CN205252912U - Concentrated membrane group ware of dilute sulfuric acid electrodialysis - Google Patents
Concentrated membrane group ware of dilute sulfuric acid electrodialysis Download PDFInfo
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- CN205252912U CN205252912U CN201521076225.1U CN201521076225U CN205252912U CN 205252912 U CN205252912 U CN 205252912U CN 201521076225 U CN201521076225 U CN 201521076225U CN 205252912 U CN205252912 U CN 205252912U
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Abstract
The utility model belongs to the technical field of the water treatment, the concentrated electrodialysis device of dilute sulfuric acid of concretely relates to, this concentrated membrane group ware of dilute sulfuric acid electrodialysis includes acidproof electrode, acidproof compound baffle, acidproof anode membrane, hinders sour cavity block. Wherein the electrode is that tantalum platinoiridita electrode is scribbled to the titanium, the baffle is compound elasticity baffle, is formed by PP, PTFE preparation, acidproof anode membrane adopts perfluor grafting anode membrane, hinder the cavity block that sour cavity block adopted butyl quaternary amine functional group. Concentration to the homogeneous phase membrane electrodialytic membranes more than 20% group ware can carry out 0.01~10% dilute sulfuric acid.
Description
Technical field
The utility model belongs to water-treatment technology field, is specifically related to an electrodialysis plant that dilute sulfuric acid is concentrated.
Background technology
Sulfuric acid is one of most widely used basic chemical industry product, and sulfuric acid in use can be divided into three kinds substantiallySituation: the one, be fixed in product as the part of product; The 2nd, be transformed into undesirable by-productProduct, as saltcake, gypsum, ferrous sulfate etc.; The 3rd, discharge from product systems with Waste Sulfuric Acid form. Sulfuric acidA large user be organic chemical industry's industry (comprising crude Treatment industry, printing and dyeing industry etc.), wherein nearly 1/3Sulfuric acid be transformed into spent acid; Another sulfuric acid large user is titanium dioxide industry, according to statistics, and every production 1t titanium white,Want the dilute sulfuric acid 7～11t of by-product containing 20% left and right; Be used for the pickle of metallurgical industry too.
Waste Sulfuric Acid is in use diluted and pollutes, and generally should not in original production system, reuse.
How to process and reclaim these Waste Sulfuric Acids, the no matter angle from making full use of the natural resources, or from environmentThe angle of protection is all noticeable problem.
Up to now, the technique that spent acid reclaims is mainly divided into two large classes: a class is acid regeneration; One class is spent acidConcentrated. Because cost and the energy consumption of acid regeneration are all higher, in actual industrial production, seldom adopt.In industrial production, the more method that adopts concentrating waste acid is carried out reclaim sulfuric acid, and these class methods comprise that submerged combustion is denseContracting, drum-type are concentrated, Vacuum Concentration, cooking-pot type are concentrated and spray concentration etc. It is exactly concentrated energy jointly especiallyConsume very high, if adopt electrodialysis concentrate, its concentrated energy consumption will significantly reduce.
Electrodialytic principle is under the effect of DC electric field, and ion sees through selective ion exchange membrane and moves,Thereby make the electrolyte ion process that part is separated in solution.
Electrodialytic technique is to develop early and obtain one of membrane separation technique of great industry achievement. The research at initial stageCan trace back to before twoth century. Most of historical reports are all French scholar A. from 1748Noller finds that water can be diffused into naturally by pericystium that the experiment of ethanolic solution starts first. This realityIssue after examination and approval existing and confirmed that water can see through the phenomenon of osmosis of animal membrane. Within 1854, Graham has found osmotic phenomena.Within 1863, Dubrunfaut has made first film dialyzer, has successfully carried out separating of sugar and salt. 1903Year Morse and Pierce are placed in respectively the inner and outside solution of bag filter two electrodes, find chargedImpurity can more promptly from gel, remove. Nineteen twenty-four Pauli adopts the principle of Chemical Engineering Design, improvesThe experimental rig of Morse, tries hard to alleviate polarization, increases mass transfer rate. Although they are that employing is non-selectiveSee through film, but these ground-breaking work, the effect that has produced inspiration property for practical electrodialytic exploitation later.Meyer in 1940 and Strauss have proposed the concept of many compartments electrodialysis plant with Practical significance. SpecialNot that nineteen fifty Juda and McRae have succeeded in developing the positive and negative amberplex with high selection permeabilityAfter, the practicality basis of just having established electrodialytic technique.
