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Method for improving rheological property of coal pitch and increasing coking value of coal pitch and modifier thereof
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A technology of coal tar and modifier, applied in the direction of asphalt material binder, adhesive, binder type, etc., can solve the problems of improving the rheological properties of coal tar, not involving carbon for aluminum, etc. Simple, wide-ranging effects
Inactive Publication Date: 2011-11-09
CENT SOUTH UNIV
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[0010] In addition, there are a total of 372 technical inventions related to asphalt modification. It can be found from a summary that, except for the patent "a modified asphalt and its production method" (patent number: 03133782.1, see the above article 1 for detailed description), other inventions Neither involved carbon anodes for aluminum
[0011] To sum up, for the carbon anode binder coal tar pitch used in aluminum electrolysis, there is no related technology that can improve the rheological properties of coal tar pitch by introducing modifiers and ensure that the coking value of coal tar pitch is basically unchanged. invention
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Embodiment 1
[0082] Take the preparation of 100Kg modified coal tar pitch as an example.
[0084] 2) Weigh 1.5Kg of oleic acid, weigh 0.6Kg of superfine graphite powder, and stir and mix the two;
[0085] 3) Weigh 98Kg of coal tar pitch, place it in an asphalt melter and heat it to 190°C, and stir after melting;
[0086] 4) Add the mixture of the above-mentioned weighed oleic acid and ultrafine graphite powder into the stirred molten pitch, and keep stirring at a temperature of 190° C. for 4 hours;
[0087] 5) After the stirring is finished, cool down, take out the pitch and cool it down to obtain the modified coal tar pitch.
Embodiment 2
[0089] Take the preparation of 100Kg modified coal tar pitch as an example.
[0090] 1) Ball mill graphite powder to below 40μm (D50≥70);
[0091] 2) Weigh 2Kg of dibutyl phthalate, weigh 1Kg of ultrafine graphite powder, and stir and mix the two;
[0092] 3) Weigh 97Kg of coal tar pitch, place it in an asphalt melter and heat it to 190°C, and stir after melting;
[0093] 4) Add the above-mentioned weighed mixture of dibutyl phthalate and ultrafine graphite powder into the stirred molten pitch, and keep stirring at a temperature of 190° C. for 5 hours;
[0094] 5) After the stirring is finished, cool down, take out the pitch and cool it down to obtain the modified coal tar pitch.
Embodiment 3
[0096] Take the preparation of 100Kg modified coal tar pitch as an example.
[0097] 1) Ultrafine carbon powder to below 40μm (D50≥70);
[0098] 2) Weigh 3Kg of oleic acid and 1.5Kg of superfine carbon powder, and stir and mix the two evenly;
[0099] 3) Weigh 95.5Kg of coal tar pitch, place it in an asphalt melter and heat it to 190°C, and stir after melting;
[0100] 4) Add the mixture of the above weighed oleic acid and superfine carbon powder into the stirred molten asphalt, and keep stirring at a temperature of 190° C. for 6 hours;
[0101]5) After the stirring is finished, cool down, take out the pitch and cool it down to obtain the modified coal tar pitch.
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Abstract
The invention relates to a method for improving rheological property of coalpitch and increasing a coking value of coalpitch and a modifier thereof. The method achieves the purpose of improving the rheological property of pitch at the kneading temperature of 160 to 180 DEG C under the premise of ensuring the high-temperature coking value of the pitch by adding the multicomponent modifier into molten pitch under the premise of the existing preparation technique of carbon anode for aluminium. The modifier consists of oleic acid or dibutyl phthalate and ultrafine graphitepowder or carbon powder with the granularity of not more than 40mum. The introduction of the multicomponent modifier can enhance the reactivity of anode impedance air and CO2, can reduce the mixing quantity of pitch in the kneading procedure properly and achieve the purpose of improving the anode quality and reducing the flue gas emission of the pitch.
Description
technical field [0001] The invention relates to a method for modifying coaltar pitch, a carbon anode binder used in aluminum electrolysis, and a modifier thereof. Background technique [0002] In the aluminum electrolysis process, the overall quality of the anode has an important impact on the current efficiency, electrolysisenergy consumption, electrolysis production stability and cost. As a binder for carbon anodes, the performance of coal tar pitch is closely related to the quality of the anode. The key properties of coal tar pitch include rheology, coking value, cohesiveness, etc. During use, a problem worthy of attention is how to ensure that coal tar pitch can have good fluidity under the premise of good cohesive properties. Denaturation (capable of fully wrapping carbon aggregates and penetrating into the pores of aggregate particles within an effective time), without affecting its coking value (preventing the reduction of anode density and strength). With the con...
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