CN100577885C - Method for reclaiming electrolyte in carbon dross of aluminium electrolysis - Google Patents
Method for reclaiming electrolyte in carbon dross of aluminium electrolysis Download PDFInfo
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- CN100577885C CN100577885C CN200710179653A CN200710179653A CN100577885C CN 100577885 C CN100577885 C CN 100577885C CN 200710179653 A CN200710179653 A CN 200710179653A CN 200710179653 A CN200710179653 A CN 200710179653A CN 100577885 C CN100577885 C CN 100577885C
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- aluminium electrolysis
- electrolyte
- recovery
- ionogen
- carbon
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 28
- 239000004411 aluminium Substances 0.000 title claims description 28
- 229910052799 carbon Inorganic materials 0.000 title claims description 26
- 239000003792 electrolyte Substances 0.000 title abstract description 6
- 239000003245 coal Substances 0.000 claims abstract description 15
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 11
- 238000011084 recovery Methods 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000003610 charcoal Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005188 flotation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 6
- 150000004673 fluoride salts Chemical class 0.000 description 5
- -1 sodium aluminum fluoride Chemical compound 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000011775 sodium fluoride Substances 0.000 description 3
- 235000013024 sodium fluoride Nutrition 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- 239000008396 flotation agent Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010009866 Cold sweat Diseases 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000015598 salt intake Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Electrolytic Production Of Metals (AREA)
Abstract
A method for retrieving electrolyte form aluminum electrolysis carbon residue, characterized in that the aluminum electrolysis carbon residue is mixed with calcium fluoride serving as disperser with a weight of 1 to 10 wt. % of the carbon residue, and coal serving as combustion catalyst with a weight of 1 to 10 wt. % of the carbon residue, and then is roasted for 1 to 3 hours under a temperature of 650 to 850 degree C.. The method has the advantages of low process cost, high retrieving rate of electrolyte, easy implementation. The retrieved electrolyte has little impurity, and can be directly and completely returned to the electrolysis cell for use without negative effect to the quality of the electrolyte and aluminum melt.
Description
Technical field
The present invention relates to electrolytical method in a kind of recovery carbon dross of aluminium electrolysis.
Background technology
At present, one ton of primary aluminum of every production effluxes 3～10 kilograms of breezes approximately owing to be subjected to electrolytical immersion and infiltration, in the breeze electrolyte content very high, account for 60%～70% of breeze weight, mainly be Sodium Fluoride, sodium aluminum fluoride, inferior sodium aluminum fluoride and small amounts aluminium.Ionogen is extremely valuable electrolysis raw material, if can efficient recovery and return electrolyzer to use reducing ton aluminium production cost and fluoride salt consumption be of great advantage, and can produce tangible economic benefit.
At present the technology of the process aluminum electrolytic breeze of report mainly is a flotation process, and technical process complexity, its flow process are divided into roughly selects for twice, triple cleaning, scans for three times and the back roasting, with water glass and AH
6Or similar substance is for adjusting agent, with kerosene and No. 2 oil or similar substance as collecting agent and pore forming material.This method rate of recovery is low, powdered carbon and other foreign matter content height in the ionogen of recovery, can not directly return electrolyzer and uses.Flotation process has the following disadvantages: it is about 9% to contain ionogen in (1) flotation powdered carbon, can not return the plain production system of charcoal; (2) contain the charcoal height in the flotation ionogen, reach more than 5%, can not return electrolyzer and use; (3) be mingled with flotation agent in the flotation ionogen, be clamminess, easily block up blanking device, can not be used for concentrated phase and carry, must carry out to use after charcoal and flotation agent are removed in roasting; (4) the about 100mg/L of content of fluoride ion in the flotation waste water is higher than and effluxes trade effluent allowable value 10mg/L, can not directly efflux, and must carry out wastewater treatment.
The report that adopts acid hydrolyzation process aluminum electrolytic breeze to reclaim fluoride salt is also arranged, and the acid hydrolyzation technical essential is: with mineral acid fluoride salt in the breeze is converted into the HF volatilization earlier, then absorbs HF with basic solution, the fluoride salt rate of recovery about 90%.
