28 results about "Zincate" patented technology

The invention provides an O3 type layered oxide sodium ion positive electrode material and a preparation method and application thereof. The positive electrode material comprises a sodium nickel iron manganese zinc oxide core and a sodium nickel iron manganese zinc oxide shell, in the nickel-iron-manganese-zinc sodium core, zinc accounts for 7%-10% of the total molar weight of nickel-iron-manganese-zinc; in the nickel-iron-manganese-zinc sodium shell, zinc accounts for 1%-5% of the total molar weight of nickel, iron, manganese and zinc; the nickel iron manganese zinc sodium inner core and the nickel iron manganese zinc sodium outer shell respectively and independently comprise a first lattice regulation element; and the nickel iron manganese zinc sodium shell also comprises a second lattice regulation element. The O3 type layered oxide sodium ion positive electrode material is designed to be of a core-shell structure, mutual supporting and mutual coupling are achieved, meanwhile, composition of the inner core and the outer shell is regulated and controlled, slippage between crystal lattice layers is restrained, the cracking problem caused by stress concentration is avoided, the structural stability of the positive electrode material is remarkably improved, and the service life of the positive electrode material is prolonged. And the rate capability and the cycle performance are synchronously improved.

The application discloses a preparation method and application of an alkaline zinc-based flow battery electrolyte, and comprises the following steps: firstly, dissolving a hydroxide solid in deionized water to obtain an alkaline aqueous solution; secondly, dissolving a zinc oxide solid in the alkaline aqueous solution obtained in the step (I) to obtain an alkaline aqueous solution containing a zincate; and finally, dissolving a sugar alcohol and a chloromethane in the alkaline aqueous solution containing the zincate obtained in the step (II) to obtain an alkaline electrolyte. By introducing different concentrations of the sugar alcohol and the chloromethane into the alkaline electrolyte containing the zincate, the double electric layer and the solvation structure of the zinc negative electrode are regulated, the self-corrosion and the hydrogen evolution side reaction problems of the zinc negative electrode under the strong alkaline (pH>14) condition are effectively inhibited, the alkaline electrolyte has good zinc compatibility, high stability and relatively fast reaction kinetics, and has great potential in the development and application of the alkaline zinc-based flow battery.

A rechargeable, proton-insertion battery can include a cathode, an anode, a separator, and an electrolyte. The cathode includes an active material that includes an additive. The additive can include compound(s) forms of elements such as titanium, nickel, bismuth, or combinations thereof. The anode can comprise one or more anode additives that can include insoluble hydroxides, zincates, oxides such as calcium hydroxide, calcium zincate, bismuth oxide, zinc oxide, or combinations thereof.

The present application relates to a kind of nickel-zinc iron ternary oxygen electrode and its preparation method and application, including the following steps: (a) on the conductive substrate, electrodepositing nickel-zinc pre-plating layer is plated;(b) the conductive substrate of the nickel-zinc pre-plating layer of plating is as anode, nickel electrode is as cathode, be placed in the hydroxide aqueous solution containing iron source, under the condition of 70-90 DEG C, anode potential 1.8V~2.2V electrochemical oxidation is carried out.The conductive substrate of the nickel-zinc pre-plating layer of plating is as anode, nickel electrode is as cathode to carry out electrochemical oxidation, so that the metal zinc in pre-plating layer can be anodically dissolved, and soluble zincate ion is generated, so that abundant pore and defect are formed in-situ in electrode interior;Iron ion in electrolyte occurs replacement reaction on dissolved zinc site or exposed nickel site, and is introduced into electrode skeleton;So that more stable, active, and substrate combined firmly Porous ternary nickel-zinc iron composite electrode is finally obtained.

The utility model discloses a diaphragm and a battery, the diaphragm comprises a diaphragm main body and a polytetrafluoroethylene layer arranged on at least one side of the diaphragm main body, and the thickness of the polytetrafluoroethylene layer is 0.01-0.10 mm. In the embodiment, the polytetrafluoroethylene layer is arranged on the diaphragm main body, and the compact structure of the polytetrafluoroethylene layer is distributed on the surface of the diaphragm main body, so that the puncture resistance of the diaphragm main body is enhanced. Therefore, the diffusion of zincate ions can be effectively inhibited, and oxygen generated by the positive electrode during charging can be ensured to smoothly reach the zinc negative electrode for reduction reaction. Besides, due to the arrangement of the polytetrafluoroethylene layer, the diaphragm is endowed with certain hydrophobicity, so that the electrolyte is stably adsorbed in the diaphragm, and the service life of the battery is remarkably prolonged.

