A tungsten-molybdenum adsorption separation method based on bimetallic hydroxides

Abstract

This invention relates to a tungsten-molybdenum adsorption separation method based on a bimetallic hydroxide. The chemical formula of the bimetallic hydroxide is: [M1] 2+ 1‑x M2 3+ x (OH)2] x+ (X n‑ ) x / n • H₂O; wherein, M1 is Co, Zn, Ni, or Mg; M2 is Al; X is NO₃; x is 0.25–0.5; n is 1. This invention utilizes bimetallic hydroxides for the selective adsorption of tungstate ions in a low-concentration tungsten-molybdenum mixed solution, achieving tungsten-molybdenum separation under persulfate conditions, and further enhancing the separation efficiency through light irradiation. Compared with other adsorption separation methods, the tungsten-molybdenum adsorption separation method based on bimetallic hydroxides has advantages such as high separation efficiency, large adsorption capacity, simple preparation, low cost, and environmental friendliness.

Description

Technical Field

[0001] This invention relates to a tungsten-molybdenum adsorption separation method based on bimetallic hydroxides. Background Technology

[0002] Tungsten (W), molybdenum (Mo), and their alloys are rare high-melting-point metallic materials. Due to their unique high melting point, good electrical and thermal conductivity, and superior corrosion resistance and radiation resistance, they are widely used in industries such as electronics, medical, glass, and steel metallurgy. Tungsten and molybdenum resources are widely distributed in nature, but their abundance in the Earth's crust is not high, and they often occur in association with other elements. Because tungsten and molybdenum have similar chemical properties, they often form minerals in nature that are difficult to separate. During mining, a series of physicochemical treatments are required to separate these valuable metallic elements. However, efficient tungsten-molybdenum separation is often difficult to achieve. Moreover, the impurity content in tungsten-molybdenum products significantly affects their performance. For tungsten products, molybdenum is the most difficult impurity element to remove, and for molybdenum products, tungsten is also the most difficult to separate. With the increasing development of industries such as cemented carbide and electronics, the requirements for the impurity content in tungsten products, especially those required for many advanced applications, are becoming increasingly stringent. In the tungsten and molybdenum metallurgy process, when tungsten and molybdenum resources are subjected to heat treatment and leaching, abundant low-concentration Mo and W wastewater can be obtained. Separating and recovering tungsten and molybdenum from this solution is of great significance and has become a serious task for metallurgical engineers. In particular, separating tungsten and molybdenum from multi-component metal ions in wastewater containing low-concentration Mo and W is crucial for practical applications. Summary of the Invention

[0003] This invention first provides a bimetallic hydroxide with the chemical formula:

[0004] [M1 2+ 1-x M2 3+ x (OH)2] x+ (X n- ) x / n H2O,

[0005] Where M1 is Co, Zn, Ni or Mg; M2 is Al; X is NO3; x is 0.25 to 0.5; and n is 1.

[0006] Furthermore, x is 0.25, 0.33, or 0.5.

[0007] This invention provides a bimetallic hydroxide that can be used for the selective adsorption of tungstate ions in low-concentration tungsten-molybdenum mixed solutions, achieving tungsten-molybdenum separation and improving separation efficiency. Compared with other adsorption separation methods, using this bimetallic hydroxide as an adsorbent offers advantages such as high separation efficiency, large adsorption capacity, simple preparation, low cost, and environmental friendliness.

[0008] The present invention also provides a method for preparing the above-mentioned bimetallic hydroxide, comprising: reacting M2(NO3)3, M1(NO3)2 and NaX in the presence of water; wherein, the definitions of M1, M1 and X are the same as those above.

[0009] In some specific instances, M2(NO3)3 and M1(NO3)2 are its hydrates, such as M2(NO3)3·6H2O and M1(NO3)2·6H2O.

[0010] Specifically, the molar ratio of M2(NO3)3, M1(NO3)2 and NaX is (30-100):(100-300):(50-100), or optionally (50-100):(100-150):(70-80), for example 50:100:75.

[0011] Specifically, the preparation method includes:

[0012] Dissolve M2(NO3)3 and M1(NO3)2 in water, then pass nitrogen gas through them to expel the dissolved carbon dioxide, to obtain solution A; dissolve NaX in water, then pass nitrogen gas through them to expel the dissolved carbon dioxide, to obtain solution B.

