Sodium sulfate solid waste treatment device

Abstract

The utility model relates to the technical field of sodium sulfate solid waste treatment in vitamin C production, in particular to a sodium sulfate solid waste treatment device. The sodium sulfate solid waste treatment device comprises a dissolving kettle, the dissolving kettle is connected with a reaction kettle through a backwashing filter, the reaction kettle is connected with a drying box through a filter, the drying box is connected with a sifter through a pipeline, and the filter is connected with a deamination and denitrification tower through a pipeline. According to the method, solid waste emission is reduced, the environment is improved, and by-products obtained after solid waste treatment are raw materials needed in company production and are reused for production, so that raw material purchase is reduced, the cost is reduced, and good economic benefits, social benefits and environmental protection benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium sulfate solid waste treatment in vitamin C production, in particular to a sodium sulfate solid waste treatment device. Background Art

[0002] The treatment of sodium sulfate solid waste is an important environmental issue in the production process of vitamin C. Since a large amount of sodium sulfate solid waste is generated in the production process of vitamin C, if it is not properly handled, it will cause serious pollution to the environment.

[0003] The existing equipment directly treats it as waste, and produces about 85,000 tons of solid waste sodium sulfate each year, which not only greatly increases the treatment cost, but also causes waste of raw materials. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a sodium sulfate solid waste treatment device, which not only reduces solid waste emissions and improves the environment, but also the by-products after solid waste treatment are the raw materials needed in the company's production and are returned to production. This not only reduces the purchase of raw materials and reduces costs, but also has good economic benefits, social benefits and environmental benefits.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The sodium sulfate solid waste treatment device comprises a dissolving kettle, which is connected to a reactor through a backwash filter, the reactor is connected to a drying box through a filter, the drying box is connected to a sifter through a pipeline, and the filter is connected to a deamination and denitrification tower through a pipeline.

[0007] The filter is used for solid-liquid separation, the solid enters the drying box, and the liquid enters the deamination and denitrification tower.

[0008] The deamination and denitrification tower is connected to the separator through a triple-effect evaporator, the separator is connected to the reactor through a sodium sulfate return pipeline, and an ammonium sulfate discharge pipeline is arranged on the separator.

[0009] The dissolving kettle is provided with a feed inlet and a dissolving liquid inlet pipeline, and the backwashing filter is provided with a flushing water pipeline and an impurity discharge port.

[0010] A pipeline for entering the reactor is connected between the backwash filter and the reactor, the deamination and denitrification tower is connected to the ammonium carbonate synthesis tower through a pipeline, and the ammonium carbonate synthesis tower is connected to the pipeline for entering the reactor through an ammonium bicarbonate return pipeline.

[0011] The reactor is provided with a stirrer inside, the filter is provided with a filter plate inside, and the filter plate is provided with filter holes.

[0012] The connection between the drying box and the filter is located above the filter plate, and the connection between the deamination and denitrification tower and the filter is located below the filter plate.

[0013] The sodium sulfate residue produced during the VC production process is transported to the silo by a feeder, and then transported to the metering tank by a belt conveyor. Add water to the metering tank in a certain proportion, use a material delivery pump to pump sodium sulfate and water into the dissolving kettle for dissolution for 2 hours (steam heating temperature is 60°C), enter the filter to filter out the sodium gulonate residue, and then pour the filtered sodium sulfate solution into the buffer tank for temporary storage. Add the purchased ammonium bicarbonate and the filtered sodium sulfate solution into the reactor, keep the temperature at 36°C, delay for 30 minutes, filter after the reaction is completed, dry the filtered solid material through a drying box, screen it with a sifter, and produce baking soda for packaging and storage; the filtered liquid material is removed by a deamination and denitrification tower to remove ammonia and carbon dioxide, and the produced ammonia and carbon dioxide are sent to the carbon ammonium synthesis tower to produce ammonium bicarbonate, which is reused in the reactor. The liquid material after deamination and decarbonization is precipitated with sodium sulfate and ammonium sulfate through a three-effect evaporator and a separator. All sodium sulfate is reused in the reactor, and ammonium sulfate is packaged and stored.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The use of the sodium sulfate solid waste treatment device of the utility model not only reduces solid waste emissions and improves the environment, but also the by-products after solid waste treatment are the raw materials needed in the company's production and are returned to production. This not only reduces the purchase of raw materials and reduces costs, but also has good economic benefits, social benefits and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the sodium sulfate solid waste treatment device of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the filter plate of the utility model;

[0018] In the figure: 1. dissolving kettle; 2. backwash filter; 3. reactor; 4. filter; 5. drying box; 6. sifter; 7. deamination and denitrification tower; 8. ammonium carbonate synthesis tower; 9. triple-effect evaporator; 10. separator; 11. feed port; 12. dissolving liquid inlet pipeline; 13. agitator; 14. filter plate; 15. ammonium bicarbonate return pipeline; 16. reactor inlet pipeline; 17. ammonium sulfate discharge pipeline; 18. sodium sulfate return pipeline; 19. filter hole; 20. flushing water pipeline; 21. impurity discharge port. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] Example 1

