Cradle to Gate
Identity ID
85d3fb13-2548-4e0b-b317-e85d68b82cc2
Materials
Associated ID
2b563c0c-9f60-46fc-a8c7-752ee20cde4f
Included activities starts
Included activities ends
Description
Alumina can be used in fields such as the manufacture of refractory materials, electronic substrate materials and the electrolytic production of metallic aluminium; the dataset includes the main raw and auxiliary materials, energy, atmospheric emissions and wastes of the production process, while infrastructure such as production equipment and plant construction is not included within the dataset boundary; the data inventory is taken from the literature; the process flow of alumina production by the Bayer process includes batching and slurrying, pre-desilication, digestion, red-mud separation, seed decomposition and aluminium hydroxide calcination and other process steps. The total alumina output is divided into two parts: metallurgical-grade alumina and non-metallurgical-grade alumina, with metallurgical-grade alumina output accounting for approximately 95-97% of the total alumina output.
Activity Description
The Bayer process for producing alumina includes batching and slurrying, pre-desiliconization, dissolution, red mud separation, seed decomposition and aluminum hydroxide roasting.
Process Description
Aluminum oxide is an inorganic substance with the chemical formula Al2O3, CAS number 1344-28-1, melting point 2054°C, and boiling point 2980°C. It is an ionic crystal that can be ionized at high temperatures. Aluminum oxide can be used in the manufacturing of refractory materials, electronic substrate materials, electrolytic production of aluminum, and other fields.
Time period
2011
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The Bayer process uses higher-grade aluminum ore, mixes it with alkali liquor, lime milk and mother liquor in proportion and grinds it into a slurry. After pre-desiliconization, sodium aluminate is directly dissolved under corresponding temperature and pressure conditions, and then the finished alumina is obtained through processes such as red mud separation, seed decomposition and aluminum hydroxide roasting. For high-grade ores with an aluminum-silicon ratio greater than 7, the Bayer production process is the first choice.