Blast furnace


The raw materials used in blast furnace smelting are mainly composed of iron ore, fuel (coke) and flux (limestone).
Usually, smelting 1 ton of pig iron requires 1.5-2.0 tons of iron ore, 0.4-0.6 tons of coke, 0.2-0.4 tons of flux, a total of 2-3 tons of raw materials. In order to ensure the continuity of blast furnace production, a sufficient quantity of raw materials is required.


Modern blast furnaces can also use the high pressure on the top of the furnace to generate electricity from some of the exported gas.


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Product introduction

The blast furnace is made of steel plate as the shell, and the shell is lined with firebrick. The blast furnace body is divided into five parts from top to bottom: throat, body, waist, belly and cylinder. Due to the advantages of good technical and economic indicators, simple process, large production capacity, high labor production efficiency and low energy consumption, the iron produced by this method accounts for the vast majority of the world’s total iron output.

The loading of blast furnace is the most important part in the iron-making blast furnace system. Timely and accurate batching and loading is the premise to ensure the production and product quality of blast furnace.

Working Principle

In blast furnace production, iron ore, coke and slag flux (limestone) are loaded from the top of the furnace, and preheated air is blown in from the tuyere located in the lower part of the furnace along the furnace.

At high temperatures, the carbon in coke (some blast furnaces also blow auxiliary fuels such as pulverized coal, heavy oil, natural gas, etc.) and the carbon monoxide and hydrogen generated by oxygen combustion into the air are removed from the oxygen in the iron ore during the rising process in the furnace, thus reducing the iron.

The molten iron is discharged from the iron mouth. The unreduced impurities in iron ore combine with the flux such as limestone to form slag, which is discharged from the slag mouth.

The resulting gas is discharged from the top of the furnace, and after dust removal, it is used as fuel for hot blast furnaces, reheating furnaces, coke ovens, boilers, etc. The main products of blast furnace smelting are pig iron, as well as by-products of blast furnace slag and blast furnace gas.

Technical Parameters

SpecificationBlast furnace height (m)Cylinder diameter (m)Ore demand (t/d)Coke demand (t/d)Use teaching
Capacity(t)Installed powerFloor space (h)
35m³212.25168703.0105( kw)0.5

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