CN212955279U - Recovery unit who contains chromium aluminiferous mud - Google Patents
Recovery unit who contains chromium aluminiferous mud Download PDFInfo
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- CN212955279U CN212955279U CN202021249228.1U CN202021249228U CN212955279U CN 212955279 U CN212955279 U CN 212955279U CN 202021249228 U CN202021249228 U CN 202021249228U CN 212955279 U CN212955279 U CN 212955279U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The utility model provides a recovery unit of mud containing chromium and aluminiferous, the recovery unit of mud containing chromium and aluminiferous includes first making beating ware, first alkali adding device, electrolysis trough, first solid-liquid separation equipment, sodium aluminate storage device, second making beating ware, second alkali adding device, second solid-liquid separation equipment, sodium chromate storage device and chromium and aluminium removal mud storage device; recovery unit makes aluminium and chromium among the mud that contains chromium aluminiferous retrieve respectively through the cooperation of two making beating and electrolysis trough middle cathode chamber and anode chamber, and sodium aluminate's filtrating is saved in sodium aluminate storage device, and sodium chromate's filtrating is saved in sodium chromate storage device to gained, and dechromization removes aluminium mud and then gets into dechromization and removes aluminium mud storage device in order to carry out subsequent processing.
Description
Technical Field
The utility model belongs to the technical field of the resource recovery, a recovery unit of chromium and aluminium is related to, especially relate to a recovery unit who contains chromium aluminiferous mud.
Background
The production of chromium salt by using chromite as a raw material is an important component in the inorganic salt industry, relates to a plurality of industrial fields such as pigment, tanning, medicine, light textile and the like, and the production of chromium salt occupies a very important position in the modern national economy of China.
The industrial waste water and waste residue produced in the process of producing chromate by soda roasting method seriously pollute the environment, so the clean production process of chromate needs to be researched. The chromium-containing aluminum mud is main waste residue generated in the process of producing chromate by taking chromite as a raw material, is a main product generated in the process of neutralizing and removing aluminum by using sodium chromate alkaline solution and sodium dichromate mother liquor or sulfuric acid, phosphoric acid and the like, contains about 10 wt% of Al, about 10 wt% of Cr, Si, Fe and other impurities, wherein most of Cr exists in the form of hexavalent chromium, causes serious harm to the surrounding environment, and needs to be subjected to harmless treatment before being discharged.
The mud containing chromium and aluminum is detoxicated, that is, hexavalent chromium in the mud containing chromium and aluminum is converted into trivalent chromium, and sludge containing aluminum hydroxide and chromium hydroxide is obtained. The sludge containing aluminum hydroxide and chromium hydroxide is the sludge containing chromium and aluminum of the utility model.
CN 101063184A discloses a process for recovering chromium and aluminum by comprehensively treating chromium-containing aluminum mud, wherein a washing solution containing hexavalent chromium is added into the chromium-containing aluminum mud, the liquid-solid ratio is controlled to dispergate the chromium-containing aluminum mud, the dispergated slurry is subjected to liquid-solid separation to obtain a filtrate containing hexavalent chromium, the filtrate is evaporated and concentrated and is returned to the chromium salt production process, and the filter cake is subjected to reverse washing for 2-3 times to obtain chromium-removed aluminum mud; slurrying the chromium-removed aluminum mud in evaporation mother liquor, controlling the granularity of-100 meshes of ions to be more than 95 percent, and simultaneously adding industrial-grade Na2S, then carrying out heat preservation dissolution on the pulping liquid, adding a flocculating agent into the dissolved pulp, separating compounds containing silicon, iron and trivalent chromium, cleaning residues, returning the residues to the chromium salt production process, and recovering the trivalent chromium; and (4) performing seed crystal decomposition on the sodium aluminate solution subjected to settling separation by using a Bayer process to obtain an aluminum hydroxide product. The process needs to add hexavalent chromium and sodium sulfide additionally and recover chromium and aluminumThe cost is increased in the process, and the subsequent treatment of solid waste is not facilitated.
