WO2021045489A1 - Procédé de récupération d'or utilisant des micro-ondes - Google Patents

Procédé de récupération d'or utilisant des micro-ondes Download PDF

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WO2021045489A1
WO2021045489A1 PCT/KR2020/011718 KR2020011718W WO2021045489A1 WO 2021045489 A1 WO2021045489 A1 WO 2021045489A1 KR 2020011718 W KR2020011718 W KR 2020011718W WO 2021045489 A1 WO2021045489 A1 WO 2021045489A1
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gold
filter paper
acidic solution
concentrate
microwaves
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PCT/KR2020/011718
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English (en)
Korean (ko)
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박천영
이종주
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조선대학교산학협력단
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/04—Obtaining noble metals by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for recovering gold from concentrates using microwaves.
  • Gold produced from epithermal deposits in the Haenam-Jindo region of Korea has been reported to exist as a native gold in Arsenian pyrite mines (Kim and Choi, 2009).
  • Arsenian pyrite which is produced as an alloyed quartz vein, is produced as Arsenian pyrite ore containing arsenic, and at the same time, gold is calculated in an invisible state.
  • As volatilized during the firing process is oxidized and converted to As 2 O 5 through As 2 O 3 , As 2 O 5 combines with hematite to form FeAsO 4 , which is a dense ferric arsenate.
  • the reason for the melting of the concentrate is that microwave energy is concentrated in a specific area of the sample and appears as a hot spot (Yoshikawa et al., 2012).
  • An embodiment of the present invention is to provide a gold recovery method using a microwave having a short recovery time since gold can be recovered by a simple method through a filtration process after mixing a concentrate containing gold and an acidic solution and irradiating microwaves. do.
  • An embodiment of the present invention is to provide a method for recovering gold using microwaves in which only impurities are dissolved by mixing concentrate in an acidic solution and gold is not dissolved, so that undissolved gold can be recovered using a filter paper.
  • the concentrate and acid solution are irradiated with microwave to heat the concentrate and acid solution at the same time, thereby improving the recovery efficiency of gold and recovering gold remaining in the solid residue with a filter paper.
  • An embodiment of the present invention is to provide a gold recovery method using microwaves in which gold can be easily recovered from concentrate through a microwave and a filtering device, and thus the recovery cost can be low.
  • An embodiment of the present invention is to provide a gold recovery method using microwaves capable of recovering high purity gold by increasing the dissolution concentration of impurities contained in the concentrate as the concentration of the acidic solution increases.
  • the gold recovery method using a microwave comprises the steps of mixing a concentrate containing gold in an acidic solution; Forming an elution solution containing gold not dissolved in the acidic solution and a solid residue by irradiating microwaves to the acidic solution mixed with the concentrate; And filtering the elution solution and the solid residue through a filtering device.
  • the concentrate further contains impurities, and in the step of mixing the concentrate containing gold into an acidic solution, the impurities are dissolved in the acidic solution, In the step of forming an elution solution and a solid residue containing gold not dissolved in the acidic solution by irradiating microwaves to the acidic solution mixed with the concentrate, the gold may be dispersed in the form of nanoparticles in the elution solution. have.
  • the acidic solution may be nitric acid (HNO 3 ).
  • the concentration of the acidic solution may be 1M to 6M.
  • the acidic solution in which the concentrate is mixed may be irradiated with microwaves for 700 seconds to 720 seconds.
  • the frequency of the microwave may be in the range of 2.4 GHz to 2.5 GHz.
  • the filtering device may include a filter paper, and the pore size of the filter paper may be 1 ⁇ m to 2 ⁇ m.
  • the filtering device may perform filtration at a pressure of 5,000 Pa to 5,500 Pa.
  • the gold may be adsorbed on the surface of the filter paper or the wall of the pores.
  • gold can be recovered by a simple method through a filtration process after mixing a concentrate containing gold and an acidic solution, irradiating with microwaves, and a short recovery time.
