CN111072111A - Device and method for cooperatively treating electroplating sludge and hydrochloric acid pickling waste liquid by using electrolytic method - Google Patents
Device and method for cooperatively treating electroplating sludge and hydrochloric acid pickling waste liquid by using electrolytic method Download PDFInfo
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- CN111072111A CN111072111A CN202010038181.2A CN202010038181A CN111072111A CN 111072111 A CN111072111 A CN 111072111A CN 202010038181 A CN202010038181 A CN 202010038181A CN 111072111 A CN111072111 A CN 111072111A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/46115—Electrolytic cell with membranes or diaphragms
Abstract
The invention discloses a device and a method for coprocessing electroplating sludge and hydrochloric acid pickling waste liquid by an electrolytic method, wherein the device comprises: the direct current power supply and the electrolytic chamber are internally provided with a cation exchange membrane which separates the electrolytic chamber into an anode chamber and a cathode chamber, and the anode chamber is internally provided with an electric stirrer. The method comprises the following steps: mixing the electroplating sludge and the hydrochloric acid pickling waste liquid; the mixture was poured into the anode chamber and the cathode chamber was filled with NaHCO3An aqueous solution; starting electrolysis; and after the electrolysis is finished, filtering the solution in the cathode chamber to obtain heavy metal precipitate, and recovering the heavy metal. The invention makes full use of free hydrochloric acid in the pickling waste liquid to treat the heavy matters in the electroplating sludgeThe metal is dissolved out, and further under the action of a direct current electric field and a cation exchange membrane, heavy metal ions are promoted to migrate to the cathode and form precipitates in a cathode area, so that the dissolution, migration, removal or recovery of the heavy metal is realized, and the aim of treating waste by waste is fulfilled.
Description
Technical Field
The invention relates to the technical field of electrolytic method synergistic treatment of electroplating sludge and hydrochloric acid pickling waste liquid, in particular to a device and a method for synergistic treatment of electroplating sludge and hydrochloric acid pickling waste liquid by using an electrolytic method.
Background
The electroplating sludge as a product for treating electroplating wastewater contains various high-concentration heavy metals, and belongs to hazardous wastes of HW17 surface treatment wastes in national hazardous waste records. In recent years, the electroplating industry is rapidly developed, and according to statistics, electroplating enterprises in China produce about 1000 million of electroplating sludge every year, so that the disposal cost and the environmental pressure are huge. At present, most of electroplating sludge is subjected to harmless treatment such as heavy metal solidification by adding lime, burning and the like, the removal and resource utilization of heavy metals in the electroplating sludge are considered a little, the electroplating sludge usually contains 3% -5% of Cr, 2% -4% of Ni, 1% -2% of Cu and 1% -2% of Zn, the grade of the electroplating sludge is far higher than that of metal-rich ores, the recovery of the valuable metals is researched, the economic benefit can be brought, and the pollution of the heavy metals in the environment can be reduced.
The hydrochloric acid pickling waste liquid contains a large amount of free hydrochloric acid, iron (mostly divalent) and other trace heavy metal elements, millions of tons of hydrochloric acid pickling waste liquid are generated every year in China, and the environment is seriously damaged due to high pollution of the hydrochloric acid pickling waste liquid. The hydrochloric acid pickling waste liquid also belongs to HW34 waste acid type hazardous waste in the national hazardous waste records. At present, acid-base neutralization is mainly used in the treatment method of the hydrochloric acid pickling waste liquid, so that a large amount of alkali is consumed, a large amount of sludge is generated, and secondary pollution is easily caused. Free hydrochloric acid and iron contained in the hydrochloric acid pickling waste liquid have a high recycling value, the substances are effectively recycled, and the waste recycling treatment benefit is improved.
