CN214004387U - Heavy metal-containing sludge treatment system - Google Patents
Heavy metal-containing sludge treatment system Download PDFInfo
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- CN214004387U CN214004387U CN202022479466.8U CN202022479466U CN214004387U CN 214004387 U CN214004387 U CN 214004387U CN 202022479466 U CN202022479466 U CN 202022479466U CN 214004387 U CN214004387 U CN 214004387U
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Abstract
The utility model relates to the field of wastewater treatment equipment, in particular to a heavy metal-containing sludge treatment system, which comprises a pulping unit, a gypsum and copper separation unit and a nickel-zinc-manganese separation unit which are connected in sequence; the nickel-zinc-manganese separation unit comprises ion exchange equipment, a zinc separation reaction tank and a nickel separation reaction tank; a first outlet of the ion exchange equipment is communicated with an inlet of the nickel separation reaction tank, a second outlet of the ion exchange equipment is communicated with an inlet of the zinc separation reaction tank, and an inlet of the ion exchange equipment is communicated with the gypsum and copper separation unit; the outlet of the zinc separation reaction tank is communicated with a zinc separation filter press, the liquid material outlet of the zinc separation filter press is communicated with a manganese separation reaction tank, and the manganese separation reaction tank is communicated with a manganese separation filter press; the outlet of the nickel separation reaction tank is communicated with the inlet of a nickel separation filter press. The system solves the technical problem of simultaneously recovering four metal elements of copper, nickel, zinc and manganese from sludge, and can be applied to practical operation of recycling heavy metal ions in sludge.
Description
Technical Field
The utility model relates to a waste water treatment equipment field, concretely relates to contain heavy metal sludge treatment system.
Background
With the acceleration of the urbanization process, the discharge amount of domestic wastewater and industrial wastewater is increasing day by day, and the output of sludge as a sewage treatment by-product is also correspondingly increased. The components of the sludge are complex, particularly harmful heavy metal elements, and the survival, health and development of human beings are seriously threatened. The sludge resource utilization is an inevitable way for sludge treatment, but heavy metals in the sludge seriously hinder the sludge resource utilization. In addition, heavy metals themselves can be used as resources. The types and contents of heavy metals in different sludges are different due to different sources and types of the sludges. How to separate specific heavy metal substances in sludge from the sludge and recycle the heavy metal substances is an urgent problem to be solved. Particularly for sludge containing copper, nickel, zinc and manganese, no equipment and process for respectively and effectively recovering the four substances exist at present.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it aims at providing and contains heavy metal sludge treatment system, has solved the technical problem who retrieves four kinds of metallic element of copper nickel zinc manganese from mud simultaneously.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the heavy metal-containing sludge treatment system comprises a pulping unit, a gypsum and copper separation unit and a nickel-zinc-manganese separation unit which are connected in sequence; the nickel-zinc-manganese separation unit comprises ion exchange equipment, a zinc separation reaction tank and a nickel separation reaction tank; a first outlet of the ion exchange equipment is communicated with an inlet of the nickel separation reaction tank, a second outlet of the ion exchange equipment is communicated with an inlet of the zinc separation reaction tank, and an inlet of the ion exchange equipment is communicated with the gypsum and copper separation unit; the zinc separation reaction tank is communicated with a zinc separation filter press, a liquid material outlet of the zinc separation filter press is communicated with a manganese separation reaction tank, and the manganese separation reaction tank is communicated with a manganese separation filter press; the nickel separation reaction tank is communicated with an inlet of a nickel separation filter press; the nickel-zinc-manganese separation unit also comprises a sodium carbonate dosing tank for adding a reagent to the nickel separation reaction tank and a liquid caustic soda dosing tank for adding a reagent to the nickel separation reaction tank.
