Process for treating anodizing wastewater and waste metal

Abstract

A process for treating anodizing wastewater and waste metal according to an embodiment of the present invention may comprise the steps of: storing anodizing wastewater for each type of acidic wastewater; dissolving the waste metal in the acidic wastewater; generating hydrogen and a metal salt solution by performing an oxidation-reduction reaction of the acidic wastewater and the waste metal; and adding a hydrophilic colloid solution to the metal salt solution.

Description

Treatment process for anodizing wastewater and scrap metal

[0001] The present invention relates to a process for treating wastewater generated in an anodizing process and waste metal generated in the manufacturing process of various metal products.

[0002] Wastewater treatment from the surface treatment industry requires significant facility investment, as well as operational and maintenance costs. Highly acidic wastewater requires additional chemicals to neutralize it by raising the pH and inducing salt precipitation, incurring significant costs. The resulting concentrated sludge is then entrusted to specialized waste management companies for landfill or incineration. The purified water is then discharged into rivers. However, this process is unecologically unproductive and inefficient, as it causes additional environmental pollution. While much of the metal waste is recycled, this process consumes significant energy and generates additional environmental pollution.

[0003] One aspect of the present disclosure is to provide a water-soluble fertilizer that can be absorbed by plants while treating large amounts of acidic wastewater generated from metal waste and anodizing processes.

[0004] One aspect of the present disclosure is to provide high purity hydrogen without carbon dioxide emissions and without requiring separate energy consumption while treating large amounts of acidic wastewater generated from metal waste and anodizing processes.

[0005] The problems to be solved by the present invention are not limited to the problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0006] The process for treating anodizing wastewater and waste metal according to the invention of the present disclosure is

[0007] A step of storing anodizing wastewater by type of acid wastewater;

[0008] A step of dissolving waste metal in the acidic wastewater;

[0009] A step of producing hydrogen and a metal salt solution by performing a redox reaction on the acidic wastewater and the waste metal; and

[0010] A step of adding a hydrophilic colloidal solution to the above metal salt solution;

[0011] Includes.

[0012] A liquid fertilizer is produced by a process for treating anodizing wastewater and waste metal according to the invention.

[0013] Figure 1 is a drawing illustrating a process diagram according to one embodiment.

[0014] FIG. 2 is a diagram illustrating a wastewater utilization section in an anodizing process according to one embodiment.

[0015] Figure 3 is a drawing showing a detailed process diagram according to one embodiment.

[0016] Preferred embodiments of the present invention are described below. However, the embodiments of the present invention may be modified in various ways, and the technical concept of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more fully explain the present invention to those of ordinary skill in the art.

[0017] The terminology used in this application is solely for the purpose of describing specific examples. Therefore, for example, singular expressions include plural expressions unless the context clearly dictates otherwise. Additionally, it should be noted that terms such as "comprise" or "have" used in this application are used to clearly indicate the presence of features, steps, functions, components, or combinations thereof described in the specification, and are not used to preliminarily exclude the presence of other features, steps, functions, components, or combinations thereof.

[0018] Meanwhile, unless otherwise defined, all terms used herein should be considered to have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Therefore, unless explicitly defined herein, specific terms should not be interpreted in an overly idealistic or formal sense. For example, singular expressions herein include plural expressions unless the context clearly indicates otherwise.

[0019] In addition, the terms "about", "substantially", etc. in this specification are used in the sense of or close to the numerical value when manufacturing and material tolerances inherent to the meanings mentioned are presented, and are used to prevent unscrupulous infringers from unfairly using the disclosure contents in which exact or absolute numerical values ​​are mentioned to aid in the understanding of the present invention.

[0020] The process for treating anodizing wastewater and scrap metal is described in detail with reference to the attached drawings below.

[0021] Anodizing is generally performed by placing a metal or component on an anode and electrolyzing it in a dilute acid electrolyte. The oxygen generated at the anode forms an oxide film with excellent adhesion to the base metal. The term "anodizing" is a combination of the words "anode" and "oxidizing." The representative material for anodizing is aluminum (Al), but anodizing is also performed on other metals such as magnesium (Mg), zinc (Zn), titanium (Ti), tantalum (Ta), hafnium (Hf), and niobium (Nb).

