caustic soda or soda ash can effectively decompose the rare earth ore concentrate of such mineral.The content of REO preferably in rare earth ore concentrate For more than 30%;Rare earth ore concentrate granularity is preferably below 0.074mm and accounts for more than 60%.When REO is less than 30%, impurity in concentrate Too high levels, affect reaction to carry out, and the various additives for adding are relatively more, cause cost to raise.Further, step one The ingredients by weight ratio of middle rare earth concentrate, sodium carbonate, chlorinating agent, vulcanizing agent and binding agent is 100:5-35:30-100:2-30: 1-10。

Further, sodium carbonate is water-containing crystal sodium carbonate and/or natrium carbonicum calcinatum, and chlorinating agent is chlorate, preferably Solid sodium chloride or solution.Vulcanizing agent is sulphur or sulphide concentrate, preferably sulphur.

Further, binding agent is sodium humate, modified starch, sodium carboxymethylcellulose, pectin, guar gum, syrup, paste One or more in essence.

Further, step 2 middle rare earth green pellets particle diameter is 6-16mm, and pelletizing particle diameter is too small, affects revolving bed to process Amount;Pelletizing particle diameter is excessive, affects pelletizing to be heated evenly, and pelletizing outer layer has completely reacted, and pelletizing kernel may be unreacted.

Further, step 3 middle rare earth green pellets is sent directly into roasting in revolving bed without drying.Aqueous green pellets Directly enter stove roasting, save stoving process, it is further energy-saving.The rare earth green pellets water content for directly entering stove is preferably 2- 4%.If the aqueous deficiency of rare earth pelletizing, vapor is not enough in stove, is unfavorable for calcination.Rare earth green pellets is aqueous too high, can Pelletizing can be caused in revolving bed internal fissure.

Further, the roasting in step 3 is carried out within the temperature range of 600-900 DEG C, pelletizing roasting in revolving bed Time is 30-80min.Temperature calcination temperature is too low, and calcination does not occur or reaction rate is slower.Sintering temperature is too high, High energy consumption is uneconomical, and affects the long-term effective operation of equipment.

Further, the calcium chloride quality of addition is with the mass ratio of hot pelletizing during the wet grinding of step 4 1:100-20:100.Calcium ion and ore pulp F-, PO in grinding process4 3-、SO4 2-Plasma reaction generates precipitation, in filter residue. Pulp density is 45%-85% in grinding process.

Further, the fineness of ore pulp is that below 0.074mm is more than 80% in step 4.

Further, after the rotated bed roasting of rare earth ore concentrate, rare earth-iron-boron soluble in water is generated, it is rich in water-washing process Collection enters the aqueous solution, realizes being separated with the impurity such as calcium, aluminium, iron, silicon, phosphorus, magnesium, sulphur.

Additionally, present invention also offers a kind of use preceding method process rare earth ore concentrate system, including proportioner, into Type device, revolving bed calciner, granulating unit, ore grinding device and separation of solid and liquid elution device.

Rare earth ore concentrate complete in proportioner dispensing obtain mixed material after mixed material is sent into into shaped device, by into Type device is prepared into rare earth green pellets.Subsequently, rare earth green pellets is admitted to revolving bed and carries out roasting.

