SU556128A1 - Method for processing blast furnace slags - Google Patents

Description

(54) METHOD FOR PROCESSING DOMAIN SLAGS

one

This invention relates to the field of blast furnace slag processing.

The known method 1 for the processing of slags for the purpose of applying them as mineral fertilizers, which is carried out by the joint melting of lime, chrome ore and ferrosilicochrome. As is known, my method introduces ferrosilocalcium in the amount of 1-10% by weight of the melt into the melt, and the cooling of the slag is dried, which is controlled by a special temperature regime.

The disadvantages of this method are the complexity of the process and the high cost of the slag product, which limits the possibility of its production and use as a fertilizer.

There is also known a method of processing slags 2, based on the appearance of calcareous rasiada. According to a known method, limestone is introduced into the slag melt when it is discharged from the furnace and drained into the bowl, which, due to the tenlo content of the slag melt, is burned, and the slag melt, cooled in the bowl, is converted into a paste-sinter specs - mechanical mixture of slag and lime. After unloading from chap1I, siek at 700-800 ° C is irrigated with water, which leads to its disintegration into powder and lumpy material. Of the products

decomposition by known methods can be allocated powder fertilizer, lump. material for road construction.

The disadvantages of this method are its complexity and laboriousness, as well as the instability of the slag disintegration process, which is caused by the steel smelting technology.

The closest to the described invention to the technical essence and the achieved result is a method of processing blast furnace slag, including layering of slag melt in a trench cooled by the newly formed surface of the layer with water, the development and crushing of slag with

o-1 mm fraction, for example by pneumogas, which can be used as a lime fertilizer 3 without additional grinding. The disadvantages of this known method are

the long cooling time of the slag cake and the welding of slag with similar chemical composition, which complicates and slows down the development of transport. The aim of the invention is to intensify the process of blast furnace slag processing in order to use the obtained product in the quality of mineral lime fertilizer and building material.

For this purpose, a method of blast furnace slag processing is proposed, consisting in the layering of slag in a trench, cooling of the newly formed surface of the layer with water, development and crushing of slag.

A distinctive feature of the proposed method is that a layer of titanium blast furnace slag with a content of 5-18% TiOs is fed to the I-3 layer of blast furnace slag. Slag, both ordinary and titanium, is fed into the trench in the form of a mixture of pre-cooled lumps and melt at a ratio of solid and liquid phases by weight 4-9:.

Example. 1-3 layers of ordinary slag of foundry or pig iron are launched into the trench. The slag is fed into the trench either as a melt or as a mixture of hardened pieces and melt at a ratio of solid and liquid phases (4 + 9): 1. For 1-3 layers of slag of ordinary casting or pig iron, there is a layer of titanium blast furnace slag containing 5- 18% TiO2. The supply of titanium blast furnace slag is carried out either in the form of a melt or in the form of a mixture of solid and liquid slag at a ratio of 4-9: 1. In this sequence, the entire trench is filled.

After filling up, the trench is developed, crushed stone is crushed and a fraction of O-1 mm, suitable without additional grinding as a lime fertilizer, is separated and sent to agriculture. The fraction of 1-5 mm after additional grinding is also used in agriculture as a lime fertilizer. The fraction of more than 5 mm or grind to fertilizer, or used as crushed stone in construction.

The invention makes it possible to intensify the processing of blast furnace slag by 15–20%, which is associated with faster mass cooling and faster trenching. In addition, the powder fraction O-1 mm can be used as a lime fertilizer to neutralize acidic soils and plant nutrition with calcium, magnesium

and trace elements. For example, when adding slag powder in the amount of 4.7 tons per 1 hectare of crops on acidic soil, the yield increase of potatoes is il8 c per 1 hectare.

Material fraction O-5, 5-20 and 20-40 mm can be used as aggregate concrete: Fr. O-5 mm - as sand, and larger fractions - as a large aggregate. For example, at a consumption of 1 m of concrete mix of ingredients in the following quantities, kg: cement grade 300- S, slag sand fr. 0-5 mm - 730, crushed stone fr. 5-20 mm - 475, crushed stone fr. 20-40 mm - 505, water -196 l, 10% water

sulfite alcohol stillage solution - 4.5 l. Get concrete with a compressive strength of 183 kg / cm

Claims (3)

Invention Formula A method for processing blast-furnace slags, including layering slag in a trench, cooling the newly formed surface of the layer with water, developing and crushing slag, differing in that, in order to intensify the process and use the resulting product as a mineral lime fertilizer and building material, 1-3 layer blast furnace slag serves a layer of titanium blast furnace slag with a content of 5-18% TiOj. 2. A method according to claim 1, characterized in that the slag is ordinary and titanium, is fed to the trench in the form of a mixture of precooled pieces and melt at a ratio of solid and liquid phases by weight 4-9: 1. Sources of information taken into account in the examination: I. Auth. St. No. 376345, cl. From 05D 3/04, 25.05.71. 2. A.S. Fefer, “New technology for the processing of open-hearth slags for metal, fertilizer and ground products, Chel Binsk, regional book publishing house, p. 48-49. 3.A. Gut.man "The use of blast furnace slags, 1936 (prototype).