[0022] This anodizing process is a degreasing process that removes oil such as cutting oil or tapping oil that remains during processing by immersing the metal in a neutral detergent between pH 7 and pH 9 and a weak alkaline solution at 30-40℃ for about 20-30 minutes (Removing Fat), a water rinsing process to remove foreign substances or stains after degreasing, an etching process that immerses the metal in a 10% sodium hydroxide (NaOH) solution at 60-70℃ for about 1 minute to remove oil and oxide film on the metal surface, a water rinsing process to remove foreign substances or stains after etching, a chemical polishing process to improve the gloss of the product surface, a water rinsing process to remove foreign substances or stains after chemical polishing, a desmutting process that neutralizes and removes smut using a chemical mixed with water and nitric acid (HNO3) in a 1:1 ratio, and a 15-20% concentration sodium hydroxide (NaOH) solution. It includes the anodizing process, which involves treating the product with sulfuric acid (H2SO4), a washing process to remove sulfuric acid from the product, a coloring process to obtain the desired color of the product, and a sealing process as a finishing process.

[0023] Among these, nitric acid (HNO3) used in the desmutting process, phosphoric acid (H2PO4) and sulfuric acid (H2SO4) used in the chemical polishing process, and sulfuric acid (H2SO4) used in the anodizing process can be stored and utilized in the bath according to the type of wastewater in the treatment process of the present invention.

[0024] Additionally, metal waste such as aluminum, magnesium, and zinc sheets and die castings used in mobile phones, notebooks, various machines, construction equipment, and other devices can be utilized as scrap metal in the treatment process of the present invention. Before describing the anodizing wastewater and scrap metal treatment process, a description of the drawings will be provided.

[0025] FIG. 1 is a drawing showing a process diagram for a process for treating anodizing wastewater and scrap metal according to one embodiment, FIG. 2 is a drawing showing a wastewater utilization section in an anodizing process, and FIG. 3 is a drawing showing a detailed process diagram for a process for treating anodizing wastewater and scrap metal according to one embodiment.

[0026] Referring to FIG. 1, a process for treating anodizing wastewater and waste metal according to one embodiment includes the steps of storing anodizing wastewater according to the type of acidic wastewater; dissolving waste metal in the acidic wastewater; generating hydrogen and a metal salt solution by performing a redox reaction on the acidic wastewater and the waste metal; and adding a hydrophilic colloidal solution to the metal salt solution; and stirring and filtering the metal salt solution and the hydrophilic colloidal solution; adding a component including at least one of nitrogen (N), phosphorus (P), sulfur (S), boron (B), potassium (K), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), molybdenum (Mo), chlorine (Cl), calcium (Ca), sodium (Na), silicon (Si), selenium (Se), cobalt (Co), or vanadium (V) after the stirring and filtering steps; adding water and an alkaline agent after the stirring and filtering steps. may include more.

[0027] Referring to the diagram shown in FIG. 2, the core processes in the anodizing process are the Removing Fat process to remove oil such as cutting oil or tapping oil that remains during processing, the etching process to remove oil and oxide film on the metal surface, the chemical polishing process to improve the gloss of the product surface, the desmutting process to neutralize and remove smut, the anodizing process to treat with sulfuric acid (H2SO4) as a chemical, the coloring process to obtain the desired color of the product, and the sealing process as the finishing process. Among these processes, the section where wastewater can be utilized in the anodizing process is the section between the Removing Fat process and the anodizing process, and if wastewater is utilized in the section thereafter, the wastewater contains a high concentration of dyes containing harmful organic compounds when spraying on plants, making it difficult to use as fertilizer.

