System for treating nano calcium carbonate production sewage

Abstract

The utility model discloses a nano calcium carbonate production sewage treatment system which comprises a lime kiln, a tail gas outlet of the lime kiln is connected with an inlet of a synthesis kettle through a tail gas fan and a compressor, and an outlet of the synthesis kettle is connected with a sewage pool through an acid supply pipe. The device disclosed by the utility model has the beneficial effects that (1) when the production sewage of the nano calcium carbonate is treated, no additional acidic material is needed, so that the production cost is reduced, and meanwhile, the potential safety hazard in the acid feeding process is also eliminated; and (2) the kiln gas generated in the production of nano calcium carbonate is used for treating production sewage and does not need to be directly discharged into the atmosphere, so that the carbon emission is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a system for treating sewage produced by nano-calcium carbonate. Background Art

[0002] The pH of wastewater from nano-calcium carbonate production is around 10, making it alkaline and not suitable for biochemical treatment. Currently, it can only be neutralized by adding acidic substances, which increases production costs and raises safety risks during the acid addition process. During the nano-calcium carbonate production process, lime kiln gas, primarily carbon dioxide, is used in the synthesis reaction. However, unreacted gas is directly discharged through the chimney, which does not comply with China's current carbon neutrality policy. Summary of the Invention

[0003] In response to the above-mentioned problems in the prior art, the utility model provides a system for treating wastewater from the production of nano-calcium carbonate, the technical solution of which is as follows: it includes a lime kiln, the exhaust gas outlet of the lime kiln is connected to the inlet of the synthesis kettle through an exhaust gas fan and a compressor, and the outlet of the synthesis kettle is connected to the sewage pool through an acid supply pipe.

[0004] As a preferred solution, a cyclone dust collector is provided between the compressor and the synthesis reactor, and a pneumatic valve is provided in front of the inlet of the cyclone dust collector.

[0005] As a preferred solution, a plurality of acid supply branches are provided on the acid supply pipe, and the acid supply branches are uniformly inserted into the sewage pool.

[0006] As a preferred solution, a pH sensor is provided on the sewage pool, and the pH sensor is interlocked with the pneumatic valve.

[0007] Beneficial effects of the utility model:

[0008] (1) When treating wastewater produced by nano-calcium carbonate, no additional acidic substances need to be added, which reduces production costs and eliminates safety hazards during the acid addition process;

[0009] (2) The kiln gas generated in the production of nano calcium carbonate is used to treat production wastewater without being discharged directly into the atmosphere, thus reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0011] In the figure: 1. Lime kiln; 2. Exhaust gas fan; 3. Compressor; 4. Pneumatic valve; 5. Cyclone dust collector; 6. Synthesis kettle; 7. Acid supply pipe; 701. Acid supply branch pipe; 8. Sewage tank; 9. pH sensor. DETAILED DESCRIPTION

[0012] The present invention will be described in further detail below based on the accompanying drawings and specific embodiments.

[0013] Example

[0014] like Figure 1 The system shown is for treating wastewater from the production of nano-calcium carbonate, comprising a lime kiln 1, the tail gas outlet of the lime kiln 1 being connected to the inlet of a synthesis reactor 6 via a tail gas blower 2 and a compressor 3, and the outlet of the synthesis reactor 6 being connected to a sewage pool 8 via an acid supply pipe 7.

[0015] Furthermore, a cyclone dust collector 5 is provided between the compressor 3 and the synthesis reactor 6, and a pneumatic valve 4 is provided before the inlet of the cyclone dust collector 5. The cyclone dust collector 5 is used to remove solid particles in the kiln gas and reduce the particle ratio in the subsequent carbonic acid.

[0016] Furthermore, a plurality of acid supply branches 701 are provided on the acid supply pipe 7 , and the acid supply branches 701 are uniformly inserted into the sewage pool 8 , so that carbonic acid is uniformly introduced into the production sewage to quickly reduce the pH value.

[0017] Furthermore, a pH sensor 9 is provided on the sewage pool 8, and the pH sensor 9 is interlocked with the pneumatic valve 4. The initial pH value of the sewage is 10, and the allowable discharge value is 6-9. The pH sensor is used to monitor the acidity and alkalinity of the sewage.

[0018] The above system operates as follows: the exhaust gas generated in the lime kiln 1 is passed through the exhaust fan 2 and the compressor 3 into the cyclone dust collector 4 for dust removal to reduce the particle ratio in the subsequent carbonic acid. The exhaust gas after compression and dust removal is passed into the synthesis reactor 6 for hydration reaction with water to generate carbonic acid. The carbonic acid is passed into the sewage pool 8 through the acid supply branch pipe 701 in the acid supply pipe 7 for acid-base neutralization to reduce the pH value of the sewage. After the pH value of the sewage reaches the dischargeable value, it is discharged into the next treatment process. At the same time, the pneumatic valve 4 is closed. After the new sewage enters the sewage pool and the pH value is higher than the dischargeable value, the pneumatic valve 4 is opened to continue synthesizing carbonic acid for neutralizing the sewage used in sodium carbonate production.

Claims

1. A system for treating wastewater from the production of nano-calcium carbonate, comprising a lime kiln (1), characterized in that: The tail gas outlet of the lime kiln (1) is connected to the inlet of the synthesis kettle (6) through the tail gas fan (2) and the compressor (3), and the outlet of the synthesis kettle (6) is connected to the sewage pool (8) through the acid supply pipe (7).

2. A system for treating wastewater produced by nano-calcium carbonate according to claim 1, characterized in that: A cyclone dust collector (5) is provided between the compressor (3) and the synthesis reactor (6), and a pneumatic valve (4) is provided in front of the inlet of the cyclone dust collector (5).

3. A system for treating wastewater produced by nano-calcium carbonate according to claim 1, characterized in that: A plurality of acid supply branch pipes (701) are provided on the acid supply pipe (7), and the acid supply branch pipes (701) are uniformly inserted into the interior of the sewage pool (8).

4. A system for treating wastewater produced by nano-calcium carbonate according to claim 1, characterized in that: The sewage pool (8) is provided with a pH sensor (9), which is interlocked with the pneumatic valve (4).

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