At present, researches on cooperative treatment of electroplating sludge and pickling waste liquid are few, and the pickling waste liquid is used as a supplementary iron source for inducing heavy metals such as Ni, Cr, Zn, Cu and the like in the electroplating sludge to be stably bound in a composite ferrite lattice so as to achieve the purpose of reducing secondary pollution. The method realizes the treatment of wastes with processes of wastes against one another to a certain extent, but has low efficiency for removing and recovering heavy metals.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a method for cooperatively treating electroplating sludge and hydrochloric acid pickling waste liquid by using an electrolytic method.
According to respective physicochemical characteristics of the electroplating sludge and the pickling waste liquid, the method adopts an electrolytic method to cooperatively treat the electroplating sludge and the pickling waste liquid containing hydrochloric acid, can fully utilize free hydrochloric acid in the pickling waste liquid to dissolve out heavy metal in the electroplating sludge, and further promotes heavy metal ions to migrate to a cathode and form precipitates in a cathode area under the action of a direct current electric field and a cation exchange membrane, so that the dissolution, migration and removal or recovery of the heavy metal are realized, and the purpose of treating waste with waste is achieved.
An apparatus for co-processing electroplating sludge and hydrochloric acid pickling waste liquid by using an electrolytic method, comprising: the electrolytic bath is characterized by comprising a direct current power supply and an electrolytic chamber, wherein a cation exchange membrane is arranged in the electrolytic chamber and separates the electrolytic chamber into an anode chamber for placing electroplating sludge and hydrochloric acid pickling waste liquid and a NaHCO chamber for placing the electroplating sludge and hydrochloric acid pickling waste liquid3The cathode chamber of solution, the anode chamber in be provided with the anode electrode, the cathode chamber in be provided with the cathode electrode, the anode electrode with DC power supply's positive pole is connected, the cathode electrode with DC power supply's negative pole is connected, the anode chamber in be provided with electric mixer.
In the device, the mixture of the pretreated electroplating sludge and the hydrochloric acid pickling waste liquid is poured into an anode chamber of an electrolysis device, the electroplating sludge and the hydrochloric acid pickling waste liquid are treated by the cooperation of an electrolysis method, free hydrochloric acid in the pickling waste liquid can be fully utilized to dissolve out heavy metal in the electroplating sludge, and further under the action of a direct current electric field and a cation exchange membrane, heavy metal ions are promoted to migrate to a cathode and form a precipitate in the cathode, so that the dissolution, migration and removal or recovery of the heavy metal are realized, and the purpose of treating waste with waste is achieved.
An anode electrode groove is arranged in the anode chamber and close to the cation exchange membrane, and the anode electrode is inserted into the anode electrode groove.
And a cathode electrode groove is arranged in the cathode chamber and close to the cation exchange membrane, and the cathode electrode is inserted into the cathode electrode groove.
The anode electrode is parallel to the cation exchange membrane, and the distance between the anode electrode and the cation exchange membrane is 0.5-2 cm, preferably 0.5-1.5 cm, and most preferably 1 cm.
The cathode electrode is parallel to the cation exchange membrane, and the distance between the cathode electrode and the cation exchange membrane is 0.5-2 cm, preferably 0.5-1.5 cm, and most preferably 1 cm.
The distance between the anode electrode and the cation exchange membrane, the distance between the cathode electrode and the cation exchange membrane and the distance between the anode electrode and the cation exchange membrane are set to be beneficial to promoting the heavy metal ions to migrate to the cathode and form a precipitate in the cathode under the action of the direct current electric field and the cation exchange membrane.
The anode electrode is a titanium ruthenium iridium anode plate, and the cathode electrode is a stainless steel mesh cathode.
The electric stirrer is arranged in the middle of the anode chamber, so that a mixture of the pretreated electroplating sludge and the hydrochloric acid pickling waste liquid has a good effect stirring effect, reaction is facilitated, and heavy metal ions are promoted to migrate to the cathode and form a precipitate in the cathode.
The anode chamber is connected with an anode feeding and discharging pipe, feeding and discharging can be carried out on the anode chamber through the anode feeding and discharging pipe, the cathode chamber is connected with a cathode feeding and discharging pipe, and feeding and discharging can be carried out on the cathode chamber through the cathode feeding and discharging pipe.