The application method, the principle and the advantages of the scheme are as follows: the sludge is treated by the pulping unit to form slurry, and then treated by the gypsum and copper separation unit to remove substances such as calcium, copper and the like in the materials. After pulping and gypsum and copper separation treatment, the materials enter a nickel-zinc-manganese separation unit, and substances containing nickel, zinc and manganese are separated step by step. In the nickel-zinc-manganese separation unit, the material enters ion exchange equipment (extraction and back extraction integrated equipment), and after extraction, aqueous phase raffinate (nickel-containing liquid) enters a nickel separation reaction tank through a first outlet of the ion exchange equipment. And performing back extraction, wherein the water phase (containing zinc and manganese) enters a zinc separation reaction tank through a second outlet of the ion exchange equipment. Adding sodium carbonate solution into a nickel separation reaction tank, and separating nickel-containing substances through treatment of a nickel separation filter press. Adding alkali liquor into a zinc separation reaction tank, and treating by a zinc separation filter press to separate out zinc-containing substances. Liquid materials in the zinc separation filter press enter a manganese separation reaction tank through a liquid material outlet, alkali liquor is added into the manganese separation reaction tank, and then the manganese-containing substances are separated out through the treatment of the manganese separation filter press. So far, three elements of nickel, zinc and manganese in the sludge are separated and can be respectively recycled. Calcium element, copper element, nickel element, zinc element and manganese element in the sludge can be recovered through the treatment of the pulping unit, the gypsum and copper separation unit and the nickel-zinc-manganese separation unit. The system is very suitable for treating and recovering sludge containing a large amount of calcium, copper, nickel, zinc and manganese, and realizes the recovery of renewable resources and the treatment of environmental pollution.
Preferably, as an improvement, the system further comprises a reuse water unit. Therefore, the waste water generated in the system is recycled, the energy is saved, and the material utilization rate is improved.
Preferably, as an improvement, the pulping unit comprises a pulping tank and a slurry intermediate tank which are connected in sequence; the pulping unit further comprises a dilute sulfuric acid storage tank for adding dilute sulfuric acid to the pulping tank. The sludge is converted into slurry by a pulping unit for subsequent process treatment.
Preferably, as an improvement, the gypsum and copper separation unit comprises an acid leaching reaction tank, an acid leaching filter press, a gypsum purification tank, a copper replacement reaction tank, a copper separation filter press and a concentrated sulfuric acid storage tank; an outlet of the slurry intermediate tank is communicated with an inlet of an acid leaching reaction tank, an outlet of the acid leaching reaction tank is communicated with an inlet of an acid leaching filter press, a solid material outlet of the acid leaching filter press is communicated with an inlet of a gypsum purification tank, a liquid material outlet of the acid leaching filter press is communicated with an inlet of a copper replacement reaction tank, and an outlet of the copper replacement reaction tank is communicated with an inlet of a copper separation filter press; the concentrated sulfuric acid storage tank is used for adding concentrated sulfuric acid into the acid leaching reaction tank. Thus, the heavy metal in the slurry is dissolved by acid leaching; forming a solid material and a liquid material with subsequent treatment in an acid leaching filter press; the solid material enters a gypsum purification tank, and a filter cake containing gypsum is obtained after reaction; and (3) the liquid material enters a copper displacement reaction tank, and is subjected to displacement reaction and subsequent treatment by a copper separation filter press to obtain a filter cake containing copper. Therefore, gypsum and copper can be recycled in advance, and the liquid material flowing out of the copper separation filter press is used for subsequent process treatment (nickel-zinc-manganese separation unit).
Preferably, as a refinement, the reuse water unit comprises a circulation water tank, a crystallization tank and a centrifuge; the outlet of the circulating water tank is communicated with the inlet of the crystallizing tank, the outlet of the crystallizing tank is communicated with the inlet of the centrifugal machine, and the outlet of the centrifugal machine is communicated with the water inlet of the pulping tank. Sodium sulfate crystals can be separated out through crystallization treatment, the ion content in the wastewater is reduced, and the treated wastewater can be recycled.
Preferably, as an improvement, the inlet of the ion exchange device is communicated with the outlet of the intermediate tank, and the liquid material outlet of the copper separation filter press is communicated with the inlet of the intermediate tank. The intermediate tank is used for temporarily storing materials, and after the setting of various parameters of the ion exchange equipment is completed, the materials are intermittently input into the ion exchange equipment.
Preferably, as a modification, the outlet of the slurry intermediate tank is communicated with the inlet of the acid leaching reaction tank. The materials after pulping form slurry which can be treated in an acid leaching reaction tank to fully dissolve the heavy metals in the sludge.
Preferably, as a modification, the inlet of the circulation water tank is communicated with the liquid material outlet of the nickel separation filter press, and the inlet of the circulation water tank is communicated with the liquid material outlet of the manganese separation filter press. The liquid material outlet of the nickel separation filter press and the liquid material outlet of the manganese separation filter press can both generate wastewater, the wastewater can be conveyed to the circulating water tank, and after treatment, the wastewater forms reuse water which can be reused.