[0013] Slowly add solution A dropwise to solution B, while simultaneously adding sodium hydroxide solution to maintain the pH of the mixed solution at 10±0.5. After the addition is complete, seal the container, stir, and then allow it to stand for crystallization. After the reaction is complete, centrifuge and collect the precipitate. Dry the precipitate and grind it into powder, which is the bimetallic hydroxide.

[0014] Specifically, the concentration of the sodium hydroxide solution is 1.5-2.5M, for example, 2M.

[0015] Specifically, the stirring time is 0.5-1 hour.

[0016] Specifically, the crystallization is carried out at 80-85°C; the crystallization time is usually 6-10 hours.

[0017] In some specific embodiments, the method for preparing the bimetallic hydroxide includes:

[0018] Take Al(NO3)3·6H2O powder and Co(NO3)2·6H2O powder, dissolve them in water, and pass nitrogen gas through them to remove the dissolved carbon dioxide to obtain solution A; take NaNO3, dissolve it in water, and pass nitrogen gas through it to remove the dissolved carbon dioxide to obtain solution B.

[0019] Solution A was slowly added dropwise to solution B, while 2M sodium hydroxide solution was added dropwise to maintain the pH of the mixed solution at 10±0.5. After the addition was completed, the mixture was sealed and stirred on a magnetic stirrer for 0.5 hours. Then, it was allowed to crystallize in an oven at 80°C for 6 hours. After the reaction was completed, the mixed solution was centrifuged three times in a centrifuge at 3000 rpm and the precipitate was collected. The precipitate was dried in a forced-air drying oven at 60°C for 6 hours and ground into powder, which is the bimetallic hydroxide. The molar ratio of Al(NO3)3·6H2O, Co(NO3)2·6H2O powder, and NaNO3 was 50:100:100.

[0020] The present invention also includes bimetallic hydroxides prepared by the above method.

[0021] The present invention also includes the application of the above-mentioned bimetallic hydroxide in the selective adsorption and classification of tungsten and molybdenum in a tungsten-molybdenum mixed solution.

[0022] Specifically, the application is carried out in the presence of persulfates (e.g., ammonium persulfate or potassium persulfate).

[0023] The present invention also provides a tungsten-molybdenum adsorption separation method, comprising:

[0024] Mix the above-mentioned bimetallic hydroxide, persulfate, and tungsten-molybdenum mixture; then separate the solid and liquid components.

[0025] Specifically, the persulfate is ammonium persulfate or potassium persulfate.

[0026] Specifically, the mass ratio of the bimetallic hydroxide to persulfate is (20:50) to (20:10), for example, 20:50 or 20:10. Under this ratio, persulfate can better promote the selective adsorption of tungstate ions by the bimetallic hydroxide.

[0027] Specifically, the mass ratio of the bimetallic hydroxide to the tungsten-molybdenum mixed solution is (10-50):(500-2000), for example, 20:1000. Under this ratio, the bimetallic hydroxide can more selectively adsorb tungsten, exhibiting a higher separation coefficient. This is mainly because, under this ratio, the adsorption of tungstate by the bimetallic hydroxide is close to saturation, while at smaller or larger ratios, the bimetallic hydroxide may increase the adsorption of molybdenum or be insufficient to adsorb tungsten.

[0028] Specifically, the concentration of tungsten in the tungsten-molybdenum mixed solution is 0.5-2 mM, for example, 1 mM.

[0029] Specifically, after mixing the above-mentioned bimetallic hydroxide, ammonium persulfate, and tungsten-molybdenum mixed solution, the process further includes a stirring step under light irradiation. Specifically, the light irradiation is sunlight or simulated sunlight.

[0030] Studies have found that under light irradiation, bimetallic hydroxides can more selectively adsorb tungsten, mainly because light irradiation accelerates the reaction in the system, generating more adsorption active sites.

[0031] Specifically, after mixing the above-mentioned bimetallic hydroxide, ammonium persulfate and tungsten-molybdenum mixed solution, the step of adjusting the pH of the reaction system to 3-12, preferably 7-11, is also included.