But there is the processing cost height in aforesaid method, pollutes difficult points such as big, that the ionogen rate of recovery is low, and waste liquid is difficult, industrial poor operability.The present invention is for addressing the above problem proposition, provide a kind of from carbon dross of aluminium electrolysis the efficient recovery ionogen, the rate of recovery is greater than 98%, ionogen purity is easy to the method for industrial implementation greater than 99%.The present invention is replenishing of patent of invention ZL200410069389.1 " a kind of method that reclaims fluoride salt in the aluminium electrolyzing carbon slag ".
Summary of the invention
The objective of the invention is deficiency, electrolytical method in a kind of recovery carbon dross of aluminium electrolysis that provide that a kind of processing cost is low, pollution-free, ionogen rate of recovery height, purity is high at above-mentioned existing recovery technology.
The objective of the invention is to be achieved through the following technical solutions.
Electrolytical method in a kind of recovery carbon dross of aluminium electrolysis, it is characterized in that its removal process is to allocate into to the dispersion agent Calcium Fluoride (Fluorspan) of breeze weight 1%～10% and be the combustioncatalysts coal of breeze weight 1%～10%, handles 1～3 hour at 650～850 ℃ of roasting temperatures in carbon dross of aluminium electrolysis.
Electrolytical method in a kind of recovery carbon dross of aluminium electrolysis of the present invention is characterized in that described combustioncatalysts coal is ash content＜1%, the granularity clean coal less than 3mm.
Electrolytical method in a kind of recovery carbon dross of aluminium electrolysis of the present invention, in carbon dross of aluminium electrolysis, allocate dispersion agent Calcium Fluoride (Fluorspan) and combustioncatalysts coal into, the perfect combustion that acts as a fuel of charcoal in the breeze, ionogen remains unchanged in the breeze, efficient recovery ionogen in the carbon dross of aluminium electrolysis.The effect that adds clean coal is as catching fire the agent preferential combustion, drive catching fire and burning of charcoal, quickening the oxidation rate of charcoal.Dispersion agent Calcium Fluoride (Fluorspan) adds with powder type, and its effect is to avoid the material bonding, keeps material that good flowability is arranged, and increases the contact area of charcoal and oxygen, and charcoal is fully burnt.Used Industrial Stoves can be rotary kiln, revolution bed or other similar adverse current heating installations.
Electrolytical method in a kind of recovery carbon dross of aluminium electrolysis of the present invention, maturing temperature is enough high to guarantee the charcoal perfect combustion in the breeze, guarantee that again ionogen in the breeze is non-volatile, do not melt, do not take place tangible chemical reaction, treatment temp is 650～850 ℃.
Electrolytical recovery method is pollution-free in the carbon dross of aluminium electrolysis of the present invention, and processing cost is low, and the ionogen rate of recovery is easy to industrial implementation greater than 98%.Reclaim ionogen purity greater than 99%, main component is sodium aluminum fluoride, Sodium Fluoride, small amounts aluminium and Calcium Fluoride (Fluorspan), can be used as the electrolysis raw material and directly returns the electrolyzer use.
Embodiment
Electrolytical method in a kind of recovery carbon dross of aluminium electrolysis, it is characterized in that its removal process is to allocate into to the dispersion agent Calcium Fluoride (Fluorspan) of breeze weight 1%～10% and be the combustioncatalysts coal of breeze weight 1%～10%, handles 1～3 hour at 650～850 ℃ of roasting temperatures in carbon dross of aluminium electrolysis.
Electrolytical method in a kind of recovery carbon dross of aluminium electrolysis of the present invention is characterized in that described combustioncatalysts coal is ash content＜1%, the granularity clean coal less than 3mm.
Electrolytical method in the recovery carbon dross of aluminium electrolysis of the present invention, processing cost is low, and ionogen rate of recovery height is easy to industrial implementation.Reclaiming the ionogen main component is sodium aluminum fluoride, Sodium Fluoride, small amounts aluminium and Calcium Fluoride (Fluorspan), can directly return electrolyzer and use.
Embodiment 1
Take by weighing carbon dross of aluminium electrolysis 1000 grams of granularity, allocate clean coal 10 grams of granularity into, technical pure Calcium Fluoride (Fluorspan) 100 grams less than 3mm less than 3mm, three kinds of mixing of materials are even, blended stock is carried out roasting, 850 ℃ of maturing temperatures, roasting time 1 hour obtains the ionogen of good dispersity after the roasting.Foreign matter content is 0.20% in the ionogen by analysis, mainly is the oxide compound of iron and silicon.
