CN101372727A - Method for extracting valuable metal from hyper-accumulator - Google Patents
Method for extracting valuable metal from hyper-accumulator Download PDFInfo
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- CN101372727A CN101372727A CNA2008101433245A CN200810143324A CN101372727A CN 101372727 A CN101372727 A CN 101372727A CN A2008101433245 A CNA2008101433245 A CN A2008101433245A CN 200810143324 A CN200810143324 A CN 200810143324A CN 101372727 A CN101372727 A CN 101372727A
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- 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
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Abstract
The invention relates to a method for extracting valuable metals from hyper-accumulators to achieve the purpose of optmized use of hyper-accumulator plants, comprising steps of burning, lixiviating, purifying, and electrodepositing or chemical precipitation of the harvested products of the hyper-accumulator plants. The innovation is that a technique of ammonia leaching, purifying, and electrochemical deposition or chemical precipitation is introduced into the treatment of the harvested products of the hyper-accumulator plants in the environmental engineering, and heavy metals in the harvested products of the hyper-accumulator plants are separated and extracted, thus realizing reduction and energy utilization of the harvested products of the hyper-accumulator plants, achieving the purpose of optimized use of each valuable metal in the harvested products of the hyper-accumulator plants. The invention has the advantages of great adaptability of raw materials and high recovery rate of heavy metals, at the same time, the integrity of phytoremediation can be guaranteed. By adopting the method, valuable resources from extraction of metals can be provided, furthermore, a unity of environmental benefits and economical benefits can be achieved.
Description
Technical field
The invention belongs to field of environment engineering, relate to a kind of valuable metal that from super enriching plant, extracts, to realize the method for super enriching plant recycling.
Background technology
Current, because the pollution of mining, Metal smelting and industrial sewage and mud is increased by the area of heavy-metal contaminated soil and degree just year by year.Along with increasing the weight of of heavy metal pollution of soil, agricultural cultivated area falls sharply, and the soil quality in a great deal of farmland also descends day by day.Particularly serious is that toxic heavy metal produced pollution in soil system has the characteristics of disguise, chronicity and non-reversibility.The heavy metal element that enters soil does not show the harm to environment and crop in a specified time, but when its accumulation volume surpasses soil ability to bear or volume weight of soils, will produce crop and human body endanger, thereby cause serious ecological problem.
Traditional soil pollution improvement method mainly contains the engineering measure based on mechanical-physical or physical and chemical principle, comprises soil moved in to improve the original soil replacement method, isolation method, washing out method, heat treating process, electrochemical process etc.; Based on the ameliorative measure of pollutent soil geochemistry behavior, reduce water-soluble, the diffustivity and the biological effectiveness of soil pollutant as adding modifying agent, inhibitor, with of the harm of pollution abatement thing to ecotope.The engineering science method that soil pollution is administered often needs contaminated soil is dug the fortune aftertreatment, and is not only expensive big, and destroys soil microorganisms and Soil structure.Therefore, traditional improvement method can not solve heavy metal contamination effectively.In recent years, phytoremediation technology (Phytoremediation) has become focus, and its mechanism is that plant has special absorbing enriched ability to the pollution element in the soil.
Through development in recent years, phytoremediation technology is with the original position of permanent, the governance process of its regulation effect, the cheap property of administering wood and the characteristics such as compatibility of the aesthetics of environment, develop into one of main path of soil pollution improvement gradually, and begin to enter the industrialization initial stage.Herba pteridis vittatae (enrichment arsenic), Berkheya coddii (enriching nickel), Sedum alfredii Hance (enrichment zinc), Brassicacam pestris multiple super enriching plants such as (enriched lead or cadmiums) have also been found in China native country.Meanwhile, the document that relates to the super enriching plant content both at home and abroad also increases rapidly.But from the document of having delivered at present, prior art mainly concentrates on screening, the huge legendary turtle of super enriching plant and closes reparation, the reinforcement of inoculation mycorhiza, gene engineering, agronomy management and the field measure etc. of inducing.And the processing and the resource technology of the plant cutting behind the relevant restoration of soil polluted by heavy metal, domestic and international research is reported seldom, and all is breadboard simple exploration basically.Retrieve domestic and international patent documentation, the method for disposal of the plant cutting of having reported mainly contains: burning method, composting process, compression landfill method, high-temperature decomposition, ashing method and liquid-phase extraction method etc.
