Efficient neutralization and resource utilization method of industrial waste acid

Abstract

The invention relates to an efficient neutralization and resource utilization method of industrial waste acid, which comprises the following steps: homogenizing and stirring at the stirring speed of not more than 20r / min, providing a homogenizing and stirring environment of 35-45 DEG C, and stirring and primary heating for 20-25min; the stirring speed is not smaller than 35 r / min, a neutralization environment at the temperature of 70-75 DEG C is provided, neutralized powder is discharged from one of a first powder outlet and a second powder outlet, the neutralization primary stirring time is 30-40 min, and the powder output is not smaller than 150 g / min; neutralizing secondary stirring is conducted, the stirring speed is not smaller than 40 r / min, a neutralizing environment at the temperature of 75-80 DEG C is provided, the other one of the first powder outlet and the second powder outlet is used for discharging neutralized powder synchronously, the neutralizing primary stirring time is 20-25 min, and the powder output is not smaller than 200 g / min; and the stirring module rises and stands for 5-10 min, then the wastewater flows out after being neutralized by the wastewater outflow port, and the filter plate receives the neutralized precipitate.

Description

Technical Field

[0001] The invention relates to environmental protection technology and equipment for using the same, and in particular to a method for highly efficient neutralization and resource utilization of industrial waste acid. Background Art

[0002] Industrial waste acid generally refers to waste sulfuric acid, which is produced in industrial production in the nitration, esterification, sulfonation, alkylation, catalysis and gas drying processes of organic matter, or in the production of titanium dioxide, steel pickling and gas drying processes. Industrial waste acid concentration is generally low, impurity content is high, and most of them contain organic matter, making it difficult to use directly.

[0003] Therefore, it is necessary to provide a method for efficiently neutralizing and recycling industrial waste acid to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a method for efficiently neutralizing and recycling industrial waste acid.

[0005] The technical solution is as follows:

[0006] A method for efficiently neutralizing and recycling industrial waste acid, comprising the following steps:

[0007] 1) a neutralization tank is provided, and a stirring module is provided in the neutralization tank, wherein the stirring module comprises a stirring body, a stirring part is provided in the middle of the stirring body, and corresponding to the stirring part, a plurality of layers of heating bodies are provided on the stirring body and surrounding the stirring part;

[0008] 2) A plurality of neutralization material outlets are provided on the stirring part, and the corresponding neutralization material outlets are connected to the neutralization material box, and a battery valve is provided to control the on-off; the plurality of neutralization material outlets only include a first powder outlet and a second powder outlet, the first powder outlet is used for supplying limestone and dolomite powder, and the second powder outlet is used for supplying sodium hydroxide and sodium carbonate powder;

[0009] 3) A filter plate is arranged at the bottom of the neutralization tank, and the filter plate is arranged at the outlet of the treated wastewater;

[0010] 4) Industrial wastewater flows into the neutralization tank through the waste acid inlet, the stirring module descends, and the stirring part performs homogenous stirring at a stirring speed of no more than 20r / min. Synchronously, one layer and two layers of the heating bodies are selected for primary heating to provide a homogenized stirring environment of 35-45°C. The stirring and primary heating time is 20-25min;

[0011] 5) The stirring part continues to stir, which is called neutralization primary stirring, and the stirring speed is not less than 35r / min. Simultaneously, all the layers of heating bodies are heated, which is called secondary heating, providing a neutralization environment of 70-75°C. Simultaneously, one of the first powder outlet and the second powder outlet discharges the neutralized powder. The neutralization primary stirring time is 30-40min, and the powder output is not less than 150g / min.

[0012] 6) The stirring part continues to stir, which is called secondary stirring for neutralization. The stirring speed is not less than 40r / min. Synchronously, all the layers of heating bodies are heated, which is called secondary heating, providing a neutralization environment of 75-80°C. Synchronously, the first powder outlet and the second powder outlet are used to discharge the neutralized powder. The neutralization stirring time is 20-25min, and the powder output is not less than 200g / min.

[0013] 7) The stirring module rises and stands for 5-10 minutes. The wastewater is then neutralized and flows out from the wastewater outlet. The filter plate receives the neutralized sediment.