Preferably, as an improvement, a solid material outlet of the copper separation filter press is communicated with a copper recovery discharge channel; a solid material outlet of the zinc separation filter press is communicated with a zinc recovery discharge channel; a solid material outlet of the manganese separation filter press is communicated with a manganese recovery discharge channel; and a solid material outlet of the nickel separation filter press is communicated with a nickel recovery discharge channel. And a solid material outlet of the copper separation filter press can recover and obtain a copper-containing filter cake, so that the copper can be recycled. And respectively recovering a zinc-containing filter cake, a manganese-containing filter cake and a nickel-containing filter cake from a solid material outlet of the zinc separation filter press, a solid material outlet of the manganese separation filter press and a solid material outlet of the nickel separation filter press, so that the zinc, the manganese and the nickel are respectively recycled.
Preferably, as an improvement, an iron reaction tank and an iron separation filter press are further arranged between the copper separation filter press and the intermediate tank. Because a certain amount of iron powder is added into the copper replacement reaction tank to replace copper, a certain amount of iron ions are remained in the materials, and the subsequent extraction, back extraction and precipitation processes are influenced. An iron reaction tank and an iron separation filter press are arranged between the copper separation filter press and the intermediate tank, so that iron ions in the materials can be removed.
Drawings
FIG. 1 is a schematic diagram of the equipment connections of a pulping unit of example 1.
FIG. 2 is a schematic diagram of the equipment connections of the gypsum and copper separation unit of example 1.
Fig. 3 is a schematic diagram of the equipment connections of the nickel zinc manganese separation unit of example 1.
Fig. 4 is a schematic diagram of the equipment connections of the reuse water unit of example 2.
Fig. 5 is a schematic diagram of the equipment connections of the nickel zinc manganese separation unit of example 3.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the system comprises a pump 1, a dilute sulfuric acid storage tank 2, a concentrated sulfuric acid storage tank 3, a pulping tank 4, a slurry intermediate tank 5, an acid leaching reaction tank 6, an acid leaching filter press 7, a gypsum purification tank 8, a copper replacement reaction tank 9, a copper separation filter press 10, a circulating water tank 11, a crystallization tank 12, a centrifuge 13, an intermediate tank 14, ion exchange equipment 15, a zinc separation reaction tank 16, a zinc separation filter press 17, a manganese separation reaction tank 18, a manganese separation filter press 19, a liquid caustic soda dosing tank 20, a nickel separation reaction tank 21, a sodium carbonate dosing tank 22, a nickel separation filter press 23, an iron separation reaction tank 24, an iron separation filter press 25, a sludge feeding channel A, a water inlet pipe B, a copper recovery discharge channel C, a wastewater feeding pipe D, a reuse water discharge pipe E, a nickel recovery discharge channel F, a zinc recovery discharge channel G and a manganese recovery discharge channel H.
Example 1:
the heavy metal-containing sludge treatment system comprises a pulping unit, a gypsum and copper separation unit and a nickel-zinc-manganese separation unit.
As shown in figure 1, the pulping unit comprises a pulping tank 4 and a slurry intermediate tank 5 which are sequentially connected through a pipeline, wherein a water inlet, a slurry inlet and a dilute sulfuric acid inlet are arranged on the pulping tank 4, the water inlet is communicated with a water inlet pipe B, the slurry inlet is communicated with a sludge feeding channel A, and the dilute sulfuric acid inlet is communicated with a dilute sulfuric acid storage tank 2 through a pipeline. A pump 1 is arranged on a pipeline between the pulping tank 4 and the dilute sulfuric acid storage tank 2 and is used for pumping materials from the dilute sulfuric acid storage tank 2 to the pulping tank 4. The outlet of the pulping tank 4 is communicated with the inlet of the slurry intermediate tank 5 through a pipeline. In the pulping tank 4, the sludge, dilute sulfuric acid and water are mixed to form a slurry, the material flows to a slurry intermediate tank 5, and in the slurry intermediate tank 5, the slurry is further mixed thoroughly.