1) burning method: be a kind of high-temperature heat treatment technology, main purpose is to realize the minimizing to greatest extent of plant cutting, burn the also recyclable utilization of heat energy that produces, the key problem that needs at present to solve is " secondary pollution " that effectively prevents to contain the heavy metal flue dust, and the processing and the recycling of incineration residue (containing residual ash and flue dust).
2) composting process: be a kind of method of being engaged in the expert advice popularization of plant research, it mainly acts on biomass and the volume that reduces plant materials.But composting technology is not effectively removed heavy metal, only is to exist form that variation has taken place, and this only is a kind of transfer of pollutent undoubtedly.And after compost treatment, the water-soluble of heavy metal strengthens greatly, if mismanagement, easier causing " secondary pollution ".
3) compression landfill method: by compression system and filtrate collection device, realize the minimizing of plant cutting and effectively prevent the secondary pollution of heavy metal, report but Shang Weijian effectively handles the research of percolate method.
4) high-temperature decomposition: to the violent thermal treatment of plant, make plant a kind of treatment process of decomposition fast under high temperature and anaerobic conditions, this technology has had the demo plant of processing power 1200-1450kg/h at Greece Evritania.But the installation of great number, debugging and working cost are " bottlenecks " of this technology large-scale promotion application of restriction.
5) ashing method: its principle and purpose and burning method are similar, and main purpose is significantly to reduce the weight and volume of plant cutting, equally also face the handling problem of control burning process " secondary pollution " and residue.
6) liquid-phase extraction method: use a kind of highly effective chelating agent from the plant cutting, directly to extract a kind of method of heavy metal.From the hydrometallurgical technology development course, the application of abstraction technique in non-ferrous metal extracts is very extensive, the existing maturation process of the extraction of many non-ferrous metals (as Cu, Zn, Ni etc.).But the mechanism of action between the heavy metal in sequestrant and the plant awaits further research.
Realizing that super enriching plant cutting ground effectively handles and resource utilization, is that the phytoremediation technology system needs a perfect difficult point, also be phytoremediation technology in the industrial scale process, must face and press for one of key issue of solution.This be since the plant that has accumulated plurality of heavy metal tend to by rot, approach such as fallen leaves makes heavy metal element return to soil, therefore must gather in plant before plant defoliation, and with its timely harmless treatment.
Summary of the invention
The object of the present invention is to provide a kind of perfect brand-new combination process flow process of from super enriching plant, extracting valuable metal, to realize the super enriching plant recycling, it is too simple to remedy existing super enriching plant cutting treatment technology, easily causes deficiencies such as secondary pollution.
The objective of the invention is to realize in the following manner.
(1) the super enriching plant cutting is burned, form ash content;
(2) then above-mentioned burning ash content is added the ammonia leaching agent aqueous solution that ammonium salt and ammonia are made, in ammonia gonosome system, leach;
(3) leach liquor is carried out purification and impurity removal, scavenging solution is that anode carries out electrochemical deposition and produces metal target or obtain corresponding compounds by chemical precipitation with the inert material then; Electrolysis waste solution or post precipitation liquid return leaching after replenishing ammonia.
Described burning process, controlling the super enriching plant cutting respectively is 100～300 ℃ in the temperature of dryer section, the residence time on dryer section is 10～60min; Being controlled at the burning zone residence time is 10～100min, and the temperature that is controlled at burning zone is 300 ℃～700 ℃; The residence time that is controlled at the after-flame section is 30min～120min.
Described ammonia gonosome is NH
4Cl-NH
3-H
2O, (NH
4)
2SO
4-NH
3-H
2O, (NH
4)
2CO
3-NH
3-H
2O.
Described ammonia gonosome set member volumetric molar concentration is [NH
4 +]=2～8mol/L, [NH
3]=1～5mol/L, liquid-solid ratio=1～10:1,20～80 ℃ of extraction temperatures, extraction time 30min～540min.
The As/Sb that exists in the described leach liquor adopts the colloid coprecipitation method to remove; Other beavy metal impurity except that metal target removes by the metal replacement method.
To the described Fe that contains
2+Ash content when leaching, add the oxygenant deironing, oxygenant is H
2O
2, KMnO
4In one or both mixture.
Described scavenging solution carries out electrochemical deposition when producing metal target, and its bath voltage is 1.5～4.5V, is 3～15cm with pole span, cathode current density 100～1000A/m
2, 25～60 ℃ of electrodeposition temperature.
The anode material of described electrochemical deposition is high purity graphite or is coated with ruthenium titanium plate.
