CN107904399A - A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging - Google Patents

A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging Download PDF

Info

Publication number
CN107904399A
CN107904399A CN201711230681.0A CN201711230681A CN107904399A CN 107904399 A CN107904399 A CN 107904399A CN 201711230681 A CN201711230681 A CN 201711230681A CN 107904399 A CN107904399 A CN 107904399A
Authority
CN
China
Prior art keywords
flow
extraction
control
solution
rare earth
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
CN201711230681.0A
Other languages
Chinese (zh)
Inventor
韦世强
娄战荒
吴忠何
张亮久
莫国荣
蒋超超
梁壮
卢阶主
龙江志
杨振强
杨金涛
庄辉
羊多彦
李飞龙
况涛
许旭升
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.)
Chalco Guangxi Guosheng Rare Earth Development Co Ltd
Original Assignee
Chalco Guangxi Guosheng Rare Earth Development 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 Chalco Guangxi Guosheng Rare Earth Development Co Ltd filed Critical Chalco Guangxi Guosheng Rare Earth Development Co Ltd
Priority to CN201711230681.0A priority Critical patent/CN107904399A/en
Publication of CN107904399A publication Critical patent/CN107904399A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/26Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/02Apparatus therefor
    • 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging, its concrete operation step includes:(1) rare earth feed liquid is filled from material storage and is transported to by feed liquid delivery pump in extraction tank;(2) flow of rare earth feed liquid is controlled by flow measurement control device;(3) deliver water into extraction tank, the flow of water is controlled by flow measurement control device;(4) sour regurgitation solution will be washed to be sent in extraction tank from material storage implantation, the flow of sour regurgitation solution is washed by the control of flow measurement control device;(5) rare earth feed liquid, water, wash sour regurgitation solution extraction process realized in extraction tank;(6) rare earth feed liquid, water, the beginning and stopping for washing the conveying of sour regurgitation solution are controlled by the indoor control system of Shop floor control, and realizes real time monitoring flow.Measurement result accuracy of the present invention, precision are obviously improved, and are relatively stablized;The workload of measurement calibration is greatly reduced, production cost is reduced, improves production efficiency.