  • concentrates are mixed in an acidic solution to dissolve only impurities and do not dissolve gold, so that undissolved gold can be easily recovered with a filter paper.
  • the recovery efficiency of gold can be improved, and the gold remaining in the solid residue can be easily recovered with a filter paper.
  • gold can be easily recovered from the concentrate through a microwave and a filtering device, so that the recovery cost can be low.
  • the dissolution concentration of impurities contained in the concentrate increases, so that high-purity gold can be recovered.
  • FIG. 1 is a flow chart showing a gold recovery method using microwaves according to an embodiment of the present invention.
  • FIG. 2A is an image showing the appearance of a filter paper before filtering an acidic solution irradiated with microwaves according to an embodiment of the present invention
  • FIG. 2B is an image showing an acidic solution irradiated with microwaves according to an embodiment of the present invention. After that, it is an image showing the appearance of the first filter paper
  • FIG. 2C is an image showing the appearance of the second filter paper after filtering the acidic solution irradiated with microwaves according to an embodiment of the present invention.
  • FIG. 3 is a graph showing a weight reduction rate of a solid residue by concentration of an acidic solution after irradiation with microwaves in an acidic solution in which concentrates are mixed according to an embodiment of the present invention.
  • FIG. 4 is a graph showing an XRD (x-ray diffraction) pattern of solid residues according to concentrations of an acidic solution according to an embodiment of the present invention.
  • FIG. 5A is a scanning electron microscopy (SEM) image showing a filter paper on which filtration is not performed
  • FIG. 5B is a first filtration when the concentration of the acidic solution irradiated with microwaves is 2M according to an embodiment of the present invention.
  • It is an SEM image showing the shape of the filter paper
  • FIG. 5C is an SEM image showing the shape of the filter paper after first filtering when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 4M
  • FIG. 5D is This is a SEM image showing the appearance of the filter paper after first filtration when the concentration of the acidic solution irradiated with microwaves according to the embodiment of the present invention is 6M.
  • Figure 6a is a cross-sectional scanning electron microscopy (SEM) image showing the state of the filter paper in which filtration has not been performed, and Figure 6b is the first filtered when the concentration of the acidic solution irradiated with microwaves is 2M according to an embodiment of the present invention. It is a cross-sectional SEM image showing the shape of the filter paper after, and FIG.
  • SEM scanning electron microscopy
  • 5C is a cross-sectional SEM image showing the shape of the filter paper after first filtering when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 4M
  • 5D is a cross-sectional SEM image showing the appearance of a filter paper after first filtration when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 6M.
  • FIG. 7A is a stereoscopic microscope image showing a state of a solid residue filtered on a first filter paper when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 2M
  • FIG. 7B is a stereoscopic microscope image according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the second filter paper when the concentration of the acidic solution irradiated with microwaves is 2M
  • FIG. 7C is a concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the third filter paper at 2M.
  • FIG. 8A is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the first filter paper when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 4M
  • FIG. 8B is a stereoscopic microscope image according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the second filter paper when the concentration of the acidic solution irradiated with microwaves is 4M
  • FIG. 8C is the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the third filter paper at 4M.
  • Figure 9a is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the filter paper after the first filtration when the concentration of the acidic solution irradiated with microwaves is 6M according to an embodiment of the present invention
  • Figure 9b is an embodiment of the present invention
  • It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the filter paper after the second filtration when the concentration of the acidic solution irradiated with microwaves is 6M
  • FIG. 9C is an acidic acid irradiated with microwaves according to an embodiment of the present invention.
  • It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the filter paper after the third filtration when the concentration of the solution is 6M.
  • an embodiment As used herein, “an embodiment”, “example”, “side”, “example”, etc. should be construed as having any aspect or design described better than or having an advantage over other aspects or designs. It is not.
  • the term'or' means an inclusive OR'inclusive or' rather than an exclusive OR'exclusive or'. That is, unless stated otherwise or unless clear from context, the expression'x uses a or b'means any one of natural inclusive permutations.