Revolving bed has ring-shaped furnace bottom, shell, helixes feed equipment and discharging opening, and ring-shaped furnace bottom forms roasting with shell Chamber, has been evenly arranged heat radiation tube directly over ring-shaped furnace bottom, is heated using radiant tube.Radiant tube is preferably heat accumulating type Gas fired radiant tubes, you can combustion gas body carries out heat radiation in radiant tube energy combustion heat release, while heat radiation tube two ends are connected with two Heat storage carries out heat storage type combustion heating with preheating gas.Heated using heat storage type combustion method, the energy to reducing roasting technique Consumption and raising heating-up temperature are respectively provided with significance.Fuel gas used can be low-calorie combustion gas such as blast furnace gas, coal gas Deng minimum reachable 700~800 kilocalories of preferred gas heating value.By adopting feed method of piling pair during helixes feed equipment feeding Charging aperture is sealed;Revolving bed discharging opening is directly connected to granulating unit, to prevent furnace gas from escaping from charging aperture, discharging opening Pollution environment.In the lateral wall of annular furnace, the nearly material inlet position of annular is provided with flue outlet, and flue gas is led by air-introduced machine Go out, can adjust air pressure in air-introduced machine power adjusting burner hearth is tiny structure (such as -5pa~-50pa).In the side wall of annular furnace, The centre position of annular is provided with air inlet, according to calcination state, a small amount of air or oxygen is filled in good time.Revolving bed roasting It is different from the other equipment roasting such as rotary kiln, tunnel cave.Revolving bed is heated using gas fired radiant tubes, and the roasting space is that closed is empty Between, calcination atmosphere in stove is effectively spaced apart with burning gases or outside air, the agitation to furnace atmosphere and dilution are reduced, more have Being smoothed out beneficial to calcination, is effectively reduced chlorinating agent and vulcanizing agent consumption.The closed roasting space, strengthens to roasting The control and process of the waste gas and pernicious gas that produce during burning, it is to avoid gas leakage pollution surrounding air, so using It is good that revolving bed carries out roasting environmental protection index amount.

Rare earth green pellets is evenly laid out to be rotated in revolving bed ring-shaped furnace bottom with furnace bottom, due to the heating of thermal radiation pipe, 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 start in the presence of sodium carbonate decompose generate rare earth oxide, while chlorinating agent vulcanizing agent, oxygen, React to form a large amount of HCl and Cl through series of complex under the effect such as vapor2Mixed gas.Rare earth oxide or rare earth ore concentrate In HCl and Cl2Reaction is generated as rare earth-iron-boron in the presence of mixed gas, and the now impurity such as calcium, aluminium, silicon, magnesium reaction is tired Difficulty, hardly reacts, therefore is washed with water for follow-up rare earth-iron-boron and is dissolved in the aqueous solution, with the impurity such as calcium, aluminium, silicon, magnesium, iron Separate and provide good precondition.

The hot pelletizing obtained through roasting enters directly into granulating unit and carries out water quenching and add calcium chloride to fill in ore grinding Wet grinding is carried out in putting and obtains ore pulp, be subsequently sent in separation of solid and liquid elution device, by slurry filtration or suction filtration and drip washing, obtain Obtain filter residue and re chloride.

The System and method for of the process rare earth ore concentrate of the present invention has the advantages that:

(1) closed roasting is carried out using revolving bed in the present invention, energy effective control flue dust is produced, to producing in roasting process The preventing and treating that also can control effectively of raw pernicious gas is escaped, with important environment protection significance;

(2) heated using regenerative gas heat radiation tube using revolving bed in the present invention, it is on the one hand energy-saving, separately One side calcination atmosphere is separated with combustion gas, the external world, reduces the dilution to calcination atmosphere, is more beneficial for the carrying out reacted, while The addition of addition agent is also reduced, consuming cost is reduced;

(3) without the need for a large amount of caustic soda roastings in the present invention, product of roasting is not required to a large amount of acid and dissolves again, without multiple roasting, Washing, directly carries out one one-step baking-washing, you can rare earth-iron-boron product, process is simple, cost is relatively low, better economic benefit.

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 Plus it is obvious and easy to understand, wherein:

Fig. 1 shows the schematic flow sheet of the method for the treatment of in accordance with the present invention rare earth ore concentrate.

Fig. 2 shows the structured flowchart of the system for the treatment of in accordance with the present invention rare earth ore concentrate.

Specific embodiment

It should be appreciated that embodiments of the invention shown in the exemplary embodiment are merely illustrative.Although at this Only minority embodiment has been described in detail in bright, but those skilled in the art to be readily appreciated that and depart from the present invention in not essence In the case of the teaching of theme, various 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, can be to the design of following exemplary embodiment, operating condition and ginseng Number etc. makes others and replaces, changes, changes and delete.

