WO2003106083A1 - 金属微粉末の製造方法 - Google Patents
金属微粉末の製造方法Info
- Publication number
- WO2003106083A1 WO2003106083A1 PCT/JP2003/007392 JP0307392W WO03106083A1 WO 2003106083 A1 WO2003106083 A1 WO 2003106083A1 JP 0307392 W JP0307392 W JP 0307392W WO 03106083 A1 WO03106083 A1 WO 03106083A1
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- WO
- WIPO (PCT)
- Prior art keywords
- aqueous solution
- solution
- ions
- reducing agent
- powder
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C5/00—Electrolytic production, recovery or refining of metal powders or porous metal masses
- C25C5/02—Electrolytic production, recovery or refining of metal powders or porous metal masses from solutions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the present invention relates to a method for producing extremely fine metal fine powder.
- a catalyst material Utilizing the characteristics and fineness of a catalyst material, it can be used as a catalyst for the growth of carbon nanotubes, a reaction catalyst for gas chemicals, etc.
- a method for producing such fine metal fine powder there are various production methods such as a gas phase method in which deposition and growth of the metal fine powder are performed in a gas phase, and a liquid phase method in which the metal fine powder is performed in a liquid. Proposed.
- Japanese Patent Laid-Open Publication No. 2008-0816 discloses, as an example of a production method by a gas phase method, the reduction of nickel of nickel by reducing the steam of Uckel chloride in an atmosphere containing sulfur.
- a method for producing a powder is disclosed.
- CVD chemical vapor deposition
- Japanese Patent Laid-Open Publication No. 2011-27909 states that hydrazine, alkali hypophosphite, or borohydride is reduced as an example of the production method by the liquid phase method.
- the metal fine powder produced by the method of ⁇ usually contains about 500 to 2000 ppm of sulfur. For this reason, there is a problem that the purity of the metal fine powder is reduced, and accordingly, characteristics such as conductivity are reduced.
- the metal growth rate is slow, and it is difficult to produce a large amount of fine metal powder at a time because the above-mentioned manufacturing apparatus is a batch type.
- the reaction time needs to be set long because the metal growth rate is low. Therefore, the particle size at the end of the reaction is significantly different between the fine metal powder that precipitates and starts growing at the beginning of the reaction and the fine metal powder that precipitates and starts growing later. Fine metal powders tend to have a broad particle size distribution. For this reason, especially when trying to obtain fine metal powder having a uniform particle size, it is necessary to remove a large amount of particles having a particle size that is too large or too small, resulting in a significant decrease in yield. There is also.
- metal fine powder produced by the gas phase method has a very high production cost, and its application is currently limited.
- the liquid phase method can be implemented at least with a device that stirs the liquid, so the initial cost and running cost of the production equipment are significantly reduced compared to the gas phase method. Can be.
- the metal growth rate is faster than in the gas phase method, and the equipment can be easily enlarged, so that batch production equipment can be mass-produced at once. Further, mass production is possible by using continuous manufacturing equipment.
- the reaction time is set short so that the deposition and growth of a large number of fine metal powders can proceed almost simultaneously and uniformly. Therefore, a fine metal powder having a sharp particle size distribution and a uniform particle size can be produced with a high yield.
- Japanese Patent Publication No. 3108655 discloses titanium trichloride. The manufacturing method used is disclosed.
- a water-soluble compound of a metal element is dissolved in water together with a complexing agent, if necessary, to prepare an aqueous solution. Then, to this aqueous solution, ammonia water or the like is added as a pH adjuster to adjust the pH of the solution. With H adjusted to 9 or more, by adding titanium trichloride as a reducing agent, the reduction effect of oxidation of trivalent titanium ions is used to reduce and precipitate metal element ions. Manufactures fine metal powder.
- the publication discloses that such a manufacturing method can safely produce high-purity metal fine powder containing no impurities.
- An object of the present invention is to produce a finer metal powder of higher purity, which is finer and has a uniform particle size than before, and does not contain impurities, at a lower cost, in a large amount, and safely.
- An object of the present invention is to provide a novel method for producing a fine metal powder.
- the method for producing a metal fine powder of the present invention comprises:
- a water-soluble compound of at least one metal element which is a source of fine metal powder, is added to the aqueous solution of the reducing agent, mixed, and reduced by the reduction action when trivalent titanium ions are oxidized to tetravalent. Reducing and precipitating ions of the metal element to obtain fine metal powder.
- trivalent titanium ions have a function of reducing and precipitating ions of a metal element to grow fine metal powder when oxidized by itself.
- tetravalent titanium ions have a function as a growth inhibitor that suppresses the growth of fine metal powder, according to studies by the inventors.
