A method for removing (sub) ferricyanide complex

Abstract

The invention discloses a method for removing (sub)ferricyanide complexes. The method is to add common complexing agents and acid, and the solution is heated to a certain temperature to destroy the complexation balance between cyanide and iron, so that the iron ion and the added complexing agent are complexed, thereby releasing the process of cyanide ion, the released cyanide ion and acid Combined to generate hydrogen cyanide molecules, which overflow from the solution at high temperature and are absorbed by lye for reuse or further processing. The invention has good treatment effect, high treatment efficiency, stable system operation, and simple process flow; the cyanide ion released during the treatment process can be recovered and reused, and if it is not used, it can be treated with a common simple cyanide treatment method .

Description

Technical field

[0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for treating waste water containing (ferrous) cyanide complexes and other metal cyanide complexes. Background technique

[0002] In the production process of gold mines, a large amount of cyanide-containing wastewater is generated due to the use of cyanidation gold extraction technology. This part of the cyanide-containing wastewater contains not only relatively easy to treat releasable cyanide, thiocyanate and other heavy metals, but also a large amount of Metal cyanide complexes. Releasable cyanide and thiocyanate can be treated by traditional treatment methods, and the remaining large amounts of metal cyanide complexes, especially (ferrocyanide complexes) are difficult to remove by traditional simple methods. If this part of the metal cyanide complex is not treated, if the wastewater is reused, it will affect the production index...