A method for cooperatively treating electroplating sludge and hydrochloric acid pickling waste liquid by utilizing an electrolytic method is realized by adopting a device for cooperatively treating the electroplating sludge and the hydrochloric acid pickling waste liquid by utilizing the electrolytic method, and comprises the following steps:
the method comprises the following steps: mixing the electroplating sludge and the hydrochloric acid pickling waste liquid, and mixing the pretreated electroplating sludge and the hydrochloric acid pickling waste liquid
Step two: pouring the mixture of the electroplating sludge pretreated in the step one and the hydrochloric acid pickling waste liquid into an anode chamber, and pouring a cathodeLoading into NaHCO3An aqueous solution;
step three: controlling different constant currents, starting the electric stirrer and starting electrolysis;
step four: and after the electrolysis is finished, filtering the solution in the cathode chamber to obtain heavy metal precipitate, and recovering the heavy metal from the heavy metal precipitate.
In the first step, the electroplating sludge and the hydrochloric acid pickling waste liquid are mixed, and the method specifically comprises the following steps:
taking the electroplating sludge, drying, grinding and sieving to obtain sieved dry sludge, adding hydrochloric acid pickling waste liquid, and stirring and mixing uniformly;
the drying temperature is 100-110 ℃, the mixture is sieved by a 90-120 mesh sieve, most preferably, the drying temperature is 105 ℃, the mixture is sieved by a 100 mesh sieve,
the mass ratio of the sieved dry sludge to the hydrochloric acid pickling waste liquid is 30-40: 70-60, most preferably, the mass ratio of the sieved dry sludge to the hydrochloric acid pickling waste liquid is 35: 65.
The conditions for stirring and mixing uniformly are as follows: stirring for 24 hours by using an electric stirrer at the rotating speed of 250r/min to uniformly mix the sludge and the acid liquor.
In the second step, NaHCO is used3The concentration of the aqueous solution is 0.05 to 0.2mol/L, and most preferably 0.1 mol/L.
NaHCO in the cathode chamber3The ratio of the volume of the aqueous solution to the volume of the mixture in the anode chamber is 1:1.3 to 2.3, most preferably 1: 1.8.
In the third step, after the electrolysis device is installed according to the second step, the anode chamber is stirred by a boosting electric stirrer at the rotating speed of 200 r/min. And turning on a power switch, controlling constant currents with different sizes, and continuously stirring and electrolyzing for 72 hours. Under the action of electrolysis, H generated by electrolysis of water in anode chamber+And H in the pickle liquor+The heavy metal in the sludge is continuously and slowly dissolved out, and Fe in the pickling waste liquid2 +、Fe3+Heavy metal ions dissolved from the electroplating sludge migrate from the anode chamber to the cathode chamber under the action of an external electric field and a cation exchange membrane and are electrolyzed with OH generated by water in the cathode chamber-And NaHCO3Produced by dissociation of solutions
And the like, and precipitates such as hydroxide, carbonate and the like are formed and deposited;
the stirring speed of the electric stirrer in the anode chamber is 150r/min to 300r/min, and more preferably, the stirring speed of the electric stirrer in the anode chamber is 200 r/min.
The constant current for electrolysis is 0.2A to 1A, and the time for electrolysis is 60h to 84h, more preferably, the constant current for electrolysis is 0.4A, and the time for electrolysis is 72 h.
In the fourth step, after the electrolysis is finished, the solution in the cathode chamber of the electrolysis device is filtered to obtain various types of precipitates such as heavy metal hydroxides, carbonates, oxides and the like. And further recovering the heavy metal by adopting different methods according to the types of the heavy metal in the precipitate.