Description

A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging
Technical field
The present invention relates to rare earth extraction separation technology field, is realized more particularly to a kind of Rare Earths Countercurrent Extraction Process automatic Change the method for charging.
Background technology
Rare earth is known as " treasure-house " of new material, is industrial " monosodium glutamate ", due to the importance of rare earth material, causes The extensive concern of World Science circle and attention.China is the country that rare earth resources are most abundant in the world, and rare earth reserves and yield are equal Rank first in the world, while also possess advanced extraction and separation technology.But China rare earth application aspect have compared with external compared with Big gap, especially because extraction equipment relatively falls behind, automatization level is relatively low, causes rare earth element direct yield and dilute Native produce purity is lower than developed country.
Hydrometallurgical technology is widely used in rare-earth smelting, mainly includes the following steps that:(1) with solvent by raw material Useful component is transferred to solution, that is, leaches;(2) leaching solution separated with residue, while by the solvent for metallurgy become entrained in residue with Metal ion recycles;(3) purification and enrichment of solution are leached, commonly uses ion exchange and solvent extraction technology or other chemical precipitations Method:(4) metal or compound are extracted from scavenging solution.Rare-earth smelting process largely carries out in solution and solvent, By the Chemical Decomposition technique Extraction of rare earth element such as solvent extraction, ion exchange, UF membrane, then by precipitation, crystallization, oxidation also The processes such as original obtain rare-earth oxide.
In the hydrometallurgical technology of rare earth to use extraction and separation technology, wherein solvent extraction is a kind of important change more Work separation means, it has also become the main means of domestic and international Rare Earth Separation.In rare earth extraction separation production process, accurate control is respectively given Stream amount is to ensure the basis of production line continuous-stable output qualified products.It is typically all to pass through at present for each feed flow The flow of each component is manually calculated, or uses scoop-like volume control device or rotary table feeder, to realize raw material Proportioning process, but it is usually present the problem of control accuracy is not high, unstable, and measurement calibration amount is big.
The content of the invention
Present invention aims at the method that a kind of Rare Earths Countercurrent Extraction Process of offer realizes automation charging, by extracting Volume control device, magnetic-float type liquid level meter are added in groove, measurable flow can also carry out regulation and control according to default value to be made Flow number stabilization is obtained near setting value, and flow accuracy is attained by production control needs, to solve control accuracy not It is high, unstable, measure the problem of calibration amount is big.
The present invention is that technical solution is used by solving above-mentioned technical problem:A kind of Rare Earths Countercurrent Extraction Process is realized certainly The method of dynamicization charging, its concrete operation step include:
(1) rare earth feed liquid is filled from material storage and is transported to by feed liquid delivery pump in extraction tank;
(2) flow of rare earth feed liquid is controlled by flow measurement control device, is adjusted according to the flow speed value of default Control causes flow number stabilization near setting value;
(3) deliver water into extraction tank, the flow of water is controlled by flow measurement control device, according to default value Regulation and control are carried out so that flow number stabilization is near setting value;
(4) sour regurgitation solution will be washed to be sent in extraction tank from material storage implantation, washed by the control of flow measurement control device anti- The flow of acid solution, carries out regulation and control so that flow number stabilization is near setting value according to the flow speed value of default;
(5) rare earth feed liquid, water, wash sour regurgitation solution extraction process realized in extraction tank;
(6) rare earth feed liquid, water controlled by the indoor control system of Shop floor control, wash the beginning of sour regurgitation solution conveying with stopping Only, and realization monitors flow in real time.
Further, the rare earth feed liquid in step (1) is continuously added to from the 8th grade of extraction tank.
Further, the water in step (3) is continuously added to from the first order of extraction tank.
Further, the sour regurgitation solution of washing in step (4) is continuously added to from the tenth three-level of extraction tank.
Further, the material storage tank in step (1) and (4) is equipped with magnetic-float type liquid level meter.
Further, the flow measurement control device in step (2), (3), (4) is connected with management system, is set by computer Install definite value.
Further, flow measurement control device is intelligent liquid turbine flowmeter.
Further, the rare earth feed liquid in step (1), (2), (5) includes carbonated rare earth solution, re chloride and sulphur Acid rare earth solution.
Further, in step (3), (4), (5) wash sour regurgitation solution include carbon acid solution, hydrochloric acid solution and sulfuric acid it is molten Liquid.
Further, magnetic-float type liquid level meter can also be installed on the material in the precipitation process or calcination process of rare earth Storage tank.
The beneficial effect that the present invention is compared with the prior art includes:
(1) from the test data of embodiment 1~3, realized certainly using Rare Earths Countercurrent Extraction Process provided by the invention The method of dynamicization charging, is compared with default value, and earth solution, water, wash the flow measurement of sour regurgitation solution all relatively surely It is fixed, accurate, precision is high, error in reading scope be less than 1%, meet production run be less than 5% precision controlling requirement.