  • the method of recovering gold using microwaves relates to a method of recovering gold from the concentrates by mixing a concentrate containing gold in an acidic solution and then irradiating with microwaves.
  • the gold recovery method using microwaves according to the present invention can simultaneously heat a concentrate containing gold and an acidic solution through microwave irradiation, so that only the impurities contained in the concentrate are dissolved by the acidic solution and gold is not dissolved, so that gold is recovered.
  • the efficiency can be improved, and the recovery time is shortened and the recovery cost is very low compared to the conventional method.
  • FIG. 1 is a flow chart showing a gold recovery method using microwaves according to an embodiment of the present invention.
  • the gold recovery method using a microwave is a step of mixing a concentrate containing gold in an acidic solution (S110), by irradiating microwaves to the acidic solution in which the concentrate is mixed. And forming an elution solution containing gold not dissolved in the acidic solution and a solid residue (S120), and filtering the elution solution and the solid residue through a filtering device (S130).
  • the concentrate includes gold and impurities, and may be at least one of pyrite and non-ferrite containing gold according to an exemplary embodiment.
  • the gold may be invisible gold, and even if it is contained in the concentrate, it may be gold that is not identified with an optical microscope or an electron microscope. That is, the presence of gold is not confirmed through a microscope, but may be invisible gold that can be determined through chemical analysis.
  • the impurities may be made of a material that is dissolved in an acidic solution or is not dissolved in an acidic solution.
  • the concentrate is mixed with the acidic solution so that impurities contained in the concentrate may be dissolved in the acidic solution, and impurities not dissolved in the acidic solution may exist as solid residues.
  • the impurities included in the concentrate are substances other than gold, and are at least among sulfur (S), copper (Cu), zinc (Zn), tellurium (Te), lead (Pb), arsenic (As), and bismuth (Bi). Any one may be included, and the material is not limited thereto.
  • the acidic solution may be nitric acid (HNO 3 ), but is not limited to the material.
  • the acidic solution is a nitric acid solution for convenience of description.
  • the gold recovery method using microwaves can efficiently recover gold from the concentrate by adjusting the concentration of the nitric acid solution.
  • the concentration of the nitric acid solution may be 1M to 6M.
  • concentration of the nitric acid solution is less than 1M, impurities in the concentrate are not sufficiently dissolved, so that the efficiency of recovering gold from the concentrate may be lowered.
  • the concentration of the nitric acid solution is 6M
  • the amount of gold recovered is the maximum, so when the concentration of the nitric acid solution exceeds 6M, the economic efficiency of the recovery cost decreases.
  • the mixing ratio of the concentrate and the nitric acid solution may be set differently depending on the constituents of the concentrate.
  • step S120 the nitric acid solution in which the concentrate is mixed is heated by microwave irradiation, and only the impurities contained in the concentrate are dissolved by the nitric acid solution, and the gold contained in the concentrate is not dissolved.
  • step S120 since the gold has a property that does not dissolve in the nitric acid solution, gold that is not dissolved by the nitric acid solution due to microwave irradiation may be dispersed in the size of nanoparticles in the nitric acid solution.
  • an elution solution including gold not dissolved in the nitric acid solution and impurities dissolved in the nitric acid solution may be formed.
  • Impurities insoluble in the nitric acid solution may exist as a solid residue in the nitric acid solution, and gold may be mixed with impurities insoluble in the nitric acid solution to form a solid residue.
  • gold not dissolved in the nitric acid solution in step S120 may be included in both the elution solution and the solid residue.
  • the recovery efficiency of gold may vary depending on the temperature of the nitric acid solution in which the concentrate is heated when microwaves are irradiated to the nitric acid solution in which the concentrate is mixed.
  • step S120 the temperature at which the nitric acid solution mixed with the concentrate is heated may be controlled by adjusting the microwave irradiation time or the frequency of the microwave, and accordingly, the recovery efficiency of gold may vary.
