METHOD OF PROCESSING IRON-AND-ZINC-CONTAINING WASTES OF METALLURGICAL PROCESS Russian patent published in 2006 - IPC C22B19/30 C22B19/38 C22B7/02 

FIELD: processing finely-dispersed iron-and-zinc-containing wastes of metallurgical process and byproducts of coke and byproduct process; ferrous and non-ferrous metallurgy.

SUBSTANCE: proposed method consists in thickening finely-dispersed iron-and-zinc-containing wastes, dehydration to moisture content not exceeding 10% and mixing with reductant. Dehydrated iron-and-zinc-containing wastes are mixed with coal tar in the amount of 10-20% of mass of wastes and are nodulized. Then, reducing heat treatment of nodulized wastes is carried out in presence of solid carbon-containing reductant in the amount of 20-40% of mass of wastes and coal tar pyrolysis products at putting-on the counter-flow blast into rotary furnace followed by separation of zinc and entrapping of sublimates at obtaining of zinc oxides. Gaseous fuel is burnt in working space of furnace before ignition of solid reductant and coal tar pyrolysis products.

EFFECT: high intensity of zinc sublimation and iron reduction processes; increased degree of removal of sulfur; increased degree of metallization of finished product.

7 tbl, 1 ex