CN213265754U - Purification device for sodium sulfate in cold-rolled strip steel annealing and pickling line unit - Google Patents
Purification device for sodium sulfate in cold-rolled strip steel annealing and pickling line unit Download PDFInfo
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- CN213265754U CN213265754U CN202022073220.0U CN202022073220U CN213265754U CN 213265754 U CN213265754 U CN 213265754U CN 202022073220 U CN202022073220 U CN 202022073220U CN 213265754 U CN213265754 U CN 213265754U
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Abstract
The utility model provides a sodium sulfate purification device in a cold-rolled strip steel annealing and pickling line unit. The purification device comprises: the system comprises a filter press, a settling tank, a neutral salt storage tank, a pH adjusting tank, a reduction tank, a precipitation reaction tank and a final reaction tank; the neutral salt storage tank is communicated with the pH adjusting tank, the pH adjusting tank is communicated with the reducing tank, the reducing tank is communicated with the precipitation reaction tank, the filter press and the precipitation tank form a loop, the precipitation tank is communicated with the final reaction tank, the final reaction tank is communicated with the neutral salt storage tank, and the precipitation tank is communicated with the precipitation reaction tank; the reduction pot is provided with NaHSO3A medicine adding port, wherein the precipitation reaction tank is provided with a NaOH medicine adding port; pH adjusting tank, reduction tank, precipitation reaction tank and final reactionThe tanks are all provided with aeration equipment. The utility model discloses Na in the cold-rolled strip steel annealing and pickling line unit2SO4The purification apparatus of (1), capable of removing Gr in neutral salt6+The quality defects caused by the NP process section are eliminated.
Description
Technical Field
The utility model relates to a purifier especially relates to a Na among cold-rolled steel strip annealing pickling line unit2SO4The purifying device belongs to the technical field of steel rolling.
Background
NP(Na2SO4 Purification；Na2SO4Purification) system is the key of quality control of the stainless steel products of the cold-rolled strip steel annealing and pickling line unit, and if the NP system is abnormal or stops running, the quality defects of sludge pollution and the like can be generated on the products of the cold-rolled strip steel annealing and pickling line unit.
After the NP system operates for many years, the effect is not ideal, the neutral salt treated by the NP system cannot meet the use requirement of a subsequent process section, and Gr in the neutral salt6+Cannot be purified from neutral salts.
Currently, NaHSO is not reasonable due to the existing NP process section design3And H2SO4Meanwhile, after the pH adjusting tank is added into a reaction tank of the pH adjusting tank, a pH measuring probe and an ORP probe (oxidation-reduction potential electrode) of the pH adjusting tank are interfered, so that measured data are distorted. The stirrers of the reaction tanks of the pH adjusting tank, the reduction tank and the final reaction tank cannot fully stir the medicines in the reaction tank, and the reaction tank has stirring dead angles after the stirrers are started.
Therefore, it is one of the problems to be solved in the art to provide an NP system that can effectively handle neutral salts and provide a more sufficient reaction.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, it is an object of the present invention to provide NP (Na) which can effectively treat neutral salt and can more sufficiently react2SO4Purification) device.
In order to realize the technical purpose, the utility model provides a cold-rolled strip steel annealing and pickling lineSodium sulfate (Na) in unit (CAPL)2SO4) The purification device is Na in the cold-rolled strip steel annealing and pickling line unit2SO4The purification apparatus of (1) comprises: the system comprises a filter press, a settling tank, a neutral salt storage tank, a pH adjusting tank, a reduction tank, a precipitation reaction tank and a final reaction tank; wherein the content of the first and second substances,
the neutral salt storage tank is communicated with the pH adjusting tank, the pH adjusting tank is communicated with the reducing tank, the reducing tank is communicated with the precipitation reaction tank, the filter press and the precipitation tank form a loop, the precipitation tank is communicated with the final reaction tank, the final reaction tank is communicated with the neutral salt storage tank, and the precipitation tank is communicated with the precipitation reaction tank;
the reduction pot is provided with NaHSO3A medicine adding port, wherein the precipitation reaction tank is provided with a NaOH medicine adding port;
the pH adjusting tank, the reduction tank, the precipitation reaction tank and the final reaction tank are respectively provided with aeration equipment.