- aqueous reducing agent solution containing both trivalent and tetravalent titanium ions the two cannot exist completely independently, and a plurality of trivalent and tetravalent ions form a cluster. It is composed and exists as a whole in a hydrated and complexed state. Therefore, in one cluster, the function of reducing and precipitating the metal element ion by trivalent titanium ion to grow the metal fine powder, and the function of forming the metal fine powder by tetravalent titanium ion While the function of suppressing the growth acts on one and the same metal fine powder, the metal fine powder is formed.
- the particle size is smaller and the average particle size is less than 400 nm. It is possible to produce fine metal powder.
- both ions in the cluster cattle described above are changed. Since the strength of the contradictory functions can be adjusted, the average particle size of the produced metal fine powder can be arbitrarily controlled. Further, since the production method of the present invention is a liquid phase reaction and has a high growth rate, the reaction time can be set short so that the deposition and growth of a large number of fine metal powders can proceed almost simultaneously and uniformly. Therefore, a fine metal powder having a sharp particle size distribution and a uniform particle size can be produced with a high yield.
- titanium ions have a very high ionization tendency, they hardly precipitate as metallic titanium when reducing and depositing ions of metal elements.
- the fine metal powder has high purity and excellent properties such as conductivity.
- the total amount of titanium ions present in the liquid hardly changes.
- the metal fine powder is precipitated by the above-mentioned reaction, almost all of the titanium ion is only oxidized to tetravalent. For this reason, if the solution after the reaction is subjected to cathodic electrolysis and a part of the tetravalent titanium is reduced to trivalent, it can be regenerated as an aqueous reducing agent solution any number of times. Can be used.
- Titanium tetrachloride which is the main raw material, is more industrially used than titanium trichloride used in the production method described in the above publication. It has the advantage of being easily available and extremely inexpensive.
- the aqueous solution containing tetravalent titanium ions which was prepared during the first reaction or collected after the previous reaction, was kept at a pH of 7 or less, and then subjected to the next cathodic electrolysis treatment and fine metal powder. Stable because it is used for precipitation of In other words, the pH of the solution fluctuates during the subsequent cathodic electrolysis or during the deposition of fine metal powder.
- _ _ If the pH of the aqueous solution containing tetravalent titanium ions, which is the starting material, is set to 7 or less, fine metal powder can be produced throughout the production process without producing titanium oxide due to hydrolysis. be able to.
- aqueous solution containing tetravalent titanium ion is subjected to cathodic electrolysis to obtain an aqueous solution of a reducing agent
- trivalent titanium ions and tetravalent titanium ions can be used as described above. It is also possible to easily adjust the abundance ratio of titanium ions.
- a finer metal powder having a finer particle size and a uniform particle size than before, and containing no impurities can be produced at lower cost, in a larger amount, and safely. It is possible to do.
- aqueous solution containing tetravalent titanium ions which is the source of the reducing agent aqueous solution
- the tetravalent titanium ion easily reacts with hydroxyl ion (OH—) in water having less chlorine ions than the above range to generate Ti 0 2+ ion.
- OH— hydroxyl ion
- these ions are stable, in most cases, even if the cathodic electrolysis treatment is performed, the reduction reaction of the tetravalent titanium ions in the above-mentioned Ti ⁇ 2 + ions to trivalent does not progress, and the current is applied. Almost all of the amount is spent on the reduction of hydrogen ions and only hydrogen gas is generated.
- T i 0 2 + titanium chloride complex part is replaced with chlorine ions [T i C 1 X (x is 1-4) are formed. Since the tetravalent titanium ions in the titanium chloride complex are in a relatively free state, they can be more easily and efficiently reduced to trivalent by cathodic electrolysis.
- aqueous solution As such an aqueous solution, as described above, it is preferable to use a stable and acidic aqueous solution of titanium tetrachloride, which is easily available and extremely inexpensive.
- Metal elements that can be precipitated by reduction when trivalent titanium ions are oxidized to tetravalent include Ag, Au, Bi, Co, Cu, Fe, In, Ir, Mn, Mo, Ni, Pb, Pd, Pt, Re, Rh, Sn and Zn. If one of these is used as the metal element, the metal --Fine powder can be manufactured. If at least two of the above metal elements are used, a metal fine powder made of an alloy of those metals can be produced.
- the aqueous solution containing tetravalent titanium ions after the deposition of the metal fine powder can be regenerated as a reducing agent aqueous solution by the cathodic electrolysis treatment as described above, and can be used repeatedly for the production of the metal fine powder. Therefore, the production cost of the fine metal powder can be significantly reduced.
- Figure 1 shows that when a metal powder is reduced by reducing metal element ions using an aqueous reducing agent solution containing trivalent titanium ions and tetravalent titanium ions, the trivalent titanium ions Is a graph showing the effect of the ion concentration on the average particle size of the metal fine powder.