Embodiment one

With reference to Fig. 1 and Fig. 2, by phosphate ore rare earth ore concentrate, sodium carbonate, sodium chloride, pyrite essence that REO contents are 20% By weight proportion the 100 of ore deposit (vulcanizing agent), sodium humate (binding agent):20:30:2:The 5 dispensing mixings in proportioner S100 And pelletizing is prepared in shaped device S200, rare earth green pellets of the particle diameter for 12mm-16mm, pelletizing aqueous 2% is obtained.Rare earth is given birth to Pelletizing carries out roasting using revolving bed calciner S300, and sintering temperature is 900 DEG C, and pelletizing is in revolving bed calciner S300 The time of staying is 30min.Revolving bed calciner S300 carries out closed radiant heating, gas in control stove using gas fired radiant tubes It is voltage-controlled to be made as tiny structure -30pa~-50pa.Hot pelletizing is sent directly into granulating unit from revolving bed calciner S300 after roasting S400 carries out water quenching, and add the calcium chloride of the hot weight of pelletizing 1% carries out wet type mill choosing, grinding process in ore grinding device S500 Middle pulp density is 60%, obtains the ore pulp that fineness is that below 0.074mm accounts for 80%.It is subsequently sent to separation of solid and liquid elution device Filter cake is added water wash by S600 to ore pulp suction filtration, obtains re chloride and filter residue.Rare earth total recovery is up to 83.4%.

Embodiment two

With reference to Fig. 1 and Fig. 2, by fluoro carbonate ore deposit rare earth ore concentrate, sodium carbonate, sodium chloride, sulphur that REO contents are 48% By weight proportion the 100 of (vulcanizing agent), sodium humate (binding agent):5:100:30:7 in proportioner S100 dispensing mix simultaneously Pelletizing is prepared in shaped device S200, rare earth green pellets of the particle diameter for 8mm-12mm, pelletizing aqueous 3% is obtained.Rare earth green-ball Group carries out roasting using revolving bed calciner S300, and sintering temperature is 800 DEG C, and pelletizing stops in revolving bed calciner S300 The time is stayed to be 60min.Revolving bed calciner S300 carries out closed radiant heating, air pressure in control stove using gas fired radiant tubes It is controlled to tiny structure -10pa~-20pa.Hot pelletizing is sent directly into granulating unit from revolving bed calciner S300 after roasting S400 carries out water quenching, and add the calcium chloride of the hot weight of pelletizing 5% carries out wet type mill choosing, grinding process in ore grinding device S500 Middle pulp density is 45%, obtains the ore pulp that fineness is that below 0.074mm accounts for 85%.It is subsequently sent to separation of solid and liquid elution device Filter cake is added water wash by S600 to ore pulp suction filtration, obtains re chloride and filter residue.Rare earth total recovery is up to 90.4%.

Embodiment three

With reference to Fig. 1 and Fig. 2, by mixed rare earth concentrates, sodium carbonate, sodium chloride, sulphur (sulfuration that REO contents are 60% Agent), by weight proportion the 100 of modified starch (binding agent):35:100:30:10 in proportioner S100 dispensing mix and Pelletizing is prepared in shaped device S200, rare earth green pellets of the particle diameter for 6mm-10mm, pelletizing aqueous 4% is obtained.Rare earth green pellets Roasting is carried out using revolving bed calciner S300, sintering temperature is 600 DEG C, and pelletizing is stopped in revolving bed calciner S300 Time is 80min.Revolving bed calciner S300 carries out closed radiant heating, air pressure control in control stove using gas fired radiant tubes It is made as tiny structure -5pa~-10pa.Hot pelletizing is sent directly into granulating unit S400 from revolving bed calciner S300 after roasting Water quenching is carried out, add the calcium chloride of the hot weight of pelletizing 15% carries out wet type mill choosing in ore grinding device S500, in grinding process Pulp density is 85%, obtains the ore pulp that fineness is that -200 mesh account for 95%.Separation of solid and liquid elution device S600 is subsequently sent to ore deposit Slurry suction filtration, and filter cake is added into water wash, obtain re chloride and filter residue.Rare earth total recovery is up to 95.4%.

