CN212639975U - System for utilizing waste hydrochloric acid and pickling sludge - Google Patents
System for utilizing waste hydrochloric acid and pickling sludge Download PDFInfo
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- CN212639975U CN212639975U CN202021541009.0U CN202021541009U CN212639975U CN 212639975 U CN212639975 U CN 212639975U CN 202021541009 U CN202021541009 U CN 202021541009U CN 212639975 U CN212639975 U CN 212639975U
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Abstract
The application provides an among waste hydrochloric acid and the utilization system of pickling mud, include: a stirring tank, a reaction tank and a dissolving tank; the outlet of the stirring tank is connected with the inlet of the reaction tank; the outlet of the dissolving tank is connected with the inlet of the reaction tank. In the actual operation process, acid-washing sludge and waste hydrochloric acid are pumped into a stirring tank, and the waste hydrochloric acid reacts with iron ions in the acid-washing sludge under the stirring of the stirring tank to generate ferrous chloride and ferric chloride; then pumping the supernatant containing ferrous chloride and ferric chloride into a reaction tank; meanwhile, solid sodium chlorate and water are added into a dissolving tank, the solid sodium chlorate and the water are added into a reaction tank after the sodium chlorate is dissolved, ferrous chloride in the reaction tank generates ferric chloride under the action of a sodium chlorate solution, the ferric chloride obtained in the whole process is synthesized to polymerize for a plurality of hours to obtain the poly ferric chloride, and the poly ferric chloride can be used as a water purifying agent commonly used in the sewage treatment process, so that the recycling and harmless utilization of waste are realized.
Description
Technical Field
The application relates to the technical field of hazardous waste utilization and disposal, in particular to a utilization system of waste hydrochloric acid and pickling sludge.
Background
Sludge produced in waste water treatment (commonly called pickling sludge) and waste acidic washing liquor (commonly called waste hydrochloric acid) produced in the finish machining process of steel in the metal surface pickling, derusting and washing processes are both definite hazardous wastes in the national hazardous waste records.
The existing treatment mode of acid-washing sludge and waste hydrochloric acid is as follows: the acid-washing sludge is taken as hazardous waste and directly enters a hazardous waste landfill, so that the waste of resources is caused; the waste hydrochloric acid enters a physical and chemical treatment device and is treated by adopting a neutralization reaction mode, and inorganic salt generated in the neutralization process causes the increase of the sludge amount in the wastewater treatment. The above treatment methods cannot realize the recycling and harmless treatment of the acid-washing sludge or the waste hydrochloric acid.
SUMMERY OF THE UTILITY MODEL
The application provides a waste hydrochloric acid and utilization system of pickling sludge to realize resourceful and harmless treatment of pickling sludge and waste hydrochloric acid.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the application provides a system for utilizing waste hydrochloric acid and pickling sludge, includes:
a stirring tank, a reaction tank and a dissolving tank;
the outlet of the stirring tank is connected with the inlet of the reaction tank;
the outlet of the dissolving tank is connected with the inlet of the reaction tank.
Optionally, the system further comprises a filter press;
the bottom end of the stirring tank is connected with an inlet of the filter press;
the outlet of the filter press is connected with the inlet of the reaction tank.
Optionally, the system further comprises an absorption tank;
the outlets of the stirring tank and the reaction tank are both connected with the inlet of the absorption tank;
and the outlet of the absorption tank is connected with the inlet of the reaction tank.
Optionally, the system further comprises a waste hydrochloric acid material tank, wherein an outlet of the waste hydrochloric acid material tank is connected with the stirring tank, and another outlet of the waste hydrochloric acid material tank is connected with the absorption tank.
Optionally, the system further comprises an alkali absorption device, and the outlet of the absorption tank is connected with the inlet of the alkali absorption device.
Optionally, the system further comprises a pickling sludge material tank, and an outlet of the pickling sludge material tank is connected with the stirring tank.
Compared with the prior art, the beneficial effect of this application is:
according to the technical scheme, the utilization system of the waste hydrochloric acid and the acid washing sludge comprises: a stirring tank, a reaction tank and a dissolving tank; the outlet of the stirring tank is connected with the inlet of the reaction tank; the outlet of the dissolving tank is connected with the inlet of the reaction tank. In the actual operation process, acid-washing sludge and waste hydrochloric acid are pumped into a stirring tank, and the waste hydrochloric acid reacts with iron ions in the acid-washing sludge under the stirring of the stirring tank to generate ferrous chloride and ferric chloride; then pumping the supernatant containing ferrous chloride and ferric chloride into a reaction tank; solid sodium chlorate and water are added into a dissolving tank, the solid sodium chlorate and the water are added into a reaction tank after the sodium chlorate is dissolved, ferrous chloride in the reaction tank generates ferric chloride under the action of a sodium chlorate solution, the ferric chloride obtained in the whole process is synthesized to polymerize for hours to obtain the poly-ferric chloride, and the poly-ferric chloride can be used as a water purifying agent commonly used in the sewage treatment process, namely, through the dangerous waste utilization system provided by the application, the acid-washing sludge and the waste hydrochloric acid are treated at the same time, only the sodium chlorate needs to be additionally added, other reaction substances are not needed, the reaction principle and equipment are simple, and the implementation, popularization and use are easy; and finally obtaining the water purifying agent commonly used in the sewage treatment process, thereby really realizing the resource and harmless utilization of the wastes.
