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Treatment method of aluminum electrolysis waste cathode carbon block based on magnesium cementing material
The invention discloses an aluminum electrolysis waste cathode carbon block treatment method based on a magnesium cementing material, and belongs to the technical field of harmless treatment and recycling of aluminum electrolysis waste cathode carbon blocks. According to the method, the waste cathode carbon blocks are subjected to particle size grade screening, particles with fine particle sizes are acidified, part or all coarse particles are halogenated, the surfaces and holes of the coarse particles are rich in halogenating agents through halogenation, then the coarse particles react with active MgO to form magnesium cement filling layers and wrapping layers, toxic elements in the coarse particles are prevented from seeping out, and therefore the service life of the waste cathode carbon blocks is prolonged. Finally, the acidified fine particles, the halogenated coarse particles and dead burned MgO are mixed and react to form magnesium cement, the formed magnesium cement can wrap the non-halogenated coarse particles, toxic elements in the non-halogenated coarse particles are prevented from seeping out, direct sealing of the harmful elements in the aluminum electrolysis waste cathode carbon blocks is achieved, and the service life of the aluminum electrolysis waste cathode carbon blocks is prolonged. And high-temperature fluorine-containing flue gas and fluorine-containing wastewater are not generated, the technological process is simple, and the dosage of reagents is small.
本发明公开了一种基于镁质胶凝材料的铝电解废阴极碳块的处理方法，属于铝电解废阴极炭块的无害化处理和再利用技术领域。本发明将废阴极炭块进行粒径等级筛分，对细微粒径的颗粒进行酸化，对部分或全部粗颗粒进行卤化，通过卤化使粗颗粒的表面和孔洞中富含卤化剂，再与活性MgO反应形成镁水泥填补层和包裹层，防止粗颗粒中有毒元素的渗出，最后将酸化后的微细颗粒、卤化后的粗颗粒与死烧MgO混合反应形成了镁质水泥，形成的镁质水泥能够对未卤化的粗颗粒进行包裹，防止其中有毒元素的渗出，实现了铝电解废阴极炭块中有害元素的直接封存，且不产生高温含氟烟气和含氟废水、工艺过程简单、试剂用量少。
Treatment method of aluminum electrolysis waste cathode carbon block based on magnesium cementing material
The invention discloses an aluminum electrolysis waste cathode carbon block treatment method based on a magnesium cementing material, and belongs to the technical field of harmless treatment and recycling of aluminum electrolysis waste cathode carbon blocks. According to the method, the waste cathode carbon blocks are subjected to particle size grade screening, particles with fine particle sizes are acidified, part or all coarse particles are halogenated, the surfaces and holes of the coarse particles are rich in halogenating agents through halogenation, then the coarse particles react with active MgO to form magnesium cement filling layers and wrapping layers, toxic elements in the coarse particles are prevented from seeping out, and therefore the service life of the waste cathode carbon blocks is prolonged. Finally, the acidified fine particles, the halogenated coarse particles and dead burned MgO are mixed and react to form magnesium cement, the formed magnesium cement can wrap the non-halogenated coarse particles, toxic elements in the non-halogenated coarse particles are prevented from seeping out, direct sealing of the harmful elements in the aluminum electrolysis waste cathode carbon blocks is achieved, and the service life of the aluminum electrolysis waste cathode carbon blocks is prolonged. And high-temperature fluorine-containing flue gas and fluorine-containing wastewater are not generated, the technological process is simple, and the dosage of reagents is small.
本发明公开了一种基于镁质胶凝材料的铝电解废阴极碳块的处理方法，属于铝电解废阴极炭块的无害化处理和再利用技术领域。本发明将废阴极炭块进行粒径等级筛分，对细微粒径的颗粒进行酸化，对部分或全部粗颗粒进行卤化，通过卤化使粗颗粒的表面和孔洞中富含卤化剂，再与活性MgO反应形成镁水泥填补层和包裹层，防止粗颗粒中有毒元素的渗出，最后将酸化后的微细颗粒、卤化后的粗颗粒与死烧MgO混合反应形成了镁质水泥，形成的镁质水泥能够对未卤化的粗颗粒进行包裹，防止其中有毒元素的渗出，实现了铝电解废阴极炭块中有害元素的直接封存，且不产生高温含氟烟气和含氟废水、工艺过程简单、试剂用量少。
Treatment method of aluminum electrolysis waste cathode carbon block based on magnesium cementing material
一种基于镁质胶凝材料的铝电解废阴极碳块的处理方法
KWON CHAE-HYOUNG (author)
2024-11-26
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
| European Patent Office | 2023
| European Patent Office | 2021