Method and system for treating polycrystalline silicon slag slurry

Abstract

The invention provides a treatment method and system for polycrystalline silicon slag slurry. The treatment method of the polycrystalline silicon slag slurry comprises the following steps: performing hydrolysis treatment on dry powder in a slag slurry treatment process to obtain a first gas phase and a first liquid phase; washing the first gas phase with water to obtain a second gas phase and a second liquid phase; wherein lime milk is added in the hydrolysis treatment, and lime milk is added in the washing treatment; the second gas phase is discharged into air, and the first liquid phase and the second liquid phase are subjected to wastewater treatment. The treatment method can be used for performing efficient and environment-friendly treatment on the dry powder in the polycrystalline silicon slag slurry, and has relatively high environmental friendliness.

Description

Technical Field

[0001] The invention relates to a method and system for treating polysilicon slag slurry, belonging to the technical field of chemical separation. Background Art

[0002] With the increase in demand, the photovoltaic industry and the integrated circuit industry have developed rapidly. Polysilicon is the core raw material of the photovoltaic industry and the integrated circuit industry, so more and more companies have begun to produce polysilicon.

[0003] At present, almost all polysilicon production enterprises adopt the modified Siemens process, and a large amount of slurry will be generated in the process of producing polysilicon by the modified Siemens process. For example, a certain amount of slurry will be generated in the chlorine hydrogen chemical section of polysilicon production. The slurry mainly includes chlorosilane, silicon powder and metal chloride (for example, AlCl 3 ), etc. The treatment and utilization of slurry is a difficult problem that the polysilicon industry must face. Summary of the invention

[0004] The invention provides a method for treating polysilicon slurry. The method can treat dry powder in the polysilicon slurry in an efficient and environmentally friendly manner and has high environmental friendliness.

[0005] The present invention provides a polysilicon slurry processing system, which is used in the above-mentioned recovery method of the embodiment. The processing system has a simple structure and is suitable for wide promotion and application.

[0006] The present invention provides a method for treating polysilicon slurry, which comprises the following steps:

[0007] Hydrolyzing the dry powder in the slurry treatment process to obtain a first gas phase and a first liquid phase;

[0008] Using water to wash the first gas phase to obtain a second gas phase and a second liquid phase;

[0009] Wherein, lime milk is added in the hydrolysis process, and lime milk is added in the washing process;

[0010] The second gas phase is discharged into the air, and the first liquid phase and the second liquid phase are subjected to wastewater treatment.

[0011] The treatment method as described above, wherein the hydrolysis treatment is carried out in a continuous manner, and during the hydrolysis treatment, the temperature is 40 to 85° C. and the pressure is 0.002 to 0.05 MPaG; or,

[0012] The hydrolysis treatment is performed in an intermittent manner. During the hydrolysis treatment, the temperature is 40 to 85° C., the time is 0.2 to 2 hours, and the pressure is 0.002 to 0.05 MPaG.

[0013] The treatment method as described above, wherein the washing treatment is a continuous treatment, during which the temperature is 40 to 85°C and the spray volume is 5 to 40 m 3 / h; or,

[0014] The washing treatment is performed in an intermittent manner. During the washing treatment, the temperature is 40 to 85°C, the spray volume is 5 to 40 m 3 / h, time is 0.2~2h.

[0015] The treatment method as described above, wherein, further comprises: condensing the first liquid phase to obtain a third liquid phase, and using the third liquid phase to perform the hydrolysis treatment.

[0016] In the treatment method as described above, the temperature of the third liquid phase is 35-60°C.

[0017] The present invention provides a processing system for implementing the above-mentioned polysilicon slurry processing method, which comprises: a dry powder hydrolysis kettle and a tail gas washing tower;

[0018] The gas phase outlet of the dry powder hydrolysis kettle is communicated with the gas phase inlet of the tail gas washing tower.

[0019] The processing system as described above, wherein the dry powder hydrolysis kettle comprises a kettle body and an empty tower located on the top of the kettle body and interconnected with the kettle body;

[0020] The gas phase outlet is located at the top of the empty tower, and the empty tower has a liquid phase inlet;

[0021] The kettle is used for hydrolysis treatment.

[0022] The processing system as described above, wherein the top of the empty tower is further provided with a nitrogen inlet; and / or,

[0023] The empty tower also has an inlet for lime milk.

