【作者】 李军；

【导师】 刘洪波； 熊建林；

【作者基本信息】 湖南大学 ， 材料工程（专业学位）， 2017， 硕士

【摘要】 铝用炭素阳极作为铝电解工业的关键材料之一,其质量好坏直接关系到铝电解的碳耗、电流效率、生产稳定性、金属铝的纯度等技术指标。而混捏是获得均匀糊料和阳极材料的关键工序。正确的混捏方案可改善阳极性能的差异性,并提高其在电解过程中的使用寿命。本文采用同批次同种原料在实验室条件下制备炭素阳极材料试样,系统研究了混捏温度(150、160、170、180℃)和混捏时间(10、20、30、40min)对铝用炭素阳极性能(开口气孔率、空气渗透率、电阻率、体积密度、抗压强度与空气/CO2的反应性)的影响;测试了不同混捏温度和时间条件下,沥青性能(质量损失、挥发份含量、结焦值和粘度)变化和不同混捏时间对煅后焦粒度分布的影响。得到如下结果:(1)当混捏温度低于170℃时,随着混捏温度升高,阳极开口气孔率和空气渗透性减小,生坯体积密度、阳极体积密度、电阻率、抗压强度、空气反应性和(CO2反应性等性能也随之提高:当混捏温度高于170℃时,随着混捏温度的升高,阳极开口气孔率、空气渗透性增大,生坯体积密度、阳极体积密度、电阻率、抗压强度、空气反应性和CO2反应性等性能降低。(2)当混捏时间小于30min时,随着混捏时间增加,阳极开口气孔率、空气渗透性减小,生坯体积密度、阳极体积密度、电阻率、抗压强度、空气反应性和C32反应性等性能也随之提高;当混捏时间大于30 min时,随着混捏时间的增加,阳极开口气孔率、空气渗透性增大,生坯体积密度、阳极体积密度、电阻率、抗压强度、空气反应性和CO2:反应性等性能降低;(3)随着混捏温度和混捏时间增加,沥青挥发份含量减小,沥青质量损失量、结焦值增大;质量损失量、结焦值增加速率和挥发份含量减小速率随混捏温度增加而增加,随混捏时间增加而减小;(4)随着混捏时间增加,-8mm+5mm和-5mm+2mm两个大粒度范围的煅后焦质量百分比不断下降,而-2mm+0.5mm和-0.5mm+0mm两个小粒度范围的煅后焦质量百分比不断增加。更多还原

【Abstract】 As the important element in the production of aluminum,anode is directly related to the quality of anode consumption,current efficiency,production stability and purity of metal aluminum.The mixing is the key to obtain uniform and optimum performance of the anode paste.The correct mix project design can produce excellent anode to reduce the difference of the anode performance and improve the service life of the electrolytic cell.In this paper,the anode was produced by the same batch of materials in laboratory.In this paper,the influence of different mixing temperatures(150.160.170.180℃)and mixing time(10min,20min.30min and 40min)on the properties(open porosity,permeability,conductive,density of green anode,density.compressive strength and air/CO,reactivity)of carbon anode for aluminum were studied.It were studied the variation of mass loss,volatile content,coke value and viscosity of pith in the different mixing times and mixing temperatures.The changes of granularity of cokes in different mixing times were studied.The results is showed as follow。(1)When mixing temperature was lower than 170℃,as the mixing temperature increased,the open porosity and permeability of anode decreased and the properties(conductive.density of green anode.density,compressive strength and air/CO2 reactivity)of carbon anode were improved.When mixing temperature was higher than 170℃,as the mixing temperature improved.the open porosity and permeability of anode increased and the properties(conductive,density of green anode,density,compressive strength and air/CO,reactivity)of carbon anode were weakened.(2)When mixing time was less than 30min,as the mixing time increased,the open porosity and permeability of anode decreased and the properties(conductive.density of green anode,density.compressive strength and air/CO2 reactivity)of carbon anode were improved.When mixing time exceeded 30min,as the mixing time increased,the open porosity and permeability of anode increased and the properties(conductive,density of green anode,density,compressive strength and air/CO2 reactivity)of carbon anode were weakened.(3)As the mixing temperature and time increased,the volatile content of pith reduced and the mass loss.coke value and viscosity of pith increased.The rates of increase of the mass loss.coke value and viscosity and decrease of volatile increased as the mixing temperature increasing and the mixing time decreasing;(4)As the mixing time increased,the percents of cokes in-/mm+5mm and-5mm+2mm decreased,and the percents of cokes in-2mm+0.5mm and-0.5mm+0mm increased.更多还原