101 results about "Zinc compounds" patented technology

The invention relates to the technical field of domestic ceramics, in particular to a high-strength and high-gloss domestic ceramic and a preparation method thereof, and the high-strength and high-gloss domestic ceramic comprises the following raw materials in parts by weight: 35-45 parts of mullite, 15-20 parts of spodumene, 10-15 parts of quartz, 8-12 parts of a modifier doped with barium carbonate, 5-8 parts of a boric oxide additive and 7-11 parts of a yttrium-zinc reconditioning agent. According to the domestic ceramic, mullite, spodumene and quartz are used as matrixes, an added yttrium-zinc compound regulator is used as an antibacterial functional agent, nano-zinc oxide is blended into cobalt nitrate and yttrium nitrate solutions, sintering improvement is performed, and the antibacterial stability of the product is enhanced and optimized through compounding of yttrium, zinc and cobalt; meanwhile, the added modifier doped with barium carbonate and the boron oxide additive are mutually blended and coordinated, so that the antibacterial property, the glossiness and the strength of the obtained domestic ceramic are improved in a balanced and coordinated manner, and the product is remarkable in cold and heat resistance and temperature-resistant stability effect.

The invention provides a phosphogypsum-based composite low-temperature heat storage material based on lattice defects and a preparation method of the phosphogypsum-based composite low-temperature heat storage material. The phosphogypsum-based composite low-temperature heat storage material comprises a hydratable calcium sulfate material, a zinc-containing compound and a heat-conducting framework material, wherein the hydratable calcium sulfate material comprises one or more of anhydrous phosphogypsum and semi-hydrated phosphogypsum; the heat-conducting framework material comprises any one of expanded graphite, graphene, carbon nanotubes, boron nitride or silicon carbide. The material prepared by the invention has low phase change temperature, high heat storage density, high heat conductivity and excellent cycle stability, and overcomes the key technical bottleneck of the traditional hydrated salt and ardealite-based heat storage material at one stroke.

The invention discloses a surface protective film and a preparation method thereof, and belongs to the technical field of protective films. The surface protection film comprises a surface layer, a core layer and a bonding layer which are arranged in sequence, the surface layer comprises first polypropylene matrix resin, an organic ultraviolet absorbent and an inorganic ultraviolet screening agent; the core layer comprises second polypropylene matrix resin, polyaryletherketone nanofibers and flaky mica powder of which the surface is coated with cerium oxide; the bonding layer comprises a thermoplastic SEBS elastomer, hydrogenated bonding resin, an organic zinc compound, an ultraviolet light stabilizer and a plasticizer containing an epoxy group. The surface protection film has excellent ultraviolet aging resistance and high temperature resistance, the adhesive force can still be kept within a certain range under the conditions of ultraviolet radiation and high temperature, the surface protection film can be easily unwound under the condition of high temperature, and no residual adhesive is separated out.

The utility model provides a positive pressure ejector for compounding calcium zinc compound stabilizer, which comprises a conduction pipe, a first flange plate, a second flange plate, a feed pipe, a horn mouth and a scattering mechanism, the first flange plate is fixed at one end of the conduction pipe, and the first flange plate is fixed with the output end of an external fan; a second flange plate is fixed at the other end of the conduction pipe; the second flange plate is fixed with a feeding hole of calcium-zinc composite stabilizer processing equipment; a feeding pipe is fixed to the upper side face of the middle of the conduction pipe, a horn mouth is fixed to the other end of the feeding pipe, and a scattering mechanism is fixed to the interior of the feeding pipe. Due to the arrangement of the conduction pipe and the scattering mechanism, calcium-zinc composite stabilizer ingredients can be cut and scattered under the flowing action of gas output by an external fan during use, so that the calcium-zinc composite stabilizer ingredients meet the processing requirements, the quality of produced calcium-zinc composite stabilizers is improved, and in addition, the production efficiency of the calcium-zinc composite stabilizers is improved. Ingredients of the calcium-zinc composite stabilizer can be prevented from flowing back into an external fan.

