CN111976061A - Method for recycling waste tires - Google Patents
Method for recycling waste tires Download PDFInfo
- Publication number
- CN111976061A CN111976061A CN201910429878.XA CN201910429878A CN111976061A CN 111976061 A CN111976061 A CN 111976061A CN 201910429878 A CN201910429878 A CN 201910429878A CN 111976061 A CN111976061 A CN 111976061A
- Authority
- CN
- China
- Prior art keywords
- acid leaching
- rubber powder
- waste tires
- recycling
- zinc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010920 waste tyre Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004064 recycling Methods 0.000 title claims abstract description 23
- 238000002386 leaching Methods 0.000 claims abstract description 66
- 239000002253 acid Substances 0.000 claims abstract description 60
- 239000000843 powder Substances 0.000 claims abstract description 48
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 36
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011701 zinc Substances 0.000 claims abstract description 20
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000007790 solid phase Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 235000021110 pickles Nutrition 0.000 claims abstract description 9
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229960001763 zinc sulfate Drugs 0.000 claims abstract description 9
- 229910000368 zinc sulfate Inorganic materials 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000001704 evaporation Methods 0.000 claims abstract description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims 1
- 238000003756 stirring Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001316 Ag alloy Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- LWUVWAREOOAHDW-UHFFFAOYSA-N lead silver Chemical compound [Ag].[Pb] LWUVWAREOOAHDW-UHFFFAOYSA-N 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0404—Disintegrating plastics, e.g. by milling to powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/16—Electrolytic production, recovery or refining of metals by electrolysis of solutions of zinc, cadmium or mercury
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for recycling waste tires, which comprises the following steps: cutting and crushing waste tires, sorting steel wires and fibers, and crushing to obtain rubber powder with the particle size of 20-200 meshes; step two, adopting a sulfuric acid solution to carry out acid leaching on the rubber powder to obtain acid leaching solution and a solid-phase substance; electrolyzing the pickle liquor to obtain metal zinc; or evaporating and crystallizing the pickle liquor to obtain zinc sulfate. The method for recycling the waste tire realizes the full utilization of valuable resources in the waste tire.
Description
Technical Field
The invention relates to the technical field of waste tire treatment, in particular to a waste tire recycling method.
Background
The rubber products are various in types and wide in application, wherein the proportion of tires exceeds 60 percent. According to statistics, the output of Chinese tires in 2017 is more than 5.8 hundred million, the output of waste tires is about 1200 ten thousand tons, the main purposes are to prepare regenerated rubber powder, fine rubber powder, tire retreading, in-situ utilization, pyrolysis oil preparation, heat energy utilization and the like, wherein about 40 percent of waste tires are scattered and stacked, and are not properly and safely treated and disposed.
The waste tires are acid and alkali resistant, strong in heat resistance and resistant to biodegradation, are difficult to degrade in a natural state, are piled in the open air for a long time, occupy the land, breed mosquitoes, propagate diseases and cause fire, so that the environment is polluted, and the waste tires are solid wastes which are difficult to recycle. Meanwhile, the waste tire has high heat value, convenient collection and stable components, can be used as clean chemical energy to be added into a metallurgical furnace kiln to replace coal and coke, reduces the production fuel cost and reduces the exhaust emission.
The prior art mainly has the following characteristics about the treatment of waste tires: (1) the waste tires are crushed into rubber powder or rubber blocks, and then directly used as combustible materials to replace coal, and the rubber powder heat value is mainly utilized; (2) various rubber powder charging devices and processes are developed, such as a blowing pipe, a spray gun, a distributing pipe, an anti-blocking pipe, blowing processes at different positions, various charging methods and the like, and the rubber powder is taken as a starting point for smoothly charging the rubber powder into the furnace; (3) passive cooperative treatment in the rubber powder furnace is more concerned about the effect of solid waste digestion treatment; (4) neglecting the influence of harmful elements in the rubber powder, such as zinc, on kiln equipment and coal gas quality after the harmful elements are combusted.
The practice of adding the zinc-containing dust into the blast furnace shows that the zinc steam enriched in the furnace can accelerate the erosion of a furnace lining, so that the serious accretion in the furnace is caused, and the smooth operation of the furnace is influenced. The tire generally contains 2% of auxiliary agent zinc oxide, and can also cause furnace circulation enrichment under the high-temperature combustion condition, thereby causing negative influence on the operation of a metallurgical furnace.
