Slag slurry device

Abstract

The utility model discloses a slag slurry device and belongs to the technical field of polycrystalline silicon production. The device comprises a diatomite storage mechanism and a scraper driving mechanism, an outlet of the diatomite storage mechanism is connected with the rotary drum mechanism, and the diatomite storage mechanism outputs diatomite to filter cloth of the rotary drum mechanism under the action of negative pressure in the rotary drum mechanism at the beginning of slag slurry separation or when a scraper advances to a preset distance; the scraper driving mechanism is connected with the scraper and drives the scraper to be close to and far away from the filter cloth. By arranging a plurality of valves and the diatomite storage mechanism, the diatomite consumption can be reduced, the feeding stopping time of the rotary drum is shortened, the slag slurry treatment efficiency of the rotary drum is improved, and the slag discharging effect of the self-hydrogenation system is further improved; and a scraper is arranged, so that solid silicon powder adsorbed on the surface layer of the rotary drum is uniformly scraped, the solid silicon powder is fully adsorbed by diatomite, and the utilization efficiency of the diatomite is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon production, in particular to a slag slurry device. Background Art

[0002] At present, the cold hydrogenation process will produce slurry by-products in the production of trichlorosilane. The main components of the slurry are fine silicon powder, minerals, and high boiling points. The slurry discharge system is mainly discharged to the slurry device through the hydrogenation quenching tower.

[0003] After the drum of the slurry device completes the adsorption of solids such as silicon powder under vacuum, the surface thickness of the drum is slowly thinned by the scraper. The traditional process uses manual advancement of the scraper and observation through a sight glass. The surface thickness cannot be scraped off evenly, and the diatomaceous earth thinning speed increases. After the thickness is thinned to a certain thickness, pre-coating is required. The pre-coating frequency increases, the diatomaceous earth consumption increases, and the slurry processing capacity is reduced, which in turn affects the slag discharge of the hydrogenation system. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a slurry device that can greatly reduce the frequency of pre-coating, reduce diatomaceous earth consumption, reduce the time the drum stops feeding, improve the efficiency of the drum in processing slurry, and thus improve the slag discharge effect of the self-hydrogenation system.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] On the one hand, the utility model provides a slurry device, including a diatomaceous earth storage mechanism and a scraper driving mechanism;

[0007] The outlet of the diatomite storage mechanism is connected to the drum mechanism, and at the beginning of slurry separation or when the scraper advances to a preset distance, the diatomite storage mechanism outputs diatomite to the filter cloth of the drum mechanism under the action of negative pressure in the drum mechanism;

[0008] The scraper driving mechanism is connected to the scraper and drives the scraper to approach and move away from the filter cloth.

[0009] Optionally, a displacement measuring mechanism is further included, which is installed between the scraper driving mechanism and the scraper to measure the displacement of the scraper driven by the scraper driving mechanism.

[0010] Optionally, a clear liquid tank is further included, wherein a first inlet of the clear liquid tank is connected to a liquid outlet of the drum mechanism, and an outlet of the clear liquid tank is connected to a vacuum mechanism that generates negative pressure in the drum mechanism.

[0011] Optionally, it also includes a residue tank, the residue inlet of the residue tank is connected to the residue outlet of the drum mechanism, the first outlet of the residue tank is connected to the inlet of the hydrolysis tank, the second outlet of the residue tank is connected to the inlet of the condensate tank, and the outlet of the condensate tank is connected to the second inlet of the clear liquid tank.

[0012] Optionally, valve one is installed between the outlet of the slag receiving tank and the slag inlet of the drum mechanism, valve two is installed between the slag inlet of the filter slag tank and the slag outlet of the drum mechanism, and valve three is installed between the outlet of the diatomaceous earth storage mechanism and the slag inlet of the drum mechanism.

[0013] Optionally, a stop valve is installed at the inlet of the slag receiving tank, and the other end of the stop valve is connected to the regulating valve.

[0014] Optionally, a liquid level gauge for measuring liquid level is installed in the slag receiving tank and the slag filtering tank respectively.

