CN215440113U - Harmless treatment system for pickling sludge - Google Patents
Harmless treatment system for pickling sludge Download PDFInfo
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- CN215440113U CN215440113U CN202121782756.8U CN202121782756U CN215440113U CN 215440113 U CN215440113 U CN 215440113U CN 202121782756 U CN202121782756 U CN 202121782756U CN 215440113 U CN215440113 U CN 215440113U
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Abstract
The utility model relates to the technical field of environmental protection of metal surface pickling waste liquid treatment, in particular to a pickling sludge harmless treatment system. Comprises a first sludge conveying mechanism; one feeding port of the desalting and washing tank is connected with a discharge port of the first sludge conveying mechanism, and water is added into the other feeding port; the filter press is connected with a discharge hole of the desalting and washing tank and is used for pressing out moisture in the pickling sludge; one material inlet of the second sludge conveying mechanism is connected with a material outlet of the filter press, and waste glass is added into the other material inlet; the feeding port of the plasma melting furnace is connected with the discharging port of the second sludge conveying mechanism and is used for melting the mixture of the acid-washing sludge and the waste glass into a glass body; the water quenching chamber is connected with a discharge port of the plasma melting furnace and is used for cooling the glass body in a molten state; the tail gas treatment device is connected with an exhaust port of the plasma melting furnace. Realizes the reduction, resource and harmless treatment of the acid pickling sludge and has obvious economic, environmental and social benefits.
Description
Technical Field
The utility model relates to the technical field of environmental protection of metal surface pickling waste liquid treatment, in particular to a pickling sludge harmless treatment system.
Background
In the rolling industry, when hydrochloric acid or sulfuric acid is adopted to wash the metal surface to remove oxides on the metal surface, pickling wastewater is generated, solid waste, namely pickling sludge, is generated after alkali neutralization of the pickling wastewater, the pickling sludge contains heavy metals such as nickel, chromium, iron and other metals and residual acid, and if the pickling sludge is not subjected to harmless treatment, the pickling sludge can cause harm to the environment and human bodies.
The prior acid-washing sludge treatment method basically adopts the methods of washing, drying and preparing cement. CN105734297 naturally dries the stainless steel acid-washing sludge to reduce the water content to 50%, then carries out high-temperature roasting on the acid-washing sludge, coke and binder after batching, mixing and granulating to convert hexavalent chromium into trivalent chromium; although the toxicity of chromium in the sludge is removed, the obtained solid is sent to a smelting plant for smelting, and the acid washing sludge contains a large amount of silicon dioxide, so that the quality of smelting is influenced by sending the silicon dioxide and the chromium-nickel heavy metal to the smelting plant together. CN 2087127 adopts secondary countercurrent washing to recover iron element in acid-washing sludge, while elements such as chromium, nickel and the like which are not dissolved in the process remain in silicon mud, which is also dangerous waste, and a large amount of acid is needed in secondary washing, and the volatilization of acid mist can affect the environment. CN101086035 adds hydrogen peroxide and potassium permanganate solution into the pickling sludge for strong oxidation and air natural oxidation, and the sludge is dried and then directly used as a cement raw material, so that a large amount of oxidant is wasted, and the quality of the cement is influenced. Therefore, a treatment system for recycling, reducing and thoroughly harmlessly treating the acid-washing sludge is needed.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a treatment system for recycling, reducing and thoroughly harmlessly treating acid-washing sludge. Not only can effectively remove salt (mainly sodium salt and calcium salt generated by neutralization) in the acid-washing sludge, but also can completely melt heavy metals of chromium and nickel in the acid-washing sludge into vitreous body for harmless treatment.
The utility model adopts the following technical scheme: a pickling sludge innocent treatment system comprises:
the first sludge conveying mechanism is used for conveying pickling sludge;
one feeding port of the desalting and washing tank is connected with a discharge port of the first sludge conveying mechanism, and water is added into the other feeding port and is used for mixing, stirring and reacting the water and the acid-washed sludge;
the filter press is connected with a discharge hole of the desalting and washing tank and is used for pressing out moisture in the pickling sludge;
one material inlet of the second sludge conveying mechanism is connected with a material outlet of the filter press, and waste glass is added into the other material inlet of the second sludge conveying mechanism and is used for conveying and uniformly mixing the acid-washing sludge and the waste glass;
the feeding port of the plasma melting furnace is connected with the discharging port of the second sludge conveying mechanism and is used for melting the mixture of the acid-washing sludge and the waste glass into a glass body;
the water quenching chamber is connected with a discharge port of the plasma melting furnace and is used for cooling the glass body in a molten state;
and the tail gas treatment device is connected with the exhaust port of the plasma melting furnace and is used for treating the waste gas.
