Method for complex reprocessing of metal iron concentrate, containing nonferrous and precious metals

FIELD: metallurgy.

SUBSTANCE: metallic iron concentrate, containing nonferrous and precious metals is melted at the temperature 1400-1600°C with feeding of oxygen-containing wind and not containing flux silicon with forming of metal melt and wustite dross. 70-95% of iron is transferred into the wustite dross, containing less then 5-10% SiO2, and nonferrous and precious metals - into metallic melt with following divided discharge of melt products.

EFFECT: invention provides transferring of major mass of iron into the wustite dross, and nonferrous and precious metals to concentrate in metal alloy, available for further inclusion into the technology of copper-nickel manufacturing.

4 cl, 2 tbl, 1 ex


The proposed method relates to the field of metallurgy and can be used for processing of various raw materials containing metallic iron, non-ferrous and precious metals, including ores and concentrates metal iron.

Known methods of processing materials based on metallic iron containing non-ferrous and precious metals, based on the conversion of iron in the slag, and collectormania base and/or precious metals in the metal alloy.

There is a method of processing materials (scrap and residues from leaching), containing precious metals, base metals, iron, silicon, sulfur, etc. by smelting to matte and silicate slag. Stein then mixed with molten metallic iron, Nickel or copper for translation of platinum group metals, gold and partly of silver in the metallic phase (EPO application No. 0077128, MKI SW 11/02).

Methods based on obtaining silicate slag, do not allow to use the iron-containing slag as raw materials for ferrous metallurgy.

There is a method of processing materials (waste)containing metallic iron, non-ferrous and precious metals (US patent 4451289, IPC SW 1/00). Waste is loaded into a bath of molten copper, together with flux, bath blown with oxygen at a temperature of 1250-1400°C. When it is copper and/or precious metals are transferred into the bath melt and iron in the slag. Melt non-ferrous metals, containing precious metals, is supplied to the conversion.

The disadvantage of this method is the necessity of maintaining a bath of molten copper. Ferrous slag obtained in the refining process, is characterized by a high copper content and is not suitable for use as iron-containing raw materials for ferrous metallurgy. For lowering the melting temperature of slag flux is used, which can also lead to contamination of unwanted toxins for ferrous metallurgy impurities.

A method of refining of concentrates of platinum-bearing ores and secondary products of industrial production, in particular, processes BF and BOF heats (patent RU No. 2224034, IPC SW 11/02). The method includes melting a starting material in the presence of a carbonaceous reductant, followed by concentration of recoverable metals in the iron phase. According to the invention as starting material using a mixture containing not less than 2 g/t platinum group metals, as well as silicate, metal and sulfide components. Carbon reductant take in excess of for full recovery of the oxide components of the iron. Melting lead to the formation of the heterogeneous melt sulfide, silicate and metal phases. Sulfide and Seeley is atny the melt is poured, separating from the metal phase based on iron, Kollektornaya IPY. The PGM content in the metal phase, 50-60% of the mass. The metal phase is drained from the furnace, forming ingots or granulare, and subjected to oxidation treatment to oxidize the iron and full selection of platinum group metals air-blown at a temperature of 1000-1100°C or oxygen-blown at a temperature of 800-1000°C. the Process is carried out in the solid phase oxidation or in the bath melt (Converter, equipped with bottom tuyeres) to complete selection of platinum group metals in the metallic phase.

The disadvantages of the method in the context of this raw material is Novoperedelkino and high PGM content in the target metal phase, which leads to significant losses of precious metals from the slag, because, despite the high distribution coefficient of precious metals between the matte and slag, the amount of metal phase containing 50-60% PGM, ten times lower than the amount of slag.

Closest to the claimed method is integrated processing of materials based on metallic iron containing non-ferrous metals, alloy steels and alloys, Nickel-iron-cobalt alloys and Nickel-hydrogen batteries), including the melting of the processed material and the subsequent oxidation of the melt feed gazoobraznogo oxidant (A.S. No. 494414, CL SW 7/00, 02.04.1974). The oxidizer into the metal melt leads to oxidation and transfer of iron in the slag, and the remaining metal phase at this collective non-ferrous metals.

