How to filter dust which containing zinc-steel and iron

Usually the iron and steel enterprises in the production process to produce most of the soot directly or indirectly after the treatment of sintering, pellets, iron or steel and other production processes. But it contains 800 to 10 million tons of zinc dust, most of its still did not get "efficient" treatment.

For zinc-containing steel dust recovery process are:

1. Physical method

The physical zinc recovery technology is the use of mechanical separation (centrifugal, re-election, etc.) or magnetic separation (magnetic separation) way to enrich the iron and steel dust in zinc. Commonly used mechanical separation methods are flotation a re-election process, hydrocyclone dezincification process; commonly used magnetic separation method has weak magnetic. Combined magnetic and magnetic process. After treatment can be obtained in the high zinc iron and low zinc iron material two kinds of substances, respectively, for zinc and reuse sintering. At present, the vast majority of domestic iron and steel enterprises use this method, although the recovery efficiency is low, but the investment is relatively small.

2. Wet method

Wet zinc recovery technology is the use of zinc oxide insoluble in water or ethanol, but soluble in acid, sodium hydroxide or ammonium chloride and other liquid properties, the use of different leaching solution, the zinc separated from the mixture, suitable for handling high zinc Iron dust.

3. Fire method

Fire zinc recovery technology is the use of zinc boiling point is low, in the reduction of zinc oxide at high temperatures, gasification of zinc and solid phase separation. Fire method is divided into two kinds of direct reduction and melting reduction method, suitable for treatment, high zinc iron dust, which Wilts rotary kiln method and rotary furnace method is the most widely used. Wells rotary kiln technology is currently the domestic and foreign industry that the most effective and economical way to deal with zinc dust.

4. Combined method

The combined method is the combination of the above methods in order to obtain the best method for the recovery of iron, carbon, zinc and other valuable metal effects. Joint law to deal with zinc dust effect is the best, environmental protection and economic benefits can be maximized, but the current master of the entire technology companies rarely.