Environmentally friendly method for regenerating waste refined clay

Abstract

The present invention belongs to the technical field of clay regeneration, and specifically relates to an environmentally friendly method for regenerating refined waste clay. The environmentally friendly method for regenerating refined waste clay comprises the following steps: A. extracting the refined waste clay using a dual solvent through a leaching device to extract oil and pigment, and recovering the dual solvent; B. subjecting the refined waste clay treated in step A to an acid treatment activation reaction, performing solid-liquid separation after the reaction is complete, collecting the solid to obtain acidic waste clay, and recovering the liquid for reuse in the acid treatment activation reaction; C. dissolving the solid sodium hydroxide with water, adjusting the pH of the acidic waste clay, and then drying it to obtain regenerated activated waste clay; leaching using an improved leacher, no wastewater is generated during the treatment process, and both the solvent and acid treatment liquid used can be recycled.

Description

Technical Field

[0001] The invention belongs to the technical field of clay regeneration, and in particular relates to an environmentally friendly method for regenerating refined waste clay. Background Art

[0002] Activated clay has excellent pigment adsorption properties and is widely used in the field of oil refining and decolorization. The surface pores of the waste clay produced after use are blocked by oil, pigments and impurities, and it loses its adsorption and decolorization capabilities. The large amount of waste clay produced in the process of oil refining and decolorization is hazardous to store and difficult to handle. Usually, the waste clay is squeezed out by high-pressure pressing to make bricks, build roads or burn, but clay is a limited mineral resource. Long-term use of this method will cause a shortage of clay resources. In recent years, as people's environmental protection awareness has gradually deepened, more and more people have begun to pay attention to the problem of waste clay regeneration. However, it is impossible to take into account the cost and regeneration effect of regeneration. At the same time, secondary pollution will be generated during the regeneration process. In the existing technology, a lot of wastewater will be generated during the regeneration of waste clay, resulting in serious waste of resources, and the extraction process is subject to the extraction equipment, with low extraction efficiency and poor effect.

[0003] CN103182299B provides a method for regenerating waste clay, comprising: treating the waste clay with a solvent containing at least two polar compounds: a protonic acid that provides hydrogen ions, and a polar solvent with a polarity of 3-8 and a boiling point of 45-85°C; leaching using either continuous or intermittent leaching; continuous leaching for 0.5-8 hours; intermittent leaching for 0.5-4 hours, and a material-to-liquid ratio of 1-6:1 (mL / g); and oil recovery after solvent leaching. This method uses both acid and solvent to leach the waste clay, and has only been applied in the laboratory stage. The most critical leaching step of this process has not been resolved, and the problems faced in industrial production have not been solved.

[0004] Therefore, it is urgent to regenerate the waste white clay from harmless refining, reduce the regeneration cost, improve the regeneration effect, and achieve the reuse of white clay resources. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide an environmentally friendly method for regenerating refined waste clay, in which no wastewater is generated during the treatment process, and the solvent and acid treatment liquid used can be recycled.

[0006] The environmentally friendly method for regenerating refined waste clay of the present invention comprises the following steps:

[0007] A. Use a double solvent to extract the refined waste clay through a leaching device to extract oil and pigment, and recover the double solvent;

[0008] B. treating the refined waste clay treated in step A with acid for activation reaction, performing solid-liquid separation after the reaction is completed, collecting the solid to obtain the acidic waste clay, and recovering the liquid to be used again in the acid treatment activation reaction process;

[0009] C. Dissolve the solid sodium hydroxide with water to adjust the pH of the acidic waste clay, and then dry it to obtain the regenerated activated waste clay;

[0010] Dissolve sodium hydroxide in a small amount of water and add it to the acidic waste clay containing a small amount of solvent. Mix well and test its pH. Try to avoid adding too much water, which will increase energy consumption in the later drying process. A 30-34 wt.% sodium hydroxide solution is preferred.

[0011] The acid treatment activation reaction process in step B is as follows: adding 2-3 wt.% sulfuric acid solution to the refined waste clay treated in step A and heating the mixture for reaction.