According to this method, after the melting of the processed material and set the bath in an arc or induction furnace to the surface of the melt is served quartz or soda flux or the flux mixture and the solid oxidizer. Added flux outputs of oxidized iron in a fluid slag. The iron content in the final alloy is 3-15%, this value is directly related to the content of non-ferrous metals in the slag. The reduction of iron content in the alloy to values smaller than 3 wt.% leads to an excessive decrease in the extraction of refined cobalt in the alloy. This is due to the existence of equilibrium in the distribution of iron and cobalt between the alloy and slag, and therefore required a certain minimum residual concentration of iron in the alloy, prevents increased slagging cobalt. Increased concentration of iron in the alloy (>15 wt.%) reduce the efficiency of further processing of the alloy. The obtained alloy enriched with non-ferrous metals, it is recommended to send in copper-Nickel production in the Converter, at the final stage of cooking copper-Nickel matte; cast into anodes to follow what his electrolytic refining to produce cathode Nickel; on granulation and subsequent processing of granulated alloy carbonyl-process.

The objective of the invention is to develop a technology of complex processing of metallic iron concentrates containing non-ferrous and precious metals (mainly ores containing significant amounts of metallic iron, and these components), with intermediates suitable for further processing in ferrous and nonferrous metallurgy. Technical results of the invention are the extraction of iron in the slag on the basis of vustite and preferential extraction of non-ferrous and precious metals in the metal alloy, which is suitable for further involvement in the technology of copper-Nickel production.

The technical result is achieved in that in the method of processing materials constituting the metallic iron concentrate containing non-ferrous and precious metals, including the melting of the processed material and the subsequent oxidation of the melt supply of oxygen-containing oxidizing blast, according to the invention the melting is carried out at a temperature of 1400-1600°C without feeding the silicon-containing flux to oxidation and translation in Vostochny slag 70-99,5% iron source materials.

Melting and simultaneous oxidation of the material may be maintained in autogenous mode accounts for the heat, released during the oxidation of iron.

In the melting process can optionally be entered flux containing alkali and alkaline earth metals.

It is known that oxidative melting materials based on metallic iron containing Cu, Ni, Co, Ag, Au, PGM (platinum group metals), etc., iron will oxidize in the first place, and non-ferrous and precious metals will be collectorbase in the bottom of the metal phase. This is based on several methods of removal of iron and collectormania non-ferrous and precious metals in the metallic phase. Incomplete oxidation of iron (up to 70-99,5%) without filing for melting silicon-containing flux allows you to extract the principal amount of iron in the product is suitable for ferrous metallurgy, and, on the other hand, to save some amount of iron in the metallic phase. Since the basis of the processed product is metallic iron, even at the maximum declared oxidation of iron (99,5%), the content of iron in the melt bottom phase does not drop below 40-50 wt.%. In this part of the molten metal thermodynamic activity of iron in it exceeding 0,35-0,40 and, therefore, thermodynamically complicated formation in the slag phase ferrites, including magnetite, the accumulation of which can lead to heterogenization VOSTOCHNOGO slag and stop the process. Color is haunted and noble metals thus "protected" from oxidation and transition into the slag.

The temperature of the liquidus VOSTOCHNOGO slag, not containing magnetite, will not exceed 1400°C, which is below the liquidus temperature of the metal melt (1400-1500°C depending on composition). The relative fluidity VOSTOCHNOGO slag allows you to refuse submission to the melting of the flux containing SiO2that leads to the production of ferrous slag suitable for use in ferrous metallurgy: slag on the basis of Fe-O with a strictly limited silicon dioxide content (not more than 5-10 wt.%). Bustany slag will be sufficient for normal progress fluidity at temperatures above 1400°C. To adjust the fluidity VOSTOCHNOGO slag may use small quantities of CA-containing flux to produce ferrailleur slag. Increasing the process temperature above 1600°C is impractical due to the aggressiveness of the slag melt.

Even if the feedstock contains some sulphur (up to 1-5 wt.%), the sulfur content in wustite the slag does not exceed 0.1 wt.%, as the main part of the sulphur will be redistributed during oxidative melting between the bottom phase and the exhaust gases of the process. Negligible sulfur content in wustite slag valid for the source of raw materials for ferrous metallurgy.

Oxidative fusion of the processed material provides with the content of copper in the slag is less than 0.2-0.3 wt.%. Therefore, bustany slag is conditioned on the content of the copper raw material of ferrous metallurgy.

Since the oxidation of iron is accompanied by a significant release of heat, the melting process is implemented in autogenous mode: burning fossil fuels needed to heat the aggregate and material when the process starts.

The process is carried out at autogenous furnace feed on the surface of the slag molten metallic iron concentrate. Oven cheshireman, in the operation of the caissons protected from the effects of slag and metal melts the crust. The heat required for melting the material and functioning of the unit, is allocated as a result of oxidation of iron concentrate oxygen blast (air or oxygen-enriched air)supplied through submerged in the slag melt or not submerged lance (lance). The process is conducted at a ratio of feed concentrate and blast that provide oxidation and transfer in the slag phase is the main part of iron (70-99%) concentrate. As the bottom metal phase contains more than 30-40 wt.% iron, the formation of magnetite in the slag bath is minimized. The slag on the basis of FeO retains a high fluidity at temperatures above 1400°C.