Characteristics of the present invention at first are that the super enriching plant cutting is burned.Then, incineration ashes is carried out the ammonia leaching; Leach liquor is carried out purification and impurity removal.At last, scavenging solution is that anode carries out electrochemical deposition with the inert material, obtains metal target contained in the super enriching plant cutting; Also can obtain corresponding compounds by chemical precipitation method.Concrete steps and principle are:
(1) burning process
Be present in heavy metal composition in the super enriching plant with various forms, will be after burning with MeO/Me (OH)
n/ Me (CO
3) n/Me (SO
4)
n/ MeCl
nBe present in the ash content of burning back etc. form.Burning facility is rotary kiln, fluidized-bed, stoker fired grate incinerator (grate incinerator etc. at the bottom of the German SITY of LMT 2000 stoker fired grate incinerators, the multistage burning grate incinerator of western Gus, the BABCOCK roller).
(2) leaching process
Earlier on request ammonium salt and ammonia are mixed with the leaching agent aqueous solution, super enriching plant cutting burning ash content are added in above-mentioned ammonium-ammonia-aqueous systems leach again.The super enriching plant cutting is after burning, and the wherein contained element that comprises heavy metal mostly exists with oxide form.In leaching process, the element of energy and ammonia formation title complex will be with Me (NH
3)
i N+Cooperate the ionic form to enter in the solution (leach liquor), comprise Cu, Cd, Co, Ni, Pb, As, Sb etc.
The principal reaction formula is as follows:
MeO+nNH
4 ++ (i-2) NH
3=Me (NH
3)
i N++ H
2The species of O to becoming the metal-salt form to exist, leach and react as follows:
Me(OH)
n+2NH
4 ++(i-2)NH
3＝Me(NH
3)
i n++2H
2O
Me(CO
3)
n+iNH
3＝Me(NH
3)
i 2n++nCO
3 2-
Me(SO
4)
n+iNH
3＝Me(NH
3)
i 2n++nSO
4 2-
MeCl
n+iNH
3＝Me(NH
3)
i n++nCl
-
In leaching process, the difference according to the kind of contained material in the super enriching plant cutting burning ash content need add oxygenant, sometimes as H
2O
2, KMnO
4, will contain Fe
2+Be oxidized to Fe
3+, so that remove.
(3) scavenging process
Generally speaking, burn in the ash content of gained in the super enriching plant cutting of certain heavy metal species except that the higher relatively heavy metal composition of a kind of content, also may also have other heavy metal composition to exist, these heavy metal compositions can both form Me (NH with ammonia greatly
3)
i N+, therefore, must add certain metal replacement and remove these foreign ions, as: usually add the zinc dust precipitation impurity element in operation, its chemical equation is as follows:
Zn+Me(NH
3)
j 2+＝Zn(NH
3)
i 2++Me+(j-i)NH
3
(4) electrochemical deposition process
During the scavenging solution electrochemical deposition, cathode material can adopt conventional aluminium sheet, or stainless steel plate, or the titanium plate, and anode material then should adopt inertia to reach the not material of polluted product, as: high purity graphite is coated with insoluble materials such as ruthenium titanium plate, to guarantee the quality of electrowinning.The electrochemical deposition process reaction is as follows:
Cathodic reaction: Me (NH
3)
i N++ ne=Me+iNH
3
Anodic reaction:
(1) adopts NH
4Cl-NH
3-H
2During the O system:
6Cl
--6e＝3Cl
2
3Cl
2+2NH
3＝N
2+6H
++6Cl
-
6H
++6NH
3＝6NH
4+
(2) adopt (NH
4)
2SO
4-NH
3-H
2O system, (NH
4)
2CO
3-NH
3-H
2During the O system:
2H
2O-4e＝4H
++O
2
3O
2+4NH
3＝2N
2+6H
2O
The current efficiency of electrochemical deposition process is usually greater than 90%, and generally about 95%, the ionic concn of metal target is usually greater than 10g/L in the electrolysis waste solution, and the electrodeposition waste liquid returns leaching process after replenishing ammonia again.
