CN105088275A - Roasting medium for curved cathode aluminum electrolysis cell corner and roasting method - Google Patents
Roasting medium for curved cathode aluminum electrolysis cell corner and roasting method Download PDFInfo
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- CN105088275A CN105088275A CN201510615078.9A CN201510615078A CN105088275A CN 105088275 A CN105088275 A CN 105088275A CN 201510615078 A CN201510615078 A CN 201510615078A CN 105088275 A CN105088275 A CN 105088275A
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Abstract
The invention relates to a roasting medium for a curved cathode aluminum electrolysis cell corner and a roasting method, and belongs to the technical field of aluminum electrolysis cell roasting. The roasting medium comprises, by mass, 5-15% of graphite powder and the balance waste cathode carbon blocks, and the sum of the mass of the components is 100%. Scorched particles are replaced with the roasting medium which serves as the graphite aluminum electrolysis cell corner cathode roasting medium. According to the roasting method, the roasting temperature of a corner cathode is greatly increased, a corner lining is roasted more thoroughly, and gradient of the temperature of the curved cathode aluminum electrolysis cell corner and other parts is reduced; and after starting, a corner hearth of an electrolysis cell is formed well, and the stable running of the aluminum electrolysis cell in the production technology is guaranteed. Meanwhile, the problem of the recovery of dangerous high-fluorine-content solid waste in the aluminum electrolysis production process is effectively solved, the villiaumite and an electrolyte in the aluminum electrolysis dangerous solid waste are sufficiently and circularly utilized, and the roasting starting cost of the aluminum electrolysis cell is reduced.
Description
Technical field
The invention belongs to roasting aluminum electrolytic bath technical field, relate to a kind of roasting medium of aluminium cell, in particular to a kind of roasting medium for curved cathode aluminium cell bight, use the roasting method of this roasting medium, and the curved cathode aluminium cell that roasting goes out.
Background technology
At present, domestic and international aluminium cell presents trend that is curving and that maximize, and according to statistics, the curving of domestic aluminium cell reaches more than 80%, but the baking start-up method of most of curved cathode aluminium cell is still baking coke particles method.It is by laying one deck roasting medium between curved cathode aluminium electrolytic cell cathode and anode, then electrical roasting, and the main composition of its roasting medium is burnt grain or Graphite Powder 99 or the mixture of the two.
Baking coke particles method homogeneous current distribution during roasting, preheating temperature curve easily controls, and roasting energy consumption is low, Be very effective.But four angle roastings of the method curved cathode aluminium cell during roasting are not thorough, cause the gradient of bight and other spot temperature excessive, significantly increase liner thermal stresses.After startup, under square one, curved cathode aluminium cell easily forms bight stove side irregularity, to stretch one's legs hypertrophy, thus cause the bight anode rod bending of curved cathode aluminium cell, top disconnected, increase and change the anode frequency, increase considerably the labour intensity of worker, add power consumption, reduce electrolyzer economic and technical norms, reduce labour productivity.Therefore, be necessary to be improved prior art, study a kind of roasting medium for curved cathode aluminium cell bight newly and preparation method thereof, to improve the economic and technical norms of aluminium cell.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, a kind of roasting medium for curved cathode aluminium cell bight being provided, using the roasting method of this roasting medium, and the curved cathode aluminium cell that roasting goes out.The present invention is that the baking mixed medium of major ingredient replaces burnt grain as electrolysis of aluminum groove angle pole roasting medium with aluminum electrolysis waste cathode, significantly improve the maturing temperature of pole, angle, make bight liner roasting more thorough, reduce the gradient of curved cathode aluminium cell bight and other spot temperature, after starting, the bight stove side of electrolyzer is formed good, ensures smooth running in aluminium cell production process.
The technical solution used in the present invention is as follows:
For the roasting medium in curved cathode aluminium cell bight, comprise the following component according to mass percentage:
Graphite Powder 99 5 ~ 15%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%.
The preparation method of this roasting medium adopts conventional method, as physical agitation, mixes and get final product.
In technique scheme, described waste and old cathode carbon block is after aluminium cell overhaul, clean with the magazins' layout such as insulating brick, refractory brick, ionogen, and the waste carbon cellulosic material of moisture content (w/w) < 1 ‰, particle diameter is 4-6mm.
