SU588254A1 - Method of melting ferromolybdenum alloy - Google Patents

Description

(54) METHOD FOR MELTING FERROMOLIBDENOUS

ALLOY bottom furnace. The silica, when reduced, goes into the donkey and binds the oxides of nickel and molybdenum into a chemical compound. In this case, part of the nickel and molybdenum remains in the donkey. Then from the melt of the catalyst I recover 50-80% silicon with aluminum. The reduced silicon forms metallic nickel and molybdenum silicides, which are deposited on the hearth and are absorbed by the alloy, which determines the increase in the attraction of elements. Slag containing (%) 50-7.0, 1.0-3.0 gtOj OKHCb calcium else, is separated from the alloy and is used to process steel and ferroalloys. The alloy remains in the furnace. The next {glavku} is commenced by the reduction of moliene and nickel from the catalyst by the component alloy in the furnace. During one campaign, 100–200 tons of molybdenum catalyst are melted down. Then start melting on the new lining. Due to low eiO / j, the Synthetic slag, which is blasted together with the ferro molar alloy, has a high refining capacity with respect to impurities (sulfur and phosphorus) in steel processing. This is because 1-5% of alumina in the slag has a deficit oxygen and corresponds to the connection of Chsobioxy alum nA). Removing silicon / 50% of slag is minimally necessary {about to reduce the Si content of Od in a donkey to 3%, which: increases its refining ability - Removing silicon up to 80% is determined by the inexpediency of further consumption of expensive and scarce reducing agent aluminum with practically remaining other indices. Example. Melting was carried out in an electric arc furnace with a transformer with a capacity of 1500 kV “A. At the beginning of the campaign to obtain ferroccm4olyb ene alloy, 500 kg of ferromolybdenum (61.20% f4o, 0.25% 3 | rest of Pe and impurities), 100 kg of nickel (98% Mi) and 50 kg of ferrosilicon (69.23 % 6, the rest of GW). After soaking the charge and producing a ferrous molybdenum alloy, 2500 kg of molybdenum catalyst containing (%) 10.1 MoO ,, (0,, 3,; 2 the rest, 1200 kg of lime, 100 kg of iron shavings. Silicon of a ferromolybdenum alloy obtained by fusing reduces the oxides of molybdenum and nickel. After 2 h after loading the molybdenum catalyst, 60 kg of ingot aluminum was introduced into the melt to reduce 65% of silicon from the catalyst. About 5 hours after the silicon was aerated, slag was released. The energy of 1 t of the charge was 3200-3500 kW / h. A lot of smelters were loaded onto the previous melting alloy. During one campaign, 25 heats of synthetic slag were spent; .. The average chemical composition of the shpaks selected at the release is given below.

Ni eo

MO

0.09 0.05 63.30 0.03 3.27 3.1 Else

Slag was used to treat steel.

Mo Ni

& i 41.22 14.87 6.17 0.024 0.03 0.015

The ferromolybdenum alloy without grinding was crushed on a large-scale crusher.

in the next two campaigns, the degree of silicon recovery from the catalyst with aluminum was 50 and 80% (the weight of aluminum

SiO Co

The chemical composition of the metal (%) is given 50 below.

Bi 2 "Pb Fe

dnb

78 kg and 96 kg). Comparative melting conducted in accordance with the prototype, i.e. 2500 kg of molybdenum catalyst, 1200 kg of lime and 100 kg of iron shavings were melted and a reducing agent (aluminum) in the amount of 70 kg was melted into the melt. 0.002 0.002 0.002 0.004 0.005 Else

Slag with a content (%) of 0.8 MO, 0.7 Ni, 62.3 AEgO, 8.45 (0, and an alloy containing (%) 38.2 Mo, 10.5 Ni, 0, 8 6t, geostal,

The results of the heats are shown in the table.

The slag refining capacity is greatest in experiment 3, as evidenced by the minimum sulfur content in the alloy. The method of smelting a ferromolybdenum alloy, including the melting of a molybdenum catalyst followed by the recovery of elements from the melt and the separation of metal and slag upon release, characterized in that, in order to improve the recovery of molybdenum and improve the refining properties of slag, has the lowest refining capacity. applied

those 1 (prototype.). Therefore, the quality of the slag by the proposed method, higher than that obtained by a known method.

Thus, the proposed method allows increasing the extraction of molybdenum and nickel in the melts, as well as reducing the silica content in synthetic slag and sulfur in the molybdenum-based alloy. for processing steel, before melting the charge mixture in an electric furnace, a metal melt with a clear silicon content is induced by metaltero-chemical reduction of mopibden and 50–80% silicon from slag of the previous melt. Sources of information taken into account in the examination: 1, USSR Copyright Certificate No. 301361, cl. From 21 September 7, 1970.