CN 101891251A discloses an alkali method recycling process for chromium-containing aluminum mud, the recycling process comprises the steps of firstly adding water into the chromium-containing aluminum mud for pulping, adding sodium hydroxide until the pH value is more than or equal to 10.8, adding a reducing agent into the pulp, and heating and boiling to generate dark green precipitates; filtering; washing the filter cake with hot water of 50 deg.C or higher, adding acid to neutralize, washing with hot water, filtering to obtain the filter cake Cr (OH)3(ii) a Acidifying the filtrate with acid, filtering, neutralizing the filtrate with alkali to obtain white precipitate, washing, and drying to obtain Al (OH)3And (5) producing the product. However, the recycling process is used for dissolving aluminum at high temperature, and chromium is slightly leached in the process, so that the separation of aluminum and chromium is influenced.
CN 104805288A discloses a process method for recovering chromium and aluminum by comprehensively utilizing aluminum mud waste, which takes chromium-aluminum waste mud as a raw material, and sodium chromate solution is obtained by separation through processes such as pulping, washing, electrodialysis and the like and is used for producing sodium dichromate products; dissolving the aluminum mud subjected to dechromization treatment by using a NaOH solution, and carrying out continuous carbonation for multiple times to obtain a high-purity metallurgical-grade aluminum oxide product. The electrodialysis is to use an electrodialysis device to carry out electrodialysis on the aluminum mud subjected to preliminary chromium removal as a raw material for electrodialysis, wherein the cathode chamber and the anode chamber are sodium chromate solutions returned to the chromium salt production process, and sediments obtained in the middle chamber are aluminum mud residues subjected to complete chromium removal. The process method has high energy consumption and is only suitable for treating the mixed sludge containing hexavalent chromium and aluminum hydroxide.
Therefore, the utility model provides a recovery unit who contains chromium aluminiferous mud, the recovery unit simple structure who contains chromium aluminiferous mud only utilizes the difference of chromium and aluminium dissolving property in alkaline solution to realize the separation of chromium and aluminium in the mud that contains chromium aluminiferous, is convenient for to the innoxious and resourceful treatment that contains chromium aluminiferous mud.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and aims to provide a recovery device for sludge containing chromium and aluminum, which enables the sludge containing chromium and aluminum to simply recover aluminum and chromium in the sludge under the recovery device with simple structure, thereby realizing low cost, harmless treatment and resource treatment of the sludge containing chromium and aluminum.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a recovery unit of mud containing chromium and aluminiferous, the recovery unit of mud containing chromium and aluminiferous includes first making beating ware, first alkali adding device, electrolysis trough, first solid-liquid separation equipment, sodium aluminate storage device, second making beating ware, second alkali adding device, second solid-liquid separation equipment, sodium chromate storage device and chromium and aluminium removal mud storage device;
a supply pipeline of the chromium-containing and aluminum-containing sludge and a discharge port of the first alkalization device are respectively and independently connected with a feed inlet of the first pulping device; the discharge hole of the first pulping device is connected with the cathode chamber of the electrolytic cell; a slurry outlet of the cathode chamber of the electrolytic cell is connected with a first solid-liquid separation device, a liquid outlet of the first solid-liquid separation device is connected with a sodium aluminate storage device, and a solid outlet of the first solid-liquid separation device is connected with a second pulping device; the feed inlet of the second beater is also connected with a second alkali adding device, and the discharge outlet of the second beater is connected with the anode chamber of the electrolytic cell; the slurry outlet of the anode chamber of the electrolytic cell is connected with a second solid-liquid separation device, the liquid outlet of the second solid-liquid separation device is connected with a sodium chromate storage device, and the solid outlet of the second solid-liquid separation device is connected with a chromium and aluminum removing sludge storage device.
