Method for recovering valuable metal from waste material
By mixing broken biomass waste with ionic liquid and red mud, using ionic liquid to catalyze the combination of lignin with valuable metals in red mud, the problem of valuable metal recycling in red mud is solved and the recycling of high-value products is achieved , reducing recycling costs.
Patent Information
- Application Number
- CN202411247956.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2024-12-13
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The prior art is difficult to effectively recover valuable metals in red mud, resulting in waste of resources and high recycling costs.
By mixing the broken biomass waste with ionic liquid and red mud, reacting under light conditions, the ionic liquid and metal oxides in the red mud catalyzed the biomass waste to release lignin, so that it can be used in the red mud. Valid metals combine to form precipitates, thereby achieving recovery of the valuable metals.
It effectively reduces the recycling cost and obtains high-value lignocellulose precipitates adsorbing valuable metals, and obtains high-value products such as valuable metals and lignin through further separation.
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Figure CN119120906A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of waste treatment, and in particular, to a method for recovering valuable metals from waste. Background Art
[0002] Red mud is industrial solid waste discharged when the aluminum industry extracts alumina. It is called red mud because it contains a large amount of iron oxide and looks similar to red soil. In addition to iron, red mud also contains some valuable metals, such as scandium, yttrium and other rare earth metal elements. Therefore, how to recover the valuable metals in red mud is a very worthy research topic. Summary of the invention
[0003] In response to the above technical problems, the present application provides a method for recovering valuable metals from waste materials, which can effectively recover high-value products.
[0004] The present application provides a method for recovering valuable metals from waste materials, comprising:
[0005] A crushing step, crushing the biomass waste to obtain crushed materials, wherein the biomass waste includes lignocellulose;
[0006] A decomposition step, mixing the crushed material, the ionic liquid and the waste material, and reacting them under light conditions to obtain a mixture, wherein the waste material includes red mud, and the mixture includes a precipitate adsorbed with valuable metals;
[0007] The separation step is to separate the mixture to separate the precipitate adsorbed with the valuable metals from the mixture to obtain the precipitate adsorbed with the valuable metals.
[0008] According to any of the aforementioned embodiments of the present application, the mass ratio of the crushed material, the ionic liquid and the red mud is (1-3): (1-2): (2-8).
[0009] According to any of the aforementioned embodiments of the present application, the mass ratio of the crushed material, the ionic liquid and the red mud is (1-2):1:(5-7).
[0010] According to any of the aforementioned embodiments of the present application, the mass ratio of the crushed material to the red mud is 1:(3-7).
[0011] According to any of the foregoing embodiments of the present application, the biomass waste includes at least one of straw, rice husk, stem and leaf.
[0012] According to any of the foregoing embodiments of the present application, the crushed material has a mesh size of 500-1000.
[0013] According to any of the foregoing embodiments of the present application, the ionic liquid comprises a basic ionic liquid.
[0014] According to any of the foregoing embodiments of the present application, the alkaline ionic liquid includes one or more alkaline anions selected from hydroxide, alkoxide and alkyl carbonate, and an organic quaternary ammonium cation.
[0015] According to any of the aforementioned embodiments of the present application, the reaction temperature in the decomposition step is 40°C-60°C.
[0016] According to any of the foregoing embodiments of the present application, the separation step specifically includes:
[0017] The mixture is centrifuged using a cyclone to obtain a precipitate adsorbing valuable metals.
[0018] The present application provides a method for recovering valuable metals from waste materials, which includes a crushing process, wherein the biomass waste is crushed to obtain a crushed material, wherein the biomass waste includes lignocellulose; a decomposition process, wherein the crushed material, ionic liquid and the waste are mixed and reacted under light conditions to obtain a mixture, wherein the waste includes red mud, and the mixture includes a precipitate adsorbed with valuable metals; a separation process, wherein the mixture is separated to separate the precipitate adsorbed with valuable metals from the mixture to obtain the precipitate adsorbed with valuable metals. The above technical solution is to mix the crushed biomass waste with ionic liquid and red mud, and use the ionic liquid and metal oxides in the red mud to release lignin from the biomass waste, and the lignin can be combined with the valuable metals in the red mud to form a precipitate, so that the biomass waste can be effectively utilized to reduce the recycling cost, and high-value products can be recovered, that is, lignocellulose precipitate adsorbed with valuable metals, and the precipitate can be further separated to obtain high-value products such as valuable metals and lignin.
[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used to illustrate the preferred embodiments and are not to be considered as limiting the present application. In the accompanying drawings:
[0021] Figure 1A schematic flow chart of a method for recovering valuable metals from waste materials provided in an embodiment of the present application is shown. DETAILED DESCRIPTION
[0022] As used herein, "a", "the", "at least one" and "one or more" are used interchangeably. Thus, for example, a coating composition comprising "a" additional additive can be interpreted to mean that the coating composition comprises "one or more" additional additives.
