US 2011/0030507 A1 · PROCESS AND APPARATUS FOR PRODUCING LIQUID PIG IRON OR LIQUID PRIMARY STEEL PRODUCTS

Abstract

A process and an apparatus for producing liquid pig iron or liquid primary steel products from charge materials formed by iron ores and additions. The charge materials are subjected to a further reduction in a reducing zone (1) and are then fed to a smelting zone or a smelting unit (2), in particular a fusion gasifier, for smelting with the addition of carbon carriers and oxygen-containing gas to form a fixed bed. A CO- and H2-containing reduction gas is formed, which gas is introduced into the reducing zone converted there and drawn off as top gas. The hot top gas, laden with solid matter, after separation of the solids, is subjected at least to a dry coarse separation and at least parts of the hot solids segregated by the separation are returned into the smelting zone or the smelting unit (2) or the reducing unit (1). In addition, the top gas is treated in a further fine separation stage (13A).

Claims32

Dependent claims

A process for producing liquid pig iron or liquid primary steel products from charge materials formed by iron ores and additions, the process comprising:

subjecting the charge materials to a reduction in a reducing zone and then feeding the charge materials to a smelting zone for smelting along with adding carbon carriers and oxygen-containing gas to form a fixed bed and for forming a CO- and H2-containing reduction gas;
introducing the reduction gas into the reducing zone, for there converting the reduction gas and drawing the converted gas off as hot top gas;
subjecting the hot top gas, laden with solid matter, at least to a dry dust separation, for at least partially separating the solids from the top gas, returning at least parts of the separated hot solids into the smelting zone or into the reducing zone,
after the dry dust separation, subjecting the top gas at least to an additional fine separation stage for at least partially separating the solids remaining in the top gas, and returning the solid matter separated in the fine separation stage into the smelting zone.

1 more element

An apparatus for producing liquid pig iron or liquid primary steel products, comprising,

a reducing unit configured for reducing charge materials formed by iron ores and additives:
a smelting unit configured for smelting the reduced charge materials with the addition of carbon carriers and oxygen-containing gas, for forming a fixed bed and a CO- and H2-containing reducing gas;
wherein
a reducing gas line connecting the smelting unit to the reducing unit, and the reducing gas line is configured for introducing the reducing gas formed in the smelting unit into the reducing unit:
a drawing-off line configured for drawing off the reducing gas converted in the reducing unit as hot top gas laden with solid matter,
at least one separation device configured for dry dust separation of the solids of the top gas, the separation device has a gas drawing-off line for removing the coarsely cleaned top gas and has a feed line which connects the separation device to the smelting unit such that the still hot separated solid matter can be introduced directly into the smelting unit the device for dry dust separation is connected by one-of a first gas drawing-off line or a second gas drawing-off line to at least one device configured for fine separation of solids a further feed line which connects the fine separation device to the smelting unit.

3 more elements

Dependencies are inferred from the claim text.

Process and apparatus for producing liquid pig iron or liquid primary steel products

Life of this patent

Process and apparatus for producing liquid pig iron or liquid primary steel products

Life of this patent

Abstract

Claims32