The utility model discloses an among the purifier, with NaHSO3The addition position of (2) was adjusted from a pH adjusting tank (CRT1) to a reducing tank (CRT2) to ensure Na2SO4After the pH of the solution is adjusted in the pH adjusting tank, the solution enters a reduction tank for reaction, so that the reaction is more sufficient, and the use amount of a medicament is reduced; the addition position of NaOH was adjusted from the reduction tank (CRT2) to the precipitation reaction tank (CRT3) to ensure Na2SO4The solution is mixed with NaHSO in a reduction tank3The reaction is fully carried out, and then the reaction is carried out with NaOH in a precipitation reaction tank, so that the reaction is more fully carried out, and the dosage of the medicament is also reduced.
The utility model discloses Na in the cold-rolled strip steel annealing and pickling line unit2SO4All the containers in the purification apparatus of (1) were containers made of 316L stainless steel.
In a specific embodiment of the present invention, the aeration device comprises an extension pipe and a gas outlet part communicated with the extension pipe, wherein the gas outlet part comprises at least 4 gas outlets. The air outlet part comprises an air outlet pipe and an air conveying pipe communicated with the extension pipe, wherein the air conveying pipe is used for conveying air in the extension pipe to the air outlet pipe. The gas transmission pipe can be a loop formed by sequentially connecting 4 vent pipes end to end, and the joint of every two vent pipes is provided with a gas outlet pipe. The gas delivery pipe can also be a vent pipe with any shape, such as a rectangular vent pipe, a square vent pipe or a round vent pipe, and the gas outlet pipes are uniformly distributed on each part of the vent pipe; or, the gas pipe can also be a loop with any shape formed by sequentially communicating more than two vent pipes end to end, for example, a rectangular channel formed by sequentially communicating four vent pipes end to end, and the joint of every two vent pipes is provided with at least one gas outlet pipe.
In a specific embodiment of the present invention, the outlet of the outlet duct faces the bottom of the treatment tank.
In one embodiment of the present invention, the outlet duct has a length of 5cm to 10 cm.
In a specific embodiment of the present invention, the aeration device is provided with a control valve for controlling the circulation of gas. For example, the control valve may be provided at the inlet end of the extension pipe.
In a specific embodiment of the present invention, the final reaction tank is provided with H2SO4A dosing port, and a final reaction tank is provided with a NaOH dosing port. The pH adjusting tank is provided with H2SO4And a medicine adding port.
Furthermore, the purification device also comprises a sodium bisulfite tank, a sulfuric acid tank and a sodium hydroxide tank. Wherein, the sodium bisulfite tank is communicated with the reduction tank, the sulfuric acid tank is respectively communicated with the pH adjusting tank and the final reaction tank, and the sodium hydroxide tank is respectively communicated with the final reaction tank and the precipitation reaction tank.
In a specific embodiment of the utility model, the pH adjusting tank, the reduction tank, the precipitation reaction tank and the final reaction tank are provided with the metering valve on the pipeline of the chemical adding port end. The electronic metering valve for setting the medicine flow is set on the connecting pipe between the medicine tank and the treating tank to control the medicine speed and make the medicine add in homogeneously and quantitatively.
The utility model discloses an among the above-mentioned cold-rolled strip steel annealing pickling line unit Na2SO4Is particularly used for purifying Na2SO4The method comprises the following steps:
when the neutral salt solution of the production line (in solution)Comprising H2CrO4And Na2SO4) After the neutral salt enters the pH adjusting tank from the neutral salt storage tank, H is started2SO4Quantitative electronic valve for H in sulfuric acid tank2SO4Adding the mixture into a pH adjusting tank at a constant speed, and adjusting the flow of a quantitative electronic valve in time according to online pH monitoring data to ensure that the pH is about 3 so as to ensure that the mixture enters a reduction tank and can fully generate reduction reaction;
after the neutral salt solution in the pH adjusting tank overflows to the reduction tank, the NaHSO is opened3Quantitative electronic valve, NaHSO3The sodium hydrogen sulfite is fed into a reduction tank, NaHSO3And Na2SO4And residual H in the production of strip steel2CrO4And carrying out reduction reaction.
