CN101857963A - Method for improving unit output capacity of aluminum electrolytic cell - Google Patents
Method for improving unit output capacity of aluminum electrolytic cell Download PDFInfo
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- CN101857963A CN101857963A CN 201010206995 CN201010206995A CN101857963A CN 101857963 A CN101857963 A CN 101857963A CN 201010206995 CN201010206995 CN 201010206995 CN 201010206995 A CN201010206995 A CN 201010206995A CN 101857963 A CN101857963 A CN 101857963A
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- China
- Prior art keywords
- electrolytic cell
- current
- output capacity
- unit output
- aluminum electrolytic
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 15
- 230000004907 flux Effects 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 229910016569 AlF 3 Inorganic materials 0.000 claims description 7
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 7
- 239000004615 ingredient Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 description 11
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002362 mulch Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Electrolytic Production Of Metals (AREA)
Abstract
The invention provides a method for improving the unit output capacity of an aluminum electrolytic cell, and relates to an improvement method for the manufacturing technique of the aluminum electrolytic cell. The method is characterized by comprising the following steps of: (1) adding alkaline electrolyte flux into molten salt during the electrolysis, wherein the electric conductivity of the electrolyte molten salt is 2.3 to 2.65S/cm; (2) controlling the electrolysis temperature within the range from 925 to 935 DEG C; and (3) controlling the current density within the range from 0.80 to 0.85A/cm<2>. An aluminum electrolysis flux (electrolyte) with high conductivity and high melting performance is also used in the method, so the voltage drop of the electrolyte per unit of current can be reduced, the current strength of the electrolytic cell can be improved and the purpose of improving the production of the electrolytic cell can be achieved under the condition that the current efficiency of the electrolytic cell is not influenced.
Description
Technical field
A kind of method that improves unit output capacity of aluminum electrolytic cell relates to improving one's methods of a kind of aluminium cell production technique.
Current, the not enough 0.75A/cm of domestic Electrolytic Aluminum Series average anode current density
2, real current efficient is all below 93%, and electrolysis temperature is substantially all at 940-950 ℃, and external advanced enterprise anodic current density has reached 0.9A/cm
2, potline current efficient is all between 94-96%.With comparing domestic main gap abroad is that current density and current efficiency are low, and electrolyzer unit surface output capacity is low, improves strength of current and has a high potential to improve output capacity.
The aluminium cell production requirement is steadily stable, and obtain its primary goal of better economic results is to make electrolyzer reach material balance and heat balance preferably.The method of traditional current strengthening promptly is to reduce mulch when strengthening strength of current, the methods such as heat radiating fins on sides and air blast cooling that install additional improve heat energy and distribute, though this method has reached the purpose that current strengthening is carried product, its consequence of bringing promptly is the raising of corresponding rising of bath voltage and energy consumption.Owing to departed from the energy balance of design of electrolysis cells, unavoidably having strengthened electrolyzer sidepiece heat dissipation capacity simultaneously, is that stove group forms difficulty, influences electrolytic cell currents efficient and electrolytic bath life-span, and its regulation and control variable reduces simultaneously, and the groove condition is generally relatively poor relatively.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, a kind of effective reduction bath voltage is provided, improves current efficiency, electrolyzer is moved at high current density, reach the method for carrying product and purpose of energy saving raising unit output capacity of aluminum electrolytic cell.
The objective of the invention is to be achieved through the following technical solutions.
A kind of method that improves unit output capacity of aluminum electrolytic cell is characterized in that:
(1) add alkaline electrolyte flux in the fused salt in electrolytic process, ionogen fused salt specific conductivity is 2.3-2.65S/cm;
(2) the control electrolysis temperature is 925～935 ℃;
(3) control current density is 0.80～0.85A/cm
2
A kind of method that improves unit output capacity of aluminum electrolytic cell of the present invention is characterized in that the electrolyte weight ratio consists of in the groove behind the described alkaline electrolyte flux that adds: NaF:50%～53% in the electrolyzer fused salt; KF:3%～6%; LiF:3%～6%; AlF
3: 29%～31%; CaF
2: 3%～6%; MgF
2: 1～3%.