Aiming at the problems existing in the existing recycling way of the waste tire and the influence of the zinc content in the rubber powder on a high-temperature kiln, the invention aims to develop a recycling process of the waste tire, which is used for efficiently extracting iron, fiber, zinc and the like in the rubber powder, fully utilizing the heat value of the rubber powder and realizing the full utilization of the waste tire.
Disclosure of Invention
In order to solve the problems, the invention provides a method for recycling waste tires, which is used for efficiently extracting iron, fiber, zinc and the like in the waste tires and realizing the full utilization of the waste tires.
In order to achieve the above object, the method for recycling waste tires according to the present invention comprises the steps of:
cutting and crushing waste tires, sorting steel wires and fibers, and crushing to obtain rubber powder with the particle size of 20-200 meshes;
step two, adopting a sulfuric acid solution to carry out acid leaching on the rubber powder to obtain acid leaching solution and a solid-phase substance;
electrolyzing the pickle liquor to obtain metal zinc; or evaporating and crystallizing the pickle liquor to obtain zinc sulfate.
Preferably, the electrolysis waste liquid obtained by electrolysis in the third step is recycled for acid leaching in the second step.
Preferably, the diluted acid generated by the evaporative crystallization in the third step is recovered and used for the acid leaching in the second step.
Preferably, the solid phase substance in the second step is subjected to residual liquid separation, rubber powder rinsing and drying to obtain the dezincification rubber powder.
Preferably, the solid phase is used for acid leaching in the step two after waste liquid generated by residue liquid separation and rubber powder rinsing is recycled.
Preferably, the acid leaching is primary acid leaching or multi-stage acid leaching.
Preferably, the particle size of the rubber powder in the first step is 100-150 meshes.
According to the method for recycling the waste tire, secondary pollution is not generated in the processing and treating processes of the waste tire, the zinc leaching rate is high, the steel wires, the fibers, the zinc or zinc sulfate and the dezincification rubber powder recycled in the processes can be recycled in a classified manner, the additional value of resource utilization is improved, and the full utilization of valuable resources in the waste tire is realized.
Drawings
Fig. 1 is a flowchart of a method for recycling waste tires according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings.
As shown in fig. 1, the method for recycling waste tires according to the present invention includes the steps of:
cutting and crushing waste tires, sorting steel wires and fibers, and crushing to obtain rubber powder with the particle size of 20-200 meshes;
Step two, adopting a sulfuric acid solution to carry out acid leaching on the rubber powder to obtain acid leaching solution and a solid-phase substance;
electrolyzing the pickle liquor to obtain metal zinc; or evaporating and crystallizing the pickle liquor to obtain zinc sulfate.
The particle size of the rubber powder in the first step is preferably 100-150 meshes. The steel wires in the rubber powder are obtained by cutting, drawing, multi-stage crushing, magnetic separation and the like, and the fibers are obtained by a wind power separation mode; the weight percentage of steel wires and fibers in the sorted rubber powder particles is less than 1 percent.
And the acid leaching in the step two is primary acid leaching or multi-stage acid leaching. Preferably selecting secondary acid leaching, wherein the rubber powder primary acid leaching conditions are as follows: the liquid-solid ratio (weight percentage) is 3-20: 1, concentration of sulfuric acid solution: 0.25-5 mol/L, the acid leaching temperature is normal temperature, the leaching time is 20-60 min, and the stirring speed is 50-200 r/min; the secondary acid leaching conditions are as follows: 5-30 of liquid-solid ratio: 1, concentration of sulfuric acid solution: 0.05-1 mol/L, acid leaching temperature of 50-100 ℃, leaching time of 10-30 min; the stirring speed is 50-300 r/min.
The conditions for carrying out the electrolysis in the third step are as follows: adopting lead-silver alloy as an anode and an aluminum plate as a cathode for electrolysis, wherein the current density during electrolysis is 300-450A/m 2And the distance between the positive plate and the negative plate is 1-10 cm, the electrolysis temperature is 30-60 ℃, the electrolysis time is 10-60 min, and the metal zinc is obtained at the cathode. And after the zinc electrodeposition is finished, taking out the zinc powder, cleaning the deposit by using water to make the pH value of the cleaning solution neutral, and performing vacuum drying to obtain the high-purity fine-particle metal zinc powder. And recycling the electrolytic waste liquid obtained by electrolysis for acid leaching in the step two. And recovering the diluted acid generated by the evaporation and crystallization in the third step and then using the recovered diluted acid for acid leaching in the second step.