[0032] In some specific instances, the pH of the reaction system is adjusted to 3, 6, 7, 8, 9, 10, 11, or 12.

[0033] Studies have found that under the above pH conditions (especially pH 7-11), bimetallic hydroxides can better selectively adsorb tungsten because, within this pH range, tungsten and molybdenum exist as tungstate and molybdate, respectively, without excessive hydroxyl interference, making it easier for bimetallic hydroxides to selectively adsorb tungstate.

[0034] Specifically, after solid-liquid separation, the resulting liquid is a high-molybdenum solution containing only a low concentration of tungsten. For example, centrifugation can be used.

[0035] Specifically, the tungsten-molybdenum mixed solution is an industrial low-concentration solution, the sources of which include leachate, eluent and wastewater.

[0036] Specifically, the tungsten-molybdenum adsorption separation method includes: adding 20 parts by mass of bimetallic hydroxide and 10 parts by mass of ammonium persulfate to 1000 parts by mass of a mixed solution containing 1 mM tungsten-molybdenum, and stirring under light on a magnetic stirrer for 2 hours; centrifuging the suspension in a centrifuge at 3000 rpm to separate the solid and liquid, and the resulting liquid is a high-molybdenum solution containing only a low concentration of tungsten.

[0037] This invention provides a tungsten-molybdenum adsorption separation method that exhibits good selectivity and excellent separation effect for tungsten in low-concentration tungsten-molybdenum solutions. The method can selectively adsorb tungstate ions in tungsten-molybdenum mixed solutions over a wide pH range, achieving the separation of tungsten and molybdenum. When the tungsten-molybdenum mixed solution is contacted with a bimetallic hydroxide under the influence of persulfate and light, the differences in chemical affinity and adsorption energy cause significant differences in the complexation ability and adsorption capacity of the two compounds on the material surface, achieving selective adsorption of tungstate ions and thus obtaining a molybdenum solution containing only trace amounts of tungsten impurities.

[0038] The tungsten-molybdenum adsorption separation method based on bimetallic hydroxides of this invention has a good tungsten-molybdenum separation effect. The main principle of its high performance is that under the action of persulfate oxidant, adsorption active sites are generated on the surface of bimetallic hydroxides, which generate different adsorption energies for tungsten and molybdenum. The effect is enhanced by light irradiation, which enables the bimetallic hydroxides to selectively adsorb tungstate ions, thereby achieving the separation of tungsten and molybdenum in aqueous solution.

[0039] This invention presents a tungsten-molybdenum adsorption separation method based on bimetallic hydroxides. This method can selectively adsorb and separate tungsten-molybdenum mixed aqueous solutions over a wide pH range. When used for tungsten-molybdenum separation in mixed aqueous solutions, the separation coefficient reaches a maximum of 168.3, with an adsorption capacity of 161.2 mg / g for tungsten and only 4.81 mg / g for molybdenum. This represents an advanced level in the field of tungsten-molybdenum adsorption separation. After adsorption by the bimetallic hydroxides, tungsten can be desorbed by a sodium hydroxide solution of a certain concentration, allowing for the secondary recovery and reuse of the adsorbed tungsten.

[0040] This invention employs a bimetallic hydroxide adsorption separation method for tungsten and molybdenum, which not only solves the problem of stringent separation conditions but also significantly improves the selectivity of the adsorption separation method. This bimetallic hydroxide-based tungsten and molybdenum adsorption separation method has the advantages of selective adsorption separation of tungsten and molybdenum mixed aqueous solutions over a wide pH range, high adsorption capacity, and good separation effect. It can be applied to the separation of low-concentration tungsten in molybdate solutions. The separation method of this invention features a simple adsorbent preparation process, simple experimental equipment, low cost, high efficiency, and is easily commercialized. Detailed Implementation

[0041] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. Where specific techniques or conditions are not specified in the examples, they should be performed according to the techniques or conditions described in the literature in this field, or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased from legitimate channels.

[0042] The adsorption capacity and separation coefficient were calculated by measuring the concentration of W or Mo in the solution using inductively coupled plasma optical emission spectrometry (ICP-OES; PerkinElmer Optima 8300, USA).