The present invention adopts " extraction of burning-ammonia and purification-electrochemical deposition/chemical precipitation method-metal/Chemicals " technical process, changed the secondary pollution that the imperfection of previous methods causes, and shortcoming such as complicated operation, technology are immature, cost consumption height, comprehensive exploitation goes out a kind of perfect brand-new combination process flow process, to realize the super enriching plant recycling.In addition, creationaryly ammonia is soaked-purify-electrochemical deposition/chemical precipitation technology is incorporated into the processing of super enriching plant cutting in the environmental engineering, makes can not form secondary pollution by heavy metal rate of recovery height, can guarantee the integrity of phytoremediation technology.This method implementation process is simple, and adaptability to raw material is strong, simultaneously, both can provide the valuable resource of METAL EXTRACTION, can reach the unification of environmental benefit and economic benefit again.
Embodiment
Following examples are intended to illustrate the present invention rather than the present invention are further limited.
Embodiment 1
Sedum alfredii Hance (the Sedum alfredii Hance) cutting that provides with south China Environmental Research Institute is that raw material carries out minimizing and recycling treatment.
Getting above-mentioned Sedum alfredii Hance cutting 50kg pushes in the German SITY of the LMT 2000 stoker fired grate incinerators.Controlling this cutting respectively is about 200 ℃ in the temperature of dryer section, and the residence time on dryer section is 20min; Be controlled at about 30min of burning zone residence time; Be controlled at about about 450 ℃ of the temperature of burning zone, be controlled at about 60min of residence time of after-flame section.Afterwards, take out burning ash content weighing and obtain ash content 301g, analyze wherein contained main component: Zn 6.2%, Pb1.01%, and Cu 0.235%, and Fe 1.2%, and Ca 13.8%, and Mg 0.865%, and Al 3.2%, and Na 0.43%, and S 0.663%, and P 0.598%
Adopt NH
4Cl-NH
3-H
2The O system leaches, and leaching agent is formed: [NH
4 +]=4.5mol/L, [NH
3]=2.5mol/L is measured leaching agent 2L, takes by weighing this burning ash content 300g, liquid-solid ratio 6:1, and extraction time 2 hours, 50 ℃ of extraction temperatures leach that to add content behind about 60min be 30% H
2O
25ml is with Fe wherein
2+Be oxidized to Fe
3+, reaction finishes the main heavy metal component content of post analysis leach liquor: Zn 8.9g/L, Cu 0.05g/L, Pb 0.06g/L.Extraordinarily go into zinc powder by 15 of plumbous theoretical amount during purification, carry out two sections adverse currents and purify, churning time 30min, temperature is 50 ℃.Scavenging solution graphite is anode electrode, and current density is 350A/m2, and with pole span 8cm, temperature is 25 ℃, bath voltage 3.2v, current efficiency 92.3%.The main component that obtains electric zinc is: Zn〉99.5%, impurity component content: Cu0.77ppm, Ni0.3ppm, Fe 1.5ppm, all the other equal＜0.5ppm of Pb 0.9ppm.Electrolysis waste solution returns leaching after replenishing ammonia.
Embodiment 2
Belonging to shellfish holder front yard mustard (Alyssum bertolonii) cutting with the front yard mustard that the Chinese Academy of Sciences was provided is that raw material carries out minimizing and recycling treatment.
Getting above-mentioned front yard mustard genus shellfish holder front yard mustard cutting 100kg pushes in the German SITY of the LMT 2000 stoker fired grate incinerators.Controlling this cutting respectively is about 250 ℃ in the temperature of dryer section, and the residence time on dryer section is 20min; Be controlled at about 30min of burning zone residence time; About 450 ℃ of temperature is controlled at about 50min of residence time of after-flame section.Afterwards, take out burning ash content weighing and obtain ash content 824g, analyze wherein contained main component: Ni 11.2%, and Pb 1.71%, and Cu 0.01%, Cd0.29%, Fe 12.2%, and Ca 19.6%, and Mg 0.365%, Al 2.4%, and Na 0.51%, and S 0.363%, and P 0.792%.
Adopt (NH
4)
2CO
3-NH
3-H
2The O system leaches, and joins [NH
4 +]=4mol/L, [NH
3The leaching agent 2L of]=4.0mol/L.Take by weighing this burning ash content 333g, liquid-solid ratio 3:1, extraction time 6 hours, 30 ℃ of extraction temperatures.Leach and finish post analysis leach liquor major metal component content: Ni26.6g/L, Cu 0.018g/L, Cd 0.52g/L, Pb 0.076g/L, wherein the leaching yield of nickel reaches 89.4%.The rich nickel solution of gained can obtain preparing the mother liquor of nickel salt after further purifying.About the pH value to 11 of this solution of raising, just can obtain solid Ni (OH)
2
Embodiment 3
Phytolacca acinosa (Phytolacca acinosa) cutting that is provided with Chinese Academy of Sciences south China is that raw material carries out minimizing and recycling treatment.
