SU1186675A1 - Method of smelting sulfide concentrates - Google Patents

Abstract

THE METHOD OF FLUSHING OF SULFUIDE CONCENTRATES by blowing into the melt by feeding the concentrate through the central, a. oxygen-containing gas through the peripheral channels of the vertical charge-blast tuyere, characterized in that, in order to increase the durability of the tuyere and reduce the loss of metals with dust, the concentrate is fed in a mixture with a carrier gas containing 0.2-1 tons of concentrate per 1 nm of carrier gas and blown into the melt with a flow rate of 3–15 m / s, with a ratio of flow rates of oxygen-containing gas and a mixture of 20: 110.

Description

I

The invention favors non-ferrous metallurgy and can be used to melt copper sulphide and nickel containing copper concentrates.

The purpose of the invention is to increase the durability of the tuyere and reduce the loss of metals from dust.

The supply of the charge with a concentration of 0.2-1.0 tons of nanometers at a rate at the exit of the tuyere of 3–15 m / s ensures a high resistance of the bottom of the metallurgical unit and sufficient reliability of the equipment for transporting the concentrate to the unit. An increase in the concentration of the charge cBbmie of 1 ton / them by reducing its velocity at the exit of the tuyere below 2 m / s creates conditions for disrupting the transport of the charge due to its occurrence on horizontal sections of the transport line.

Reducing the concentration of the mixture below 0.2 t / nm - contributes to a significant increase in speed due to the acceleration of the mixture with oxygen-containing gas in the space between the tuyere nozzle and the melt, which causes an increase in the penetration depth of the blast stream and, therefore, significantly accelerates the hearth of the metallurgical unit. Increasing the speed of the charge in the transport pipeline and the tuyere over 15 m / s leads to rapid abrasive wear.

The significant difference (20 times O) in the velocities of gas and charge particles in the space between the tuyere and the melt provides a lower degree of contact with the exhaust gases. A decrease in this ratio below 20 contributes to an increase in piecheunos due to an increase in the degree of mixing in the charge stream and gas streams and the capture of part of this mixture by exhaust gases, pulling out the high speed from the melt funnel. An increase in this ratio above 100 also causes a decrease in the pypéunos due to a decrease in the depth of penetration of the charge jet into the melt in the center of the blowing funnel due to the low velocity of the charge particles.

It is advisable to maintain an optimal distance during smelting.

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from tuyere to melt. In order to melt sulphide copper concentrates in the proposed mode, it is necessary to maintain this distance equal to 6–12 diameters of the gas channel nozzle. When this distance is reduced, the conditions of operation of the tuyere deteriorate, its resistance is sharply reduced due to its intensive washing off with melt splashes ejected from the blowing funnel. Increasing the distance from the tuyere to the melt over 12–13 nozzle diameters leads to the formation of an end taps on the tuyere around the blow channel, which breaks the aerodynamics of the gas and gas charge streams, which leads to an increase in the flow rate, reduced penetration and, consequently, the formation of wall accretions on the bottom aggregate; ata.

Example. Copper concentrate from flotation separation of matte containing,%: copper 68;

nickel 4.6; iron 3.56; sulfur 22,

dried in the furnace of the fluidized bed (CS)

to a moisture content of not more than 0.5%

and loaded into an airtight container

. (feed bin). During the drying of the concentrate, the electrostatic precipitators of the copper-smelting production are loaded into the KS furnace. Concentrate smelting is carried out in an industrial 30 ton oxygen vertical

The KVK-30 Ts converter is as follows: 1015 tons of liquid matte with a temperature of 1200–1300 ° C are poured into the converter; in the feed bin raise air pressure to

-5 kgf / cm; introducing charge-oxygen tuyere into the converter mouth; include the supply of charge and oxygen to the lance and lower it into the converter to the height of the lance

to melt, equal to 600-750 mm (810 diameters of the tuyere nozzle) and lead the smelting of the concentrate to blister copper, containing 85-90% copper, 5-6% nickel and 1.5-2.5% sulfur. In time

Smelting the mixture is fed through the central channel of the tuyere. The concentration is maintained by varying the flow rate of the transport air to the aerating device of the feed bin; The feed rate of the charge is controlled by varying the pressure in the feed hopper within 4-5 kgf / cm. Charge consumption through charge lance

is 10-12 kg / s; oxygen consumption 1.6-1.8 nm / s. Oxygen enters the lance with a pressure of 810 kgf / cm. The melt temperature in the converter during smelting is maintained within 1250-1300 ° C by varying the flow rates of oxygen and the charge. Melting time 60 mnn. In the converter, 3035 tons of blister copper of the indicated composition are obtained. Launching this copper wedzgt in the usual way.

The test results are shown in the table. . .

Using the proposed method allows autogenous processing of copper nickel 1866754

concentrate in a vertical oxygen converter to a rough

copper. The method provides high

The technical and economic indicators of the process for producing copper can significantly reduce the consumption of liquid fuel for smelting nickel-containing copper concentrate in comparison with the existing methods of processing these concentrates.

Using the method of smelting sulphide concentrates allows one to achieve high equipment durability, minimal dust removal and thereby reduce the loss of non-ferrous metals.

65

0.2

100

one

58

0.7

Dust removal 4%, smelting is normal

Catch 6%, smelting is normal

Dust removal 5%, smelting is normal

Claims (3)

METHOD FOR SULFID CONCENTRATES Smelting by injection into the melt by supplying concentrate through the central and oxygen-containing gas through the peripheral channels of the vertical charge-blowing tuyere, characterized in that, in order to increase the stability of the tuyere and reduce the loss of metals with dust, the concentrate is fed into a mixture with conveying gas, containing 0, 2-1 tons of concentrate in 1 nm ^{3 of the} carrier gas and is blown into the melt at the discharge rate 3-15 m / s, with a ratio of the velocities of the outflow of oxygen-containing gas and a mixture of 20: 110. £ (L