CN115491501A - Method for breaking cyanide from alkaline leaching solution of aluminum electrolysis waste tank lining - Google Patents
Method for breaking cyanide from alkaline leaching solution of aluminum electrolysis waste tank lining Download PDFInfo
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- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000002699 waste material Substances 0.000 title claims abstract description 64
- 238000002386 leaching Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 39
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 30
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 68
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 32
- 230000003647 oxidation Effects 0.000 claims abstract description 31
- 230000001590 oxidative effect Effects 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 57
- 239000011734 sodium Substances 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 230000002195 synergetic effect Effects 0.000 abstract description 21
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000002572 peristaltic effect Effects 0.000 abstract description 7
- 239000007800 oxidant agent Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 235000013024 sodium fluoride Nutrition 0.000 description 2
- 239000011775 sodium fluoride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910017090 AlO 2 Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- -1 comprise Na + Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/02—Apparatus therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
- C22B3/14—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions containing ammonia or ammonium salts
-
- 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
Abstract
The invention discloses a method for breaking cyanide from an alkaline leaching solution of an aluminum electrolysis waste cell lining, which comprises two steps of ultrasonic synergistic strengthening and hydrogen peroxide oxidation, and specifically comprises the following steps: firstly, placing a certain amount of alkaline leaching solution of a waste tank liner in a container, and arranging an ultrasonic transmitter in the container; secondly, a peristaltic pump is adopted, and a certain amount of oxidant hydrogen peroxide is uniformly added into the waste tank liner alkaline leaching solution a according to a certain flow rate; then, starting an ultrasonic transmitter to operate a switch, and carrying out synergistic enhanced oxidation on the alkaline leaching solution of the aluminum electrolysis waste cell lining to remove cyanide; and (5) after cyanogen breaking is finished, obtaining a cyanogen-removed solution. The method reduces the consumption of hydrogen peroxide, improves the reaction efficiency and realizes the efficient removal of cyanide in the alkaline leaching solution of the aluminum electrolysis waste tank liner by the ultrasonic synergistic enhanced oxidation, and has the advantages of low cost, high hydrogen peroxide utilization rate, simple process, less equipment investment and environmental protection.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for removing cyanide from an alkaline leaching solution of an aluminum electrolysis waste tank liner.
Background
Aluminum is an important metal in national economic construction, is the second largest metal with the yield and consumption second to steel, and is the first metal in the nonferrous metals. Because of the advantages of light weight, strong corrosion resistance and the like of aluminum, various alloy materials taking aluminum as a basic material are widely applied in the fields of aerospace, automobiles, building materials, electronics and the like.
At present, the production of metallic aluminum by molten salt electrolysis of aluminum oxide is the mainstream process for refining metallic aluminum. The electrolytic cell is an important device for aluminum electrolysis, after the electrolytic cell is used for a certain period, the electrolytic cell is overhauled to produce a waste cell lining, wherein the main component of the waste cell lining is carbon, and the waste cell lining also contains harmful components such as fluoride, cyanide and the like, so that the waste cell lining has recycling value, but is also a dangerous waste. The treatment process of the waste slot lining comprises a pyrogenic process and a wet process. The pyrogenic process is to treat the waste tank lining at high temperature, and although dangerous components such as cyanide and the like can be broken by the high temperature, valuable components such as carbon are wasted and cannot be recycled. Therefore, the wet process is the mainstream process for treating the waste slot liner at present. The wet process for treating the waste tank lining generally adopts water immersion or alkaline immersion to leach soluble substances such as sodium fluoride, sodium cyanide and the like into a solution, carbon is recovered from slag, the solution is subjected to harmless treatment and recycling of valuable components, and the value maximization of the waste tank lining is realized.