And (3) separating the solid phase obtained in the step two by using residual liquid, rinsing the rubber powder, and drying to obtain dezincification rubber powder which is used as fuel for a metallurgical furnace. The raw materials can be mixed and blown, mixed and added, agglomerated and added and the like to enter a metallurgical furnace for resource utilization of the fuel. After the rubber powder is subjected to crushing and sorting, steel wire and fiber extraction, dezincification and rinsing, the heat value is improved by 5-15% compared with that of the rubber powder which is not dezincified and unsorted. The waste tyre is rich in carbon and hydrogen, low in ash content, high in heat value and high in combustion speed, and is pretreated by the processes of sorting, dezincification, cleaning and the like, and then is sprayed/mixed into a metallurgical furnace, so that the waste treatment cost is saved, and a new way for saving energy resources of metallurgical enterprises is opened up.
And recovering waste liquid generated by residual liquid separation and rubber powder rinsing and then using the waste liquid for acid leaching in the step two.
The following are three examples of the invention:
example 1:
taking a truck heavy-duty tire, cutting, drawing, roughly breaking and crushing the waste tire, and sorting out steel wires and fibers to obtain rubber powder with the particle size of 100 meshes, wherein the weight percentages of the steel wires and the fibers in the rubber powder are less than 1%; the rubber powder is subjected to sulfuric acid solution two-stage acid leaching, and the one-stage normal-temperature acid leaching conditions are as follows: liquid-solid ratio 20: 1, concentration of sulfuric acid solution: 0.25mol/L, leaching time of 60min, and stirring speed of 200 r/min; the secondary hot acid leaching conditions are as follows: liquid-solid ratio 10: 1, concentration of sulfuric acid solution: 1mol/L, the acid leaching temperature is 90 ℃, the leaching time is 30min, and the stirring speed is 100 r/min.
After secondary acid leaching, electrolyzing the separated acid leaching solution (zinc sulfate solution), wherein the electrolysis conditions of the solution are as follows: the lead-silver alloy is used as an anode, an aluminum plate is used as a cathode, the current density during electrolysis is 500A/square meter, the distance between a positive plate and a negative plate is 10cm, the electrolysis temperature is 60 ℃, the electrolysis time is 30min, and the metal zinc is obtained by the cathode. And after the zinc electrodeposition is finished, taking out the zinc powder, cleaning the deposit by using water to make the pH value of the cleaning solution neutral, and performing vacuum drying to obtain the high-purity fine-particle metal zinc powder. The dilute sulfuric acid generated by electrolysis is returned to the acid leaching process for recycling.
And (3) the solid phase substance after the secondary acid leaching is stored after residual liquid separation, rinsing and drying and is used as fuel of a metallurgical furnace.
Example 2:
taking a car tire, cutting, drawing, roughly breaking and crushing the waste tire, and sorting out steel wires and fibers to obtain rubber powder with the particle size of 200 meshes, wherein the weight percentages of the steel wires and the fibers in the rubber powder are less than 1%; the rubber powder is subjected to sulfuric acid solution two-stage acid leaching, and the one-stage normal-temperature acid leaching conditions are as follows: liquid-solid ratio 10: 1, concentration of sulfuric acid solution: 5mol/L, leaching time of 30min, and stirring speed of 100 r/min; the secondary hot acid leaching conditions are as follows: liquid-solid ratio 30: 1, concentration of sulfuric acid solution: 1mol/L, the acid leaching temperature is 80 ℃, the leaching time is 20min, and the stirring speed is 100 r/min.
And electrolyzing the separated pickle liquor after secondary acid leaching, wherein the electrolysis conditions of the solution are as follows: the lead-silver alloy is used as an anode, an aluminum plate is used as a cathode, the current density during electrolysis is 300A/square meter, the distance between a positive plate and a negative plate is 5cm, the electrolysis temperature is 50 ℃, the electrolysis time is 60min, and the metal zinc is obtained by the cathode. And after the zinc electrodeposition is finished, taking out the zinc powder, cleaning the deposit by using water to make the pH value of the cleaning solution neutral, and performing vacuum drying to obtain the high-purity fine-particle metal zinc powder. The dilute sulfuric acid generated by electrolysis is returned to the acid leaching process for recycling.