First electrodialysis plant was made up of American I onics company in nineteen fifty-two in the world, light for bitterChange, then just drop into commercialization and produce. American and Britain all manufacture and electrodialysis device desalination bitter subsequently,Potable water and water for industrial use, and be transported to successively other countries. Japan is at just note at the end of the fifties in last centuryThe exploitation of heavy this technology, research direction is mainly that seawater concentrates salt manufacturing. Due to the unit price of function admirable fromThe selective research success of film and the exquisiteness of technology of seeing through of son, makes Japan in the concentrated salt manufacturing of electrodialysis seawaterTechnical elements is held the lead so far, produces at present salt 1,600,000 t per year. After 1970, Japan is also by electricityDialysis is for brackish water desalination. The sea water desalinating unit of day producing drinking water 120t has been built on islands out of office in 1974.Within 1972, American I onics company has released frequently pole-reversing electroosmosis device, and every 10-15min polarity of electrode is adjustedChange once, improved the operation stability of device. American I onpureTechnology company is raw again in recent yearsProduce continuous deionization electrodialysis plant, i.e. filling ion-exchange resin or ion in electrodialysis desalting chamberExchange fiber, directly high purity water continuously, and resin need not be regenerated. Study in the world now electrodialysisCountry have the U.S., Japan, the former Soviet Union, Britain, France, Italy, Germany, Canada, Israel,Holland, the nations of China and India etc. Technically, the U.S. and Japan are leading. It is about that Japan produces amberplex per year3.5×105m2. After the seventies in last century, former Soviet Union's development is also very fast, produces amberplex per year about2.5×105m2, wherein 85% is heterogeneous ion-exchange membrane.
The research of China's electrodialytic technique starts from 1958. At the beginning of the sixties, with domestic polyvinyl alcohol heterogeneous membraneThe small electrical electrodialysis apparatus of assembling just drops into sea trial. Nineteen sixty-five, First is installed on Chengdu-Kunming railwayBrackish water desalination device. Within 1967, polystyrene heterogeneous ion-exchange membrane puts into production, for electrodialytic techniqueApply the condition created. After the seventies in last century, electrodialytic technique development is very fast, in ion-exchangeThe research aspect of the main device parts such as film, dividing plate, electrode and body construction all to some extent innovation, device toRegularization, Standardization Development, aspect the operational management of System Engineering Design and device, also accumulated richerRich experience. Within 1976, built up the electrodialysis waterwheel processed of daily output primary pure water 6600t in Shanghai Jinshan petrochemical industryBetween, within 1980, built up the electrodialytic desalination station of producing fresh water 200t daily in Xisha. China's amberplexAnnual production be stabilized in 4.0 × 105m2, account for 1/3 of world's desalination amberplex.
Simultaneous several adjoint processes in electrodialytic process, describe each with the mass transfer characteristic parameter quantitative of filmThe intensity of individual process. The electric osmose dehydration forming with the migration of hydrated ion form, different films are more or less the same. By denseThe poor electrolyte diffusion coefficient causing and the infiltration coefficient of water differ greatly. These adjoint processes have reduced concentratedMultiple and current efficiency, and aggravate along with the rising of operating current density and film both sides concentration difference. With in, lowThe desalination of concentration feed liquid is compared, concentrated higher to the mass transfer characteristic parameter request of film, and particularly acid is concentrated to filmRequirement than ordinary salt concentrated require tallerly, general heterogeneous ion-exchange membrane is difficult to reach requirement.
But these electrodialytic processes have a common ground, to be exactly that electrodialysis film group device is not acidproof can not be used for acid for thatConcentrated, or acid concentration after concentrated is very low, can not carry out industrial applications.
Utility model content
For above present situation, on the basis of forefathers' research, for the particular/special requirement of the concentrated dilute sulfuric acid of electrodialysis,Carried out series of studies and exploitation, through many-sided experimental study, finally developed there is strong alkali-acid resistance,In anti-, leak with anti-ly leak outside, the concentrated specific complex dividing plate of anti-creeping electrodialysis acid, fully solved many externalThe interference effect of factor, ensures that the accuracy of service data is with repeated; On this basis, according to electrodialysisThe requirement that acid is concentrated, continues hindering sour cavity block, acidproof anode membrane, acidproof positive electrode, clamping device, heat exchangeDevice, runner design, current density, flow velocity are studied and are optimized, and finally developing can be to dilute sulfuric acidBe concentrated into the concentrated electrodialysis film group device of acid of 20% above concentration.
