RU2298587C1 - Method of processing sulfide copper-containing poly-dispersed materials - Google Patents

Abstract

FIELD: non-ferrous metallurgy; processing copper sulfide materials, nickel-containing inclusive into blister copper.

SUBSTANCE: proposed method includes oxide treatment of raw material simultaneously in two separate flows. Treatment of material whose size is lesser than 0.1 mm is performed in suspended layer in prechamber at delivery of oxygen in the amount up to 65% of theoretically required amount for complete oxidation of entire mass of sulfur, iron and admixtures to oxides; the remaining part of raw material whose size is 0.1-50 mm is molten together with fluxes in fluidized layer of melt at gas load of 1-3 m/s in chamber provided with slag lining. Oxygen insufficient by stoichiometry is blown into chamber through bottom blast units, thus maintaining gas content of melt within 0.55-0.9.

EFFECT: increased specific productivity; reduced content of copper in slag at melting into blister copper; increased operating time of unit.

2 cl, 1 dwg

Description

The invention relates to the field of non-ferrous metallurgy and can be used for the processing of copper sulfide, including nickel-containing, raw materials for blister copper.

A known method of continuous processing of copper concentrate on blister copper (RF patent No. 2169202, publ. 06/20/2001). According to this method, the concentrate is smelted in a melt bath, purged with an oxygen-containing gas to produce a metal phase (blister copper) and slag, maintaining the height of the oxide-slag layer within 0.3-0.8 of the total height of the melt bath. The main disadvantages of this method are the high copper content in the slag (22.2%), the low sulfur dioxide content in the exhaust gases (20-25%), the periodic change in the charge load and the supply of oxygen-containing gas, the periodic release of smelting products, limiting the duration of the working campaign of the unit resistance to refractory lining.

The closest in technical essence is the method of processing sulfide copper-containing polydisperse materials (AS USSR No. 1741439, publ. 08/20/1996), including oxidative smelting with the production of sulfide-metal copper alloy by supplying raw materials simultaneously in two separate streams, one of which ( raw materials with a particle size of less than 1 mm) without fluxes are melted on a matte in a torch at 1550-1620 ° C, which is regulated by the supply of oxygen to the torch within 36-52% of the sum of the mass of sulfur and iron of the material supplied to the torches, and smelting of the second stream (raw materials upnostyu 1-50 mm) together with fluxes is performed in the molten bath, an oxygen-containing gas sparged. The main disadvantages of the method are low specific productivity, high copper content in slags (1.13-3.55%) when smelting blister copper, periodic output of smelting products, limiting the duration of the working life of the refractory lining.

The technical problem solved by the proposed method consists in increasing the specific productivity, reducing the copper content in the slag during melting on blister copper and increasing the duration of the working campaign of the unit.

The problem is solved in that in the known method for processing sulfide copper-containing polydisperse materials, including the oxidative treatment of raw materials simultaneously with two separate streams, according to this proposal, the processing of raw materials with a particle size of less than 0.1 mm is carried out in a suspended layer in a prechamber, and oxygen is supplied to the prechamber up to 65% of theoretically necessary for the complete oxidation of the entire mass of sulfur, iron and impurities of the supplied material to oxides, and the rest of the raw material with a particle size of 0.1-50 mm melt together with fluxes in the fluidized bed of the melt with a gas load of 1-3 m / s in the chamber with a skull lining, and the oxygen that is missing in stoichiometry is blown into it through the bottom blasting devices, maintaining the gas content of the melt in the range 0.55-0.9.

In addition, with this method, liquid copper matte can also be supplied to the melting chamber.

The proposed method is implemented in the device shown in the drawing. The device comprises a charge-oxygen burner 1 installed in the prechambers 2 adjacent to the chamber 3 with a skull lining. The chamber 3 with a skull lining is equipped with bottom blowing devices 4, an overflow threshold 5. A suspension of charge materials in an oxygen stream leaving the charge-oxygen burner 1 forms a suspended layer 6 inside the prechamber 2.

The method is as follows. Burden materials - copper finely dispersed flotation concentrate, liquid copper matte and fluxes - are fed for processing in two streams.

The first feed stream with a particle size of less than 0.1 mm is continuously fed through a charge-oxygen burner 1 together with the process oxygen to the prechamber 2, where the feed is saturated with oxygen in the suspended layer 6. The process oxygen is supplied in an amount up to 65% of the theoretical total required for complete oxidation the mass of sulfur, iron and impurities supplied to the torch material to oxides.

The second stream of raw materials, consisting of solid copper-containing turns and fluxes with a particle size of 0.1-50 mm and liquid copper matte, is continuously melted into blister copper in a fluidized bed of the melt with a gas load of 1-3 m / s in chamber 3 with a skull lining, and blown into it through the bottom blasting device 4 lacking stoichiometry oxygen, maintaining the gas content of the melt in the range of 0.55-0.9.

Liquid smelting products - blister copper and slag - are continuously discharged through overflow threshold 5 and sent for separation. Waste gases with a sulfur dioxide content of up to 98% in a stable and continuous stream are discharged from the smelting chamber and sent for processing by any known method.

Computational experiments on a mathematical model designed to study heat and mass transfer processes in a charge-oxygen torch showed that saturation of copper finely dispersed raw materials with oxygen corresponding to the degree of desulfurization up to 65% with a length of the suspended layer of not more than 0.2 m is achieved in the suspended layer, which is 5 -10 times shorter than known analogues.

Thus, the method of processing sulfide copper-containing polydisperse materials proposed by the present invention allows simultaneously processing continuously loaded solid and liquid copper-containing sulfide materials in one unit; to obtain blister copper and copper-poor slags continuously discharged from the unit, to completely extract sulfur into a continuous stream of exhaust gases with a high (up to 98%) and stable sulfur dioxide content, reduce the volume and localize the selection of these gases in one unit, increase the specific productivity and reduce the dimensions of the unit, reduce irrevocable heat losses to the environment, increase the duration of the unit’s working campaign through the use of skull lining, reduce losses of non-ferrous metals, energy tion and material costs.

Claims (2)

1. A method of processing sulfide copper-containing polydisperse materials, including the oxidative treatment of raw materials simultaneously with two separate streams, characterized in that the processing of raw materials with a particle size of less than 0.1 mm is carried out in a suspended layer in the prechamber with oxygen supply in an amount of up to 65% of theoretically necessary for complete oxidation the entire mass of sulfur, iron and impurities of the supplied material to oxides, and the rest of the feedstock with a particle size of 0.1-50 mm is melted together with fluxes in the fluidized bed of the melt with a gas load of 1-3 m / s in the chambers with garnissazhnoy lining while blowing it through the bottom blowing devices for the missing oxygen stoichiometry while maintaining the gas content in the melt in the range 0,55-0,9. 2. The method according to claim 1, characterized in that when melting in the chamber serves liquid copper matte.