- a water-soluble compound of at least one metal element that is the source of the fine metal powder is added to and mixed with the above aqueous reducing agent solution to reduce the trivalent titanium ions when they are oxidized to tetravalent Reducing and precipitating ions of the metal element by action to obtain fine metal powder,
- aqueous solutions prepared in the above step (I) which contain tetravalent titanium ions and whose pH is adjusted to a predetermined value of 7 or less, those prepared at the time of the first reaction, _ _
- aqueous solution prepared at the time of the first reaction there can be mentioned a stable aqueous solution of titanium tetrachloride in hydrochloric acid. Since such an aqueous solution has a pH of 7 or less, it may be used as it is in the next step of cathodic electrolysis, or may be used after adjusting the pH.
- the aqueous solution recovered after the previous reaction (hereinafter referred to as “mixed residual liquid” because of the remaining mixed liquid obtained by mixing the metal element ion with the reducing agent aqueous solution) has a pH of 7 or less. If it is a predetermined value, it may be used as it is in the next step of the cathodic electrolysis, or may be used after adjusting the pH after the cathodic electrolysis. Naturally, if the pH exceeds 7, it may be adjusted to a predetermined value of 7 or less and then used for the cathodic electrolysis.
- the pH of the first aqueous solution and the pH of the remaining mixed solution after the second time are adjusted to a constant value of 7 or less during the cathodic electrolysis treatment. It is desirable to keep them uniform in order to keep the subsequent reaction conditions constant.
- an acid may be simply added.
- the acid is titanium tetrachloride and the same anion as chlorine. It is preferable to use hydrochloric acid having a simple structure.
- an aqueous solution prepared at the time of the first reaction and a mixed residual solution collected after the previous reaction may be used in combination.
- Examples of situations where it is necessary to use a combination thereof include, for example, replenishment of a mixed residual liquid which has been reduced when a metal fine powder is separated with a new aqueous solution.
- the aqueous solution prepared during the first reaction and the mixed residual solution recovered after the previous reaction contain chloride ions at least 4 times the molar number of tetravalent titanium ions, as described above. Is preferred.
- the aqueous solution When an aqueous solution is prepared using titanium tetrachloride as a starting material during the first reaction as described above, the aqueous solution already contains four times the number of moles of chloride ions of titanium ions derived from the above titanium tetrachloride. Have been.
- the aqueous solution of titanium tetrachloride is acidified with hydrochloric acid to stabilize it as described above, the aqueous solution also contains chloride ions derived from such hydrochloric acid. The quantity is sufficient.
- a cathodic electrolytic treatment can easily and efficiently produce a reducing agent aqueous solution containing a mixture of trivalent titanium ions and tetravalent titanium ions. Can be manufactured.
- chlorine ions should be replenished as needed, especially to the mixed solution recovered after the previous reaction. Is preferred.
- a water-soluble compound containing chloride ions may be separately added to the solution.
- hydrochloric acid is used as an acid for lowering the pH of a liquid
- chloride is used as a water-soluble compound of a metal element to be precipitated, as described later.
- the cathodic efficiency which indicates whether or not it was used for the purpose, is only a few percent, but if the mole number of chlorine is 6 times the mole number of tetravalent titanium ions, then the cathode efficiency is 60% and 8 times. Cathode efficiency increases dramatically, such as 95%.
- the number of moles of chloride ions contained in the aqueous solution produced at the time of the first reaction or the mixed residual solution recovered after the previous reaction is more preferably 4 to 10 times the number of moles of tetravalent titanium ions. .
- the above-mentioned aqueous solution or mixed residual solution is subjected to cathodic electrolysis, and a part of tetravalent titanium ions is reduced to trivalent, so that trivalent titanium ions and tetravalent titanium ions are converted.
- a mixed aqueous reducing agent solution is obtained.
- a two-cell electrolytic cell partitioned by an anion exchange membrane which is the same as that used for adjusting the pH, is prepared.
- an aqueous solution or a residual liquid mixture was poured into one of the electrolytic cells, and an aqueous solution of sodium sulfate or the like was charged into the other tank, and the electrode was immersed in both liquids.
- a direct current is passed with the aqueous solution or residual mixture containing titanium ions as the cathode and the sodium sulfate aqueous solution as the anode.
- adjusting the abundance ratio of trivalent titanium ions and tetravalent titanium ions in an aqueous reducing agent solution shows the average particle size of the produced metal fine powder.
- the diameter can be arbitrarily controlled.
- the horizontal axis is the concentration (%) of trivalent titanium ions in the total amount of trivalent and tetravalent titanium ions in the reducing agent aqueous solution at the start of the reaction, and the vertical axis is the metal to be produced. It represents the average particle size (nm) of the fine powder.
- the average particle size of the formed metal fine powder is 400%.
- the average particle size of the metal fine powder gradually decreases as the concentration of trivalent titanium ions decreases and the concentration of tetravalent titanium ions increases.
- concentration of titanium ions 0%, that is, when trivalent titanium ions are no longer present and the total amount becomes tetravalent titanium ions, the reduction reaction does not proceed, so that fine metal powder is not formed, that is, the average particle size is 0 nm It is shown that it becomes.