[0014] Furthermore, in step 5), the stirring speed of the neutralization stirring is 45-55 r / min.

[0015] Furthermore, in step 5), the stirring speed of the neutralization stirring is 50 r / min.

[0016] Furthermore, in step 6), the stirring speed of the neutralization secondary stirring is 55-65 r / min.

[0017] Furthermore, in step 6), the stirring speed of the neutralization secondary stirring is 60 r / min.

[0018] Furthermore, the bottom of the neutralization tank is funnel-shaped, and the filter plate is located at the lowest point of the bottom of the funnel-shaped neutralization tank.

[0019] Furthermore, filter holes are evenly formed on the filter plate, and the diameter of the filter holes is no more than 2 mm.

[0020] Furthermore, a switch plate is provided on the wastewater outlet.

[0021] Compared with the prior art, the present invention achieves high-quality neutralization and resource utilization of industrial wastewater through the coordination of homogenous stirring, primary neutralization stirring and secondary neutralization stirring. The homogenous stirring, primary neutralization stirring and secondary neutralization stirring provide corresponding temperatures, and the primary neutralization stirring and secondary neutralization stirring are used to feed neutralization powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0023] Example:

[0024] See also Figure 1 This embodiment shows a method for efficient neutralization and resource utilization of industrial waste acid, the steps comprising:

[0025] 1) A neutralization tank 1 is provided, and a stirring module 2 is provided on the neutralization tank 1. The stirring module 2 includes a stirring body 21, a stirring portion 22 is provided in the middle of the stirring body 21, and corresponding to the stirring portion 22, a plurality of layers of heating bodies 23 are provided on the stirring body surrounding the stirring portion;

[0026] 2) A plurality of neutralization material outlets 24 are provided on the stirring part 22, and the corresponding neutralization material outlets are connected to the neutralization material box, and a battery valve is provided to control the on-off; the plurality of neutralization material outlets only include a first powder outlet and a second powder outlet, the first powder outlet is used for supplying limestone and dolomite powder, and the second powder outlet is used for supplying sodium hydroxide and sodium carbonate powder;

[0027] 3) A filter plate 3 is arranged at the bottom of the neutralization tank 1, and the filter plate 3 is arranged on the treated wastewater outflow outlet 4;

[0028] 4) Industrial wastewater flows into the neutralization tank 2 through the waste acid inlet, the stirring module 2 descends, and the stirring part 22 performs homogenous stirring at a stirring speed of no more than 20r / min. Simultaneously, one or two layers of the plurality of layers of heating bodies 23 are selected for primary heating to provide a homogenized stirring environment of 35-45°C, and the stirring and primary heating time is 20-25min;

[0029] 5) The stirring part 22 continues to stir, which is called neutralization primary stirring, and the stirring speed is not less than 35r / min. Simultaneously, all the layers of heating bodies 23 are heated, which is called secondary heating, providing a neutralization environment of 70-75°C. Simultaneously, one of the first powder outlet and the second powder outlet discharges the neutralized powder. The neutralization primary stirring time is 30-40min, and the powder output is not less than 150g / min.

[0030] 6) The stirring part 22 continues stirring, which is called secondary stirring for neutralization. The stirring speed is not less than 40r / min. Simultaneously, all the layers of heating bodies 23 are heated, which is called secondary heating, providing a neutralization environment of 75-80°C. Simultaneously, the first powder outlet and the second powder outlet are used to discharge the neutralized powder. The neutralization stirring time is 20-25min, and the powder output is not less than 200g / min.

[0031] 7) The stirring module 2 is raised and left to stand for 5-10 minutes, and then the wastewater flows out through the wastewater outlet 4 after neutralization, and the filter plate receives the sediment after neutralization.

[0032] In step 5), the stirring speed during the neutralization is 45-55 r / min.

[0033] In step 5), the stirring speed during the neutralization stirring is 50 r / min.

[0034] In step 6), the stirring speed of the neutralization and secondary stirring is 55-65 r / min.

[0035] In step 6), the stirring speed of the neutralization secondary stirring is 60 r / min.

[0036] The bottom of the neutralization tank 1 is funnel-shaped, and the filter plate is located at the lowest point of the bottom of the funnel-shaped neutralization tank.