  • the nitric acid solution in which the concentrate is mixed may be heated by irradiating microwaves for 700 seconds to 720 seconds, and preferably, the nitric acid solution in which the concentrate is mixed may be irradiated with microwaves for 720 seconds. It can have maximum gold recovery efficiency.
  • the frequency of the microwave may be in the range of 2.4 GHz to 2.5 GHz, and preferably, the microwave having a frequency of 2.45 GHz may be irradiated to obtain maximum gold recovery efficiency.
  • Step S130 is a process of recovering gold by filtering the elution solution and the solid residue using a filtering device in order to recover gold from the elution solution and the solid residue.
  • the filtration device may include a filter paper and a vacuum pump, and filtration may be performed by applying pressure to the filter paper by connecting the filter paper to the vacuum pump.
  • the solid residue remains on the filter paper and the elution solution passes through the filter paper.
  • the gold contained in the elution solution and the solid residue is not only invisible as invisible gold, but also has a size in the nanometer unit so that it is difficult to observe even with a microscope.
  • the filter paper Since the gold having a very small size can easily pass through the filtering device, in order to recover gold from the solid residue, the filter paper has pores smaller than the size of the solid residue, so that the solid residue can be filtered from the elution solution as much as possible. It is desirable to be able to separate the gold from the solid residue.
  • a filter paper having the smallest pore size may be used to filter out solid residues and gold as much as possible.
  • the pore size of the filter paper may be 1 ⁇ m to 2 ⁇ m.
  • the filtration device may perform filtration at a pressure of 5,000 Pa to 5,500 Pa, and preferably may perform filtration at a pressure of 5,300 Pa.
  • the filtering device may be filtered in a vacuum state.
  • At least one filter paper may be provided, and three filter papers may be provided according to the embodiment to improve the efficiency of recovering gold from the solid residue.
  • Gold contained in the elution solution and the solid residue has a very small size and passes through the pores of the filter paper, and some solid residues smaller than the pore size of the filter paper among the solid residues may also pass through the pores of the filter paper. .
  • a part of the gold or a part of the solid residue may be adsorbed to the pore wall of the filter paper or the surface of the filter paper.
  • step S130 does not recover gold from the elution solution and solid residues that have passed through the filter paper, but gold adsorbed on the pore wall of the filter paper while the elution solution passes through the filter paper and the solid remaining after being filtered by the filtering device. It can be said to be the process of recovering the gold contained in the residue.
  • the gold since the gold is not dissolved but dispersed in the elution solution, it can be recovered as solid particles on the filter paper.
  • step S130 while the elution solution and the solid residue are continuously filtered and passed through the filter paper, the solid residue having a size smaller than the pore size of the filter paper and the gold are accumulated and adsorbed on the pore wall of the filter paper to prevent internal fouling. Can be formed.
  • a solid residue having a size larger than the pore size of the filter paper may block the pores of the filter paper to form surface fouling.
  • a cake layer in which surface fouling is accumulated may be formed on the surface of the filter paper.
  • the shape of the cake layer is deformed when pressure is continuously applied to the filter paper in step S130, and the porosity of the cake layer is significantly reduced due to the deformation of the cake layer.
  • step S130 the filtration rate of the elution solution may be reduced due to a decrease in the porosity of the cake layer formed on the surface of the filter paper.
  • the gold and silver particles contained in the elution solution and the solid residue may still pass through the cake layer having a reduced porosity due to the very small size of the particles, and the filter paper pores in which the internal fouling is formed may still pass. Accordingly, the gold may be adsorbed to the internal fouling.
  • step S130 the gold and silver cake layer and filter paper pass through the surface of the cake layer, the pore surface of the cake layer, the surface of the inner fouling, the surface of the pores of the inner fouling, the surface of the filter paper or the pores of the filter paper. It can be adsorbed to the wall.