Example IV

With reference to Fig. 1 and Fig. 2, by mixed rare earth concentrates, sodium carbonate, sodium chloride, sulphur (sulfuration that REO contents are 60% Agent), by weight proportion the 100 of sodium carboxymethylcellulose (binding agent):25:30:2:The 0.5 dispensing mixing in proportioner S100 And pelletizing is prepared in shaped device S200, rare earth green pellets of the particle diameter for 6mm-10mm, pelletizing aqueous 3% is obtained.Rare earth is given birth to Pelletizing carries out roasting using revolving bed calciner S300, and sintering temperature is 700 DEG C, and pelletizing is in revolving bed calciner S300 The time of staying is 70min.Revolving bed calciner S300 carries out closed radiant heating, gas in control stove using gas fired radiant tubes It is voltage-controlled to be made as tiny structure -5pa~-20pa.Hot pelletizing is sent directly into granulating unit from revolving bed calciner S300 after roasting S400 carries out water quenching, and add the calcium chloride of the hot weight of pelletizing 20% carries out wet type mill choosing, ore grinding mistake in ore grinding device S500 Pulp density is 70% in journey, obtains the ore pulp that fineness is that below 0.074mm accounts for 90%.It is subsequently sent to separation of solid and liquid elution device Filter cake is added water wash by S600 to ore pulp suction filtration, obtains re chloride and filter residue.Rare earth total recovery is up to 93.2%.

These are only presently preferred embodiments of the present invention, not for limit the present invention practical range;If without departing from this The spirit and scope of invention, modify or equivalent to the present invention, all should cover the protection in the claims in the present invention In the middle of scope.

Claims (10)

1. it is a kind of process rare earth ore concentrate method, it is characterised in that comprise the steps of:
Step one:Rare earth ore concentrate, sodium carbonate, chlorinating agent, vulcanizing agent and binding agent are entered by weight proportion in proportioner Row dispensing is simultaneously mixed, and obtains mixed material;
Step 2:The mixed material is prepared into into rare earth green pellets in shaped device;
Step 3:Rare earth green pellets feeding revolving bed is carried out into roasting, hot pelletizing is obtained;
Step 4:By hot pelletizing water quenching, be subsequently added calcium chloride carries out wet grinding in ore grinding device, obtains ore pulp;
Step 5:By the slurry filtration or suction filtration in separation of solid and liquid elution device, filter residue and re chloride are obtained.
2. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the step one middle rare earth concentrate, The ingredients by weight ratio of sodium carbonate, chlorinating agent, vulcanizing agent and binding agent is 100:5-35:30-100:2-30:0.5-10.
3. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the rare earth ore concentrate be phosphate ore Rare earth ore concentrate, fluoro carbonate ore deposit rare earth ore concentrate or mixed rare earth concentrate.
4. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the chlorinating agent be chlorate.
5. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the vulcanizing agent be sulphur, sulfuration Ore deposit concentrate.
6. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that during roasting in stove air pressure be controlled to it is micro- Negative pressure -5pa~-50pa.
7. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the step 2 middle rare earth green pellets Particle diameter is 6mm-16mm.
8. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the step 3 middle rare earth green pellets Being sent directly into revolving bed without stoving process carries out roasting.
9. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the roasting in the step 3 exists Carry out within the temperature range of 600-900 DEG C.
10. it is according to claim 1 process rare earth ore concentrate method, it is characterised in that the wet grinding of the step 4 During add calcium chloride quality and the hot pellet quality ratio be 1:100-20:100.
CN201611146755.8A 2016-12-13 2016-12-13 System and method for processing rare earth concentrates CN106636626A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1205363A (en) * 1997-12-09 1999-01-20 四川省北超稀土工程技术研究中心 Method of preparing cerium by separating and removing fluorine from bastnaesite raw material
CN1236017A (en) * 1999-06-25 1999-11-24 清华大学 Ammonium chloride process for extracting rare-earth chloride from bastnaesite fine ore
AU2012204844B2 (en) * 2011-01-06 2016-06-02 Areva Mines Dissolution and recovery of at least one element Nb or Ta and of at least one other element U or rare earth elements from ores and concentrates

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1205363A (en) * 1997-12-09 1999-01-20 四川省北超稀土工程技术研究中心 Method of preparing cerium by separating and removing fluorine from bastnaesite raw material
CN1236017A (en) * 1999-06-25 1999-11-24 清华大学 Ammonium chloride process for extracting rare-earth chloride from bastnaesite fine ore
AU2012204844B2 (en) * 2011-01-06 2016-06-02 Areva Mines Dissolution and recovery of at least one element Nb or Ta and of at least one other element U or rare earth elements from ores and concentrates

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