The present invention relates to the technical field of batteries, and provides a negative electrode material for a zinc-nickel battery, a preparation method and a negative electrode. The negative electrode material for the zinc-nickel battery includes an active substance, a surfactant, a binder, an additive and a dispersant, and the active substance is a sulfur-doped carbon-coated calcium zincate crystal. The present invention improves the negative electrode material of the zinc-nickel battery, uses sulfur-doped carbon-coated calcium zincate crystals as the active substance, and adds some surfactants, which can effectively improve the dissolution and deposition of zincate, thereby reducing the influence of inactivated zinc particles generated during self-discharge, preventing the influence of dissolved oxygen generated by overcharging of the positive electrode on self-discharge, and improving the service life and efficiency of the electrode.

The invention belongs to the technical field of batteries, and discloses a preparation method of a zinc-nickel secondary battery negative electrode active material. The preparation method comprises the following steps: adding ZnO into a KOH solution of saturated ZnO, uniformly mixing, adding Ca (OH) 2, reacting, and aging to obtain the negative active material of the zinc-nickel secondary battery. A hydrothermal coprecipitation method is adopted, used raw materials comprise calcium hydroxide, zinc oxide, potassium hydroxide and the like, and a calcium zincate crystal generated in the preparation process has a quadrilateral crystal form. The crystal form of calcium zincate can be effectively stabilized by controlling hydrothermal coprecipitation conditions. The solubility of the zinc oxide in an alkaline solution is low and is far lower than that of zinc oxide. And due to the characteristic, the concentration of zincate radicals in the electrolyte is remarkably reduced, so that the growth of negative electrode dendritic crystals is effectively inhibited, and the cycling stability and the service life of the zinc-nickel battery are further improved.

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a calcium zincate modified zinc-nickel secondary battery negative electrode. The negative electrode slurry is prepared by mixing a solid negative electrode active substance zinc oxide, Zn powder, a negative electrode additive calcium zincate and bismuth oxide, a carbon material, a surfactant and an adhesive according to a certain proportion. The solid-phase sheet preparation process of the negative electrode can significantly improve the conductivity of the negative electrode and growth of zinc dendrites. And the double-sided laminated solid-phase negative electrode can better control the load of the negative electrode active material, and ensure the current collection uniformity and the stability of the negative electrode. And the tin-plated cable-stayed net with high conductivity is selected as a substrate material, so that a three-dimensional conductive frame can be constructed in the negative electrode, the utilization rate of active substances is higher, and the structural stability of the pole piece is enhanced. In addition, the high-conductivity carbon material and the organic framework have a synergistic effect to construct an ion-electron mixed conductive framework, so that the capacity and the stability of the pole piece are improved.

The application relates to an environment-friendly cyanide-free zincate zinc plating brightener and a preparation method thereof, and relates to the technical field of metal surface treatment. The brightener comprises the following components in mass fraction: 10-30 parts of sulfonic acid group modified p-chlorobenzaldehyde acetaldehyde, 10-20 parts of conjugated modified anisaldehyde, 15-40 parts of compound auxiliary brightener, 5-15 parts of isomeric tridecanol polyoxyethylene ether, 3-10 parts of polyethylene glycol, 2-8 parts of walking agent and 30-50 parts of ethylene glycol monobutyl ether. The preparation method comprises the following steps: under the condition of water bath heating, the sulfonic acid group modified p-chlorobenzaldehyde acetaldehyde is added into the ethylene glycol monobutyl ether, after uniform stirring, the conjugated modified anisaldehyde, the isomeric tridecanol polyoxyethylene ether, the polyethylene glycol, the compound auxiliary brightener and the walking agent are sequentially added, stirring is conducted after each component is added, the stirring is continuously conducted by increasing the rotating speed after the components are completely added, and the environment-friendly cyanide-free zincate zinc plating brightener is obtained. The application has the effect of improving the dispersion performance of the brightener, and can effectively improve the uniformity and brightening effect of a plating layer.

