CN101922022A - Method for reducing resistivity of prebaked anode - Google Patents
Method for reducing resistivity of prebaked anode Download PDFInfo
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- CN101922022A CN101922022A CN 201010242761 CN201010242761A CN101922022A CN 101922022 A CN101922022 A CN 101922022A CN 201010242761 CN201010242761 CN 201010242761 CN 201010242761 A CN201010242761 A CN 201010242761A CN 101922022 A CN101922022 A CN 101922022A
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Abstract
The invention discloses a method for reducing resistivity of a prebaked anode. The technical scheme comprises the step of adding a proper proportional amount of titanium dioxide or graphite powder to a carbon anodic aggregates used in an electrolytic aluminum industry, which is beneficial to effectively reducing the resistivity, improving the CO2 oxidation resistance, and reducing power consumption on electrolysis and electrolytic production cost.
Description
Technical field
The present invention relates to the preparing technical field of aluminum electrolysis carbon anode, relate in particular to a kind of method that reduces resistivity of prebaked anode.
Background technology
Carbon anode is as " heart " of prebaked cell, requires it to have good electrical conductivity, stronger oxidation-resistance etc.Carbon anode is aggregate with the after-smithing petroleum coke, is that operation processing such as binding agent is pinched through mixing, moulding, roasting are made with the coal-tar pitch to have stable geometrical shape, also claims the prebaked anode carbon piece.
The quality of carbon anode has very big related with technico-economical comparisones such as current efficiency, power consumption even quality product in the Aluminium Electrolysis process; Particularly the resistivity index is an anode high-quality whether major criterion.Because power consumption accounts for 30%～40% of cost on ton aluminium production cost.Every reduction by the 1 μ Ω m of charcoal piece resistivity can reduce bath voltage 2.59mv, and one millivolt of pressure drop of every reduction reduces power consumption 3.2Kwh/t-Al; Every reduction by 10 Ω mm of resistivity then
2/ m can save about direct current consumption 82.88kwh/t-Al.
Therefore, improve the conductivity of carbon anode as early as possible, the resistivity that reduces carbon anode is for reducing the task of top priority of aluminum electrolysis industry energy consumption.
Summary of the invention
The embodiment of the invention provides a kind of method that reduces resistivity of prebaked anode, by add titanium dioxide or Graphite Powder 99 in the carbon anode aggregate, strengthens the carbon anode conductivity, further reduces electrolysis energy consumption, realizes energy-saving and emission-reduction.
For achieving the above object, the embodiment of the invention provides following technical scheme:
A kind of method that reduces resistivity of prebaked anode adds titanium dioxide or Graphite Powder 99 in the anode aggregate.
Further, adding weight ratio in the anode aggregate is the titanium dioxide of thickener gross weight 0.003-0.028%.
Further, adding weight ratio in the anode aggregate is the titanium dioxide of aggregate gross weight 0.013-0.023%.
Perhaps, adding weight ratio in the anode aggregate is the Graphite Powder 99 of aggregate gross weight 0.1-0.5%.
Further, after the anode aggregate adds described titanium dioxide or Graphite Powder 99, mix, be heated to 150-200 ℃, cooling forming with pitch.
Further, described pitch comprises mid-temperature pitch or modified pitch.
The embodiment of the invention comprises that also pouring the anode paste behind the mixing into mould presses sample and roasting, and wherein the temperature of roasting was divided into the next stage: adopt the speed of 71 ℃/h, be warming up to 270 ℃ behind the 3.5h; Adopt the speed of 50 ℃/h, be warming up to 670 ℃ behind the 8h; Adopt the speed of 66 ℃/h, be warming up to 1000 ℃ behind the 5h.
The embodiment of the invention also comprises: at 1000 ℃ of insulation 3h.
Compared with prior art, the present invention adds titanium dioxide or Graphite Powder 99 in the carbon anode aggregate, and concrete effect is as follows:
1, utilizes the electroconductibility of titanium dioxide or Graphite Powder 99 excellence, effectively reduce the plate resistance rate, and then reduce electrolytic power consumption, reduce the electrolysis cost;
2, along with the increase of titanium dioxide or Graphite Powder 99 adding proportion, CO
2The cumulative height of reactive residual anode ratio, anti-CO
2Oxidation susceptibility promotes to some extent, reduces anode loss.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use among the embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the heating curve figure that the embodiment of the invention makes anodic 19.5h roasting;
Fig. 2 is the graph of a relation that the embodiment of the invention makes the resistivity and the titanium dioxide adding proportion of anode sample;
Fig. 3 is the graph of a relation that the embodiment of the invention makes the resistivity and the Graphite Powder 99 adding proportion of anode sample.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention increases anode conducting by adding a certain proportion of titanium dioxide or Graphite Powder 99 in the anode aggregate, reduces the plate resistance rate.