The invention relates to a method for producing polyesters in polycondensation reactions catalyzed by aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds or mixtures of these titanate compounds. The invention also relates to a composition comprising an aluminum titanate compound, a barium titanate compound, a calcium titanate compound, a zinc titanate compound or a mixture of these titanate compounds as a catalyst for the production of polyesters in polycondensation reactions. Furthermore, the invention relates to the use of an aluminum titanate compound, a barium titanate compound, a calcium titanate compound, a zinc titanate compound or a mixture of these titanate compounds as a heterogeneous polycondensation catalyst. The aluminum titanate compound, the barium titanate compound, the calcium titanate compound, the zinc titanate compound or a mixture of these titanate compounds is a non-amorphous mixed oxide of aluminum oxide (and / or barium oxide, and / or calcium oxide, and / or zinc oxide) and titanium oxide. These titanate compounds have been found to be excellent heterogeneous catalysts in polycondensation reactions for the production of polyesters, such as polyethylene terephthalate.

The application relates to a preparation process of synthesizing hybrid zinc aluminate by using solid waste sodium tetrachloroaluminate, and belongs to the technical field of chemical dangerous waste treatment, and comprises the following synthesis steps: S1, zinc compounds are added in water, and the zinc compounds are completely dissolved or uniformly dispersed; S2, solid waste sodium tetrachloroaluminate is added, and the solid waste sodium tetrachloroaluminate is completely dissolved and reacted by continuing to stir; S3, an oxidizing agent is added, and the reaction is continued by keeping warm and stirring, then filtration is carried out, and the phosphorus content in the filtrate is detected; S4, after the phosphorus content is qualified, sodium hydroxide solution is added into the filtrate, the pH value is controlled, and white zinc aluminate precursor precipitate is generated; S5, the white zinc aluminate precursor precipitate is transferred into a high-pressure reaction kettle to carry out hydrothermal reaction, and hybrid zinc aluminate liquid is generated; S6, negative pressure suction filtration is carried out, the obtained filter solid is washed by using deionized water, the filter solid is subjected to spray drying, and solid hybrid zinc aluminate is obtained. The application fully utilizes aluminum resources in the solid waste sodium tetrachloroaluminate, and total phosphorus impurities in the solid waste sodium tetrachloroaluminate are also utilized to generate effective components, so that waste is turned into treasure.

The invention provides a zinc tannate coated feed additive as well as a preparation method and application thereof, and belongs to the technical field of livestock feed breeding. The preparation method comprises the following steps: crushing a tannic acid-containing plant raw material, uniformly mixing the crushed tannic acid-containing plant raw material with a zinc-containing compound to obtain a plant-zinc-containing compound mixture, adding the plant-zinc-containing compound mixture into a double-screw extruder, mixing, shearing and compressing to obtain puffed plant zinc tannate, crushing the puffed plant zinc tannate, and performing extrusion molding to obtain the plant zinc tannate. Fluidizing and granulating, spraying lac coating liquid, and drying to obtain the zinc tannate coated feed additive. The plant containing tannic acid is used as a raw material, the tedious process of extracting tannic acid is omitted, the coordination reaction of tannic acid and zinc oxide in the plant is accelerated by utilizing a twin-screw extrusion process, targeted release of zinc tannate is realized by adding the shellac coating liquid, the bioavailability is improved, the whole preparation process is environment-friendly, and the preparation method is suitable for industrial production. The method is suitable for large-scale production and commercial utilization.

The present invention provides a catalyst for alcohol transesterification reaction and its application, as well as a method for synthesizing asymmetric dialkyl carbonate, and relates to the technical field of dialkyl carbonate synthesis. The catalyst for alcohol transesterification reaction of the present invention comprises a metal zinc compound and an auxiliary agent; the auxiliary agent is an organic amine strong base. The catalyst provided by the present invention can not only activate the ester carbonyl group, but also activate the alcohol hydroxyl group, thereby enhancing the nucleophilic attack ability of the alcohol raw material and making the ester carbonyl group more efficient in receiving electrophiles. The use of the catalyst of the present invention in alcohol transesterification reaction improves the reaction efficiency and solves the problem that the technical route for directly preparing asymmetric dialkyl carbonate by reacting two different monohydric alcohols with carbon dioxide is subject to thermodynamic limitations and extremely low efficiency.

