SU405952A1 - SEMI PRODUCT FOR MELTING SYNTHETIC SLAG - Google Patents

Description

one

This invention relates to ferrous metallurgy, in particular to the production of synthetic slags.

A known intermediate for smelting synthetic slag, consisting of gliozem-containing products and calcareous materials, 20-30% of waste from electrocorundum, 12-20% of spent synthetic slag, the rest is known. The disadvantages of the known ooluprodukt are that the resulting semi-product is contaminated with oxides gland. The iron oxide content is 2-10%; The waste products of electrocorundum are used for remelting to electrocorundum, therefore there is practically no waste and they are expensive; the use of limestone increases the specific consumption of electricity in the production of synthetic slag from the intermediate product.

The aim of the invention is to reduce the cost of the lime-clayphozemic intermediate for smelting synthetic slag and improving its quality.

The goal is achieved by introducing magnetic lime-alumina intermediate product (abrasive production material and carbonaceous m-material screenings, coke nalimer, stone or charcoal, pitch, 1Pr slurry; I eat the ratio of components (wt.%):

-70

Aluminous sludge50Magnetic material of abra-10sive production. Screenings of carbon-containing1-5.

(M material, Cyclone dust, lime production, Other Raw materials: alumina slurry with 90-92% ABOz content; 1-2% SiOj; 2-5% FeO, resulting from crushing and grinding of corundum; abrasive magnetic material; 40-60% A12Oz, the rest of the iron alloy containing 4-8% Si, screenings of carbonaceous material and cyclone dust of lime production represent dispersed demand.

The components of the intermediate product in a given ratio are fed to the granulator and pelletized into granules. For binder, water is used in an amount of 10-20% by weight of solid components. After drying, the pellets have the following composition (wt.%): 2.3 57.4 AljOs, 1.51 MgO. 0.013 P, 0.3 S, 8.3 loss np; i calcination. 2.3 FeO; 2.5 metals key.

Carbonaceous material (IKOKC, coal, etc.) in the amount of 1-5 wt. % in the process of melting the intermediate in the electric furnace restores iron oxides. A more complete deposition of reduced iron is achieved by introducing a magnetic material in the amount of 1-10 weight. % Metal inclusions pass through the slag layer, coagulate with small drops of reduced iron, precipitate on the bottom of the furnace, protecting it from destruction. After the metal is spiked, it is soldered. Silicon, "part of the magnetic material of the abrasive production, contributes to the recovery of iron oxide.

To obtain a synthetic slag of a given composition, together with tulle product, lime is melted.

Example. Under industrial conditions on a granulator with a bowl diameter of 1 m with an inclination angle of 45 °, pellets were obtained from charge mixes of the following powder materials (wt.%).

Aluminous slime58.0

Magnetic (abrasive material: production2.0

Coke screenings3.0

Lime production cyclone Else

In order to moisten the mixture, water was supplied to the granulation bowl in an amount of 15% by weight of the solid components.

The obtained pellets were melted in a magnesite lining furnace. The power of the furnace transformer is 2.5 mva.

Melted 2.5 pellets and 0.4 g of lime. The resulting synthetic slag contained (wt.%): 45,03 ABOZ; 1.5 MgO; 50.5 CaO; 2.5 SiOa; 0.8 FeO; 0.013 P, 0.07 S, 0.03 C.

PRED iM e T inventions

Claims (2)

1. A semi-finished product for smelting synthetic slag, consisting of alumina sludge and lime-containing material, characterized in that, in order to improve its quality, magnetic abrasive production material and carbonaceous material screenings are introduced into it in the following ratio of components in% % by weight: .Germanozymic sludge50-70 Magnetic (Material of abrasive production. 1-ilO Screenings of carbonaceous .m material 1-5 Lime-containing material. Rest. 2. A semi-product according to claim 1, characterized in that a lime production dust is introduced as an ied-containing material.