Getting above-mentioned Phytolacca acinosa cutting 500kg pushes in the German SITY of the LMT 2000 stoker fired grate incinerators.Controlling this cutting respectively is about 250 ℃ in the temperature of dryer section, and the residence time on dryer section is 120min; Be controlled at about 60min of burning zone residence time; About 650 ℃ of temperature is controlled at about 60min of residence time of after-flame section.Afterwards, take out burning ash content weighing and obtain ash content 11206g, analyze wherein contained main component: Cd 7.2%, and Pb 0.06%, and Ca 11.6%, and Mg 2.365%, and Al 1.4%, and Na 1.51%, and S 0.036%, and P 0.179%.
Adopt NH
4Cl-NH
3-H
2The O system leaches, and joins [NH
4 +]=4mol/L, [NH
3The leaching agent 3L of]=4.0mol/L.Take by weighing this burning ash content 500g, liquid-solid ratio 4:1, extraction time 3 hours, 40 ℃ of extraction temperatures.Leach and finish post analysis leach liquor major metal component content: Cd 16.1g/L, Pb 0.076g/L, wherein the leaching yield of cadmium reaches 91.4%.Should the richness cadmium solution purify and after cooling places 24h, be anode with graphite, stainless steel be that negative electrode carries out electrodeposition in room temperature (about 30 ℃).Bath voltage is 2.8v, current efficiency 93.7%, and pole span 3.8cm, current density is 750A/m
2, after the electrolysis of 80min, obtain cadmium content and be 99.3% cadmium plate.
Embodiment 4
With Herba pteridis vittatae (the Pteris vittata L.) cutting that the Chinese Academy of Sciences was provided is that raw material carries out minimizing and recycling treatment.
Getting above-mentioned Herba pteridis vittatae cutting 200kg pushes in the German SITY of the LMT 2000 stoker fired grate incinerators.Controlling this cutting respectively is about 150 ℃ in the temperature of dryer section, and the residence time on dryer section is 60min; Be controlled at about 60min of burning zone residence time; About 350 ℃ of temperature is controlled at about 60min of residence time of after-flame section.Afterwards, take out burning ash content weighing and obtain ash content 1024g, analyze wherein contained main component: As 4.2%, and Cu 0.21%, and Cd 0.019%, and Fe 2.4%, and Ca 9.6%, and Mg 0.46%, and Al 11.4%, and Na 1.31%, and S 0.163%, and P 0.42%.
Adopt (NH
4)
2CO
3-NH
3-H
2The O system leaches, and joins [NH
4 +]=5mol/L, [NH
3The leaching agent 2L of]=3.0mol/L.Take by weighing this burning ash content 400g, liquid-solid ratio 3:1, extraction time 8 hours, 30 ℃ of extraction temperatures.Leach and finish post analysis leach liquor major metal component content: As13.6g/L, Cu 0.13g/L, Cd 0.132g/L, wherein the leaching yield of arsenic reaches 95.4%.Solid arsenic obtained the Tricalcium arsenate solid after the rich arsenic solution of gained added white lime.
Embodiment 5
The Sedum alfredii Hance (Sedum alfredii Hance) and the Herba pteridis vittatae cutting that provide with south China Environmental Research Institute are that raw material carries out minimizing and recycling treatment.
Getting above-mentioned Sedum alfredii Hance cutting 80kg and Herba pteridis vittatae 20kg pushes in the German SITY2000 of the LMT stoker fired grate incinerator.Controlling this cutting respectively is about 250 ℃ in the temperature of dryer section, and the residence time on dryer section is 30min; Be controlled at about 30min of burning zone residence time; Be controlled at about about 600 ℃ of the temperature of burning zone, be controlled at about 60min of residence time of after-flame section.Afterwards, take out burning ash content weighing and obtain ash content 593g, analyze wherein contained main component: Zn5.7%, Pb 1.01%, and As 1.22%, and Sb 0.78%, and Ca 11.2%, and Mg 1.45%, and Na 1.13%, and S 0.364%, and P 0.9%
Adopt (NH
4)
2SO
4-NH
3-H
2The O system leaches, and leaching agent is formed: [NH
4 +]=5.0mol/L, [NH
3]=2.5mol/L is measured leaching agent 2L, takes by weighing this burning ash content 300g, liquid-solid ratio 6:1, and extraction time 3 hours, 45 ℃ of extraction temperatures leach that to add content behind about 30min be 30% H
2O
215ml forms the colloid co-precipitation with the As/Sb in the solution and comes out, and reaction finishes the main heavy metal component content of post analysis leach liquor: Zn 10.1g/L, and Pb 0.03g/L, As, the concentration of Sb is trace.Extraordinarily go into zinc powder by 10 of plumbous theoretical amount during purification, carry out two sections adverse currents and purify, churning time 30min, temperature is 60 ℃.Scavenging solution graphite is anode electrode, and current density is 350A/m
2, with pole span 8cm, temperature is 30 ℃, bath voltage 3.0v, current efficiency 94.0%.The main component that obtains electric zinc is: Zn〉99.5%, major impurity component content: Ni 0.8ppm, Fe4.5ppm, all the other equal＜0.5ppm of Pb 0.7ppm.Electrolysis waste solution returns leaching after replenishing ammonia.