The alkaline leachate of the waste tank liner contains components such as sodium fluoride, sodium aluminate, sodium silicate, sodium cyanide and the like, wherein the sodium cyanide is a harmful component and extremely harmful to production operation and occupational health, so that the alkaline leachate needs to be disposed. The existing disposal techniques of sodium cyanide in solution include hypochlorite oxidation technique, ozone oxidation technique and SO 2 Air oxidation technologyThe cyanide can be harmlessly treated by the technologies, such as a high-temperature high-pressure oxidation technology, an electrochemical treatment technology, a metal salt complexing treatment technology and the like, but the technologies have defects in the aspects of production cost, energy consumption, removal efficiency, process equipment configuration, environmental protection and the like. CN202111612394 patent ultrasonic wave cooperating with SO 2 The method for degrading gold cyanidation tailings is provided, and the SO can be reduced by adopting ultrasonic wave to treat gold cyanidation tailings pulp 2 Consumption and cyanide reduction efficiency of gold cyanidation tailings are improved, but SO is caused by gas-liquid phase reaction 2 Low overall utilization of unreacted SO 2 The large amount of gas and the air escape are unfavorable for production operation and occupational health, which limits the industrial application of the technology.
Therefore, a technology which is economical in cost, high in efficiency, simple in process, low in equipment investment and environment-friendly is needed to be found, and the cyanide in the alkaline leaching solution of the aluminum electrolysis waste cell lining is efficiently broken.
Disclosure of Invention
The invention aims to provide a method for breaking cyanide from an alkaline leaching solution of an aluminum electrolysis waste tank liner.
The invention aims to realize the method for breaking cyanide by using the alkaline leaching solution of the aluminum electrolysis waste cell liner, which comprises the steps of leaching and breaking cyanide, and specifically comprises the following steps:
A. leaching: adding an alkaline solution into the aluminum electrolysis waste cell lining to be treated for leaching to obtain an alkaline leaching solution a and leaching residues b;
B. cyanide removal: adding hydrogen peroxide into the alkaline leaching solution a at a flow rate of 0.1-3.0 ml/min under the condition of power of 100-500W for synergistically enhancing oxidation to remove cyanide, thus obtaining a cyanide-removed solution with the cyanide content of less than 0.10mg/L.
The principle of the ultrasonic wave synergistic enhanced oxidation process is as follows:
in the alkaline leaching solution of the waste cathode, the existing ions mainly comprise Na + 、AlO 2 - 、SiO 3 2- 、F - 、Cl - 、OH - 、CN - . Adding hydrogen peroxide and CN as oxidant in the process of eliminating cyanide - And H 2 O 2 Active oxygen [ O ]]An oxidation reaction occurs. Meanwhile, hydrogen peroxide is decomposed to generate oxygen and water. The chemical reactions that take place in this process are as follows:
2NaCN+5H 2 O 2 →2NaHCO 3 +N 2 ↑+4H 2 O（1-1）
CN - +[O]→HCO 3 - +N 2 ↑（1-2）
2H 2 O 2 →2H 2 O+O 2 ↑（1-3）
ultrasonic waves are introduced in the cyanogen breaking process, and under the action of ultrasonic cavitation, the cyanogen breaking agent has the following promotion effects:
(1) Accelerating CN - 、H 2 O 2 Active oxygen [ O ]]The diffusion and migration of plasma improve the reactivity of cyanide ions and hydrogen peroxide;
(2) Accelerated generation of N 2 And HCO 3 - The migration of (3) reduces the concentration of local products, promotes the forward progress of the cyanogen-breaking chemical reaction, and improves the limit and the speed of the cyanogen-breaking reaction;
(3) Cavitation bubbles are generated by the cavitation effect, the cavitation bubbles collapse to generate high negative pressure, and oxygen in the air is pressed into the solution by the negative pressure, so that the concentration of dissolved oxygen in the solution is improved, and the oxidation capacity of the solution is enhanced;
(4) Cavitation effect generates cavitation bubbles, the cavitation bubbles collapse to generate instantaneous high temperature and high pressure, and the instantaneous high temperature and high pressure provides energy to strengthen the fracture of C-N chemical bonds to generate C 4+ And N 5- ，C 4+ And O 2 2- Active oxygen [ O ]]、H + Binding to HCO 3 - ，N 5- Quilt O 2 2- Active oxygen [ O ]]By oxidation to N 2 And escape the solution as a gas.
