SU1154352A1 - Charge for depletion of metallurgical slag - Google Patents

Abstract

THE CHARGE FOR LUNGING THE METALLURGICAL PSHAKA, containing a sulphide material-, ferrous alloy and flux, characterized in that, in order to increase the degree of extraction of non-ferrous metals from the shpak, formed during suspended smelting of sulphide antimony concentrate, containing noble metals, the template also contains a set of xanthi material and coal, and as a sulphide material - sulphide antimony material in the following ratio, wt.%: Sulfide antimony material. . 15-25 Oxygenated antimony material 35-45 (L Stone coal. 10-20 Ferrous alloy 2-8 FluxOstal

Description

The invention relates to non-ferrous metallurgy and is intended for the depletion of slag suspended smelting of sulfide antimony containing precious metals. The carbonaceous reducing agent ll is widely used as an additive in the depletion of donkeys in the melting process. However, due to the low speed of the coal recovery process, there are high losses of colored metaplates with slags. The closest to the technical cyiHHTHTH and the achieved result to the proposed is the mixture for the depletion of metallurgical slags, sulphide sulphide material, ferrous alloy and tixnioc. Known shi ta contains, wt%: sulfide material 15-70, flux 5-30j ferrous alloy the rest 2j. The disadvantage of the charge lies in the fact that, due to the formation of the matte phase, it does not ensure the complete extraction of non-ferrous metals from slags. The purpose of the invention is to increase the degree of extraction of non-ferrous metals from the slag formed during suspended smelting of anhydrous sulfide. concentrate containing noble metals. The goal is achieved by the fact that the charge for the depletion of metallurgical slag, containing sulfide material, ferrous alloy and opus, additionally contains oxidized antimony material and coal and in the quality of sulfide material of sulfide antimony material in the following ratio of components,%,%: Sulfrgish antimony material15-25 ... Oxidized antimony material. 35-45 Kame1P1yy coal 10-20 Ferrous alloy 2-8 FluxEverything else. Concentrate ore is used as sulphide antimony feet of the material. Oxidized antimony materials are cinders, sublimates, donkeys from fire refining of black antimony, cake from: sulfide-1 procedure in the field of antimony raw materials sodium antimonate or their co-optimal combination. Ferrous alloy injected 2 2 Dits in the form of cast iron or iron. and the juice is limestone or / and soda ash. The introduction of oxidized and sulfide 1x antimony materials into the mixture is necessary to obtain the extracting material. phases — metallic antimony as a result of the reaction of the sulphone and oxides. Antimony enters the volume of the slag bath, collects noble metals in the slag, and associates with the simultaneous sedimentation a tocodispersed suspension of metallic antimony formed during the coal-heat and metal-heat reduction of depleted slag antimony oxides. The ratio of antimony materials is predetermined by the conditions of the reaction interaction, which influences the extraction of metals from the shpak. The content in the charge of sulfide antimony material is less than 15 wt.%, And that of the oxidized antimony material is more than 45 wt.% Leads to metal loss due to the transition of antimony oxides to slag. An excess of sulfide antimony materials (over 25 wt.%) And, equally, a lack of oxidized antimony materials (less than 35 wt.%) Contribute to the formation of the matte phase, which complicates the process of depletion and leads to a decrease in the extraction of metals from slag: a . The introduction of coal into the charge is necessary to ensure the coal-thermal reduction of antimony oxidation. The amount of coal is due to the initial content of recoverable metals in the slag, antimony materials in the charge, the quality of the rough antimony obtained by iron and conditions that exclude the formation of the matte phase. The minimum content of coal (10 wt.%) Is limited by the need to reduce the antimony oxides contained in the slag and remaining after the reaction interaction of the antimony batch materials. Increase in coal. in the charge, more than 20 wt.% leads to the formation of the stein phase and to the enc, the quality of rough antimony as a result of the transition of the metallic and iron gland into it,

reduction of iron silicates and calcium ferrite slag.