[0028] Referring to FIG. 3, a process for treating anodizing wastewater and waste metal according to one embodiment may include: adding water and phosphoric acid wastewater to a primary dissolution tank, then adding additional water to adjust the concentration and pH of the phosphoric acid wastewater; adding magnesium (Mg) waste metal to the phosphoric acid wastewater to dissolve the magnesium (Mg) waste metal in the phosphoric acid wastewater; and causing a redox reaction between the phosphoric acid wastewater and the magnesium (Mg) waste metal to generate hydrogen and a high-concentration magnesium (Mg) phosphate solution. In addition, the high-concentration magnesium (Mg) phosphate solution may be transferred to a secondary stirring tank through a transfer pipe, and then a hydrophilic colloid solution containing collagen or agar may be added thereto, and stirring may be performed by a stirring blade so that the phosphate solution and the hydrophilic colloid solution are well mixed, and then filtration may be performed by a paper filter to remove impurities unnecessary for fertilizer production. After the above stirring and filtering process, an alkaline agent such as sodium carbonate (Na2CO3), calcium carbonate (CaCO3), calcium hydroxide (Ca(OH)2), ammonia (NH3) or sodium hydroxide (NaOH) and water are added to adjust the appropriate concentration and pH, and a component including at least one of nitrogen (N), phosphorus (P), sulfur (S), boron (B), potassium (K), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), molybdenum (Mo), chlorine (Cl), calcium (Ca), sodium (Na), silicon (Si), selenium (Se), cobalt (Co) or vanadium (V) is added to produce a liquid fertilizer that meets the specifications.

[0029] Below, an embodiment of a treatment process for anodizing wastewater and scrap metal is described in detail.

[0030] A process for treating anodizing wastewater and scrap metal according to one disclosed embodiment may include a step of storing anodizing wastewater according to the type of acidic wastewater. In this case, the step of storing acidic wastewater according to the type means storing nitric acid (HNO3) used in a desmutting process, phosphoric acid (H2PO4) and sulfuric acid (H2SO4) used in a chemical polishing process, and sulfuric acid (H2SO4) used in an anodizing process in a bath according to the type of wastewater. By storing anodizing wastewater according to the type of acidic wastewater as in the above step, different oxidation-reduction reactions of acidic wastewater can be performed according to the type of scrap metal, and metal salts suitable for the purpose can be produced.

[0031] According to one embodiment of the disclosed method, a process for treating anodizing wastewater and waste metal may include a step of dissolving waste metal in acidic wastewater, a step of dissolving waste metal in a dissolution tank in which wastewater is stored. At this time, the dissolution tank has a hollow cylindrical shape, and an inlet for disposing waste metal is formed on one side of the upper portion thereof, and a separate liquid supply hose is connected to the upper portion thereof so that a liquid such as water or wastewater can be injected through an opening and closing operation.

[0032] A process for treating anodizing wastewater and waste metal according to one disclosed embodiment may include a step of producing hydrogen and a metal salt solution by subjecting the acidic wastewater and the waste metal to a redox reaction. The redox reaction occurs through the exchange of electrons between reactants. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. Different metals have different tendencies to lose electrons and become oxidized. This is referred to as the reactivity of the metal, and a comparison of the reactivity of representative metals is as follows.

[0033] K > Ca > Na > Mg > Al > Zn > Fe > Ni > Sn > Pb > H > Cu > Hg > Ag > Pt > Au

[0034] Here, metals that are more reactive than hydrogen (H) and have a high ionization tendency react with acidic solutions and are oxidized, thereby losing electrons and generating metal salts. When the electrons released from the metal are received and the hydrogen is reduced, gaseous hydrogen (H2(g)) is generated. The present invention can produce environmentally friendly hydrogen and raw materials for manufacturing fertilizers and the like without additional costs by producing hydrogen and a metal salt solution through the above-described oxidation-reduction reaction.

[0035] The process for treating anodizing wastewater and waste metal according to one disclosed embodiment may include a step of adding a hydrophilic colloidal solution to the metal salt solution. In this case, a state in which fine particles larger than molecules or ions are dispersed in a gas or liquid is referred to as a colloidal state, and the entire colloidal state is referred to as a colloid. The present invention may add hydrophilic natural polymer components such as collagen or agar to prevent precipitation of hydrophobic metal salts and improve adhesion when fertilizers are sprayed on plants.

