SU1560553A1 - Method of washing blast furnace in smelting vanadium cast iron from titanium-magnetite materials - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used in the production of vanadium iron using titanium-magnetite materials. The aim of the invention is to increase the productivity of the furnace and improve the quality of the product by maintaining the concentration of vanadium in the iron at a predetermined level by increasing the efficiency of washing the hearth. The essence of the invention consists in using, in addition to the usual washing materials of welding slag, iron concentrates (vanadium-containing carbonaceous shale in a ratio of 1: (1.5-2.5) in the amount of 20-50 kg / ton, introduced periodically every 70-120 outlets within 15-30 feeds while improving the heat state of the furnace. Using the invention allowed to increase productivity, reduce coke consumption and avoid deterioration of the quality of cast iron when washing the furnace. 1 Cpf-ly, 1 tab.

Description

The invention relates to ferrous metallurgy, specifically to the production of vanadium iron in blast furnaces using titanium magnetite materials in the iron-containing part.

The aim of the invention is to increase the productivity of the furnace and improve the quality of the product by maintaining the concentration of vanadium in the iron at a given level. For this purpose, every 70–120 releases, for 15–30 innings, high-iron iron ore materials and vanadium-containing coal-shale are introduced as a mixture in the ratio

/ 1: (1.5-2.5) in the amount of 25-50 kg / t of pig iron, while simultaneously increasing the thermal state of the furnace.

The table presents the results of industrial testing method. As a base period, the daily average data of the furnace operation by the known and proposed methods are taken.

Additive to high oxidized iron ore materials (welding slag, about iron concentrates) vanadium-containing carbonaceous slate / (BUX) composition, wt.% Si0765, l; CaO 3.8; MgO 1.7; A1gOz 2.4; VЈg 0.92;

Fe

oSuj

3.7; S 1.0; From 9.8 - provide a

but

I was eating a wasp

If the proposed wash ratios are observed, maintaining the optimum operating mode of the furnace eliminates the negative consequences of washing: an increase in coke consumption, a decrease in furnace productivity, a decrease in the concentration of vanadium in the iron.

As follows from the above data, the maximum interwash period should be no more than 120 outlets, since exceeding this period does not increase the efficiency of washing the mining furnace, i.e. its productivity and coke consumption remain at the same flushing level (series 8). The lower limit (70 outlets) is set from the conditions of the most rational carrying out of additional technological operations, as well as reducing the number of washes, in the period of which an increase in sulfur in the iron is observed. The number of flush feeds is determined by the total volume of the material being planted.

The choice of the ratio of iron-containing additive VUKS in the range of 1.5-2.5 is determined by the need to maintain about

five

0

five

simultaneous increase in the concentration of sulfur.

Example. Long-term tests were carried out on blast furnace No. 5 with a volume of 1719 m3 on the use of vanadium-containing carbon-shale shale (VUKS) for washing the furnace and coke oven nozzle. A total of 8 test series (see table).

With an unchanged composition of the iron ore portion of the charge, 11.3-42.9 kg / ton of VUKS and 8.7-N, 7 kg / ton of welding slag and / or iron concentrates were introduced at their mass ratios (3.5-2.5) :. The results of the operation of the furnace were compared with the average daily indicators when washing with high-toxic iron-containing components of the charge.

The use of the invention allows to increase the productivity of the furnace, to reduce the consumption of coke while maintaining the quality of the produced iron.

Claims (2)

Invention Formula 1, The method of washing the hearth of a blast furnace in the smelting of vanadium iron vanadium content in iron ore-3Q from titanium-magnetite materials, including the charge in the flushing period at the usual level. When the ratio of these components is less than 1.5 (series 1), there is no rational content of vanadium in the iron, an increase in the upper limit of more than 2.5 reduces the washing efficiency and performance of the furnace. The optimal amount of flushing additive in the feed is 25-50 kg / t of pig iron. Reducing the amount of additive below the specified lower limit reduces the effectiveness of washing (series 5), and exceeding the top (series 4) reduces the number of feeds and, accordingly, increases sulfur content in cast iron. The need to increase the thermal state of the furnace by about 40-70 ° C has been established, since otherwise a decrease in the content of silicon, titanium and vanadium in cast iron with 35 40 45 50  loading of mineral raw materials, coke, fluxes, supply of combined blowing, production of cast iron and slag, input of washing materials, characterized in that, in order to increase furnace productivity and increase product quality by keeping the vanadium concentration in the cast iron at a given level, flushing materials are introduced into the form of a mixture containing oxides of iron and vanadium-containing carbon-silicon shales in the ratio of 1: (1.5-2.5), respectively, in an amount of 25-50 kg / ton of pig iron in the flow while increasing the thermal state echi. 2. Method pop.1, characterized by the fact that flushing materials are introduced every 70–120 outlets over the next 15–30 feeds. five 0 five 0  loading of mineral raw materials, coke, fluxes, supply of combined blowing, production of cast iron and slag, input of washing materials, characterized in that, in order to increase furnace productivity and increase product quality by maintaining the concentration of vanadium in cast iron at a given level, washing materials are introduced in the form of a mixture containing oxides of iron and vanadium-containing carbon-silica shale in a ratio of 1: (1.5-2.5), respectively, in an amount of 25-50 kg / t of pig iron in the flow while increasing the thermal state of fucking 2. Method pop.1, characterized by the fact that flushing materials are introduced every 70–120 outlets over the next 15–30 feeds.