Method for removing carbon in organic silicon waste contact body and recovering silicon based on reverse flotation

Abstract

The invention belongs to but not limited to the technical field of resource recovery and solid material separation, and discloses a method for removing carbon and recovering silicon in an organic silicon waste contact body based on reverse flotation, which comprises the following steps of: mixing the organic silicon waste contact body in a flotation tank; and an oxidizing agent hydrogen peroxide, an inhibitor sodium silicate, a collecting agent kerosene and a foaming agent 2 # oil are sequentially added into a flotation tank, flotation is conducted according to a conventional process, silicon and carbon are separated, and silicon is recycled. According to the method, the collecting agent kerosene, the inhibitor sodium silicate and the oxidizing agent hydrogen peroxide are used for modifying the surfaces of silicon and carbon in the organic silicon waste contact, so that the carbon and silicon separation is achieved, and the silicon recovery rate and grade are 91.64% and 88.81% respectively. The method has the advantages that the silicon recovery rate and the treatment efficiency are improved, the treatment period is shortened, the operation is easy, the production cost is low, the energy consumption is low, and large-scale industrial production is easy.

Description

Technical Field

[0001] This invention belongs to, but is not limited to, the technical fields of solid material separation and wet separation (BOID), and particularly relates to a method for removing carbon and recovering silicon from organosilicon waste catalysts based on reverse flotation. Background Technology

[0002] Organosilicon materials are widely used in construction, electronics, electrical engineering, aerospace, and other fields due to their excellent heat resistance, electrical insulation, and chemical stability. Methylchlorosilane is the most important basic monomer for synthesizing organosilicon products. Its industrial production typically employs the direct method, which involves reacting monochloromethane with silicon powder in a fluidized bed reactor under the action of a copper-based catalyst to produce methylchlorosilane. This process is mature, has high yield, and is currently the mainstream production method in the organosilicon industry.

[0003] In the direct process of production, as the reaction time increases, carbon deposits and other sediments gradually form on the catalyst surface, leading to a decrease in catalytic activity and thus affecting the formation efficiency of methylchlorosilane. To maintain the stable operation of the reaction system, unreacted silicon powder and deactivated catalyst must be periodically removed from the reactor, resulting in solid industrial waste containing silicon, carbon, and metal components, commonly known as organosilicon waste catalyst. This type of waste catalyst typically contains 65%–75% silicon and approximately 1%–10% carbon, and its emissions account for about 7%–10% of the monomer production during organosilicon monomer production. With the continuous expansion of the organosilicon industry, the amount of waste catalyst generated is showing an increasing trend year by year.

[0004] If waste organosilicon catalysts are not effectively treated, they will not only cause potential pollution to the ecological environment but also result in a significant waste of usable resources. Therefore, research has explored methods such as roasting and chemical reactions to achieve component separation and recycling in relation to the resource utilization of waste organosilicon catalysts. For example, existing technologies use high-temperature roasting to separate silicon and carbon; however, these methods generally suffer from high energy consumption, complex processing procedures, demanding equipment requirements, and the potential generation of harmful gases during roasting, making it difficult to meet the requirements of green manufacturing and clean production.

[0005] Current research and industrial practice show that the treatment of organosilicon waste catalysts mainly focuses on the recovery of metallic copper, while less attention is paid to the efficient separation of non-metallic solid components such as silicon and carbon. Traditional treatment methods have limitations in terms of separation efficiency, economy, and environmental friendliness. In particular, during the separation of solid materials, problems such as incomplete separation, high reagent consumption, and high risk of secondary pollution are prone to occur, making it difficult to meet the needs of large-scale continuous production.

[0006] Therefore, how to achieve the effective separation and recovery of silicon and carbon in organosilicon waste catalysts without relying on high-temperature roasting or complex chemical reactions, using more efficient, low-energy-consumption, and environmentally friendly solid material separation methods, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] To address the problems existing in the prior art, this invention provides a novel method for efficiently separating silicon and carbon from organosilicon waste catalysts via reverse flotation. This method aims to solve the problems of low silicon and carbon separation efficiency, high cost, and environmental pollution associated with existing organosilicon waste catalysts, thereby achieving efficient recycling of silicon and carbon.

