UA47550U - METHOD for PROCESSING molten slag - Google Patents

Abstract

A method for processing molten slag, according to which the slag is poured at the receiving forms of the filling machine for cast iron pouring, at that before the slag discharge they are sprayed with the limewash from the sprayer of the filling machine, and further cooling and thermal fragmentation are carried out by sparging of the receiving forms with a slag by water, which comes from shower facilities of the filling machine, located over the conveyor with receiving forms, after which the dispersed slag is discharged in the receiving container.

Description

At the same time, the output of small fractions increases by 2-3 times, and the extraction of metal from slag increases by 1.5 times. In addition, the temperature of the receiving forms decreases, i.e., the difference in heat capacities of the slag layer and the forms increases during the subsequent filling of the forms with slag, which also contributes to the effect of thermal crushing.

Additional cooling of the crushed slag by irrigation with water from one or more cooling devices located on the discharge side of the bottling machine ensures a further reduction in the temperature of the crushed slag to a temperature at which further transportation of the slag by a conventional vehicle becomes possible.

The method of processing slag melt is implemented using a pouring machine for pouring cast iron into receiving molds, which is schematically shown in Fig. 1 and Fig. 2.

Casting machine for pouring cast iron is a belt-type conveyor on which the receiving forms for liquid cast iron are fixed. Figure 1 shows a two-belt filling machine, the components of which are a conveyor 1 consisting of two belts with receiving forms 2 attached to them for receiving molten slag. The filling machine is equipped with a pouring chute 3, a device 4 for preparing a lime solution, which is connected to one or more sprinklers 5 of receiving molds installed under the lower branch of the conveyor 1, and an unloading device 6. In the unloading part of the machine (over 2/3 of the length of the belt), shower units are installed 7, with the help of which the receiving forms with molten slag are intensively watered with water. In addition, in the city of unloading slag from the receiving forms 2 of the bottling machine into the receiving container 9, one or more cooling devices 8 for additional cooling are installed.

The method of processing slag melt is implemented as follows.

The molten slag from the electric furnace (or from the slag bucket) (not shown in Fig. 1 and Fig. 2) is poured into the pouring chute 3, which directs the slag stream through two outlets into the receiving forms 2, which move along two conveyor belts 1 of the bottling machine . When the slag is in contact with the receiving forms and with the environment, primary cooling of the slag occurs with the formation of a hard crust on its surface, which prevents the release of 50".

Approximately from the second third of the way, the receiving forms 2 with molten slag are intensively cooled by water coming from the shower units 7 located above the conveyor belts 1 of the bottling machine.

Intensive cooling by water irrigation of the receiving forms 2 with slag ensures a high rate of cooling of the slag and leads to the occurrence of thermal shock stress in the slag monolith, the appearance of microcracks, and the appearance of the effect of its thermal destruction (cracking of the slag). At the same time, the metal, which is in the form of beads and scraps, is relatively easily released.

In the unloading part of the conveyor 1 of the bottling machine, the receiving molds 2 are overturned, and the hardened slag in the form of a plate falls out of them under the influence of gravity, falling into the chute of the unloading device. The latter directs pieces of slag into the receiving container 9, from where the slag crushed stone enters the warehouse of finished products and is shipped to consumers. At the point of discharge of slag from the conveyor 1 into the receiving container 9, a cooling device 8 is installed for the final cooling of the slag crushed stone.

Empty receiving forms 2 in an overturned position together with the lower branch of the continuous conveyor 1 of the bottling machine move to the filling end of the conveyor 1. With the help of sprayers 5 installed under the continuous conveyor and connected to the device 4 for preparing a lime solution, the inner working surface of the receiving form 2 is covered with lime solution Due to the high temperature of the receiving form 2, water evaporates quickly, and a thin layer of lime remains on its working surface, which prevents slag from sticking to the receiving forms.

The receiving molds treated with a lime solution enter the pouring chute 3, and the cycle of their operation is repeated until the slag is completely drained.

Thus, the method of processing slag melt using a pouring machine for pouring cast iron into receiving molds ensures an increase in the cooling rate of the slag and the appearance of the effect of its thermal crushing, and also leads to a decrease in the intensity of the formation of sulfur compounds and, accordingly, a decrease in harmful emissions into the atmosphere. I am 6 years old and I keep pigs in the yard

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Fig. 1

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