(2) from the data of embodiment 1~3 and comparative example 1~3, to earth solution, water, wash sour regurgitation solution and use people The result fluctuation range that work measuring method obtains is big, hence it is evident that deviates setting value;Understand, utilize rare earth extraction provided by the invention point From the method that process realizes automation charging, obtained measurement result accuracy, precision are significantly lifted, and are relatively stablized.
(3) magnetic-float type liquid level meter carries out interlocked control with feed liquid delivery pump and can realize material during production run The accurate quantification control of transhipment, not only saves human input, and the statistical report form for putting into and using is more precisely and convenient.
(4) method that automation charging is realized using Rare Earths Countercurrent Extraction Process provided by the invention, greatly reduces survey The workload of calibration is measured, production cost is reduced, improves production efficiency.
Embodiment
For ease of more fully understanding the present invention, it is illustrated by following instance, these examples belong to the protection of the present invention Scope, but do not limit the scope of the invention.
Embodiment 1
A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging, concrete operation step include:
(1) carbonated rare earth solution is filled from material storage and is transported to by feed liquid delivery pump in extraction tank;
(2) by flow measurement control device control carbonated rare earth solution flow, according to the flow speed value of default into Row regulation and control cause flow number stabilization near setting value;
(3) deliver water into extraction tank, the flow of water is controlled by flow measurement control device, according to default value Regulation and control are carried out so that flow number stabilization is near setting value;
(4) carbon acid solution is sent in extraction tank from material storage implantation, controls carbonic acid molten by flow measurement control device The flow of liquid, carries out regulation and control so that flow number stabilization is near setting value according to the flow speed value of default;
(5) carbonated rare earth solution, water, carbon acid solution realize extraction process in extraction tank;
(6) by the indoor control system of Shop floor control control the beginning that carbonated rare earth solution, water, carbon acid solution convey with Stop, and realize real time monitoring flow.
The carbonated rare earth solution is continuously added to from the 8th grade of extraction tank.
The water is continuously added to from the first order of extraction tank.
The carbon acid solution is continuously added to from the tenth three-level of extraction tank.
The material storage tank is equipped with magnetic-float type liquid level meter.
The flow measurement control device is connected with management system, and setting value is set by computer.
The flow measurement control device is intelligent liquid turbine flowmeter.
Embodiment 2
A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging, concrete operation step include:
(1) re chloride is filled from material storage and is transported to by feed liquid delivery pump in extraction tank;
(2) by flow measurement control device control re chloride flow, according to the flow speed value of default into Row regulation and control cause flow number stabilization near setting value;
(3) deliver water into extraction tank, the flow of water is controlled by flow measurement control device, according to default value Regulation and control are carried out so that flow number stabilization is near setting value;
(4) hydrochloric acid solution is sent in extraction tank from material storage implantation, controls hydrochloric acid molten by flow measurement control device The flow of liquid, carries out regulation and control so that flow number stabilization is near setting value according to the flow speed value of default;
(5) re chloride, water, hydrochloric acid solution realize extraction process in extraction tank;
(6) by the indoor control system of Shop floor control control the beginning that re chloride, water, hydrochloric acid solution convey with Stop, and realize real time monitoring flow.
The re chloride is continuously added to from the 8th grade of extraction tank.
The water is continuously added to from the first order of extraction tank.
The hydrochloric acid solution is continuously added to from the tenth three-level of extraction tank.
The material storage tank is equipped with magnetic-float type liquid level meter.
The flow measurement control device is connected with management system, and setting value is set by computer.
The flow measurement control device is intelligent liquid turbine flowmeter.
Embodiment 3
A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging, concrete operation step include:
(1) rare earth sulfate solution is filled from material storage and is transported to by feed liquid delivery pump in extraction tank;
(2) by flow measurement control device control rare earth sulfate solution flow, according to the flow speed value of default into Row regulation and control cause flow number stabilization near setting value;
(3) deliver water into extraction tank, the flow of water is controlled by flow measurement control device, according to default value Regulation and control are carried out so that flow number stabilization is near setting value;
(4) sulfuric acid solution is sent in extraction tank from material storage implantation, controls sulfuric acid molten by flow measurement control device The flow of liquid, carries out regulation and control so that flow number stabilization is near setting value according to the flow speed value of default;
(5) rare earth sulfate solution, water, sulfuric acid solution realize extraction process in extraction tank;