Main purpose of the present utility model is that exploitation a kind ofly can be concentrated into 20% to 0.01～10% dilute sulfuric acidAbove homogeneous membrane electrodialysis film group device; The purpose of this utility model be also to provide one can carry out economy,The concentrated operational factor of dilute sulfuric acid electrodialysis of environmental protection.
The utility model is achieved by following technical proposals:
The concentrated film group device of a kind of dilute sulfuric acid electrodialysis, comprise acidproof electrode, acidproof composite diaphragm, acidproof anode membrane,Hinder sour cavity block; Described acidproof electrode, acidproof anode membrane, acidproof composite diaphragm, resistance acid cavity block are arranged in order;
Acidproof electrode is that titanium is coated with tantalum platinoiridita electrode; Acidproof composite diaphragm is be made by PP, PTFE compoundElastic baffle; Acidproof anode membrane is perfluor grafting anode membrane; Hindering sour cavity block is the cavity block that adopts butyl quaternary amine functional group.
Preferably, the titanium painting tantalum platinoiridita electrode in the concentrated film group device of described dilute sulfuric acid electrodialysis comprises titanium plate, platinumCoating and tantalum oxide, yttrium oxide, ruthenium-oxide mixture coating.
Preferably, the acidproof composite diaphragm in the concentrated film group device of described dilute sulfuric acid electrodialysis is that PP, PTFE are multipleClose layer.
Preferably, the film resistance of the acidproof anode membrane in the concentrated film group device of described dilute sulfuric acid electrodialysis is 2～4 Ω/cm2, the degree of cross linking is 70～90%, film thickness is 0.1～0.16mm.
Preferably, the film resistance of the resistance acid cavity block in the concentrated film group device of described dilute sulfuric acid electrodialysis is 3～6 Ω/cm2, the degree of cross linking is 70～90%, film thickness is 0.1～0.16mm.
Particularly,
The concentrated film group device of a kind of dilute sulfuric acid electrodialysis, comprise acidproof electrode, acidproof composite diaphragm, acidproof anode membrane,Hinder sour cavity block. Wherein electrode is that titanium is coated with tantalum platinoiridita electrode; Dividing plate is composite elastic dividing plate, by PP, PTFE systemForm; Acidproof anode membrane adopts perfluor grafting anode membrane; Hinder the cavity block that sour cavity block adopts butyl quaternary amine functional group.
An acidproof electrode described in the concentrated film group device of dilute sulfuric acid electrodialysis, the titanium plate of employing 0.5-2 millimeters thick,After ultrasonic cleaning, hydrofluoric acid clean, then do after surface treatment with oxalic acid, carry out primary coat, platinum coating with platinumThickness is 0.5～2 micron. After platinum primary coat, carry out coating sintering with tantalum oxide, yttrium oxide, ruthenium-oxide, altogetherCoating and sintering form electrode surface coating, the wherein mass ratio of tantalum oxide, yttrium oxide, ruthenium-oxide ten timesBe 0.01～10:0.01～5:0.01～3. Sintering temperature is 700～1000 DEG C, and each sintering time is 1～5Hour.
Acidproof dividing plate described in the concentrated film group device of dilute sulfuric acid electrodialysis is a composite elastic dividing plate, employing PP,PTFE (PP, PTFE are respectively polypropylene and polytetrafluoroethylene (PTFE)) is in batches in plasma chamber medium and high temperature, lazyProperty environment under spray one-shaping technique make elastic baffle. Be 120～220 DEG C in temperature, first spray with PPPainting the shape of dividing plate, then use PTFE after ion activation, is at 220～280 DEG C, PTFE to be sprayed in temperatureTo the PP dividing plate just now forming, carry out blend. The electrode of gas ions adopts high-frequency capacitive lotus root composite electrode, shakesDynamic frequency 30～50MC, the ratio that plasma oxygen purity used is 99.1～99.8%, PTFE is10％～40％；
At electrodialysis concentration process processed, electrodialytic membranes used and most important. Heterogeneous membrane electrodialysis is expanded because of concentration difference1～2 order of magnitude that the loose electrolyte diffusion coefficient causing is homogeneous membrane, the infiltration coefficient of water are 1 quantityLevel, transference number of ions is also low, has formed one of principal element of the concentrated concentration of impact. Homogeneous membrane equally,Because the acidproof concentration of common anode membrane is limited, when general acid concentration exceedes 10%, be easy to damage. And due to hydrogen fromSub-volume is especially little, and common cavity block cannot stop, therefore while concentrating by common homogeneous membrane, surpass when acid is concentratedAfter 10% time, cavity block selectively declines to a great extent to hydrionic, so that current efficiency declines to a great extent. In this realityIn novel, we have developed the homogeneous membrane of low concentration difference diffusion system, low water permeability coefficient, resisting high-concentration acid.
