SU1602878A1 - Method of producing carbon-containing iron ore materials - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used to produce agglomerate and pellets with residual carbon and a reduced content of iron oxide. The goal is to improve the quality of iron ore material. Solid fuel, such as anthracite gum, is treated with organic matter wetting it and a mixture of oxides is applied to the surface, after which it is burned. The calcined fuel is mixed with iron ore material and flux additives, pelletized and subjected to heat treatment. The obtained iron ore material has a low FEO content, a high carbon content with a sufficiently high strength in a cold state and during a reduction-heat treatment. 1 tab.

Description

The invention relates to ferrous metallurgy, namely the preparation of metallurgical raw materials, and can be used to obtain sinter and bulk carbon with residual carbon and low iron oxide content for blast furnace production.

The purpose of the invention is to improve the quality of iron ore material.

 The method is carried out as follows.

Fuel, such as anthracite gum, is treated with fuel oil or other organic matter wetting it. A mixture of oxides is then applied to the wetted surface of the fuel. The resulting granules are roasted. At the same time, the porosity of the created coating. As the sintering of the oxides entering into it decreases sharply, the volatiles represented mainly by the reducing agents (hydrogen and carbon monoxide) are removed. A layer of iron ore material and flocking additives are rolled onto the burned granules. The resulting raw material is subjected to heat treatment.

Example. Anthracite particles of 5-7 mm size were used as fuel in the prototype. A coating consisting of a mixture of slag — a byproduct of pro-; of ferromanganese production (calcium oxide 36.27%, silica oxide 36 70%

magnesium oxide 16.15%), and lime B ratio of 4: 1. Then, a layer of the iron-ore flux mixture was rolled onto a part of the anthracite with a coating, and pellets of diamt-Rum were obtained for 13-15 min.

to oo

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The obtained pellets had the composition: 3.5 parts of anthracite, 5 parts of coating, (4 parts of slag and 1 part), 91.5 parts of iron ore flux mixture,

In accordance with the proposed method, anthracite particles with a particle size of 5–7 mm were also used as fuel. The surface of the fuel particles was also coated with a mixture of shpak and lime in a 4: 1 ratio. The coated fuel particles were heat treated by heating at a rate of 80-100 ° C / min to 1300-1320 ° C and suspended at this temperature. round for 2 min. Heat treatment was carried out in a nitrogen atmosphere. As a result, volatile and moisture were removed.

Thus, the following pellets of the composition were obtained: 2.3 parts of anthracite, 5 parts of coating (4 parts of slag and 1 part of lime), 91.8 parts of iron ore flux mixture.

The firing of both types of njJOHSB pellets was done in an integrated laboratory installation With a bowl with a diameter of 300 mm. The parameters for firing both types of pellets are: drying at a temperature up to 9 minutes, heating at a speed of 80-100 ° C / min to a firing temperature of 1250-1280 s and firing for 4 to 6 minutes, cooling at a speed of 80 OO C / min .

The results of determining the metallurgical properties of both types of pellets are presented in the table. ,

55,7.555,53

-2, 212.79

37.80 -22.40 50

0.70 0.70

.

55

89,3990,51

1,931.90

Table continuation

five

0

five

0

five

0

five

As follows from the data presented in the table, both types of pellets have equal basicity and are very close in total iron content. Both types of pellets have a sufficiently high hot strength (the content in the sample is in the sample, passed in accordance with GOST 19575-84, fractions + 10 mm - 0.5 mm) with a few better indicators in the indicator of B. : The pressure drop in the bed and the shrinkage of the bed of both oakhashey species are also very high in absolute values and are not significantly different.

The effect of pre-heat treatment of anthracite with a coating is twisted in such quality indicators as the content of residual carbon, iron oxide and reduction rates when determined by the methods of Linder and Kobe Steele. The content of residual carbon has increased significantly (from 2.21 to 2.79%). The content of iron oxide decreased significantly (from 37.80 to 22.40%). In accordance with this, the number of hard-to-reduce oxides based on iron oxide decreased, as a result of which the recoverability of B was significantly increased (from 19.5 to 28.32% fio by the Linder method and from 53.5 to 63.2% by the Kobe method). Steele).

The invention makes it possible to obtain a carbonaceous iron ore material, which has a lower content of iron oxide and a higher other 16028786

that is, significantly improve. material on the surface of the particles weeping the finished product. pouring, mixing with iron ore material and fluxing additives, the formula of the invention is forging and heat treatment, which is

A method for producing carbon content — increasing the quality of iron ore magnesia iron ore materials, including material; coated fuel; subjecting the coating to oxide to roasting

Claims (1)

Claim A method of obtaining carbon-containing iron ore materials, including the coating of oxide 1602878 6 materials on the surface of the fuel particles, mixing with iron ore, material and fluxing additives, pelletizing and heat treatment, characterized in that, in order to improve the quality of the iron ore material, the coated fuel is fired.