[0043] Example 1

[0044] This embodiment provides a bimetallic hydroxide with the chemical formula:

[0045] [Co 2+ 0.67 Al 3+ 0.33 [(OH)2](NO3] - ) 0.33 H2O

[0046] This embodiment also provides a method for preparing the bimetallic hydroxide, as follows:

[0047] Take 0.005 mol Al(NO3)3·6H2O powder and 0.01 mol Co(NO3)2·6H2O powder, dissolve them in 150 ml of water, and purge the solution with nitrogen gas to remove dissolved carbon dioxide, thus obtaining solution A. Take 0.0075 mol NaNO3, dissolve it in 75 ml of water, and purge the solution with nitrogen gas to remove dissolved carbon dioxide, thus obtaining solution B. Then, slowly add solution A dropwise to solution B, while simultaneously adding 2M sodium hydroxide solution to maintain the pH of the mixed solution at approximately 10. After the addition is complete, seal the solution and stir it on a magnetic stirrer for 0.5 h. Then, allow it to crystallize in an oven at 80℃ for 6 h. After the reaction is complete, centrifuge the mixed solution three times in a centrifuge at 3000 rpm / min and collect the precipitate. Dry the obtained precipitate in a forced-air drying oven at 60℃ for 6 h, and grind it into powder to obtain the bimetallic hydroxide.

[0048] This embodiment also provides a tungsten-molybdenum adsorption separation method, including:

[0049] (1) Adsorption: Take 20 parts of the bimetallic hydroxide and 10 parts of ammonium persulfate prepared above according to the mass fraction, add them to 1000 parts of tungsten-molybdenum mixed solution with a tungsten concentration of 1mM, stir under light on a magnetic stirrer for 2 hours to obtain a suspension.

[0050] (2) Separation: Centrifuge the suspension from step (1) at 3000 rpm to separate the solid and liquid. The resulting liquid is a high molybdenum solution containing only a low concentration of tungsten.

[0051] The pH of the suspension in step (1) was adjusted to 3, 6, 7, 8, 9, 10, 11, and 12 respectively, and the concentrations of tungsten and molybdenum in the solution before and after adsorption were measured. The results are shown in Table 1 below.

[0052] It is evident that the separation coefficient of this bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum is the highest at pH 8, reaching 168.3 (the adsorption capacity for tungsten is 161.2 mg / g, while the adsorption capacity for molybdenum is only 4.81 mg / g). Furthermore, the separation coefficient remains above 25 within the pH range of 7-11, indicating that this method has a good tungsten and molybdenum separation effect over a wide pH range.

[0053] Table 1

[0054]

[0055]

[0056] Example 2

[0057] This embodiment provides a bimetallic hydroxide with the chemical formula:

[0058] [Zn 2+0.67 Al 3+ 0.33 [(OH)2](NO3] - ) 0.33 H2O

[0059] This embodiment also provides a method for preparing the bimetallic hydroxide, which differs from Example 1 only in that the Co(NO3)2·6H2O powder is replaced with an equal amount of Zn(NO3)2·6H2O powder.

[0060] This embodiment also provides a tungsten-molybdenum adsorption separation method, which differs from Example 1 only in that: the bimetallic hydroxide prepared in this embodiment is used, and the pH of the suspension in step (1) is adjusted to 8.

[0061] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum was 15.2, and the adsorption capacity for tungsten was 136.2 mg / g.

[0062] Example 3

[0063] This embodiment provides a bimetallic hydroxide with the chemical formula:

[0064] [Mg 2+ 0.67 Al 3+ 0.33 [(OH)2](NO3] - ) 0.33 H2O

[0065] This embodiment also provides a method for preparing the bimetallic hydroxide, which differs from Example 1 only in that the Co(NO3)2·6H2O powder is replaced with an equal amount of Mg(NO3)2·6H2O powder.

[0066] This embodiment also provides a tungsten-molybdenum adsorption separation method, which differs from Example 1 only in that: the bimetallic hydroxide prepared in this embodiment is used, and the pH of the suspension in step (1) is adjusted to 8.

[0067] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum was 33.1, and the adsorption capacity for tungsten was 146.2 mg / g.