[0036] According to one embodiment of the disclosed process for treating anodizing wastewater and scrap metal, the purity of hydrogen (H2) generated in the redox reaction may be 99% or higher. At this time, the remaining elements in the gas, excluding hydrogen (H2), may be general atmospheric components such as nitrogen (N2), oxygen (O2), argon (Ar), and carbon dioxide (CO2). In addition, hydrogen generated in the redox reaction with a purity of 99% or higher can reduce the cost of separating hydrogen compared to low-purity hydrogen, can increase the output of fuel cells used when utilizing hydrogen, and can lower the failure rate of machines utilizing hydrogen, thereby promoting efficient machine operation.

[0037] The process for treating anodizing wastewater and waste metal according to one disclosed embodiment may further include a step of stirring and filtering the metal salt solution and the hydrophilic colloid solution. At this time, the stirring step may be a step of stirring the metal salt solution with an impeller after transferring it to a stirring tank so that the metal salt solution and the hydrophilic colloid solution are well mixed, or circulating the solution in the stirring tank with a stirring pump. The stirring tank here may be a conventional stirring tank, and according to the present embodiment in which acidic wastewater is used, a stirring tank with a corrosion-resistant lining such as glass is preferable. In addition, the filtering step may include a filtration step of separating a solid content by filtering a solution in which the metal salt solution and the hydrophilic colloid are mixed and transferred to the stirring tank. In the neutralization step, precipitation may be precipitated by bringing the pH toward the neutral side. The amount of precipitation is particularly significant when the polysaccharide is chitin. When using the manufactured fertilizer as a liquid fertilizer, it is preferable to separate the solids by filtration, as sedimentation can reduce the effectiveness of the fertilizer. Furthermore, the separation of the solids can be accomplished using any commonly used method for removing solids from a suspension. For example, filtration may be accomplished using filter paper, filter cloth, membrane filter, filter press, cross-flow filtration, etc., or natural sedimentation or centrifugal sedimentation may be performed. However, the stirring and filtration methods in the stirring and filtration steps are not limited to the examples described above.

[0038] The process for treating anodizing wastewater and waste metal according to one disclosed embodiment may include a hydrophilic colloid solution containing collagen or agar. However, the components contained in the hydrophilic colloid are not limited to the examples described above.

[0039] According to one embodiment of the disclosed process for treating anodizing wastewater and scrap metal, the amount of the hydrophilic colloidal solution added may be 0.2 g / L or more and 0.4 g / L or less. At this time, if the amount of the hydrophilic colloidal solution added is less than 0.2 g / L, a problem may occur in which metal salt molecules that have not reacted with the hydrophilic polymer material precipitate over time due to the low concentration of the hydrophilic colloidal solution. On the other hand, if the amount of the hydrophilic colloidal solution added exceeds 0.4 g / L, the polymers that have not reacted due to the high concentration of the hydrophilic colloidal solution may stick together or decompose, which may cause the generation of an unpleasant odor or the formation of sediments, and may increase the manufacturing cost. For the above reasons, the present invention limits the amount of the hydrophilic colloidal solution added to 0.2 g / L or more and 0.4 g / L or less.