Film group device described in the concentrated film group device of a kind of dilute sulfuric acid electrodialysis comprises acidproof anode membrane, resistance acid cavity block, whereinAnode membrane is taking thickness as the pure tetrafluoroethylene of 0.1～0.15 millimeter is as counterdie, with after irradiation grafting, then with containingThe anode membrane that the method for soaking is prepared, controlling diaphragm resistance is 2～4 Ω/cm2, the degree of cross linking is 70～90%, film thickness is0.1～0.16mm. Hinder sour cavity block and be also with the pure tetrafluoroethylene that thickness is 0.1～0.15 millimeter be counterdie, useAfter irradiation grafting, then the cavity block being prepared by impregnation method, but replace the chloromethane of common cavity block with chlorobutyl etherEther is prepared the sour cavity block of resistance, and controlling diaphragm resistance is 3～6 Ω/cm2, the degree of cross linking is 70～90%, film thickness is0.1～0.16mm. Use these high performance homogeneous ion-exchange membranes, the concentration of concentrated vitriol significantly improved,And little power consumption, speed are fast.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will be to realityThe accompanying drawing of executing required use in example or description of the Prior Art is briefly described, and apparently, retouches belowAccompanying drawing in stating is only embodiment more of the present utility model, for those of ordinary skill in the art,Do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the concentrated electrodialysis film group device structure front schematic view of dilute sulfuric acid of the present utility model.
Fig. 2 is the concentrated electrodialysis film group device texture edge schematic diagram of dilute sulfuric acid of the present utility model.
Label declaration: 1, anolyte import; 2, the acidproof anode membrane of homogeneous phase; 3, the acidproof dividing plate of elasticity; 4, homogeneous phaseHinder sour cavity block; 5, catholyte import; 6, fastening bolt; 7, diluted acid import; 8, utmost point liquid runner plate; 9,Anode terminal; 10, clamp steel plate; 11, light liquid outlet; 12, concentrated acid outlet; 13, cathode terminal;14, concentrated acid import; 15, platinum tantalum iridium electrode; 16, anolyte outlet; 17, catholyte outlet.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, following examples are to this practicalityNovel explanation and the utility model is not limited to following examples.
Embodiment 1
According to theory structure shown in Fig. 1, Fig. 2, an electrodialysis thin sulfuric acid thickener is installed, this dilute sulfuric acidConcentrated electrodialysis film group device structure comprises anolyte import 1; The acidproof anode membrane 2 of homogeneous phase; The acidproof dividing plate 3 of elasticity;All phase resistance acid cavity blocks 4; Catholyte import 5; Fastening bolt 6; Diluted acid import 7; Utmost point liquid runner plate 8; AnodeBinding post 9; Clamp steel plate 10; Light liquid outlet 11; Concentrated acid outlet 12; Cathode terminal 13; Concentrated acid import14; Platinum tantalum iridium electrode 15; Anolyte outlet 16; Catholyte outlet 17; Film group device size adopts 400*800mm,Film group device comprises acidproof electrode, acidproof composite diaphragm, acidproof anode membrane, resistance acid cavity block. Wherein acidproof electrode platinumPrimary coat thickness is 1 micron, and the mass ratio of tantalum oxide, yttrium oxide, ruthenium-oxide is 2:3:5; Sintering temperatureBe 800 DEG C, each sintering time is 4 hours. The PP spraying temperature of making dividing plate is 160 DEG C, PTFE'sSpraying temperature is 230 DEG C, gas ions electrode vibration frequency 40MC, and plasma oxygen purity used isThe ratio of 99.5%, PTFE is 20%; The film resistance of acidproof anode membrane is 3 Ω/cm2, the degree of cross linking is 80%, thicknessDegree is 0.12mm. The film resistance that hinders sour cavity block is 4 Ω/cm2, the degree of cross linking is 85%, film thickness is 0.13mm.