Use the utility model provides a when recovery unit handles chromium-containing aluminiferous mud, chromium-containing aluminiferous mud mixes in first pulping apparatus with the alkaline material that first alkali adding device provided, the mixture gets into the cathode chamber in the electrolysis trough, because the effect of reduction potential in the cathode chamber, it exists with the form of trivalent chromium to have guaranteed chromium in the mixture, and trivalent chromium is different with the solubility of aluminium in alkaline solution, consequently contain a large amount of sodium aluminate in the thick liquid through cathode chamber electrolytic reduction processing, sodium chromate content is extremely low, consequently, the content of sodium chromate in the sodium aluminate solution that obtains through the separation of first solid-liquid separation equipment is lower, carry out conventional subsequent processing after getting into the sodium aluminate storage device, can obtain the higher sodium aluminate product of purity; and the chromium-containing slurry is mixed with alkaline substances provided by a second alkali adding device in a second pulping device, the mixed material enters an anode chamber of an electrolytic cell, chromium hydroxide in the mixed material is converted into sodium chromate under the action of electrolytic oxidation of the anode chamber, and the chromium-removed and aluminum-removed sludge and the solution containing the sodium chromate are obtained after solid-liquid separation is carried out by a second solid-liquid separation device.
Recovery unit's simple structure utilizes chromium and aluminium different in alkaline solution solubility, only can realize the separation of chromium and aluminium among the chromium-containing aluminiferous mud through the setting of electrolysis trough, has realized low-cost, harmless and the resourceful treatment who contains chromium-containing aluminiferous mud.
The first pulping device of the utility model comprises but is not limited to a pulping tank; the second beater includes, but is not limited to, a beater tank; the sodium aluminate storage device comprises but is not limited to a sodium aluminate storage tank and/or a sodium aluminate storage tank; the sodium chromate storage means includes, but is not limited to, a sodium chromate storage tank and/or a sodium chromate storage tank; the dechromization and dealuminization sludge storage device comprises a dechromization and dealuminization sludge storage tank and/or a dechromization and dealuminization sludge storage tank.
Preferably, the cathode chamber of the electrolytic cell is provided with a temperature reduction heat exchanger and a matched temperature control member.
The cooling heat exchanger comprises a coil pipe heat exchanger and/or a jacket heat exchanger, and the refrigerant used in the heat exchanger is a conventional refrigerant in the field as long as the temperature of the cathode chamber can be 5-25 ℃; the temperature control piece is a conventional temperature control piece in the field, and the temperature control piece can adjust the flow of a refrigerant in the cooling heat exchanger according to the temperature in the cathode chamber, so that the temperature in the cathode chamber meets the process requirement.
The dissolution performance of trivalent chromium in an alkaline solution is greatly influenced by temperature, and the difference of the dissolution performance of trivalent chromium and aluminum is increased under the condition of low temperature, so that the content of sodium chromate in the slurry of the cathode chamber electrolytic reduction treatment is further reduced.
Preferably, the anode chamber of the electrolytic cell is provided with a temperature-rising heat exchanger and a matched temperature control piece.
The heating heat exchanger comprises a coil heat exchanger and/or a jacket heat exchanger, the heating medium used in the heat exchanger is the conventional heating medium in the field, and the heating medium only needs to enable the temperature of the anode chamber to be 60-95 ℃; the temperature control piece is a conventional temperature control piece in the field, and the temperature control piece can adjust the flow of a heating medium in the heating heat exchanger according to the temperature in the anode chamber, so that the temperature in the anode chamber meets the process requirement.
Preferably, the anode used in the electrolytic cell comprises any one of a titanium anode, a graphite anode or a lead-antimony alloy anode.
Preferably, the cathode used in the electrolytic cell comprises any one of a titanium cathode, a graphite cathode, a lead-antimony alloy cathode or a stainless steel cathode.
Preferably, the diaphragm used in the electrolytic cell is an anion exchange membrane.
Preferably, the first alkali adding device is an alkali liquor adding device.
Preferably, the second alkali adding device is an alkali liquor adding device.
The alkali liquor adding device comprises an alkali liquor storage tank and an alkali liquor delivery pump, wherein the first alkali adding device and the second alkali adding device add alkali liquor according to the contents of chromium and aluminum in the sludge containing chromium and aluminum; the alkali liquor comprises sodium hydroxide solution and/or potassium hydroxide solution, preferably sodium hydroxide solution.