The present invention provides a negative electrode active material, a zinc ion battery and an electronic device. The chemical formula of the negative electrode active material of the present invention is A x B y The negative electrode active material is a layered compound. Compared with the existing zinc metal negative electrode, the negative electrode active material of the present application is used as the negative electrode. It has better cycle stability and will not cause zinc dendrites, corrosion, passivation and other problems, thereby improving the cycle performance of the battery. The zinc ion battery of the present invention uses the zinc-containing compound as the positive electrode and the layered compound as the negative electrode, and is used for aqueous zinc ion batteries that do not contain zinc metal, thereby broadening the application field of the material. The zinc ion battery of the present invention has the characteristics of safety, low cost, simple synthesis, long cycle life, no zinc dendrites, etc., and has good commercial prospects.

The application discloses a method for recovering zinc and lead metals from lead-rich slag generated in a zinc smelting process, which comprises low-temperature acid leaching, magnetic separation, oxidation heap leaching, stirring leaching and the like processes, so that the lead-rich slag is subjected to low-temperature acid leaching and magnetic separation first, zinc compounds which are easily soluble are leached out sufficiently, and the content of iron ions entering the liquid phase is effectively reduced, thereby reducing the interference of iron ions in the zinc liquid, then the processes of oxidation heap leaching and stirring leaching are combined, and zinc ferrite and zinc sulfide minerals which are difficult to be acid-dissolved can be further dissolved, the zinc-containing substances basically enter the liquid phase, the target of separating lead and zinc is achieved, and finally, combined with dilute hydrochloric acid washing, part of calcium and silicon compounds can be dissolved, so that the lead grade in the final slag is improved, and comprehensive utilization is realized.

This negative electrode for a zinc battery comprises a nonporous current collector and a negative electrode mixture layer which is held by the current collector and contains at least one of zinc, a zinc alloy, and a zinc-containing compound. The negative electrode has a current collector-exposed section in which the negative electrode mixture layer is not disposed, in a portion located at the outermost circumferential surface when wound.

The invention discloses electroplating liquid containing a PEGDA additive, a copper-zinc compound zinc negative electrode material and a preparation method and application of the copper-zinc compound zinc negative electrode material. According to the electroplating solution, a solvent is water, and the electroplating solution comprises ZnSO4, Na2SO4 and PEGDA. According to the preparation method of the copper-zinc compound zinc negative electrode material, a copper foil serving as a working electrode and a zinc plate serving as a counter electrode are placed in the electroplating solution for electroplating treatment, and the copper-zinc compound zinc negative electrode material is obtained. According to the invention, a copper foil is used as a substrate, and a PEGDA additive is added by optimizing an electrochemical galvanizing process to prepare the copper-zinc compound. The additive PEGDA (polyethylene glycol diacrylate) is introduced into the electroplating solution, so that uniform deposition of zinc ions is realized, a zinc deposition substrate can be effectively improved, dendritic crystals are inhibited, side reactions are reduced, a more compact coating with better binding force is obtained, the mechanical strength and interface stability of a negative electrode are remarkably improved, and the performance of the aqueous zinc ion battery is improved.

The present invention belongs to the technical field of water treatment, and specifically relates to a preparation method and application of an iron-zinc nano-microsphere micro-electrolysis composite material. The preparation method first prepares iron-zinc compound nano-microspheres by a solvothermal method, then obtains relatively pure nano-metal oxides after high-temperature calcination, and then mixes it with appropriate proportions of iron powder, modified activated carbon, borax, sodium-based bentonite and pore-forming agent with water, compresses and forms, and after drying, high-temperature sintering is carried out under an oxygen-free negative pressure condition to obtain the iron-zinc nano-microsphere micro-electrolysis composite material. Trace amounts of zinc oxide in the material are reduced to elemental zinc protective layers, which can effectively reduce the oxidation of iron and improve the chemical corrosion resistance of the material surface. This micro-electrolysis material has high catalytic performance and is suitable for the treatment of various industrial wastewaters such as electroplating, chemical industry, printing and dyeing, leather, and pharmaceuticals, and can significantly improve the biodegradability of the wastewater.