As shown in fig. 2, the gypsum and copper separation unit includes a concentrated sulfuric acid storage tank 3, an acid leaching reaction tank 6, an acid leaching filter press 7, a gypsum purification tank 8, a copper displacement reaction tank 9, and a copper separation filter press 10. An outlet of the slurry intermediate tank 5 is communicated with an inlet of the acid leaching reaction tank 6 through a pipeline, and a pump 1 is arranged on the pipeline between the slurry intermediate tank 5 and the acid leaching reaction tank 6. The outlet of the concentrated sulfuric acid storage tank 3 is communicated with the inlet of the acid leaching reaction tank 6 through a pipeline, and a pump 1 is arranged on the pipeline between the concentrated sulfuric acid storage tank 3 and the acid leaching reaction tank 6. The outlet of the acid leaching reaction tank 6 is communicated with the inlet of the acid leaching filter press 7 through a pipeline, the solid material outlet of the acid leaching filter press 7 is communicated with the inlet of the gypsum purification tank 8 through a pipeline, and the liquid material outlet of the acid leaching filter press 7 is communicated with the inlet of the copper replacement reaction tank 9 through a pipeline. The outlet of the copper replacement reaction tank 9 is communicated with the inlet of the copper separation filter press 10 through a pipeline, and a pump 1 is arranged on the pipeline between the copper replacement reaction tank 9 and the copper separation filter press 10. The liquid material outlet of the copper separation filter press 10 is communicated with an iron-chromium-aluminum separation unit (described in detail later) shown in fig. 3, and the solid material outlet of the copper separation filter press 10 is communicated with a copper recovery discharge channel C to collect a filter cake containing copper.
In the acid leaching reaction tank 6, slurry from the slurry intermediate tank 5 is mixed with concentrated sulfuric acid, heavy metal ions in the slurry are fully dissolved, then the material flows to the acid leaching filter press 7, after filtration and compression treatment, the solid material obtained in the solid material outlet of the acid leaching filter press 7 enters a gypsum purification tank 8, and then reacts with lime water to obtain a gypsum-containing filter cake (which needs to be collected). Inputting liquid materials into a copper replacement reaction tank 9 from a liquid material outlet of an acid leaching filter press 7, adding reactants such as iron powder into the copper replacement reaction tank 9, carrying out replacement reaction in the copper replacement reaction tank 9, enabling the reacted materials to enter an inlet of a copper separation filter press 10 through a pipeline, collecting copper-containing filter cakes (needing to be collected) at a copper recovery discharge channel C after filtration and separation treatment, and enabling the liquid materials flowing out of an outlet of the copper separation filter press 10 to enter a nickel-zinc-manganese separation unit shown in figure 3.
As shown in fig. 3, the nickel-zinc-manganese separation unit includes a tundish 14, an ion exchange device 15, a zinc separation reaction tank 16, a zinc separation filter press 17, a manganese separation reaction tank 18, a manganese separation filter press 19, a liquid caustic soda dosing tank 20, a nickel separation reaction tank 21, a sodium carbonate dosing tank 22, and a nickel separation filter press 23. The liquid material outlet of the copper separation filter press 10 is in pipe communication with the inlet of the intermediate tank 14, the intermediate tank 14 being used for temporary storage of the material. The outlet of the intermediate tank 14 communicates with the inlet of the ion exchange device 15 via a pipe. A pump 1 is arranged on the pipe between the intermediate tank 14 and the ion exchange device 15. The ion exchange equipment 15 is an integrated extraction equipment (extraction and back extraction are completed in the equipment), the extraction and back extraction processes are completed in the integrated extraction equipment, saponification, extraction and back extraction are sequentially carried out, and the back extracted organic phase (namely the extractant P204: bis (2-ethylhexyl) phosphate) is recycled in the system. The saponification liquid (30% liquid caustic soda), the P204 extractant and the back extractant (20% dilute sulfuric acid) are pumped into the extraction equipment at one time, the material in the intermediate tank 14 is pumped into the extraction equipment, and the flow rates of the saponification liquid, the extractant and the back extractant are controlled by a flow meter of the equipment. The material firstly enters the saponification section of the extraction equipment and then enters the extraction section, and the extracted water phase (containing nickel) flows into the inlet of the nickel separation reaction tank 21 through the first outlet of the ion exchange equipment 15 (namely, the first outlet of the ion exchange equipment 15 is communicated with the inlet of the nickel separation reaction tank 21 through a pipeline). And continuously back extracting the organic phase (containing zinc and manganese) in the integrated equipment, and entering a back extraction section. The stripped aqueous phase (containing zinc and manganese) flows into a zinc separation reaction tank 16 through a second outlet of the ion exchange device 15 (namely, the second outlet of the ion exchange device 15 is communicated with an inlet of the zinc separation reaction tank 16 through a pipeline). The outlet of the nickel separation reaction tank 21 is communicated with the inlet of a nickel separation filter press 23, and the outlet of the sodium carbonate dosing tank 22 is communicated with the reagent inlet of the nickel separation reaction tank 21. The pipeline between the sodium carbonate dosing tank 22 and the nickel separation reaction tank 21 and the pipeline between the nickel separation reaction tank 21 and the nickel separation filter press 23 are both provided with a pump 1, and the solid material outlet of the nickel separation filter press 23 is communicated with a nickel recovery discharge channel F. The outlet of the zinc separation reaction tank 16 is communicated with the inlet of the zinc separation filter press 17 through a pipeline, the liquid material outlet of the zinc separation filter press 17 is communicated with the inlet of the manganese separation reaction tank 18 through a pipeline, and the solid material outlet of the zinc separation filter press 17 is communicated with the zinc recovery discharge channel G. The outlet of the manganese separation reaction tank 18 is communicated with the inlet of the manganese separation filter press 19 through a pipeline, and the solid material outlet of the manganese separation filter press 19 is communicated with the manganese recovery discharge channel H. The liquid caustic soda dosing tank 20 is communicated with a reagent inlet of the zinc separation reaction tank 16 through a pipeline, and is communicated with a reagent inlet of the manganese separation reaction tank 18.