The embodiment of the application reasonably and skillfully utilizes the waste hydrochloric acid and the acid-washing sludge, can eliminate the corrosivity of the waste hydrochloric acid through reaction, can extract iron ions in the acid-washing sludge, and finally generates the water purifying agent polyferric chloride used in the sewage treatment process, so that the resource utilization of hazardous wastes is realized while the reduction and the harmlessness of the hazardous wastes are realized, and the economic benefit, the environmental benefit and the social benefit are created.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a utilization system of waste hydrochloric acid and acid-washed sludge according to an embodiment of the present application.
Wherein:
1-stirring tank, 2-reaction tank, 3-dissolving tank, 4-filter press, 5-absorption tank, 6-waste hydrochloric acid raw material tank, 7-alkali absorption device and 8-acid washing sludge raw material tank.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 shows a basic structure of a waste hydrochloric acid and acid sludge utilization system provided by an embodiment of the present application. The hazardous waste utilization system provided by the embodiment of the application is described below with reference to fig. 1.
Fig. 1 shows, according to an embodiment of the present application, a system for utilizing waste hydrochloric acid and acid-washed sludge, including:
a stirring tank 1, a reaction tank 2 and a dissolving tank 3;
the outlet of the stirring tank 1 is connected with the inlet of the reaction tank 2;
the outlet of the dissolving tank 3 is connected with the inlet of the reaction tank 2;
the acid-washing sludge raw material tank 8, the outlet of the acid-washing sludge raw material tank 8 is connected with the stirring tank 1;
a waste hydrochloric acid raw material tank 6, wherein an outlet of the waste hydrochloric acid raw material tank 6 is connected with the stirring tank 1.
In the actual operation process, acid-washing sludge in an acid-washing sludge raw material tank 8 and waste hydrochloric acid in a waste hydrochloric acid raw material tank 6 are pumped into a stirring tank 1, and waste hydrochloric acid reacts with iron ions in the acid-washing sludge under the stirring of the stirring tank 1 to generate ferrous chloride and ferric chloride; the specific reaction is as follows:
2 HCl+Fe2+→FeCl2+2H+ 3 HCl+Fe3+→FeCl3+3H+
then pumping the supernatant containing ferrous chloride and ferric chloride into a reaction tank 2; to add Fe2+Oxidation to Fe3+In the embodiment of the application, solid sodium chlorate and water are added into a dissolving tank, the solid sodium chlorate and the water are added into a reaction tank 2 after the sodium chlorate is dissolved, and ferrous chloride in the reaction tank 2 generates ferric chloride under the action of a sodium chlorate solution, so that the Fe is added2+Oxidation to Fe3+Of course, other oxidizing agents may be selected, and the specific reaction is as follows:
NaClO3﹢6FeCl2﹢6HCl—→NaCl﹢6FeCl3﹢3H2O
2FeCl3+nH2O—→Fe2(OH)n Cl6-n+nHCl
m[Fe2(OH)nCl6-n]—→[Fe2(OH)n Cl6-n]m
wherein n is more than 0 and less than or equal to 2
And synthesizing ferric chloride obtained in the whole process, polymerizing for several hours to obtain the polymeric ferric chloride, and specifically reacting for 3-4 hours to generate the product polymeric ferric chloride. The polyferric chloride can be used as a water purifying agent commonly used in the sewage treatment process, so that the recycling treatment of the acid-washing sludge and the waste hydrochloric acid is realized, and the method has good economic and social benefits.
The acid-washing sludge in the stirring tank 1 can settle at the bottom of the tank, and the part of sludge still contains iron ions capable of reacting, so that the system also comprises a filter press 4 in the embodiment of the application; the bottom end of the stirring tank 1 is connected with an inlet of the filter press 4; the outlet of the filter press 4 is connected to the inlet of the reaction tank 2. Therefore, the sludge at the bottom end of the stirring tank 1 is subjected to pressure filtration by the pressure filter 4 to obtain filtrate containing iron ions, and then the filtrate is connected with the inlet of the reaction tank 2 through the outlet of the pressure filter 4, so that the filtrate containing the iron ions can be added into the reaction tank 2, and the utilization efficiency of the acid-washing sludge is improved.
Part of hydrogen chloride gas is volatilized under the stirring of the stirring tank 1, and simultaneously part of hydrogen chloride gas is volatilized in the reaction tank 2, and in order to collect the two volatilized hydrogen chloride gases, the system also comprises an absorption tank 5; outlets of the stirring tank 1 and the reaction tank 2 are both connected with an inlet of an absorption tank 5; the outlet of the absorption tank 5 is connected to the inlet of the reaction tank 2. Thus, the absorption tank 5 can intensively absorb and treat the hydrogen chloride gas volatilized from the stirring tank 1 and the reaction tank 2; and the outlet of the absorption tank is connected with the inlet of the reaction tank.