Compared with the prior art, the invention has the following beneficial effects:
the invention mixes the electroplating sludge and the hydrochloric acid pickling waste liquid according to a certain proportion, uses the free hydrochloric acid in the pickling waste liquid to dissolve out the heavy metal in the electroplating sludge, and simultaneously, under the action of a direct current electric field and a cation exchange membrane, the H generated by the water electrolysis of an anode chamber+Further promoting the dissolution of heavy metal ions in the electroplating sludge, and the dissolved heavy metal ions and iron ions in the pickling waste liquid migrate to the cathode chamber and form precipitates with alkaline ions in the cathode chamber, thereby realizing the dissolution, migration, removal or recovery of the heavy metals in the electroplating sludge and the pickling waste liquid and achieving the purpose of treating wastes with wastes. Meanwhile, the method can adjust the mixing proportion of the electroplating sludge and the pickling waste liquid according to the actual demand, adjust the electrolysis time and meet the actual demand in the industrial production process.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for co-processing electroplating sludge and hydrochloric acid pickling waste liquid by an electrolytic method according to the present invention.
Detailed Description
The apparatus and method for co-processing electroplating sludge and waste hydrochloric acid pickling liquid according to the present invention will be further described.
As shown in fig. 1, an apparatus for co-processing electroplating sludge and hydrochloric acid pickling waste liquid by using an electrolytic method comprises: a direct current power supply 1 (namely a direct current stabilized voltage supply) and an electrolytic chamber, wherein a cation exchange membrane 10 is arranged in the electrolytic chamber, and the cation exchange membrane 10 separates the electrolytic chamber to form an anode chamber 7 for placing electroplating sludge and hydrochloric acid pickling waste liquid and a cathode chamber 7 for placing NaHCO3The cathode chamber 3 of solution, the anode chamber 7 is internally provided with an anode electrode 9, the cathode chamber 3 is internally provided with a cathode electrode 2, the anode electrode 9 is connected with the anode of a direct current power supply 1, the cathode electrode 2 is connected with the cathode of the direct current power supply 1, and the anode chamber 7 is internally provided with an electric stirrer 8.
An anode electrode groove is arranged in the anode chamber 7 and close to the cation exchange membrane 10, and an anode electrode 9 is inserted in the anode electrode groove. A cathode electrode groove is arranged in the cathode chamber 3 and close to the cation exchange membrane 10, and the cathode electrode 2 is inserted in the cathode electrode groove. Of the two electrode cells 5, the left one in the anode chamber 7 is an anode electrode cell, and the right one in the cathode chamber 3 is a cathode electrode cell.
The anode electrode 9 is parallel to the cation exchange membrane 10, and the distance between the two is 1 cm. The cathode electrode 2 is parallel to the cation exchange membrane 10, and the distance between the cathode electrode and the cation exchange membrane is 1 cm.
The anode electrode 9 is a titanium ruthenium iridium anode plate, and the cathode electrode 2 is a stainless steel mesh cathode.
The electric stirrer 8 is arranged in the middle of the anode chamber 7, so that a mixture of the pretreated electroplating sludge and the hydrochloric acid pickling waste liquid has a good effect stirring effect, reaction is facilitated, and heavy metal ions are promoted to migrate to the cathode and form a precipitate in the cathode.
The anode chamber 7 is connected with an anode feeding and discharging pipe 6, the anode chamber 7 can be fed and discharged through the anode feeding and discharging pipe 6, the cathode chamber 3 is connected with a cathode feeding and discharging pipe 4, and the cathode chamber 3 can be fed and discharged through the cathode feeding and discharging pipe 4.