And (3) the solid phase substance after the secondary acid leaching is stored after residual liquid separation, rinsing and drying and is used as fuel of a metallurgical furnace.
Example 3:
taking a bus tire, cutting, drawing, roughly breaking and crushing the waste tire, and sorting out steel wires and fibers to obtain rubber powder with the particle size of 150 meshes, wherein the weight percentages of the steel wires and the fibers in the rubber powder are less than 1%; carrying out tertiary acid leaching on the rubber powder by using a sulfuric acid solution, wherein the primary normal-temperature acid leaching conditions are as follows: liquid-solid ratio 5: 1, concentration of sulfuric acid solution: 0.5mol/L, leaching time of 30min, and stirring speed of 100 r/min; the secondary acid leaching conditions are as follows: liquid-solid ratio 10: 1, concentration of sulfuric acid solution: 5mol/L, the acid leaching temperature is 50 ℃, the leaching time is 20min, and the stirring speed is 200 r/min; the third-stage acid leaching conditions are as follows: liquid-solid ratio 20: 1, concentration of sulfuric acid solution: 1mol/L, the acid leaching temperature is 95 ℃, the leaching time is 30min, and the stirring speed is 100 r/min; .
And after the third-stage acid leaching, evaporating and crystallizing the separated zinc sulfate solution to obtain a zinc sulfate product, and returning the condensed and recovered liquid to the acid leaching process.
And (3) the solid phase substance after the third-stage acid leaching is subjected to residual liquid separation, rinsing and drying, and then is stored and used as fuel of a metallurgical furnace.
The following table shows the dezincification rate and the heat value improvement effect of the rubber powder of the three examples:
The method has the advantages of simple flow, mild process conditions, no secondary pollution in the processing and treating processes of the waste tires, high zinc leaching rate, recyclability of steel wires, fibers, high-purity zinc (zinc sulfate) and rubber powder after dezincification, and capability of recycling resources in a classified manner, thereby improving the additional value of resource utilization.
As described above, exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings. It should be understood that the invention is not intended to be limited to these specific details. Equivalent or similar changes in the structure and features of the exemplary embodiments may be made without departing from the spirit and scope of the invention, which shall also fall within the scope of the protection defined by the claims appended hereto.
Claims (7)
1. A method for recycling waste tires is characterized by comprising the following steps:
cutting and crushing waste tires, sorting steel wires and fibers, and crushing to obtain rubber powder with the particle size of 20-200 meshes;
step two, adopting a sulfuric acid solution to carry out acid leaching on the rubber powder to obtain acid leaching solution and a solid-phase substance;
electrolyzing the pickle liquor to obtain metal zinc; or evaporating and crystallizing the pickle liquor to obtain zinc sulfate.
2. The method for recycling waste tires according to claim 1, wherein the waste electrolyte obtained by the electrolysis in the third step is recycled and used for the acid leaching in the second step.
3. The method for recycling waste tires according to claim 1, wherein the diluted acid generated by the evaporative crystallization in the third step is recovered and used for the acid leaching in the second step.
4. The method for recycling waste tires according to claim 1, wherein the solid phase in the second step is separated from the residue, rinsed and dried to obtain dezincification rubber powder.
5. The method for recycling waste tires according to claim 4, wherein the solid substance is used for the acid leaching in the second step after the waste liquid generated by the residue separation and the rubber powder rinsing is recycled.
6. The method for recycling waste tires according to claim 1, wherein the acid leaching is primary acid leaching or multi-stage acid leaching.