The application discloses an anti-corrosion and rust-proof water-proof type anti-cracking agent and a preparation method and application thereof, and belongs to the technical field of concrete admixtures. Raw materials of the anti-cracking agent include the following components in percentage by mass: an anti-corrosion and rust-proof component 5-10%, a water-proof self-healing component 15-20%, an expansion component 50-60%, and a dense component 10-30%; the anti-corrosion and rust-proof component includes (10-20):(80-90) of tetrabutylammonium decatungstate and a cathode type rust inhibitor, and the cathode type rust inhibitor includes at least one of zinc phosphate, zinc acetate and calcium zincate. The specific anti-corrosion and rust-proof component tetrabutylammonium decatungstate, zinc phosphate and calcium zincate of the application has excellent anti-corrosion and rust-proof effect; in addition, the anti-corrosion and rust-proof component used in the application can activate the water-proof self-healing component and has a promoting effect on the water-proof self-healing component while improving the anti-corrosion and rust-proof performance, and can significantly improve the secondary impermeability of concrete in cooperation with the water-proof self-healing component.

The invention provides a surface treatment method of a titanium alloy 3D printed part, and belongs to the technical field of surface treatment of 3D printed parts, the method comprises the following steps: sequentially performing first treatment and chemical polishing on the titanium alloy 3D printed part to obtain a surface-treated printed part; the first treatment comprises chemical erosion and micro-arc oxidation which are sequentially carried out; the micro-arc oxidation adopts an electrolyte comprising one or more of the following components by concentration: 1.5-50 g / L of alkali metal hydroxide, 0.5-8 g / L of zincate, 0.2-15 g / L of phosphate and 0.5-5 g / L of aluminate. According to the surface treatment method for the titanium alloy 3D printing piece, the surface roughness of the titanium alloy 3D printing piece can be reduced.

This invention discloses a water-based treatment agent for improving the corrosion resistance of carbon steel surfaces, comprising the following active ingredients: a compound containing zincate ions, wherein the molar concentration of zincate ions is 0.02–0.6 mol / L; a nonionic polyol surfactant, the content of which is 0.05–0.8 mol / L based on the molar concentration of hydroxyl groups; a metal ion compound, wherein the molar concentration of metal ions is 0.003–0.1 mol / L; the standard electrode potential of the metal ions is in the range of -0.28V to +0.42V; and an inorganic alkali, the content of which is 0.001–0.1 mol / L based on the molar concentration of hydroxide ions. This invention also discloses a carbon steel substrate comprising a carbon steel substrate and a nanoscale coating formed by coating or depositing the aforementioned water-based treatment agent on the surface of the carbon steel substrate.

The application provides a surface treatment method of a titanium alloy 3D printed part, and belongs to the technical field of surface treatment of 3D printed parts. The method comprises the following steps: sequentially performing first treatment and chemical polishing on the titanium alloy 3D printed part to obtain the printed part after surface treatment; the first treatment comprises sequentially performing chemical corrosion and micro-arc oxidation; the micro-arc oxidation adopts an electrolyte comprising the following concentration components: one or more of alkali metal hydroxide 1.5-50 g / L and zincate 0.5-8 g / L, phosphate 0.2-15 g / L and aluminate 0.5-5 g / L. The surface treatment method of the titanium alloy 3D printed part provided by the application can reduce the surface roughness of the titanium alloy 3D printed part.

This invention provides a method for preparing nano-zinc oxide loaded on the surface of cellulose fibers such as cotton and ramie. First, the cellulose fibers are alkalized in a 30% sodium hydroxide solution for 2 hours, then dehydrated and dried to obtain alkaline cellulose fibers. These alkaline fibers are then reacted with a 3-chloro-2-hydroxypropyltrimethylammonium chloride solution to obtain cationic cellulose fibers. The cationic cellulose fibers can adsorb negatively charged zincate ions in a sodium zincate solution. Subsequently, in a zinc sulfate solution, sodium zincate and zinc sulfate undergo a double hydrolysis precipitation reaction on the surface of the cellulose fibers to generate zinc hydroxide. Finally, the zinc hydroxide is dehydrated during steaming, further growing to obtain nano-zinc oxide. Because sodium zincate adsorbs on the cation sites of cellulose macromolecules, the cellulose macromolecules constitute a steric hindrance effect on the double hydrolysis precipitation reaction, inhibiting the growth of zinc oxide and promoting the formation of uniformly distributed nano-zinc oxide. Simultaneously, the double hydrolysis reaction can fully utilize the zinc element in sodium zincate and zinc sulfate to grow and prepare nano-zinc oxide, which helps to increase the loading of nano-zinc oxide on the surface of cellulose fibers such as cotton and ramie.