Preferably, the first solid-liquid separation device comprises a wash filter press.
Preferably, the second solid-liquid separation device comprises a wash filter press.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model uses the electrolytic tank to extract aluminum firstly and then chromium, the aluminum is extracted in the cathode chamber, the chromium is extracted in the anode chamber, and the aluminum and the chromium in the sludge containing chromium and aluminum have better separation effect;
(2) the utility model provides a recovery unit who contains chromium aluminiferous mud's simple structure can realize low-cost, innoxious and resourceful treatment to containing chromium aluminiferous mud.
Drawings
FIG. 1 is a schematic structural diagram of a recycling device for sludge containing chromium and aluminum provided by the present invention.
Wherein: 1, a first pulping device; 2.1, a first alkali adding device; 2.2, a second alkali adding device; 3.1, cooling the heat exchanger; 3.2, heating a heat exchanger; 4.1, a first solid-liquid separation device; 4.2, a second solid-liquid separation device; 5, a sodium aluminate storage device; 6, a second beater; 7, a sodium chromate storage device; and 8, a chromium and aluminum removing sludge storage device.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As the utility model discloses a chromium aluminiferous sludge's recovery unit's preferred technical scheme, chromium aluminiferous sludge's recovery unit's that contains structural schematic diagram is shown in figure 1, including first making beating ware 1, first alkali device 2.1, electrolysis trough, first solid-liquid separation equipment 4.1, sodium aluminate storage device 5, second making beating ware 6, second alkali device 2.2, second solid-liquid separation equipment 4.2, sodium chromate storage device 7 and chromium removal aluminium sludge storage device 8 that adds.
A supply pipeline of the sludge containing chromium and aluminum and a discharge port of the first alkali adding device 2.1 are respectively and independently connected with a feed port of the first pulping device 1; the discharge port of the first beater 1 is connected with the cathode chamber of the electrolytic cell; a slurry outlet of the cathode chamber of the electrolytic cell is connected with a first solid-liquid separation device 4.1, a liquid outlet of the first solid-liquid separation device 4.1 is connected with a sodium aluminate storage device 5, and a solid outlet of the first solid-liquid separation device 4.1 is connected with a second pulping device 6; the feed inlet of the second beater 6 is also connected with a second alkali adding device 2.2, and the discharge outlet of the second beater 6 is connected with the anode chamber of the electrolytic cell; the slurry outlet of the anode chamber of the electrolytic cell is connected with a second solid-liquid separation device 4.2, the liquid outlet of the second solid-liquid separation device 4.2 is connected with a sodium chromate storage device 7, and the solid outlet of the second solid-liquid separation device 4.2 is connected with a chromium and aluminum removing sludge storage device 8.
A cathode chamber of the electrolytic cell is provided with a cooling heat exchanger 3.1 and a matched temperature control member; and the anode chamber of the electrolytic cell is provided with a heating heat exchanger 3.2 and a matched temperature control member. The first alkali adding device 2.1 is an alkali liquor adding device; the second alkali adding device 2.2 is an alkali liquor adding device.
The anode used by the electrolytic cell comprises any one of a titanium anode, a graphite anode or a lead-antimony alloy anode; the cathode used by the electrolytic cell comprises any one of a titanium cathode, a graphite cathode, a lead-antimony alloy cathode or a stainless steel cathode; the diaphragm used by the electrolytic cell is an anion exchange membrane.
The first solid-liquid separation device 4.1 is a washing filter press; the second solid-liquid separation device 4.2 is a washing filter press.
Example 1
The embodiment provides a recovery unit of mud containing chromium and aluminiferous, the recovery unit of mud containing chromium and aluminiferous includes first making beating ware 1, first alkali device 2.1, electrolysis trough, first solid-liquid separation equipment 4.1, sodium aluminate storage device 5, second making beating ware 6, second alkali device 2.2, second solid-liquid separation equipment 4.2, sodium chromate storage device 7 and dechromization aluminium-removing mud storage device 8.
