With the rapid development of the aluminum industry, a large amount of waste slag—red mud—is produced in the alumina production process, which seriously hinders the sustainable development of the aluminum industry.
The radioactive pollution of red mud is huge, and the radioactivity mainly comes from dangerous solid wastes such as radium, thorium, and potassium contained in red mud. Because of its strong radioactivity, red mud has a high cost in waste accumulation management, and its radioactive hazards have seriously restricted the reuse of red mud.
Red mud contains a large amount of strong alkaline chemical substances. If it is stacked in the open air, lye will seep into the ground with rainwater, causing damage to the water ecology and surface soil environment, and easily causing environmental pollution accidents.
The red mud is added with the red mud binder and then pressed into shape. After roasting and strong reduction reaction in an oxygen-free environment, the red mud is dealkalized to produce sodium gas, and simultaneously generate silicon-calcium oxide. After magnetic separation will obtain sponge iron, and the by-product gas generated in the red mud roasting reaction and sodium gas recovery process can be used for the red mud drying furnace, those process eliminating harmful substances and radioactivity in the red mud, which comprehensive utilized and recovered the waste, reach the goal of energy saving and environmental protection.
This technology can also deeply extract metal sodium, sponge iron, metal manganese, metal potassium, metal titanium and other elements, and can produce better comprehensive recycling economic benefits.
Therefore, using the cold pressing process and matching with a suitable red mud binder to recycle red mud can save costs and achieve sustainable development.
article source: https://www.jianjiebinder.com/blog/application-of-jianjie-binder-in-alumina-production-process/
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