Dross can be maintained at these high temperatures until approximately 95% 99% % or other relevant amount of the salt in the dross has evaporated In some cases dross can be maintained at these high temperatures for approximately 30 minutes 35 minutes 40 minutes 45 minutes 50 minutes 55 minutes 60 minutes 65 minutes 70 minutes 75 minutes 80 minutes
·Befesa recycles aluminum dross salt slags and other residues from secondary aluminum producers and uses SPL to reduce energy input requirements The current export options for SPL management include mineral wool Rockwool manufacture in Germany and Spain However mineral wool manufacture is only suited to blocks of first cut SPL processing
·Whilst a number of workers have considered the recovery of valuables mostly metallic aluminium from aluminium dross Zhang 2006 Peterson and Newton 2002 Schlesinger 2000 and Bruckard et al 2004 few studies have been conducted on the salt cakes derived from that have Bahr and Kues 1978 and Gil 2005 Gil
Salt components of dross can be extracted efficiently through evaporation During dross treatment temperatures can be permitted to approach or exceed the boiling point of one or more salt components of the dross preferably in an oxidizing environment The temperature can be held sufficiently high such that the salt content can exert an appreciable vapor pressure and
·in the dross depends on the practice of molten metal processing II ALUMINUM DROSS CRUSHER So in order accelerate the recovery rate of aluminum from aluminum dross special purpose aluminum dross crusher has been fabricated in our earlier research paper and as shown in Fig 1 As it involved rapid rotary motion huge amount of
·Decomposition of the non metallic residue after the removal of salt from dross with water leaching was also carried out by NaOH leaching for 8 h at °C [16] [32] The precipitation of aluminium hydroxide was achieved by adjusting the pH pH = 7 with sulphuric acid whereas aluminium oxide with Al 2 O 3 content % was recovered
·Salt slag a mixture of salts aluminium oxide aluminium metal and impurities is a typical residue generated during remelting of scrap/dross under a salt layer in rotary furnaces up to 500 kg of salt slag per tonne of aluminium metal As it has been classified as toxic and hazardous waste highly flammable irritant harmful and leachable
·The solid waste at the end of this stage which is known as black dross or salt cake is deposited in landfill sites Lazzaro et al 1994 Download Download high res image 149KB Download Download full size image; Their process consists of four steps 1 crushing initial black dross by a jaw crusher into pieces smaller than 1 mm and the
·Black dross comprises a range of 7 50 wt% of entrapped metallic aluminium Furthermore in addition to black dross there exist two additional variations of aluminium dross white dross characterized by the highest metallic content ranging from 15 to 80 wt% and salt cakes which exhibit the lowest metallic content at 3 10 wt% [1]
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