[0012] Preferably, the dual solvent in step A is petroleum ether and methanol.

[0013] Further preferably, the mass ratio of petroleum ether to methanol is 1:(1-1.5).

[0014] Preferably, the temperature of the acid treatment activation reaction in step B is 90-100° C., and the reaction time is 1-2 h.

[0015] The pH in step C is 6-7.

[0016] The leaching device includes an extractor, a liquid distribution plate is provided at the bottom of the extractor, an oil collecting hopper is provided at the bottom of the extractor which is larger than the diameter of the extractor, an aggregate grid is provided inside the extractor, and there is an aggregate grid inside the extractor with no liquid distribution plate at the bottom, the liquid distribution plate is fixedly connected to the oil collecting hopper, an oil collecting grid is provided in the oil collecting hopper corresponding to the aggregate grid, the oil collecting grid is separated by a partition plate inside the oil collecting hopper, the position where the liquid distribution plate is not provided is directly opposite to the discharge grid, an anti-clogging spray mechanism is provided below the liquid distribution plate at the bottom of the extractor corresponding to the aggregate grid, a liquid extraction pipe is provided on the side wall of the oil collecting hopper corresponding to the oil collecting grid, and the liquid extraction pipe is connected to a circulation pump.

[0017] The height of the partition plates gradually decreases on the side close to the discharge grid, reaching the lowest height on the other side close to the discharge grid. The upper portion of the oil collecting grid with a higher partition plate is provided on one side of the discharge grid, and a high-density solvent feeding pipeline and a low-density solvent feeding pipeline are provided at the corresponding position of the collecting grid. The upper portion of the oil collecting grid with a lower partition plate is provided on the other side of the discharge grid, and a stirring device is provided at the corresponding position of the collecting grid. The bottom of the oil collecting grid with a lower partition plate on the other side of the discharge grid is connected to the solvent extraction pipeline.

[0018] The anti-clogging liquid spray mechanism includes a plurality of liquid spray holes arranged on a liquid distribution plate, a liquid spray trough is fixedly arranged below the liquid distribution plate along the setting direction of the liquid spray holes, the liquid spray trough wraps the liquid spray holes inside the liquid spray trough, a circulation pump is connected to one end of the liquid spray trough close to the outer edge of the liquid distribution plate through a liquid inlet pipe, and the bottom of the other end of the liquid spray trough is connected to the liquid extraction pipe through a circulation pipe; the end of the liquid spray trough close to the inside of the liquid distribution plate is provided with a buffer zone at a distance from the liquid spray hole closest to the inside of the liquid distribution plate, and the bottom of the buffer zone of the liquid spray trough is connected to the liquid extraction pipe through a circulation pipe; the setting direction of the liquid spray trough is consistent with that of the liquid inlet pipe, and the setting direction of the liquid spray holes on the liquid distribution plate is consistent with that of the liquid inlet pipe.

[0019] A gravity sedimentation chamber is vertically arranged downward on the circulation pipeline, and a discharge valve is arranged at the bottom of the gravity sedimentation chamber.

[0020] A regulating valve is provided on the liquid inlet pipeline.

[0021] The specific extraction process of step A is as follows: methanol and the refined waste clay to be extracted are respectively added through the high-density solvent feeding pipeline and stirred to fill all the aggregate grids in the extractor, and then the double solvents are added to the aggregate grid in proportion through the high-density solvent feeding pipeline and the low-density solvent feeding pipeline. The double solvents overflow from the top of the aggregate grid and flow into the oil collecting grid below. After passing through the liquid extraction pipe, the circulation pump, and the liquid inlet pipe, they are again pumped into the upper aggregate grid. The extraction is repeated, and each oil collecting grid is pumped through the liquid extraction pipe, the circulation pump, and the liquid inlet pipe. , the liquid inlet pipeline repeatedly extracts the material above. As the height of the partition plates on both sides of each oil collecting grid decreases successively, the dual solvent in the oil collecting grid will overflow to the next oil collecting grid after being filled. The rotation direction of the upper extractor aggregate grid is opposite to the overflow direction of the dual solvent in the lower oil collecting grid. The extractor aggregate grid rotates to the corresponding position of the discharge grid, and all materials fall down to complete the extraction of the refined waste white clay in the aggregate grid. The dual solvent is extracted from the bottom of the oil collecting grid at the overflow end point through the solvent extraction pipeline to the distillation device to recover the dual solvent.