[0040] The process for treating anodizing wastewater and scrap metal according to one embodiment disclosed may further include a step of adding a component comprising at least one of nitrogen (N), phosphorus (P), sulfur (S), boron (B), potassium (K), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), molybdenum (Mo), chlorine (Cl), calcium (Ca), sodium (Na), silicon (Si), selenium (Se), cobalt (Co), or vanadium (V) after the stirring and filtering steps. Here, the step of adding a component according to one embodiment may have a step of adding other components that are more effective as fertilizers. Other ingredients include essential elements such as calcium (Ca), magnesium (Mg), sulfur (S), iron (Fe), manganese (Mn), boron (B), zinc (Zn), nickel (Ni), molybdenum (Mo), copper (Cu), and chlorine (Cl), and useful elements such as sodium (Na), silicon (Si), selenium (Se), cobalt (Co), and vanadium (V), which are elements that help plant growth. At this time, the ingredient addition step is a step to supplement the ingredients so that they can satisfy the fertilizer specifications, and since the desired effect differs depending on the type of fertilizer, the added ingredients and their amounts may differ. For example, according to the process specifications for general fertilizers, the minimum amount (%) of the main ingredients that a Type 4 compound fertilizer (manufactured so that it can be used on the leaves of plants) must contain is 1. The total amount of two or more of the total nitrogen, water-soluble phosphoric acid, and water-soluble potassium must be 10% or more, and the guaranteed ingredient content for each ingredient must be 1.0% or more. 2. It is required that the contents of each of the following components be guaranteed for at least two types (soluble clay: 1.0, soluble manganese: 0.1, soluble boron: 0.05, soluble iron: 0.1, soluble molybdenum: 0.0005, soluble zinc: 0.05, soluble copper: 0.05, soluble lime: 1.0). Therefore, it is necessary to add appropriate components to meet these fertilizer specifications. However, the components added in the above step are not limited to the examples described above.

[0041] The process for treating anodizing wastewater and waste metal according to one disclosed embodiment may further include a step of adding water and an alkaline agent after the stirring and filtering steps. Here, the alkaline agent refers to a neutralizing agent that neutralizes an acid, and a representative example of a solvent for the alkaline agent is water. At this time, the step of adding water and the alkaline agent is for the purpose of lowering the pH of the mixed solution of an acidic metal salt and a hydrophilic colloid. Since the soil properties required for growth of each plant are different, and the pH of the fertilizer required varies depending on the soil properties, the amounts of water and the alkaline agent to be added may be determined by taking this into consideration. For example, lime fertilizer manufactured by adding an alkaline agent containing calcium hydroxide (Ca(OH)2) to acidified soil may be added to the soil to neutralize the soil.

[0042] According to one embodiment of the disclosed method, the treatment process for anodizing wastewater and scrap metal may include the alkaline agent including sodium carbonate (Na2CO3), calcium carbonate (CaCO3), calcium hydroxide (Ca(OH)2), ammonia (NH3), or sodium hydroxide (NaOH). Here, the sodium carbonate (Na2CO3), calcium carbonate (CaCO3), calcium hydroxide (Ca(OH)2), or sodium hydroxide (NaOH) supplies calcium (Ca) or sodium (Na) necessary for the growth of agricultural plants and corrects soil reactions by neutralizing acidic soil, thereby promoting the activity of soil microorganisms and improving the soil environment suitable for plant growth. However, the components included in the alkaline agent are not limited to the examples described above.

[0043] According to one disclosed embodiment, the treatment process for anodizing wastewater and scrap metal may have a pH of 3 or more and 10 or less after the step of adding the water and the alkaline agent. At this time, when manufacturing a liquid fertilizer, considering preservation safety or stability when mixing with other agricultural materials, it is preferable that the pH is 3 or more and 10 or less, and it is more preferable that the pH is 5 or more and 9. When the pH is 3 or more, problems such as precipitation are unlikely to occur when mixing with other agricultural materials, and when the pH is 10 or less, preservation stability is good. However, in the case of the above pH, it may be expanded to a range equivalent to the described range, considering that the pH of the fertilizer required differs depending on the properties of the soil.