The combination of the claimed methods and parameters of oxidative acetylene PLA the key concentrate of metallic iron allows you to receive molten metal phase, enriched colored and precious metals, as well as the slag melt with minimal sulfur content, non-ferrous and precious metals and containing more than 60% Fe and less than 5 wt.% SiO2.

The method is illustrated by an example.

The proposed method for the processing of metallic iron concentrate was tested in laboratory conditions.


The source material is metallic iron concentrate obtained magnetic separation of ore Galtelli intrusion Kureika district of Krasnoyarsk region. The content of the main components in the concentrate of metallic iron ( wt.%, g/t):

Table 1
Content, wt.%
Fe ocil. + Fe silicateCu ocil.SiO2TiO2Al2O3Cr2O3MgOMnOCaOV2O5
Content, g/t

In Lundby crucible volume of 100 ml was loaded suspension concentrate of metallic iron with a mass of 50 grams. The crucible with the material was placed in an induction furnace and heated to a temperature of 1550°C using the indirect heating of the graphite tube. Complete melting of the material was observed at a temperature of 1500°C.

After melting of the material to the surface of the melt were summed blast (air or gaseous oxygen brand CHP). As lance was used Alentova tube with a channel diameter of 2 mm, the Amount of blast - 0.5 l/min oxygen Uptake blast as by blowing air or by blowing gaseous oxygen was 90-95%.

Significant heat due to the exothermic effect of the reaction of oxidation of metallic iron, it was necessary to reduce the load applied to the inductor furnace to ensure the process temperature at the level of 1550°C.

After the desired purge time (weight 50 g, blowing O2≈100% 0.5 l/min, the absorption 95% ((50*0,9)* 15,9994/55,847)*22,4/31,9988)/0,5/0,95=19,0 min) the crucible with the melt is removed from the furnace and cooled in air. The slag is separated from the metal bottom phase. Samples of slag and metal were analyzed by chemical methods.

The content of the main components of the produced slag and metal (wt.%, g/t)and the distribution of the main components of the concentrate between the slag and metal are presented in table 2

As can be seen from the presented data, it was also investigated the composition of the metal, resulting from the smelting of the concentrate without conducting oxidative blowing.

When carrying out oxidative blowing molten slag foaming, which could indicate the formation of magnetite in the complete or almost complete oxidation of iron metal phase was not observed.

Studies have confirmed theoretical background for the practical implementation of the method pyrometallurgical processing of metallic iron concentrate containing non-ferrous and precious metals, with a melt of the metal phase, enriched colored and precious metals, as well as the slag melt with minimal sulfur content, non-ferrous and precious metals and containing more than 60% Fe and less than 5 wt.% SiO2.

Thus, the proposed method allows to process materials based on metallic iron containing non-ferrous and precious metals, with the receipt of slag on the basis of FeO, which is conditioned raw black metal and can be recycled to the extraction of iron and metal alloy based on iron containing color and b Gorodnya metals, which can be recycled together with copper-Nickel matte or sent to hydrometallurgically the redistribution of copper and Nickel production. When this is achieved the extraction of iron in Vostochny slag 70-99,5%, non-ferrous and precious metals in the metal alloy is 50-99%.

Table 2
MaterialMass, gr.Content, % massContent, g/t
NiCuCoAgSFe*FeOSiO2So on.PtPdAuENRhIr
The metal to oxidation purge46,01,050,520,42n/a0,3197,5 0,25,015,52,
Metal2,215,2a 4.94,50,230,2174,30,66110,1330,930,2n/an/an/a
Removing the metal, %Rel. 69,245,151,23,23,698,596,4of 76.8
*estimated value :
n/a - not diagnosed used method of analysis
n/a - not analyzed

1. A method of processing metallic iron concentrate containing non-ferrous and precious metals, including its loading and melting when applying oxygen-containing blast with the formation of molten metal and VOSTOCHNOGO slag, in which the melting is carried out at a temperature of 1400-1600°C With feed containing silicon flux and translation 70-95% of iron in Vostochny slag containing less than 5-10% of SiO2and non - ferrous and precious metals in the metal melt with subsequent separate product melting.

2. The method according to claim 1, in which during the melting process serves flux containing alkali and alkaline earth metals.

3. The method according to claim 1 or 2, in which the process is conducted at autogenous mode.

4. JV the property according to claim 1 ili, in which the metallic iron concentrate load on the surface VOSTOCHNOGO slag melt.


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 // 2350667

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1 tbl