Example 1
Step one, stirring and mixing electroplating sludge and hydrochloric acid pickling waste liquid;
taking a proper amount of electroplating sludge (taken from Hangzhou cloud meeting hardware electroplating Co., Ltd.), drying at 105 ℃, grinding, sieving by a 100-mesh sieve, weighing 630g of sieved dry sludge, adding hydrochloric acid pickling waste liquid according to a calculated proportion, adjusting the mass ratio to 35:65, and stirring for 24 hours at a rotating speed of 250r/min by a power-increasing electric stirrer to uniformly mix the sludge and acid liquor;
assembling an electrolysis device;
assembling the device according to the schematic diagram (figure 1), separating the cathode region from the anode region by electrodialysis cation membrane, pouring the mixture of the electroplating sludge pretreated in the step one and the hydrochloric acid pickling waste liquid into the anode chamber of the electrolysis device, and putting the cathode chamber into 0.1mol/L NaHCO solution3And (3) solution. The titanium ruthenium iridium anode plate and the stainless steel mesh cathode are aligned, the cathode and the anode are both 1cm away from the cationic membrane, the distance between the two electrodes is 2cm, the stirrer is arranged at the center of the anode area and is connected with a power supply; NaHCO 23The volume ratio of the solution to the anode mixed solution is 1: 1.8;
step three, starting a stirring device and starting electrolysis;
after the electrolysis device is installed according to the second step, the boosting electric stirrer is started in the anode chamber, and stirring is carried out at the rotating speed of 200 r/min. Turning on a power switch, controlling the current to be 0.4A, and continuously stirring and electrolyzing for 72 h. H generated by electrolysis of water in anode chamber under action of electrolysis+And H in the pickle liquor+So that heavy metal in the sludge is continuously and slowly dissolved out, and Fe in the pickling waste liquid2+、Fe3+And heavy metal ions dissolved from the electroplating sludge migrate from the anode chamber to the cathode chamber under the action of an external electric field and are electrolyzed with OH generated by the cathode chamber-And NaHCO3Produced by dissociation of solutions
And the like, and precipitates such as hydroxide, carbonate and the like are formed and deposited;
fourthly, recovering heavy metals in the sludge;
and after the electrolysis is finished, filtering the solution in the cathode area of the electrolysis device to obtain precipitates in various forms of heavy metal hydroxides, carbonates, oxides and the like, and drying and recovering the precipitates.
By the embodiment, the removal rates of zinc Zn, copper Cu, chromium Cr and nickel Ni in the anode chamber mixture after electrolysis reach 40.48%, 68.14%, 40.01% and 56.44% respectively, and the recovery rate of Fe is 51.57%.
Example 2
Step one, stirring and mixing electroplating sludge and hydrochloric acid pickling waste liquid;
taking a proper amount of electroplating sludge (taken from Hangzhou cloud meeting hardware electroplating Co., Ltd.), drying at 105 ℃, grinding, sieving by a 100-mesh sieve, weighing 630g of sieved dry sludge, adding hydrochloric acid pickling waste liquid according to a calculated proportion, adjusting the mass ratio to 35:65, and stirring for 24 hours at a rotating speed of 250r/min by a power-increasing electric stirrer to uniformly mix the sludge and acid liquor;
assembling an electrolysis device;
assembling the device according to the schematic diagram (figure 1), separating the cathode region from the anode region by electrodialysis cation membrane, pouring the mixture of the electroplating sludge pretreated in the step one and the hydrochloric acid pickling waste liquid into the anode chamber of the electrolysis device, and putting the cathode chamber into 0.1mol/L NaHCO solution3And (3) solution. The titanium ruthenium iridium anode plate and the stainless steel mesh cathode are aligned, the cathode and the anode are both 1cm away from the cationic membrane, the distance between the two electrodes is 2cm, the stirrer is arranged at the center of the anode area and is connected with a power supply; NaHCO 23The volume ratio of the solution to the anode mixed solution is 1: 1.8;
step three, starting a stirring device and starting electrolysis;
after the electrolysis device is installed according to the second step, the boosting electric stirrer is started in the anode chamber, and stirring is carried out at the rotating speed of 200 r/min. Turning on a power switch, controlling the current to be 0.4A, and continuously stirring and electrolyzing for 72 h. H generated by electrolysis of water in anode chamber under action of electrolysis+And H in the pickle liquor+So that heavy metal in the sludge is continuously and slowly dissolved out, and Fe in the pickling waste liquid2+、Fe3+And heavy metal ions dissolved from the electroplating sludge migrate from the anode chamber to the cathode chamber under the action of an external electric field and are electrolyzed with OH generated by the cathode chamber-And NaHCO3Produced by dissociation of solutions
And the like, and precipitates such as hydroxide, carbonate and the like are formed and deposited;
fourthly, recovering heavy metals in the sludge;
and after the electrolysis is finished, filtering the solution in the cathode area of the electrolysis device to obtain precipitates in various forms of heavy metal hydroxides, carbonates, oxides and the like, and drying and recovering the precipitates.