[0044] The process for treating anodizing wastewater and waste metal according to one disclosed embodiment may include a metal salt solution generated through the redox reaction that includes at least one of magnesium sulfate, magnesium phosphate, and magnesium nitrate. In this case, the metal salt solution including magnesium sulfate, magnesium phosphate, or magnesium nitrate may be formed by the steps of Mg(s)+H2SO4(aq)→MgSO4(aq)+H2(g), Mg(s)+H3PO4(aq)+nH2O(aq)→Mg(H xPO4)2nH2O(aq)+H2O(g) (wherein x=0,1, or 2 and n is a natural number) or Mg(s)+2HNO3(aq)→Mg(NO3)2(aq)+H2(g) can be a metal salt produced through a redox reaction, and can be used in the production of liquid fertilizer. Here, when magnesium (Mg(s)) waste metal is dissolved in sulfuric acid (H2SO4(aq)) waste water, the magnesium (Mg(s)) waste metal is oxidized and loses electrons, and hydrogen ions receive electrons and are reduced, so hydrogen gas H2(g) is generated, and magnesium sulfate (MgSO4(aq)) metal salt, which is used as a raw material for the production of liquid fertilizer, is produced. Similarly, when magnesium (Mg(s)) waste metal is dissolved in phosphoric acid (H3PO4(aq)) waste water containing water, the magnesium (Mg(s)) waste metal is oxidized and loses electrons, and hydrogen ions are reduced by receiving electrons, generating hydrogen gas H2(g), and magnesium phosphate (Mg(H)), which is used as a raw material for manufacturing liquid fertilizer. x PO4)2nH2O(aq)) metal salt is produced. In this case, three hydrogen ions are combined with phosphoric acid, and when ionized in an aqueous solution, the hydrogen ions fall one by one in stages, so x = 0, 1, or 2 and n is a natural number. In addition, when magnesium (Mg(s)) waste metal is dissolved in nitric acid (HNO3(aq)) waste water, the magnesium (Mg(s)) waste metal is oxidized and loses electrons, and the hydrogen ions are reduced by receiving electrons, so hydrogen gas H2(g) is generated, and magnesium nitrate (Mg(NO3)2(aq)) metal salt, which is used as a raw material for manufacturing liquid fertilizer, is produced.

[0045] According to one embodiment of the disclosed process for treating anodizing wastewater and waste metal, the metal salt solution generated through the redox reaction may include zinc sulfate. At this time, the metal salt solution including zinc sulfate may be a metal salt generated through a redox reaction such as Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g) and may be used in the manufacture of liquid fertilizer. Here, when zinc (Zn(s)) waste metal is dissolved in sulfuric acid (H2SO4(aq)) wastewater, the zinc (Zn(s)) waste metal is oxidized to lose electrons and hydrogen ions are reduced by receiving electrons, so hydrogen gas H2(g) is generated, and magnesium sulfate (ZnSO4(aq)) metal salt, which is used as a raw material for manufacturing liquid fertilizer, is produced.

[0046] According to one embodiment of the disclosed process for treating anodizing wastewater and waste metal, the metal salt solution generated through the redox reaction may include zinc phosphate. At this time, the metal salt solution containing the zinc phosphate may be a metal salt generated through a redox reaction such as 3Zn(s)+2H3PO4(aq)→Zn3(PO4)2(aq)+3H2(g) and may be used in a surface treatment agent. Here, when the zinc (Zn(s)) waste metal is dissolved in the phosphoric acid (H3PO4(aq)) waste water, the zinc (Zn(s)) waste metal is oxidized to lose electrons and hydrogen ions are reduced by receiving electrons, so that hydrogen gas H2(g) is generated, and the zinc phosphate (Zn3(PO4)2(aq)) metal salt used as a raw material for the surface treatment agent is produced. Here, the surface treatment agent means a coating solution mixed with a printability improver, a water-soluble polymer material, or other agents.

[0047] According to one embodiment of the disclosed process for treating anodizing wastewater and waste metal, the metal salt solution generated through the redox reaction may include aluminum sulfate. At this time, the metal salt solution including aluminum sulfate may be a metal salt generated through a redox reaction such as 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) and may be used as a coagulant for wastewater treatment. Here, when aluminum (Al(s)) waste metal is dissolved in sulfuric acid (H2SO4(aq)) wastewater, the aluminum (Al(s)) waste metal is oxidized and loses electrons, and hydrogen ions are reduced by receiving electrons, so that hydrogen gas H2(g) is generated, and aluminum sulfate (Zn3(PO4)2(aq)) metal salt, which is used as a raw material for the coagulant, is produced. Here, the surface treatment agent means a coating solution mixed with a printability improver, a water-soluble polymer material, or other agents. Here, a coagulant for wastewater treatment refers to a chemical used for the purpose of facilitating solid-liquid separation such as sedimentation, filtration, and flotation by combining fine particles and colloidal particles suspended and dispersed in water to form large particles (floc).