Further, preferably, described particle diameter is 5mm.
The present invention also provides a kind of roasting method of curved cathode aluminium cell, adopts the above-mentioned roasting medium for curved cathode aluminium cell bight, comprises the steps:
Steps A, mixes waste and old cathode carbon block and Graphite Powder 99 by following mass percent, namely forms a kind of baking mixed medium:
Graphite Powder 99 5 ~ 15%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%;
Step B, being layed in the baking mixed homogeneous media in described steps A between the anode and cathode of curved cathode aluminium cell bight, laying depth is 15-25mm;
Step C, be layed in by burnt for routine grain between the anode and cathode of curved cathode aluminium cell except other positions in bight, laying depth is 20-30mm;
Step D, after having laid through step B and step C, electrical roasting is carried out to curved cathode aluminium cell, controlled roasting voltage lower than 3.5V, curved cathode aluminium cell corner positions is 800 DEG C ~ 900 DEG C from normal temperature roasting to temperature, and other position from normal temperature roasting to temperature is 850 ~ 950 DEG C; From normal temperature roasting to 800 DEG C ~ 950 DEG C these temperature ranges, generally need roasting 72 hours-96 hours;
Step e, after roasting completes, is poured into ionogen and starts, remain baking mixed medium and eliminated by salvaging mode together with burnt grain.
Further, preferably, the laying depth described in step B is 20mm.
Further, preferably, the laying depth described in step C is 25mm.
Further, preferably, in step D, corner positions and the equal roasting in other position to temperature are 900 DEG C
In the roasting method of curved cathode aluminium cell, the laying of described step B and step C requires that medium and burnt grain surface inclusion-free are closed in mixed roasting, without macrobead, lays smooth, even, closely knit.
The present invention provides a kind of curved cathode aluminium cell adopting the roasting method roasting of above-mentioned curved cathode aluminium cell to obtain in addition.
compared with prior art, its beneficial effect is in the present invention:
(1) the present invention is that the baking mixed medium of major ingredient replaces burnt grain as electrolysis of aluminum groove angle pole roasting medium with aluminum electrolysis waste cathode, significantly improve the maturing temperature in bight, make bight liner roasting more thorough, reduce the gradient (namely reducing temperature head) of curved cathode aluminium cell bight and other spot temperature, after starting, the bight stove side of electrolyzer is formed good, ensures smooth running in aluminium cell production process.
(2) the present invention efficiently solves a difficult problem for fluorine-containing higher dangerous solid waste recycling in Aluminium Electrolysis process, and villiaumite fully in the recycle dangerous solid waste of electrolysis of aluminum and ionogen, reduce the roasting and starting cost of aluminium cell.
(3) the present invention makes full use of waste and old cathode and Graphite Powder 99 is mixed to form the baking mixed medium of different conductance by different ratios, and selectively lay, change roasting medium local electrical resistance, thus adjustment distribution of current, the parameters such as all temps during making roasting, distribution of current are more steady.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
It will be understood to those of skill in the art that the following example only for illustration of the present invention, and should not be considered as limiting scope of the present invention.Unreceipted concrete technology or condition person in embodiment, according to the technology described by the document in this area or condition or carry out according to product description.Agents useful for same or the unreceipted production firm person of instrument, being can by buying the conventional products obtained.
Embodiment 1
A roasting method for curved cathode aluminium cell, comprises the steps:
Steps A, mixes waste and old cathode carbon block and Graphite Powder 99 by following mass percent, namely forms a kind of baking mixed medium:
Graphite Powder 99 5%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%;
Described waste and old cathode carbon block is after aluminium cell overhaul, clean with magazins' layout, and the waste carbon cellulosic material of moisture content < 1 ‰, particle diameter is 5mm;
Step B, being layed in the baking mixed homogeneous media in described steps A between the anode and cathode of 300kA curved cathode aluminium cell bight, laying depth is 20mm;
Step C, be layed in by burnt for routine grain between the anode and cathode of curved cathode aluminium cell except other positions in bight, laying depth is 20mm;
Step D, after having laid through step B and step C, has carried out electrical roasting to curved cathode aluminium cell, and control roasting voltage lower than 3.5V, the roasting of curved cathode aluminium cell corner positions is 900 DEG C to temperature, and other position roasting is also 900 DEG C to temperature;
Step e, after roasting completes, is poured into ionogen and starts, remain baking mixed medium and eliminated by salvaging mode together with burnt grain.
