SU407965A1 - METHOD OF PROCESSING OF MANGANESE RAW - Google Patents

Description

one

The invention relates to metallurgy, in particular to the processing of manganese raw materials.

There is a method of processing manganese raw materials by melting with carbon with the release from the furnace of dephosphorized slag and obtaining in the furnace a metal melt containing 40-70% manganese, 1.5-4% phosphorus, and 1% silicon and 3-5% carbon, the rest - iron.

A distinctive feature of the proposed method is that after the slag is discharged, manganese ferrophosphorus, a by-product of the production of yellow phosphorus in relation to a 1-2: 1 metal melt, is introduced into the metal melt remaining in the furnace and melted. This makes it possible to obtain, together with the slag, a second commercial product, ferromanganofophor.

After the manganese slag is again discharged from the furnace, a second melting period is carried out, during which crushed manganese ferrophosphorus containing 15-28% phosphorus, 2-15% manganese is introduced into the mirror of the metal melt, and the rest is iron, which is a byproduct of yellow phosphorus production. Ferrophosphorus is introduced in a ratio of 1-2: 1 relative to the weight of the metal melt formed during the smelting of slag. Upon reaching the melt temperature

1250-1400 ° C. The resulting ferromanganophosphorus is released into the ladle.

The advantage of the proposed technology is that instead of phosphorous

ferromanganese cost 57-92 rubles / t and

ferrophosphorus worth 60 rubles per ton get

standard ferromaganophosphorus cost

187-237 rub / t.

This will make it possible to exclude the smelting of a hundred garnet ferro-mantanophosphorus from manganese phosphorus-containing ores and concentrates in a blast furnace.

Example. In a 5.0 mva furnace that melts pig manganese slag

In a batch process, in the next release of slag, in a metal melt (4.5 tons), 6.8 tons of manganese ferrophosphorus containing 7% of manganese and 26% of phosphorus are included in the switched on electric furnace. Melting and heating continue for 53 minutes. in another mode (160-170 V, R 4.8 MW). After the removal of electricity (3720 kWh), the alloy is produced in two cascaded steel ladles with slag garnissage. Then the alloy is poured into cast iron pallets. Receive 10 tons of ferro-mantanophosphorus with a phosphorus content of 15%, manganese 25%, corresponding to the technical conditions 4MTU5-34-70. The specific consumption per ton of alloy is 372 kWh of electricity, 450 kg of useful metal, 450 kg of manganese ferrophosphorus. The subject of the invention is a method of processing manganese raw materials 5 by smelting carbon with discharging slag from a furnace and producing a metallic melt in the furnace, characterized in that, in order to obtain, together with the slag, a second marketable product, ferromanganophosphorus, after the slag is released, g remains in The metal melt furnaces injected manganese ferrophosphorus, a by-product of the production of yellow phosphorus in relation to a molten metal ratio of 1-2: 1, and melted.