- FIG. 1 is merely an example, and it is clear from the results of the examples described below that the relationship between the concentration of trivalent titanium ions and the average particle size of the metal fine powder is not limited to that of FIG. is there.
- Example 1 when the concentration of trivalent titanium ions is 60%, the average particle size of the nickel fine powder is 260 nm.
- Example 2 when the trivalent titanium ion concentration was 30%, the average particle size of the nickel fine powder was 150 nm. In each case, the result is shifted to the smaller particle size side than the example in the figure. Also, from the results of Example 1 and Examples 3 to 5, even if the concentration of trivalent titanium ion was constant at 60%, the particle size of the metal fine powder was different if the metal element to be deposited was different. You can also see that it is a value.
- conditions of the cathodic electrolysis treatment such as the pH of the aqueous solution and the time of the electrolysis treatment, may be controlled.
- the longer the time of the cathodic electrolysis treatment the higher the abundance ratio of trivalent titanium ions can be.
- a water-soluble compound of at least one metal element serving as a source of the fine metal powder is added to the aqueous reducing agent solution prepared as described above and mixed. .
- the metal elements include Ag, Au, Bi, Co, Cu, Fe, In, Ir, Mn, Mo, Ni, Pb, Pd, Pt, Re, One or more of Rh, Sn, and Zn can be mentioned.
- water-soluble compounds of these metal elements include various water-soluble compounds such as sulfate compounds and chlorides.
- water-soluble compounds such as sulfate compounds and chlorides.
- chlorine ions should be simultaneously captured, or the effect of ion accumulation in the liquid should be minimized.
- Chloride is preferred as a water-soluble compound.
- the water-soluble compound of the metal element may be directly added to the reducing agent aqueous solution, but in this case, the reaction proceeds first locally around the charged compound, so that the particle size of the fine metal powder is not sufficient. It may be uniform and the particle size distribution may be broadened.
- reaction liquid an aqueous solution dissolved and diluted in water
- a complexing agent may be added to the reaction solution to be added at the first time, if necessary.
- the complexing agent various conventionally known complexing agents can be used.
- the complexing agent having such a function for example Kuen trisodium [Na 3 C 6 H 5 0 7], sodium tartrate [N a 2 C 4 H 4 0 6 ], sodium acetate [Na CH 3 CO 2], Darukon acid [C 6 H 12 0 7], Chio sodium sulfate [Na 2 S 2 0 3], ammonium Nia [NH 3], and Echirenjiamin selected from the group consisting tetraacetate [C 10 H 16 N 2 O 8] And at least one species.
- a part of the mixed residual liquid collected after the previous reaction must be removed before cathodic electrolysis.
- a very small amount is collected and dissolved in a water-soluble compound of the metal element to prepare a replenishment reaction solution.
- the replenishment reaction solution is reconstituted by a cathodic electrolysis treatment to produce a reducing agent aqueous solution. It is preferable to add the By doing so, the concentration of the mixed solution can be kept constant. At this time, the complexing agent is not consumed, and the first addition is present in the solution, so there is no need to supplement.
- the pH of the reducing agent aqueous solution may be adjusted before or after the addition of the reaction solution to the reducing agent aqueous solution.
- an aqueous sodium carbonate solution, an aqueous ammonia solution, an aqueous sodium hydroxide solution, or the like may be added as the pH adjusting agent.
- the adjustment of the pH can be omitted.
- the pH adjustment of the aqueous reducing agent solution can be omitted because the pH of the aqueous solution of the reducing agent is maintained within the range adjusted in the first time. Therefore, in the second and subsequent times, the pH is adjusted by adding a pH adjuster only when the pH is out of the predetermined range, in consideration of preventing the composition of the liquid from changing. It is desirable to do.
- the pH of the reducing agent aqueous solution affects the metal deposition rate, and thus affects the shape of the precipitated metal fine powder.
- the tiny metal fine powder generated in large quantities at the beginning of the reaction is simply polarized into two poles because of its single crystal structure, and many It tends to be in a state of being connected to each other in a chain shape.
- the metal or alloy is further deposited thereon to fix the chain structure, so that the fine powder of the paramagnetic metal becomes chain.
- the metal powder approaches a spherical shape.
- Example 1 Production of nickel fine powder
- a 20% hydrochloric acid acidic aqueous solution of titanium tetrachloride was prepared.
- the amount of titanium tetrachloride is determined by mixing the aqueous solution of the reducing agent obtained by subjecting the aqueous solution to cathodic electrolysis in the next step with the reaction solution described in the next section at a predetermined ratio, and adjusting the pH adjuster or, if necessary, When ion exchange water is added to make a predetermined amount of the mixed solution, the total molar concentration of trivalent and tetravalent titanium ions with respect to the total amount of the mixed solution becomes 0.2 M (mol Z liter).
- the pH of the solution was 4.