[0008] This invention is implemented as follows: a method for removing carbon and recovering silicon from organosilicon waste catalysts based on reverse flotation, comprising the following steps:

[0009] S101, take the leaching residue of organosilicon waste catalyst, and adjust the slurry in the flotation cell for 3 minutes; the solids concentration of the slurry is about 20%.

[0010] S102, add hydrogen peroxide, an oxidant, to the slurry obtained in S101, and adjust the slurry for 4 minutes;

[0011] S103, add sodium silicate inhibitor to the slurry obtained in S102, and adjust the slurry for 4 minutes;

[0012] S104, add kerosene as a collector to the slurry obtained in S104, and adjust the slurry for 4 minutes;

[0013] S105, add foaming agent #2 oil to the slurry obtained in S103, and adjust the slurry for 4 minutes;

[0014] S106. The slurry obtained from S105 is subjected to flotation according to conventional processes to separate silicon and carbon, resulting in floating carbon and deposited silicon.

[0015] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0016] This invention provides a novel method for separating silicon and carbon from waste organosilicon catalysts via reverse flotation. The method utilizes kerosene as a collector, sodium silicate as an inhibitor, and hydrogen peroxide as an oxidant to modify the surfaces of silicon and carbon in the waste organosilicon catalysts, thereby achieving carbon-silicon separation. The silicon recovery rate and grade are 91.64% and 88.81%, respectively. This invention features high recovery indicators, a simple process, ease of operation, low production costs, and is environmentally friendly and energy-saving.

[0017] Both elemental silicon and carbon exhibit natural floating behavior. Silicon is chemically relatively reactive; hydrogen peroxide, as an oxidizing agent, readily reacts with silicon, adsorbing onto the silicon surface to form oxidation products, further promoting adsorption. Carbon is chemically relatively stable; under normal temperature and pressure, the oxidation reaction between hydrogen peroxide and carbon is relatively difficult to occur. Therefore, the effect of promoting adsorption through oxidation is not significant. The addition of an oxidizing agent further promotes the adsorption of sodium silicate onto the silicon surface. Carbon particles often have a certain degree of hydrophobicity, which matches the hydrophobicity of kerosene, allowing kerosene to spread and adhere better to the carbon particle surface. Oxidized silicon surfaces, however, are hydrophilic because silicon atoms readily combine with oxygen to form silanol groups (Si-OH). This hydrophilicity makes kerosene adhesion to the silicon surface relatively difficult, thus affecting the kerosene's collection effect on silicon. By using inhibitors and collectors, a good separation effect between silicon and carbon can be achieved.

[0018] (1) The expected benefits and commercial value of the technical solution of this invention after transformation are as follows:

[0019] The method of this invention directly separates silicon and carbon from waste organosilicon catalysts. Compared with the ignition method for silicon and carbon separation, this invention has advantages such as improved silicon recovery rate and processing efficiency, shorter processing cycle, easier operation, lower energy consumption, environmental friendliness, and ease of large-scale industrial production. It improves the recycling and utilization of waste organosilicon catalyst resources, bringing greater economic benefits to enterprises.

[0020] (2) The technical solution of this invention fills a technical gap in the industry both domestically and internationally:

[0021] Currently, flotation has not been used as a method for separating and recovering silicon and carbon from organosilicon waste catalysts in secondary resource recycling. Based on the surface characteristics of silicon and carbon, this invention proposes a combined action of hydrogen peroxide and sodium silicate to achieve better silicon suppression while leaving the surface properties of carbon particles almost unaffected and maintaining good floatability. When kerosene is used as a collector, excellent collection results are achieved, thus achieving better silicon-carbon separation and silicon recovery.