A supply pipeline of the sludge containing chromium and aluminum and a discharge port of the first alkali adding device 2.1 are respectively and independently connected with a feed port of the first pulping device 1; the discharge port of the first beater 1 is connected with the cathode chamber of the electrolytic cell; a slurry outlet of the cathode chamber of the electrolytic cell is connected with a first solid-liquid separation device 4.1, a liquid outlet of the first solid-liquid separation device 4.1 is connected with a sodium aluminate storage device 5, and a solid outlet of the first solid-liquid separation device 4.1 is connected with a second pulping device 6; the feed inlet of the second beater 6 is also connected with a second alkali adding device 2.2, and the discharge outlet of the second beater 6 is connected with the anode chamber of the electrolytic cell; the slurry outlet of the anode chamber of the electrolytic cell is connected with a second solid-liquid separation device 4.2, the liquid outlet of the second solid-liquid separation device 4.2 is connected with a sodium chromate storage device 7, and the solid outlet of the second solid-liquid separation device 4.2 is connected with a chromium and aluminum removing sludge storage device 8.
The cathode chamber of the electrolytic cell is provided with a cooling heat exchanger 3.1 and a matched temperature control member, and the cooling heat exchanger 3.1 is a coil heat exchanger. The anode chamber of the electrolytic cell is provided with a temperature-rising heat exchanger 3.2 and a matched temperature control piece, and the temperature-rising heat exchanger 3.2 is a coil heat exchanger.
The anode used by the electrolytic cell is a titanium anode; the cathode used by the electrolytic cell is a graphite cathode; the diaphragm used by the electrolytic cell is an anion exchange membrane.
The first alkali adding device 2.1 is an alkali liquor adding device and comprises an alkali liquor storage tank and an alkali liquor delivery pump; the second alkali adding device 2.2 is an alkali liquor adding device and comprises an alkali liquor storage tank and an alkali liquor delivery pump.
The first solid-liquid separation device 4.1 is a washing filter press and the second solid-liquid separation device 4.2 is a washing filter press.
When the recovery device provided by the embodiment is used for treating the sludge containing chromium and aluminum, the sludge containing chromium and aluminum and the alkaline substances provided by the first alkali adding device 2.1 are mixed in the first beater 1, the mixed material enters a cathode chamber in an electrolytic cell, the temperature in the cathode chamber is controlled to be 5-20 ℃ by the cooling heat exchanger 3.1, the chromium in the mixed material is ensured to exist in the form of trivalent chromium due to the action of the reduction potential in the cathode chamber, and the dissolving performance of the trivalent chromium in an alkaline solution is poor, so that the slurry subjected to electrolytic reduction treatment in the cathode chamber contains a large amount of sodium aluminate and has extremely low sodium chromate content.
Therefore, the sodium chromate content in the sodium aluminate solution obtained by the separation of the first solid-liquid separation device 4.1 is low, and the sodium aluminate solution enters the sodium aluminate storage device 5 and then is subjected to conventional subsequent treatment to obtain a sodium aluminate product with high purity; and the chromium-containing slurry is mixed with alkaline substances provided by a second alkali adding device 2.2 in a second pulping device 6, the mixed material enters an anode chamber of an electrolytic cell, a temperature rising heat exchanger 3.2 enables the temperature in the anode chamber to be 60-80 ℃, chromium hydroxide in the mixed material is converted into sodium chromate under the action of electrolytic oxidation of the anode chamber, the chromium-removed and aluminum-removed sludge and a solution containing sodium chromate are obtained after solid-liquid separation is carried out by a second solid-liquid separation device 4.2, the chromium-removed and aluminum-removed sludge enters a chromium-removed primary filter sludge storage device 8, the solution containing sodium chromate enters a sodium chromate storage device 7 and then is subjected to conventional subsequent treatment, and a sodium chromate product with high purity can be obtained.
Example 2
The embodiment provides a recovery unit of mud containing chromium and aluminiferous, the recovery unit of mud containing chromium and aluminiferous includes first making beating ware 1, first alkali device 2.1, electrolysis trough, first solid-liquid separation equipment 4.1, sodium aluminate storage device 5, second making beating ware 6, second alkali device 2.2, second solid-liquid separation equipment 4.2, sodium chromate storage device 7 and dechromization aluminium-removing mud storage device 8.