- this aqueous solution was injected into one of two electrolytic baths separated by an anion exchange membrane manufactured by Asahi Glass Co., Ltd.
- the other of the above-mentioned electrolytic cells was filled with a 0.1 M aqueous sodium sulfate solution.
- a carbon filter electrode is immersed in each solution, and a 3.5 V DC current is applied under constant voltage control with the aqueous solution side of titanium tetrachloride as the cathode and the sodium sulfate aqueous solution as the anode, and the aqueous solution is subjected to cathodic electrolysis.
- a reducing agent aqueous solution was prepared.
- cathodic electrolysis 60% of the tetravalent titanium ions in the reducing agent aqueous solution were reduced to trivalent, and the pH of the solution became 1.
- Nickel chloride and trisodium citrate were dissolved in ion-exchanged water to prepare a reaction solution.
- the amount of nickel chloride was set so that the molar concentration with respect to the total amount of the mixed solution was 0.16 M.
- the amount of trisodium citrate was also adjusted so that the molar concentration was 0.3 M with respect to the total amount of the mixed solution.
- the aqueous solution of the reducing agent was put into a reaction vessel, and while maintaining the liquid temperature at 50 ° C., the pH of the liquid was adjusted to 5.2 by adding a saturated aqueous solution of sodium carbonate as a pH adjuster under stirring. At the same time, the reaction solution was gradually added, and then ion-exchanged water was added as needed to prepare a predetermined amount of a mixed solution. The reaction solution and ion-exchanged water were added to a solution pre-warmed to 50 ° C.
- the appearance of the above nickel fine powder was photographed using a scanning electron micrograph, and the particle size of all nickel fine powders whose actual dimensions were within the rectangular range of 1-8 At mX 2.4 ⁇ When the average value was obtained by actual measurement, it was 260 nm.
- a small portion of the mixed liquid remaining after the nickel fine powder was separated was gradually added to powdered nickel chloride to prepare a nickel replenishment reaction solution.
- the amount of nickel chloride was determined by adding this replenished reaction solution to the aqueous solution of the reducing agent, which was regenerated by subjecting the remaining mixed solution to the cathodic electrolysis treatment in the next step, to produce a predetermined amount of a new mixed solution.
- the molar concentration was set to 0.16 M with respect to the total amount of the mixed solution.
- the entire remaining amount of the mixed residual liquid was injected into one of the same two-cell electrolytic cells as described above, and the other tank was filled with a 0.1 M molar aqueous solution of sodium sulfate.
- the cathodic electrolysis was performed so that 60% of the tetravalent titanium ions in the total amount of the mixed residual solution were reduced to trivalent, whereby the remaining portion of the mixed residual solution was regenerated as an aqueous reducing agent solution.
- the electrolysis of water proceeds in parallel, and hydrogen ions were consumed, and the pH of the regenerated aqueous reducing agent solution became 7.
- the pH of the mixed residual solution used for regeneration of the aqueous reducing agent solution and preparation of the nickel replenishment reaction solution was adjusted to be 4.0. That is, when the pH of the mixed solution at the end of the previous reaction was 4.0 as described above, the mixed residual solution after collecting the fine metal powder was used as it was, but the pH was higher than 4.0. If the value was too large, the pH was adjusted to 4.0 by adding a hydrochloric acid aqueous solution to the mixed residue. If the pH is lower than 4.0, the mixed residual solution is poured into one of the two-tank electrolyzers described above, and the other has a molarity of 0.1 M in the other electrolyzer. An aqueous sodium solution was added, and the mixture was allowed to stand, and the pH was adjusted to 4.0 by diffusion permeation of hydroxide ions.
- the aqueous solution of the reducing agent regenerated above was placed in a reaction tank, and while maintaining the liquid temperature at 50 ° C, the above-mentioned replenishment reaction liquid was added with stirring to prepare a predetermined amount of a new mixed liquid.
- the pH became 5-6.
- As the replenishment reaction solution a solution preliminarily heated to 50 ° C was added. When the stirring was continued for several minutes while maintaining the liquid temperature at 50 ° C, a precipitate was deposited. The stirring was stopped, the precipitate was immediately separated by mouth, washed with water, and dried to obtain a fine powder.
- the pH of the mixture at the end of the reaction was 4.0. Almost all of the titanium ions in the mixture became tetravalent.
- the composition of the resulting fine powder was measured by ICP emission spectrometry, and it was confirmed that the powder was nickel with a purity of 99.94%.
- the average particle size of the nickel fine powder was measured in the same manner as described above, and it was 260 nm.
- the nickel fine powder manufactured in the second time is on average _ It was confirmed that the particle size was consistent and the particle size distribution was sharp and the particle size was uniform.
- the average particle size was constant at 260 nm, and the particle size difference G 1 G 2 was both within 80% .
- the particle size distribution was sharp and the particle size was uniform. Fine powder could be produced continuously.