[0022] The rotation speed of the extractor during the extraction process is 45-60 minutes per revolution.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The environmentally friendly regeneration method of the refined waste clay of the present invention does not use water to wash the treated waste clay, does not generate industrial wastewater, and the dilute sulfuric acid solution used for acid treatment can be reused.

[0025] (2) The environmentally friendly regeneration method of refined waste clay described in the present invention uses a small amount of water to dissolve sodium hydroxide, and then adds it to the acidic waste clay containing a small amount of solvent, mixes it evenly, and tests its pH. It is best to avoid adding too much water, which will cause more energy consumption in the later drying process, and is energy-saving and environmentally friendly.

[0026] (3) The environmentally friendly regeneration method of the refined waste clay described in the present invention uses sodium hydroxide to adjust the pH value. Sodium sulfate salt exists in the waste clay. The regeneration method described in the present invention does not require water washing, and the sodium sulfate salt remains in the regenerated waste clay. Because the sodium sulfate salt itself has a certain catalytic adsorption effect, it will not only not have a negative impact on the performance of the waste clay, but will also play a positive role. The lack of water washing saves water resources and does not generate industrial wastewater, which is energy-saving and environmentally friendly.

[0027] (4) The environmentally friendly regeneration method of refined waste clay described in the present invention uses a leaching device that uses a high-density solvent to fill the aggregate grid, and then replenishes the dual solvent according to a set ratio. The replenishment amount and ratio are the overflow amount and ratio. The dual solvent overflowing from the aggregate grid falls into the oil collection grid and overflows in one direction through the partition plate with a gradually decreasing height. The rotation direction of the extractor aggregate grid is opposite to the solvent overflow direction, thereby realizing the use of saturated solvent to leaching the waste clay that has just been fed in, and the use of unsaturated solvent to finally leaching the waste clay that is about to complete the leaching step. The countercurrent leaching is high in efficiency and good in effect.

[0028] (5) The leaching device used in the present invention repeatedly injects solvent from the bottom of the aggregate grid and overflows from the top, thereby improving the leaching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the leaching device of the present invention;

[0030] Figure 2 A bottom view of the anti-clogging liquid spraying mechanism of the present invention;

[0031] Figure 3 A top view of the anti-clogging spray mechanism of the present invention;

[0032] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of A in the middle;

[0033] Figure 5 This is a schematic diagram of the front three-dimensional structure of the oil collecting hopper;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the back of the oil collecting hopper;

[0035] Figure 7 This is a bottom view of the liquid distribution plate;

[0036] In the figure: 1. Extractor; 2. Aggregate grid; 3. Liquid distribution plate; 4. Anti-clogging spray mechanism; 401. Spray tank; 402. Spray hole; 403. Liquid inlet pipe; 404. Circulation pipe; 5. Oil collecting hopper; 501. Oil collecting grid; 502. Dividing plate; 503. Discharge grid; 504. Solvent extraction pipeline; 6. Liquid extraction pipe; 7. Circulation pump; 8. Gravity settling chamber; 9. Discharge valve; 10. Regulating valve; 11. Stirring; 12. High-density solvent feeding pipeline; 13. Low-density solvent feeding pipeline. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the following examples, but the protection scope of the present invention is not limited thereto.

[0038] Unless otherwise specified, all raw materials used in the examples are commercially available.

[0039] The embodiments of the present invention use the following apparatus and method for leaching.