The liquid material that flows out from the outlet of copper separation filter press 10 firstly enters intermediate tank 14 for temporary storage, then the material flows into ion exchange equipment 15, after extraction, the nickel-containing liquid material flows into nickel separation reaction tank 21, sodium carbonate solution (from sodium carbonate dosing tank 22) is added into nickel separation reaction tank 21, then the material enters nickel separation filter press 23, after filtration and separation, nickel-containing filter cake (needing to be collected) is obtained from nickel recovery discharge passage F, and the wastewater that flows out from the liquid material outlet of nickel separation filter press 23 needs to be subjected to subsequent harmless treatment. In addition, after extraction, the liquid material containing zinc and manganese flows into the back-extraction column, impurities are further removed through extraction in the back-extraction column, and the purified liquid material containing zinc and manganese flows out of the outlet of the back-extraction column and flows into the zinc separation reaction tank 16. Adding alkali liquor (provided by a liquid alkali dosing tank 20) into a zinc separation reaction tank 16, then feeding the materials into a zinc separation filter press 17, and obtaining a zinc-containing filter cake (needing to be collected) in a zinc recovery discharge channel G after filtration and separation. The liquid material continuously flows into a manganese separation reaction tank 18 from a liquid material outlet of a zinc separation filter press 17, alkali liquor (provided by a liquid alkali dosing tank 20) is added into the manganese separation reaction tank 18, then the material enters a manganese separation filter press 19, and after filtration and separation, a manganese-containing filter cake (required to be collected) is obtained in a manganese recovery discharge channel H. The waste liquid flows out from the liquid material outlet of the manganese separation filter press 19 and needs to be subjected to subsequent harmless treatment.
In this embodiment, the used apparatuses are conventional apparatuses in the prior art in the chemical industry field: the pulping tank 4 and the pulp intermediate tank 5 may be selected from pulping tanks commonly used in the art. The acid leaching reaction tank 6 can be selected from acid leaching tanks commonly used in the field. The gypsum purification tank 8, the copper displacement reaction tank 9, the zinc separation reaction tank 16, the manganese separation reaction tank 18 and the nickel separation reaction tank 21 may be reaction tanks commonly used in the art. The acid leaching filter press 7, the copper separation filter press 10, the zinc separation filter press 17, the manganese separation filter press 19, and the nickel separation filter press 23 may be filter presses commonly used in the art (for example, filter presses of type XMZGJ 60-800-UK). The general working flow of the existing filter press is as follows: the material mixed with solid and liquid enters the filter press through the inlet of the filter press, the solid and liquid separation of the material is realized in the filter press, the liquid part is output from the liquid material outlet, and the solid part (becoming filter cake) is output from the solid material outlet. The liquid caustic soda dosing tank 20 and the sodium carbonate dosing tank 22 can be auxiliary material preparation tanks commonly used in the field; the dilute sulfuric acid storage tank 2, the concentrated sulfuric acid storage tank 3 and the intermediate tank 14 can be liquid storage tanks commonly used in the field. The ion exchange unit 15 is a box type extraction unit commonly used in the prior art, and comprises a saponification section (using 30% sodium hydroxide), an extraction section (using P204 extractant), and a stripping section (using 20% dilute sulfuric acid). The saponification stage uses a CWL350-M centrifugal extractor, which treats the material (from the intermediate tank 14) with 30% sodium hydroxide, the inlet of the saponification stage being connected to the intermediate tank 14. Then the material flows out from the outlet of the saponification section to the inlet of the extraction section. The extraction section uses a CWL350-M centrifugal extractor, the material (from the saponification section) is treated by using a P204 extractant, after the extraction treatment is layered (separated into an aqueous phase and an organic phase), the aqueous phase (containing nickel) flows into the inlet of the nickel separation reaction tank 21 through the first outlet (the aqueous phase outlet of the extraction section) of the ion exchange device 15. The organic phase flows out to the inlet of the stripping section through the organic phase outlet of the extraction section, the stripping section also uses a CWL350-M centrifugal extractor, 20% dilute sulfuric acid is used for processing the material (from the extraction section), after the stripping processing and layering are completed (the material is divided into an aqueous phase and an organic phase), the aqueous phase (containing zinc and manganese) flows into the zinc separation reaction tank 16 through the second outlet (namely the aqueous phase outlet of the stripping section) of the ion exchange equipment 15.