- Example 1 to 4.0 After adjusting the pH of the mixed residual solution after the first nickel fine powder was produced in the same manner as in Example 1 to 4.0, if necessary, a small portion of the pH was adjusted to a powdered nickel chloride.
- a nickel replenishment reaction solution was prepared by gradually adding to the Kel. The amount of nickel chloride was determined by adding this replenishment reaction solution to the aqueous solution of the reducing agent, which was regenerated by subjecting the remaining mixed solution to the cathodic electrolysis treatment in the next step, to produce a predetermined amount of a new mixed solution.
- the molar concentration was set to 0.08 M with respect to the total amount of the mixture.
- the entire amount of the remaining mixed liquid was poured into one of the same two-cell electrolytic cells as described above, and the other tank was filled with a 0.1 M aqueous sodium sulfate solution. .
- a carbon felt electrode is immersed in each solution, and a 3.5 V DC current is passed under constant voltage control with the remaining mixed solution side as the cathode and the sodium sulfate aqueous solution as the anode, and the aqueous solution is subjected to cathodic electrolysis. did.
- the cathodic electrolysis treatment was performed so that 30% of tetravalent titanium ions in the total amount of the mixed residual solution were reduced to trivalent, whereby the remaining portion of the mixed residual solution was regenerated as an aqueous reducing agent solution.
- the electrolysis of water also proceeded in parallel, so hydrogen ions were consumed and the pH of the regenerated aqueous reducing agent solution was 6.2.
- the composition of the obtained fine powder was measured by an ICP emission spectrometry, and it was confirmed that the powder was nickel having a purity of 99.9%.
- the average particle size of the nickel fine powder was actually measured in the same manner as described above, and was 150 nm.
- the third and subsequent nickel fine powders were manufactured under the same conditions as the second time.
- the particle size difference G 2 is in the range both 70%, the nickel fine powder particle size distribution is uniform particle size sharp, It could be manufactured continuously.
- a reducing agent aqueous solution having a pH of 1 was prepared in which 60% of tetravalent titanium ions were reduced to trivalent, as in the first preparation of Example 1.
- reaction solution Copper chloride, trisodium citrate and sodium tartrate were dissolved in ion-exchanged water to prepare a reaction solution.
- the amount of copper chloride is determined by mixing the reaction solution with the aqueous solution of the reducing agent described above at a predetermined ratio, and adding a pH adjuster or, if necessary, ion-exchange water to prepare a predetermined amount of a mixed solution. At that time, it was set so that the molar concentration with respect to the total amount of the mixed solution was 0.16M.
- the amounts of trisodium citrate and sodium tartrate were each adjusted so that the molar concentration relative to the total amount of the mixture was 0.15M.
- the aqueous solution of the reducing agent was placed in a reaction vessel, and while maintaining the temperature of the solution at 50 ° C, the pH of the solution was adjusted to 5.2 by adding a 25% aqueous ammonia solution as a pH adjuster with stirring. After the reaction solution was gradually added, ion-exchanged water was further added as needed to prepare a predetermined amount of a mixed solution. The reaction solution was ion-exchanged water that had been previously heated to 50 ° C.
- composition of the obtained fine powder was measured by ICP emission spectrometry, it was confirmed to be copper having a purity of 99.9%.
- the average particle size of the copper fine powder was measured in the same manner as described above, and it was 300 nm.
- Example 3 the fine copper powder produced in Example 3 had a remarkably small particle size, a sharp particle size distribution, and a uniform particle size.
- a reducing agent aqueous solution having a pH of 1 was prepared in which 60% of tetravalent titanium ions were reduced to trivalent, as in the first preparation of Example 1. (Preparation of reaction solution)
- a reaction solution was prepared by dissolving palladium chloride, chloroplatinic acid, trisodium citrate, and sodium tartrate in deionized water.
- the amount of palladium chloride is determined by mixing the reaction solution with the aqueous solution of the reducing agent described above at a predetermined ratio, and adding a pH adjuster or, if necessary, ion-exchanged water to a predetermined amount of the mixture. At the time of preparation, it was set so that the molar concentration relative to the total amount of the mixed solution was 0.06M.
- the amount of chloroplatinic acid was also adjusted so that the molar concentration with respect to the total amount of the mixture was 0.06M.
- the amounts of trisodium citrate and sodium tartrate were both adjusted so that the molar concentration was 0.15 M with respect to the total amount of the mixture.
- the reducing agent aqueous solution is put into a reaction tank, and while maintaining the liquid temperature at 50 ° C., while stirring, a 1N aqueous sodium hydroxide solution as a pH adjusting agent is added to adjust the pH of the liquid to 5.2.
- a 1N aqueous sodium hydroxide solution as a pH adjusting agent is added to adjust the pH of the liquid to 5.2.
- the reaction solution was gradually added, and then ion-exchanged water was further added as needed to prepare a predetermined amount of a mixed solution.