[0015] On the other hand, the utility model provides a method for using a slurry device, wherein the slurry device is the device described in the first aspect, and the method comprises the following steps:

[0016] At the beginning of slurry separation, the outlet of the diatomaceous earth storage mechanism is opened, and under the action of negative pressure in the drum mechanism, the diatomaceous earth storage mechanism outputs diatomaceous earth to the filter cloth of the drum mechanism, and the filter cloth is pre-coated with diatomaceous earth;

[0017] When the drum is running, under the action of negative pressure in the drum mechanism, the solid silicon powder in the slurry is adsorbed on the filter cloth containing diatomaceous earth to form a solid-liquid mixture;

[0018] The scraper driving mechanism drives the scraper to approach the filter cloth to scrape off the solid-liquid mixture on the filter cloth;

[0019] Under the action of negative pressure in the drum mechanism, the liquid mixture in the slurry is vacuum adsorbed to the clear liquid tank;

[0020] When the scraper moves to a preset distance, the scraper driving mechanism drives the scraper away from the filter cloth, and the filter cloth is pre-coated with diatomaceous earth again.

[0021] Optionally, the scraped solid-liquid mixture is discharged from a slag outlet of the drum mechanism;

[0022] The process of the scraper drive mechanism driving the scraper close to the filter cloth includes:

[0023] When there is no solid-liquid mixture output from the slag outlet of the drum mechanism, the scraper driving mechanism drives the scraper to approach the filter cloth according to a preset step length;

[0024] When solid-liquid mixture is output from the slag outlet of the drum mechanism, the scraper maintains the current position.

[0025] Optionally, after the pre-coating of diatomaceous earth is completed, the scraper driving mechanism drives the scraper back to the starting position, and the scraper driving mechanism drives the scraper to approach the filter cloth again.

[0026] Optionally, when the liquid level of the slag receiving tank does not exceed the first preset liquid level, feedback is given to the regulating valve and the stop valve, the stop valve is opened, and the regulating valve is fully opened;

[0027] When the liquid level of the slag receiving tank exceeds the first preset liquid level, feedback is given to the regulating valve and the stop valve, the stop valve opens, and the regulating valve is not fully opened;

[0028] When the liquid level of the slag receiving tank reaches the second preset liquid level, it is fed back to the regulating valve and the stop valve, the regulating valve is closed, the stop valve is closed, and the slag receiving is ended.

[0029] Optionally, when the liquid level of the filter residue tank exceeds a third preset liquid level, the feedback valve is opened to discharge the solid mixture in the filter residue tank to the hydrolysis tank;

[0030] When the liquid level of the filter residue tank reaches a fourth preset liquid level, closing the feedback valve;

[0031] The liquid mixture in the filter residue tank is heated by steam, discharged in the form of gas phase, condensed into a condensate tank through a circulating water condenser, and the condensed liquid in the condensate tank is adsorbed into the clear liquid tank under the action of negative pressure in the drum mechanism. Beneficial Effects

[0032] Compared with the prior art, the utility model has the following beneficial effects:

[0033] (1) The utility model provides a diatomite storage mechanism, which can pre-coat diatomite and add pre-coated diatomite, greatly reducing the pre-coating frequency, reducing diatomite consumption, reducing the drum stop feeding time, improving the drum treatment efficiency of slurry, and thus improving the slag discharge effect of the self-hydrogenation system;

[0034] (2) The utility model provides an automatically rotating scraper, so that the solid silicon powder adsorbed on the surface of the drum is evenly scraped off, so that the diatomaceous earth fully adsorbs the solid silicon powder, thereby improving the utilization efficiency of the diatomaceous earth;

[0035] (3) The utility model controls whether the automatic rotating scraper device of the rotary drum for adsorption and separation of slag slurry contacts the slag and the frequency of contacting the slag by setting a series of valves such as a regulating valve and a shut-off valve, thereby ensuring the accuracy and stability of the rotary drum separation of slag slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure shows a schematic structural diagram of a slurry device of the utility model in one embodiment;