The solid or Powdered that is white in color under titanium dioxide (titanium dioxide, the titanium dioxide) normal temperature has semiconductor property.Chemical formula TiO
2, molecular weight 79.9,1830～1850 ℃ of fusing points, 2500～3000 ℃ of boiling points, density is at 3.70-4.20 (g/cm
3) in the scope, have excellent conducting performance, and increase sharply with the rising of temperature.Ti0
2In the time of 20 ℃ or electrical insulator, but when being heated to 420 ℃, its specific conductivity has increased by 107 times.Titanium dioxide can decompose extraction with acid by rutile, or is obtained by the titanium tetrachloride decomposition.The titanium dioxide stable in properties, a large amount of as the white pigment in the paint, enamelled matting agent, production ceramic condenser, refractory glass, glaze, enamel, potter's clay, resistant to elevated temperatures experimental ware etc.
Graphite Powder 99 adopts perfect crystalline, the crystalline graphite powder of the thin and good toughness of sheet, and physicochemical property is stable, has good temperature tolerance, oilness, conductivity, heat-shock resistance, erosion resistance, oxidation-resistance etc.Be widely used in the pencil-lead of metallurgical refractory materials and cast paint, releasing agent, war industry firer material tranquilizer, light industry, the carbon of electrical industry, the electrode of battery industry, the catalyzer of chemical fertilizer industry etc.
The anode formula that the embodiment of the invention adopts is material and a content commonly used in the industry, is that those skilled in the art know technology, does not repeat them here.
The comparative example,
Present embodiment is a Comparative Examples, does not add titanium dioxide or Graphite Powder 99 in anode paste.
Take by weighing aggregate 3Kg at different levels by anode formula, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 150 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, referring to Fig. 1, can adopt 19.5h roasting curve, and temperature is 1000 ℃ eventually:
| Temperature range | Temperature rise rate | Heating-up time | |
| Room temperature-270 ℃ | 71℃/h | 3.5h | |
| 270-670℃ | 50℃/h | 8h | |
| 670-1000℃ | 66℃/h | 5h | |
| 1000 ℃ of |
0℃/ | 3h | |
| 1000 ℃-room temperature | Freely lower the temperature | More than the 48h |
" two is fast, and is middle slow " principle is followed in the setting of above-mentioned roasting curve, guarantee to improve temperature rise rate under the indehiscent prerequisite of sample as far as possible, helps improving charcoal piece output like this, reduces charcoal piece production energy consumption.
Detecting the anode sample resistivity that this comparative example makes is 62.92 μ Ω m, CO
2Reactive residual anode ratio is 63.60%.
All embodiment of the present invention adopt the method in " YS/T 63.2-2006| aluminium carbon material detection method part 2: the mensuration of cathode carbon pieces and prebaked anode room temperature resistivity " to measure the plate resistance rate; Adopt " YS/T 63.12-2006 aluminium carbon materials detection method the 12nd part: prebaked anode CO
2Reactive quality measurement loss method " in the method measure CO
2Reactive residual anode ratio.
It below is specific embodiment; Wherein all use modified pitch as binding agent, but those skilled in the art should learn that the employing mid-temperature pitch can be realized the embodiment of the invention.
Embodiment one,
Take by weighing aggregate 9Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.003%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 160 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 61.32 μ Ω m, CO
2The reaction residual anode ratio is 63.90%.
CO
2The reaction residual anode ratio refers to anode and CO
2Reacted residual content; CO
2The reaction residual anode ratio is high more, can illustrate that more this anode matter is close hard, and antioxidant property is strong more, and quality is good more.
Embodiment two,
Take by weighing aggregate 4Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.008%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 185 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 57.47 μ Ω m, CO
2The reaction residual anode ratio is 68%.
Embodiment three,
Take by weighing aggregate 3Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.010%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 175 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 57.65 μ Ω m, CO
2The reaction residual anode ratio is 70%.
Embodiment four,
Take by weighing aggregate 6Kg at different levels by anode formula, adding accounts for aggregate weight ratio 0.013% titanium dioxide, pours into to mix in the kneading machine and pinches evenly, adds the modified pitch powder in 10 minutes, mixes and pinches 10 minutes, is heated to 180 ℃ then, taking-up after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 57.92 μ Ω m, CO
2The reaction residual anode ratio is 73%.
Embodiment five,
Take by weighing aggregate 8Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.015%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 192 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 55.84 μ Ω m, CO
2The reaction residual anode ratio is 84%.