The system further comprises a waste hydrochloric acid raw material tank 6, wherein an outlet of the waste hydrochloric acid raw material tank 6 is connected with the stirring tank 1, and the other outlet of the waste hydrochloric acid raw material tank is connected with the absorption tank 5, so that the waste hydrochloric acid and the volatilized hydrogen chloride gas are gathered in the absorption tank 5, the hydrogen chloride gas and the waste hydrochloric acid are in countercurrent contact in the absorption tank, the waste hydrochloric acid absorbs the hydrogen chloride gas and then enters the reaction tank 2, the volatilized hydrogen chloride gas is collected and participates in a reaction system, and the utilization efficiency of the waste hydrochloric acid is improved.
Because the hydrogen chloride gas is volatile, part of the hydrogen chloride gas still volatilizes in the absorption tank 5, therefore, the system also comprises an alkali absorption device 7, the outlet of the absorption tank 5 is connected with the inlet of the alkali absorption device 7, and the hydrogen chloride gas volatilized in the absorption tank 5 enters the alkali absorption device 7 for harmless treatment.
In the process of utilizing acid-washing sludge and waste hydrochloric acid, sludge generated by filter pressing is entrusted to be treated, and the treated hydrogen gas containing the chlorine chloride is discharged up to the standard without generating environmental pollution.
Through the waste treatment system provided by the application, the two wastes of the acid-washing sludge and the waste hydrochloric acid are utilized simultaneously, only sodium chlorate needs to be additionally added, other reaction substances are not needed, the reaction principle and equipment are simple, and the method is easy to realize, popularize and use; and finally obtaining the water purifying agent commonly used in the sewage treatment process, thereby really realizing the resource and harmless utilization of the wastes.
The embodiment of the application reasonably utilizes the waste hydrochloric acid and the acid-washing sludge, can eliminate the corrosivity of the waste hydrochloric acid through reaction, can extract iron ions in the acid-washing sludge, generates the water purifying agent polyferric chloride used in the sewage treatment process, realizes the reduction and the harmlessness of hazardous wastes, realizes the resource utilization of the hazardous wastes, and creates economic benefits, environmental benefits and social benefits.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (6)
1. A system for utilizing waste hydrochloric acid and acid-washing sludge is characterized by comprising:
a stirring tank (1), a reaction tank (2) and a dissolving tank (3);
the outlet of the stirring tank (1) is connected with the inlet of the reaction tank (2);
the outlet of the dissolving tank (3) is connected with the inlet of the reaction tank (2).
2. The system for utilizing waste hydrochloric acid and acid-washed sludge as claimed in claim 1, wherein said system further comprises a filter press (4);
the bottom end of the stirring tank (1) is connected with an inlet of the filter press (4);
the outlet of the filter press (4) is connected with the inlet of the reaction tank (2).
3. The system for utilizing waste hydrochloric acid and acid-washed sludge as claimed in claim 1, wherein said system further comprises an absorption tank (5);
the outlets of the stirring tank (1) and the reaction tank (2) are connected with the inlet of the absorption tank (5);
the outlet of the absorption tank (5) is connected with the inlet of the reaction tank (2).
4. The system for utilizing waste hydrochloric acid and pickling sludge as defined in claim 3, further comprising a waste hydrochloric acid raw material tank (6), wherein one outlet of the waste hydrochloric acid raw material tank (6) is connected to the agitation tank (1), and the other outlet is connected to the absorption tank (5).
5. The utilization system of waste hydrochloric acid and acid sludge according to claim 3, characterized in that said system further comprises an alkali absorption device (7), and the outlet of said absorption tank (5) is connected with the inlet of said alkali absorption device (7).
6. The system for utilizing waste hydrochloric acid and pickling sludge as claimed in claim 1, further comprising a pickling sludge feed tank (8), wherein an outlet of the pickling sludge feed tank (8) is connected to the agitation tank (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021541009.0U CN212639975U (en) | 2020-07-29 | 2020-07-29 | System for utilizing waste hydrochloric acid and pickling sludge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021541009.0U CN212639975U (en) | 2020-07-29 | 2020-07-29 | System for utilizing waste hydrochloric acid and pickling sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772651A (en) * | 2022-05-26 | 2022-07-22 | 广东碧之江环保能源股份有限公司 | Production method of poly ferric chloride |
| CN115072948A (en) * | 2022-05-09 | 2022-09-20 | 昆明华信金属材料制造有限公司 | Acid pickling sludge recycling method |
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2020
- 2020-07-29 CN CN202021541009.0U patent/CN212639975U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115072948A (en) * | 2022-05-09 | 2022-09-20 | 昆明华信金属材料制造有限公司 | Acid pickling sludge recycling method |
| CN114772651A (en) * | 2022-05-26 | 2022-07-22 | 广东碧之江环保能源股份有限公司 | Production method of poly ferric chloride |
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