CN101649469A - Double-layer scorched particle energy-saving roasting start method of aluminum electrolysis bath - Google Patents
Double-layer scorched particle energy-saving roasting start method of aluminum electrolysis bath Download PDFInfo
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Abstract
The invention discloses a double-layer scorched particle energy-saving roasting start method of an aluminum electrolysis bath. on the base of the prior scorched particle roasting technique, the methodpaves two layers of the scorched particles and makes up the unevenness of the cathode of the electrolysis bath by regulating the layer number and the thickness of the scorched particles to ensure theclose contact between the anode and the cathode of the electrolysis bath, smooth passing of current after the electrolysis bath is electrified and the current distribution uniformization among anodesso as to guarantee the safe and stable transition of the roasting process. The energy-saving roasting start method of the double-layer scorched particles effectively solves the problem of the unevenness of the cathode of a twice-starting electrolysis bath, also effectively solves the problem of the unevenness of a novel abnormal-shaped cathode, thoroughly solves the problem of nonuniform currentdistribution during the roasting of the twice-starting electrolysis bath and the novel abnormal-shaped cathode, ensures that the temperature of an integral furnace cavity is uniformly increased duringthe roasting and prolongs the service life of the electrolysis bath; in addition, a single electrolysis bath can save the electric energy by about more than 1.12 ten thousand degrees, thereby reducing the production operation cost.
Description
Technical field:
The present invention relates to a kind of power-economizing method, particularly relate to the method for the double-deck burnt grain energy-saving roasting start of a kind of aluminium cell.
Background technology:
Energy-saving and cost-reducing is the theme that China advocates, and the electrolysis of aluminum industry itself is exactly a highly energy-consuming manufacturing enterprise, and how to cut down the consumption of energy also is the research object of each aluminum electrolysis industry.The double-deck burnt grain energy-saving roasting start technology of aluminium cell is a kind of new roasting and starting technology of electrolyzer, it also is a necessary process before electrolyzer puts into production, coke grain calcination startup process time traditional in this process is long, energy consumption is big, moreover traditional baking coke particles technology can not solve the negative electrode problem of specially-shaped cathode and restarting, because specially-shaped cathode is irregular with needing the cathode surface of restarting, cathode surface is not on same horizontal plane, rough and uneven in surface, make troubles not only for the laying of burnt grain, it is even to guarantee that anodic current distributes, and finally causes the breakage of cathode inner lining, reduces bath life.
Because each electrolytic aluminium factory all suffered the influence of rationing the power supply, the continuation restarting all lived through after electrolyzer stopped groove, but all can not solve behind the restarting prolongation well to bath life, key is exactly the problem that the burnt grain in can not fine solution re-baking is laid, the design of modern advanced negative electrode in addition, the application of specially-shaped cathode, there is the irregular problem of cathode surface too, how to solve and in roasting and starting, keep evenly roasting of negative electrode, make it sinter a complete burner hearth into, can reach saves energy and the method that prolongs bath life again, become a main body of current research, double-deck burnt energy-saving roasting start technology of applicant's invention solved the problem of above existence, solved the irregular problem of cathode surface, solve burnt grain and laid difficulty, simplified working method, reduced roasting time simultaneously, reduced electric quantity consumption, reduced production cost, effectively improved happy bath life simultaneously, to the very significant meaning of having increased economic efficiency.
Summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, the method of the double-deck burnt grain energy-saving roasting start technology of a kind of aluminium cell is provided, it can reduce production energy consumption than traditional technology in calcination starts, effectively prolong bath life.