Embodiment 2
A roasting method for curved cathode aluminium cell, comprises the steps:
Steps A, mixes waste and old cathode carbon block and Graphite Powder 99 by following mass percent, namely forms a kind of baking mixed medium:
Graphite Powder 99 10%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%;
Described waste and old cathode carbon block is after aluminium cell overhaul, clean with the magazins' layout such as insulating brick, refractory brick, ionogen, and the waste carbon cellulosic material of moisture content (w/w) < 1 ‰, particle diameter is 4mm;
Step B, being layed in the baking mixed homogeneous media in described steps A between the anode and cathode of curved cathode aluminium cell bight, laying depth is 25mm;
Step C, be layed in by burnt for routine grain between the anode and cathode of curved cathode aluminium cell except other positions in bight, laying depth is 25mm;
Step D, after having laid through step B and step C, has carried out electrical roasting to curved cathode aluminium cell, and control roasting voltage lower than 3.5V, the roasting of curved cathode aluminium cell corner positions is 850 DEG C to temperature, and other position also roasting to temperature is 850 DEG C;
Step e, after roasting completes, is poured into ionogen and starts, remain baking mixed medium and eliminated by salvaging mode together with burnt grain.
Embodiment 3
A roasting method for curved cathode aluminium cell, comprises the steps:
Steps A, mixes waste and old cathode carbon block and Graphite Powder 99 by following mass percent, namely forms a kind of baking mixed medium:
Graphite Powder 99 13%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%;
Described waste and old cathode carbon block is after aluminium cell overhaul, clean with the magazins' layout such as insulating brick, refractory brick, ionogen, and the waste carbon cellulosic material of moisture content (w/w) < 1 ‰, particle diameter is 6mm;
Step B, being layed in the baking mixed homogeneous media in described steps A between the anode and cathode of curved cathode aluminium cell bight, laying depth is 25mm;
Step C, be layed in by burnt for routine grain between the anode and cathode of curved cathode aluminium cell except other positions in bight, laying depth is 30mm;
Step D, after having laid through step B and step C, has carried out electrical roasting to curved cathode aluminium cell, and control roasting voltage lower than 3.5V, the roasting of curved cathode aluminium cell corner positions is 880 DEG C to temperature, and other position roasting to temperature is 950 DEG C;
Step e, after roasting completes, is poured into ionogen and starts, remain baking mixed medium and eliminated by salvaging mode together with burnt grain.
Embodiment 4
A roasting method for curved cathode aluminium cell, comprises the steps:
Steps A, mixes waste and old cathode carbon block and Graphite Powder 99 by following mass percent, namely forms a kind of baking mixed medium:
Graphite Powder 99 15%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%;
Described waste and old cathode carbon block is after aluminium cell overhaul, clean with the magazins' layout such as insulating brick, refractory brick, ionogen, and the waste carbon cellulosic material of moisture content (w/w) < 1 ‰, particle diameter is 5mm;
Step B, being layed in the baking mixed homogeneous media in described steps A between the anode and cathode of curved cathode aluminium cell bight, laying depth is 15mm;
Step C, be layed in by burnt for routine grain between the anode and cathode of curved cathode aluminium cell except other positions in bight, laying depth is 20mm;
Step D, after having laid through step B and step C, has carried out electrical roasting to curved cathode aluminium cell, and control roasting voltage lower than 3.5V, the roasting of curved cathode aluminium cell corner positions is 800 DEG C to temperature, and other position roasting to temperature is 880 DEG C;
Step e, after roasting completes, is poured into ionogen and starts, remain baking mixed medium and eliminated by salvaging mode together with burnt grain.
detect data
Product and the traditional method of embodiment of the present invention 1-4 roasting method gained compare, and result is as shown in table 1.