Embodiment six,
Take by weighing aggregate 4Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.018%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 195 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 55.38 μ Ω m, CO
2The reaction residual anode ratio is 83.5%.
Embodiment seven,
Take by weighing aggregate 4Kg at different levels by anode formula, adding accounts for aggregate weight ratio 0.020% titanium dioxide, pours into to mix in the kneading machine and pinches evenly, adds the modified pitch powder after 10 minutes, mixes and pinches 10 minutes, is heated to 200 ℃ then, taking-up after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 56.17 μ Ω m, CO
2The reaction residual anode ratio is 83%.
Embodiment eight,
Take by weighing aggregate 3Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.023%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 158 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 57.91 μ Ω m, CO
2The reaction residual anode ratio is 74.4%.
Embodiment nine,
Take by weighing aggregate 4Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.025%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 165 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 58.41 μ Ω m, CO
2The reaction residual anode ratio is 83%.
Embodiment ten,
Take by weighing aggregate 3Kg at different levels by anode formula, add the titanium dioxide that accounts for aggregate weight ratio 0.028%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 170 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 59.32 μ Ω m, CO
2The reaction residual anode ratio is 75.3%.
To sum up, the anode properties of sample that makes of embodiment one to embodiment ten is as shown in the table:
Referring to Fig. 2, the titanium dioxide ratio of adding in the anode sample that each embodiment makes and the curve relation figure of room temperature resistivity.Find out from figure: along with the increase of titanium dioxide adding proportion, resistivity integral body is obvious downtrending.Addition is 0.01%～0.02% when interval, and resistivity decreased trend is the most remarkable, and the trend of the zone performance trend that slightly rebounds after 0.02%, but the resistivity integral level still is lower than the blank sample resistivity of not adding titanium dioxide.
The blank sample resistivity mean value that does not add titanium dioxide is 62.92 μ Ω m, and addition reaches at 0.013% o'clock, and resistivity is reduced to 57.92 μ Ω m, compares with 0% blank sample, and resistivity reduction value is 5.0 μ Ω m; Addition reaches at 0.018% o'clock, and resistivity has reduced by 7.54 μ Ω m.This has demonstrated fully titanium dioxide as electro-conductive material, effectively reduces the active effect of plate resistance rate.
Below for adding the embodiment of Graphite Powder 99.
Embodiment 11,
Take by weighing aggregate 3Kg at different levels by anode formula, add the Graphite Powder 99 that accounts for aggregate weight ratio 0.1%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 157 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 54.83 μ Ω m, CO
2The reaction residual anode ratio is 72.96%.
Take by weighing aggregate 5Kg at different levels by anode formula, add the Graphite Powder 99 that accounts for aggregate weight ratio 0.2%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 165 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 54.47 μ Ω m, CO
2The reaction residual anode ratio is 75%.
Embodiment 13,
Take by weighing aggregate 4Kg at different levels by anode formula, add the Graphite Powder 99 that accounts for aggregate weight ratio 0.3%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 185 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 54.15 μ Ω m, CO
2The reaction residual anode ratio is 76.5%.
Take by weighing aggregate 8Kg at different levels by anode formula, add the Graphite Powder 99 that accounts for aggregate weight ratio 0.5%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 195 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 53.84 μ Ω m, CO
2Reaction residual anode ratio increased value is 82.47%.
Embodiment 15,
Take by weighing aggregate 5Kg at different levels by anode formula, add the Graphite Powder 99 that accounts for aggregate weight ratio 1.0%, pour into to mix in the kneading machine and pinch evenly, add the modified pitch powder after 10 minutes, mix again and pinched 10 minutes, be heated to 170 ℃ then, take out after 40 minutes.
After thickener leaves standstill 1 hour, be baked to 200 ℃, will press original mold tool intensification mould drying simultaneously, take out thickener after 50 minutes and press the original mold tool.Pour thickener in the matrix cavity of pressing original mold tool tamping and flat surface within 1 minute, place under the hydropress, press 0.5N/mm
2The speed of s is pressed sample, reaches volume density 1.65g/cm
3Scale marks after close the hydropress throttle, the demoulding is carried out in pressurize during to 40KN.
The anode sample that present embodiment is made carries out roasting, and the roasting curve that adopts during roasting is identical with the comparative example.
Recording the anode sample resistivity that present embodiment makes is 54.11 μ Ω m, CO
2The reaction residual anode ratio is 78.13%.