Claims (8)
1. method of extracting valuable metal from super enriching plant is characterized in that following step:
(1) the super enriching plant cutting is burned, form ash content;
(2) then above-mentioned burning ash content is added the ammonia leaching agent aqueous solution that ammonium salt and ammonia are made, in ammonia gonosome system, leach;
(3) leach liquor is carried out purification and impurity removal, scavenging solution is that anode carries out electrochemical deposition and produces metal target or obtain corresponding compounds by chemical precipitation with the inert material then; Electrolysis waste solution or post precipitation liquid return leaching after replenishing ammonia.
2. according to claim 1 method of from super enriching plant, extracting valuable metal, it is characterized in that described burning process, controlling the super enriching plant cutting respectively is 100～300 ℃ in the temperature of dryer section, and the residence time on dryer section is 10～60min; Being controlled at the burning zone residence time is 10～100min, and the temperature that is controlled at burning zone is 300 ℃～700 ℃; The residence time that is controlled at the after-flame section is 30min～120min.
3. according to claim 1 method of from super enriching plant, extracting valuable metal, it is characterized in that described ammonia gonosome is NH
4Cl-NH
3-H
2O, (NH
4)
2SO
4-NH
3-H
2O, (NH
4)
2CO
3-NH
3-H
2O.
4. according to claim 1 or 3 one kind of method of from super enriching plant, extracting valuable metal, it is characterized in that described ammonia gonosome set member volumetric molar concentration is [NH
4 +]=2～8mol/L, [NH
3]=1～5mol/L, liquid-solid ratio=1～10:1,20～80 ℃ of extraction temperatures, extraction time 30min～540min.
5. according to claim 1 method of from super enriching plant, extracting valuable metal, it is characterized in that the As/Sb that exists in the described leach liquor adopts the colloid coprecipitation method to remove; Other beavy metal impurity except that metal target removes by the metal replacement method.
6. according to claim 1 method of from super enriching plant, extracting valuable metal, it is characterized in that: containing Fe
2+Ash content when leaching, add the oxygenant deironing, oxygenant is H
2O
2, KMnO
4In one or both mixture.
7. according to claim 1 method of from super enriching plant, extracting valuable metal, it is characterized in that described scavenging solution carries out electrochemical deposition when producing metal target, its bath voltage is 1.5～4.5V, is 3～15cm with pole span, cathode current density 100～1000A/m
2, 25～60 ℃ of electrodeposition temperature.
8. according to claim 1 or 7 one kind of method of extracting valuable metal from super enriching plant, the anode material that it is characterized in that described electrochemical deposition is high purity graphite or is coated with ruthenium titanium plate.
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|---|---|---|---|
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| CN106939376A (en) * | 2017-04-01 | 2017-07-11 | 北京神源环保有限公司 | A kind of system and method for recycling super enriching plant cutting |
| CN106987722A (en) * | 2017-04-01 | 2017-07-28 | 北京神源环保有限公司 | A kind of system and method for super enriching plant cutting recycling |
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2008
- 2008-10-15 CN CNA2008101433245A patent/CN101372727A/en active Pending
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| DE102020210948A1 (en) | 2020-08-31 | 2022-03-03 | Volkswagen Aktiengesellschaft | Process for the recovery of substances from used battery cells |
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| CN113186394B (en) * | 2020-12-15 | 2023-03-03 | 云南宇菲工程设计有限责任公司 | Method for producing metal zinc by treating high-lead zinc-containing material by ammonia-ammonium method |
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