CS256462B1 - High load charge - Google Patents

Abstract

In the composition of a high-peony charge, where the use of a piece valence can be excluded when passing iron ore pellets, the content of iron ore pellets and agglomerate is given by the relationship where P denotes iron ore pellets in /o mass. A 1 - high-peony agglomerate with basicity A 2 - high-peony agglomerate with basicity [1» Λ2 and ko 56 0, „ A 1 that p2 « A 2 p2 constants, where kj =» 1.8 to 2.5 5 to 0.7, while the condition is equal to 2.5 to 3.1 times

Description

The invention solves the composition of the blast furnace charge, in which the use of lump limestone in

In the iron ore portion of the blast furnace charge formed by pellets, lump limestone is used as part of the Etruscan ingredients, as high alkalinity is required due to the relatively low basicity of 0.5 to 0.6 iron ore pellets. Another basic component in the blast furnace charge is steelworks slag, but its passage is limited by the phosphorus contained therein. The last basic component of the charge is a blast furnace agglomerate; mineralogical analyzes of various types of agglomerates show the causes of laboratory findings of operational observations in decreasing strength of agglomerates with alkalinity in the range of 1.2 to 1.8. Therefore, an agglomerate of lower basicity and satisfactory mechanical properties is supplemented with an increased amount of lump limestone and said Martin slag so that the resulting basic basicity slightly exceeds 1.0. However, the limestone passage always represents an increased demand for the flammable component, coke, and the approximate relationship is that 100 kg of limestone requires about 10 kg of coke.

This deficiency is eliminated by a blast furnace batch containing coke, double basic agglomerate, iron ore pellets and steel slag, which according to the invention has a content of pellets and agglomerates according ^to 1 ^A 1 ^{+ to} 2 ^A 2 «--- where

0.09 to 0.25 μ

P - content of iron ore pellets in% by weight Aj - content of blast furnace agglomerates in% by weight with a basicity greater than 1.8; A 2 - content of blast furnace agglomerates in% by weight with a basicity equal to not more than 0,7 a and _g are 2 256 462 stanta, where k ^ a 1,8 to 2,5 and kg · 0,5 to 0,7, pg is equal to 2.5 to 3.1 times Pg ^ ^P.

The empirical dependence established according to the invention allows the use of a double base agglomerate, low and high, at values where both components still have satisfactory mechanical values within the indicated range and together with coke and a limiting amount of Martin Etruscan without the need to add lump limestone, which worsens the energy balance of the reduction process in the furnace.

Practical application to the composition of the blast furnace charge in% is given by two examples »

Example 1 Coke 5.0 A 1 9.0 A 2 6.0 P 3.0 Sm-limestone

Claims (1)

Blast furnace charge containing coke, double basic agglomerate, iron ore pellets and steel slag, characterized in that the content of iron ore pellets and agglomerate is given by P 0.09 to 0.25 where denotes P - iron ore pellets in% by weight, A 1 - blast furnace agglomerate with basicity p ₂ > 1,8% by weight · A 2 - blast furnace agglomerate with basicity pg ^A 0,7% by weight, k ^, kg - constants where kj = 1,8 to 2 , 5 and kg = 0.5 to 0.7, provided that p ₅ * ¹ equals 2.5 to 3.1 times _n A 2 * ^p 2 Printed by Moravian printing works, center. 11 100, the class of People's Militia 3, Olomouc