The present application relates to a kind of nickel-zinc iron ternary oxygen electrode and its preparation method and application, including the following steps: (a) on the conductive substrate, electrodepositing nickel-zinc pre-plating layer is plated;(b) the conductive substrate of the nickel-zinc pre-plating layer of plating is as anode, nickel electrode is as cathode, be placed in the hydroxide aqueous solution containing iron source, under the condition of 70-90 DEG C, anode potential 1.8V~2.2V electrochemical oxidation is carried out.The conductive substrate of the nickel-zinc pre-plating layer of plating is as anode, nickel electrode is as cathode to carry out electrochemical oxidation, so that the metal zinc in pre-plating layer can be anodically dissolved, and soluble zincate ion is generated, so that abundant pore and defect are formed in-situ in electrode interior;Iron ion in electrolyte occurs replacement reaction on dissolved zinc site or exposed nickel site, and is introduced into electrode skeleton;So that more stable, active, and substrate combined firmly Porous ternary nickel-zinc iron composite electrode is finally obtained.

The application provides a zinc-nickel battery negative material calcium zincate preparation using a screening device, belongs to the technical field of calcium zincate, and comprises an input shell, a shielding part, a containing shell, a power part, a scattering part and a screening net. The containing shell is a round shell with one open side. The shielding part is arranged on the open side of the containing shell to form a closed containing chamber. The input shell is arranged on the surface of the side of the shielding part farther from the containing shell. The power part is arranged on the containing shell. The scattering part and the screening net are arranged in the containing chamber. The application solves the problem that the scattering of calcium zincate is not thorough enough, and there is generally a slightly large volume, which is not conducive to the screening of calcium zincate and requires secondary treatment after screening.

This application relates to the field of soft magnetic materials, and specifically discloses a high-frequency low-loss soft magnetic material and a preparation method thereof. A preparation method of a high-frequency low-loss soft magnetic material includes the following steps; (1) Mix and dissolve an iron salt, a zincate salt and a manganese salt to obtain a mixed salt solution, then add a rare earth salt solution, and then add a precipitating agent, stir and react, and then filter, wash, dry, calcine and refine the reacted solution to obtain rare earth-doped ferrite powder; (2) Sinter once, crush and screen to obtain a pre-sintered material; (3) Mix four powders of lrO 2 , MoO 2 , CNTs, and BNNT to obtain an intermediate powder; (4) Mix the pre-sintered material, the intermediate powder and a lubricant evenly and then press to form a green body, and then perform secondary sintering on the green body to obtain Mn-Zn soft magnetic ferrite. The ferrite prepared by the preparation method of this application has excellent magnetic properties and low loss at high frequencies.

The present invention relates to the technical field of water electrolysis, and particularly to an electrolyte additive for improving water electrolysis reaction performance, an electrolyte, an electrolyte solution, and a method for improving water electrolysis reaction performance. The additive includes a non-metal oxyacid salt (sulfate, phosphate, borate, selenate, silicate, carbonate, perchlorate, trifluoroacetate, etc.) and an aqueous solution thereof, and an oxometallate (molybdate, tungstate, vanadate, chromate, niobate, ferricyanate, zincate, aluminate, stannate, etc.) and an aqueous solution thereof, as electrolyte solution additives for a water electrolysis reaction. The present invention provides a use of an oxyacid salt for improving the activity and stability of oxygen evolution during water electrolysis. In particular, the oxyacid salt is also suitable for electrolysis reactions carried out at high and low temperatures. Due to the addition of the oxyacid salt, the present invention reduces the oxygen evolution reaction potential and the charge transfer resistance, increases the electron transport rate, and exhibits relatively fast chemical reaction kinetics, thereby facilitating the improvement of the reaction activity.

A process for producing carbon from carbon dioxide, in particular from carbon dioxide obtained from biomass, comprising the steps of: a) reacting zinc oxide with sodium hydroxide to form a solution of sodium tetrahydroxide zincate, in particular by dissolving zinc oxide in sodium hydroxide; b) using the solution from step a) to produce metallic zinc by an alkaline galvanic process in which sodium tetrahydroxide zincate is converted into sodium hydroxide and metallic zinc, preferably using sodium hydroxide obtained therefrom in step a); c) reducing the carbon dioxide, in particular from carbon dioxide obtained from biomass, to carbon monoxide with metallic zinc from step b) as a reducing agent, preferably using zinc oxide obtained therefrom in step a), in particular without treatment;d) reducing the carbon monoxide obtained in step c) and, if appropriate, the residual carbon dioxide present after step c) with metallic zinc from step b), preferably using an iron-containing catalyst, to obtain a mixture of solid carbon and zinc oxide and, if appropriate, the iron-containing catalyst; e) dissolving the zinc oxide in the mixture from step d) by adding sodium hydroxide to form a dispersion comprising sodium tetrahydroxide zincate, solid carbon; f) separating the solid carbon and, if appropriate, the iron-containing catalyst from the dispersion from step e);

