RU2347002C2 - Method of producing alloy - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to ferrous metallurgy, particularly to method of producing alloy for refining of steel. The method consists in galvanic coating of protective aluminium cover on the surface of solid particles of ferrovanadium in amino-ether electrolyte at current density from 0.3 to 15 A/m² and electrolyte temperature of 20-40°C with successive holding of ferrovanadium particles on cathode from 10 to 210 s till formation of aluminium coating of 5-40 mcm thickness. The method facilitates producing thin aluminium containing layer and using ferroalloy for alloying steel with limited contents of aluminium.

EFFECT: producing thin aluminium containing layer and using ferroalloy for alloying steel with limited contents of aluminium.

Description

The invention relates to the field of ferrous metallurgy, in particular to a method for producing a ligature for steel refining.

A known method of producing a ligature, comprising introducing solid particles into the melt and obtaining a coating on solid particles. In this method, granular magnesium is introduced into the molten stream of a silicon-containing ferroalloy / 1 /.

The closest is a method of obtaining a ligature, including the introduction of solid particles of ferrovanadium into a molten aluminum or aluminum-containing material, where the coating process is carried out at 820-950 ° C with a shutter speed of 60-240 s to form a film with a thickness of 0.37-1.104 mm / 2 /.

This method is intended to obtain a coating of aluminum on ferrovanadium particles and to create a dense and durable coating of aluminum or aluminum-containing material on ferrovanadium, to obtain local zones during alloying, deoxidation and refining of vanadium-containing steels.

However, ferrovanadium in the protective shell obtained by this method, due to the large film thickness and, consequently, the large mass of introduced aluminum into the melt, cannot be used for alloying steels in which the aluminum content is limited. The objective of the invention is to obtain a thin layer of aluminum on the surface of the particles of ferrovanadium.

The problem is achieved in that the protective coating is applied galvanically to the surface of the ferrovanadium. The galvanic deposition of aluminum coating is carried out in an amino ether electrolyte, where the coating process is carried out at a current density of 0.3 to 15 A / m ² and an electrolyte temperature of 20-40 ° C with exposure of ferrovanadium particles to the cathode from 10 to 210 s to form an aluminum coating 5-40 microns thick. Anodes are aluminum. It is obvious that dissolution of a coating of this thickness in a liquid metal has practically no effect on the aluminum content in steel.

The determination of the exposure time is explained in the following example. For example, when the exposure time is less than 10 s, spotting of the resulting coating is observed and the coating thickness is less than 5 microns. When the exposure time is more than 210 s in the above range of temperatures and current density, the coating thickness is 40 μm. A further increase in the exposure time will lead to an increase in the coating thickness (over 40 μm), which increases the excess Al content in the steel upon alloying with ferrovanadium.

The temperature range is explained in the following example. At temperatures below 20 ° C, at a current density of 0.3 to 15 A / m ^{2, the} electrolyte has a low cathodic polarization and, accordingly, the process is characterized by a low speed. At temperatures above 40 ° C, at a current density of 0.3 to 15 A / m ^2, the deposition rate becomes constant and a further increase in temperature does not increase the deposition rate.

This method of obtaining the ligature is as follows:

- the application of aluminum coatings on ferrovanadium is carried out at the cathode in a plating bath;

- solid particles of ferrovanadium are immersed in an electrolyte of the following chemical composition (in molar fractions): AlCl ₃ (0.36-0.38), N-butylamine (0.12-0.17), Diethyl ether (0.5-0, 52) at a temperature of 20-40 ° C, - and can withstand 10-210 s.

The result is a dense and durable coating with a thickness of 5-40 microns.

In the smelting of vanadium-containing steels, ferrovanadium with a protective coating of aluminum was used as a ligature, which made it possible to increase the degree of assimilation of vanadium in steel by 8% compared to conventional ferrovanadium.

The use of aluminum-coated ferrovanadium particles provides the creation of artificial local zones in which favorable conditions are created for the alloying and deoxidation process, which makes it possible to stably obtain higher vanadium content in steel and reduce the consumption of ferrovanadium.

Information sources

1. RF patent №2058416, cl. C22C 35/00, 04/20/96.

2. RF patent No. 2202646, cl. C22C 35/00, 02/15/2002.

Claims (1)

A method of producing a ferrovanadium-based ligature, comprising applying a protective aluminum coating to the surface of ferrovanadium solid particles, characterized in that the coating is carried out in an amino ester electrolyte at a current density of 0.3 to 15 A / m ² and an electrolyte temperature of 20-40 ° C with exposure of ferrovanadium particles at the cathode from 10 to 210 s to form an aluminum coating with a thickness of 5-40 microns.