[0040] like Figure 1-7 As shown, the leaching device includes an extractor 1, a liquid distribution plate 3 is provided at the bottom of the extractor 1, an oil collecting hopper 5 is provided at the bottom of the extractor 1 which is larger than the diameter of the extractor 1, an aggregate grid 2 is provided inside the extractor 1, and there is an aggregate grid 2 inside the extractor 1 without a liquid distribution plate 3 at the bottom. The liquid distribution plate 3 is fixedly connected to the oil collecting hopper 5, and an oil collecting grid 501 is provided in the oil collecting hopper 5 corresponding to the aggregate grid 2. The oil collecting grid 501 is separated by a partition plate 502 inside the oil collecting hopper 5, and the position where the liquid distribution plate 3 is not provided is opposite to the discharge grid 503. An anti-clogging spray mechanism 4 is provided below the liquid distribution plate 3 at the bottom of the extractor 1 corresponding to the aggregate grid 2, and a liquid extraction pipe 6 is provided on the side wall of the oil collecting hopper 5 corresponding to the oil collecting grid 501, and the liquid extraction pipe 6 is connected to a circulation pump 7.

[0041] The height of the partition plate 502 gradually decreases on the side close to the discharge grid 503, and is lowest on the other side close to the discharge grid 503; the upper part of the oil collecting grid 501 with a higher partition plate 502 is provided on one side of the discharge grid 503, and a high-density solvent feeding pipeline 12 and a low-density solvent feeding pipeline 13 are provided at the position corresponding to the aggregate grid 2; the upper part of the oil collecting grid 501 with a lower partition plate 502 is provided on the other side of the discharge grid 503, and a stirring 11 is provided at the position corresponding to the aggregate grid 2; the bottom of the oil collecting grid 501 with a lower partition plate 502 is connected to the solvent extraction pipeline 504.

[0042] The anti-clogging liquid spray mechanism 4 includes a plurality of liquid spray holes 402 arranged on the liquid distribution plate 3, and a liquid spray groove 401 is fixedly arranged below the liquid distribution plate 3 along the setting direction of the liquid spray hole 402, and the liquid spray groove 401 wraps the liquid spray hole 402 inside the liquid spray groove 401, and the circulation pump 7 is connected to the end of the liquid spray groove 401 close to the outer edge of the liquid distribution plate 3 through the liquid inlet pipe 403, and the bottom of the other end of the liquid spray groove 401 is connected to the liquid extraction pipe 6 through the circulation pipe 404; the end of the liquid spray groove 401 close to the inside of the liquid distribution plate 3 is provided with a buffer zone at a distance from the liquid spray hole 402 closest to the inside of the liquid distribution plate 3, and the bottom of the buffer zone of the liquid spray groove 401 is connected to the liquid extraction pipe 6 through the circulation pipe 404; the setting direction of the liquid spray groove 401 is consistent with that of the liquid inlet pipe 403, and the setting direction of the liquid spray hole 402 on the liquid distribution plate 3 is consistent with that of the liquid inlet pipe 403.

[0043] A gravity settling chamber 8 is vertically provided on the circulation pipe 404 , and a discharge valve 9 is provided at the bottom of the gravity settling chamber 8 .

[0044] The liquid inlet pipe 403 is provided with a regulating valve 10 .

[0045] The specific extraction process of step A is as follows: methanol and the refined waste clay to be extracted are respectively fed through the high-density solvent feeding pipeline 12 and the stirring 11 to fill all the aggregate grids 2 in the extractor 1, and then the dual solvents methanol and petroleum ether are added to the aggregate grid 2 in proportion through the high-density solvent feeding pipeline 12 and the low-density solvent feeding pipeline 13. The feeding rate of petroleum ether is 10 kg / s, and the feeding rate of methanol is adjusted by multiples relative to the feeding rate of petroleum ether according to the mass ratio of the amount used. The dual solvents overflow from the top of the aggregate grid 2 and flow into the oil collecting grid 501 below, and are pumped into the upper aggregate grid 2 again through the liquid extraction pipe 6, the circulation pump 7, and the liquid inlet pipe 403, and repeated. Extraction: Each oil collecting grid 501 repeatedly extracts the material above through the liquid extraction pipe 6, the circulation pump 7, and the liquid inlet pipe 403. Since the height of the partition plates 502 on both sides of each oil collecting grid 501 decreases successively, the dual solvent in the oil collecting grid 501 will overflow to the next oil collecting grid 501 after it is filled. The rotation direction of the upper extractor 1 collecting grid 2 is opposite to the overflow direction of the dual solvent in the lower oil collecting grid 501. The extractor 1 collecting grid 2 rotates to the corresponding position of the discharge grid 503, and all the materials fall, completing the extraction of the refined waste white clay in the collecting grid 2. The dual solvent is extracted from the bottom of the oil collecting grid 501 at the overflow end point through the solvent extraction pipeline 504 to the distillation device to recover the dual solvent.