By this example, the removal rates of zinc Zn, copper Cu, chromium Cr, and nickel Ni in the anode mixture after electrolysis were 42.41%, 73.84%, 44.73%, and 69.60%, respectively, and the recovery rate of Fe was 61.37%.
Example 3
Step one, stirring and mixing electroplating sludge and hydrochloric acid pickling waste liquid;
taking a proper amount of electroplating sludge (taken from Hangzhou cloud meeting hardware electroplating Co., Ltd.), drying at 105 ℃, grinding, sieving by a 100-mesh sieve, weighing 630g of sieved dry sludge, adding hydrochloric acid pickling waste liquid according to a calculated proportion, adjusting the mass ratio to 35:65, and stirring for 24 hours at a rotating speed of 250r/min by a power-increasing electric stirrer to uniformly mix the sludge and acid liquor;
assembling an electrolysis device;
assembling the device according to the schematic diagram (figure 1), separating the cathode region from the anode region by electrodialysis cation membrane, pouring the mixture of the electroplating sludge pretreated in the step one and the hydrochloric acid pickling waste liquid into the anode chamber of the electrolysis device, and putting the cathode chamber into 0.1mol/L NaHCO solution3And (3) solution. The titanium ruthenium iridium anode plate and the stainless steel mesh cathode are aligned, the cathode and the anode are both 1cm away from the cationic membrane, the distance between the two electrodes is 2cm, the stirrer is arranged at the center of the anode area and is connected with a power supply; NaHCO 23The volume ratio of the solution to the anode mixed solution is 1: 1.8;
step three, starting a stirring device and starting electrolysis;
after the electrolysis device is installed according to the second step, the boosting electric stirrer is started in the anode chamber, and stirring is carried out at the rotating speed of 200 r/min. Turning on a power switch, controlling the current to be 0.4A, and continuously stirring and electrolyzing for 72 h. H generated by electrolysis of water in anode chamber under action of electrolysis+And in pickling waste liquorH of (A) to (B)+So that heavy metal in the sludge is continuously and slowly dissolved out, and Fe in the pickling waste liquid2+、Fe3+And heavy metal ions dissolved from the electroplating sludge migrate from the anode chamber to the cathode chamber under the action of an external electric field and are electrolyzed with OH generated by the cathode chamber-And NaHCO3Produced by dissociation of solutions
And the like, and precipitates such as hydroxide, carbonate and the like are formed and deposited;
fourthly, recovering heavy metals in the sludge;
and after the electrolysis is finished, filtering the solution in the cathode area of the electrolysis device to obtain precipitates in various forms of heavy metal hydroxides, carbonates, oxides and the like, and drying and recovering the precipitates.
By this example, the removal rates of zinc Zn, copper Cu, chromium Cr, and nickel Ni in the anode mixture after electrolysis were 44.85%, 79.20%, 50.70%, and 73.51%, respectively, and the recovery rate of Fe was 65.09%.
Claims (10)
1. An apparatus for co-processing electroplating sludge and hydrochloric acid pickling waste liquid by using an electrolytic method, comprising: the direct current power supply and the electrolytic chamber are characterized in that a cation exchange membrane is arranged in the electrolytic chamber and separates the electrolytic chamber into an anode chamber for placing electroplating sludge and hydrochloric acid pickling waste liquid and a NaHCO chamber for placing the electroplating sludge and the hydrochloric acid pickling waste liquid3The cathode chamber of solution, the anode chamber in be provided with the anode electrode, the cathode chamber in be provided with the cathode electrode, the anode electrode with DC power supply's positive pole is connected, the cathode electrode with DC power supply's negative pole is connected, the anode chamber in be provided with electric mixer.