Taking the dilute sulfuric acid containing 2% sulfuric acid as entering the light chamber of electrodialysis. Electrodialysis current density is 600A/m2，Crossflow velocity is 8m/s, and electrodialysis operation water temperature is 36 DEG C. After the concentrated operation of electrodialysis, the fresh water of light chamberConcentration is that 0.05% sulfuric acid fresh water can neutralize discharge, and the sulfuric acid concentration of dense chamber is 20%. Whole dilute sulfuric acid placeReason current efficiency is up to 85%, and total energy consumption is 3 degree electricity/ton dilute sulfuric acids, significantly lower than multiple-effect evaporation.
Embodiment 2
According to theory structure shown in Fig. 1, Fig. 2, an electrodialysis thin sulfuric acid thickener is installed, same to embodiment1; Film group device size adopts 400*800mm, and film group device comprises acidproof electrode, acidproof composite diaphragm, acidproof sunFilm, hinder sour cavity block. Wherein acidproof electrode platinum primary coat thickness is 1.5 microns, tantalum oxide, yttrium oxide, oxidationThe mass ratio of ruthenium is 3:2:4; Sintering temperature is 850 DEG C, and each sintering time is 4.5 hours. MakeThe PP spraying temperature of dividing plate is 140 DEG C, and the spraying temperature of PTFE is 220 DEG C, gas ions electrode vibration frequency30MC, the ratio that plasma oxygen purity used is 99.5%, PTFE is 30%; The film electricity of acidproof anode membraneResistance is 3.5 Ω/cm2, the degree of cross linking is 85%, film thickness is 0.12mm. The film resistance that hinders sour cavity block is 4 Ω/cm2，The degree of cross linking is 80%, and film thickness is 0.12mm.
Taking the dilute sulfuric acid containing 1.5% sulfuric acid as entering the light chamber of electrodialysis. Electrodialysis current density is 500A/m2, crossflow velocity is 6m/s, electrodialysis operation water temperature is 32 DEG C. After the concentrated operation of electrodialysis, light chamberFresh water concentration be 0.02% sulfuric acid fresh water can neutralize discharge, the sulfuric acid concentration of dense chamber is 20%. Whole rareSulfuric acid treatment current efficiency is up to 85%, and total energy consumption is 2.5 degree electricity/ton dilute sulfuric acids, significantly lower than multiple-effect evaporation.
Embodiment 3
According to theory structure shown in Fig. 1, Fig. 2, an electrodialysis thin sulfuric acid thickener is installed, same to embodiment1; Film group device size adopts 600*1200mm, and film group device comprises acidproof electrode, acidproof composite diaphragm, acidproof sunFilm, hinder sour cavity block. Wherein acidproof electrode platinum primary coat thickness is 1.5 microns, tantalum oxide, yttrium oxide, oxidationThe mass ratio of ruthenium is 3:5:3; Sintering temperature is 850 DEG C, and each sintering time is 3.5 hours. MakeThe PP spraying temperature of dividing plate is 120 DEG C, and the spraying temperature of PTFE is 240 DEG C, gas ions electrode vibration frequency50MC, the ratio that plasma oxygen purity used is 99.5%, PTFE is 30%; The film electricity of acidproof anode membraneResistance is 3.5 Ω/cm2, the degree of cross linking is 85%, film thickness is 0.12mm. The film resistance that hinders sour cavity block is 4.5 Ω/cm2, the degree of cross linking is 86%, film thickness is 0.11mm.
Taking the dilute sulfuric acid containing 2.5% sulfuric acid as entering the light chamber of electrodialysis. Electrodialysis current density is 1000A/m2, crossflow velocity is 6m/s, electrodialysis operation water temperature is 30 DEG C. After the concentrated operation of electrodialysis, light chamberFresh water concentration be 0.05% sulfuric acid fresh water can neutralize discharge, the sulfuric acid concentration of dense chamber is 25%. Whole rareSulfuric acid treatment current efficiency is up to 82%, and total energy consumption is 3.8 degree electricity/ton dilute sulfuric acids, significantly lower than multiple-effect evaporation.