[0068] Example 4

[0069] This embodiment provides a bimetallic hydroxide with the chemical formula:

[0070] [Ni 2+ 0.67 Al 3+ 0.33[(OH)2](NO3] - ) 0.33 H2O

[0071] This embodiment also provides a method for preparing the bimetallic hydroxide, which differs from Example 1 only in that the Co(NO3)2·6H2O powder is replaced with an equal amount of Ni(NO3)2·6H2O powder.

[0072] This embodiment also provides a tungsten-molybdenum adsorption separation method, which differs from Example 1 only in that: the bimetallic hydroxide prepared in this embodiment is used, and the pH of the suspension in step (1) is adjusted to 8.

[0073] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum was 13.3, and the adsorption capacity for tungsten was 70.7 mg / g.

[0074] Example 5

[0075] This embodiment provides a bimetallic hydroxide with the chemical formula:

[0076] [Co 2+ 0.75 Al 3+ 0.25 [(OH)2](NO3] - ) 0.25 H2O

[0077] This embodiment also provides a method for preparing the bimetallic hydroxide, which differs from Example 1 only in that 0.01 mol Co(NO3)2·6H2O powder is replaced with 0.015 mol Co(NO3)2·6H2O powder.

[0078] This embodiment also provides a tungsten-molybdenum adsorption separation method, which differs from Example 1 only in that: the bimetallic hydroxide prepared in this embodiment is used, and the pH of the suspension in step (1) is adjusted to 8.

[0079] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum was 178.74, and the adsorption capacity for tungsten was 166.27 mg / g.

[0080] Example 6

[0081] This embodiment provides a bimetallic hydroxide with the chemical formula:

[0082] [Co 2+ 0.5 Al 3+ 0.5 [(OH)2](NO3] - )0.5 H2O

[0083] This embodiment also provides a method for preparing the bimetallic hydroxide, which differs from Example 1 only in that 0.01 mol Al(NO3)3·6H2O powder is replaced with 0.01 mol Al(NO3)3·6H2O powder.

[0084] This embodiment also provides a tungsten-molybdenum adsorption separation method, which differs from Example 1 only in that: the bimetallic hydroxide prepared in this embodiment is used, and the pH of the suspension in step (1) is adjusted to 8.

[0085] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum was 25.78, and the adsorption capacity for tungsten was 129.68 mg / g.

[0086] Example 7

[0087] This embodiment provides a tungsten-molybdenum adsorption separation method, which differs from Embodiment 1 only in that: in step (1), 20 parts of bimetallic hydroxide and 50 parts of ammonium persulfate are taken according to the mass fraction, and the pH of the suspension in step (1) is adjusted to 8.

[0088] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum was 138.75, and the adsorption capacity for tungsten was 160.61 mg / g.

[0089] Comparative Example 1

[0090] This comparative example uses the same tungsten-molybdenum mixed solution as in Example 1.

[0091] The only difference between this comparative tungsten-molybdenum adsorption separation method and Example 1 is that ammonium persulfate is not added in step (1), and the pH of the suspension in step (1) is adjusted to 8.

[0092] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum in this method was 1.76, and the adsorption capacity for tungsten was only 6.54 mg / g.

[0093] Comparative Example 2

[0094] This comparative example uses the same tungsten-molybdenum mixed solution as in Example 1.

[0095] The only difference between this comparative tungsten-molybdenum adsorption separation method and Example 1 is that in step (1), 20 parts of bimetallic hydroxide and 5 parts of ammonium persulfate are taken according to the mass fraction, and the pH of the suspension in step (1) is adjusted to 8.

[0096] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum in this method was 9.48, and the adsorption capacity for tungsten was only 130.38 mg / g.

[0097] Comparative Example 3

[0098] This comparative example uses the same tungsten-molybdenum mixed solution as in Example 1.

[0099] The only difference between this comparative tungsten-molybdenum adsorption separation method and Example 1 is that the adsorption is carried out without light in step (1), and the pH of the suspension in step (1) is adjusted to 8.

[0100] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum in this method was 17.07, and the adsorption capacity for tungsten was only 103.89 mg / g.

[0101] Comparative Example 4

[0102] This comparative example provides a bimetallic hydroxide whose preparation method differs from that of Example 1 only in that 0.01 mol Co(NO3)2·6H2O powder is replaced with 0.005 mol Co(NO3)2·6H2O powder.