[0048] According to one embodiment of the disclosed process for treating anodizing wastewater and waste metal, the metal salt solution generated through the redox reaction may include aluminum phosphate. At this time, the metal salt solution including the aluminum phosphate may be a metal salt generated through a redox reaction such as 2Al(s)+2H3PO4(aq)→Al2(PO4)3(aq)+3H2(g) and may be used as a pigment or filler. Here, when the aluminum (Al(s)) waste metal is dissolved in the phosphoric acid (H3PO4(aq)) waste water, the aluminum (Al(s)) waste metal is oxidized to lose electrons and hydrogen ions are reduced by receiving electrons, so hydrogen gas H2(g) is generated, and the aluminum phosphate (Al2(PO4)3(aq)) metal salt used as a raw material for a pigment or filler is produced.

[0049] Above, the process for treating anodizing wastewater and waste metal according to one embodiment has been described.

[0050] A liquid fertilizer can be produced by a process for treating anodized wastewater and scrap metal according to one disclosed embodiment. In this case, the liquid fertilizer can be diluted 300 to 500 times and applied to the foliar or root surfaces of plants. The liquid fertilizer has a reduced surface tension due to the formation of a protective colloid solution, thereby improving wettability and adhesiveness, thereby enabling the formation of a coating film on the sprayed plant when the fertilizer is sprayed.

[0051] A process for treating anodizing wastewater and waste metal according to one embodiment comprises the steps of: storing anodizing wastewater according to the type of acidic wastewater; dissolving waste metal in the acidic wastewater; producing hydrogen and a metal salt solution by causing a redox reaction between the acidic wastewater and the waste metal; and adding a hydrophilic colloidal solution to the metal salt solution. Through this, wastewater and waste metal generated in the anodizing process can be treated economically and environmentally.

[0052] The above anodizing wastewater and waste metal treatment process may have a purity of 99% or higher of hydrogen generated in the above oxidation-reduction reaction.

[0053] The above process for treating anodizing wastewater and waste metal may further include a step of stirring and filtering the metal salt solution and the hydrophilic colloid solution.

[0054] The above anodizing wastewater and waste metal treatment process may include the hydrophilic colloid solution containing collagen or agar.

[0055] In the above anodizing wastewater and waste metal treatment process, the amount of the hydrophilic colloid solution added may be 0.2 g / L or more and 0.4 g / L or less.

[0056] The above process for treating anodizing wastewater and waste metal may further include a step of adding a component including at least one of nitrogen (N), phosphorus (P), sulfur (S), boron (B), potassium (K), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), molybdenum (Mo), chlorine (Cl), calcium (Ca), sodium (Na), silicon (Si), selenium (Se), cobalt (Co), aluminum (Al), or vanadium (V) after the stirring and filtering steps.

[0057] The above process for treating anodizing wastewater and waste metal may further include a step of adding water and an alkaline agent after the stirring and filtering steps.

[0058] The above anodizing wastewater and waste metal treatment process may include the alkaline agent including sodium carbonate (Na2CO3), calcium carbonate (CaCO3), calcium hydroxide (Ca(OH)2), ammonia (NH3) or sodium hydroxide (NaOH).

[0059] The above anodizing wastewater and waste metal treatment process may have a pH of 3 or more and 10 or less after the step of adding the water and the alkaline agent.

[0060] The above anodizing wastewater and waste metal treatment process may include at least one of magnesium sulfate, magnesium phosphate, or magnesium nitrate in the metal salt solution generated through the above oxidation-reduction reaction.

[0061] The above anodizing wastewater and waste metal treatment process may include a metal salt solution generated through the above oxidation-reduction reaction, which may include zinc sulfate.