Embodiment 4
According to theory structure shown in Fig. 1, Fig. 2, an electrodialysis thin sulfuric acid thickener is installed, same to embodiment1; Film group device size adopts 600*1200mm, and film group device comprises acidproof electrode, acidproof composite diaphragm, acidproof sunFilm, hinder sour cavity block. Wherein acidproof electrode platinum primary coat thickness is 2 microns, tantalum oxide, yttrium oxide, ruthenium-oxideMass ratio be 3:1:4; Sintering temperature is 900 DEG C, and each sintering time is 3 hours. Make dividing platePP spraying temperature be 150 DEG C, the spraying temperature of PTFE is 250 DEG C, gas ions electrode vibration frequency 50MC,The ratio that plasma oxygen purity used is 99.5%, PTFE is 25%; The film resistance of acidproof anode membrane is 4 Ω/cm2, the degree of cross linking is 85%, film thickness is 0.13mm. The film resistance that hinders sour cavity block is 5 Ω/cm2, crosslinkedDegree is 85%, and film thickness is 0.12mm.
Taking the dilute sulfuric acid containing 3% sulfuric acid as entering the light chamber of electrodialysis. Electrodialysis current density is 900A/m2，Crossflow velocity is 6m/s, and electrodialysis operation water temperature is 35 DEG C. After the concentrated operation of electrodialysis, the fresh water of light chamberConcentration is that 0.05% sulfuric acid fresh water can neutralize discharge, and the sulfuric acid concentration of dense chamber is 25%. Whole dilute sulfuric acid placeReason current efficiency is up to 85%, and total energy consumption is 4 degree electricity/ton dilute sulfuric acids, significantly lower than multiple-effect evaporation.
In addition, it should be noted that, the specific embodiment described in this description, the shape of its parts and components,Institute's title of being named etc. can be different. Allly do according to structure, feature and principle the utility model patent design describedEquivalence or simple change, be included in the protection domain of the utility model patent. Under the utility modelThose skilled in the art can make various amendments or supplement or adopt described specific embodimentSubstitute by similar mode, only otherwise depart from structure of the present utility model or surmount these claims and determineThe scope of justice, all should belong to protection domain of the present utility model.
Claims (5)
1. the concentrated film group device of dilute sulfuric acid electrodialysis, is characterized in that: described dilute sulfuric acid electrodialysis is concentratedFilm group device comprises acidproof electrode, acidproof composite diaphragm, acidproof anode membrane, resistance acid cavity block;
Described acidproof electrode, acidproof anode membrane, acidproof composite diaphragm, resistance acid cavity block are arranged in order;
Described acidproof electrode is that titanium is coated with tantalum platinoiridita electrode;
Described acidproof composite diaphragm is the composite elastic dividing plate being made by PP, PTFE;
Described acidproof anode membrane is perfluor grafting anode membrane;
Described resistance acid cavity block is the cavity block that adopts butyl quaternary amine functional group.
2. the concentrated film group device of dilute sulfuric acid electrodialysis according to claim 1, is characterized in that: described
Titanium is coated with tantalum platinoiridita electrode and comprises titanium plate, platinum coating and tantalum oxide, yttrium oxide, ruthenium-oxide mixture coating.
3. the concentrated film group device of dilute sulfuric acid electrodialysis according to claim 1, is characterized in that: describedAcidproof composite diaphragm is PP, PTFE composite bed.
4. the concentrated film group device of dilute sulfuric acid electrodialysis according to claim 1, is characterized in that: describedThe film resistance of acidproof anode membrane is 2～4 Ω/cm2, the degree of cross linking is 70～90%, film thickness is 0.1～0.16mm.
5. the concentrated film group device of dilute sulfuric acid electrodialysis according to claim 1, is characterized in that: describedThe film resistance that hinders sour cavity block is 3～6 Ω/cm2, the degree of cross linking is 70～90%, film thickness is 0.1～0.16mm.
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| CN106890572A (en) * | 2015-12-21 | 2017-06-27 | 杭州水处理技术研究开发中心有限公司 | Dilute sulfuric acid electrodialysis concentrates film group device |
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| CN106890572A (en) * | 2015-12-21 | 2017-06-27 | 杭州水处理技术研究开发中心有限公司 | Dilute sulfuric acid electrodialysis concentrates film group device |
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