[0022] The significant technological advancements brought about by the method for separating silicon and carbon and recovering silicon from organosilicon waste catalysts through reverse flotation provided by this invention include:

[0023] 1) Improve silicon recovery efficiency: The reverse flotation separation method can more effectively separate silicon and carbon from organosilicon waste. Compared with traditional methods, it significantly improves silicon recovery efficiency, which is of great significance for environmental protection and resource reuse.

[0024] 2) Reduced environmental impact: This method uses environmentally friendly chemical additives, reducing the use of harmful chemicals. Compared with the traditional pyrometallurgical separation of carbon and silicon in organosilicon waste, the flotation method greatly reduces the negative impact on the environment.

[0025] 3) Cost-effectiveness: The flotation method promotes better separation of silicon and carbon, and improves the silicon recovery rate. This method can reduce the waste of raw materials, thereby reducing production costs and has high economic benefits for organosilicon production enterprises.

[0026] 4) Easy to operate: This process is simple to operate and easy to control, making it very suitable for large-scale industrial applications and helping to improve production efficiency.

[0027] 5) Improve product quality: Through precise flotation technology, carbon and silicon can be separated, while the purity of recovered silicon can be improved, ultimately improving product quality.

[0028] 6) Save energy and resources: The flotation method does not require high temperature and large equipment, which effectively reduces energy consumption and raw material waste and helps to achieve sustainable production.

[0029] 7) Technological Innovation: This method demonstrates a new technical approach in the field of organosilicon waste catalyst treatment, and provides new ideas and methods for the separation and utilization of similar materials.

[0030] This method achieves efficient separation and recovery of silicon and carbon from organosilicon waste catalysts through the rational setting of various process parameters in reverse flotation. Controlling the slurry solids concentration at approximately 20% facilitates the full dispersion of mineral particles in the flotation cell, enhances the contact efficiency between the reagents and the particle surface, and creates stable conditions for selective flotation. Hydrogen peroxide, as an oxidant, effectively alters the chemical activity of the carbonaceous surface, increasing its hydrophobicity difference and providing a favorable basis for subsequent collection. The addition of sodium silicate effectively inhibits the silicon phase, reducing the possibility of silicon entering the foam layer, thereby improving the selectivity of carbon flotation. Kerosene, as a collector, is used in a dosage matched to the slurry conditioning time, which is conducive to the stable formation of a hydrophobic layer on the carbon particle surface. The stable foaming properties of oil allow for the formation of a uniform and fine foam structure, enhancing the carbon's flotation ability. Through the synergistic effect of these parameters, the silicon and carbon separation process becomes stable and controllable, improving recovery rate and product purity, and possessing significant industrial application value.

[0031] The method for recovering silicon from crystalline silicon cutting waste slurry by flotation provided by this invention has brought significant technological progress in terms of improving silicon recovery efficiency, reducing environmental impact, cost-effectiveness, ease of operation, improving product quality, saving energy and resources, and technological innovation. Attached Figure Description

[0032] Figure 1 This is a flowchart of a method for efficiently recovering silicon from organosilicon waste catalysts via reverse flotation, provided in an embodiment of the present invention.

[0033] Figure 2This is a schematic diagram of the process for efficiently recovering silicon from organosilicon waste catalysts via reverse flotation, as provided in an embodiment of the present invention.

[0034] Figure 3 The present invention provides an embodiment that, under the condition that the dosage of inhibitor (sodium silicate) is 1 kg / t, the dosage of collector (kerosene) is 0.4 kg / t, and the dosage of frother (2# oil) is 0.04 kg / t, the effect of the dosage of oxidant (hydrogen peroxide) on the efficiency and grade of flotation recovery of silicon is investigated.

[0035] Figure 4 This embodiment of the invention investigates the effect of the dosage of inhibitor (sodium silicate) on the efficiency and grade of silicon recovery by flotation under the conditions that the dosage of oxidant (peroxide) is 1.5 kg / t, the dosage of collector (kerosene) is 0.4 kg / t, and the dosage of frother (2# oil) is 0.04 kg / t.

