CN109569236A - A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy - Google Patents

A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy Download PDF

Info

Publication number
CN109569236A
CN109569236A CN201811457197.6A CN201811457197A CN109569236A CN 109569236 A CN109569236 A CN 109569236A CN 201811457197 A CN201811457197 A CN 201811457197A CN 109569236 A CN109569236 A CN 109569236A
Authority
CN
China
Prior art keywords
tail gas
rare earth
electrolysis
alloy
environmentally protective
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811457197.6A
Other languages
Chinese (zh)
Inventor
栾文洲
颜浩
曾佳
韩立国
周林
逄増栋
邓之金
杨桂林
严俊
夏爽
郭礼伟
朱清逸
肖银
徐建林
王霞
游芳
文涛
何继谋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leshan Research Rare Earth New Material Co Ltd
Original Assignee
Leshan Research Rare Earth New Material Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leshan Research Rare Earth New Material Co Ltd filed Critical Leshan Research Rare Earth New Material Co Ltd
Priority to CN201811457197.6A priority Critical patent/CN109569236A/en
Publication of CN109569236A publication Critical patent/CN109569236A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/34—Electrolytic production, recovery or refining of metals by electrolysis of melts of metals not provided for in groups C25C3/02 - C25C3/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/602—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide

Abstract

The present invention provides a kind of environmentally protective molten-salt electrolysis rare earth metal and the electrolysis tail gas absorption methods of alloy, belong to electrolysis tail gas disposal technique field, comprising: (1) remove particulate matter；(2) spray-absorption fluoro-gas；(3) solid-state rare earth oxide or rare-earth hydroxide absorb fluorinated tail gas；The present invention replaces limewash or sodium hydrate aqueous solution to carry out absorption processing to electrolysis tail gas using rare earth oxide, reduce the harmful substance in tail gas, the rare earth fluoride of generation is after post treatment, it can be used as electrolysis raw material to be added in electrolytic furnace, realize recycling for electrolysis vent gas treatment product.

