SU901275A1 - Main chute of blast furnace - Google Patents

Description

(54) MAIN BURNING DOMAIN FURNACE

I

The invention relates to ferrous metallurgy, in particular to the domain of manufacture and can be used in the production of products of smelting from a blast furnace.

The closest to the technical C5t proposed (the effectiveness and the effect achieved is a blast furnace chute containing a central channel, a skimmer, passes for pouring iron and slag and a slag pit with a slope of the bottom to the central channel, and the ratio of the bottom slag to the width of the center pipe is not 1: 3 P.

During the production of pig iron and slag from the blast furnace, the bulk of the pig iron passes through the central channel and, settling on its bottom, enters through a skimmer hole and then through the pass into the chute to drain the iron. The slag stream, which is searched over a layer of cast iron in the central channel, is removed into the slag RETURN and further into the chute to drain the tank. The iron droplets deposited in the slag pit along the sloping bottom are returned to the central channel.

A disadvantage of the known main trough is the low degree of extraction of pig iron from slag, which is caused by the insufficient size of the slag surface in the slag pit.

The purpose of the invention is to increase the extraction of pig iron from slag during the production of smelting products from the furnace.

This goal is achieved by the fact that in the main trench of a blast furnace containing a central channel, a skimmer, passes for pouring iron and slag, a slag pool with a slope of the bottom to the central channel while the slag pit is equipped with at least one removable separating plate installed above its bottom. .

FIG. I shows the main gutter, a plan view; in fig. 2 is a section A-A in FIG. one.

To the letke 1 of the blast furnace 2 there is an adjacent lined central channel 3 with a slagging pond 4, a skimmer 5, passes 6 and 7 and gutters 8 and 9 for pouring iron and slag. The slag pit 4 has at least one separator plate 10 mounted above its bottom 11, which can be made removable

The gutter works as follows

Cast iron and slag flow from blast furnace 2 through tap 1 and are separated by specific gravity in the central channel 3 to the skimmer 5. The cast iron leaves through the hole in the lower part of the skimmer and pass 6 into the chute 8 to drain the iron. A slag stream located above the iron layer in the central channel and carrying small droplets of the iron fills the ashtrap 4, separating at least one separating plate 10 into two layers, each of which moves independently through the passes 7 into the chute 9 for draining slag in the tank. In the case of two separation plates, three layers and three streams are formed, in the case of three plates, four layers and streams, etc. The particles of iron settled in each layer of slag along the inclined bottom 11 and the separation plates 10 are returned to the central channel 3.

Separation of slag plates into layers in the slag pit is necessary in order to increase the surface area of the slag in a casting yard at a given area of the slag pit. The larger the area of this surface, the more metal particles have time to settle in the slag at a given speed of its release from the furnace and this speed of sedimentation of parts of the metal.

The application of the proposed main trough allows increasing the metal recovery from the slag in the process of exhausting from the furnace up to at least 90% against 50-70% with the known device.

The expected economic effect for a blast furnace with an annual capacity of 1.3 mln. Tons is 351 thousand rubles.

Claims (1)

1. USSR author's certificate No. 453426, cl. From 21 to 7/14, 1974.