A supply pipeline of the sludge containing chromium and aluminum and a discharge port of the first alkali adding device 2.1 are respectively and independently connected with a feed port of the first pulping device 1; the discharge port of the first beater 1 is connected with the cathode chamber of the electrolytic cell; a slurry outlet of the cathode chamber of the electrolytic cell is connected with a first solid-liquid separation device 4.1, a liquid outlet of the first solid-liquid separation device 4.1 is connected with a sodium aluminate storage device 5, and a solid outlet of the first solid-liquid separation device 4.1 is connected with a second pulping device 6; the feed inlet of the second beater 6 is also connected with a second alkali adding device 2.2, and the discharge outlet of the second beater 6 is connected with the anode chamber of the electrolytic cell; the slurry outlet of the anode chamber of the electrolytic cell is connected with a second solid-liquid separation device 4.2, the liquid outlet of the second solid-liquid separation device 4.2 is connected with a sodium chromate storage device 7, and the solid outlet of the second solid-liquid separation device 4.2 is connected with a chromium and aluminum removing sludge storage device 8.
The cathode chamber of the electrolytic cell is provided with a cooling heat exchanger 3.1 and a matched temperature control member, and the cooling heat exchanger 3.1 is a jacket heat exchanger. The anode chamber of the electrolytic cell is provided with a temperature-rising heat exchanger 3.2 and a matched temperature control piece, and the temperature-rising heat exchanger 3.2 is a jacket heat exchanger.
The anode used by the electrolytic cell is a graphite anode; the cathode used by the electrolytic cell is a stainless steel cathode; the diaphragm used by the electrolytic cell is an anion exchange membrane.
The first alkali adding device 2.1 is an alkali liquor adding device and comprises an alkali liquor storage tank and an alkali liquor delivery pump; the second alkali adding device 2.2 is an alkali liquor adding device and comprises an alkali liquor storage tank and an alkali liquor delivery pump.
The first solid-liquid separation device 4.1 is a washing filter press and the second solid-liquid separation device 4.2 is a washing filter press.
Use the utility model provides a when recovery unit handles chromium containing aluminiferous mud, chromium containing aluminiferous mud mixes in first making beating ware 1 with the alkaline material that first alkali adding device 2.1 provided, the misce bene gets into the cathode chamber in the electrolysis trough, cooling heat exchanger 3.1 makes the indoor temperature of cathode be 5-20 ℃, because the effect of reduction potential in the cathode chamber, it exists with trivalent chromium's form to have guaranteed the chromium in the misce bene, and trivalent chromium is relatively poor in the solubility ability of alkaline solution, consequently contain a large amount of sodium aluminate in the aqueous solution of the thick liquid of process of cathode chamber electrolytic reduction, sodium chromate content is extremely low.
Therefore, the sodium chromate content in the sodium aluminate solution obtained by the separation of the first solid-liquid separation device 4.1 is low, and the sodium aluminate solution enters the sodium aluminate storage device 5 and then is subjected to conventional subsequent treatment to obtain a sodium aluminate product with high purity; and the chromium-containing slurry is mixed with alkaline substances provided by a second alkali adding device 2.2 in a second pulping device 6, the mixed material enters an anode chamber of an electrolytic cell, a temperature rising heat exchanger 3.2 enables the temperature in the anode chamber to be 60-80 ℃, chromium hydroxide in the mixed material is converted into sodium chromate under the action of electrolytic oxidation of the anode chamber, the chromium-removed and aluminum-removed sludge and a solution containing sodium chromate are obtained after solid-liquid separation is carried out by a second solid-liquid separation device 4.2, the chromium-removed and aluminum-removed sludge enters a chromium-removed primary filter sludge storage device 8, the solution containing sodium chromate enters a sodium chromate storage device 7 and then is subjected to conventional subsequent treatment, and a sodium chromate product with high purity can be obtained.