  • step S130 some of the gold contained in the elution solution and the solid residue is adsorbed to the surface of the filter paper or the pore wall of the filter paper, and in the latter part of step S130, the surface of the cake layer formed due to the accumulation of surface fouling. , It is adsorbed to the pore surface of the cake layer, the surface of the inner fouling, the pore surface of the inner fouling, the surface of the filter paper, or the pore wall of the filter paper, thereby improving the gold recovery efficiency.
  • the gold recovery method using microwaves not only increases the possibility of gold recovery by improving the recovery efficiency of gold by irradiating microwaves, but also uses the principle that gold is adsorbed to the filtration device. This can increase the efficiency of gold recovery.
  • the Erlenmeyer flask was connected to a condenser and water at 20°C was circulated.
  • the microwave oven was operated to form an elution solution containing gold not dissolved in the nitric acid solution and a solid residue.
  • the generated NO gas was discharged through a condenser, four gas washing bottles each having a volume of 20 L, an activated carbon adsorption device, and a duct.
  • the first bottle was empty, each of the two bottles was filled with 1.0L of distilled water, and the remaining bottles were used in an empty state.
  • the elution solution and solid residue contained in the Erlenmeyer flask were all transferred to a filtration device and then filtered by operating a vacuum pump.
  • Gold was recovered from the concentrate in the same manner as in [Example 1], except that a nitric acid solution having a concentration of 2M was used.
  • Gold was recovered from the concentrate in the same manner as in [Example 1], except that a nitric acid solution having a concentration of 3M was used.
  • Gold was recovered from the concentrate in the same manner as in [Example 1], except that a nitric acid solution having a concentration of 4M was used.
  • Gold was recovered from the concentrate in the same manner as in [Example 1], except that a nitric acid solution having a concentration of 5M was used.
  • Gold was recovered from the concentrate in the same manner as in [Example 1], except that a nitric acid solution having a concentration of 6M was used.
  • a method for recovering gold using microwaves according to an embodiment of the present invention is summarized by process conditions as shown in Table 1 below.
  • FIG. 2A is an image showing the appearance of a filter paper before filtering an acidic solution irradiated with microwaves according to an embodiment of the present invention
  • FIG. 2B is an image showing an acidic solution irradiated with microwaves according to an embodiment of the present invention. After that, it is an image showing the appearance of the first filter paper
  • FIG. 2C is an image showing the appearance of the second filter paper after filtering the acidic solution irradiated with microwaves according to an embodiment of the present invention.
  • the first filter paper refers to the filter paper that is first contacted when the elution solution and solid residue formed by microwave irradiation are transferred to the filter device (hereinafter, referred to as the first filter paper), and the second filter paper is the first filter paper to retain the elution solution and solid It is positioned so as to contact the other side of the surface that first contacts water (hereinafter, referred to as the second filter paper), and the third filter paper is positioned so that the second filter paper contacts the other side of the first filter paper (hereinafter, the third filter paper).
  • the second filter paper and the third filter paper did not show the solid residue as well as the first filter paper, but it can be seen that the solid residue remained on the surface of the filter paper or the pore wall.
  • An atomic absorption spectrometer was used to analyze the impurity components contained in the concentrates used in Examples 1 to 6, and as a result, iron (Fe), copper (Cu), lead (Pb), zinc (Zn), Arsenic (As) was observed and bismuth (Bi) was not measured.
  • the temperature of the elution solution of Example 1 is 65.10°C
  • the temperature of the elution solution of Example 2 is 72.80°C
  • the temperature of the elution solution of Example 3 is 84.10°C
  • Example 4 The temperature of the elution solution of was 84°C
  • the temperature of the elution solution of Example 5 was 86.50°C
  • the temperature of the elution solution of Example 6 was 79.40°C.
  • FIG. 3 is a graph showing a weight reduction rate of a solid residue by concentration of an acidic solution after irradiation with microwaves in an acidic solution in which concentrates are mixed according to an embodiment of the present invention.