In conclusion, calcium, copper, nickel, zinc and manganese in the sludge can be recovered through the treatment of the pulping unit, the gypsum and copper separation unit and the nickel-zinc-manganese separation unit. The system is very suitable for treating and recovering sludge containing a large amount of calcium, copper, nickel, zinc and manganese, and realizes the recovery of renewable resources and the treatment of environmental pollution.
Example 2
The present embodiment is basically the same as embodiment 1, except that as shown in fig. 4, the heavy metal-containing sludge treatment system further includes a reuse water unit. The reuse water unit comprises a circulating water tank 11, a crystallizing tank 12 and a centrifuge 13, wherein a liquid material outlet of a manganese separation filter press 19 is communicated with an inlet of the circulating water tank 11 through a wastewater feeding pipe D, and a liquid material outlet of a nickel separation filter press 23 is also communicated with an inlet of the circulating water tank 11 through the wastewater feeding pipe D. The outlet of the circulating water tank 11 is communicated with the inlet of the crystallizing tank 12 through a pipeline, the outlet of the crystallizing tank 12 is communicated with the inlet of the centrifuge 13 through a pipeline, and the outlet of the centrifuge 13 is communicated with the water inlet pipe B of the pulping unit through a recycled water discharging pipe E. The circulation water tank 11 temporarily stores the wastewater, then in the crystallization tank 12, the wastewater is cooled to 20 ℃ by using circulation liquid (refrigerant), sodium sulfate crystals are separated out, then the liquid material is sent to a centrifuge 13 for centrifugal treatment, the liquid obtained by centrifugation is recycled water, and the recycled water is input into the pulping tank 4 to be used as the material for pulping. In the scheme, the waste water generated in the system is recycled, so that the energy is saved and the material utilization rate is improved.
In this embodiment, the circulation water tank 11 (a kind of water storage tank), the crystallization tank 12, and the centrifuge 13 are conventional devices in the chemical industry field.
Example 3
In this example, basically the same as example 2, except for the difference shown in fig. 5, an iron separation reaction tank 24 and an iron separation filter press 25 are further provided between the intermediate tank 14 and the copper separation filter press 10. Because a certain amount of iron powder is added into the copper displacement reaction tank 9 to displace copper, a certain amount of iron ions remain in the material, which affects the subsequent extraction, back-extraction and precipitation processes. The liquid material outlet of the copper separation filter press 10 is communicated with the inlet of the iron separation reaction tank 24 through a pipeline, the outlet of the iron separation reaction tank 24 is communicated with the material inlet of the iron separation filter press 25 through a pipeline, and the liquid material outlet of the iron separation filter press 25 is communicated with the inlet of the intermediate tank 14 through a pipeline. An iron-containing filter cake is produced in the solid material outlet of the iron separation filter press 25. The iron separating filter press 25 is a filter press conventional in the art, see information on the filter press in example 1, and the iron separating reaction tank 24 is also a filter press conventional in the art, see information on the reaction tank in example 1.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the embodiments and that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention. These should also be considered as the scope of protection of the present invention, and these do not affect the effect of the implementation of the present invention and the utility of the patent. The techniques, shapes, and structural parts, which are omitted from the description of the present invention, are all known techniques.