[0021] like Figure 1 As shown, the sodium sulfate solid waste treatment device includes a dissolving kettle 1, which is connected to the reactor 3 through a backwash filter 2, and the reactor 3 is connected to the drying box 5 through a filter 4, and the drying box 5 is connected to the sifter 6 through a pipeline, and the filter 4 is connected to the deamination and denitrification tower 7 through a pipeline. The filter 4 is used for solid-liquid separation, the solid enters the drying box 5, and the liquid enters the deamination and denitrification tower 7. The deamination and denitrification tower 7 is connected to the separator 10 through a triple-effect evaporator 9, and the separator 10 is connected to the reactor 3 through a sodium sulfate return pipeline 18, and the separator 10 is provided with an ammonium sulfate discharge pipeline 17. The dissolving kettle 1 is provided with a feed port 11 and a dissolving liquid inlet pipeline 12, and the backwash filter 2 is provided with a flushing water pipeline 20 and an impurity discharge port 21. A pipeline 16 for entering the reactor is connected between the backwash filter 2 and the reactor 3, and the deamination and denitrification tower 7 is connected to the carbon ammonium synthesis tower 8 through a pipeline, and the carbon ammonium synthesis tower 8 is connected to the pipeline 16 for entering the reactor through an ammonium bicarbonate return pipeline 15. The reactor 3 is provided with an agitator 13 inside, the filter 4 is provided with a filter plate 14 inside, and the filter plate 14 is provided with filter holes 19. The connection between the drying box 5 and the filter 4 is located above the filter plate 14, and the connection between the deamination and denitrification tower 7 and the filter 4 is located below the filter plate 14.

[0022] The above-mentioned sodium sulfate solid waste treatment device, when in operation, comprises the following steps:

[0023] (1) The sodium sulfate residue produced during the VC production process is transported to the silo via a feeder, and then transported to the metering tank via a belt conveyor. Water is added to the metering tank in a certain proportion, and the sodium sulfate and water are pumped into the dissolution kettle 1 by a material delivery pump to dissolve for 2 hours. The sodium chlorate residue is filtered out by the filter 4, and the filtered sodium sulfate solution is temporarily stored; (2) The purchased ammonium bicarbonate and the filtered sodium sulfate solution are added to the reactor 3, maintained at a temperature of 36°C, delayed for 30 minutes, and filtered after the reaction is completed. The filtered solid material is dried by a drying box 5 and screened by a sifter 6, and the produced baking soda is packaged and stored; (3) The filtered liquid material is passed through a deamination and denitrification tower 7 to remove ammonia and carbon dioxide. The produced ammonia and carbon dioxide are sent to the carbon ammonium synthesis tower 8 to produce ammonium bicarbonate, which is then recycled to the reactor 3. The liquid material after deamination and decarbonization is passed through a three-effect evaporator 9 and a separator 10 to precipitate sodium sulfate and ammonium sulfate. All sodium sulfate is recycled to the reactor 3, and the ammonium sulfate is packaged and stored.

Claims

1. A sodium sulfate solid waste treatment device, characterized in that: The invention comprises a dissolving kettle (1), wherein the dissolving kettle (1) is connected to a reaction kettle (3) via a backwashing filter (2), the reaction kettle (3) is connected to a drying box (5) via a filter (4), the drying box (5) is connected to a sifter (6) via a pipeline, and the filter (4) is connected to a deamination and denitrification tower (7) via a pipeline.

2. The sodium sulfate solid waste treatment device according to claim 1, characterized in that: The deamination and denitrification tower (7) is connected to a separator (10) via a triple-effect evaporator (9), the separator (10) is connected to a reaction kettle (3) via a sodium sulfate return pipeline (18), and an ammonium sulfate discharge pipeline (17) is provided on the separator (10).

3. The sodium sulfate solid waste treatment device according to claim 1, characterized in that: The dissolving kettle (1) is provided with a feed inlet (11) and a dissolving liquid inlet pipeline (12), and the backwashing filter (2) is provided with a flushing water pipeline (20) and an impurity discharge port (21).

4. The sodium sulfate solid waste treatment device according to claim 1, characterized in that: A pipeline (16) for entering the reactor is connected between the backwash filter (2) and the reactor (3); the deamination and denitrification tower (7) is connected to the ammonium carbonate synthesis tower (8) through a pipeline; and the ammonium carbonate synthesis tower (8) is connected to the pipeline (16) for entering the reactor through an ammonium bicarbonate return pipeline (15).

5. The sodium sulfate solid waste treatment device according to claim 1, characterized in that: The reactor (3) is provided with a stirrer (13) inside, the filter (4) is provided with a filter plate (14) inside, and the filter plate (14) is provided with filter holes (19).

6. The sodium sulfate solid waste treatment device according to claim 5, characterized in that: The connection between the drying box (5) and the filter (4) is located above the filter plate (14), and the connection between the deamination and denitrification tower (7) and the filter (4) is located below the filter plate (14).

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