After the neutral salt solution in the reduction tank overflows to the precipitation reaction tank, a NaOH quantitative electronic valve is opened to enable NaOH to enter the precipitation reaction tank from a sodium hydroxide tank, the flow of the quantitative electronic valve is adjusted in time according to online pH monitoring data to ensure that the pH is 7.5-8.5 and the neutral salt and NaHSO are ensured3And (4) fully reacting.
After the precipitation reaction tank reaches the set liquid level, a conveying pump is started, neutral salt in the precipitation reaction tank is conveyed to the precipitation tank, precipitated substances in the neutral salt naturally precipitate in the precipitation tank, a diaphragm pump is connected to the bottom of the precipitation tank, and the precipitate at the bottom of the precipitation tank is conveyed to a filter press through the diaphragm pump to filter the neutral salt so as to remove the mixture containing toxic hexavalent chromium.
Overflowing the clean neutral salt solution in the precipitation tank and the clean neutral salt solution filtered by the filter press to a final reaction tank, opening a NaOH quantitative electronic valve and H2SO4Quantitative electronic valve for NaOH in sodium hydroxide tank and H in sulfuric acid tank2SO4And (3) entering a final reaction tank, adjusting the flow of a quantitative electronic valve in time according to online pH monitoring data to ensure that the pH is 4-5, and conveying the neutralized clean neutral salt to a neutral salt storage tank by a pump of the final reaction tank for generation and use.
The utility model discloses Na in the cold-rolled strip steel annealing and pickling line unit2SO4The purification device realizes that the aeration addition amount is adjusted according to the actual condition of each treatment tank by arranging the aeration equipment in the pH adjusting tank, the reduction tank, the precipitation reaction tank and the final reaction tank, so that the medicament and the neutral salt are fully reacted, the reaction is more sufficient, and no dead angle exists.
The utility model discloses Na in the cold-rolled strip steel annealing and pickling line unit2SO4The purification device adopts the tank made of 316L stainless steel, avoids the occurrence of the conditions that the welding seam position of the tank body is cracked, the shape of the internal baffle plate falls off and the like when the change of the existing PPH material is large due to expansion with heat and contraction with cold, and greatly improves the running stability of the device.
The utility model discloses Na in the cold-rolled strip steel annealing and pickling line unit2SO4The purification device realizes Na2SO4The neutral salt treated by the purification device can meet the use requirement of the subsequent process section and remove Gr in the neutral salt6+The quality defects caused by the NP process section are eliminated.
Drawings
FIG. 1 shows Na in the annealing and pickling line set for cold-rolled steel strip of example 12SO4Schematic structural diagram of the purification device of (1).
FIG. 2 shows Na in the annealing and pickling line set for cold-rolled steel strip of example 12SO4The structure of the aeration equipment of the purification apparatus of (1) is schematically shown.
Description of the main figures:
1. a filter press; 2. a settling tank; 3. a neutral salt storage tank; 4. a pH adjusting tank; 5. a reduction tank; 6. a precipitation reaction tank; 7. a final reaction tank; 8. a sodium bisulfite tank; 9. a sulfuric acid tank; 10. a sodium hydroxide tank; 11. an extension pipe; 12. a gas delivery pipe; 13. and an air outlet pipe.
Detailed Description
For a clearer understanding of the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention is given, but the present invention is not limited to the applicable scope.
Example 1
The embodiment provides Na in a cold-rolled strip steel annealing and pickling line unit (CAPL)2SO4The purification apparatus of (1).
As shown in figure 1, Na is arranged in the cold-rolled strip steel annealing and pickling line unit2SO4The purification apparatus of (1) comprises: the device comprises a filter press 1, a precipitation tank 2, a neutral salt storage tank 3, a pH adjusting tank 4, a reduction tank 5, a precipitation reaction tank 6, a final reaction tank 7, a sodium bisulfite tank 8, a sulfuric acid tank 9 and a sodium hydroxide tank 10.