[0046] Example 1

[0047] The environmentally friendly method for regenerating waste refined clay comprises the following steps:

[0048] A. Using petroleum ether and methanol in a mass ratio of 1:1 as a dual solvent, extracting the refined waste clay through a leaching device, the extraction time is 45 minutes, the amount of waste clay filling in each aggregate grid 2 is 3 / 5 of the volume of the aggregate grid 2, the device used has 7 aggregate grids, 6 of which can be filled, and 6 aggregate grids 2 are filled. The extraction time is the time it takes for the leacher to make one rotation, extracting oil and pigment, and extracting the waste clay to a distillation device to recover the dual solvent;

[0049] B. Add 2 wt.% sulfuric acid solution to the refined waste clay treated in step A, raise the temperature to 90° C., and perform acid treatment activation reaction for 2 hours. After the reaction is completed, separate the solid and liquid by centrifugation, collect the solid to obtain the acidic waste clay, and recover the liquid, which is reused in the acid treatment activation reaction process;

[0050] C. Dissolve the solid sodium hydroxide with water to obtain a 30 wt.% sodium hydroxide solution, adjust the pH of the acidic waste clay to 6, and then dry it to obtain the regenerated activated waste clay.

[0051] Example 2

[0052] The environmentally friendly method for regenerating waste refined clay comprises the following steps:

[0053] A. Using petroleum ether and methanol in a mass ratio of 1:1.5 as a dual solvent, extracting the refined waste clay through a leaching device, the extraction time is 60 minutes, the amount of waste clay filling in each aggregate grid 2 is 3 / 5 of the volume of the aggregate grid 2, the device used has 7 aggregate grids, 6 of which can be filled, and 6 aggregate grids 2 are filled. The extraction time is the time it takes for the leacher to make one rotation, extracting oil and pigment, and extracting the waste clay to a distillation device to recover the dual solvent;

[0054] B. Add 3 wt.% sulfuric acid solution to the refined waste clay treated in step A, raise the temperature to 100° C., and perform acid treatment activation reaction for 1 hour. After the reaction is completed, separate the solid and liquid by centrifugation, collect the solid to obtain the acidic waste clay, and recover the liquid, which is reused in the acid treatment activation reaction process;

[0055] C. Dissolve the solid sodium hydroxide with water to obtain a 34 wt.% sodium hydroxide solution, adjust the pH of the acidic waste clay to 7, and then dry it to obtain regenerated activated waste clay.

[0056] Example 3

[0057] The environmentally friendly method for regenerating waste refined clay comprises the following steps:

[0058] A. Using petroleum ether and methanol in a mass ratio of 1:1.2 as a dual solvent, extracting the refined waste clay through a leaching device, the extraction time is 50 minutes, the amount of waste clay filling in each aggregate grid 2 is 3 / 5 of the volume of the aggregate grid 2, the device used has 7 aggregate grids, 6 of which can be filled, and 6 aggregate grids 2 are filled. The extraction time is the time it takes for the leacher to make one rotation, extracting oil and pigment, and extracting the waste clay to a distillation device to recover the dual solvent;

[0059] B. Add 2.5 wt.% sulfuric acid solution to the refined waste clay treated in step A, raise the temperature to 95° C., and perform acid treatment activation reaction for 1.5 hours. After the reaction is completed, separate the solid and liquid by centrifugation, collect the solid to obtain the acidic waste clay, and recover the liquid, which is reused in the acid treatment activation reaction process;

[0060] C. Dissolve the solid sodium hydroxide with water to obtain a 34 wt.% sodium hydroxide solution, adjust the pH of the acidic waste clay to 7, and then dry it to obtain regenerated activated waste clay.

