SU1673624A1 - Mixture for melting alloying additives with rare-earth metals - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to mixtures for smelting master alloys, and can be used in smelting master alloys and ferroalloys. The purpose of the invention is to increase the recovery rate of rare earth metals and reduce costs. The proposed mixture contains oxides of rare-earth metals, aluminum-containing and silica-containing materials and fluxes. Iron containing screenings from the production of secondary aluminum alloys were used as aluminum-containing materials, granulated slag from silicomanganese production was used as silica-containing materials, limestone quarry production waste was used as a flux in the following ratio, wt.%: Oxides of rare-earth metals 20-30 secondary aluminum alloys 30-40; granulated slag of silico-manganese production 20-30; limestone mining waste 10-20. Table 3.

Description

This invention relates to ferrous metallurgy, in particular, to master alloys, and can be used in the smelting of master alloys and ferroalloys.

The purpose of the invention is to increase the degree of extraction of rare-earth materials and reduce the cost of the resulting alloy.

The proposed mixture includes oxides of rare-earth metals, aluminum-containing and silica-containing materials and fluxes; iron-containing screenings for the production of secondary aluminum alloys are used as aluminum-containing materials. as a silicon-containing material, granulated slag from the production of silico-manganese and as a flux - mining waste from a lime pit in the following ratio of components, May%

Oxides of rare-earth metals20-30 Iron-containing screenings for the production of secondary aluminum alloys 30-40 Granulated slag for the production of Gangi sigikomar 20-30

ABOUT

4 CJ O GO

Ogkhod mining limestone quarry10-20 There were prepared 5 variants of the compositions of the proposed mixture and 3 variants of the known mixture.

The chemical composition of the proposed and known materials used in the mixture for producing an alloy is given in Table 1.

The composition of the mixtures are given in table 2. All proposed materials are used without special training and are taken as they come from the relevant industries.

The grain size of granulated slag of silico-manganese is 0–20 mm, the limestone quarry waste is 0–3 mm.

The materials are fed to a dosing mixer for mixing for 3-4 minutes. The mixed mixture from the mixer is overloaded into a hopper, from which it is then poured into a crucible of an induction furnace with a capacity of 270 kg, which is heated to 1000-1100 ° C. After the mixture is loaded into the crucible, the melting process starts in 3-5 minutes.

Melting proceeds smoothly without emissions with a strong flame. During smelting, separation occurs: in the lower layer of the crucible, a layer of metal is formed, in the upper layer, slag, which protects the metal from oxidation by atmospheric air. Duration of melting is 20-25 minutes.

After the melting is completed, the alloy and crucible slag are poured into cast-iron molds without lining. After cooling, the molds are inverted, the ingot is easily separated from the walls.

The slag layer on the top of the ingot is separated from the metal without additional machining.

The chemical composition of the ligatures are given in table.3.

The alloy from the proposed mixture does not crumble in air and has a clean surface.

REM extraction is increased to 92% due to the fact that manganese oxides are in the mixture.

As can be seen from Table 3, the resulting ligature from the proposed mixture contains 24.1– 34.1% REM and 20.1–26.6% AI.

The proposed composition of the mixture makes it possible to obtain a ligature at lower material and energy consumption, on the basis of ferrous alloys production and secondary aluminum,

Claims (1)

Invention Formula A mixture for smelting rare earth metals containing rare earth metal oxides, aluminum-containing and silicon-containing materials and fluxes, characterized in that, in order to increase the degree of rare-earth metals recovery and lower cost, it contains iron-containing production residues secondary aluminum alloys, as a silicon-containing material - granulated slag of silicomanganese production, and as a flux - waste of limestone mining career in the following ratio, wt.%: Oxides of rare-earth metals20-30 Iron screening secondary production aluminum alloys 30-40 Slag of production of silicone-merganz-a20-30 Limestone mining waste career10 20 Blend components Hnmgesksh: composition cl s 40-47 15-17 10-11 40-47 15-17 10-11 0.65 50-55 5.6 0.35 1.9 1.2 0.26 15 50.0 13.0 0.60 54.0 3.0 0.62 15.0 - 0.003 0.5 0.57 0.067 7.5 1.38 about -vj from the next Kj .with 85-95 2-15 40-60 -35-55 53.20 0.80 0.02 0.35 40 35 30 We offer a mixture 3010 2515 20 20 Mix prototype The average chemical composition of the master alloy We offer a mixture 33.020.1 6.120.6 4.62.1 Ost- 87.0. 72.0 33.426.0 6.023.0 5.51.5 - -8975.6 34.124.4 4.619.0 5.62.4 9268.6 The mixture of the prototype 26,119,0 -37,4 4,2-, 871,6 Table Table3 Wasp extraction