[0037] Figure 2 The figure shows a flow chart of the use of the slurry device of the utility model in one embodiment;

[0038] In the figure: 1-slag receiving tank; 2-diatomaceous earth storage mechanism; 3-rotating drum; 4-filter cloth; 5-scraper; 6-scraper driving mechanism; 7-displacement measuring mechanism; 8-filter residue tank; 9-clear liquid tank; 10-sight glass; 11-valve one; 12-valve two; 13-valve three; 14-regulating valve; 15-stop valve, 16-vacuum mechanism; 17-hydrolysis tank; 18-condensation tank; 19-circulating water condenser; 20-feedback valve. DETAILED DESCRIPTION

[0039] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0040] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Example 1

[0042] like Figure 1 As shown, this embodiment introduces a slurry device, including a slurry receiving tank 1, a diatomaceous earth storage mechanism 2, a clear liquid tank 9, a filter slag tank 8 and a scraper driving mechanism 6;

[0043] A stop valve 15 is installed at the inlet of the slag receiving pot 1 , and the other end of the stop valve 15 is connected to the regulating valve 14 .

[0044] In this embodiment, the stop valve can control whether the automatic rotating scraper device of the rotary drum for adsorption and separation of slurry continues to collect slag, and the regulating valve can control the slag collecting speed of the automatic rotating scraper device of the rotary drum for adsorption and separation of slurry. The setting of the stop valve and the regulating valve ensures that the automatic rotating scraper device of the rotary drum for adsorption and separation of slurry can control the slag collection according to the specific situation of slurry separation, effectively improve the efficiency of the rotary drum in treating slurry, and thereby improve the slag discharge effect of the self-hydrogenation system.

[0045] The outlet of the diatomaceous earth storage mechanism 2 is connected to the drum mechanism. When the slurry is initially separated or the scraper 5 advances to a preset distance, the diatomaceous earth storage mechanism 2 outputs diatomaceous earth to the filter cloth 4 of the drum mechanism under the action of the negative pressure in the drum mechanism.

[0046] In this embodiment, the rotary drum includes a drum core, a support plate and a drum surface, and the filter cloth installed on the drum surface can be canvas or metal wire cloth.

[0047] The drum core provides a vacuum environment to the clean liquid tank through a vacuum mechanism, and the clean liquid tank then provides a vacuum environment to the drum through a pipe connected to the drum. It should be noted that all connection methods in this embodiment are through pipe connections to facilitate slurry separation.

[0048] In order to better ensure the accuracy and stability of slurry separation in the device of this embodiment, a valve 11 is installed between the outlet of the slag receiving tank 1 and the inlet of the drum mechanism, and a valve 3 13 is installed between the outlet of the diatomaceous earth storage mechanism 2 and the inlet of the drum mechanism.

[0049] The first inlet of the clear liquid tank 9 is connected to the liquid outlet of the drum mechanism, and the outlet of the clear liquid tank 9 is connected to the vacuum mechanism 16 for generating negative pressure in the drum mechanism.

[0050] One side outer surface of the drum mechanism is provided with a sight glass 10 for observing the drum mechanism. The setting of the sight glass facilitates the experimenter to observe the specific slurry separation situation and make a response method.

[0051] The scraper drive mechanism 6 is connected to the scraper 5, and drives the scraper 5 to approach and move away from the filter cloth 4. The scraper drive mechanism and the scraper can be connected by a chain or by other connection methods; the scraper drive mechanism can be a variable frequency motor or other drive devices.

[0052] The slurry device further comprises a displacement measuring mechanism 7, which is installed between the scraper driving mechanism 6 and the scraper 5, and is used to measure the displacement of the scraper 5 driven by the scraper driving mechanism 6. The displacement measuring mechanism may be a scale or other device capable of measuring displacement.

[0053] The slag inlet of the filter residue tank 8 is connected to the slag outlet of the drum mechanism, and a valve 12 is installed between the slag inlet of the filter residue tank 8 and the slag outlet of the drum mechanism.