[0061] Comparative Example 1

[0062] Same as Example 1, except that: in step B, 10 wt.% sulfuric acid was used and the temperature was raised to 300° C. for activation for 1 hour.

[0063] Because a large amount of sodium hydroxide is required for neutralization and no water washing is done after neutralization, a large amount of sodium sulfate remains in the waste clay. Although sodium sulfate has a certain adsorption effect, it is not as effective as the clay, which is equivalent to reducing the effectiveness of the recycled waste clay per unit mass. If water is used for washing, a large amount of industrial wastewater will be generated, which is not environmentally friendly.

[0064] Comparative Example 2

[0065] The same as Example 1, except that: the leaching process uses a common leacher, does not involve countercurrent leaching, and does not pre-fill the aggregate grid with methanol. The leaching is carried out for 0.5 h.

[0066] The oil content of the waste clay used in the above comparative examples and embodiments is 31.7%.

[0067] The bleaching recovery capacity of the regenerated clay was determined by the following method: 250 g of an oil sample was weighed into a container, 3% by mass of regenerated waste clay was added, and the mixture was initially stirred at 250 rpm. The temperature was raised to 120°C within 5 minutes and stirring was continued for 5 minutes. The mixture of oil and clay was immediately filtered into a measuring cylinder while hot, the initial 60 ml of filtrate was discarded, and another 80 ml of filtrate was collected. The color was measured using a 133.4 mm colorimetric cell and compared with the standard clay to calculate the bleaching recovery capacity of the regenerated waste clay.

[0068] Table 1 Test results

[0069] Grease recovery rate% Decolorization recovery % Example 1 96.8 97.5 Example 2 97.6 98.1 Example 3 97.3 97.8 Comparative Example 1 96.5 90.2 Comparative Example 2 90.1 85.3

Claims

1. An environmentally friendly method for regenerating waste refined clay, characterized in that: The following steps are involved: A. Use a double solvent to extract the refined waste clay through a leaching device to extract oil and pigment, and recover the double solvent; B. treating the refined waste clay treated in step A with acid for activation reaction, performing solid-liquid separation after the reaction is completed, collecting the solid to obtain the acidic waste clay, and recovering the liquid to be used again in the acid treatment activation reaction process; C. Dissolve the solid sodium hydroxide with water to adjust the pH of the acidic waste clay, and then dry it to obtain the regenerated activated waste clay; The acid treatment activation reaction process in step B is as follows: adding 2-3 wt.% sulfuric acid solution to the refined waste clay treated in step A and heating the mixture for reaction; The temperature of the acid treatment activation reaction in step B is 90-100° C. and the reaction time is 1-2 hours; The leaching device comprises an extractor (1), a liquid distribution plate (3) is provided at the bottom of the extractor (1), an oil collecting hopper (5) is provided at the bottom of the extractor (1) and is larger than the diameter of the extractor (1), an aggregate grid (2) is provided inside the extractor (1), an aggregate grid (2) is provided inside the extractor (1) and the bottom of the aggregate grid (2) is not provided with a liquid distribution plate (3), the liquid distribution plate (3) is fixedly connected to the oil collecting hopper (5), an oil collecting grid (501) is provided in the oil collecting hopper (5) corresponding to the aggregate grid (2), the oil collecting grid (501) is separated by a partition plate (502) inside the oil collecting hopper (5), the position where the liquid distribution plate (3) is not provided is directly opposite to the discharge grid (503), an anti-clogging spray mechanism (4) is provided below the liquid distribution plate (3) at the bottom of the extractor (1) corresponding to the aggregate grid (2), a liquid extraction pipe (6) is provided on the side wall of the oil collecting hopper (5) corresponding to the oil collecting grid (501), and the liquid extraction pipe (6) is connected to a circulation pump (7); The height of the partition plate (502) gradually decreases on the side close to the discharge grid (503), and is lowest at the other side close to the discharge grid (503); an upper portion of an oil collecting grid (501) with a higher partition plate (502) is provided on one side of the discharge grid (503), and a high-density solvent feeding pipeline (12) and a low-density solvent feeding pipeline (13) are provided at the position corresponding to the aggregate grid (2); an upper portion of an oil collecting grid (501) with a lower partition plate (502) is provided on the other side of the discharge grid (503), and a stirring device (11) is provided at the position corresponding to the aggregate grid (2); and a bottom portion of the oil collecting grid (501) with a lower partition plate (502) is connected to a solvent extraction pipeline (504) on the other side of the discharge grid (503).