[0024] The processing system as described above, wherein, further comprises: a dry powder hydrolyzate condenser;

[0025] The tower kettle outlet of the kettle body is connected to the inlet of the dry powder hydrolyzate condenser, and the outlet of the dry powder hydrolyzate condenser is connected to the empty tower.

[0026] The treatment system as described above, wherein, further comprises: a tail gas tower pump;

[0027] The bottom of the tail gas washing tower is communicated with the inlet of the tail gas tower pump, and the outlet of the tail gas tower pump is communicated with the top of the tail gas washing tower.

[0028] The present invention provides a method for treating polysilicon slurry, which can achieve efficient and environmentally friendly treatment of dry powder by successively performing hydrolysis treatment and washing treatment on dry powder in the slurry treatment process, and has excellent environmental friendliness.

[0029] The present invention provides a polysilicon slurry processing system for implementing the above recovery method. The processing system has a simple structure and is suitable for wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present invention or related technologies. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of a process flow of hydrolysis treatment in some embodiments of the present invention;

[0032] Figure 2 Schematic diagram of the process flow of washing treatment in some embodiments of the present invention.

[0033] Description of reference numerals:

[0034] 2: Dry powder hydrolyzate pump;

[0035] 3: Dry powder hydrolyzate condenser;

[0036] 4: Tail gas scrubber;

[0037] 5: Exhaust tower pump;

[0038] 11: kettle body;

[0039] 12: Empty pagoda. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Figure 1 A schematic diagram of a process flow of hydrolysis treatment in some embodiments of the present invention; Figure 2 Schematic diagram of the process flow of washing treatment in some embodiments of the present invention. Figure 1 and Figure 2As shown, the first aspect of the present invention provides a method for treating polysilicon slurry, comprising the following steps:

[0042] Hydrolyzing the dry powder in the slurry treatment process to obtain a first gas phase and a first liquid phase;

[0043] Using water to wash the first gas phase to obtain a second gas phase and a second liquid phase;

[0044] Among them, lime milk is added in the hydrolysis treatment and lime milk is added in the washing treatment;

[0045] The second gas phase is discharged into the air, and the first liquid phase and the second liquid phase are treated as wastewater.

[0046] The present invention does not specifically limit the dry powder, and the dry powder can be a dry powder from which the slurry is removed during the slurry treatment process. The dry powder mainly includes silicon powder and a small amount of chlorosilane.

[0047] The treatment method of the present invention specifically includes: under the action of lime milk, the dry powder in the slurry treatment process is hydrolyzed, and the lime milk reacts with the dry powder to generate a first gas phase including hydrogen and hydrogen chloride and a first liquid phase including calcium chloride, calcium silicate and silicon dioxide; then, under the action of lime milk, the first gas phase is washed with water, and the lime milk reacts with hydrogen chloride to obtain a second gas phase including hydrogen and a second liquid phase including calcium chloride, wherein the second gas phase can be discharged into the air, and the first liquid phase and the second liquid phase can be used for wastewater treatment.

[0048] In some embodiments, the lime milk may be lime milk with a mass percentage of 80%.

[0049] The present invention can efficiently remove waste in the dry powder by sequentially performing hydrolysis treatment and washing treatment on the dry powder in the process of polysilicon slurry treatment. The treatment method has excellent environmental friendliness and is suitable for wide promotion and application.

[0050] In the present invention, specific parameters of the hydrolysis treatment and the washing treatment may also be selected to further improve the treatment efficiency of the treatment method.

[0051] In the present invention, the hydrolysis treatment can be performed in a continuous manner or in an intermittent manner. When the hydrolysis treatment is performed in a continuous manner, the temperature is 40 to 85° C. and the pressure is 0.002 to 0.05 MPaG during the hydrolysis treatment;

[0052] When the hydrolysis treatment is performed in an intermittent manner, during the hydrolysis treatment, the temperature is 40 to 85° C., the time is 0.2 to 2 h, and the pressure is 0.002 to 0.05 MPaG.

[0053] For example, during the hydrolysis treatment, the temperature may be any one of 40°C, 50°C, 60°C, 70°C, 80°C, 85°C, or a range consisting of any two thereof;

[0054] The pressure may be any one of 0.002 MPa, 0.003 MPa, 0.01 MPa, 0.03 MPa, 0.04 MPa, 0.05 MPa, or a range consisting of any two of them;

[0055] When the hydrolysis treatment is a batch treatment, the time may be any one of 0.2 h, 0.3 h, 0.5 h, 1 h, and 2 h, or a range consisting of any two of them.