[0037] The filter plate 3 is evenly provided with filter holes, and the diameter of the filter holes is no more than 2 mm.

[0038] A switch plate 41 is provided on the wastewater outflow outlet 4 .

[0039] Compared with the prior art, the present invention achieves high-quality neutralization and resource utilization of industrial wastewater through the coordination of homogenous stirring, primary neutralization stirring and secondary neutralization stirring. The homogenous stirring, primary neutralization stirring and secondary neutralization stirring provide corresponding temperatures, and the primary neutralization stirring and secondary neutralization stirring are used to feed neutralization powder.

[0040] For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, all of which fall within the protection scope of the present invention.

Claims

1. A method for efficiently neutralizing and recycling industrial waste acid, characterized in that: include: 1) a neutralization tank is provided, and a stirring module is provided in the neutralization tank, wherein the stirring module comprises a stirring body, a stirring part is provided in the middle of the stirring body, and corresponding to the stirring part, a plurality of layers of heating bodies are provided on the stirring body and surrounding the stirring part; 2) A plurality of neutralization material outlets are provided on the stirring part, and the corresponding neutralization material outlets are connected to the neutralization material box, and a battery valve is provided to control the on-off; the plurality of neutralization material outlets only include a first powder outlet and a second powder outlet, the first powder outlet is used for supplying limestone and dolomite powder, and the second powder outlet is used for supplying sodium hydroxide and sodium carbonate powder; 3) A filter plate is arranged at the bottom of the neutralization tank, and the filter plate is arranged at the outlet of the treated wastewater; 4) Industrial wastewater flows into the neutralization tank through the waste acid inlet, the stirring module descends, and the stirring part performs homogenous stirring at a stirring speed of no more than 20r / min. Synchronously, one layer and two layers of the heating bodies are selected for primary heating to provide a homogenized stirring environment of 35-45°C. The stirring and primary heating time is 20-25min; 5) The stirring part continues to stir, which is called neutralization primary stirring, and the stirring speed is not less than 35r / min. Simultaneously, all the layers of heating bodies are heated, which is called secondary heating, providing a neutralization environment of 70-75°C. Simultaneously, one of the first powder outlet and the second powder outlet discharges the neutralized powder. The neutralization primary stirring time is 30-40min, and the powder output is not less than 150g / min. 6) The stirring part continues to stir, which is called secondary stirring for neutralization. The stirring speed is not less than 40r / min. Synchronously, all the layers of heating bodies are heated, which is called secondary heating, providing a neutralization environment of 75-80°C. Synchronously, the first powder outlet and the second powder outlet are used to discharge the neutralized powder. The neutralization stirring time is 20-25min, and the powder output is not less than 200g / min. 7) The stirring module rises and stands for 5-10 minutes. The wastewater is then neutralized and flows out from the wastewater outlet. The filter plate receives the neutralized sediment.

2. The method for efficient neutralization and resource utilization of industrial waste acid according to claim 1, characterized in that: In step 5), the stirring speed during the neutralization is 45-55 r / min.

3. The method for efficient neutralization and resource utilization of industrial waste acid according to claim 2, characterized in that: In step 5), the stirring speed during the neutralization stirring is 50 r / min.

4. The method for highly efficient neutralization and resource utilization of industrial waste acid according to claim 3, characterized in that: In step 6), the stirring speed of the neutralization and secondary stirring is 55-65r / min.

5. The method for highly efficient neutralization and resource utilization of industrial waste acid according to claim 4, characterized in that: In step 6), the stirring speed of the neutralization secondary stirring is 60 r / min.

6. The method for highly efficient neutralization and resource utilization of industrial waste acid according to claim 5, characterized in that: The bottom of the neutralization tank is funnel-shaped, and the filter plate is located at the lowest point of the bottom of the funnel-shaped neutralization tank.

7. The method for efficient neutralization and resource utilization of industrial waste acid according to claim 6, characterized in that: The filter plate is evenly provided with filter holes, and the diameter of the filter holes is no more than 2 mm.

8. The method for highly efficient neutralization and resource utilization of industrial waste acid according to claim 7, characterized in that: A switch plate is provided on the wastewater outflow outlet.

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