- the reaction solution and the ion-exchanged water that had been heated to 50 ° C. in advance were added.
- composition of the obtained fine powder was measured by ICP emission spectrometry, it was confirmed to be a 50 Pd-50 Pt alloy. Its purity was 99.9%.
- the average particle size of the alloy fine powder was measured in the same manner as described above, and it was 8 nm.
- the palladium-platinum alloy fine powder produced in Example 4 had a remarkably small particle size, a sharp particle size distribution, and uniform particle size.
- a reducing agent aqueous solution having a pH of 1 was prepared in which 60% of tetravalent titanium ions were reduced to trivalent, as in the first preparation of Example 1.
- a reaction solution was prepared by dissolving silver chloride, a 25% aqueous ammonia solution, trisodium citrate, and sodium tartrate in ion-exchanged water.
- the amount of silver chloride was determined by mixing the reaction solution with the aqueous solution of the reducing agent described above at a predetermined ratio, and adding ion-exchanged water as needed to prepare a predetermined amount of the mixed solution.
- the molar concentration was set to 0.24M with respect to the total amount of the mixture.
- the amount of the aqueous ammonia solution was adjusted so that the molar concentration of ammonia with respect to the total amount of the mixed solution was 1.2M. Further, the amounts of trisodium citrate and sodium tartrate were both adjusted so that the molar concentration with respect to the total amount of the mixture was 0.15 M.
- aqueous reducing agent solution is put into a reaction tank, and while maintaining the liquid temperature at 50 ° C, the reaction liquid is gradually added with stirring, and then, if necessary, ion-exchanged water is added to a predetermined amount of the mixed liquid.
- the reaction solution and ion-exchanged water were warmed to 50 ° C in advance.
- composition of the obtained fine powder was measured by an ICP emission spectrometry, it was confirmed to be silver having a purity of 99.9%.
- the average particle size of the silver fine powder was measured in the same manner as described above, and was found to be 100 nm.
- Example 5 had a remarkably small particle size, a sharp particle size distribution, and a uniform particle size.
- nickel chloride, trisodium triacetate, and trisodium citrate were dissolved in ion-exchanged water to prepare an aqueous solution.
- a 25% aqueous ammonia solution was added to the aqueous solution to adjust the pH to 10.0, and then, while maintaining the liquid temperature at 50 ° C and stirring, the titanium trichloride was added in a nitrogen stream.
- a predetermined amount of a mixed solution was prepared by injecting the mixture with a syringe without touching the outside air.
- the molar concentration of each component with respect to the total amount of the mixture was 0.04 M for nickel chloride, 0.1 M for trisodium triacetate, 0.1 M for trisodium tenoate, and 0.1 M for titanium trichloride. 0.4 M.
- the composition of the fine white powder was measured by ICP emission spectrometry, it was titanium oxide.When the amount was weighed, almost all of the titanium ions added to the liquid were precipitated as titanium oxide. It was confirmed that it had.
- the black fine powder was nickel having a purity of 76%.
- the average particle size of the nickel fine powder was measured in the same manner as described above.
- Comparative Example 2 was performed in an attempt to improve Comparative Example 1.
- nickel chloride, trisodium triacetate, and trisodium citrate were dissolved in ion-exchanged water to prepare an aqueous solution.
- a 25% aqueous ammonia solution was added to this aqueous solution to adjust the pH to 10.5.
- a 20% hydrochloric acid aqueous solution of titanium trichloride is injected using a syringe so as not to come into contact with the outside air, and a predetermined amount of the mixed liquid was prepared.
- the molar concentration of each component with respect to the total volume of the mixture was 0.04M for nickel chloride, 0.1M for trisodium triacetate, 0.1M for trisodium citrate, and 0.04M for titanium trichloride. .
- the two-color precipitates were separately collected, washed with water and dried to obtain fine powders of two colors, white and black.
- composition of the fine white powder was measured by ICP emission spectrometry, it was titanium oxide.When the amount was weighed, about 20% of the titanium ions added to the solution were precipitated as titanium oxide. Was confirmed.
- the black fine powder was 92% pure nickel.
