SU1323577A1 - Method of discharging ferroalloys from furnace - Google Patents

Abstract

This invention relates to the field of metallurgy, specifically to the production of ferroalloys. The purpose of the invention is to accelerate the separation of slag and ferroalloy and reduce the loss of ferroalloy with slag. With the release of smelting products from the furnace, the slag is filtered in a ladle from bottom to top through a layer of ferroalloy with a thickness equal to (0.4-1.0) at a / UV where y and y are the density of the ptac and ferroalloy, respectively. When the crushed shpak splinters emerge from the ferroalloy, practically during the casting phase, good phase separation occurs with a simultaneous increase by a factor of 2-3 in the extraction of the ferroalloy core from the waste slag compared to the known method. 2 ill., 1 tab. (L

Description

The invention relates to ferrous metallurgy, specifically to the production of ferroalloys, and can be used in the production of slag-metal melts in non-ferrous metallurgy.

The purpose of the invention is to accelerate the separation of metal and slag and reduce the loss of metal with slag.

The method according to the invention consists in the fact that the slag, when discharged from the furnace, is filtered from the bottom upwards through a ferroalloy layer with a thickness equal to (0.4-1.0) y / jr, where y and the density of the slag and ferroalloy, respectively.

It has been established experimentally that the larger the ratio y, the more intense the separation of metallic inclusions from slag and the smaller the thickness of the metal layer is required for this. At low y / T values, the gravitational separation goes slower: but the filtration time and the degree of dispersion of the jet of pshak in the bulk of the metal increase.

Figure 1 and 2 shows the scheme of implementation of the method.

After cutting the furnace outlet, the metal along chute 1 (Fig. 1) is poured into a lined bucket 2. The discharge is effected through a hollow through container 3, which is, for example, a thick-walled metal pipe. After all the metal is released into the ladle, the slag begins to flow onto its surface bounded by the inner circle of the pipe partially immersed in the metal. Slag as the column height increases, displaces the metal from the pipe until the hydrostatic pressure of the slag inside the pipe and the dynamic pressure of the jet from the trough are not balanced by the pressure of the metal melt column from the lower edge of the pipe to its surface in the ladle. The further release of slag from the furnace is accompanied by passing it through the lower edge of the pipe and by a vertical rise to the metal surface. When the surface of the pshakov melt reaches the level of the drain bucket (Fig.2), slag overflows into the bowl 4. The height of the slag column 5 inside the pipe depends on the depth of the pipe in the ferroalloy and the density difference between the ferroalloy and slag ;,

When slag is raised, its jet is dispersed, which means 235772

It increases the surface of dynamic contact of slag and ferroalloy. Ferroalloy drops, previously concentrated in the slag, interact

5 with a mass of metallic melt and assimilated by it. This process is more effective, the greater the difference in the densities of the ferroalloy and its slag, since the force of gravity contributes

0 admission droplets of ferroalloy to the interface. As a result, the filtered slag 6, placed on the surface of the ferroalloy, is significantly freed from entangling ferroalloy drops within 5 s.

The separation of ferroalloy and slag according to the proposed method proceeds simultaneously with the release of smelting and ends upon its completion, i.e. A high separation intensification is achieved.

The layer of ferroalloy through which the slag is filtered is equal to 0.4-1.0 ratios of the densities of the slag and metaplastic melts, which in the analytical form is written as H (0.4-1.0) x and UV (m), where H - thickness ferroalloy (F), ush / uv ratio of densities of liquid slag and ferrospla30 va. This empirically found dependence can be transformed as H y

The table shows the test results of the proposed method for you, f smelting ferrosilocalcium and co-manganese ferrosilicate. A guaranteed reduction in the content of crusts in waste slag less than / V 4.2% is achieved at H 0.4z shd / s. Depth H 1.0 y, (v) it is not feasible to differently, since the growth of the extraction of the slag from the slag ceases, the number of slag droplets entangling in the ferroalloy increases, technical and operational difficulties arise in the implementation of the method.

With the known joint discharge of ferro silicocalcium and ferrosilicomanganese ferroalloy with waste slag, they are 6.6 and 9.24%, respectively.

- The application of the proposed method allows reducing them by 2-3 times.

Claims (1)

Invention Formula The method of release of ferroalloys from the logs, including the release of ferroalloys and slag into the ladle, holding up to their separation and discharge of slag into the bowl, characterized in that, for the purpose of acceleration the separation of ferroalloy and slag of ferroalloy with a thickness equal to (0.4 and reducing the loss of ferroalloy from slag-) ui (/ g, ush, slag, slag when released from the furnace, the filtering of slag and ferroalloy correspond upward through the ladle venous layer. FI.1 Editor M. Nedoluzhenko fJu & .2 Compiled by T. Morozova Tehred I. Popovich Order 2933/30 Circulation 549Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5 Production and printing company, Uzhgorod, Projecto st., 4 Corrector I. Muska