The content in the mixture of ferrous alloy is necessary to reduce the loss of non-ferrous metals as a result of the destruction of spack magnetite and antimony sulfide remaining after the reaction interaction of the antimony materials of the mixture, as well as for the metaplothermic content of the ferrous alloy in the slag bath volume. The minimum content of ferrous alloy in the charge (2 wt.%) Is maintained in order to increase the recovery of metals from slag. The maximum content of the ferrous alloy in the charge (8 wt.%) Eliminates the formation of the matte phase and an excessive transition of iron to the rough. antimony

Limestone or / and soda ash is used to slag nonmetallic minerals of antimony materials and coal ash. The introduction of a flux or a combination thereof is determined by the composition of non-metallic minerals and the composition of the lean sludge. The flux content in the charge is determined by the conditions for obtaining the slag, commensurate with the electrical conductivity (0.2-0.3 cm) of the depleted slag, i.e. ensures the stability of the electric mode and the minimum

loss of non-ferrous metals.

Slag depletion in the suspended melt of sulfide antimony raw materials containing noble metals was carried out in the electrothermal zone of the unit by loading the charge onto the bath surface. The components of the mixture are metered, thoroughly mixed and granulated with water. The granular batch of 58 mm granularity is dried to a residual moisture content of 0.5-1% at a temperature not exceeding. Consumption blend. To the original slag 40 wt.%. The temperature of the depletion process is 1280-1350 C. The feed rate of the charge is maintained so that in the gas space of the depletion zone there is a reducing atmosphere (carbon monoxide not less than 6/8% by volume, free oxygen not more than 1-2% by volume). 60 minutes before the release of the furnace from the furnace, the charge loading is stopped. Monitoring the depletion process is carried out iio content of colored metals in the donkey.

Example 1. The slag of suspended smelting of a sulfide gold / antimony concentrate is depleted, in which it contains, in wt%: antimony 18.6; silicon 54.3J calcium oxide 19.2; iron oxide 14.5 and 16 g / t gold. Charge consumption 40% by weight of slag. Hinged shpak 0.5 kg. The temperature of the experiments is 1300 C. The temperature is monitored by an immersion platinum thermocouple. The electrical conductivity of Shpak is determined at a temperature of 1300 C. The granulated mixture is loaded onto the surface of the molten slag and held for 1 hour. Then the products are cooled, weighed and analyzed.

The results of the slag depletion experiments are shown in the table.

t:

S

Slag impurity charge provides high rates of extraction of antimony and gold in the rough metal. Example 2 In the factory, 360 g of the suspended smelting sulphide stockpile smelting concentrate was depleted. Slag composition, wt.%: Antimony 18.6, silica 54.3, calcium oxide 19.2, iron 14.5 and 16 g / t gold. Electric power of the unit is 2500 kVA.

The test results depletion pshaka:

Entry rate; liquid slag to the depletion zone, t / h 0.56 Electricity consumption per 1 ton of slag, kWh510

Pshak temperature, C 1310; Consumption of the charge to the weight of the depleted kebab,% 40 Composition of the charge:

iron shavings 5. limestone to 20 antimony sulphide concentrate 20 oxidized antimony material 40 hard coal 15 Yield of smelting products per 1 ton of depleted speck,%:

recovered slag95,1

chernova surmi 26,6 oxidized 3.2

The composition of the donkey after

depletion:

antimony,% gold, g / t

The composition of the draft

Antimony:

antimony,% gold, g / t.

Metal recovery

in draft antimony,%:

antimony

gold

Metal loss from

ass,%:

antimony2.71

gold2.07

The advantages of the proposed process are that the loss of antimony and noble metals with slags does not exceed 2-3%, and the matte formation of matte and the quality of rough antimony are improved.

Claims (1)

MIXTURE FOR DEPLETION OF THE METALLURGICAL CASE, containing sulfide material., A ferrous alloy and flux, characterized in that, in order to increase the degree of extraction of non-ferrous metals from the heap, formed during suspended smelting of antimony sulfide concentrate containing noble metals, it additionally contains oxidized antimony material and coal, and as a sulfide material - antimony sulfide material in the following ratio of components, wt.%: Antimony Sulfide material 15-25 Oxidized antimony k0 material 35-45 ω Coal . 10-20 Ferruginous Flux alloy 2-8 Else FROM SY SO sl ke> 1 154352