Embodiment 2
Take by weighing carbon dross of aluminium electrolysis 1000 grams of granularity, allocate clean coal 50 grams of granularity into, technical pure Calcium Fluoride (Fluorspan) 50 grams less than 3mm less than 3mm, three kinds of mixing of materials are even, blended stock is carried out roasting, 750 ℃ of maturing temperatures, roasting time 2 hours obtains the ionogen of good dispersity after the roasting.Foreign matter content is 0.26% in the ionogen by analysis, mainly is the oxide compound of iron and silicon.
Embodiment 3
Take by weighing carbon dross of aluminium electrolysis 1000 grams of granularity, allocate clean coal 100 grams of granularity into, technical pure Calcium Fluoride (Fluorspan) 10 grams less than 3mm less than 3mm, three kinds of mixing of materials are even, blended stock is carried out roasting, 650 ℃ of maturing temperatures, roasting time 3 hours obtains the ionogen of good dispersity after the roasting.Foreign matter content is 0.31% in the ionogen by analysis, mainly is the oxide compound of iron and silicon.
Claims (2)
1. one kind is reclaimed electrolytical method in the carbon dross of aluminium electrolysis, it is characterized in that its removal process is to allocate into to the dispersion agent Calcium Fluoride (Fluorspan) of breeze weight 1%～10% and be the combustioncatalysts coal of breeze weight 1%～10%, handles 1～3 hour at 650～850 ℃ of roasting temperatures in carbon dross of aluminium electrolysis.
2. electrolytical method in a kind of recovery carbon dross of aluminium electrolysis according to claim 1 is characterized in that described combustioncatalysts coal is ash content＜1%, the granularity clean coal less than 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710179653A CN100577885C (en) | 2007-12-17 | 2007-12-17 | Method for reclaiming electrolyte in carbon dross of aluminium electrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710179653A CN100577885C (en) | 2007-12-17 | 2007-12-17 | Method for reclaiming electrolyte in carbon dross of aluminium electrolysis |
Publications (2)
| Publication Number | Publication Date |
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| CN101255566A CN101255566A (en) | 2008-09-03 |
| CN100577885C true CN100577885C (en) | 2010-01-06 |
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| CN200710179653A Active CN100577885C (en) | 2007-12-17 | 2007-12-17 | Method for reclaiming electrolyte in carbon dross of aluminium electrolysis |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343363B (en) * | 2013-06-28 | 2016-05-11 | 湖南中大冶金设计有限公司 | The electrolytical production method of a kind of electrolgtic aluminium |
| CN104141153B (en) * | 2013-08-15 | 2016-05-04 | 郑州发祥铝业有限公司 | A kind of processing method of electrolytic cell carbon slag |
| CN104894600B (en) * | 2015-05-25 | 2017-09-19 | 东北大学 | A kind of method that charcoal and electrolyte components are separated and recovered in the solid waste containing charcoal from aluminium molten-salt electrolysis |
| CN106040438B (en) * | 2016-05-27 | 2018-07-27 | 中南大学 | The method for floating of charcoal and electrolyte is recycled in a kind of cathode carbon pieces from aluminum cell waste |
| CN107130260B (en) * | 2017-05-23 | 2019-06-11 | 中南大学 | A kind of fusion method process aluminum electrolytic breeze additive and its application method |
| CN109136564B (en) * | 2018-08-01 | 2021-02-19 | 湖南绿脉环保科技股份有限公司 | Treatment method of carbon-containing waste residues of electrolytic aluminum |
| CN109650343A (en) * | 2018-11-21 | 2019-04-19 | 国家电投集团宁夏能源铝业科技工程有限公司 | A kind of high temperature purification method of fluoride salt in anodic carbon residue |
| CN110067009A (en) * | 2019-06-12 | 2019-07-30 | 薛淼 | A kind of electrolyte block and its extraction process based on the extraction of carbon slag |
| CN112978777B (en) * | 2021-02-02 | 2022-06-03 | 中国铝业股份有限公司 | Method for treating waste material containing electrolyte |
| CN113481542B (en) * | 2021-06-28 | 2022-08-05 | 中国铝业股份有限公司 | Method and device for treating carbon slag and recycling electrolyte |
| CN113957487B (en) * | 2021-11-11 | 2022-05-06 | 河南娄科本环境科技有限公司 | Method for recovering electrolyte in carbon residue by using heat of electrolytic cell |
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| CN101255566A (en) | 2008-09-03 |
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