To sum up, the anode properties of sample that makes of embodiment 11 to embodiment 15 is as shown in the table:
Referring to Fig. 3, the Graphite Powder 99 ratio of adding in the anode sample that each embodiment makes and the curve relation figure of room temperature resistivity.Find out from figure: along with the increase of Graphite Powder 99 adding proportion, resistivity integral body is obvious downtrending.Addition is when 0.1%～0.5% interval, and resistivity decreased trend is mild, maintains between the 53-55 μ Ω m; 0.5% interval after the trend of the zone performance trend that slightly rebounds, but the resistivity integral level still is lower than the blank sample resistivity of not adding Graphite Powder 99.
More than a kind of method that reduces resistivity of prebaked anode that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in summary, this description should not be construed as limitation of the present invention.
Claims (9)
1. a method that reduces resistivity of prebaked anode is characterized in that, adds titanium dioxide or Graphite Powder 99 in the anode aggregate.
2. according to the method for the described reduction resistivity of prebaked anode of claim 1, it is characterized in that adding weight ratio in the anode aggregate is the titanium dioxide of thickener gross weight 0.003-0.028%.
3. the method for reduction resistivity of prebaked anode according to claim 2 is characterized in that, adding weight ratio in the anode aggregate is the titanium dioxide of aggregate gross weight 0.013-0.023%.
4. the method for reduction resistivity of prebaked anode according to claim 1 is characterized in that, adding weight ratio in the anode aggregate is the Graphite Powder 99 of aggregate gross weight 0.1-0.5%.
5. the method for reduction resistivity of prebaked anode according to claim 1 is characterized in that, after the anode aggregate adds described titanium dioxide or Graphite Powder 99, mixes with pitch, is heated to 150-200 ℃, cooling forming.
6. the method for reduction resistivity of prebaked anode according to claim 5 is characterized in that, described pitch comprises mid-temperature pitch or modified pitch.
7. the method for reduction resistivity of prebaked anode according to claim 5 is characterized in that, comprises that also pouring the anode paste behind the mixing into mould presses sample and roasting.
8. the method for reduction resistivity of prebaked anode according to claim 7 is characterized in that, the temperature of described roasting was divided into the next stage: adopt the speed of 71 ℃/h, be warming up to 270 ℃ behind the 3.5h; Adopt the speed of 50 ℃/h, be warming up to 670 ℃ behind the 8h; Adopt the speed of 66 ℃/h, be warming up to 1000 ℃ behind the 5h.
9. the method for reduction resistivity of prebaked anode according to claim 8 is characterized in that, also comprises: at 1000 ℃ of insulation 3h.
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| CN103255438A (en) * | 2013-05-24 | 2013-08-21 | 贵州师范大学 | Preparation method of modified pre-baked carbon anode containing titanium additive |
| CN104919090A (en) * | 2012-12-31 | 2015-09-16 | 美铝公司 | Methods for determining green electrode electrical resistivity and methods for making electrodes |
| CN112457015A (en) * | 2020-12-21 | 2021-03-09 | 柯良节 | Novel graphite radiator and preparation method thereof |
| CN112853403A (en) * | 2021-01-11 | 2021-05-28 | 山西沁新能源集团股份有限公司 | Prebaked anode, and preparation method and application thereof |
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| CN101054692A (en) * | 2007-02-08 | 2007-10-17 | 秦晓明 | Method of reducing resistance of anode carbon block set |
| CN101643922A (en) * | 2009-09-10 | 2010-02-10 | 中国铝业股份有限公司 | Method for producing aluminum alloy and special pre-baking carbon anode block thereof |
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| CN1485465A (en) * | 2003-09-02 | 2004-03-31 | 中国铝业股份有限公司 | Method for producing semi-graphite prebaked anode |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104919090A (en) * | 2012-12-31 | 2015-09-16 | 美铝公司 | Methods for determining green electrode electrical resistivity and methods for making electrodes |
| CN104919090B (en) * | 2012-12-31 | 2018-03-13 | 美铝美国公司 | It is determined that method of the method for raw electrode resistance rate with making electrode |
| CN103255438A (en) * | 2013-05-24 | 2013-08-21 | 贵州师范大学 | Preparation method of modified pre-baked carbon anode containing titanium additive |
| CN112457015A (en) * | 2020-12-21 | 2021-03-09 | 柯良节 | Novel graphite radiator and preparation method thereof |
| CN112853403A (en) * | 2021-01-11 | 2021-05-28 | 山西沁新能源集团股份有限公司 | Prebaked anode, and preparation method and application thereof |
| CN112853403B (en) * | 2021-01-11 | 2021-12-07 | 山西沁新能源集团股份有限公司 | Prebaked anode, and preparation method and application thereof |
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