Further, the tail gas treatment device comprises a bag-type dust collector, a desulfurization device and a denitrification device, wherein an air inlet of the bag-type dust collector is connected with the plasma melting furnace, an air outlet of the bag-type dust collector is connected with the desulfurization device, an ash discharge port of the bag-type dust collector is connected with the second sludge conveying mechanism, and an air outlet of the desulfurization device is connected with the denitrification device.
Further, the plasma melting furnace is provided with a plasma torch.
Further, a cooling system is arranged on the plasma torch, the cooling system comprises a water cooling sleeve arranged on the plasma torch, a circulating water pump and a refrigerating machine, the water cooling sleeve, the circulating water pump and the refrigerating machine are connected through a circulating water pipe, and cooling water flows in the circulating water pipe.
Further, the cooling water is deionized water.
Further, a sludge pump is arranged between the desalting and washing tank and the filter press.
Further, the first sludge conveying mechanism is a sludge screw conveyor, and the second sludge conveying mechanism is a double-screw sludge conveyor.
The utility model has the beneficial effects that: according to the utility model, water and sludge are mixed by the delay washing tank, then water is pressed out by the filter press, and salt in the sludge is taken out by water, so that sludge desalting is realized. The utility model melts the sludge and the waste glass slag together through the plasma melting furnace, melts the heavy metal in the vitreous body, thereby realizing the reduction, recycling and harmless treatment of the acid-washing sludge, and having remarkable economic, environmental and social benefits.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.
Example 1: as shown in fig. 1, the structure of the present invention includes: the device comprises a first sludge conveying mechanism 1, a desalting and washing tank 2, a filter press 4, a second sludge conveying mechanism 5, a plasma melting furnace 6, an ion torch 7, a water quenching chamber 8, a water cooling jacket, a circulating water pump 9, a refrigerator 10 and a tail gas treatment device, wherein the first sludge conveying mechanism 1 can be a sludge screw conveyor and is used for conveying pickling sludge and stirring the sludge while conveying the pickling sludge. A pan feeding mouth and the 1 discharge gate of first mud conveying mechanism of desalination washing jar 2 are connected, and water is added to another pan feeding mouth for mix the stirring and react water and pickling mud. Wherein the stirrer in the desalting and washing tank 2 fully mixes the mud and the water, and stands the mixture for homogeneous reaction of the mud and the water. The filter press 4 is connected with the discharge port of the desalting and washing tank 2, after the homogeneous reaction of the muddy water, the water in the acid-washing sludge is pressed out, the pressed water is sent to a sewage treatment plant, and the salt (mainly sodium chloride, sodium sulfate and the like) in the sludge is fully dissolved in the water. A sludge pump 3 is arranged between the desalting and washing tank 2 and the filter press 4, and sludge is pumped into the filter press 4. A feeding port of the second sludge conveying mechanism 5 is connected with a discharging port of the filter press 4, and waste glass is added into the other feeding port and is used for conveying the acid washing sludge and the waste glass and enabling the acid washing sludge and the waste glass to be uniformly mixed. The second sludge conveying mechanism 5 can adopt a double-screw sludge conveyor, and the acid-washing sludge and the waste glass are conveyed to the plasma melting furnace under the uniform stirring and mixing action of the double-screw sludge conveyor. And a feeding port of the plasma melting furnace 6 is connected with a discharging port of the second sludge conveying mechanism 5 and is used for melting the mixture of the acid-washing sludge and the waste glass into a glass body. The sludge and the waste glass which are uniformly mixed melt the sludge mixture into a vitreous body under the high-temperature action of plasma, and heavy metals cadmium and nickel in the sludge are all solidified in silicon-oxygen bonds in the vitreous body and are not precipitated under the soaking of strong acid. The water quenching chamber 8 is connected with a discharge hole of the plasma melting furnace 6 and is used for cooling the molten glass body, fishing out the molten glass body from the slag dragging machine and conveying the molten glass body to a glass slag storage yard for resource utilization, such as floor tiles, paving and building material raw materials. The tail gas treatment device is connected with an exhaust port of the plasma melting furnace 6 and is used for treating waste gas.
The tail gas treatment device adopted by the utility model comprises a bag-type dust collector 11, a desulfurization device 12 and a denitrification device 13, wherein a gas inlet of the bag-type dust collector 11 is connected with a plasma melting furnace 6, a gas outlet is connected with the desulfurization device 12, a dust outlet of the bag-type dust collector 11 is connected with a second sludge conveying mechanism 5, and a gas outlet of the desulfurization device 12 is connected with the denitrification device 13. And tail gas generated by the plasma melting furnace is subjected to dust removal by the bag-type dust remover, and the collected dust is conveyed to the double-helix sludge conveyor and conveyed to the plasma melting furnace for melting. And the tail gas passes through a bag-type dust collector, is subjected to desulfurization and denitrification and is discharged after reaching the standard.