2. The environmentally friendly regeneration method of refined waste clay according to claim 1, characterized in that: The dual solvent in step A is petroleum ether and methanol.

3. The environmentally friendly regeneration method of refined waste clay according to claim 2, characterized in that: The mass ratio of petroleum ether to methanol is 1:(1-1.5).

4. The environmentally friendly regeneration method of refined waste clay according to claim 1, characterized in that: The pH in step C is 6-7.

5. The environmentally friendly regeneration method of refined waste clay according to claim 1, characterized in that: The anti-clogging liquid spraying mechanism (4) comprises a plurality of liquid spraying holes (402) arranged on the liquid distribution plate (3), a liquid spraying groove (401) is fixedly arranged below the liquid distribution plate (3) along the direction in which the liquid spraying holes (402) are arranged, the liquid spraying groove (401) wraps the liquid spraying holes (402) inside the liquid spraying groove (401), a circulation pump (7) is connected to one end of the liquid spraying groove (401) close to the outer edge of the liquid distribution plate (3) through a liquid inlet pipe (403), and the bottom of the other end of the liquid spraying groove (401) is connected to the circulation pipe (404). connected to the liquid extraction pipe (6); the liquid spraying trough (401) is located at one end close to the interior of the liquid distribution plate (3), and a buffer zone is provided at a distance from the liquid spraying hole (402) closest to the interior of the liquid distribution plate (3); the bottom of the buffer zone of the liquid spraying trough (401) is connected to the liquid extraction pipe (6) via a circulation pipe (404); the liquid spraying trough (401) is arranged in the same direction as the liquid inlet pipe (403), and the liquid spraying hole (402) on the liquid distribution plate (3) is arranged in the same direction as the liquid inlet pipe (403).

6. The environmentally friendly regeneration method of refined waste clay according to claim 5, characterized in that: The specific extraction process of step A is as follows: methanol and the refined waste clay to be extracted are respectively fed through the high-density solvent feeding pipeline (12) and the stirring (11) to fill all the aggregate grids (2) in the extractor (1), and then the double solvents are added to the aggregate grid (2) in proportion through the high-density solvent feeding pipeline (12) and the low-density solvent feeding pipeline (13). The double solvents overflow from the top of the aggregate grid (2) and flow into the oil collecting grid (501) below, and are pumped into the upper aggregate grid (2) again through the liquid extraction pipe (6), the circulation pump (7), and the liquid inlet pipe (403). The extraction is repeated, and each oil collecting grid (501) is fed through the liquid extraction pipe (6), the circulation pump (7), The liquid inlet pipe (403) repeatedly extracts the material above. As the height of the partition plates (502) on both sides of each oil collecting grid (501) decreases in sequence, the dual solvent in the oil collecting grid (501) will overflow to the next oil collecting grid (501) after being filled. The rotation direction of the upper extractor (1) collecting grid (2) is opposite to the overflow direction of the dual solvent in the lower oil collecting grid (501). The extractor (1) collecting grid (2) rotates to the corresponding position of the discharge grid (503), and all the materials fall, completing the extraction of the refined waste white clay in the collecting grid (2). The dual solvent is extracted from the bottom of the oil collecting grid (501) at the overflow end point through the solvent extraction pipeline (504) to the distillation device to recover the dual solvent.

7. The environmentally friendly regeneration method of refined waste clay according to claim 6, characterized in that: The rotation speed of the extractor (1) during the extraction process is 45-60 minutes per revolution.

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