[0036] Figure 5 This is a diagram illustrating the effect of silicon-carbon separation achieved by sequentially adding the corresponding reagents and performing a reverse flotation process, as provided in an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] like Figure 1 As shown, this embodiment of the invention provides a method for efficiently recovering silicon from organosilicon waste catalysts via reverse flotation. The organosilicon waste catalysts are prepared in a flotation cell; hydrogen peroxide (oxidant), sodium silicate (inhibitor), kerosene (collector), and frother (foaming agent #2 oil) are added sequentially to the flotation cell, and flotation is performed according to conventional processes to separate silicon and carbon and recover silicon; specifically, the following steps are included:

[0039] S101, take the leaching residue of organosilicon waste catalyst, and adjust the slurry in the flotation cell for 3 minutes; the solids concentration of the slurry is about 20%.

[0040] S102, add hydrogen peroxide, an oxidant, to the slurry obtained in S101, and adjust the slurry for 4 minutes;

[0041] S103, add sodium silicate inhibitor to the slurry obtained in S102, and adjust the slurry for 4 minutes;

[0042] S104, add kerosene as a collector to the slurry obtained in S104, and adjust the slurry for 4 minutes;

[0043] S105, add foaming agent #2 oil to the slurry obtained in S103, and adjust the slurry for 4 minutes;

[0044] S106. The slurry obtained from S105 is subjected to flotation according to conventional processes to separate silicon and carbon, resulting in floating carbon and deposited silicon.

[0045] The method for recovering silicon from organosilicon waste catalysts provided in this invention is based on the differences in surface physicochemical properties between silicon and carbon. Utilizing the principle of reverse flotation, it achieves effective separation of silicon and carbon in an aqueous medium through reagent control. After pretreatment, the organosilicon waste catalysts form a mixed solid system containing silicon and carbon particles. During flotation, the surface wettability and hydrophobicity of different component particles undergo differentiated changes under the synergistic effects of various reagents, including oxidation, inhibition, collection, and foaming, thereby achieving selective separation.

[0046] During the slurry preparation stage, the waste organosilicon catalyst is thoroughly mixed with water to ensure that the solid particles are uniformly dispersed in the slurry, forming a stable suspension system. This provides conditions for sufficient contact between the subsequent reagents and the particle surface. Hydrogen peroxide is then added as an oxidant, and the particle surface is oxidized under stirring conditions. This process alters the surface state of carbon and its surface deposits in the waste catalyst, increasing its surface activity and improving the difference in surface properties between silicon particles and impurities, thus laying the foundation for selective separation.

[0047] After the addition of sodium silicate, the inhibitor preferentially adsorbs onto the surface of silicon particles, forming a hydrophilic protective layer. This significantly reduces the interaction between the silicon particles and the collector, inhibiting the upward movement of the silicon particles. Simultaneously, the presence of sodium silicate helps stabilize the slurry system, reduces non-selective entrainment of fine silicon particles, and improves the selectivity of the separation process.

[0048] Subsequently, kerosene, a collector, is added. As a non-polar collector, kerosene preferentially adsorbs onto the surface of the oxidized carbon particles, enhancing their hydrophobicity. Under the action of frother #2 oil, a stable and uniform bubble system is formed in the flotation cell. The hydrophobic carbon particles easily adhere to the bubble surface and float with the bubbles, while the silicon particles, inhibited by sodium silicate, remain hydrophilic and cannot adhere to the bubbles, eventually settling at the bottom of the cell.

[0049] Through the synergistic effect of the aforementioned reagents and the control of the flotation process, reverse flotation separation of silicon and carbon in organosilicon waste catalysts was achieved. Carbon floats to the surface with the foam and is discharged, while silicon is recovered as sediment. This separation process does not rely on high-temperature roasting or complex chemical reactions; it is a typical wet solid material separation mechanism with high separation efficiency, low energy consumption, and a relatively simple process, making it suitable for the efficient recovery of silicon resources from organosilicon waste catalysts.