2. The apparatus of claim 1, wherein an anode electrode tank is provided in the anode chamber adjacent to the cation exchange membrane, and the anode electrode is inserted into the anode electrode tank;
and a cathode electrode groove is arranged in the cathode chamber and close to the cation exchange membrane, and the cathode electrode is inserted into the cathode electrode groove.
3. The device of claim 1, wherein the anode electrode is parallel to the cation exchange membrane and the distance between the anode electrode and the cation exchange membrane is 0.5-2 cm;
the cathode electrode is parallel to the cation exchange membrane, and the distance between the cathode electrode and the cation exchange membrane is 0.5-2 cm.
4. The device of claim 1, wherein the anode electrode is a titanium ruthenium iridium anode plate, and the cathode electrode is a stainless steel mesh cathode.
5. The apparatus of claim 1 wherein said electric agitator is centrally disposed within said anode chamber.
6. The apparatus of claim 1 wherein the anode chamber is connected to an anode feed and discharge line and the cathode chamber is connected to a cathode feed and discharge line.
7. A method for cooperatively treating electroplating sludge and hydrochloric acid pickling waste liquid by utilizing an electrolytic method, which is realized by adopting the device for cooperatively treating the electroplating sludge and the hydrochloric acid pickling waste liquid by utilizing the electrolytic method according to any one of claims 1 to 6, and comprises the following steps:
the method comprises the following steps: mixing the electroplating sludge and the hydrochloric acid pickling waste liquid, and mixing the pretreated electroplating sludge and the hydrochloric acid pickling waste liquid
Step two: pouring the mixture of the electroplating sludge pretreated in the step one and the hydrochloric acid pickling waste liquid into an anode chamber, and filling NaHCO into a cathode chamber3An aqueous solution;
step three: controlling different constant currents, starting the electric stirrer and starting electrolysis;
step four: and after the electrolysis is finished, filtering the solution in the cathode chamber to obtain heavy metal precipitate, and recovering the heavy metal from the heavy metal precipitate.
8. The method according to claim 7, wherein the step one of mixing the electroplating sludge and the hydrochloric acid pickling waste liquid comprises:
taking the electroplating sludge, drying, grinding and sieving to obtain sieved dry sludge, adding hydrochloric acid pickling waste liquid, and stirring and mixing uniformly;
the mass ratio of the sieved dry sludge to the hydrochloric acid pickling waste liquid is 30-40: 70-60.
9. The method of claim 7, wherein in step two, said NaHCO is used3The concentration of the aqueous solution is 0.05-0.2 mol/L;
NaHCO in the cathode chamber3The ratio of the volume of the aqueous solution to the volume of the mixture in the anode chamber is 1: 1.3-2.3.
10. The method as claimed in claim 7, wherein in step three, the constant current of the electrolysis is 0.2A-1A, and the time of the electrolysis is 60 h-84 h.
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| CN112174454A (en) * | 2020-09-10 | 2021-01-05 | 同济大学 | Method for recycling sludge resources in different-quality and phase-splitting gradient manner |
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| CN105884157A (en) * | 2016-05-31 | 2016-08-24 | 浙江大学 | Method for removing and recovering heavy metal in sludge through electrolytic method |
| CN107098556A (en) * | 2017-06-23 | 2017-08-29 | 江苏荣信环保科技有限公司 | The method that recycling sludge in Wire Rope Production reclaims metal |
| CN212102127U (en) * | 2020-01-14 | 2020-12-08 | 浙江大学 | Device for coprocessing electroplating sludge and hydrochloric acid pickling waste liquid by using electrolytic method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112174454A (en) * | 2020-09-10 | 2021-01-05 | 同济大学 | Method for recycling sludge resources in different-quality and phase-splitting gradient manner |
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