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Process of aluminum dross recycling and life cycle assessment for Al-Si alloys and brown fused alumina

Transactions of Nonferrous Metals Society of China 2010年第11期20卷 2155-2161页

作者：洪建平王俊陈海 孙宝德李家镜陈冲 State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Institute of Marine Materials Science and Engineering Shanghai Ocean University

In 2008,around 596 000 t of aluminum dross was generated from secondary aluminum industry in China;however,it was not sufficiently recycled *** 95% of the Al dross was land filled without innocent *** purpose of this work is to investigate Al dross recycling by environmentally efficient and friendly *** methods of Al dross recycling which could utilize Al dross efficiently were ***-quality aluminum-silicon alloys and brown fused alumina(BFA) were produced successfully by recycling Al ***,life cycle assessment(LCA) was performed to evaluate environmental impact of two methods of Al dross recycling *** results show that the two methods are reasonable and the average recovery rate of Al dross is up to 98%.As the LCA results indicate,they have some advantages such as less natural resource consumption and pollutant emissions,which efficiently relieves the burden on the environment in electrolytic aluminum and secondary aluminum industry.

关键词： aluminum dross life cycle assessment A1-Si alloys brown fused alumina

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Dissolution characteristics of black aluminum dross in Na_(3)AIF_(6)-AIF_(3)-Al_(2)O_(3)molten salt system

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Rare Metals 2023年第8期42卷 2747-2756页

作者： Zheng-Ping Zuo Guo-Qing Yu Chun-Li Liu Gui-Cheng Liu Feng-Qin Liu State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Research Center Heavy Machinery Ministry of Education Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Physics and Oxide Research Center Hankuk University of Foreign StudiesYongin 17035Republic of Korea School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China Department of Physics Dongguk UniversitySeoul 04620Korea

The dissolution performance of black aluminum dross(BAD)in cryolite electrolyte is key to its recovery by molten salt *** stable operation of the electrolyzer depends mainly on the rapid dissolution of BAD in Na_(3)AlF_(6)-AlF_(3)-Al_(2)O_(3)electrolyte *** this paper,the dissolution performance and behavior of BAD and its main components in the cryolite system were studied,and the saturation solubility of aluminum nitride in this system was *** dissolution performance of BAD in cryolite electrolyte before and after denitration was compared,and the effects of temperature,cryolite ratio,and the doping ratio of BAD and alumina on the dissolution rate were *** obtained results showed that aluminum nitride was the main factor affecting the dissolution performance of BAD in the *** nitride was partly converted toα-Al_(2)O_(3)after addition to the electrolyte,and the convertedα-Al_(2)O_(3)was partially dissolved in the cryolite electrolyte,while the remaining precipitated and accumulated at the bottom with aluminum *** nitride was almost insoluble in the cryolite electrolyte,with 0.0022%solubility.A higher proportion ofα-Al_(2)O_(3)in BAD was negatively influenced its solubility in the cryolite *** dissolution rate of BAD in cryolite electrolytes was effectively improved by mixing BAD withγ-Al_(2)O_(3).

关键词： aluminum dross aluminum nitride Kinetics Hydrolysis Dissolution rate

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Extraction and characterization of alumina nanopowders from aluminum dross by acid dissolution process

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International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 429-436页

作者： Saifur Rahman Sarker Zahangir Alam Rakibul Qadir M A Gafur Mohammad Moniruzzaman Department of Applied Chemistry and Chemical Engineering University of Dhaka Pilot Plant & Project Development Centre (PP& PDC) Bangladesh Council of Scientific and Industrial Research (BCSIR) BCSIR Laboratories Dhaka

A significant amount of aluminum dross is available as a waste in foundry industries in Bangladesh. In this study, alumina was ex- tracted from aluminum dross collected from two foundry industries situated in Dhamrai and Manikgang, near the capital city, Dhaka. Alu- minum dross samples were found to approximately contain 75wt% A1203 and 12wt% SIO2. An acid dissolution process was used to recover the alumina value from the dross. The effects of various parameters, e.g., temperature, acid concentration, and leaching time, on the extrac- tion of alumina were studied to optimize the dissolution process. First, AI（OH）3 was produced in the form of a gel. Calcination of the AI（OH）3 gel at 1000℃, 1200℃, and 1400℃ for 2 h produced O-AlcOa, （t~＋O）-A1203, and u-alumina powder, respectively. Thermal charac- terization of the AI（OH）3 gel was performed by thermogravimetric/differential thermal analysis （TG/DTA） and differential scanning calo- rimetry （DSC）. The phases and crystallite size of the alumina were determined by X-ray diffraction analysis. The dimensions of the alumina were found to be on the nano level. The chemical compositions of the aluminum dross and alumina were determined by X-ray fluorescence （XRF） spectroscopy. The microstructure and morphology of the alumina were studied with scanning electron microscopy. The purity of the alumina extracted in this study was found to be 99.0%. Thus, it is expected that the obtained alumina powders can be potentially utilized as biomaterials.

关键词： aluminum dross alumina nanoparticles acid dissolution calcination X-ray fluorescence analysis

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