[0103] This comparative example uses the same tungsten-molybdenum mixed solution as in Example 1.

[0104] The only difference between this comparative tungsten-molybdenum adsorption separation method and Example 1 is that the bimetallic hydroxide prepared in this comparative example is used, and the pH of the suspension in step (1) is adjusted to 8.

[0105] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum in this method was 25.78, and the adsorption capacity for tungsten was only 129.68 mg / g.

[0106] Comparative Example 5

[0107] This comparative example provides a metal hydroxide whose preparation method differs from that of Example 1 only in that Co(NO3)2·6H2O powder is not added.

[0108] This comparative example uses the same tungsten-molybdenum mixed solution as in Example 1.

[0109] The only difference between this comparative tungsten-molybdenum adsorption separation method and Example 1 is that the metal hydroxide prepared in this comparative example is used, and the pH of the suspension in step (1) is adjusted to 8.

[0110] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum in this method was 1.26, and the adsorption capacity for tungsten was only 25.70 mg / g.

[0111] Comparative Example 6

[0112] This comparative example provides a metal hydroxide whose preparation method differs from that of Example 1 only in that Al(NO3)3·6H2O powder is not added.

[0113] This comparative example uses the same tungsten-molybdenum mixed solution as in Example 1.

[0114] The only difference between this comparative tungsten-molybdenum adsorption separation method and Example 1 is that the metal hydroxide prepared in this comparative example is used, and the pH of the suspension in step (1) is adjusted to 8.

[0115] The concentrations of tungsten and molybdenum in the solution before and after adsorption were measured at pH 8. The separation coefficient of the bimetallic hydroxide for the adsorption and separation of tungsten and molybdenum in this method was 21.76, and the adsorption capacity for tungsten was only 32.90 mg / g.

[0116] The above verification examples demonstrate that the tungsten-molybdenum adsorption separation method based on dual-metal hydroxide proposed in this invention has good tungsten-molybdenum separation effect. It has the advantages of selective adsorption separation of tungsten-molybdenum mixed aqueous solutions in a wide pH range, high adsorption capacity, and good separation effect, and can be used in the field of tungsten-molybdenum resource recovery and separation.

[0117] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for separating tungsten and molybdenum by adsorption, characterized in that, include: A mixed solution of bimetallic hydroxide, persulfate, and tungsten-molybdenum was mixed and stirred under light. Solid-liquid separation; The chemical formula of the bimetallic hydroxide is: [M1 2+ 1-x M2 3+ x (OH)2] x+ (X n- ) x / n ·H2O, Where M1 is Co, Zn, Ni or Mg; M2 is Al; X is NO3; x is 0.25~0.5; n is 1; The mass ratio of the bimetallic hydroxide to the persulfate is (20:50) to (20:10).

2. The tungsten-molybdenum adsorption separation method according to claim 1, characterized in that, The mass ratio of the bimetallic hydroxide to the tungsten-molybdenum mixed solution is (10-50):(500-2000).

3. The tungsten-molybdenum adsorption separation method according to claim 1, characterized in that, x is 0.25, 0.33, or 0.

5.

4. The tungsten-molybdenum adsorption separation method according to claim 2, characterized in that, The persulfate is ammonium persulfate or potassium persulfate; The mass ratio of the bimetallic hydroxide to the persulfate is 20:50 or 20:10; The mass ratio of the bimetallic hydroxide to the tungsten-molybdenum mixed solution is 20:1000.

5. The tungsten-molybdenum adsorption separation method according to claim 1 or 2, characterized in that, The concentration of tungsten in the tungsten-molybdenum mixed solution is 0.5-2 mM.

6. The tungsten-molybdenum adsorption separation method according to claim 5, characterized in that, The concentration of tungsten in the tungsten-molybdenum mixed solution is 1 mM.

7. The tungsten-molybdenum adsorption separation method according to any one of claims 1 to 4, characterized in that, After mixing the bimetallic hydroxide, ammonium sulfate, and tungsten-molybdenum mixture, the reaction system is further adjusted to a pH of 3-12.

8. The tungsten-molybdenum adsorption separation method according to claim 7, characterized in that, Adjust the pH of the reaction system to 7-11.

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