In one embodiment, a granule can comprise a mixture, the mixture comprising an amorphous phase material and a biocidal agent including calcium oxide, wherein a 24-hour Ca2+ leaching factor change of the granule (24-LF Change) is at least 10%, the 24-LF Change=(24-LFG710 / 24-LFG)×100%, with 24-LFG being a 24 hour Ca2+ leaching factor of the granule and 24-LFG710 being a 24 hour leaching factor of the granule after subjecting the granule to sintering for 3 hours at a temperature of 710° C. In another embodiment, the granule can comprise a 24-hour Ca2+ Leaching Factor (LFG) of not greater than 1700 ppm. The granule can be essentially free of a copper compound, a silver compound, and a zinc compound, and can be implemented in a building component with long time biocidal activity.

A film capacitor comprising a capacitor element that includes first metallized films electrically connected to a first termination and second metallized films electrically connected to a second termination, and a case within which the capacitor element is disposed, is provided. The case contains a polymer composition that includes 100 parts by weight of a polymer matrix that contains a polyarylene sulfide, from about 30 to about 90 parts by weight of inorganic fibers, and a zinc (II) compound.

To provide a zinc compound or zinc-manganese oxide secondary battery using an aqueous electrolyte.SOLUTION: In order to realize a zinc compound or zinc-manganese oxide secondary battery, a mixed aqueous solution containing zinc chloride as the main component of the electrolyte and manganese chloride as the secondary component of the electrolyte is used.SELECTED DRAWING: None

The invention relates to the technical field of granulation, in particular to granulation equipment for producing a calcium-zinc composite stabilizer, which comprises an electric roller I, the shell is rotationally connected with an electric roller I; the shell is rotationally connected with an electric roller II; a crusher is installed on the shell and located below the first electric roller and the second electric roller. A movable plate is connected to each flow guide plate in a sliding mode, and the movable plates are connected with the shell in a sliding mode; a plurality of electric push rods are fixedly connected to each movable plate, and the telescopic ends of the electric push rods are fixedly connected with the corresponding movable plates; the movable plate is used for stirring powder to flow and also used for driving the first round rod to do up-down reciprocating motion, so that the first round rod pokes and removes small protruding blocks remaining in the groove, the problem that granulation fails due to the fact that the small protruding blocks are left in the groove is solved, and after the poked small blocks move to the gap between the first electric roller and the second electric roller, the small protruding blocks are separated from the first electric roller and the second electric roller. And extrusion granulation operation can be carried out again, waste is avoided, and economic benefits can be improved.

A film capacitor comprising a capacitor element that includes first metallized films electrically connected to a first termination and second metallized films electrically connected to a second termination, and a case within which the capacitor element is disposed, is provided. The case contains a polymer composition that includes 100 parts by weight of a polymer matrix that contains a polyarylene sulfide, from about 30 to about 90 parts by weight of inorganic fibers, and a zinc (II) compound.

The present invention relates to a method for producing polyester in a polycondensation reaction catalyzed by aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof. The present invention also relates to a composition containing aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof as a catalyst for polyester production in a polycondensation reaction. Furthermore, the present invention relates to the use of aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof as heterogeneous polycondensation catalysts. Aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof are amorphous mixed oxides of aluminum oxide (and / or barium oxide, and / or calcium oxide, and / or zinc oxide) with titanium oxide. These titanate compounds have been found to be excellent heterogeneous catalysts in polycondensation reactions for producing polyesters such as polyethylene terephthalate.

The present invention discloses a coated steel sheet for hot stamping and an aqueous surface treatment liquid used therein. The coated steel sheet for hot stamping comprises a coated steel sheet and a composite film layer formed by applying the aqueous surface treatment liquid to the coated steel sheet. The coated steel sheet comprises a substrate and an Al or AlSi coating layer disposed on one or both sides of the substrate. The composite film layer contains an aqueous anionic polymer resin A, a tungsten-containing compound B, a zinc-containing compound C, a boron-containing compound D, a water-soluble thickener E, and an aqueous surface improvement additive F. By designing the composition of the aqueous surface treatment liquid and applying it to the surface of the coated steel sheet, the present invention ensures that the coated steel sheet for hot stamping has good high-temperature lubricity during hot stamping processing, improves the processing performance of the coated steel sheet for hot stamping, reduces wear on the die surface of hot stamping dies, reduces the frequency of die repairs, and improves production efficiency.