7. The recycling method of waste tires according to claim 1, wherein the particle size of the rubber powder in the first step is 100 to 150 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910429878.XA CN111976061A (en) | 2019-05-22 | 2019-05-22 | Method for recycling waste tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910429878.XA CN111976061A (en) | 2019-05-22 | 2019-05-22 | Method for recycling waste tires |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111976061A true CN111976061A (en) | 2020-11-24 |
Family
ID=73437030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910429878.XA Pending CN111976061A (en) | 2019-05-22 | 2019-05-22 | Method for recycling waste tires |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111976061A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487261A (en) * | 2021-12-19 | 2022-05-13 | 盐城市恒泰橡胶有限公司 | Recovery detection process for waste tires |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5770170A (en) * | 1995-11-07 | 1998-06-23 | 698638 Alberta Ltd. | Recovery of zinc from sulphidic concentrates |
| US5889063A (en) * | 1997-04-17 | 1999-03-30 | University Of Southern Mississippi | Process for converting scrap tires to rubber particles while removing inorganic compounds from the tires |
| CN107722411A (en) * | 2017-10-19 | 2018-02-23 | 青岛华诺金属制品有限公司 | A kind of method that Waste tire regeneration utilizes |
-
2019
- 2019-05-22 CN CN201910429878.XA patent/CN111976061A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5770170A (en) * | 1995-11-07 | 1998-06-23 | 698638 Alberta Ltd. | Recovery of zinc from sulphidic concentrates |
| US5889063A (en) * | 1997-04-17 | 1999-03-30 | University Of Southern Mississippi | Process for converting scrap tires to rubber particles while removing inorganic compounds from the tires |
| CN107722411A (en) * | 2017-10-19 | 2018-02-23 | 青岛华诺金属制品有限公司 | A kind of method that Waste tire regeneration utilizes |
Non-Patent Citations (1)
| Title |
|---|
| PASADENA著: "从废弃轮胎中回收锌", 《橡胶译丛》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487261A (en) * | 2021-12-19 | 2022-05-13 | 盐城市恒泰橡胶有限公司 | Recovery detection process for waste tires |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jin et al. | A comprehensive review on the recycling of spent lithium-ion batteries: Urgent status and technology advances | |
| CN110835682B (en) | Method for cooperatively treating positive and negative active materials of waste lithium ion battery | |
| CN110828926B (en) | Method for cooperatively recovering metal and graphite from anode and cathode materials of waste lithium ion battery | |
| CN109326843B (en) | Recycling process of waste battery positive electrode material | |
| WO2018192122A1 (en) | Method for mixed acid leaching and recovery of positive electrode materials of waste lithium ion batteries | |
| CN110061320A (en) | A method of utilizing active powder material in cracking process recycling waste power lithium battery | |
| EP4207434A1 (en) | Wet separation process for waste lithium batteries and use thereof | |
| CN114606386B (en) | Process for recovering cobalt and lithium by grinding and leaching waste lithium battery | |
| CN106848472A (en) | A kind of method that lithium is reclaimed in waste lithium iron phosphate battery | |
| CN107017444A (en) | A kind of method of metal recovery in waste lithium iron phosphate battery | |
| CN110229543B (en) | Method for preparing carbon black from waste tire pyrolytic coke through molten salt heat treatment and product | |
| CN112635867B (en) | Method for recycling waste lithium battery graphite material | |
| CN107623152B (en) | Applying waste lithium ionic power battery resource recycle method | |
| CN110635191A (en) | Method for cleanly recovering all components of waste power lithium battery | |
| CN101054187A (en) | Selective volatilization recovery process and recovery system for waste zinc-manganese battery | |
| CN204529994U (en) | The treatment unit of waste cathode carbon block in electrolysis of aluminum waste tank lining | |
| CN111455183B (en) | Method for purifying and recovering lead and zinc by waste tire cracking carbon black | |
| CN109244582B (en) | Process for harmless treatment and resource utilization of waste lead storage battery | |
| CN111468285A (en) | Method for recovering nickel, cobalt and manganese from waste ternary lithium ion battery | |
| CN109097587A (en) | A kind of method of precious metal in high efficiente callback lead anode slurry | |
| CN110551899A (en) | High-efficiency energy-saving secondary lead smelting process | |
| CN107604383A (en) | A kind of method of electrolyte in smelting process extraction carbon slag | |
| CN110649344A (en) | Method for separating and recycling electrolyte in waste power lithium battery by using ultrasonic enhanced extraction method | |
| CN106498190A (en) | The method of neodymium iron boron greasy filth waste material in-situ carbon thermocatalytic chlorination recovering rare earth product | |
| CN112510280A (en) | Physical method based on hash of feature elements in foil of power battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201124 |