[0054] The first outlet of the filter residue tank 8 is connected to the inlet of the hydrolysis tank 17 , the second outlet of the filter residue tank 8 is connected to the inlet of the condensate tank 18 , and the outlet of the condensate tank 18 is connected to the second inlet of the clear liquid tank 9 .

[0055] A valve 20 is installed between the filter residue tank 8 and the hydrolysis tank 17, and a circulating water condenser 19 is installed between the filter residue tank 8 and the condensate tank 18.

[0056] In order to accurately control the regulating valve and the stop valve, level gauges for measuring liquid levels are installed in the slag receiving tank 1 and the slag filtering tank 8 respectively.

[0057] The liquid level meter can be a tuning fork liquid level meter, a nuclear magnetic liquid level meter, a nuclear liquid level meter, etc.

[0058] When this embodiment is used, by providing multiple valves and diatomaceous earth storage mechanisms, diatomaceous earth can be pre-coated and additional pre-coated diatomaceous earth can be added, thereby reducing diatomaceous earth consumption, reducing the time for the drum to stop feeding, and improving the efficiency of the drum in treating slurry, thereby improving the slag discharge effect of the self-hydrogenation system; and by providing a scraper, the solid silicon powder adsorbed on the surface of the drum can be evenly scraped off, so that the diatomaceous earth can fully adsorb the solid silicon powder, thereby improving the utilization efficiency of the diatomaceous earth. Example 2

[0059] like Figure 2 As shown, this embodiment introduces a method for using a slurry device, the slurry device is the device described in Example 1, and the method comprises the following steps:

[0060] Discharge the slag slurry after hydrogenation slagging into the slag receiving tank 1;

[0061] In order to better ensure the stability of slag connection, the regulating valve 14 controls the slag connection speed according to the liquid level feedback of the slag connection tank 1;

[0062] The stop valve 15 controls whether to continue receiving slag according to the liquid level feedback of the slag receiving tank 1.

[0063] In this embodiment, when the liquid level of the slag receiving tank 1 does not exceed 50%, feedback is given to the regulating valve 14 and the stop valve 15, the stop valve 15 is opened, and the regulating valve 14 is opened 100%;

[0064] When the liquid level of the slag receiving tank 1 exceeds 50%, feedback is given to the regulating valve 14 and the stop valve 15, the stop valve 15 opens, and the regulating valve 14 opens 55%;

[0065] When the liquid level of the slag receiving tank 1 reaches 60%, it is fed back to the regulating valve 14 and the stop valve 15, the regulating valve 14 is closed, the stop valve 15 is closed, and the slag receiving is ended.

[0066] At the beginning of slurry separation, the outlet of the diatomaceous earth storage mechanism 2 is opened, and under the effect of negative pressure in the drum mechanism, the diatomaceous earth storage mechanism 2 outputs diatomaceous earth to the filter cloth 4 of the drum mechanism, and the filter cloth 4 is pre-coated with diatomaceous earth.

[0067] When the drum 3 is running, under the action of negative pressure in the drum mechanism, the solid silicon powder in the slurry is adsorbed on the filter cloth 4 containing diatomaceous earth to form a solid-liquid mixture.

[0068] like Figure 1 As shown, the scraper driving mechanism 6 drives the scraper 5 to approach the filter cloth 4 to scrape off the solid-liquid mixture on the filter cloth 4, and the scraped solid-liquid mixture is discharged from the slag outlet of the drum mechanism;

[0069] In this embodiment, the process in which the scraper driving mechanism 6 drives the scraper 5 to approach the filter cloth 4 includes:

[0070] The scraper 5 moves forward from the 200 mm scale, and the valve 1 11 and the valve 2 12 are opened. When there is no solid-liquid mixture output from the slag outlet of the drum mechanism, the scraper drive mechanism 6 drives the scraper 5 to approach the filter cloth in 5 mm steps.

[0071] When the solid-liquid mixture is output from the slag outlet of the drum mechanism, the scraper 5 maintains the current position.

