68 results about "Aluminium smelting" patented technology

The invention relates to a preparation method and a using method for a slurry type iron-based red mud arsenic removing agent. The slurry type iron-based red mud arsenic removing agent is prepared by grinding sintering process or Bayer process red mud and manually or mechanically mixing the ground sintering process or Bayer process red mud with ferrous solution at a certain concentration. When used, the slurry type iron-based red mud arsenic removing agent is sprayed by a slurry pump or manually and mixed with water by a water flow or a mechanical force, so that arsenic contaminant in water can be eliminated after standing and precipitating. The chemical contains about 5 to 10 percent of ferrous, about 40 to 50 percent of red mud and about 50 to 55 percent of water. By combining the chemical with the action of arsenic absorption and iron and arsenic coprecipitation, the precipitation performance is high, the form of absorbing arsenic is stable, and secondary contamination is prevented. In the invention, industrial waste from aluminum smelting industry and cheap ferrite are adopted, so the water treatment cost is reduced greatly; and economic and social benefit is created particularly when the agent is used for treating industrial and mining high-arsenic waste water and other industrial and mining high-arsenic waste water and remediating large-area water arsenic contamination.

A raw gas collection system (15) for collecting raw gas from a plurality of aluminium smelting pots (4) is equipped with a plurality of branch ducts (16, 16a-d). Each branch duct (16, 16a-d) is arranged to channel a respective branch flow (32, 32a-b) of raw gas from an aluminium smelting pot (4) to a collecting duct (20a), which is common to and shared by branch ducts (16, 16a-d). Several of the branch ducts (16, 16a-d) are equipped with a combined heat transfer and flow resistance generating element (17) to remove heat from the respective branch flow (32, 32a-b) of raw gas and to balance the flow of raw gas in the raw gas collecting system (15). The combined heat transfer and flow resistance generating elements (17) reduce the need for adjusting the respective branch duct (16, 16a-d) flow volumes using dampers, thereby reducing the power required to transport the raw gas through the system.