(6) by the indoor control system of Shop floor control control the beginning that rare earth sulfate solution, water, sulfuric acid solution convey with Stop, and realize real time monitoring flow.
The rare earth sulfate solution is continuously added to from the 8th grade of extraction tank.
The water is continuously added to from the first order of extraction tank.
The sulfuric acid solution is continuously added to from the tenth three-level of extraction tank.
The material storage tank is equipped with magnetic-float type liquid level meter.
The flow measurement control device is connected with management system, and setting value is set by computer.
The flow measurement control device is intelligent liquid turbine flowmeter.
Comparative example 1
It is essentially identical with the raw material and preparation method of embodiment 1, have only the difference is that using manual measurement method.
Comparative example 2
It is essentially identical with the raw material and preparation method of embodiment 2, have only the difference is that using manual measurement method.
Comparative example 3
It is essentially identical with the raw material and preparation method of embodiment 3, have only the difference is that using manual measurement method.
Wherein, by embodiment 1~3 and comparative example 1~3 in relation to earth solution, water, the measurement data difference for washing sour regurgitation solution It is listed in Table 1.
1 embodiment 1~3 of table and the contrast of 1~3 flow measuring data of comparative example
Earth solution (L/min) Water (L/min) Wash sour regurgitation solution (L/min)
Default value 10.00 4.50 9.50
Embodiment 1 9.96 4.56 9.51
Embodiment 2 10.08 4.49 9.45
Embodiment 3 9.94 4.43 9.57
Comparative example 1 10.53 4.26 9.95
Comparative example 2 10.47 4.79 9.13
Comparative example 3 9.56 4.24 9.98
As shown in Table 1:
(1) from the test data of embodiment 1~3, realized certainly using Rare Earths Countercurrent Extraction Process provided by the invention The method of dynamicization charging, is compared with default value, and earth solution, water, wash the flow measurement of sour regurgitation solution all relatively surely It is fixed, accurate, precision is high, error in reading scope be less than 1%, meet production run be less than 5% precision controlling requirement;
(2) from the data of embodiment 1~3 and comparative example 1~3, to earth solution, water, wash sour regurgitation solution and use people The result fluctuation range that work measuring method obtains is big, hence it is evident that deviates setting value;Understand, utilize rare earth extraction provided by the invention point From the method that process realizes automation charging, obtained measurement result accuracy, precision are significantly lifted, and are relatively stablized.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging, it is characterised in that:Its concrete operation step includes:
(1) rare earth feed liquid is filled from material storage and is transported to by feed liquid delivery pump in extraction tank;
(2) flow of rare earth feed liquid is controlled by flow measurement control device, carrying out regulation and control according to the flow speed value of default makes Flow number stabilization is obtained near setting value;
(3) deliver water into extraction tank, the flow of water is controlled by flow measurement control device, is carried out according to default value Regulation and control cause flow number stabilization near setting value;
(4) sour regurgitation solution will be washed to be sent in extraction tank from material storage implantation, it is molten to wash sour regurgitation by the control of flow measurement control device The flow of liquid, carries out regulation and control so that flow number stabilization is near setting value according to the flow speed value of default;
(5) rare earth feed liquid, water, wash sour regurgitation solution extraction process realized in extraction tank;
(6) rare earth feed liquid, water, the beginning and stopping for washing the conveying of sour regurgitation solution are controlled by the indoor control system of Shop floor control, And realize real time monitoring flow.
2. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the rare earth feed liquid in (1) is continuously added to from the 8th grade of extraction tank.
3. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the water in (3) is continuously added to from the first order of extraction tank.
4. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the sour regurgitation solution of washing in (4) is continuously added to from the tenth three-level of extraction tank.
5. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the material storage tank in (1) and (4) is equipped with magnetic-float type liquid level meter.
6. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the flow measurement control device in (2), (3), (4) is connected with management system, and setting value is set by computer.
7. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 6 realizes automation charging, it is characterised in that the stream Gauge amount control device is intelligent liquid turbine flowmeter.
8. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the rare earth feed liquid in (1), (2), (5) includes carbonated rare earth solution, re chloride and rare earth sulfate solution.
9. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 1 realizes automation charging, it is characterised in that the step Suddenly the sour regurgitation solution of washing in (3), (4), (5) includes carbon acid solution, hydrochloric acid solution and sulfuric acid solution.
10. the method that Rare Earths Countercurrent Extraction Process as claimed in claim 5 realizes automation charging, it is characterised in that described Magnetic-float type liquid level meter can also be installed on the material storage tank in the precipitation process or calcination process of rare earth.
CN201711230681.0A 2017-11-29 2017-11-29 A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging Pending CN107904399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711230681.0A CN107904399A (en) 2017-11-29 2017-11-29 A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711230681.0A CN107904399A (en) 2017-11-29 2017-11-29 A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging

Publications (1)

Publication Number Publication Date
CN107904399A true CN107904399A (en) 2018-04-13

Family

ID=61849488

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711230681.0A Pending CN107904399A (en) 2017-11-29 2017-11-29 A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging

Country Status (1)

Country Link
CN (1) CN107904399A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111142582A (en) * 2020-01-13 2020-05-12 东北大学 Intelligent control system of rare earth extraction production process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201386130Y (en) * 2009-04-29 2010-01-20 内蒙古包钢稀土高科技股份有限公司 Automatic control device for rare earth extraction separation production
CN202849519U (en) * 2012-09-27 2013-04-03 信丰县包钢新利稀土有限责任公司 Rare earth extraction separation control device
CN104480305A (en) * 2014-10-16 2015-04-01 福建省长汀金龙稀土有限公司 An organic matter recovery process in a rare earth extraction separating process
CN106502225A (en) * 2016-11-10 2017-03-15 中铝广西国盛稀土开发有限公司 The information gathering of Rare Earth Production process materials and analysis intelligence control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201386130Y (en) * 2009-04-29 2010-01-20 内蒙古包钢稀土高科技股份有限公司 Automatic control device for rare earth extraction separation production
CN202849519U (en) * 2012-09-27 2013-04-03 信丰县包钢新利稀土有限责任公司 Rare earth extraction separation control device
CN104480305A (en) * 2014-10-16 2015-04-01 福建省长汀金龙稀土有限公司 An organic matter recovery process in a rare earth extraction separating process
CN106502225A (en) * 2016-11-10 2017-03-15 中铝广西国盛稀土开发有限公司 The information gathering of Rare Earth Production process materials and analysis intelligence control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111142582A (en) * 2020-01-13 2020-05-12 东北大学 Intelligent control system of rare earth extraction production process
CN111142582B (en) * 2020-01-13 2021-04-13 东北大学 Intelligent control system of rare earth extraction production process

Similar Documents

Publication Publication Date Title
CN204656736U (en) A kind of flotation automatically adding medicine machine
CN107188215A (en) The method that reaction end is automatically adjusted in carbonated rare earth continuous precipitation production process
CN105648232B (en) One kind uses I2The method that gold refining is carried out with KI
CN107904399A (en) A kind of method that Rare Earths Countercurrent Extraction Process realizes automation charging
CN103435016B (en) A kind of method extracting selenium from acid mud
CN105838900B (en) One kind uses I2The method that gold refining is carried out with NaI
CN103643256B (en) Manganese sulphate solution deep-purifying method in a kind of manganese metal production
CN103435080A (en) Method for extracting and de-ironing aluminum chloride slurry
CN206736321U (en) A kind of device for being used to continuously produce rare earth compound precipitation
CN105950866B (en) A kind of zinc liquid purification copper removal procedure optimization control method based on oxidation-reduction potential
CN104353375A (en) Automatic preparing device and method for organic saponification alkaline liquor in rare earth wet-process smelting process
CN110793328B (en) Sintering distributor blanking direction calculation system and control method
CN205056143U (en) Phosphoric acid by wet process ore grinding system
CN205046220U (en) Non -cyanide plating copper solution apparatus for producing
CN105274336A (en) Method for stabilizing leaching solution in calcification vanadium extraction process
CN109917740A (en) A kind of chlorine oxidation removal of impurities intelligence control system and control method
CN105404147B (en) A kind of self-optimizing control method of hydrometallurgy gold cyanidation-leaching process
CN204779647U (en) Automatic water installation that adds in grey storehouse removes dust
CN101709391B (en) Method for producing electrolytic manganese metal by lixiviating sinter ore by adding ferrous sulphate in replacement of manganese carbonate ore
CN202849519U (en) Rare earth extraction separation control device
CN205024291U (en) Vanadium device is carried in acidleach of substep formula
CN203728905U (en) Oxygen adding system for iron removal of reactor
CN211497737U (en) Continuous uniform acid leaching device for oxidized ore
CN203768427U (en) Constant flow rate control device for rare earth extracting solution
CN214765257U (en) Automatic preparation device for dilute sulfuric acid

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: 20180413