The invention aims to solve the key technical problems of large oxidant consumption, high production cost and the like caused by low removal efficiency of the conventional cyanogen breaking process of the alkaline leachate of the aluminum electrolysis waste cell lining, develop a cyanogen breaking technology of the alkaline leachate of the aluminum electrolysis waste cell lining, which has the advantages of low cost, high efficiency, low equipment investment and environmental protection, and return the treated solution to a waste cell lining leaching system for recycling after valuable components such as cryolite and the like are recovered.
In order to realize the purpose, the invention is realized by the following technical scheme:
the method for breaking cyanide by using the alkaline leaching solution of the aluminum electrolysis waste tank lining comprises the following steps:
(1) A certain amount of the alkaline leaching solution a of the waste tank liner is placed in a container G, in which an ultrasonic emitter F is arranged.
(2) Adding a certain amount of hydrogen peroxide b into the alkaline leaching solution a of the waste cell lining by adopting a peristaltic pump according to a certain flow, starting an ultrasonic transmitter F to operate a switch, and carrying out synergistic enhanced oxidation on the alkaline leaching solution of the aluminum electrolysis waste cell lining to remove cyanide under a certain power condition.
(3) And after cyanogen breaking is finished, obtaining cyanogen broken liquid c.
Preferably, in the step (1), the alkaline leaching solution a for the waste aluminum cell lining mainly has the properties of pH 12-14, na 30-100g/L, al 2-10g/L, F3-10g/L and Si: 500 to 1000mg/L and 10 to 100mg/L of cyanide.
Preferably, in the step (2), the certain amount of hydrogen peroxide is 2.0 to 8.0 times of the theoretical amount of hydrogen peroxide.
Preferably, in the step (2), the certain flow rate is 0.1-3.0 mL/min.
Preferably, in the step (2), the alkaline leaching solution of the aluminum electrolysis waste cell lining is subjected to synergistic enhanced oxidation to remove cyanide, and the reaction temperature is room temperature without external heating.
Preferably, in the step (2), the alkaline leaching solution of the aluminum electrolysis waste cell lining is subjected to synergistic enhanced oxidation to remove cyanide, and the reaction time is 20 to 60min.
Preferably, in the step (2), "under a constant power condition", the power is 100 to 500w.
Preferably, in the step (3), the cyanide content of the cyanide-broken liquid c is 0.004-0.10mg/L.
The invention has the beneficial effects that:
1) Compared with the traditional method for removing cyanide by oxidizing the alkaline leaching solution of the waste tank liner with hydrogen peroxide, the method greatly improves the mass transfer efficiency and the utilization efficiency of active oxygen in the solution under the synergistic enhancement of ultrasonic waves, thereby reducing the consumption of the hydrogen peroxide and realizing the reduction of the production cost.
2) The ultrasonic wave synergistic enhanced oxidation technology is adopted, and the instantaneous high temperature and high pressure of a micro-area formed by the generation and collapse of micro-bubbles under the action of ultrasonic waves are utilized to enhance the damage to cyanide ions in the solution, so that the removal efficiency of cyanide is greatly improved.
The method for breaking cyanide from the alkaline leaching solution of the aluminum electrolysis waste cell lining comprises two steps of ultrasonic synergistic strengthening and hydrogen peroxide oxidation, and specifically comprises the following steps: firstly, placing a certain amount of alkaline leachate lined with a waste tank in a container, and arranging an ultrasonic transmitter in the container; secondly, a peristaltic pump is adopted, and a certain amount of oxidant hydrogen peroxide is uniformly added into the waste tank liner alkaline leaching solution a according to a certain flow rate; then, starting an ultrasonic transmitter to operate a switch, and carrying out synergistic enhanced oxidation on the alkaline leaching solution of the aluminum electrolysis waste cell lining to remove cyanide; and (5) after cyanogen breaking is finished, obtaining a cyanogen-removed solution. The method reduces the consumption of hydrogen peroxide, improves the reaction efficiency and realizes the efficient removal of cyanide in the alkaline leaching solution of the aluminum electrolysis waste cell lining through the ultrasonic synergistic enhanced oxidation, and has the advantages of low cost, high hydrogen peroxide utilization rate, simple process, less equipment investment and environmental protection.