[0023] For simplicity, some numerical ranges are disclosed herein, however, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and any upper limit can be combined with any other upper limit to form an unspecified range. In addition, although not explicitly stated, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unspecified range.
[0024] The above-mentioned summary of the invention of the present application is not intended to describe each disclosed embodiment or each implementation in the present application. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of embodiments, which can be used in various combinations. In each example, the enumeration is only used as a representative group and should not be interpreted as exhaustive.
[0025] See also Figure 1 As shown, the present application provides a method for recovering valuable metals from waste materials, comprising:
[0026] S100, a crushing step of crushing the biomass waste to obtain crushed materials, wherein the biomass waste includes lignocellulose;
[0027] S200, a decomposition step, mixing the crushed material, the ionic liquid and the waste material, and reacting them under light conditions to obtain a mixture, wherein the waste material includes red mud, and the mixture includes a precipitate adsorbed with valuable metals;
[0028] S300, a separation step, performing separation treatment on the mixture to separate the precipitate adsorbed with the valuable metal from the mixture to obtain the precipitate adsorbed with the valuable metal.
[0029] The above technical solution mixes crushed biomass waste with ionic liquid and red mud, and uses the metal oxides in the ionic liquid and red mud to release lignin from the biomass waste. The lignin can combine with the valuable metals in the red mud to form a precipitate. This can not only effectively utilize the biomass waste to reduce the recycling cost, but also recover high-value products, namely, wood cellulose precipitates adsorbed with valuable metals. The precipitate can be further separated to obtain high-value products such as valuable metals and lignin.
[0030] In an embodiment of the present application, biomass waste includes lignocellulose, and the cell walls of the biomass waste are decomposed by catalyzing metal oxides in red mud under ionic liquid and light to release lignocellulose, wherein selecting suitable biomass waste can make it contain more lignocellulose, and crushing it to a suitable mesh size range can help release lignocellulose.
[0031] In a possible implementation, the biomass waste may include at least one of straw, rice husk, stem and leaf. The above biomass waste can have more lignocellulose and is easy to obtain, further reducing the recycling cost.
[0032] In a possible embodiment, the crushed material has a mesh size of 500-1000, so that the crushed material has a larger specific surface area, which can increase the reaction area and help decompose the cell wall of the crushed material to release cellulose.
[0033] In the above embodiments, the crushing can be performed using an instrument well known in the art, such as an ultrafine pulverizer.
[0034] In the embodiments of the present application, the mass ratio of the crushed material, the ionic liquid and the red mud is within a suitable range, which can help release the lignocellulose in the crushed material.
[0035] In a possible implementation manner, the mass ratio of the crushed material, the ionic liquid and the red mud is (1-3): (1-2): (2-8).
[0036] In another possible implementation, the mass ratio of the crushed material, the ionic liquid and the red mud is (1-2):1:(5-7).
[0037] In one possible implementation, the mass ratio of crushed material to red mud is 1:(3-7).
[0038] In a possible embodiment, the ionic liquid includes an alkaline ionic liquid, which can help the alkaline ionic liquid to synergistically decompose cell walls with metal oxides in red mud.
[0039] In one possible embodiment, the basic ionic liquid includes one or more basic anions selected from the group consisting of hydroxide, alkoxide, and alkyl carbonate, and an organic quaternary ammonium cation.
[0040] In a possible implementation, the reaction temperature in the decomposition step is 40°C-60°C.
[0041] In a possible implementation, the separation step specifically includes:
[0042] S310, using a cyclone to centrifuge the mixture to obtain a precipitate adsorbed with valuable metals.
[0043] Example
[0044] The following examples more specifically describe the contents disclosed in the present application, and these examples are only used for illustrative explanations, because it is obvious to those skilled in the art that various modifications and variations are made within the scope of the present application's disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available and can be used directly without further processing.