In summary, the utility model uses the electrolytic cell to extract aluminum and chromium, the aluminum is extracted in the cathode chamber, the chromium is extracted in the anode chamber, and the aluminum and chromium in the sludge containing chromium and aluminum have better separation effect; the recovery device has simple structure, and can realize low-cost, harmless and resource treatment of the sludge containing chromium and aluminum.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. The device for recovering the sludge containing chromium and aluminum is characterized by comprising a first pulping device, a first alkali adding device, an electrolytic bath, a first solid-liquid separation device, a sodium aluminate storage device, a second pulping device, a second alkali adding device, a second solid-liquid separation device, a sodium chromate storage device and a chromium and aluminum removing sludge storage device;
the feeding pipeline of the chromium-containing and aluminum-containing sludge and the discharge port of the first alkalization device are respectively and independently connected with the feed inlet of the first pulping device; the discharge hole of the first pulping device is connected with the cathode chamber of the electrolytic cell; a slurry outlet of the cathode chamber of the electrolytic cell is connected with a first solid-liquid separation device, a liquid outlet of the first solid-liquid separation device is connected with a sodium aluminate storage device, and a solid outlet of the first solid-liquid separation device is connected with a second pulping device; the feed inlet of the second beater is also connected with a second alkali adding device, and the discharge outlet of the second beater is connected with the anode chamber of the electrolytic cell; the slurry outlet of the anode chamber of the electrolytic cell is connected with a second solid-liquid separation device, the liquid outlet of the second solid-liquid separation device is connected with a sodium chromate storage device, and the solid outlet of the second solid-liquid separation device is connected with a chromium and aluminum removing sludge storage device.
2. The recycling device of sludge containing chromium and aluminum as claimed in claim 1, wherein the cathode chamber of the electrolytic cell is provided with a temperature reduction heat exchanger and a matched temperature control member.
3. The recycling device of sludge containing chromium and aluminum according to claim 2, wherein the anode chamber of the electrolytic cell is provided with a temperature-rising heat exchanger and a matched temperature control member.
4. The recycling apparatus for sludge containing chromium and aluminum according to claim 1, wherein the anode used in the electrolytic cell comprises any one of a titanium anode, a graphite anode or a lead-antimony alloy anode.
5. The recycling apparatus for sludge containing chromium and aluminum according to claim 4, wherein the cathode used in the electrolytic cell comprises any one of a titanium cathode, a graphite cathode, a lead-antimony alloy cathode or a stainless steel cathode.
6. The apparatus for recovering sludge containing chromium and aluminum as claimed in claim 4 or 5, wherein the diaphragm used in the electrolytic cell is an anion exchange membrane.
7. The recycling device of sludge containing chromium and aluminum according to claim 1, wherein said first alkali adding device is an alkali liquid adding device.
8. The recycling device of sludge containing chromium and aluminum according to claim 7, wherein said second alkali adding device is an alkali liquid adding device.
9. The apparatus for recovering sludge containing chromium and aluminum according to claim 1, wherein the first solid-liquid separation apparatus comprises a washing filter press.
10. The apparatus for recovering sludge containing chromium and aluminum according to claim 9, wherein the second solid-liquid separation apparatus comprises a washing filter press.
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| CN202021249228.1U CN212955279U (en) | 2020-06-30 | 2020-06-30 | Recovery unit who contains chromium aluminiferous mud |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477573A (en) * | 2022-03-07 | 2022-05-13 | 盛隆资源再生（无锡）有限公司 | Method for separating trivalent chromium from aluminum in aluminum sulfate solution |
| CN115927844A (en) * | 2022-11-14 | 2023-04-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Method and device for continuously leaching vanadium-containing clinker |
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2020
- 2020-06-30 CN CN202021249228.1U patent/CN212955279U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477573A (en) * | 2022-03-07 | 2022-05-13 | 盛隆资源再生（无锡）有限公司 | Method for separating trivalent chromium from aluminum in aluminum sulfate solution |
| CN115927844A (en) * | 2022-11-14 | 2023-04-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Method and device for continuously leaching vanadium-containing clinker |
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