[0062] The above anodizing wastewater and waste metal treatment process may include a metal salt solution generated through the above oxidation-reduction reaction, which may include zinc phosphate.

[0063] The above anodizing wastewater and waste metal treatment process may include a metal salt solution generated through the above oxidation-reduction reaction, which may include aluminum sulfate.

[0064] The above anodizing wastewater and waste metal treatment process may include a metal salt solution generated through the above oxidation-reduction reaction, which may include aluminum phosphate.

[0065] The above anodizing wastewater and waste metal treatment process can produce liquid fertilizer by the above treatment process.

[0066] Above, the liquid fertilizer produced by the process for treating anodizing wastewater and waste metal according to one embodiment has been described.

[0067] According to the invention, a process for treating anodizing wastewater and waste metal and a liquid fertilizer produced by the process for treating anodizing wastewater and waste metal can be provided.

[0068] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0069] Although the embodiments of the invention disclosed above have been illustrated and described, the disclosed invention is not limited to the specific embodiments described above, and various modifications may be implemented by a person having ordinary skill in the art to which the disclosed invention pertains without departing from the gist claimed in the claims.

Claims

1. A step of storing anodizing wastewater according to the type of acid wastewater; A step of dissolving waste metal in the above acidic waste water; A step of producing hydrogen and a metal salt solution by performing a redox reaction on the acidic wastewater and the waste metal; and A step of adding a hydrophilic colloidal solution to the above metal salt solution; A process for treating anodizing wastewater and scrap metal, including:

2. In claim 1, A process for treating anodizing wastewater and waste metal, wherein the purity of hydrogen generated in the above redox reaction is 99% or higher.

3. In claim 1, A step of stirring and filtering the above metal salt solution and the above hydrophilic colloid solution; A treatment process for anodizing wastewater and scrap metal, which further comprises:

4. In claim 3, The above hydrophilic colloidal solution is a treatment process for anodizing wastewater and waste metal containing collagen or agar.

5. In claim 3, A process for treating anodizing wastewater and waste metal, wherein the amount of the hydrophilic colloid solution added is 0.2 g / L or more and 0.4 g / L or less.

6. In claim 3, A step of adding a component comprising at least one of nitrogen (N), phosphorus (P), sulfur (S), boron (B), potassium (K), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), molybdenum (Mo), chlorine (Cl), calcium (Ca), sodium (Na), silicon (Si), selenium (Se), cobalt (Co), or vanadium (V) after the stirring and filtering steps; A treatment process for anodizing wastewater and scrap metal, which further comprises:

7. In claim 3, A step of adding water and an alkaline agent after the stirring and filtering steps; A treatment process for anodizing wastewater and scrap metal, which further comprises:

8. In claim 7, The above alkaline agent is sodium carbonate (Na 2 CO 3 ), calcium carbonate (CaCO 3 ), calcium hydroxide (Ca(OH) 2 ), ammonia (NH 3 ) or sodium hydroxide (NaOH) treatment process for anodizing wastewater and waste metal.

9. In claim 8, A process for treating anodizing wastewater and waste metal having a pH of 3 or more and 10 or less after the step of adding the above water and the above alkaline agent.

10. In claim 1, A process for treating anodizing wastewater and waste metal, wherein the metal salt solution produced through the above redox reaction contains at least one of magnesium sulfate, magnesium phosphate, and magnesium nitrate.

11. In claim 1, The metal salt solution produced through the above redox reaction is a treatment process for anodizing wastewater and waste metal containing zinc sulfate.

12. In claim 1, The metal salt solution produced through the above redox reaction is a treatment process for anodizing wastewater and waste metal containing zinc phosphate.

13. In claim 1, The metal salt solution produced through the above redox reaction is a treatment process for anodizing wastewater and waste metal containing aluminum sulfate.

14. In claim 1, The metal salt solution produced through the above redox reaction is a treatment process for anodizing wastewater and waste metal containing aluminum phosphate.

15. In claim 10 or claim 11, Liquid fertilizer produced by the above treatment process.

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