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Method for separating electrolyte in aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon
The invention relates to a method for separating electrolyte in an aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon, and belongs to the technical field of nonferrous metallurgy. The method comprises the following steps: crushing an aluminum electrolysis waste cathode carbon block into waste cathode carbon particles, sequentially carrying out water washing, screening, drying and grinding silica to obtain silica particles, and uniformly mixing the waste cathode carbon particles and the silica particles to obtain a mixture A; and reacting the mixture A at 1450-1600 DEG C under a vacuum condition for 1-5 hours, and performing solid-liquid-gas three-phase separation to obtain gas-phase electrolyte, liquid metal silicon and solid slag. According to the method, silicon dioxide is subjected to carbon thermal reduction at the temperature of 1450-1600 DEG C under the vacuum condition through waste cathode carbon particles to obtain metal silicon, meanwhile, the gaseous electrolyte is separated out, the cost of pure vacuum separation of the electrolyte in the waste cathode is reduced, the recovery rate of the electrolyte is increased, and meanwhile high-value utilization of carbon in the waste cathode is achieved.
本发明涉及一种分离铝电解废阴极碳块中电解质并同步生产金属硅的方法，属于有色冶金技术领域。本发明将铝电解废阴极碳块破碎成废阴极碳颗粒，将硅石依次进行水洗、筛分、干燥和研磨得到硅石颗粒，废阴极碳颗粒和硅石颗粒混合均匀得到混合物A；混合物A在温度1450‑1600℃、真空条件下反应1～5h，固液气三相分离得到气相电解质、液态金属硅和固态渣。本发明利用废阴极碳颗粒在温度1450‑1600℃、真空条件下碳热还原二氧化硅得到金属硅，同时分离出气态电解质，降低了单纯真空分离废阴极中电解质的成本，并提高了电解质的回收率，同时实现了废阴极中碳的高值化利用。
Method for separating electrolyte in aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon
The invention relates to a method for separating electrolyte in an aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon, and belongs to the technical field of nonferrous metallurgy. The method comprises the following steps: crushing an aluminum electrolysis waste cathode carbon block into waste cathode carbon particles, sequentially carrying out water washing, screening, drying and grinding silica to obtain silica particles, and uniformly mixing the waste cathode carbon particles and the silica particles to obtain a mixture A; and reacting the mixture A at 1450-1600 DEG C under a vacuum condition for 1-5 hours, and performing solid-liquid-gas three-phase separation to obtain gas-phase electrolyte, liquid metal silicon and solid slag. According to the method, silicon dioxide is subjected to carbon thermal reduction at the temperature of 1450-1600 DEG C under the vacuum condition through waste cathode carbon particles to obtain metal silicon, meanwhile, the gaseous electrolyte is separated out, the cost of pure vacuum separation of the electrolyte in the waste cathode is reduced, the recovery rate of the electrolyte is increased, and meanwhile high-value utilization of carbon in the waste cathode is achieved.
本发明涉及一种分离铝电解废阴极碳块中电解质并同步生产金属硅的方法，属于有色冶金技术领域。本发明将铝电解废阴极碳块破碎成废阴极碳颗粒，将硅石依次进行水洗、筛分、干燥和研磨得到硅石颗粒，废阴极碳颗粒和硅石颗粒混合均匀得到混合物A；混合物A在温度1450‑1600℃、真空条件下反应1～5h，固液气三相分离得到气相电解质、液态金属硅和固态渣。本发明利用废阴极碳颗粒在温度1450‑1600℃、真空条件下碳热还原二氧化硅得到金属硅，同时分离出气态电解质，降低了单纯真空分离废阴极中电解质的成本，并提高了电解质的回收率，同时实现了废阴极中碳的高值化利用。
Method for separating electrolyte in aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon
一种分离铝电解废阴极碳块中电解质并同步生产金属硅的方法
YAN HENGWEI (author) / GAO JIYAN (author) / MA WENHUI (author) / XU BAOQIANG (author) / LIU ZHANWEI (author) / XIE KEQIANG (author) / WEI KUIXIAN (author) / LI SHAOYUAN (author) / QIN BO (author) / LYU GUOQIANG (author)
2021-08-20
Patent
Electronic Resource
Chinese
IPC:
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C01D
Verbindungen der Alkalimetalle, d.h. des Lithiums, Natriums, Kaliums, Rubidiums, Cäsiums oder Franciums
,
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
/
C04B
Kalk
,
LIME
/
C25C
Verfahren für die elektrolytische Herstellung, Wiedergewinnung oder Raffination von Metallen
,
PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS
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