Method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust

Abstract

The invention discloses a method for selectively and efficiently extracting zinc and removing iron with zinc-containing electric furnace dust as a raw material and belongs to the field of hydrometallurgy. The raw material is the zinc-containing electric furnace dust, an extracting agent is ammonium ferric sulfate dodecahydrate (NH4Fe(SO4)2.l2H2O), the extracting process includes the steps that the zinc-containing electric furnace dust is washed and dried to be evenly mixed with the ammonium ferric sulfate dodecahydrate according to a certain mass ratio, the mixture is placed in an airtight reaction still to be subjected to a hydrothermal reaction for a certain period of time at a certain temperature, the reaction product is taken out to be placed into a centrifugal device, a proper amount of water is added, solid and liquid are separated after stirring, and a zinc-containing leaching agent and iron-containing leaching residues are obtained. The process is simple, the purposes that zinc is extracted efficiently and iron is removed can be achieved through one step, the leaching rate of zinc is over 93%, the leaching rate of iron is lower than 2%, and most of iron is remained in the leaching residues; and the solid-liquid separation process is easy to conduct. By the adoption of the method, zinc can be extracted selectively and efficiently from the zinc-containing electric furnace dust, operation is easy, and the method is a novel method for selectively and efficiently extracting zinc from the zinc-containing electric furnace dust.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and particularly relates to a method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust by adding an extractant in one step by using a hydrothermal method. Background technique [0002] As an important non-ferrous metal, zinc has been widely used in various fields of social life. The production and consumption of zinc in my country ranks first in the world. The increase in zinc production and consumption has prompted the society to pay more attention to the recovery, regeneration and utilization of zinc. However, the recovery, regeneration and utilization of zinc in China are far behind the advanced countries in the world, resulting in the waste of resources, energy and water resources and environmental pollution. Therefore, it is of great significance to improve the recovery, regeneration and utilization level of zinc in our country. [0...

AI Technical Summary

Problems solved by technology

Although traditional alkaline leaching or ammonia leaching has good selectivity to the extraction of zinc, these two methods cannot extract zinc in zinc ferrite, resulting in very low extraction efficiency of zinc ((1) H.X.Li, Y.Wang , D.Q.Cang.J.Cent.SouthUniv.Technol., 17(2010) 967-971. (2) S.Amer, J.M.Figueiredo, A.Luis.Hydrometallurgy, 37(1995) 323-337.)

Although the acid leaching method can efficiently (generally >85%) leach zinc from zinc-containing electric furnace dust, its selectivity is poor, and other metal elements (Mn, Pb, Fe, Ca, etc.), especially Fe, and Zn Together into the leachate (F.Kukurugya, T.Vindt, T.Havlík.Hydrometallurgy 154 (2015) 20-32.), resulting in a rather complicated purification process for the subsequent leachate, resulting in a greater loss of zinc in the leachate

Therefore, how to efficiently extract zinc from zinc-containing electric furnace dust while reducing the leaching of iron is the biggest problem for metallurgists, and there are few research reports on this aspect

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