Method for recycling spent carbon cathode of aluminum electrolysis

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United States of America Patent

PATENT NO 11697594
APP PUB NO 20230120820A1
SERIAL NO

17764561

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Abstract

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A method for recycling spent carbon cathode of aluminum electrolysis includes the following steps: (1) crushing and sieving spent carbon cathode, to obtain carbon particles; (2) mixing the carbon particles with a sulfuric acid solution, to obtain a slurry A, and then performing pressure leaching, to obtain a slurry B; (3) evaporating and concentrating the slurry B until a mass percentage of water is lower than 8%, to obtain a slurry C; (4) adding concentrated sulfuric acid to the slurry C to obtain a slurry D, then roasting the slurry D at 150-300° C. for 0.5-10 h, and then roasting at 300-600° C. for 0.5-8 h, to obtain the roasted carbon; and calcining the roasted carbon at a high temperature, to obtain the purified carbon, or mixing the roasted carbon with a leaching agent, and performing leaching, filtering, and washing, to obtain the purified carbon.

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Patent Owner(s)

Patent OwnerAddress
CENTRAL SOUTH UNIVERSITYYUELU DISTRICT CITY HUNAN PROVINCE 410083 CHANGSHA LUSHAN ROAD NO 932 CHANGSHA CITY HUNAN PROVINCE 410083

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gong, Peiyu Changsha, CN 1 0
Hong, Bo Changsha, CN 72 3661
Lai, Yanqing Changsha, CN 3 0
Li, Jie Changsha, CN 741 3601
Li, Yifan Changsha, CN 206 2019
Tian, Zhongliang Changsha, CN 2 5
Yang, Kai Changsha, CN 283 2593

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