[0072] When the scraper 5 moves to the 100 mm mark, the valve 11 is closed, the valve 3 13 is opened, and the scraper drive mechanism 6 drives the scraper 5 away from the filter cloth 3, and the filter cloth 4 is pre-coated with diatomaceous earth again.

[0073] After the pre-coating of diatomaceous earth is completed, valve one 11 is opened, valve three 13 is closed, the scraper driving mechanism 6 drives the scraper 5 to return to the 200 mm scale, and the scraper driving mechanism 6 drives the scraper 5 to approach the filter cloth 4 again.

[0074] In this embodiment, the unit of the scraper feed scale is mm, which can of course be changed adaptively according to specific circumstances.

[0075] Under the effect of negative pressure in the drum mechanism, the liquid mixture in the slurry is vacuum adsorbed to the clear liquid tank 9. The liquid mixture in the slurry is mainly chlorosilane and high boiling substances.

[0076] In this embodiment, when the liquid level of the filter residue tank 8 exceeds 60%, the feedback valve 20 is opened to discharge the solid mixture in the filter residue tank 8 to the hydrolysis tank 17;

[0077] When the liquid level of the filter residue tank 8 reaches 10%, the feedback valve 20 is closed;

[0078] The liquid mixture in the filter residue tank 8 is heated by steam S2, discharged in the form of gas phase, condensed into the condensate tank 18 through the circulating water condenser 19, and the condensed liquid in the condensate tank 18 is adsorbed into the clear liquid tank 9 under the action of the negative pressure in the drum mechanism.

[0079] The solid mixture in the filter residue tank is mainly silicon powder and minerals, which are neutralized with lime water in the hydrolysis tank and then discharged to sewage treatment. The liquid mixture is part of the chlorosilane that has not been completely adsorbed during vacuum adsorption by the vacuum mechanism, and the condensed water C2 after steam heating is directly discharged from the filter residue tank.

[0080] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A slurry device, characterized in that: It includes a diatomaceous earth storage mechanism and a scraper driving mechanism; The outlet of the diatomite storage mechanism is connected to the drum mechanism, and at the beginning of slurry separation or when the scraper advances to a preset distance, the diatomite storage mechanism outputs diatomite to the filter cloth of the drum mechanism under the action of negative pressure in the drum mechanism; The scraper driving mechanism is connected to the scraper to drive the scraper to approach and move away from the filter cloth; It also includes a displacement measuring mechanism, which is installed between the scraper driving mechanism and the scraper, and is used to measure the displacement of the scraper under the drive of the scraper driving mechanism; It also includes a clear liquid tank, wherein a first inlet of the clear liquid tank is connected to a liquid outlet of the drum mechanism, and an outlet of the clear liquid tank is connected to a vacuum mechanism for generating negative pressure in the drum mechanism; It also includes a filter residue tank, a hydrolysis tank and a condensate tank, wherein the filter residue tank has a slag inlet connected to the slag outlet of the drum mechanism, the filter residue tank has a first outlet connected to the inlet of the hydrolysis tank, the filter residue tank has a second outlet connected to the inlet of the condensate tank, and the condensate tank has an outlet connected to the second inlet of the clear liquid tank; It also includes a slag receiving pot, the outlet of which is connected to the slag inlet of the drum mechanism.

2. The slurry device according to claim 1, characterized in that: A valve four is installed between the filter residue tank and the hydrolysis tank, and a circulating water condenser is installed between the filter residue tank and the condensate tank.

3. The slurry device according to claim 1, characterized in that: A valve one is installed between the outlet of the slag receiving tank and the slag inlet of the drum mechanism, a valve two is installed between the slag inlet of the filter slag tank and the slag outlet of the drum mechanism, and a valve three is installed between the outlet of the diatomaceous earth storage mechanism and the slag inlet of the drum mechanism.

4. The slurry device according to claim 1, characterized in that: The inlet of the slag receiving pot is provided with a stop valve, and the other end of the stop valve is connected with the regulating valve.

5. The slurry device according to claim 1, characterized in that: Liquid level gauges for measuring liquid levels are respectively installed in the slag receiving tank and the slag filtering tank.

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