SU87190A1 - Method of making low-protoxidic agglomerate - Google Patents

Description

This invention relates to the field of sharpening iron ores for smelting in blast and open-hearth furnaces by agglomerating small ores and a hot plate.

When an atomomerat is used in blast furnace and open-hearth smelting, its metallurgical properties, mechanical strength, porosity and iron oxide content are especially important.

The mechanical strength of an agglomerate, ps, which is studied in the usual way — by sintering with coke, is directly dependent on the content of iron oxide in it. It is believed that satisfactory strength is agglomerate, containing not less than 17% ferrous oxide. In fact, in order to obtain a sufficient yield of a suitable sinter, the sintering plants produce an agglomerate with an iron oxide content of 22 to 30%.

Although the agglomerate is povipinom content of ferrous oxide and has good mechanical strength, but it is less porous and harder to restore. The more difficult reducibility of sinter in a blast furnace is caused by an increase in the proportion of direct reduction of iron and may lead to an increase in the relative fuel consumption if it is impossible to appropriately increase the heat to blow.

It is possible to obtain a fine-grained agglomerate with low ferrous oxide retention only when the consumption of coxnack is lowered. But with an insufficient amount of heat, the output of the agglomerate is small and the mechanical strength of its nieck is obtained.

The essence of the proposed method consists in applying to the production of the agglomerate of gas agglomeration method, based on the combustion, of gas in the layer of agglomerated ore. During agglomeration of ore, this method allows to create conditions that exclude the reduction of iron oxides in surplus quantities, due to the combustion of gas with theoretically necessary amount of air, at the same time

3871904

that there is a sufficient fusion of 11.2-16.5% for dropping. and 18-P: 4%

particles of the whole mass followed by abrasion,

cooling during cooling.,.

Claims (1)

„..Form Formula During gas agglomeration, high temperatures in the sintered layer are supported by a method of producing low-temperature a longer time than with an ordinary agglomerate by means of a gas agglomeration method with a k (zhom. you-ni, characterized in that the agglomerate stroke is 8-82.5%, the sintering process is carried out theoretically The mechanical strength of the agglomerate is equally necessary air ().