A kind of method that improves unit output capacity of aluminum electrolytic cell of the present invention, its method that slightly reduces electrolysis temperature are to be undertaken by the mode of adjusting electrolyte ingredient.
A kind of method that improves unit output capacity of aluminum electrolytic cell of the present invention is keeping improving strength of current 5%～20% under the constant prerequisite of electrolyzer energy balance.
A kind of method that improves unit output capacity of aluminum electrolytic cell of the present invention, lead the ionogen flux of high fusion by using height, ionogen fused salt specific conductivity is improved 15-30%, promptly from about current 2.0S/cm, bring up to 2.2-2.65S/cm, the solubility property of aluminum oxide is not less than is currently using ionogen, use low narrow alumina feeding control strategy, realize 930 ℃ of left and right sides electrolysis.Current strengthening intensity 5%～20% under the situation that does not change anode aerea total, the corresponding improvement blanking amount and blanking pitch time, with current density from 0.70～0.75A/cm
2Be increased to 0.80～0.85A/cm
2Holding current efficient does not change the radiating state of electrolyzer each several part more than 94% substantially simultaneously, realizes that the energy balance of electrolyzer is stable.Help the operation of electrolyzer low-voltage high-efficiency high current density like this, can reach to carry and produce and energy-conservation dual purpose.
Embodiment
A kind of method that improves unit output capacity of aluminum electrolytic cell, (1) add high conductivity ionogen flux in the fused salt in electrolytic process, ionogen fused salt specific conductivity is 2.3-2.65S/cm, ionogen compositing range: NaF:50～53%; KF:3～6%; LiF:3～6%; AlF
3: 29～31%; CaF
2: 3～6%; MgF
2: 1～3%. (2) the control electrolysis temperature is 925 ℃～935 ℃; (3) control current density is 0.80～0.85A/cm
2
Embodiment 1
Certain aluminium cell, its Series Design strength of current 150kA, bath voltage is 4.06V, and electrolysis temperature is 944 ℃, and current density is 0.69A/cm through the scene measuring and calculating
2, pole span is about 4.6cm through field measurement.Actual current efficient is 91.8% through taking inventory analysis.Because of its current density relatively low, therefore select the higher relatively ionogen of conductivity to form, ionogen flux in the electrolyzer is led the electrolyte ingredient of high fusion by progressively being adjusted into height after filling up, and ionogen final weight ratio consists of in the groove: NaF:52%～53%; KF:4%～5%; LiF:5%～6%; AlF
3: 30%～31%; CaF
2: 3%～4%; MgF
2: 1%～2%.Specific conductivity gradually becomes 2.23S/cm by 2.02S/cm, arrives 2.46S/cm again, finally adjusts to 2.65S/cm, and conductivity lifting amplitude is 30%, the at interval reinforced and feeding quantity in simultaneously corresponding adjustment back.Strength of current is promoted to 178KA by 152KA, and the reinforcement ratio is 17%, the corresponding 0.80A/cm that brings up to of current density
2Electrolysis temperature progressively is reduced to 935 ℃ by 944 ℃, current efficiency remains on about 92.5%, bath voltage is reduced to 3.99V, ton aluminium direct current consumption is reduced to 12850kWh by 13180kWh, because sharing power consumption decreases, the Integrated Exchange power consumption is reduced to 13750kWh by 14390kWh, and single groove production capacity is increased to 500 tons/year by 423 tons/year, single groove reduces cost about 14.5 ten thousand yuan because of reducing unit power consumption every year, because of volume increase increases about 410,000 yuan of economic benefit.
