SU697585A1 - Method of refining sulfide materials containing non-ferrous metals - Google Patents

Description

one

The invention relates to non-ferrous metallurgy and can be used in the processing of sulphide ores and concentrates containing non-ferrous metals by a kivtset process. : There is a method of processing sulfide materials containing non-ferrous metals, including roasting-smelting and electrothermal refining of the melt-L-ina.KOBoro melt with the addition of pshakoobrazuyuschih, containing oxides of alkaline-earth metals and silicon 1.

The method is accompanied by large mechanical losses with a Sdakov melt.

The purpose of the invention is to reduce the mechanical losses of copper with slag.

This is achieved by the fact that slag-forming additives of 17-40% by weight of the matte-slag melt are fed to its surface at the electrothermal processing stage with a ratio of alkaline-earth oxides of meta-flux to silicon oxide 0.01-1. slag used for electric smelting of copper concentrates.

The method is carried out as follows.

The crushed copper-zinc sulphide concentrate is autogenously melted in the stream of technical oxygen, the resulting matte-slag melt peat flows into the electrothermal part of the unit, where a mixture of oxides is fed to the surface of the melt. At the same time, slags can be used as a mixture of oxides, for example, obtained during electrothermal processing of copper concentrates and having grade,%: SiO, 56.78, CaO 12.61, Pe 9.25.

PRI im p Sulphide oxide

5 mixture of composition, wt.%: Cu2O4, CujjS 34.6, FeO 38.2, .S, FeS 0.9, ZnS 0.6, melted in corundum crucibles in an electric resistance furnace in an argon atmosphere at 1300 s.

0 The composition given by cyJif-acid oxide corresponds in its composition to the matte-slag melt obtained in the case of roasting-smelting of a charge that does not contain CaO and SlOg (experiment 1).

five

To clarify the effect of SiOj and CaO additives on the delamination process of the matte-slag melt, the experiment was carried out with different amounts of added flux to the starting material,%: 6, 12, 25, 40, while

using the flux composition, wt.%: CaO 17, SiO283, (experiments B). In addition, for comparison, experiment (2) is carried out, which reproduces the results of roasting-smelting the mixture with the addition of CaO and SiO (i.e., the mixture that is subjected to roasting-smelting on operating industrial cement plants).

Methodically indicated experiments were set as follows.

.1 - The initial sulfide-oxidized mixture of the above composition is melted

and incubated for 15 minutes (without flux).

2- To the initial sulfide-oxide mixture, the flux is added in the amount of 25% by weight of the initial material and melted, followed by holding the melt for 15 minutes

3- b - flux in the amount of b% (3), 12% is fed to the surface of the molten sulphide-oxide mixture.

(4), 25% (5) and 40% (6) by weight of the melt and incubated for 15 min. The results of the experiments are given in Table 1.

.Table 1

As can be seen from the table. 1, when the flux is added after the initial material is melted (tests 5-6), the copper content in the slag significantly decreases (as compared with the results of experiment 2, the conditions for which are close to the existing technology for processing sulfide lead, copper and zinc-containing materials) According to microscopic studies of frozen slags, this is achieved by reducing the amount of matte suspension in the silicate phase. The data given in table. 1 also indicate that the copper content in the slag varies depending on the ratio of the flux to the starting material. However, the observed decrease in the copper content in the slag with an increase in this ratio may occur due to the diluted slag (provided that the amount of copper in the slag remains at the same level). In connection with this, it is necessary to evaluate the loss of copper with slag and the ratio of matte-slag. Mi15 15 15 15

1.0

0.7 0.4

0.01

Claims (2)

80 80 80 80 minimum absolute losses of copper with slag (no more than 3.4%) correspond to areas with a ratio of flux to the starting material in the range of 17-40%, and the preferred ratio is 24% (absolute losses of copper with slag - 3.1 %). A rather wide range of flux-to-raw material ratios, which allows for minimal copper losses to be realized, suggests that the proposed method can produce copper-rich mattes from raw materials with different C contents. In order to determine the effect of the CaO and SiO content in the flux additive on the copper content from the silicate phase, experiments were carried out (using the same procedure as the W-b experiments), in which the flux ratio — the starting material is 25%, and the CaO ratio (((( SiO2 varies in the range: 1.0 + + 0.01., The results of the experiments are presented in Table 2. Table2 As can be seen from Table 2, with decreasing Cao / SiOj ratio, from 1 to 0, the copper content in the slag decreases from 3.28 to 0.97%. The indicated changes in the content of Meo in the flux ratio refer to the case when the content of zinc oxide in the slags The melt does not exceed the order of 3%. If the ZnO content in the slag exceeds this value, the range of changes in the amount of MeO in the composition of the flux is reduced. This is due to the fact that alkaline earth oxides, such as CaO, are in the charge leads to an increase in the loss of zinc with slag, i.e., a decrease in the rate of distillation of zinc during the recovery of silicate melt.Based on the data (see Table 2) and the above results, it follows that to ensure minimum losses of copper and zinc simultaneously recyclable high CaO / SiOj ratio in the composition of the charge should be in the range of 0.11-0.57, preferably 0.4, Under the conditions of industrial processing of copper and copper-zinc sulfide concentrates, the copper content in the slag is reduced due to a more complete separation matte-slag melt will reduce the loss of copper with slag by about 2 times. As applied to the copper technology of processing copper-zinc sulfide concentrates, such a reduction in copper losses from waste slag will make it possible to additionally receive 43.7 tons of copper per 1000 tons of processed raw material. The advantages of the proposed method compared with the known methods are: reduction of copper losses, noble and rare metals with slag by reducing the amount of sulfide phase suspension in silicate melt; the possibility of obtaining copper-rich mattes with small absolute copper losses with waste slag; involvement of non-ferrous metallurgy in the process; an increase in the calorific value of the source material, which, during roasting-smelting, will allow an increase in the content of sulfur dioxide in the exhaust gases. Claim 1. Method of processing sulfide materials containing non-ferrous metals, including roasting-smelting and electrothermal processing of matte-slag melt with the addition of slag-forming, containing oxides of alkaline earth metals and silicon, in order to reduce the mechanical loss of copper with slag, slag-forming additives of 17-40% by weight of the matte-slag melt are fed to its surface at the stage of electrothermal treatment with a ratio of alkaline earth metal oxides to silica 0.01-1, 2. A method according to claim 1, characterized in that slag is used as a slag-forming additive for electric smelting of copper concentrates. Sources of information taken into account in the examination 1. USSR author's certificate 492573, cl. C 22 V. 5/08, 1975.