SU1333670A1 - Method of producing castable refractories - Google Patents

Abstract

The invention relates to the production of fused refractories used for the lining of particularly important sections of smelting furnaces and out-of-furnace steel vacuuming installations. The aim of the invention is to provide a comprehensive use of the mineral zirconium-containing raw material and to ensure the recovery of refractory rare metals from it. Eudialyte and / or baddelayite concentrate is used as a raw material for D1. Into the mixture, 1–40Z is added from its mass to an iron-containing component. To increase the size of the metal dose. Cooling of the melt is carried out at a rate of not more than 150 ° C per hour. Melted refractories with a tensile strength of 360-510 MPa are obtained. Refractory rare metals are concentrated in an easily separable metal dose (up to 10 wt.%). 1 hp f-ly, 3 tab. (L 00 00 00 05 h

Description

The invention relates to the production of fused refractories and can be used in the manufacture of, for example, steel-teeming glasses, dosing inserts, inserts for slide gates and refractories for lining especially important sections of smelting furnaces and out-of-furnace steel vacuum installations.

The purpose of the invention is to provide a comprehensive use of mineral. zirconium-containing raw materials and ensuring the recovery of refractory rare metals from it, as well as increasing the size of the metal phase,

Example 1. The starting material for smelting is the baddeleyite concentrate of the Kovdor mining and processing combine, and the stabilizing additive was used from the Uglovskoye deposit in the following ratio of components, wt.%:

Baddeleytovy

concentrate90

Known to k10

During the experimental melting process, an iron-containing product — magnetite concentrate — was removed in an amount of 1% by weight of the charge. Melting was performed in a 60 kW electric arc furnace in a reducing environment (for which 5% by weight of graphite was additionally introduced into the charge) under the following mode: current 800–1000 A, voltage 55–60 V, melting time 3 h, surface temperature melt 2050-2750 C. Cooling the fused material block at a rate of 50 per hour, after cooling the block was crushed and crushed lumpy material, after which a metallic alloy containing Nb and Ta was separated on a magnetic separator.

Example 2. Smelting and baddeleite concentrates were used as starting materials for smelting, and kyanite concentrate and technical alumina were used as modifying additives in the following percentage, wt%:

Baddeleyite

concentrate25,

Eudialyte

concentrate25

Kyanitovish

concentrate25

five

.Technical

alumina25

In addition, magnetite concentrate in an amount of 40 wt.% (In excess of 100%) was added as a precipitator of the iron-containing product for concentrating the refractory rare metals. The electric melting was carried out in a reducing atmosphere, for which 15% of graphite was additionally added to the melt in the following mode: current 600-800 A, voltage 55-60 V, duration of melting 2 hours, melting temperature 1900-1950 s, cooling rate of the melt and block in 1

0

0

five

J I. at 1 o'clock

As a result of electric smelting, fused refractory material of a bakor composition and a metal alloy containing refractory rare elements Nb, Ta and ferrosilicon were obtained.

Example 3 "Eudialytic and kyanite concentrates with the addition of technical alumina as a modifier in the following ratio, wt.%, Were used as raw materials for conducting the experimental smelting as a modifier: Eudialyte

concentrate50

Kyanite

concentrate25

Technical

alumina25

As iron containing pro-. Duct was injected magnetite concentrate in an amount of 20 wt.% by weight of the mixture (in excess of 100%), and graphite in an amount of about 10 wt.% was injected as a reducing agent. The charge was melted on the block under the following mode: operating current 400-600 A, voltage 55 V, p-time 3 h, melt temperature 1750-1900 s, CKoJaocTb cooling block 150 C per 1 h. Then the resulting block they crushed and separated the magnetic alloy with a metallic alloy containing refractory metals Nb, Ta, and ferrosilicon from the fused refractory.

As a result of electric smelting, fused refractory material of a bakor (mullite-corundum with addition of baddeleyite) composition, a metal alloy containing Nb, Ta, and ferrosilicon was obtained.

Example 4 “As raw materials for melting are used.

0

Eudialyte, baddeleite and kyanite concentrates were produced in the following ratio, wt%:

Eudialyte

concentrate 25

Baddeleyite

concentrate25

. Kyanite

concentrate. 50

The chemical composition of the starting materials in examples 1-4 are shown in table.1.

In the process of melting in

The charge was additionally introduced with 30 wt.% 5. metal phase, concentrating magnetite concentrate and 15 wt.% graphite. The electric melting was carried out in an arc furnace with a power of 60 kW under the following mode: operating current 500-700 A, voltage 60 V, melting time 3 hours, 20 temperature of the melt 1950 C, cooling rate of the block of fused material 75 C per hour. After cooling the block; .. crushed, the lumpy material was crushed, and using a magnetic separator, a metal alloy containing Nb, Ta, and ferrosilicon was separated.

The chemical composition and physico-technical properties

The proposed method expands the raw material base of the refractory industry and ferroalloy production, improves the complexity of the use of mineral raw materials, and creates waste-free technology.

Claims (2)

1. A method for producing fused refractories while at the same time producing ferrosicily by melting refractory raw materials in a reducing Frame 1-4 of fused materials is driven by the medium, block production, cooling in Table 2. Table 3 shows the chemical content of jTaB ferroalloys obtained in examples 1-4 during the melting of zirconium-containing mineral raw materials. 35 its, characterized in that, in order to ensure the comprehensive use of the mineral zirconium-containing raw material and ensure the recovery of refractory rare metals from it, the eudialyte and / or baddeleiteite concentrate is used as the starting mineral raw material and iron containing component. Analysis of the results given in examples 1-4 shows that the proposed method allows complex, on the basis of cheap refractory mineral raw materials, to obtain highly efficient fused refractories, which, by their physical and technical properties, do not yield to the best samples of domestic and foreign fused melts. lead from the stops, and according to some indicators, the speed is not more than 150 С per hour 333670 for example, by compressive strength, exceeding them due to the reinforcement of the material with crystals of corundum, mullite and baddeleite. This method allows extraction of zirconium-containing mineral from the source. highly refractory rare metals Nb, Ta with a high degree of extraction of IQ. The content of these refractory rare metals in the resulting fused refractory is 1%. By the above proposed method, up to 10% by weight of easily separable material is obtained. metal phase concentrating refractory rare metals. The proposed method expands the raw material base of the refractory industry and ferroalloy production, improves the complexity of the use of mineral raw materials, and creates waste-free technology. Invention Formula 1. A method for producing fused refractories while at the same time producing ferrosicily by melting refractory raw materials in a reducing medium, block preparation, cooling it, characterized in that, in order to ensure the integrated use of the mineral zirconium-containing raw material and ensure the recovery of refractory rare metals from it, the eudialytic and / or baddeleiteite concentrate is used as the raw mineral material and the iron component is introduced into the mixture . 2. The method of pop. 1, which differs from the fact that, in order to increase the size of the metal 1333670 eight. table 2 T blitz 3 1,