[0050] like Figure 2As shown, the amount of hydrogen peroxide added as the oxidant is 1.5 kg / t; the amount of sodium silicate added as the inhibitor is 2 kg / t; the amount of kerosene added as the collector is 0.4 kg / t; and the amount of No. 2 oil added as the foaming agent is 0.04 kg / t.

[0051] This invention directly applies reverse flotation to the copper-removed organosilicon waste catalyst, using kerosene as the collector. Kerosene selectively adsorbs onto the surface of carbon particles, enhancing their hydrophobicity. Oil #2 is used as a foaming agent to generate stable foam, allowing carbon particles to adhere to it. Hydrogen peroxide is used as an oxidant; after adsorption onto the silicon surface, it further oxidizes some low-valence silicon oxides, altering the surface's chemical state and potentially forming more polar groups such as silanol groups (Si-OH). This change in surface properties enhances the interaction between the silicon surface and inhibitor molecules, making it easier for the inhibitor to adsorb onto the silicon surface, thus improving adsorption efficiency and stability, and enhancing its inhibitory effect. Sodium silicate is used as an inhibitor. Sodium silicate hydrolyzes on the silicon surface to generate silicic acid, which further polymerizes to form a protective silicic acid gel film. This film isolates the silicon from the external environment, preventing reactions with other substances and thus inhibiting silicon growth. After aeration, carbon is carried out by foam, while silicon settles to the bottom of the flotation tank, thus achieving the separation of silicon and carbon in organosilicon waste catalyst.

[0052] This invention utilizes hydrogen peroxide as an oxidant to further oxidize some low-valence silicon oxides on the silicon surface, altering its chemical state and potentially forming more polar groups such as silanol groups (Si-OH). This change in surface properties enhances the interaction between the silicon surface and inhibitor molecules, making it easier for the inhibitor to adsorb onto the silicon surface, thereby improving the adsorption efficiency and stability of the inhibitor and enhancing its inhibitory effect. Since carbon particle surfaces often possess a certain degree of hydrophobicity, which matches the hydrophobicity of kerosene, using kerosene as a collector allows it to spread and adhere more effectively on the carbon particle surface, making it easier to adsorb onto the carbon surface. Under the action of the inhibitor, silicon is less easily adsorbed by kerosene. This method offers advantages such as improved silicon recovery rate and processing efficiency, shorter processing cycle, ease of operation, low production cost, low energy consumption, environmental friendliness, and ease of large-scale industrial production.

[0053] Application Example 1: Recycling of Waste Silicone Catalysts from an Organosilicon Material Production Plant

[0054] 1) Waste collection: Collect the leaching residue after acid leaching of organosilicon waste catalyst.

[0055] 2) Preliminary treatment: The collected organosilicon waste catalyst leaching residue is dried, and the clumps are ground into powder using a mortar and pestle and then collected.

[0056] 3) Addition of flotation reagents: Add oxidant, inhibitor, collector and frother to the slurry in sequence, including 1.5 kg / t of hydrogen peroxide, 2 kg / t of sodium silicate, 0.4 kg / t of kerosene and 0.04 kg / t of No. 2 oil.

[0057] 4) Slurry preparation and flotation: The slurry preparation and flotation process is carried out in the flotation cell to separate silicon and carbon. Carbon floats to the surface and is collected, while silicon is deposited and collected.

[0058] Application Example 2: Silicon Recovery from Waste Catalyst Treatment Center in Organosilicon Monomer Synthesis Industry

[0059] 1) Waste Receiving: Receiving waste silicone catalysts from different silicone monomer manufacturers.

[0060] 2) Slurry preparation: Dry, grind and collect the waste organosilicon catalyst.