[0045] Example 1
[0046] This embodiment provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0047] 1000g corn stalks were crushed to obtain 500-mesh crushed material;
[0048] The crushed material, 1000 g of ionic liquid and 3000 g of red mud waste are mixed, and reacted under light conditions and at 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0049] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0050] Example 2
[0051] This embodiment provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0052] 1000g corn stalks were crushed to obtain 500-mesh crushed material;
[0053] The crushed material, 1000 g of ionic liquid and 5000 g of red mud waste are mixed, and reacted under light conditions and at 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0054] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0055] Example 3
[0056] This embodiment provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0057] 1000g corn stalks were crushed to obtain 500-mesh crushed material;
[0058] The crushed material, 1000 g of ionic liquid and 8000 g of red mud waste are mixed, and reacted under light conditions and at 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0059] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0060] Example 4
[0061] This embodiment provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0062] 1000g corn stalks were crushed to obtain 500-mesh crushed material;
[0063] The crushed material, 2000 g of ionic liquid and 3000 g of red mud waste are mixed, and reacted under light conditions and at 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0064] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0065] Example 5
[0066] This embodiment provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0067] 1000g corn stalks were crushed to obtain 1000-mesh crushed material;
[0068] The crushed material, 1000 g of ionic liquid and 3000 g of red mud waste are mixed, and reacted under light conditions and at 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0069] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0070] Example 6
[0071] This embodiment provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0072] 1000g corn stalks were crushed to obtain 500-mesh crushed material;
[0073] The crushed material, 1000 g of ionic liquid and 3000 g of red mud waste are mixed, and reacted under light conditions and at 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0074] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0075] Comparative Example 1
[0076] This comparative example provides a method for recovering valuable metals from waste materials, comprising the following steps:
[0077] 1000g corn stalks were crushed to obtain 500-mesh crushed material;
[0078] The crushed material and 3000 g of red mud waste are mixed, and reacted under light conditions and 40° C. to obtain a mixture, wherein the ionic liquid includes a methane oxide anion and an organic quaternary ammonium cation, and the components of the red mud are as follows: Al2O3 15%, SiO25%, Fe2O3 30%, CaO 10%, Na2O 1%, TiO22%, Sc 2%, and the rest are unavoidable impurities;
[0079] The mixture is centrifuged using a cyclone to separate a precipitate adsorbed with Fe, Al, Ti and Sc from the mixture to obtain a precipitate.
[0080] Test Section
[0081] (1) Lignocellulose test
[0082] The Folin-Ciocardio (FC) reagent was diluted at a ratio of 1:9, and 0.3 mL of the diluted FC reagent was added to 0.3 mL of the mixture prepared in the embodiment and the comparative example. After 8 min, 0.5 mL of 20 vol% sodium carbonate solution was added to the above mixture to develop color. After 1 h, the absorbance in the mixture was measured using a UV-visible spectrophotometer to determine the lignin concentration. The test results are shown in Table 1.
[0083] (2) Metal concentration test
[0084] The metal concentration in the mixture was measured by spectrophotometry, and the test results are shown in Table 1.
[0085] Table 1 Test results of Examples 1-6 and Comparative Example 1
[0086] Serial number Lignocellulose concentration (g / L) Al(g / L) Fe(g / L) Ti(g / L) Sc(g / L) Example 1 40.23 0.83 1.74 0.06 0.05 Example 2 45.54 1.26 2.54 0.08 0.07 Example 3 49.66 2.41 4.82 0.16 0.14 Example 4 42.15 0.85 1.78 0.07 0.06 Example 5 46.24 0.88 1.79 0.072 0.063 Example 6 44.52 0.87 1.785 0.071 0.062 Comparative Example 1 20.14 0.31 0.52 0.02 0.01
[0087] According to Table 1, in the method for recovering valuable metals from waste provided in the embodiment of the present application, by mixing crushed biomass waste with ionic liquid and red mud, the metal oxides in the ionic liquid and red mud are used to release lignin from the biomass waste, and the lignin can be combined with the valuable metals in the red mud to form a precipitate. This can not only effectively utilize the biomass waste to reduce the recycling cost, but also recover high-value products, namely, lignocellulose precipitates adsorbed with valuable metals, and the precipitates can be further separated to obtain high-value products such as valuable metals and lignin.
[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A method for recovering valuable metals from waste materials, It is characterized in that include: A crushing step, crushing the biomass waste to obtain crushed materials, wherein the biomass waste includes lignocellulose; A decomposition step, mixing the crushed material, the ionic liquid and the waste material, and reacting them under light conditions to obtain a mixture, wherein the waste material includes red mud, and the mixture includes a precipitate adsorbed with valuable metals; The separation step is to separate the mixture to separate the precipitate adsorbed with the valuable metals from the mixture to obtain the precipitate adsorbed with the valuable metals.
2. The method according to claim 1, It is characterized in that The mass ratio of the crushed material, the ionic liquid and the red mud is (1-3): (1-2): (2-8).
3. The method according to claim 1, It is characterized in that The mass ratio of the crushed material, the ionic liquid and the red mud is (1-2):1:(5-7).
4. The method according to claim 1, It is characterized in that The mass ratio of the crushed material to the red mud is 1:(3-7).
5. The method according to claim 1, It is characterized in that The biomass waste includes at least one of straw, rice husk, stem and leaf.
6. The method according to claim 1, It is characterized in that The crushed material has a mesh size of 500-1000.
7. The method according to claim 1, It is characterized in that The ionic liquid includes a basic ionic liquid.
8. The method according to claim 7, It is characterized in that The basic ionic liquid includes one or more basic anions selected from the group consisting of hydroxide, alkoxide and alkyl carbonate, and an organic quaternary ammonium cation.
9. The method according to claim 1, It is characterized in that The reaction temperature in the decomposition step is 40°C-60°C.
10. The method according to claim 1, It is characterized in that The separation process specifically includes: The mixture is centrifuged using a cyclone to obtain a precipitate adsorbing valuable metals.