[0056] When the parameters of the hydrolysis treatment meet the above-mentioned range, the lime milk and the dry powder can be fully reacted to generate a first gas phase including hydrogen and hydrogen chloride and a first liquid phase including calcium chloride, calcium silicate and silicon dioxide while saving energy, thereby promoting subsequent washing treatment and achieving more efficient treatment of the dry powder.

[0057] In the present invention, the washing treatment can be carried out in a continuous manner or in an intermittent manner. When the washing treatment is carried out in a continuous manner, the temperature is 40 to 85°C and the spraying volume is 5 to 40 m 3 / h;

[0058] When the washing treatment is intermittent, the temperature is 40-85°C and the spray volume is 5-40m 3 / h, time is 0.2~2h.

[0059] For example, in the washing process, the temperature may be any one of 40°C, 50°C, 60°C, 70°C, 80°C, 85°C, or a range consisting of any two thereof;

[0060] The spray volume can be 5m 3 / h、7m 3 / h、10m 3 / h、20m 3 / h、30m 3 / h、40m 3 / h, any one of them, and the range of any two of them;

[0061] When the washing treatment is an intermittent treatment, the time may be any one of 0.2 h, 0.3 h, 0.5 h, 1 h, 1.5 h, and 2 h, or a range consisting of any two of them.

[0062] When the parameters of the washing treatment meet the above ranges, the first gas phase can be washed more fully while saving energy, and the lime milk reacts with hydrogen chloride to obtain a second gas phase including hydrogen and a second liquid phase including calcium chloride, thereby more efficiently processing the dry powder.

[0063] In some embodiments of the present invention, the treatment method further comprises condensing the first liquid phase to obtain a third liquid phase, and using the third liquid phase for hydrolysis.

[0064] Specifically, the first liquid phase is condensed to obtain a third liquid phase that matches the temperature of the hydrolysis treatment, and then the dry powder is hydrolyzed using the third liquid phase to obtain a first gas phase and a first liquid phase.

[0065] The present invention performs condensation treatment on the first liquid phase to obtain a third liquid phase, and then uses the third liquid phase for hydrolysis treatment. The condensation treatment can reduce the heat in the dry powder hydrolysis treatment process, avoid over-temperature conditions in the hydrolysis treatment, and do not require too much water to cool the hydrolysis treatment during the hydrolysis treatment, thereby saving water. It is worth mentioning that, while realizing the recycling of water resources, waste in the first liquid phase can be further removed to improve the treatment efficiency.

[0066] Furthermore, the temperature of the third liquid phase is 35-60°C.

[0067] Illustratively, the temperature of the third liquid phase may be any one of 35° C., 40° C., 45° C., 50° C., 55° C., 60° C., or a range consisting of any two thereof.

[0068] When the temperature of the third liquid phase meets the above range, the third liquid phase can more efficiently hydrolyze the dry powder to obtain the first gas phase and the first liquid phase while saving energy.

[0069] The second aspect of the present invention provides a processing system for implementing the polysilicon slurry processing method of the first aspect, comprising: a dry powder hydrolysis kettle and a tail gas washing tower 4;

[0070] The gas phase outlet of the dry powder hydrolysis kettle is communicated with the gas phase inlet of the tail gas washing tower 4.

[0071] Specifically, the dry powder is hydrolyzed in a dry powder hydrolysis kettle to obtain a first gas phase and a first liquid phase. The first gas phase is output through the gas phase outlet of the dry powder hydrolysis kettle, enters the tail gas washing tower 4 through the gas phase inlet of the tail gas washing tower 4, and is washed in the tail gas washing tower 4 to obtain a second gas phase and a second liquid phase, wherein the second gas phase is discharged into the air, and the first liquid phase and the second liquid phase are treated as wastewater.

[0072] The polysilicon slurry processing system of the present invention is used to implement the above-mentioned polysilicon slurry processing method. The processing system can efficiently and environmentally friendly process dry powder in the polysilicon slurry, has a simple structure, and is suitable for wide promotion and application.