Description

A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy
Technical field
The invention belongs to be electrolysed tail gas disposal technique field, more particularly to a kind of environmentally protective molten-salt electrolysis rare earth metal And the electrolysis tail gas absorption method of alloy.
Background technique
Rare earth is important strategic resource, is known as the good reputation of " industrial monosodium glutamate ".Rare earth element is highly active metal, It is difficult to be extract from its compound with general method under usual conditions.In industrial production mainly using fused salt electrolysis process and The method of metallothermic reduction produces rare earth metal or its alloy by the oxide, fluoride and chloride of rare earth.Currently, fused salt is electric Solution is widely used to large-scale production rare earth metal.
Preparation through Fluoride System in Fused-salt Electrolysis technology is to prepare the common method of light rare earth metal.The technology in electrolytic process Anode can generate fluorinated tail gas, and fluorinated tail gas is that pernicious gas need after treatment could qualified discharge.Existing technology is to use Limewash or sodium hydrate aqueous solution carry out absorption processing, absorb in the product of generation containing dangerous solid waste；And caustic wash tower In lye mutability it is at acid solution and gradually supersaturated, at this moment absorptivity decline causes to absorb not exclusively and give off fluorination hydrogen Body causes environmental pollution, while being electrolysed vent gas treatment product and can not continue to use in production, need additional process flow and Processing cost is handled.
Summary of the invention
Invention describes a kind of environmentally protective molten-salt electrolysis rare earth metal and the electrolysis tail gas absorption methods of alloy, can change It is apt in place of above-mentioned the deficiencies in the prior art.
The purpose of the present invention is realized by following methods:
The electrolysis tail gas absorption method of a kind of environmentally protective molten-salt electrolysis rare earth metal and alloy, steps are as follows:
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, further settles tail gas Particulate matter in one, and with the fluoro-gas and CO in tail gas one2Reaction generates rare earth fluoride precipitating, forms recovered liquid and tail gas Two.
Further, further include step S3, solid-state rare earth oxide or solid-state rare-earth hydroxide are made into filler and are set to row In Gas chimney, tail gas two is discharged into exhaust chimney, the fluoro-gas in tail gas two is further absorbed, reaction generates Rare earth fluoride solid.
Further, further include step S4, after producing a cycle, the filler in chimney is replaced.
Further, further include step S5, recovered liquid is subjected to filters pressing, drying and washing, forms rare earth fluoride solid.
Further, further include step S6, be added to electrolysis for rare earth fluoride solid in S2 and S4 as electrolysis raw material In furnace.
Preferably, the reaction temperature in eluting column is controlled at 0~60 DEG C.
Preferably, the reaction temperature in eluting column is controlled at 25~40 DEG C.
Preferably, the rare earth oxide is La2O3、Pr7O11、Ce2O3、Nd2O3、Sm2O3、Eu2O3、Gd2O3、 Tb4O7、Dy2O3、Ho2O3、Er2O3、Tm2O3、Yb2O3、Lu2O3、YO3And Sc2O3One or more of combination.
Preferably, the rare earth oxide is La2O3Or Nd2O3Or La2O3And Nd2O3Composite oxides.
Main component in the electrolysis tail gas of molten-salt electrolysis rare earth metal and alloy is CO2, fluoro-gas and a small amount of fluorination Composition granule.Wherein fluoride particles pass through cyclone dust removal, largely settle down, small part enters eluting column with gas In, it settles down by spray.Fluoro-gas and CO2Rare earth fluoride can be generated with rare earth oxide reactant aqueous solution and carbonic acid is dilute Soil, reaction equation are as follows:
RE(OH)3+3HF→REF3↓+3H2O
2RE(OH)3+3CO2→RE2(CO3)3↓+3H2O
4RE(OH)3+3CF4→4REF3↓+6H2O+3CO2
The present invention is using rare earth aqueous slkali as absorbing medium, and compared to acid solution, absorption efficiency is higher；Utilize rare earth oxygen Compound replaces limewash or sodium hydrate aqueous solution to carry out absorption processing to electrolysis tail gas, generates rare earth fluoride.
The post-treated raw material that can be used as of above-mentioned rare earth fluoride is applied directly in molten-salt electrolysis system, improves resource Utilization rate reduces production cost.
It can also be placed in exhaust chimney using solid rare earth oxide or hydroxide as filler simultaneously, further Remaining fluorinated tail gas is absorbed, reaches the fluorinated volume reduced in electrolysis tail gas, realizes the purpose of environmentally protective electrolysis.
Specific embodiment
Following embodiment is merely to illustrate the present invention, but does not limit the scope of the invention.
Rare earth oxide used in embodiment are as follows: La2O3、Pr7O11、Ce2O3、Nd2O3、Sm2O3、Eu2O3、Gd2O3、 Tb4O7、Dy2O3、Ho2O3、Er2O3、Tm2O3、Yb2O3、Lu2O3、YO3And Sc2O3One or more of combination.
Rare-earth hydroxide used are as follows: above-mentioned rare earth oxide reacts the rare-earth hydroxide generated, reaction side with water Formula is as follows:
RE2O3+3H2O→2RE(OH)3
The preparation method of rare-earth hydroxide powder is: by above-mentioned rare-earth hydroxide at 30~250 DEG C heating and thermal insulation 1 To 8 hours, rare-earth hydroxide powder can be obtained.
Embodiment one
The electrolysis tail gas absorption method of a kind of environmentally protective molten-salt electrolysis rare earth metal and alloy, steps are as follows:
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, the reaction in eluting column Temperature control at 25 DEG C, further settle tail gas one in particulate matter, and with the fluoro-gas and CO in tail gas one2Reaction generates Rare earth fluoride precipitating, forms recovered liquid and tail gas two.
Main component in the electrolysis tail gas of molten-salt electrolysis rare earth metal and alloy is CO2, fluoro-gas and a small amount of fluorination Composition granule.Wherein fluoride particles pass through cyclone dust removal, largely settle down, small part enters eluting column with gas In, it settles down by spray.Fluoro-gas and CO2Rare earth fluoride can be generated with rare earth oxide reactant aqueous solution and carbonic acid is dilute Soil, reaction equation are as follows:
RE(OH)3+3HF→REF3↓+3H2O
2RE(OH)3+3CO2→RE2(CO3)3↓+3H2O
4RE(OH)3+3CF4→4REF3↓+6H2O+3CO2
Embodiment two
The present embodiment includes all the elements of embodiment one, specifically: the reaction temperature in eluting column is controlled at 40 DEG C.
Embodiment three
The present embodiment includes all the elements of embodiment one, specifically: the reaction temperature in eluting column is controlled at 0 DEG C.
Example IV
The present embodiment includes all the elements of embodiment one, specifically: the reaction temperature in eluting column is controlled at 60 DEG C.
Embodiment five
The present embodiment includes all the elements of embodiment one, specifically: the reaction temperature in eluting column is controlled at 30 DEG C.
Embodiment six
The present embodiment includes all the elements of embodiment one, specifically: the reaction temperature in eluting column is controlled at 32 DEG C.
Embodiment seven
The electrolysis tail gas absorption method of a kind of environmentally protective molten-salt electrolysis rare earth metal and alloy, steps are as follows:
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, the reaction in eluting column Temperature control at 26 DEG C, further settle tail gas one in particulate matter, and with the fluoro-gas and CO in tail gas one2Reaction generates Rare earth fluoride precipitating, forms recovered liquid and tail gas two；
S3. solid-state rare earth oxide or solid-state rare-earth hydroxide are made into filler in exhaust chimney, by two row of tail gas Enter in exhaust chimney, the fluoro-gas in tail gas two is further absorbed, reaction generates rare earth fluoride solid, reaction Equation is as follows:
RE2O3(Gu)+6HF (gas) → 2REF3+3H2O
RE(OH)3(Gu)+3HF (gas) → REF3+3H2O
Embodiment eight
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, the reaction in eluting column Temperature control at 35 DEG C, further settle tail gas one in particulate matter, and with the fluoro-gas and CO in tail gas one2Reaction generates Rare earth fluoride precipitating, forms recovered liquid and tail gas two；
S3. solid-state rare earth oxide or solid-state rare-earth hydroxide are made into filler in exhaust chimney, by two row of tail gas Enter in exhaust chimney, the fluoro-gas in tail gas two is further absorbed, reaction generates rare earth fluoride solid；
S4. after producing a cycle, the filler in chimney is replaced, to guarantee absorption of the filler to fluoro-gas Ability.
Embodiment nine
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, the reaction in eluting column Temperature control at 28 DEG C, further settle tail gas one in particulate matter, and with the fluoro-gas and CO in tail gas one2Reaction generates Rare earth fluoride precipitating, forms recovered liquid and tail gas two；
S3. solid-state rare earth oxide or solid-state rare-earth hydroxide are made into filler in exhaust chimney, by two row of tail gas Enter in exhaust chimney, the fluoro-gas in tail gas two is further absorbed, reaction generates rare earth fluoride solid；
S4. after producing a cycle, the filler in chimney is replaced, to guarantee absorption of the filler to fluoro-gas Ability；
S5. recovered liquid is subjected to filters pressing, drying and washing, forms rare earth fluoride solid.
Embodiment ten
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, the reaction in eluting column Temperature control at 40 DEG C, further settle tail gas one in particulate matter, and with the fluoro-gas and CO in tail gas one2Reaction generates Rare earth fluoride precipitating, forms recovered liquid and tail gas two；
S3. solid-state rare earth oxide or solid-state rare-earth hydroxide are made into filler in exhaust chimney, by two row of tail gas Enter in exhaust chimney, the fluoro-gas in tail gas two is further absorbed, reaction generates rare earth fluoride solid；
S4. after producing a cycle, the filler in chimney is replaced, to guarantee absorption of the filler to fluoro-gas Ability；
S5. recovered liquid is subjected to filters pressing, drying and washing, forms rare earth fluoride solid；
S6. it is added to the rare earth fluoride solid in S2 and S5 as electrolysis raw material in electrolytic furnace.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (9)