The plasma melting furnace 6 is provided with a plasma torch 7. The plasma torch 7 is provided with a cooling system, the cooling system comprises a water cooling sleeve arranged on the plasma torch 7, a circulating water pump 9 and a refrigerator 10, the water cooling sleeve, the circulating water pump 9 and the refrigerator are connected through a circulating water pipe, and cooling water flows in the circulating water pipe. Prevent tap water from scaling in the process of heat exchange with plasma, and deionized water is used as the water. Deionized water is added into the refrigerator, the refrigerator cools the deionized water, the deionized water is cooled to below 50 ℃ and then is conveyed to a water cooling sleeve of the plasma torch to cool the cathode and the anode of the plasma torch, and the deionized water is pumped into the refrigerator by a deionized water circulating pump to cool water after exchanging heat with the plasma torch.
The plasma torch can adopt a non-transferred arc plasma torch and can also adopt a transferred arc plasma torch, wherein the non-transferred arc plasma torch can adopt a multi-stage plasma torch and can also adopt a single-anode plasma torch.
The homogeneous desalting tank may be one batch desalting process with several desalting tanks or one intermittent desalting tank.
The utility model also relates to a harmless treatment method of the pickling sludge, which comprises the following steps:
step 1, stirring and mixing water and acid-washing sludge in proportion and homogenizing;
step 2, dehydrating the mixture of water and acid-washing sludge, and sending the wastewater into a sewage treatment plant for treatment;
step 4, carrying out plasma smelting on the mixture of the dewatered acid-washing sludge and the waste glass, and solidifying heavy metals in the acid-washing sludge in silicon-oxygen bonds in a glass body;
and 6, treating waste gas generated in the smelting process.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The harmless treatment system for the acid pickling sludge is characterized by comprising:
the first sludge conveying mechanism (1) is used for conveying pickling sludge;
one feeding port of the desalting and washing tank (2) is connected with a discharging port of the first sludge conveying mechanism (1), and water is added into the other feeding port and is used for mixing, stirring and reacting the water and the acid-washing sludge;
the filter press (4) is connected with the discharge hole of the desalting and washing tank (2) and is used for pressing out the water in the pickling sludge;
a second sludge conveying mechanism (5), wherein one material inlet is connected with a material outlet of the filter press (4), and the other material inlet is added with waste glass and is used for conveying the acid-washing sludge and the waste glass and uniformly mixing the acid-washing sludge and the waste glass;
the plasma melting furnace (6) is connected with the material inlet and the material outlet of the second sludge conveying mechanism (5) and is used for melting the mixture of the acid-washing sludge and the waste glass into a glass body;
the water quenching chamber (8) is connected with a discharge hole of the plasma melting furnace (6) and is used for cooling the glass body in a molten state;
and the tail gas treatment device is connected with an exhaust port of the plasma melting furnace (6) and is used for treating waste gas.
2. The harmless treatment system for the acid-washing sludge according to claim 1, wherein the tail gas treatment device comprises a bag-type dust collector (11), a desulfurization device (12) and a denitrification device (13), an air inlet of the bag-type dust collector (11) is connected with the plasma melting furnace (6), an air outlet of the bag-type dust collector (11) is connected with the desulfurization device (12), an ash outlet of the bag-type dust collector (11) is connected with the second sludge conveying mechanism (5), and an air outlet of the desulfurization device (12) is connected with the denitrification device (13).
3. The harmless treatment system for acid-washing sludge according to claim 1, wherein the plasma melting furnace (6) is provided with a plasma torch (7).
4. The harmless treatment system for the acid pickling sludge as defined in claim 3, wherein a cooling system is arranged on the plasma torch (7), and the cooling system comprises a water cooling jacket arranged on the plasma torch (7), a circulating water pump (9) and a refrigerating machine (10), which are connected through a circulating water pipe, and cooling water flows in the circulating water pipe.
5. The harmless treatment system for acid-washing sludge according to claim 4, wherein the cooling water is deionized water.
6. The harmless treatment system for acid-washing sludge according to claim 1, wherein a sludge pump (3) is arranged between the desalting and washing tank (2) and the filter press (4).
7. The harmless treatment system for acid-washing sludge according to claim 1, wherein the first sludge conveying mechanism (1) is a sludge screw conveyor, and the second sludge conveying mechanism (5) is a double-screw sludge conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121782756.8U CN215440113U (en) | 2021-08-02 | 2021-08-02 | Harmless treatment system for pickling sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121782756.8U CN215440113U (en) | 2021-08-02 | 2021-08-02 | Harmless treatment system for pickling sludge |
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| Publication Number | Publication Date |
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| CN215440113U true CN215440113U (en) | 2022-01-07 |
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| CN202121782756.8U Active CN215440113U (en) | 2021-08-02 | 2021-08-02 | Harmless treatment system for pickling sludge |
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2021
- 2021-08-02 CN CN202121782756.8U patent/CN215440113U/en active Active
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