SU136396A1 - Method for the production of double-layer fluxed iron-coal lumps - Google Patents

Description

There are known methods for producing double-faced iron-coal lumps with a coal core and an ore outer layer.

The peculiarity of the described method is that, in order to obtain high-quality charge for blast-furnace and steel-smelting processes, the core is made from flux-coal mixture, and B the outer layer is injected with iron ore or its concentrate with organic matter NLP.

The proposed method consists in the fact that a finely divided mixture of solid fuels and limestone is crushed in a dish-shaped granulator in the form of small flux-coal lumps. The resulting lumps are transferred to another granulator, where they are rolled BTOpoii layer15 of iron ore or concentrate with the addition of nly without additive; flux, as well as with or without the addition of organic substances.

The resulting double-layer lumps are fed to roasting, carried out in any way, in an aggregate with an inlet, in a shaft pit, iLiii in rotary, chamber, tunnel and ring kilns. Obzhng carried out at a temperature of VET-1300, as a result of which there is a partial reduction of iron.

Some variations are possible in the process of making lumps. For example, lumps from a flux-coal mixture obtained in the first granulator are powdered with finely-chopped limestone in the annular groove of the first granulator. The bilayer lumps obtained in the second granulator are insulated with finely isolated or toluene in the ring section of the second grain core.

The agglomerate of the flux-coal mixture can be produced on belt nli roller presses to produce large cylindrical or teardrop-shaped briquettes. Bilayer lumps can be strengthened by known methods: carbonization, drying, roasting, addition of binding, etc. So, after roasting, lumps can be crushed and thickened.

The resulting double fluxed iron-coal lumps are used; as a charge material for domestic processes and agglomeration and quality of metal in steelmaking.

Subject invention

Claims (2)

1. The production method of double-layer fluxed iron-coal lumps in two granulators or in other pelletizing or pressing units, so that in order to obtain a high-quality charge for the blast furnace and steelmaking process, as well as for agglomeration, the internal core is made of a flux-coal mixture, containing limestone, or marl, or dolomite, or a clay with solid or non-binding additives and solid fuel, and iron ore or its coicentrate with an additive is added to the core layer.or without the addition of flux. 2. A method according to claim 1, characterized in that organic additives are added to the mixture to form the outer layer.