Drawings
FIG. 1 is a schematic view of the process of the present invention;
FIG. 2 is a schematic diagram of the principle of the ultrasonic wave in cooperation with the oxidation for cyanogen breaking.
Detailed Description
The invention is further illustrated by the following examples, but is not intended to be limited in any way, and any modifications or alterations based on the teachings of the invention are intended to fall within the scope of the invention.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The method for removing cyanide from the alkaline leaching solution of the aluminum electrolysis waste cell lining comprises the steps of leaching and removing cyanide, and specifically comprises the following steps:
A. leaching: adding an alkaline solution into the aluminum electrolysis waste cell lining to be treated for leaching to obtain an alkaline leaching solution a and leaching residues b;
B. breaking cyanide: adding hydrogen peroxide into the alkaline leaching solution a at a flow rate of 0.1-3.0 ml/min under the condition of power of 100-500W for synergistically enhancing oxidation to remove cyanide, thus obtaining a cyanide-removed solution with the cyanide content of less than 0.10mg/L.
The alkaline leaching solution a has the following properties: the pH value is 12 to 14, the sodium is 30 to 100g/L, the aluminum is 2 to 10g/L, the fluorine is 3 to 10g/L, the silicon is 500 to 1000mg/L, and the cyanide is 10 to 100mg/L.
In the step B, the dosage of the hydrogen peroxide is 2.0 to 8.0 times of the theoretical dosage.
And B, the temperature for removing the cyanide through synergistic enhanced oxidation in the step B is room temperature.
And the time for removing the cyanide by the synergistic enhanced oxidation in the step B is 20 to 60min.
The invention discloses a method for breaking cyanide from an alkaline leaching solution of an aluminum electrolysis waste tank liner, which comprises two processes of ultrasonic synergistic strengthening and cyanide breaking by oxidation, wherein the two processes are synchronously carried out in the same unit process, and specifically comprises the following steps:
A. placing a certain amount of waste tank liner alkaline leaching liquid a in a container G, and arranging an ultrasonic transmitter F in the container;
B. hydrogen peroxide oxidation: uniformly adding a certain amount of oxidant hydrogen peroxide b into the waste tank liner alkaline leaching solution a according to a certain flow rate by adopting a peristaltic pump;
C. ultrasonic synergistic enhanced oxidation: starting an ultrasonic transmitter F operation switch, and carrying out synergistic enhanced oxidation on the alkaline leachate lined with the aluminum electrolysis waste tank to remove cyanide;
D. and (5) after cyanogen breaking is finished, obtaining a cyanogen-removed liquid c.
In the step A, the alkaline leaching solution a of the waste slot liner is an alkaline solution with the pH value of 12-14, and the cyanide content is 10-100mg/L.
And B, the dosage of the hydrogen peroxide is 2.0 to 8.0 times of the theoretical dosage, and the flow of the hydrogen peroxide is 0.1 to 3mL/min.
And C, carrying out synergistic enhanced oxidation on the alkaline leaching solution of the waste slot liner to remove cyanide, wherein the reaction temperature is room temperature, no external heating is needed, and the reaction time is 20-60min.
The invention is further illustrated by the following specific examples:
example 1
The alkaline leaching solution for the waste tank liner adopted in the embodiment mainly comprises the following components of pH12, sodium 40.66g/L, aluminum 2.38g/L, fluorine 6.80g/L and silicon: 711.60mg/L cyanide 22.40mg/L.
(1) Taking 4L of the waste tank liner alkaline leachate, placing the waste tank liner alkaline leachate in a 5L beaker, and installing a stirring device; (2) placing an ultrasonic wave emitting device in the leaching solution and fixing; (3) The adding amount of the hydrogen peroxide is 2.0 times of the theoretical amount, the hydrogen peroxide with the concentration of 30 percent is weighed and added into the alkaline leaching solution by a peristaltic pump, and the adding flow of the hydrogen peroxide is 0.14mL/min; (4) And (3) starting an operation switch of an ultrasonic transmitting device, controlling the power to be 200W, and starting to perform ultrasonic synergistic enhanced oxidation of the alkaline leachate of the waste tank liner to remove cyanide, wherein the reaction time is 20min. The content of cyanide after cyanide breaking is 0.095mg/L, and the removal rate of cyanide is 99.57%.