The technical scheme that the present invention is taked for the technical solution problem is:
The method of the double-deck burnt grain energy-saving roasting start of a kind of aluminium cell comprises conventional production method, and its technical parameter and technical characterictic are as follows:
The laying of A, the first coke charge grain: before the electrolyzer restarting, cell lining is thoroughly cleared up, exposed the negative electrode true qualities, local carry out compacting and pave, exceed 0.5mm than conventional cathode surface with graphite is broken to scraggly;
B, to the broken specification of quality of graphite: the back refinery coke is forged in the broken whole uses of employed graphite, granularity is controlled at below the 1mm, must pave the whole compactings of all recesses, guarantee density, simultaneously employed graphite is broken must be through the baking of temperature more than 120 ℃ more than 12 hours;
The specification of quality of C, the second coke charge grain: the employed burnt grain of the second layer all uses forges the back refinery cokes, granularity about 0.5～3mm, after stirring through being not less than the baking of temperature more than 120 ℃ more than 12 hours;
The laying of D, the second coke charge grain requires: require anode and cathode to contact closely when the second layer is laid, burnt grain thickness is even, and compactness is even, and anode must not be lower than 90% with burnt grain contact area; Burnt grain thickness after the compacting is determined according to the requirement of electrolyzer self, promptly the thickness of Pu Sheing is relevant with the capacity (strength of current) of electrolyzer, need lay 18mm as the 320kA electrolyzer, the 400kA electrolyzer need be laid 15mm, its objective is guarantee electrolyzer energising after-current smoothly by and the homogeneity of distribution of current;
E, electrical roasting method: adopt traditional electrical roasting method, it is traditional splitter energising technology that is flexible coupling, effectively solve the impact of total current, guarantee that cell lining slowly heats up from normal temperature, make the burner hearth integral roasting sinter a complete integral body into electrolyzer normal temperature state;
F, anodic current distribute and control: the anodic current distribution control after the energising is the main points of a double-deck burnt energy-saving roasting start, often test current distribution after the energising, in time adjusting anodic current distributes, guarantee that each group anodic distribution of current is even, guarantee the even intensification sintering of the whole fire box temperature of electrolyzer;
Temperature controlling before G, the startup: traditional electrolyzer baking coke particles technology, its roasting time was controlled at 96 hours, novel double-deck burnt grain energy-saving roasting start technology adopts 80～86 hours roasting system, 10～16 hours have been shortened than traditional baking coke particles time, separate unit electrolyzer direct saving electric weight 1.12 ten thousand degree; The while maturing temperature is controlled at whole fire box temperature and reaches 620～700 ℃, reduce below 200 ℃ for 900 ℃ than traditional baking coke particles temperature, reduced the generation of cathode inner lining crackle, reduced damaged degree, prolong the life-span of electrolyzer, obtained energy-saving effect preferably.
Positive beneficial effect of the present invention is:
1. the method for the double-deck burnt grain energy-saving roasting start of aluminium cell of the present invention, it is transformed on the basis of traditional electrolyzer coke grain calcination startup technology, keep scheme by the adjustment that changes burnt granulosa number and granularity, cooperate conventional installation and burnt particle laying method, solve the bigger requirement of cathode surface roughness, thereby guarantee that the anode and cathode distribution of current is even after the electrolyzer energising, guarantee carrying out smoothly of calcination startup.The change of burnt grain granularity, effectively control the uniformity coefficient that electrolytic cell currents distributes, the change of the number of plies effectively solves the irregular requirement of the cathode surface degree of depth, adopt the burnt grain of compound effectively to improve even that fire box temperature distributes simultaneously, for evenly heating up, whole burner hearth lays the first stone, reduce by 16 hours roasting time than traditional method for baking coke particles, effectively saved electric energy, reached the innovation of technology and the purpose that cuts down the consumption of energy.
2. because the present invention starts in the technology at the inheriting tradition baking scorched particles in aluminum electrolytic cell to have kept on the basis of original individual layer coke grain calcination startup, adjustment by focusing grain granularity, adjustment by focusing grain thickness, requirement by focusing grain drying regime, reach that to fill and lead up cathode surface rough and uneven in surface, make cathode surface be in a horizontal plane, reach contact fully for making anode and cathode, the back anode and cathode current path of guaranteeing to switch on is smooth and easy, and distribution of current evenly lays the first stone.
3. traditional electrolyzer individual layer coke grain calcination startup technology adopts 96 hours roasting systems, temperature is controlled at more than 900 ℃ and begins to start, can not fine solution fire box temperature and the difference of peripheral temperature, double-deck coke grain calcination startup technology has adopted 80～86 hours roasting systems, temperature is controlled at below 700 ℃ and begins to start, whole fire box temperature and peripheral temperature are more or less the same, help starting the rising of back integral channel temperature, reduce 10～16 hours roasting system, make more than the about 1.12 ten thousand degree electricity of separate unit electrolyzer direct saving electric energy, the separate unit electrolyzer has energy-saving effect like this, be applied to 282 electrolyzers of series and electrolyzer behind the electrolytic cell overhaul in the future, its energy-saving effect is inestimable; In energy-conservation, its double-deck burnt grain energy-saving roasting start technology has guaranteed that whole fire box temperature evenly raises during roasting, and the life-span of having improved electrolyzer has indirectly been reduced the purpose of production run cost and energy efficient.