[0073] In some embodiments of the present invention, the dry powder hydrolysis kettle comprises a kettle body 11 and an empty tower 12 located on the top of the kettle body 11 and interconnected with the kettle body 11;

[0074] The gas phase outlet is located at the top of the empty tower 12, and the empty tower 12 has a liquid phase inlet;

[0075] The kettle body 11 is used for performing hydrolysis treatment.

[0076] Specifically, the dry powder hydrolysis kettle includes a kettle body 11 and an empty tower 12 from top to bottom. The water required for the hydrolysis treatment enters the empty tower 12 through the liquid phase inlet of the empty tower, and enters the kettle body 11 through the empty tower 12. The dry powder is hydrolyzed in the kettle body 11, and the first gas phase generated by the hydrolysis treatment is output through the gas phase outlet at the top of the empty tower 12.

[0077] In some embodiments, the empty tower 12 is further provided with a nozzle. Water enters the empty tower 12 through the liquid phase inlet and can be sprayed into the kettle body 11 through the nozzle. Further, a distribution plate is provided below the nozzle, and the distribution plate can enhance the spraying effect. In some embodiments, the distribution plate can be located 500-1000 mm below the nozzle.

[0078] The present invention allows water to enter the kettle body 11 through the empty tower 12 for hydrolysis treatment, thereby improving the efficiency of the hydrolysis treatment and further improving the treatment efficiency of the dry powder.

[0079] In some embodiments of the present invention, a nitrogen inlet is further provided at the top of the empty tower 12 .

[0080] Specifically, nitrogen enters the empty tower 12 through the nitrogen inlet at the top of the empty tower 12 , which can maintain the nitrogen environment at the top of the empty tower 12 and prevent air from returning to the empty tower 12 .

[0081] In some embodiments of the present invention, the empty tower 12 further has an inlet for lime milk.

[0082] That is, the lime milk enters the empty tower 12 through the lime milk inlet of the empty tower 12, and enters the kettle body 11 through the empty tower 12 for hydrolysis treatment. In some embodiments, the lime milk inlet is located above the liquid phase inlet.

[0083] Allowing the lime milk to enter the kettle body 11 through the empty tower 12 can promote the dispersion of the lime milk and thus improve the effect of the hydrolysis treatment.

[0084] In some embodiments of the present invention, the processing system further comprises: a dry powder hydrolyzate condenser 3;

[0085] The tower kettle outlet of the kettle body 11 is communicated with the inlet of the dry powder hydrolyzate condenser 3 , and the outlet of the dry powder hydrolyzate condenser 3 is communicated with the empty tower 12 .

[0086] Specifically, the first liquid phase produced by the hydrolysis treatment is output through the tower kettle outlet of the kettle body 11, enters the dry powder hydrolyzate condenser 3 through the inlet of the dry powder hydrolyzate condenser 3, and is condensed in the dry powder hydrolyzate condenser 3 to obtain a third liquid phase. The third liquid phase is output through the outlet of the dry powder hydrolyzate condenser 3, enters the empty tower 12, and then enters the kettle body 11 to participate in the hydrolysis treatment.

[0087] In some embodiments, a dry powder hydrolysis liquid pump 2 is also included. The first liquid phase is pumped out from the bottom of the dry powder hydrolysis kettle through the dry powder hydrolysis liquid pump 2 and enters the dry powder hydrolysis liquid pump 2. After being output by the dry powder hydrolysis liquid pump 2, it enters the dry powder hydrolysis condenser and is condensed by the dry powder hydrolysis condenser to form a third liquid phase.

[0088] In some embodiments of the present invention, the treatment system further comprises: a tail gas tower pump 5;

[0089] The bottom of the tail gas washing tower 4 is communicated with the inlet of the tail gas tower pump 5 , and the outlet of the tail gas tower pump 5 is communicated with the top of the tail gas washing tower 4 .

[0090] Specifically, the second liquid phase is output through the bottom of the tail gas washing tower 4, enters the tail gas tower pump 5 through the inlet of the tail gas tower pump 5, is output through the outlet of the tail gas tower pump 5, and enters the tail gas washing tower 4 through the top of the tail gas washing tower 4 for washing treatment.

[0091] The present invention uses the second liquid phase to participate in the washing process again, which can further remove the waste in the second liquid phase, save water and improve the utilization rate of resources.