Embodiment 2
Certain aluminium cell, its Series Design strength of current 200kA, bath voltage is 4.02V, and electrolysis temperature is 940 ℃, and current density is 0.73A/cm through the scene measuring and calculating
2, pole span is about 4.3cm through field measurement.Actual current efficient is 91.92% through taking inventory analysis.Because of its current density is in domestic medium level, therefore the supporting height of corresponding selection is led the ionogen composition, and ionogen final weight ratio consists of in the groove: NaF:50%～51%; KF:4%～5%; LiF:5%～6%; AlF
3: 30%～31%; CaF
2: 5%～6%; MgF
2: 1%～2%.Specific conductivity gradually becomes 2.17S/cm by 2.04S/cm, arrives 2.40S/cm again, finally adjusts to 2.52S/cm, and conductivity lifting amplitude is 23%, the at interval reinforced and feeding quantity in simultaneously corresponding adjustment back.Strength of current is promoted to 233KA by 205KA, and the reinforcement ratio is 14%, the corresponding 0.83A/cm that brings up to of current density
2Electrolysis temperature progressively is reduced to 933 ℃ by 944 ℃, current efficiency remains on about 92%, bath voltage is reduced to 3.98V, ton aluminium direct current consumption is reduced to 12900kWh by 13020kWh, because sharing power consumption decreases, ton aluminium Integrated Exchange power consumption is reduced to 13800kWh by 14470kWh, and single groove production capacity is increased to 653 tons/year by 578 tons/year, single groove reduces cost about 18.1 ten thousand yuan because of reducing unit power consumption every year, because of volume increase increases about 520,000 yuan of economic benefit.
Embodiment 3
Certain aluminium cell, its Series Design strength of current 300kA, bath voltage is 4.16V, and electrolysis temperature is 941 ℃, and current density is 0.76A/cm through the scene measuring and calculating
2, pole span is about 4.3cm through field measurement.Actual current efficient is 90.8% through taking inventory analysis.Because of its current density is in domestic higher level, therefore the supporting height of corresponding selection is led the ionogen composition, ionogen flux in the electrolyzer is led the electrolyte ingredient of high fusion by progressively being adjusted into height after filling up, and ionogen final weight ratio consists of in the groove: NaF:50%～51%; KF:5%～6%; LiF:4%～5%; AlF
3: 29%～30%; CaF
2: 5%～6%; MgF
2: 2%～3%.Specific conductivity gradually becomes 2.23S/cm by 1.98S/cm, finally adjusts to 2.35S/cm, and conductivity lifting amplitude is 19%, the at interval reinforced and feeding quantity in simultaneously corresponding adjustment back.Strength of current is promoted to 336KA by 300KA, and the reinforcement ratio is 12%, the corresponding 0.85A/cm that brings up to of current density
2Electrolysis temperature progressively is reduced to 930 ℃ by 941 ℃, current efficiency remains on about 91%, bath voltage is reduced to 4.10V, ton aluminium direct current consumption is reduced to 13426kWh by 13652kWh, because sharing power consumption decreases, the Integrated Exchange power consumption is reduced to 14100kWh by 14450kWh, and single groove production capacity is increased to 947 tons/year by 845 tons/year, single groove reduces cost about 13.2 ten thousand yuan because of reducing unit power consumption every year, because of volume increase increases about 710,000 yuan of economic benefit.
Embodiment 4
Certain aluminium cell, its Series Design strength of current 350kA, bath voltage is 4.10V, and electrolysis temperature is 937 ℃, and current density is 0.76A/cm through the scene measuring and calculating
2, pole span is about 4.4cm through field measurement.Actual current efficient is 92.7% through taking inventory analysis.Because of its current density higher relatively, therefore select the higher relatively ionogen of conductivity to form, ionogen flux in the electrolyzer is led the electrolyte ingredient of high fusion by progressively being adjusted into height after filling up, and ionogen final weight ratio consists of in the groove: NaF:50～51%; KF:3～4%; LiF:3～4%; AlF
3: 30～31%; CaF
2: 5～6%; MgF
2: 2～3%.Specific conductivity gradually becomes 2.30S/cm by 2.01S/cm, and conductivity lifting amplitude is 15%, the at interval reinforced and feeding quantity in simultaneously corresponding adjustment back.Strength of current is promoted to 368KA by 350KA, and the reinforcement ratio is 5%, the corresponding 0.80A/cm that brings up to of current density
2Electrolysis temperature progressively is reduced to 925 ℃ by 937 ℃, current efficiency slightly is increased to about 93.5%, bath voltage is reduced to 4.05V, ton aluminium direct current consumption is reduced to 12900kWh by 13180kWh, because sharing power consumption decreases, the Integrated Exchange power consumption is reduced to 13750kWh by 14090kWh, and single groove production capacity is increased to 1037 tons/year by 987 tons/year, single groove reduces cost about 16.6 ten thousand yuan because of reducing unit power consumption every year, because of volume increase increases about 350,000 yuan of economic benefit.