[0061] 3) Chemical additives: Oxidizing agent, inhibitor, collector and foaming agent are added to the slurry in sequence, including 1.5 kg / t of hydrogen peroxide, 2 kg / t of sodium silicate, 0.4 kg / t of kerosene and 0.04 kg / t of No. 2 oil.

[0062] 4) Flotation process: The flotation process in which flotation reagents are added sequentially into the flotation cell and the process is precisely controlled.

[0063] 5) Silicon recovery: Silicon is deposited at the bottom of the flotation cell, filtered, dried and recovered. After necessary purification, the pure silicon is sent to organosilicon monomer manufacturers or sold to other companies that need silicon materials.

[0064] In these two embodiments, the method makes full use of the waste catalyst generated during the synthesis of organosilicon monomers. Through effective flotation technology, it achieves the separation of silicon and carbon and the recovery of silicon, reducing environmental pollution, lowering energy consumption, and improving the reuse rate of resources.

[0065] Example 1

[0066] In this embodiment, copper-free treated organosilicon waste catalyst is used as raw material. It is added to a flotation cell and tap water is added for wet slurry preparation, so that the solid material is evenly dispersed in the aqueous medium to form a stable slurry. Subsequently, an oxidant, inhibitor, collector, and frother are added to the slurry in sequence. After each agent is added, the slurry is stirred and prepared to ensure that the agents fully contact the silicon and carbon components in the slurry and cause surface interaction.

[0067] After slurry conditioning, the slurry is subjected to flotation treatment using a reverse flotation process. During flotation, the carbon component floats to the surface with the bubbles under the action of collectors and frothers, forming a foam layer that is discharged. Meanwhile, the silicon component remains hydrophilic under the action of inhibitors, does not adhere to the bubbles, and settles at the bottom of the flotation cell, thus achieving the separation and recovery of silicon and carbon from organosilicon waste.

[0068] Example 2

[0069] In this embodiment, the copper-free organosilicon waste catalyst is subjected to wet slurry conditioning. During the slurry conditioning process, the amount of water added is adjusted to maintain the solids concentration of the slurry at approximately 20% to ensure good fluidity and dispersibility. After slurry conditioning, oxidation control, inhibition control, and collection control steps are implemented sequentially, using different agents to differentiate the surface properties of the silicon and carbon components.

[0070] Subsequently, the slurry, after being regulated, undergoes reverse flotation. Under flotation conditions, the difference in wettability between the silicon and carbon components is further amplified. The carbon component preferentially enters the froth layer and is discharged, while the silicon component remains at the bottom of the flotation cell as sediment. This embodiment, through the implementation of the overall process configuration, verifies the feasibility of the technical solution of reverse flotation separation based on wettability differences in practical operation.

[0071] Example 3

[0072] This embodiment employs reverse flotation control logic to separate silicon and carbon in organosilicon waste catalyst. After the slurry conditioning stage, the carbon components in the slurry are first oxidized to improve their surface activity, making them more readily react with the collector during subsequent collection. This oxidation process is carried out under stirring conditions to ensure that the oxidant acts uniformly on the surface of the carbon components.

[0073] After oxidation, the synergistic effect of inhibitors and collectors suppresses the flotation of silicon components while enhancing the flotation of carbon components. Subsequent flotation operations result in the carbon components being discharged with the foam layer, while the silicon components are deposited at the bottom of the tank, achieving separation and recovery. This embodiment illustrates a reverse flotation control method that "suppresses silicon and enhances carbon."

[0074] Example 4

[0075] In this embodiment, the copper-free organosilicon waste catalyst is added to the flotation cell for slurry preparation in a conventional manner, and oxidation, inhibition, collection, and foaming treatments are performed sequentially. Each step is carried out under stirring conditions to ensure that the reagents fully act on the solid particles in the slurry. The entire process is a wet operation and does not involve high temperatures or complex chemical reactions.