Table 1
Analyzed from table 1, the temperature head difference of traditional method corner positions and other positions is too large, whole electrolyzer temperature skewness, and thermograde is large, causes opening occurring in groove process that the phenomenon of early damage occurs.And the embodiment of the present invention overcomes above deficiency, the temperature head of corner positions and other positions reduces greatly, effectively avoids to open to occur in groove process that the phenomenon of early damage occurs, and the work-ing life of electrolyzer is increased greatly.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. for the roasting medium in curved cathode aluminium cell bight, it is characterized in that, comprise the following component according to mass percentage:
Graphite Powder 99 5 ~ 15%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%.
2. according to the roasting medium of claim 1 for curved cathode aluminium cell bight, it is characterized in that, described waste and old cathode carbon block is after aluminium cell overhaul, clean with magazins' layout, and the waste carbon cellulosic material of moisture content < 1 ‰, particle diameter is 4-6mm.
3. according to the roasting medium of claim 2 for curved cathode aluminium cell bight, it is characterized in that, it is characterized in that, described particle diameter is 5mm.
4. a roasting method for curved cathode aluminium cell, adopts claim 1-3 any one to be used for the roasting medium in curved cathode aluminium cell bight, it is characterized in that, comprise the steps:
Steps A, mixes waste and old cathode carbon block and Graphite Powder 99 by following mass percent, namely forms a kind of baking mixed medium:
Graphite Powder 99 5 ~ 15%
Waste and old cathode carbon block surplus
Above-mentioned each component summation is 100%;
Step B, being layed in the baking mixed homogeneous media in described steps A between the anode and cathode of curved cathode aluminium cell bight, laying depth is 15-25mm;
Step C, be layed in by burnt for routine grain between the anode and cathode of curved cathode aluminium cell except other positions in bight, laying depth is 20-30mm;
Step D, after having laid through step B and step C, electrical roasting is carried out to curved cathode aluminium cell, controlled roasting voltage lower than 3.5V, curved cathode aluminium cell corner positions roasting to temperature is 800 DEG C ~ 900 DEG C, and other position roasting to temperature is 850 ~ 950 DEG C;
Step e, after roasting completes, is poured into ionogen and starts, remain baking mixed medium and eliminated by salvaging mode together with burnt grain.
5. the roasting method of curved cathode aluminium cell according to claim 4, is characterized in that, the laying depth described in step B is 20mm.
6. the roasting method of curved cathode aluminium cell according to claim 4, is characterized in that, the laying depth described in step C is 25mm.
7. the roasting method of curved cathode aluminium cell according to claim 4, is characterized in that, in step D, corner positions and the equal roasting in other position to temperature are 900 DEG C.
8. adopt the curved cathode aluminium cell that the roasting method roasting of claim 4-8 any one curved cathode aluminium cell obtains.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110747491A (en) * | 2019-11-12 | 2020-02-04 | 云南云铝润鑫铝业有限公司 | Method for roasting electrolytic cell by mixing waste cathode particles and coke particles of electrolytic aluminum |
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|---|---|---|---|---|
| CN101092711A (en) * | 2007-07-09 | 2007-12-26 | 山东南山铝业股份有限公司 | Method for baking scorched particles in aluminum electrolytic cell |
| CN101302628A (en) * | 2008-06-27 | 2008-11-12 | 山东南山铝业股份有限公司 | Aluminum cell waste cathode carbon block used as calcination two electrodes conductive material and method therefor |
| CN102146570A (en) * | 2011-02-26 | 2011-08-10 | 王建军 | Method for producing aluminum anode by using waste cathode carbon block of aluminum cell |
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- 2015-09-24 CN CN201510615078.9A patent/CN105088275A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092711A (en) * | 2007-07-09 | 2007-12-26 | 山东南山铝业股份有限公司 | Method for baking scorched particles in aluminum electrolytic cell |
| CN101302628A (en) * | 2008-06-27 | 2008-11-12 | 山东南山铝业股份有限公司 | Aluminum cell waste cathode carbon block used as calcination two electrodes conductive material and method therefor |
| CN102146570A (en) * | 2011-02-26 | 2011-08-10 | 王建军 | Method for producing aluminum anode by using waste cathode carbon block of aluminum cell |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110747491A (en) * | 2019-11-12 | 2020-02-04 | 云南云铝润鑫铝业有限公司 | Method for roasting electrolytic cell by mixing waste cathode particles and coke particles of electrolytic aluminum |
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Application publication date: 20151125 |