[0092] The technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0093] Example 1

[0094] like Figure 1 and Figure 2 As shown, the polysilicon slurry treatment system of this embodiment includes: a dry powder hydrolysis kettle, a dry powder hydrolysis liquid pump 2, a dry powder hydrolysis liquid condenser 3, a tail gas washing tower 4, and a tail gas tower pump 5;

[0095] The dry powder hydrolysis kettle comprises a kettle body 11 and an empty tower 12 located at the top of the kettle body 11 and interconnected with the kettle body 11; the gas phase outlet is located at the top of the empty tower 12, the empty tower 12 has a liquid phase inlet and a lime milk inlet, the top of the empty tower 12 also has a nitrogen inlet, the empty tower 12 also has a nozzle, and a distribution plate is provided below the nozzle, and the distribution plate is located 600 mm below the nozzle;

[0096] The kettle body 11 is used for hydrolysis treatment, the kettle outlet of the kettle body 11 is connected to the inlet of the dry powder hydrolyzate pump 2, the outlet of the dry powder hydrolyzate pump 2 is connected to the inlet of the dry powder hydrolyzate condenser 3, and the outlet of the dry powder hydrolyzate condenser 3 is connected to the empty tower 12;

[0097] The gas phase outlet of the dry powder hydrolysis kettle is connected to the gas phase inlet of the washing tower, the kettle of the tail gas washing tower 4 is connected to the inlet of the tail gas tower pump 5, and the outlet of the tail gas tower pump 5 is connected to the top of the tail gas washing tower 4.

[0098] Example 2

[0099] The method for treating the polysilicon slurry of this embodiment is carried out using the treatment system of Embodiment 1, and specifically includes:

[0100] Water is introduced into the empty tower 12 through the liquid phase inlet of the empty tower 12, lime milk is introduced into the empty tower 12 through the lime milk inlet of the empty tower 12, water and lime milk are introduced into the kettle 11 through the empty tower 12, and the dry powder is hydrolyzed in the kettle 11 to obtain a first liquid phase and a first gas phase;

[0101] The first liquid phase is outputted through the tower kettle outlet of the kettle body 11, enters the dry powder hydrolyzate pump 2 through the inlet of the dry powder hydrolyzate pump 2, is outputted through the outlet of the dry powder hydrolyzate pump 2, enters the dry powder hydrolyzate condenser 3 through the inlet of the dry powder hydrolyzate condenser 3 for condensation treatment, and obtains the third liquid phase, the third liquid phase is outputted through the outlet of the dry powder hydrolyzate condenser 3, enters the empty tower 12, and the first liquid phase is outputted through the outlet pipeline of the dry powder hydrolyzate pump 2 for wastewater treatment;

[0102] Nitrogen enters the empty tower 12 through the nitrogen inlet, the first gas phase is output through the gas phase outlet at the top of the empty tower 12, enters the tail gas washing tower 4 through the gas phase inlet of the tail gas washing tower 4, and is washed under the action of lime milk to obtain a second liquid phase and a second gas phase, the second liquid phase is output through the tower kettle of the tail gas washing tower 4, enters the tail gas tower pump 5 through the inlet of the tail gas tower pump 5, is output through the outlet of the tail gas tower pump 5, enters the tail gas washing tower 4 through the top of the tail gas washing tower 4, part of the second liquid phase is output through the pipeline of the tail gas tower pump 5 for wastewater treatment, and the second gas phase is discharged into the air through the top of the tail gas washing tower 4;

[0103] Among them, in the hydrolysis treatment, the temperature is 55°C, the time is 0.5h, and the pressure is 0.006MPaG;

[0104] During the washing process, the temperature is 55°C and the spray volume is 20m 3 / h, time is 0.5h;

[0105] The temperature of the third liquid phase was 50°C.

[0106] Example 3

[0107] The method for treating the polysilicon slurry in this embodiment is basically the same as that in Embodiment 2, except that:

[0108] Water is introduced into the empty tower 12 through the liquid phase inlet of the empty tower 12, lime milk is introduced into the empty tower 12 through the lime milk inlet of the empty tower 12, water and lime milk are introduced into the kettle 11 through the empty tower 12, and the dry powder is hydrolyzed in the kettle 11 to obtain a first liquid phase and a first gas phase;

[0109] The first liquid phase is outputted through the tower kettle outlet of the kettle body 11, enters the dry powder hydrolyzate pump 2 through the inlet of the dry powder hydrolyzate pump 2, is outputted through the outlet of the dry powder hydrolyzate pump 2, enters the empty tower 12, and the first liquid phase is outputted through the outlet pipeline of the dry powder hydrolyzate pump 2 for wastewater treatment;