Claims (10)
1. The heavy metal-containing sludge treatment system is characterized by comprising a pulping unit, a gypsum and copper separation unit and a nickel-zinc-manganese separation unit which are sequentially connected; the nickel-zinc-manganese separation unit comprises ion exchange equipment, a zinc separation reaction tank and a nickel separation reaction tank; a first outlet of the ion exchange equipment is communicated with an inlet of the nickel separation reaction tank, a second outlet of the ion exchange equipment is communicated with an inlet of the zinc separation reaction tank, and an inlet of the ion exchange equipment is communicated with the gypsum and copper separation unit; the zinc separation reaction tank is communicated with a zinc separation filter press, a liquid material outlet of the zinc separation filter press is communicated with a manganese separation reaction tank, and the manganese separation reaction tank is communicated with a manganese separation filter press; the nickel separation reaction tank is communicated with an inlet of a nickel separation filter press; the nickel-zinc-manganese separation unit also comprises a sodium carbonate dosing tank for adding a reagent to the nickel separation reaction tank and a liquid caustic soda dosing tank for adding a reagent to the nickel separation reaction tank.
2. The heavy metal-containing sludge treatment system according to claim 1, further comprising a reuse water unit.
3. The heavy metal-containing sludge treatment system according to claim 2, wherein the pulping unit comprises a pulping tank and a slurry intermediate tank which are connected in sequence; the pulping unit further comprises a dilute sulfuric acid storage tank for adding dilute sulfuric acid to the pulping tank.
4. The heavy metal-containing sludge treatment system according to claim 3, wherein the gypsum and copper separation unit comprises an acid leaching reaction tank, an acid leaching filter press, a gypsum purification tank, a copper replacement reaction tank, a copper separation filter press and a concentrated sulfuric acid storage tank; an outlet of the slurry intermediate tank is communicated with an inlet of an acid leaching reaction tank, an outlet of the acid leaching reaction tank is communicated with an inlet of an acid leaching filter press, a solid material outlet of the acid leaching filter press is communicated with an inlet of a gypsum purification tank, a liquid material outlet of the acid leaching filter press is communicated with an inlet of a copper replacement reaction tank, and an outlet of the copper replacement reaction tank is communicated with an inlet of a copper separation filter press; the concentrated sulfuric acid storage tank is used for adding concentrated sulfuric acid into the acid leaching reaction tank.
5. The heavy metal-containing sludge treatment system according to claim 4, wherein the reuse water unit comprises a circulation water tank, a crystallization tank and a centrifuge; the outlet of the circulating water tank is communicated with the inlet of the crystallizing tank, the outlet of the crystallizing tank is communicated with the inlet of the centrifugal machine, and the outlet of the centrifugal machine is communicated with the water inlet of the pulping tank.
6. The heavy metal-containing sludge treatment system according to claim 5, wherein the inlet of the ion exchange device is communicated with the outlet of the intermediate tank, and the liquid material outlet of the copper separation filter press is communicated with the inlet of the intermediate tank.
7. The heavy metal-containing sludge treatment system of claim 6 wherein the outlet of the slurry intermediate tank is in communication with the inlet of the acid leaching reaction tank.
8. The heavy metal-containing sludge treatment system according to claim 7, wherein the inlet of the circulation water tank is communicated with the liquid material outlet of the nickel separation filter press, and the inlet of the circulation water tank is communicated with the liquid material outlet of the manganese separation filter press.
9. The heavy metal-containing sludge treatment system according to claim 8, wherein the solid material outlet of the copper separation filter press is communicated with a copper recovery discharge channel; a solid material outlet of the zinc separation filter press is communicated with a zinc recovery discharge channel; a solid material outlet of the manganese separation filter press is communicated with a manganese recovery discharge channel; and a solid material outlet of the nickel separation filter press is communicated with a nickel recovery discharge channel.
10. The heavy metal-containing sludge treatment system according to claim 9, wherein an iron reaction tank and an iron separation filter press are further provided between the copper separation filter press and the intermediate tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022479466.8U CN214004387U (en) | 2020-10-30 | 2020-10-30 | Heavy metal-containing sludge treatment system |
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| CN202022479466.8U CN214004387U (en) | 2020-10-30 | 2020-10-30 | Heavy metal-containing sludge treatment system |
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| CN214004387U true CN214004387U (en) | 2021-08-20 |
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