Wherein, neutral salt holding vessel 3 communicates with pH adjusting tank 4, pH adjusting tank 4 communicates with reducing tank 5, reducing tank 5 communicates with precipitation reaction jar 6, pressure filter 1 constitutes the return circuit with settling tank 2, settling tank 2 communicates with final retort 7, final reaction jar 7 communicates with neutral salt holding vessel 3, settling tank 2 communicates with precipitation reaction jar 3, sodium bisulfite jar 8 communicates with reducing tank 5, sulfuric acid jar 9 communicates with pH adjusting tank 4 and final reaction jar 7 respectively, sodium hydroxide jar 10 communicates with final reaction jar 7 and precipitation reaction jar 6 respectively.
Wherein the reduction tank 5 is provided with NaHSO3A dosing port for adding NaHSO3(ii) a The precipitation reaction tank 6 is provided with a NaOH dosing port for adding NaOH; the final reaction tank 7 is provided with H2SO4A dosing port for adding H2SO4(ii) a The final reaction tank 7 is provided with a NaOH dosing port for adding NaOH; the pH adjusting tank is provided with H2SO4A dosing port for adding H2SO4。
Wherein, the pH adjusting tank 4, the reduction tank 5, the precipitation reaction tank 6 and the final reaction tank 7 are provided with a metering electronic valve on a pipeline at the medicine adding port end to control the speed of the medicine, so that the medicine is added at a constant speed and quantitatively according to debugging data.
As shown in fig. 2, the aeration apparatus includes an extension pipe 11 and a gas outlet portion communicating with the extension pipe, and the extension pipe 11 serves to deliver gas to the gas outlet portion. The air outlet part comprises an air outlet pipe 13 and an air conveying pipe 12 communicated with the extension pipe 11, and the air conveying pipe 12 is used for conveying the air in the extension pipe 11 to the air outlet pipe 13. The 4 air pipes 12 are communicated end to end in sequence to form a rectangular passage, and the joint of every two air pipes 12 is provided with an air outlet pipe 13 with a pipe orifice facing the bottom of the treatment tank. The length of the outlet pipe 13 is 7 cm.
Wherein, the aeration equipment is provided with a control valve at the gas inlet end of the extension pipe so as to control the gas to pass through.
Na in the cold-rolled strip steel annealing and pickling line unit2SO4Is particularly used for purifying Na2SO4The method comprises the following steps:
when the neutral salt solution of the production line (the solution contains H)2CrO4And Na2SO4) After entering the pH adjusting tank 4 from the neutral salt storage tank 3, H is started2SO4A quantitative electronic valve for making H in the sulfuric acid tank 92SO4Adding the mixture into a pH adjusting tank 4 at a constant speed, and adjusting the flow of a quantitative electronic valve in time according to online pH monitoring data to ensure that the pH is about 3 so as to ensure that the mixture enters a reduction tank and can fully generate reduction reaction;
after the neutral salt solution in the pH adjusting tank 4 overflows to the reduction tank 5, the NaHSO is opened3Quantitative electronic valve, NaHSO3Enters a reduction tank 5 from a sodium bisulfite tank 8, and is NaHSO3And Na2SO4And residual H in the production of strip steel2CrO4And carrying out reduction reaction.
After the neutral salt solution in the reduction tank 5 overflows to the precipitation reaction tank 6, the NaOH quantitative electronic valve is opened to enable NaOH to enter the precipitation reaction tank 6 from the sodium hydroxide tank 10, the flow of the quantitative electronic valve is timely adjusted according to online pH monitoring data to ensure that the pH is 7.5-8.5 and the neutral salt and NaHSO are ensured3And (4) fully reacting.
After the precipitation reaction tank 6 reaches a set liquid level, a conveying pump is started, neutral salt in the precipitation reaction tank 6 is conveyed to the precipitation tank 2, precipitated substances in the neutral salt naturally precipitate in the precipitation tank 2, a diaphragm pump is connected to the bottom of the precipitation tank 2, and precipitates at the bottom of the precipitation tank 2 are conveyed to a filter press 1 through the diaphragm pump to filter the neutral salt so as to remove a mixture containing toxic hexavalent chromium.