Abstract
Description
Claims
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KR1020047020137A KR100917948B1 (ko) | 2002-06-14 | 2003-06-11 | 금속미분말의 제조방법 |
EP03736151A EP1552896B1 (en) | 2002-06-14 | 2003-06-11 | Method for producing fine metal powder |
US10/517,821 US7470306B2 (en) | 2002-06-14 | 2003-06-11 | Method for producing fine metal powder |
DE60310435T DE60310435T2 (de) | 2002-06-14 | 2003-06-11 | Verfahren zur herstellung von feinem metallpulver |
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JP2002174563A JP3508766B2 (ja) | 2002-06-14 | 2002-06-14 | 金属微粉末の製造方法 |
JP2002-174563 | 2002-06-14 |
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US (1) | US7470306B2 (ja) |
EP (1) | EP1552896B1 (ja) |
JP (1) | JP3508766B2 (ja) |
KR (1) | KR100917948B1 (ja) |
CN (2) | CN102350507A (ja) |
DE (1) | DE60310435T2 (ja) |
TW (1) | TWI247637B (ja) |
WO (1) | WO2003106083A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US7242573B2 (en) * | 2004-10-19 | 2007-07-10 | E. I. Du Pont De Nemours And Company | Electroconductive paste composition |
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FI120438B (fi) | 2006-08-11 | 2009-10-30 | Outotec Oyj | Menetelmä metallipulverin muodostamiseksi |
JP2009079239A (ja) * | 2007-09-25 | 2009-04-16 | Sumitomo Electric Ind Ltd | ニッケル粉末、またはニッケルを主成分とする合金粉末およびその製造方法、導電性ペースト、並びに積層セラミックコンデンサ |
JP5407495B2 (ja) * | 2009-04-02 | 2014-02-05 | 住友電気工業株式会社 | 金属粉末および金属粉末製造方法、導電性ペースト、並びに積層セラミックコンデンサ |
WO2010122918A1 (ja) * | 2009-04-24 | 2010-10-28 | 住友電気工業株式会社 | プリント配線板用基板、プリント配線板、及びそれらの製造方法 |
FI124812B (fi) * | 2010-01-29 | 2015-01-30 | Outotec Oyj | Menetelmä ja laitteisto metallipulverin valmistamiseksi |
CN103391824B (zh) * | 2011-02-25 | 2015-11-25 | 株式会社村田制作所 | 镍粉末的制造方法 |
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WO2016117575A1 (ja) | 2015-01-22 | 2016-07-28 | 住友電気工業株式会社 | プリント配線板用基材、プリント配線板及びプリント配線板の製造方法 |
CA3036483C (en) * | 2016-09-12 | 2022-03-22 | Lucky Iron Fish, Inc. | Electrolytic iron cooking implement |
CN107059064A (zh) * | 2016-12-08 | 2017-08-18 | 汤恭年 | 铅酸蓄电池专用纳米铅粉的电生长制粉法 |
CN106757174B (zh) * | 2017-02-23 | 2020-08-21 | 黄芃 | 一种电沉积制备金属粉末的方法 |
CN107955952A (zh) * | 2017-11-02 | 2018-04-24 | 马鞍山市宝奕金属制品工贸有限公司 | 一种利用铁渣生产高纯铁粉的方法 |
CN112719286B (zh) * | 2020-12-22 | 2023-05-30 | 任沁锋 | 一种铜纳米颗粒的制备方法 |
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2003
- 2003-06-11 DE DE60310435T patent/DE60310435T2/de not_active Expired - Lifetime
- 2003-06-11 KR KR1020047020137A patent/KR100917948B1/ko not_active IP Right Cessation
- 2003-06-11 WO PCT/JP2003/007392 patent/WO2003106083A1/ja active IP Right Grant
- 2003-06-11 US US10/517,821 patent/US7470306B2/en active Active
- 2003-06-11 EP EP03736151A patent/EP1552896B1/en not_active Expired - Fee Related
- 2003-06-11 CN CN2011103324437A patent/CN102350507A/zh active Pending
- 2003-06-11 CN CN038138182A patent/CN1662332A/zh active Pending
- 2003-06-13 TW TW092116040A patent/TWI247637B/zh not_active IP Right Cessation
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JPH0488104A (ja) * | 1990-07-31 | 1992-03-23 | Fukuda Metal Foil & Powder Co Ltd | 粒状銅微粉末の製造方法 |
US5435830A (en) * | 1991-09-20 | 1995-07-25 | Murata Manufacturing Co., Ltd. | Method of producing fine powders |
EP1120181A1 (en) * | 2000-01-21 | 2001-08-01 | Sumitomo Electric Industries, Ltd. | Method of producing alloy powders, alloy powders obtained by said method, and products applying said powders |
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US7242573B2 (en) * | 2004-10-19 | 2007-07-10 | E. I. Du Pont De Nemours And Company | Electroconductive paste composition |
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CN102350507A (zh) | 2012-02-15 |
EP1552896A4 (en) | 2005-09-21 |
KR100917948B1 (ko) | 2009-09-21 |
TWI247637B (en) | 2006-01-21 |
JP2004018923A (ja) | 2004-01-22 |
CN1662332A (zh) | 2005-08-31 |
EP1552896A1 (en) | 2005-07-13 |
TW200413120A (en) | 2004-08-01 |
EP1552896B1 (en) | 2006-12-13 |
US20050217425A1 (en) | 2005-10-06 |
DE60310435D1 (de) | 2007-01-25 |
JP3508766B2 (ja) | 2004-03-22 |
DE60310435T2 (de) | 2007-09-27 |
US7470306B2 (en) | 2008-12-30 |
KR20050007608A (ko) | 2005-01-19 |
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