Described herein is a building panel comprising a fibrous substrate; and a coating applied to the substrate, the coating comprising a blend of: an antimicrobial composition, a binder, and a pigment, wherein the antimicrobial composition comprises a boro-phosphate ester zinc compound.

The present application relates to the technical field of battery shell production, and particularly relates to a production method of a battery aluminum shell.The present application discloses a production method of a battery aluminum shell, which comprises the following steps: after 6-series aluminum alloy is subjected to melting, degassing, continuous casting and rolling forming, the aluminum alloy is subjected to two-stage ball milling together with zirconium diboride and modified lignin to prepare a composite plate; after pretreatment through alkali washing and acid etching, the plate is coated with a lignin-zinc compound coating and solidified; after preheating, the plate is pulled through a gradient temperature mold to perform hot draw forming, and an interface reaction occurs simultaneously; after laser repair welding of defects, the plate is subjected to preheating, cooling and stabilization heat treatment; finally, the plate is subjected to precise machining such as milling and polishing to obtain a finished product.The present application can make the aluminum shell have stable microstructure and optimized interface bonding, excellent mechanical properties and corrosion resistance by means of phase composite, gradient coating and heat treatment regulation, and the process is controllable, so the present application is suitable for large-scale production of battery aluminum shells.

[Solution] A gas barrier composition containing (A) a polyester polyol resin or polyurethane polyol resin having an acid value, (B) a divalent metal compound, and an organic solvent, the acid value of the polyester polyol resin or polyurethane polyol resin (A) in the composition is 150 mgKOH / g or less, the gas barrier coating agent contains the composition, and the laminate has a coating layer obtained by applying the coating agent. The divalent metal compound (B) is preferably at least one compound selected from the group consisting of zinc compounds, magnesium compounds, and calcium compounds.

The present application belongs to the technical field of compound fertilizer production control, and relates to a production process control method of humic acid chelated zinc compound fertilizer particles. The present application allocates the total amount of zinc source to each monitoring period according to a non-linear decreasing strategy, establishes the addition rate, and reversely corrects the subsequent addition rate in combination with the chelation rate change rate. The chelation rate change rate and the coupling coefficient of temperature-chelation rate are calculated in real time, and the criterion is used to dynamically execute the temperature and speed reduction, speed increase, pulse stirring and stepwise temperature increase cooperative activation mode. When the chelation rate change rate continuously converges, the coupling coefficient maintains positive correlation, and the zinc source addition is completed, the reaction termination condition is determined by multi-index joint determination. The present application solves the problems of mismatching between zinc source addition and reaction progress, difficulty in restoring reaction efficiency by single parameter adjustment, and lag in reaction endpoint judgment in the existing process, realizes the dynamic balance between zinc source supply and chelation capacity, and ensures the stability of the product chelation rate.

The present invention relates to the technical field of cadmium-zinc composite contaminated soil remediation, and discloses a method for remediating cadmium-zinc composite contaminated soil by using an improver in collaboration with woody plants, comprising: preparing and using rice straw biochar functionalized with polyaspartic acid or / and attapulgite functionalized with branched carboxyl functional monomer M-Carboxylation as a soil improver for cadmium-zinc composite contaminated soil; and 2 The soil conditioner is fully mixed into the top 20-40 cm of weakly alkaline soil heavily contaminated with cadmium and zinc compounds at a ratio of 0.05; woody oak seedlings are planted, and weeding and pest control is performed regularly. The present invention uses the conditioner to chelate cadmium and zinc ions in the soil, promoting the transport of cadmium and zinc from the roots to the aboveground parts of the oak tree, increasing the accumulation of cadmium and zinc in the woody oak tree, and significantly improving the oak tree's efficiency in remediating cadmium and zinc compound-contaminated soil.

The invention discloses an application of a composite catalyst in catalytic synthesis of carbon dioxide-based polycarbonate. Wherein the molar ratio of the zinc compound to the alkoxy aluminum compound is (1: 0.1)-(1: 15). The zinc compound is a compound with a general formula of Zn-R (COO) 2, wherein R is C2-C6 alkyl. The general formula of the alkoxy aluminum compound is Al (OR) 3, wherein R is C1-C8 alkyl. The composite catalyst prepared by the invention is simple in preparation method, and has the characteristics of high catalytic activity, low polyether content and high molecular weight of the obtained copolymer.