  • the solid residue of Example 1 was 18%
  • the solid residue of Example 2 was 40%
  • the solid of Example 3 It can be seen that the residue was 46%
  • the solid residue of Example 4 was 45%
  • the solid residue of Example 5 was 49%
  • the solid residue of Example 6 had a weight reduction ratio of 52%.
  • FIG. 4 is a graph showing an XRD (x-ray diffraction) pattern of solid residues according to concentrations of an acidic solution according to an embodiment of the present invention.
  • A is adularia
  • Ch is chalcopyrite
  • F is fluorite
  • G is gypsum
  • M is muscovite
  • Q quartz. it means.
  • fluorspar which is one of the impurities contained in the concentrate, may be produced by a reaction as shown in Scheme 5 below. (Ibrahim and El-Hussaini, 2007)
  • the nitric acid solution which is an acidic solution according to an embodiment of the present invention, does not dissolve gold contained in the concentrate, so that gold can be easily recovered.
  • gold which is not dissolved in the nitric acid solution, exists as a solid in the elution solution, although it has a size smaller than the pore size of the filter paper, it is adsorbed to the surface of the filter paper, the pore wall of the filter paper, internal fouling, and the surface of the cake layer and the pore surface. It may remain on the filter paper.
  • the elution solution and solid residues according to Examples 2, 4 and 6 were filtered through a filter paper, and then SEM and EDS analysis were performed on the surface and cross section of the filter paper. Performed.
  • FIG. 5A is a scanning electron microscopy (SEM) image showing a filter paper on which filtration is not performed
  • FIG. 5B is a first filtration when the concentration of the acidic solution irradiated with microwaves is 2M according to an embodiment of the present invention.
  • It is an SEM image showing the shape of the filter paper
  • FIG. 5C is an SEM image showing the shape of the filter paper after first filtering when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 4M
  • FIG. 5D is This is a SEM image showing the appearance of the filter paper after first filtration when the concentration of the acidic solution irradiated with microwaves according to the embodiment of the present invention is 6M.
  • FIG. 5A it can be seen that a fibrous shape is observed on the surface of the filter paper on which filtration has not been performed.
  • Table 4 summarizes the results of EDS analysis on the same area of the filter paper that has not been filtered and the surfaces of the first filter papers according to Example 2, Example 4, and Example 6.
  • gold which is present in the solid phase in the elution solution, passes through the filter paper together with the elution solution, it is adsorbed to the pore walls of the filter paper and forms internal fouling.
  • the gold contained in the elution solution and the solid residue of the present invention remains adsorbed to the end face of the filter paper when filtration is performed by the filter paper.
  • Figure 6a is a cross-sectional scanning electron microscopy (SEM) image showing the state of the filter paper in which filtration has not been performed, and Figure 6b is the first filtered when the concentration of the acidic solution irradiated with microwaves is 2M according to an embodiment of the present invention. It is a cross-sectional SEM image showing the shape of the filter paper after, and FIG.
  • SEM scanning electron microscopy
  • 5C is a cross-sectional SEM image showing the shape of the filter paper after first filtering when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 4M
  • 5D is a cross-sectional SEM image showing the appearance of a filter paper after first filtration when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 6M.
  • FIG. 7A is a stereoscopic microscope image showing a solid residue filtered on a first filter paper when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 2M
  • FIG. 7B is a microscopic image according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the second filter paper when the concentration of the acidic solution irradiated with waves is 2M
  • FIG. 7C is a concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 2M. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the third filter paper.
  • the first filter paper was 3,339.60 g/t
  • the second filter paper was 673.81 g/t
  • the third filter paper was 136.59 g/t. It can be confirmed that the gold of the was recovered.
  • FIG. 8A is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the first filter paper when the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention is 4M
  • FIG. 8B is a stereoscopic microscope image according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the second filter paper when the concentration of the acidic solution irradiated with microwaves is 4M
  • FIG. 8C is the concentration of the acidic solution irradiated with microwaves according to an embodiment of the present invention. It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the third filter paper at 4M.