Above-mentioned embodiment only is that exemplary embodiment of the present invention is described; do not breaking away under the design concept prerequisite of the present invention; common engineering technical personnel make technical scheme of the present invention in this area various modification and improvement; all should be in protection scope of the present invention; the technology contents that the present invention asks for protection all is documented in claims.
Claims (4)
1. method that improves unit output capacity of aluminum electrolytic cell is characterized in that:
(1) add alkaline electrolyte flux in the fused salt in electrolytic process, ionogen fused salt specific conductivity is 2.3-2.65S/cm;
(2) the control electrolysis temperature is 925～935 ℃;
(3) control current density is 0.80～0.85A/cm
2
2. a kind of method that improves unit output capacity of aluminum electrolytic cell according to claim 1, it is characterized in that the described alkaline electrolyte flux that in the electrolyzer fused salt, adds, add-on is decided on electrolyzer amount of ram ionogen characteristic, generally be no more than 10% of the interior melt ionogen quality of groove, the electrolyte weight ratio consists of in the groove: NaF:50%～53%; KF:4%～6%; LiF:4%～6%; AlF
3: 29%～31%; CaF
2: 3%～6%; MgF
2: 1%～3%.
3. a kind of method that improves unit output capacity of aluminum electrolytic cell according to claim 1, the method that it is characterized in that slightly reducing electrolysis temperature are to be undertaken by the mode of adjusting electrolyte ingredient.
4. a kind of method that improves unit output capacity of aluminum electrolytic cell according to claim 1 is characterized in that keeping improving under the constant prerequisite of electrolyzer energy balance strength of current 5%～20%.
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|---|---|---|---|
| CN 201010206995 CN101857963A (en) | 2010-06-13 | 2010-06-13 | Method for improving unit output capacity of aluminum electrolytic cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010206995 CN101857963A (en) | 2010-06-13 | 2010-06-13 | Method for improving unit output capacity of aluminum electrolytic cell |
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| Publication Number | Publication Date |
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| CN101857963A true CN101857963A (en) | 2010-10-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1873057A (en) * | 2006-04-28 | 2006-12-06 | 中国铝业股份有限公司 | Preparation method of lead electrobath for transitting to electrolysis in low termperature |
| CN101063214A (en) * | 2007-05-31 | 2007-10-31 | 中国铝业股份有限公司 | Electrolytes for large-sized prebaked cell for aluminum-reduction |
| CN101386996A (en) * | 2008-10-17 | 2009-03-18 | 东北大学 | High conductivity low-temperature electrolytes for aluminum electrolysis and use method thereof |
-
2010
- 2010-06-13 CN CN 201010206995 patent/CN101857963A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1873057A (en) * | 2006-04-28 | 2006-12-06 | 中国铝业股份有限公司 | Preparation method of lead electrobath for transitting to electrolysis in low termperature |
| CN101063214A (en) * | 2007-05-31 | 2007-10-31 | 中国铝业股份有限公司 | Electrolytes for large-sized prebaked cell for aluminum-reduction |
| CN101386996A (en) * | 2008-10-17 | 2009-03-18 | 东北大学 | High conductivity low-temperature electrolytes for aluminum electrolysis and use method thereof |
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Open date: 20101013 |