The present invention discloses a method for preparing zinc-doped metatitanic acid and a method for producing titanium dioxide using a sulfuric acid process. The method comprises the following steps: S1, mixing or dissolving a zinc-containing compound with a sodium hydroxide solution having a concentration of not less than 1 mol / L, removing impurities and diluting the solution to obtain a diluted zinc-containing alkali solution having a sodium hydroxide concentration of 0.1 to 0.5 mol / L; S2, adding industrial titanium solution to the diluted zinc-containing alkali solution so that the pH value of the system is 4.7 to 5.3 and the system temperature is 30 to 40°C after the addition is completed, thereby obtaining a zinc hydroxide suspension; S3, heating the zinc hydroxide suspension to 70 to 90°C, then transferring the solution to preheated industrial titanium solution and stirring and mixing the solution to obtain a mixed solution; S4, heating the mixed solution to boiling and hydrolyzing the solution to obtain zinc-doped metatitanic acid. The present invention is advantageous for effectively regulating the calcination temperature and rutile grains, and does not require salt treatment of the zinc-doped metatitanic acid. The conversion to rutile titanium dioxide can be completed by direct calcination at a relatively low temperature.

The application relates to the technical field of galvanizing steel pipes, and discloses a high-zinc-content control method and system for hot-dip galvanizing steel pipes. The method comprises the following steps: completely removing impurities and acid residues on the surface of the steel pipe by adopting a secondary pickling and secondary water washing pretreatment process, forming a uniform salt film to improve the wettability of the base body by means of solvent online treatment and a composite plating aid system, monitoring and regulating the content of alloy elements such as aluminum, nickel and magnesium in the zinc liquid in real time by means of a spectrometer, accurately controlling the zinc liquid temperature and zinc immersion time according to the pipe diameter and steel grade by querying a four-dimensional parameter database, dynamically adjusting the cooling time according to the pipe diameter in the post-processing stage, and controlling the distribution of iron-zinc compounds and iron-aluminum inhibition layers by means of metallographic structure detection, so that the high-zinc-content target is stably achieved. The application cooperatively controls the uniformity of the zinc liquid temperature by means of multi-point temperature measurement, dynamically adjusts the cooling time according to the pipe diameter, and adopts quantitative metallographic structure detection, so that the stable output capacity of the high-zinc-content and the consistency of the coating quality are improved.

The application relates to a slow-release metal ion phosphate antibacterial glass and a preparation method thereof. The antibacterial glass is prepared from the following powders according to percentage by weight: 1-10% of a copper compound, 0.2-2% of an iron compound, 0-5% of an aluminum compound, 1-10% of a zinc compound, 0.5-5% of a boron compound, 2-4% of a silver compound, 10-30% of a sodium compound, 35-70% of a calcium compound, and at least one compound in the powders is a phosphate or an oxide of phosphorus; the preparation method comprises the following steps: mixing the powders, stirring the mixed powders at a speed of 500-1000 revolutions per minute for 10-20 minutes, heating the stirred powders, keeping the temperature at 900-1150 DEG C for 0.5-2 hours to obtain a melt, pouring the melt into a mold, and cooling and shaping to obtain the antibacterial glass. The antibacterial glass can exert excellent bacteriostatic effect by slowly releasing silver ions and zinc ions, and the appearance does not change during use, so that the problem of blackening of the existing products in a humid environment is solved.

There is provided a zinc secondary battery including a positive electrode plate including a positive electrode active material layer and a positive electrode current collector; a negative electrode plate including a negative electrode active material layer containing at least one selected from the group consisting of zinc, zinc oxide, a zinc alloy, and a zinc compound, and a negative electrode current collector; a hydroxide ion conductive separator that separates the positive electrode plate and the negative electrode plate so as to make hydroxide ions conductable; and an electrolytic solution. The electrolytic solution is an aqueous solution containing an alkali metal hydroxide including at least sodium hydroxide, and a total concentration of the alkali metal hydroxide in the electrolytic solution is from 5.0 to 6.0 mol / L, and a concentration of the sodium hydroxide in the electrolytic solution is from 0.5 to 6.0 mol / L.