A rechargeable alkaline battery includes an anode comprising zinc, a cathode, and separator disposed between the anode and the cathode. The separator comprises a water-insoluble metal hydroxide. For example, the water-insoluble metal hydroxide can be magnesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, or any combination thereof. The separator comprising the water-insoluble metal hydroxide can serve to capture a portion of any zincate ions produced at the anode prior to the zincate ions passing through the separator to the cathode.

The invention belongs to the technical field of trailer part treatment processes, and particularly relates to a trailer part surface enhanced galvanization treatment process which comprises the following steps: performing laser texturing on a trailer ball base body to form a regular micron-sized pit array; preparing a molybdenum or molybdenum alloy transition layer on the surface by adopting an electric spark deposition technology; in a zincate plating solution containing nano-diamond particles modified by a silane coupling agent, depositing a Zn-nano-diamond composite coating on the transition layer by adopting a bidirectional pulse electroplating method; micro-arc oxidation treatment is carried out in a silicate electrolyte, and a layer of zinc oxide ceramic membrane is generated on the surface; carrying out vacuum impregnation hole sealing treatment on the workpiece subjected to micro-arc oxidation by adopting a hole sealing agent containing a pH response type microcapsule; through multi-technology fusion, a gradient composite coating with excellent bonding strength, limit wear resistance, long-acting corrosion resistance and an intelligent self-repairing function is formed on the surface of the hitch ball, the service life of the hitch ball under the extreme working condition is remarkably prolonged, the reliability of the hitch ball under the extreme working condition is remarkably improved, and the whole process is environmentally friendly.

The present invention discloses a zinc-containing sodium-ion cathode material precursor and a preparation method thereof. Instead of preparing a zinc salt solution with a certain concentration in the past, zinc salt is added to excessive alkali solution to form zincate to participate in the co-deposition reaction. The primary particles of the precursor prepared by this method are uniform and have a relatively high tap density. Moreover, the addition of zinc element in the cathode material is beneficial to improving its crystallization degree. Since zinc is a fixed-valence element, it can stabilize the crystal structure of the active material during charge and discharge, preventing the crystal structure from collapsing due to instability during the charge and discharge process, thereby greatly improving the cycle reversibility and discharge specific capacity of the sodium-ion battery.

The invention discloses a curing agent based on a silicon aluminum zincate sol system and a graphite tailing sand curing method. The curing agent comprises a sol solution and ZnO, wherein the sol solution is prepared from any one or a mixture of more than two of sodium water glass or potash water glass, NaOH or KOH, aluminum sulfate, aluminum chloride and aluminum nitrate; when the graphite tailing sand needs to be solidified, the graphite tailing sand with the water content smaller than 30% is taken, the sol solution with the weight being 30%-50% of that of the graphite tailing sand is added, and ZnO with the weight being 3%-8% of that of the graphite tailing sand is added after even stirring; and mold shaping and curing demolding only need 1-2 h at the room temperature. In the preparation process of the curing agent, 'three wastes' are not discharged, the addition amount is small, the cost for curing the graphite tailing sand is relatively low, the strength of a cured product is higher, and the compressive strength of a 30-day sample and the compressive strength of a 90-day sample are 34-45 MPa and 50-66 MPa respectively and are obviously superior to those of an existing curing material.

This invention discloses a method for suppressing water migration in a zinc-iron flow battery by adjusting the volume ratio of the positive and negative electrolytes, belonging to the field of flow battery technology. The positive electrolyte of the zinc-iron flow battery is an alkaline solution of iron cyanide complex ions, and the negative electrolyte is an alkaline solution of zincate ions. The volume ratio of the positive to negative electrolyte is 0.5-5:1; preferably 1-4:1; more preferably 2-4:1. The alkalinity of both the positive and negative electrolytes is 0.05-5 mol / L. This invention can effectively suppress water migration during the operation of the zinc-iron flow battery, improve its lifespan, and reduce maintenance costs during battery operation.