[0110] Nitrogen enters the empty tower 12 through the nitrogen inlet, the first gas phase is output through the gas phase outlet at the top of the empty tower 12, enters the tail gas washing tower 4 through the gas phase inlet of the tail gas washing tower 4, and is washed under the action of lime milk to obtain a second liquid phase and a second gas phase, the second liquid phase is output through the tower kettle of the tail gas washing tower 4, enters the tail gas tower pump 5 through the inlet of the tail gas tower pump 5, is output through the outlet of the tail gas tower pump 5, enters the tail gas washing tower 4 through the top of the tail gas washing tower 4, part of the second liquid phase is output through the pipeline of the tail gas tower pump 5 for wastewater treatment, and the second gas phase is discharged into the air through the top of the tail gas washing tower 4;

[0111] Among them, in the hydrolysis treatment, the temperature is 55°C, the time is 0.5h, and the pressure is 0.006MPaG;

[0112] During the washing process, the temperature was 55°C, the spray volume was 20m3 / h, and the time was 0.5h.

[0113] Compared with Example 3, Example 2 adds a dry powder hydrolyzate condenser 3 in the hydrolysis process, which can avoid over-temperature conditions in the hydrolysis process and save water. Every 100kg of slurry can save 10m 3 Reduce water consumption and save production costs.

[0114] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A method for treating polysilicon slurry, characterized in that: The following steps are involved: Hydrolyzing the dry powder in the slurry treatment process to obtain a first gas phase and a first liquid phase; Using water to wash the first gas phase to obtain a second gas phase and a second liquid phase; Wherein, lime milk is added in the hydrolysis process, and lime milk is added in the washing process; The second gas phase is discharged into the air, and the first liquid phase and the second liquid phase are subjected to wastewater treatment.

2. The processing method according to claim 1, characterized in that: The hydrolysis treatment is carried out in a continuous manner, wherein the temperature is 40 to 85° C. and the pressure is 0.002 to 0.05 MPaG; or, The hydrolysis treatment is performed in an intermittent manner. During the hydrolysis treatment, the temperature is 40 to 85° C., the time is 0.2 to 2 hours, and the pressure is 0.002 to 0.05 MPaG.

3. The processing method according to claim 1 or 2, characterized in that: The washing process is a continuous process, in which the temperature is 40 to 85°C and the spray volume is 5 to 40 m 3 / h; or, The washing treatment is performed in an intermittent manner. During the washing treatment, the temperature is 40 to 85°C, the spray volume is 5 to 40 m 3 / h, time is 0.2~2h.

4. The processing method according to any one of claims 1 to 3, characterized in that: The method further includes condensing the first liquid phase to obtain a third liquid phase, and using the third liquid phase to perform the hydrolysis treatment.

5. The processing method according to claim 4, characterized in that: The temperature of the third liquid phase is 35-60°C.

6. A processing system for implementing the method for processing polysilicon slurry according to any one of claims 1 to 5, characterized in that: include: Dry powder hydrolysis kettle and tail gas scrubber; The gas phase outlet of the dry powder hydrolysis kettle is communicated with the gas phase inlet of the tail gas washing tower.

7. The processing system according to claim 6, characterized in that The dry powder hydrolysis kettle comprises a kettle body and an empty tower located on the top of the kettle body and interconnected with the kettle body; The gas phase outlet is located at the top of the empty tower, and the empty tower has a liquid phase inlet; The kettle is used for carrying out hydrolysis treatment.

8. The processing system according to claim 7, characterized in that The top of the empty tower is also provided with a nitrogen inlet; and / or, The empty tower also has an inlet for lime milk.

9. The processing system according to any one of claims 7 to 8, characterized in that: Also includes: Dry powder hydrolyzate condenser; The tower kettle outlet of the kettle body is connected to the inlet of the dry powder hydrolyzate condenser, and the outlet of the dry powder hydrolyzate condenser is connected to the empty tower.

10. The processing system according to any one of claims 6 to 9, characterized in that: Also includes: Exhaust tower pump; The bottom of the tail gas washing tower is communicated with the inlet of the tail gas tower pump, and the outlet of the tail gas tower pump is communicated with the top of the tail gas washing tower.

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