1. the electrolysis tail gas absorption method of a kind of environmentally protective molten-salt electrolysis rare earth metal and alloy, it is characterised in that: step is such as Under:
S1. electrolysis tail gas is discharged into cyclone dust collector, Fluoride Factors in Tail Gas particle is removed, form tail gas one；
S2. tail gas one is discharged into eluting column, sprays tail gas one using the aqueous solution of rare earth oxide, further settles in tail gas one Particulate matter, and with the fluoro-gas and CO in tail gas one2Reaction generates rare earth fluoride precipitating, forms recovered liquid and tail gas two.
2. the electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal according to claim 1 and alloy, It is characterized in that: further including step S3, solid-state rare earth oxide or solid-state rare-earth hydroxide are made into filler in exhaust chimney, Tail gas two is discharged into exhaust chimney, the fluoro-gas in tail gas two is further absorbed, reaction generates rare earth fluorination Object solid.
3. the electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal according to claim 2 and alloy, It is characterized in that: further including step S4, after producing a cycle, the filler in chimney is replaced.
4. the electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal according to claim 3 and alloy, It is characterized in that: further including step S5, recovered liquid is subjected to filters pressing, drying and washing, forms rare earth fluoride solid.
5. the electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal according to claim 4 and alloy, It is characterized in that: further including step S6, be added to rare earth fluoride solid in S2 and S4 as electrolysis raw material in electrolytic furnace.
6. the electrolysis tail of environmentally protective molten-salt electrolysis rare earth metal as claimed in any of claims 1 to 5 and alloy Aspiration receiving method, it is characterised in that: the reaction temperature in eluting column is controlled at 0~60 DEG C.
7. the electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal according to claim 6 and alloy, Be characterized in that: the reaction temperature in eluting column is controlled at 25~40 DEG C.
8. the electrolysis tail of environmentally protective molten-salt electrolysis rare earth metal as claimed in any of claims 1 to 5 and alloy Aspiration receiving method, it is characterised in that: the rare earth oxide is La2O3、Pr7O11、Ce2O3、Nd2O3、Sm2O3、Eu2O3、 Gd2O3、Tb4O7、Dy2O3、Ho2O3、Er2O3、Tm2O3、Yb2O3、Lu2O3、YO3And Sc2O3One or more of combination.
9. the electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal according to claim 8 and alloy, Be characterized in that: the rare earth oxide is La2O3Or Nd2O3Or La2O3And Nd2O3Composite oxides.
CN201811457197.6A 2018-11-30 2018-11-30 A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy Pending CN109569236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811457197.6A CN109569236A (en) 2018-11-30 2018-11-30 A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811457197.6A CN109569236A (en) 2018-11-30 2018-11-30 A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy

Publications (1)

Publication Number Publication Date
CN109569236A true CN109569236A (en) 2019-04-05

Family

ID=65926368

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811457197.6A Pending CN109569236A (en) 2018-11-30 2018-11-30 A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy

Country Status (1)

Country Link
CN (1) CN109569236A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336591B2 (en) * 1986-06-16 1991-05-31 Asahi Engineering
EP0191893B1 (en) * 1985-02-21 1991-11-06 Asahi Kasei Kogyo Kabushiki Kaisha Process for adsorption treatment of dissolved fluorine
CN205517150U (en) * 2016-04-14 2016-08-31 赣州三友稀土新材料有限公司 Electrolysis rare earth metal tail gas processing apparatus
CN108654347A (en) * 2018-04-17 2018-10-16 江苏金石稀土有限公司 A kind of method that fluoride system electrolysis rare earth waste gas recovery utilizes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191893B1 (en) * 1985-02-21 1991-11-06 Asahi Kasei Kogyo Kabushiki Kaisha Process for adsorption treatment of dissolved fluorine
JPH0336591B2 (en) * 1986-06-16 1991-05-31 Asahi Engineering
CN205517150U (en) * 2016-04-14 2016-08-31 赣州三友稀土新材料有限公司 Electrolysis rare earth metal tail gas processing apparatus
CN108654347A (en) * 2018-04-17 2018-10-16 江苏金石稀土有限公司 A kind of method that fluoride system electrolysis rare earth waste gas recovery utilizes

Similar Documents

Publication Publication Date Title
CN100443412C (en) Method for treating tail gas and waste water from rare earth finished ore acid method burning process
CN1286995C (en) Mixed rare earth concentrate decomposition method
CN209124595U (en) A kind of aluminium ash harmless treatment device
CN104384167A (en) Comprehensive recycling method for waste titanium based vanadium SCR catalyst
CN103991894A (en) Preparation method for active copper oxide
CN105112938B (en) A kind of method of volatilization defluorinate in aluminium electrolytic charcoal material
CN108654347A (en) A kind of method that fluoride system electrolysis rare earth waste gas recovery utilizes
CN204529994U (en) The treatment unit of waste cathode carbon block in electrolysis of aluminum waste tank lining
CN105274341A (en) Method for leaching metallic vanadium and metallic tungsten in waste selective catalytic reduction (SCR) denitration catalyst
CN105603459A (en) Rare-earth electrolysis fume cleaning system and method
CN111204791B (en) Method for promoting rare earth carbonate to be converted into rare earth fluoride and recycling ammonia water
CN106552507A (en) HF, SO in electrolytic aluminum smoke is removed simultaneously using electrolysis aluminium ash and aluminium slag2Method
CN103818969A (en) Iron oxide red and preparation method thereof
CN103343236A (en) Method for recovering titanium, vanadium and tungsten from waste denitration catalyst
WO2022042632A1 (en) System for comprehensive recovery of metal resources in fly ash by molten salt electrolysis
WO2021190026A1 (en) System for capturing semi-volatile heavy metal in zinc-containing solid waste by means of high-temperature separation in cooperation with ammonium complexing
CN110148802A (en) A method of anode material of lithium battery and aluminium foil are discarded using red-mud separation
CN1317361A (en) Process for purifying fume from calcining furnace of aluminium electrolyzing anode
CN102258937B (en) Method for producing manganese sulfate by cyclically utilizing low-concentration sulfur dioxide smoke in aluminum electrolysis cell
CN103588220A (en) Acid-base combined production technology for preparing ammonia and hydrochloric acid by ammonium chloride decomposition and system
CN107840357A (en) A kind of method that ice crystal is produced using cell cathode carbon block alkaline leaching liquid
CN109569236A (en) A kind of electrolysis tail gas absorption method of environmentally protective molten-salt electrolysis rare earth metal and alloy
CN103111279B (en) LiBH 4the nanometer boride catalyst of based hydrogen storage material and preparation thereof, application
CN105803187A (en) Microwave-assisted decomposition method for Baotou mixed rare earth concentrates
CN104056523A (en) System for processing exhaust gas of rare earth electrolysis process

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20190405