The clean neutral salt solution at the upper part of the precipitation tank 2 and the clean neutral salt solution after filter pressing of the filter press 1 overflow toThe final reaction tank 7 is opened, the NaOH quantitative electronic valve and H are opened2SO4Quantitative electronic valves for NaOH in the sodium hydroxide tank 10 and H in the sulfuric acid tank 92SO4And (3) entering a final reaction tank 7, adjusting the flow of a quantitative electronic valve in time according to online pH monitoring data to ensure that the pH is 4-5, and conveying the neutralized clean neutral salt to a neutral salt storage tank by a pump of the final reaction tank 7 for generation and use.
Claims (10)
1. A purification device for sodium sulfate in a cold-rolled strip steel annealing and pickling line unit is characterized in that Na in the cold-rolled strip steel annealing and pickling line unit2SO4The purification apparatus of (1) comprises: the system comprises a filter press, a settling tank, a neutral salt storage tank, a pH adjusting tank, a reduction tank, a precipitation reaction tank and a final reaction tank; wherein the content of the first and second substances,
the neutral salt storage tank is communicated with the pH adjusting tank, the pH adjusting tank is communicated with the reducing tank, the reducing tank is communicated with the precipitation reaction tank, the filter press and the precipitation tank form a loop, the precipitation tank is communicated with the final reaction tank, the final reaction tank is communicated with the neutral salt storage tank, and the precipitation tank is communicated with the precipitation reaction tank;
the reduction pot is provided with NaHSO3A medicine adding port, wherein the precipitation reaction tank is provided with a NaOH medicine adding port;
the pH adjusting tank, the reduction tank, the precipitation reaction tank and the final reaction tank are respectively provided with aeration equipment.
2. The purification apparatus of claim 1, wherein the aeration device comprises an extension pipe and an air outlet portion in communication with the extension pipe, the air outlet portion comprising at least 4 air outlets.
3. The purification device of claim 2, wherein the gas outlet portion comprises a gas outlet pipe and a gas pipe communicated with the extension pipe, wherein the gas pipe is used for conveying gas in the extension pipe to the gas outlet pipe.
4. The purification device of claim 3, wherein the gas delivery pipe is a loop formed by sequentially connecting 4 vent pipes end to end, and a gas outlet pipe is arranged at the joint of every two vent pipes.
5. The purification apparatus according to claim 3 or 4, wherein the outlet of the outlet pipe is directed toward the bottom of the treatment tank.
6. The purification apparatus of claim 3, wherein the outlet tube has a length of 5cm to 10 cm.
7. The purification apparatus according to claim 1, wherein the aeration devices each have a control valve for controlling the flow of gas.
8. Purification device according to claim 1, wherein the final reaction tank is provided with H2SO4A dosing port, wherein the final reaction tank is provided with a NaOH dosing port; the pH adjusting tank is provided with H2SO4And a medicine adding port.
9. The purification apparatus of claim 1, further comprising a sodium bisulfite tank, a sulfuric acid tank, a sodium hydroxide tank; wherein, the sodium bisulfite tank is communicated with the reduction tank, the sulfuric acid tank is respectively communicated with the pH adjusting tank and the final reaction tank, and the sodium hydroxide tank is respectively communicated with the final reaction tank and the precipitation reaction tank.
10. The purification apparatus according to claim 9, wherein the pH adjustment tank, the reduction tank, the precipitation reaction tank, and the final reaction tank are provided with metering valves on the pipelines at the chemical inlet end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022073220.0U CN213265754U (en) | 2020-09-21 | 2020-09-21 | Purification device for sodium sulfate in cold-rolled strip steel annealing and pickling line unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022073220.0U CN213265754U (en) | 2020-09-21 | 2020-09-21 | Purification device for sodium sulfate in cold-rolled strip steel annealing and pickling line unit |
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| CN213265754U true CN213265754U (en) | 2021-05-25 |
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