Embodiment:
Embodiment: the method for the double-deck burnt grain energy-saving roasting start of a kind of aluminium cell, comprise conventional production method, its technical parameter and technical characterictic are as follows:
The laying of A, the first coke charge grain: before the electrolyzer restarting, cell lining is thoroughly cleared up, exposed the negative electrode true qualities, local carry out compacting and pave, exceed 0.5mm than conventional cathode surface with graphite is broken to scraggly;
B, to the broken specification of quality of graphite: the back refinery coke is forged in the broken whole uses of employed graphite, granularity is controlled at below the 1mm, must pave the whole compactings of all recesses, guarantee density, simultaneously employed graphite is broken must be through the baking of temperature more than 120 ℃ more than 12 hours;
The specification of quality of C, the second coke charge grain: the employed burnt grain of the second layer all uses forges the back refinery cokes, granularity about 0.5～3mm, after stirring through being not less than the baking of temperature more than 120 ℃ more than 12 hours;
The laying of D, the second coke charge grain requires: require anode and cathode to contact closely when the second layer is laid, burnt grain thickness is even, and compactness is even, and anode must not be lower than 90% with burnt grain contact area; Burnt grain thickness after the compacting is determined according to the requirement of electrolyzer self, promptly the thickness of Pu Sheing is relevant with the capacity (strength of current) of electrolyzer, need lay 18mm as the 320kA electrolyzer, the 400kA electrolyzer need be laid 15mm, its objective is guarantee electrolyzer energising after-current smoothly by and the homogeneity of distribution of current;
E, electrical roasting method: adopt traditional electrical roasting method, it is traditional splitter energising technology that is flexible coupling, effectively solve the impact of total current, guarantee that cell lining slowly heats up from normal temperature, make the burner hearth integral roasting sinter a complete integral body into electrolyzer normal temperature state;
F, anodic current distribute and control: the anodic current distribution control after the energising is the main points of a double-deck burnt energy-saving roasting start, often test current distribution after the energising, in time adjusting anodic current distributes, guarantee that each group anodic distribution of current is even, guarantee the even intensification sintering of the whole fire box temperature of electrolyzer;
Temperature controlling before G, the startup: traditional electrolyzer baking coke particles technology, its roasting time was controlled at 96 hours, novel double-deck burnt grain energy-saving roasting start technology adopts 80～86 hours roasting system, 10～16 hours have been shortened than traditional baking coke particles time, separate unit electrolyzer direct saving electric weight 1.12 ten thousand degree; The while maturing temperature is controlled at whole fire box temperature and reaches 620～700 ℃, reduce below 200 ℃ for 900 ℃ than traditional baking coke particles temperature, reduced the generation of cathode inner lining crackle, reduced damaged degree, prolong the life-span of electrolyzer, obtained energy-saving effect preferably.
In the present invention, the technology of not describing in detail partly is known technology.
Claims (3)
1. the method for the double-deck burnt grain energy-saving roasting start of aluminium cell comprises conventional production method, it is characterized in that:
The laying of A, the first coke charge grain: before the electrolyzer restarting, cell lining is thoroughly cleared up, exposed the negative electrode true qualities, local carry out compacting and pave, exceed 0.5mm than conventional cathode surface with graphite is broken to scraggly;
B, to the broken specification of quality of graphite: the back refinery coke is forged in the broken whole uses of employed graphite, granularity is controlled at below the 1mm, must pave the whole compactings of all recesses, guarantee density, simultaneously employed graphite is broken must be through the baking of temperature more than 120 ℃ more than 12 hours;
The specification of quality of C, the second coke charge grain: the employed burnt grain of the second layer all uses forges the back refinery cokes, granularity about 0.5～3mm, after stirring through being not less than the baking of temperature more than 120 ℃ more than 12 hours;
The laying of D, the second coke charge grain requires: require anode and cathode to contact closely when the second layer is laid, burnt grain thickness is even, and compactness is even, and anode must not be lower than 90% with burnt grain contact area; Burnt grain thickness after the compacting determines according to the requirement of electrolyzer self, its objective is guarantee electrolyzer energising after-current smoothly by and the homogeneity of distribution of current;
E, electrical roasting method: adopt traditional electrical roasting method, effectively solve the impact of total current, guarantee that cell lining slowly heats up from normal temperature, make the burner hearth integral roasting sinter a complete integral body into to electrolyzer normal temperature state;
F, anodic current distribute and control: the anodic current distribution control after the energising is the main points of a double-deck burnt energy-saving roasting start, often test current distribution after the energising, in time adjusting anodic current distributes, guarantee that each group anodic distribution of current is even, guarantee the even intensification sintering of the whole fire box temperature of electrolyzer;
Temperature controlling before G, the startup: be controlled at below 700 ℃ through 80～86 hours roastings, temperature, begin then to start, whole fire box temperature and peripheral temperature are more or less the same, help starting the rising of back integral channel temperature.