The invention relates to the field of ceramic tile firing, in particular to a process for preparing a ceramic tile through a dry method. The technology for preparing the ceramic tile through the dry method comprises the following steps that 1, quartz ore waste residues, bauxite waste residues, mining waste soil, an additive and water are mixed and ground for 6-7 h, and a mixture is obtained; the additive is at least one of sodium metasilicate, potassium feldspar, sodium phytate and calcium zincate; 2) performing spray drying on the mixture obtained in the step 1) to obtain granules; 3, the granules obtained in the step 2 are subjected to compression molding, drying, glazing and firing, and the ceramic tile is obtained.According to the preparation method, tailing waste and tailings of different components are utilized and reasonably matched and optimized, the ceramic tile with excellent performance is prepared, and meanwhile the environmental protection property, the high performance and the economical efficiency are comprehensively improved.

The invention discloses a method for controlling and blocking growth of zinc dendrites based on ion supply and a high-stability nickel-zinc battery constructed based on the method. Specifically, in an alkaline zinc electrochemical system, a composite electrolyte system with a gel layer-electrolyte membrane layer-gel layer sandwich structure is constructed. In a composite electrolyte system, the gel layers on the two sides provide electrolyte maintenance and interface stability, and the middle electrolyte membrane layer forms a barrier layer for polyhydroxy anions such as zincate radicals and the like, so that an ion migration path is regulated and controlled in a battery operation process, and the penetration risk of metal zinc deposition to the diaphragm is blocked. The positive electrode material can be matched with a nickel-cobalt layered double hydroxide positive electrode material which is doped with high-charge-density metal ions and is regulated and controlled by a Co / Ni ratio for use, a constructed nickel-zinc battery can be recycled for more than 3000 times under high current density (5A. G <-1 >), the capacity retention ratio exceeds 75%, and diaphragm puncture failure caused by dendritic crystals does not occur in a long-term operation process.

The invention discloses an electrogalvanizing method for a weathering-resistant steel high-strength bolt. The electrogalvanizing method comprises the following steps that (1) the weathering-resistant steel high-strength bolt is sequentially subjected to degreasing, rust removing and activating treatment; (2) the bolt is added into an alkaline zincate plating solution to be subjected to electrogalvanizing, and the alkaline zincate plating solution comprises, by concentration, 8-15 g / L of zinc oxide, 80-120 g / L of sodium hydroxide, 12-20 g / L of triethanolamine, 0.5-1 g / L of low-hydrogen composite brightener, 0.5-1 g / L of zinc oxide, 0.5-1 g / L of zinc oxide and the balance zinc oxide. The low-hydrogen composite brightener is prepared from 4-methylbenzalacetone, a polyoxyethylene polyoxypropylene block copolymer, imidazoline quaternary ammonium salt and fatty amine polyoxyethylene ether. And (3) hydrogen removal treatment is conducted, and then sealing treatment is conducted through a chromium-free silicate sealing agent.The obtained electrogalvanized weathering-resistant steel high-strength bolt product has the characteristics of being low in hydrogen embrittlement, high in corrosion resistance, environmentally friendly and the like, and the applicability is wide.

A method for the production of carbon from carbon dioxide, in particular from biomass derived carbon dioxide, comprises the steps of: a) reacting zinc oxide with sodium hydroxide to form a solution of sodium tetra hydroxido zincate, especially by dissolving zinc oxide in sodium hydroxide; b) the solution of step a) is used to produce metallic zinc by an alkaline galvanic process in which sodium tetra hydroxide zincate is converted to sodium hydroxide and metallic zinc, wherein, preferably, therewith gained sodium hydroxide is used in step a); c) reducing the carbon dioxide, in particular from biomass derived carbon dioxide, to carbon monoxide with metallic zinc of step b) as reduction agent, wherein, preferably, therewith gained zinc oxide is used in step a), in particular without any treatment; d) reducing the carbon monoxide gained in step c), and optionally any residual carbon dioxide present after step c), with metallic zinc of step b), preferably using a ferrum containing catalyst, to obtain a mixture of solid carbon and zinc oxide, and optionally the ferrum containing catalyste); e) dissolving the zinc oxide in the mixture of step d) by adding sodium hydroxide in order to form a dispersion comprising sodium tetra hydroxido zincate, solid carbon; f) separating the solid carbon, and optionally the ferrum containing catalyst, from the dispersion of step e)