Example 2
The alkaline leaching solution for the waste tank liner adopted in the embodiment mainly comprises the following components of pH14, sodium 53.58g/L, aluminum 2.97g/L, fluorine 8.07g/L and silicon: 808.40mg/L, cyanide 62.40mg/L.
(2) Taking 4L of the waste tank liner alkaline leachate, placing the waste tank liner alkaline leachate in a 5L beaker, and installing a stirring device; (2) placing the ultrasonic transmitting device in the leaching solution and fixing; (3) The adding amount of hydrogen peroxide is 4.0 times of the theoretical amount, the hydrogen peroxide with the concentration of 30 percent is weighed and added into the alkaline leaching solution by a peristaltic pump, and the adding flow of the hydrogen peroxide is 0.18mL/min; (4) And starting an operation switch of the ultrasonic transmitting device, wherein the power is 300W, and starting to perform ultrasonic synergistic enhanced oxidation of the waste tank liner alkaline leachate to remove cyanide, wherein the reaction time is 40min. The content of cyanide after cyanide breaking is 0.032mg/L, and the removal rate of cyanide is 99.92%.
Example 3
The alkaline leaching solution for the waste tank liner adopted by the embodiment mainly comprises pH14, sodium 83.34g/L, aluminum 7.51g/L, fluorine 9.03g/L, silicon 983.40mg/L and cyanide 95.32mg/L.
(1) Taking 4L of the waste tank liner alkaline leachate, placing the waste tank liner alkaline leachate in a 5L beaker, and installing a stirring device; (2) placing the ultrasonic transmitting device in the leaching solution and fixing; (3) The adding amount of the hydrogen peroxide is 8.0 times of the theoretical amount, the hydrogen peroxide with the concentration of 30 percent is weighed and added into the alkaline leaching solution by a peristaltic pump, and the adding flow of the hydrogen peroxide is 0.20mL/min; (4) And starting an operation switch of the ultrasonic transmitting device, wherein the power is 500W, and starting to perform ultrasonic synergistic enhanced oxidation of the waste tank liner alkaline leachate to remove cyanide, wherein the reaction time is 60min. The cyanide content of the cyanide solution after cyanide breaking is 0.027mg/L, and the cyanide breaking rate is 99.97%.
Claims (5)
1. A method for breaking cyanide from an alkaline leaching solution of an aluminum electrolysis waste cell liner is characterized by comprising the steps of leaching and breaking cyanide, and specifically comprises the following steps:
A. leaching: adding an alkaline solution into the aluminum electrolysis waste cell lining to be treated for leaching to obtain an alkaline leaching solution a and leaching residues b;
B. breaking cyanide: adding hydrogen peroxide into the alkaline leaching solution a at a flow rate of 0.1-3.0 ml/min under the condition of power of 100-500W for synergistically enhancing oxidation to remove cyanide, thus obtaining a cyanide-removed solution with the cyanide content of less than 0.10mg/L.
2. The method for breaking cyanide in alkaline leachate of spent aluminium electrolysis cell lining according to claim 1, wherein the properties of the alkaline leachate a are as follows: the pH value is 12 to 14, the sodium is 30 to 100g/L, the aluminum is 2 to 10g/L, the fluorine is 3 to 10g/L, the silicon is 500 to 1000mg/L, and the cyanide is 10 to 100mg/L.
3. The method for breaking cyanide in the alkaline leaching solution for the aluminum electrolysis waste cell lining according to claim 1, wherein the dosage of hydrogen peroxide in the step B is 2.0 to 8.0 times of the theoretical dosage.
4. The method for removing cyanide from an alkaline leach solution from a lining of an aluminum reduction cell according to claim 1, wherein the temperature for synergistically enhancing the oxidative cyanide removal in the step B is room temperature.
5. The method for removing cyanide from the alkaline leachate of the aluminum electrolysis waste cell lining as claimed in claim 1, wherein the time for synergistically enhancing the oxidative cyanide removal in step B is 20 to 60min.
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