2. the method for the double-deck burnt grain energy-saving roasting start of aluminium cell according to claim 1, it is characterized in that: in " D ", the thickness that burnt grain is laid is relevant, promptly relevant with strength of current with the capacity of electrolyzer, need lay 18mm as the 320kA electrolyzer, the 400kA electrolyzer need be laid 15mm.
3. the method for the double-deck burnt grain energy-saving roasting start of aluminium cell according to claim 1 is characterized in that: in " E ", and described traditional electrical roasting method, the splitter electrifying method promptly is flexible coupling.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101838822A (en) * | 2010-04-10 | 2010-09-22 | 甘肃华鹭铝业有限公司 | Method for baking coke particles for specially-shaped cathode aluminum electrolytic tank |
| CN101985761A (en) * | 2010-12-17 | 2011-03-16 | 河南中孚实业股份有限公司 | Roasting method for secondary startup of aluminum cell |
| CN103352236A (en) * | 2013-06-25 | 2013-10-16 | 中国铝业股份有限公司 | Method for rapidly building new-started electrolytic tank furnace |
| CN103547710A (en) * | 2011-05-25 | 2014-01-29 | 力拓艾尔坎国际有限公司 | Dry cell start-up of an electrolytic cell for aluminum production |
| CN104451774A (en) * | 2014-12-29 | 2015-03-25 | 云南铝业股份有限公司 | Zero allowance cell shutting polymorph high roasting method |
| CN104711640A (en) * | 2013-12-12 | 2015-06-17 | 湖南创元铝业有限公司 | Electrolytic tank |
| CN107955951A (en) * | 2016-10-18 | 2018-04-24 | 沈阳铝镁设计研究院有限公司 | A kind of management method of electrolytic aluminium Life cycle |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101838822A (en) * | 2010-04-10 | 2010-09-22 | 甘肃华鹭铝业有限公司 | Method for baking coke particles for specially-shaped cathode aluminum electrolytic tank |
| CN101985761A (en) * | 2010-12-17 | 2011-03-16 | 河南中孚实业股份有限公司 | Roasting method for secondary startup of aluminum cell |
| CN103547710A (en) * | 2011-05-25 | 2014-01-29 | 力拓艾尔坎国际有限公司 | Dry cell start-up of an electrolytic cell for aluminum production |
| EP2739769A4 (en) * | 2011-05-25 | 2015-07-08 | Rio Tinto Alcan Int Ltd | Dry cell start-up of an electrolytic cell for aluminum production |
| US9631289B2 (en) | 2011-05-25 | 2017-04-25 | Rio Tinto International Limited | Dry cell start-up of an electrolytic cell for aluminum production |
| CN103352236A (en) * | 2013-06-25 | 2013-10-16 | 中国铝业股份有限公司 | Method for rapidly building new-started electrolytic tank furnace |
| CN104711640A (en) * | 2013-12-12 | 2015-06-17 | 湖南创元铝业有限公司 | Electrolytic tank |
| CN104711640B (en) * | 2013-12-12 | 2017-06-13 | 湖南创元铝业有限公司 | Electrolytic cell |
| CN104451774A (en) * | 2014-12-29 | 2015-03-25 | 云南铝业股份有限公司 | Zero allowance cell shutting polymorph high roasting method |
| CN107955951A (en) * | 2016-10-18 | 2018-04-24 | 沈阳铝镁设计研究院有限公司 | A kind of management method of electrolytic aluminium Life cycle |
| CN107955951B (en) * | 2016-10-18 | 2020-01-21 | 沈阳铝镁设计研究院有限公司 | Method for managing full life cycle of electrolytic aluminum |
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Application publication date: 20100217 |