[0076] In the final flotation stage, silicon and carbon are separated by reverse flotation. Carbon is enriched in the flotation foam layer, while silicon is enriched at the bottom of the flotation cell, thus completing the recovery of silicon resources from the organosilicon waste. This embodiment verifies the feasibility of the method of the present invention in continuous steps from the perspective of the overall process.

[0077] like Figure 3 As shown, under the conditions that the dosage of inhibitor (sodium silicate) is 1 kg / t, the dosage of frother (2# oil) is 8 μl, and the dosage of collector (kerosene) is 80 μl, the effect of the dosage of oxidant (hydrogen peroxide) on the efficiency and grade of silicon recovery by flotation was investigated.

[0078] like Figure 4 As shown, under the condition that the dosage of oxidant (peroxide) is 1.5 kg / t, the dosage of collector (kerosene) is 0.4 kg / t, and the dosage of frother (2# oil) is 0.04 kg / t, the effect of the dosage of inhibitor (sodium silicate) on the efficiency and grade of silicon recovery by flotation was investigated.

[0079] Figure 5 This diagram illustrates the effect of silicon-carbon separation achieved by adding the appropriate reagents sequentially and using a reverse flotation process.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for removing carbon and recovering silicon from organosilicon waste catalysts based on reverse flotation, characterized in that, Includes the following steps: S101, take the leaching residue of organosilicon waste catalyst, and adjust the slurry in the flotation cell for 3 minutes; the solids concentration of the slurry is about 20%. S102, add hydrogen peroxide, an oxidant, to the slurry obtained in S101, and adjust the slurry for 4 minutes; S103, add sodium silicate inhibitor to the slurry obtained in S102, and adjust the slurry for 4 minutes; S104, add kerosene as a collector to the slurry obtained in S104, and adjust the slurry for 4 minutes; S105, add foaming agent #2 oil to the slurry obtained in S103, and adjust the slurry for 4 minutes; S106. The slurry obtained from S105 is subjected to flotation according to conventional processes to separate silicon and carbon, resulting in floating carbon and deposited silicon.

2. The method as described in claim 1, characterized in that, The oxidant is used to oxidize and modify the surface of the carbon components in the waste catalyst to enhance their interaction with the collector.

3. The method as described in claim 1, characterized in that, The inhibitor is selectively adsorbed onto the surface of the silicon component, keeping the silicon component in a hydrophilic state during the flotation process.

4. The method as described in claim 1, characterized in that, The collector preferentially acts on the carbon component, causing the carbon component to adhere to the air bubble and float to the surface under the action of the foaming agent.

5. A method for separating and recovering silicon and carbon from organosilicon waste catalyst according to any one of claims 1-4, characterized in that, include: The copper-free organic silicon waste catalyst was subjected to wet slurry preparation; The surface wettability difference between silicon and carbon components in aqueous media was altered through oxidation regulation, inhibition regulation, and capture regulation. Reverse flotation separation is performed based on the aforementioned wettability difference to achieve selective separation of silicon and carbon.

6. The method as described in claim 5, characterized in that, The solids concentration of the slurry during the wet slurry preparation process is 20%.

7. The method as described in claim 5, characterized in that, The oxidation regulation, inhibition regulation, and harvesting regulation are carried out in the order of oxidant, inhibitor, and harvester.

8. A reverse flotation method for separating silicon and carbon in organosilicon waste catalyst, implementing the method for removing carbon and recovering silicon from organosilicon waste catalyst based on reverse flotation as described in any one of claims 1-4, characterized in that, By suppressing the flotation of silicon components and enhancing the flotation of carbon components, silicon components are recovered in the form of sedimentation during the flotation process.

9. The method as described in claim 8, characterized in that, By oxidizing the surface of the carbon component before flotation, the responsiveness of the carbon component to the collector is improved.

10. The method as described in claim 8, characterized in that, The foam layer formed during the flotation process is used to carry the carbon components out, while the bottom of the flotation cell is used to collect the silicon components.

Images