  • the first filter paper was 2,526.10 g/t
  • the second filter paper was 31.36 g/t
  • the third filter paper was 25.25 g/t. It can be confirmed that the gold of the was recovered.
  • Figure 9a is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the filter paper after the first filtration when the concentration of the acidic solution irradiated with microwaves is 6M according to an embodiment of the present invention
  • Figure 9b is an embodiment of the present invention
  • It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the filter paper after the second filtration when the concentration of the acidic solution irradiated with microwaves is 6M
  • FIG. 9C is an acidic acid irradiated with microwaves according to an embodiment of the present invention.
  • It is a stereoscopic microscope image showing the appearance of gold particles adsorbed on the filter paper after the third filtration when the concentration of the solution is 6M.
  • the first filter paper was 7,355.50 g/t
  • the second filter paper was 159.26 g/t
  • the third filter paper was 147.06 g/t. It can be confirmed that the gold of the was recovered.
  • the concentration of the nitric acid solution is 4M rather than 2M
  • the amount of gold recovered tends to increase when the amount of gold recovered is lower, but when the concentration of the nitric acid solution is 6M, the amount of gold recovered tends to increase. It is due to the nugget effect that clumps together.
  • the gold recovery method using microwaves not only improves the recovery efficiency of gold by irradiating microwaves, but also increases the possibility of gold recovery.
  • the recovery efficiency can be improved.

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  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé de récupération d'or utilisant des micro-ondes. Un procédé de récupération d'or utilisant des micro-ondes, selon un mode de réalisation de la présente invention, comprend les étapes consistant à : mélanger, dans une solution acide, des concentrés comprenant de l'or ; irradier, avec des micro-ondes, la solution acide mélangée avec les concentrés, ce qui permet de former un résidu solide et un éluat contenant de l'or, qui n'est pas dissous dans la solution acide ; et filtrer l'éluat et le résidu solide à travers un dispositif de filtration.
PCT/KR2020/011718 2019-09-05 2020-09-01 Procédé de récupération d'or utilisant des micro-ondes WO2021045489A1 (fr)

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KR20060018021A (ko) * 2004-08-23 2006-02-28 요업기술원 보레이트 광물로부터 마이크로웨이브를 이용한 붕산을추출하는 제조방법
US20090049954A1 (en) * 2007-08-24 2009-02-26 Basf Catalysts Llc Simplified process for leaching precious metals from fuel cell membrane electrode assemblies
KR20130057490A (ko) * 2010-10-12 2013-05-31 센젠 젬 하이테크 컴퍼니 리미티드 전자 폐 재료로부터 희귀금속을 재생하는 방법 및 이의 장치
JP2015196848A (ja) * 2014-03-31 2015-11-09 Jx日鉱日石金属株式会社 砒素の処理方法
KR101948527B1 (ko) * 2018-08-27 2019-02-15 심재현 귀금속 추출용 반응기

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KR101972003B1 (ko) 2017-09-07 2019-04-24 고려대학교 산학협력단 마이크로파를 이용한 레드머드로부터의 선택적 금속 이온 추출 및 탄산염 광물화와 자성 분리를 통한 잔류물 내 철 회수법

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US20090049954A1 (en) * 2007-08-24 2009-02-26 Basf Catalysts Llc Simplified process for leaching precious metals from fuel cell membrane electrode assemblies
KR20130057490A (ko) * 2010-10-12 2013-05-31 센젠 젬 하이테크 컴퍼니 리미티드 전자 폐 재료로부터 희귀금속을 재생하는 방법 및 이의 장치
JP2015196848A (ja) * 2014-03-31 2015-11-09 Jx日鉱日石金属株式会社 砒素の処理方法
KR101948527B1 (ko) * 2018-08-27 2019-02-15 심재현 귀금속 추출용 반응기

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