| abstract |
Red mud is waste residue generated in the process of extracting aluminum oxide in the aluminum industry, is red due to the iron oxide, and is called red mud. The red mud is the largest waste residue generated in the production of alumina, and brings heavy burden to social environment. Production enterprises rely on large-area open-air places for stacking, and most of the dam bodies of the stacking fields are constructed by red mud. Many available components in the red mud are not developed yet, and resource waste is caused. With the rapid development of the aluminum industry and the reduction of ore grade, the red mud output will be larger and larger, so the recovery and utilization of red mud resources have become increasingly major research subjects and directions. The invention is characterized in that the red mud is sintered in a rotary kiln, iron oxide is changed into sodium ferrite at the temperature of 600-700 ℃, the sodium ferrite is hydrolyzed into ferric hydroxide, and the ferric hydroxide is removed by primary amine N-1923 reagent. And (3) recovering aluminum oxide, magnesium and calcium chloride, and recovering sodium chloride and recycling water. And (3) recycling ferroferric oxide by a residue magnetic separation method, and making bricks by using the residue and coal gangue. |