SU950787A1 - Method for converting copper-nickel mattes - Google Patents

Description

one

This invention relates to non-ferrous metallurgy, in particular to the conversion of copper-nickel mattes.

There is a known method for converting a copper-nickel matte, which involves blowing it with air oxygen to matte, during which iron is oxidized and converted into slag using fluxing silicate additives, specified in an amount that ensures the production of silicate slag with a silica content of 23-260 / 0 1.

The disadvantages of this method are obtaining a large volume of slag, low lining durability, and low utilization rate of the converter under blast.

The closest in technical drying and the achieved result to the proposed method is the conversion of copper-nickel matte, which includes blowing it with air at 1140-1240 ° C, slagging iron with quartz flux to produce matte and converter slag with a silica content of 17-20% 2.

The drawbacks of the method are limited air throughput.

due to the high viscosity of the slag, the low utilization rate of the converter under blast due to the significant downtime of the converter when draining a large amount of slag produced, the low durability of the lining due to the high content of silica in the slag and the associated duration of the converter campaign limited processing own cold turns, low extraction of non-ferrous metals.

ten

The aim of the invention is to intensify the process, increase the campaign of the converter and increase the recovery of non-ferrous metals.

The goal is achieved by the fact that with the method

15 converting copper-nickel mattes, including the supply of quartz flux, matte blowing with air, transfer of iron into slag and matte cooking, quartz flux is set only for matte cooking in the amount of 15-20% of the cooking mass, and slag iron is slag from cooking matte and silicon-containing revolutions. The proposed method was tested in industrial conditions at the Norilsk Mining and Metallurgical Combine. Test

conducted on a horizontal converter with a capacity of 100 tons on a copper-nickel matte of the following composition: copper 8.5-9.5; nickel 13.8-14.5; cobalt 0.50-0.53; sulfur 23.5-24.5; iron 50,5-52,0; the rest is other.

Example / (by a known method). 5 buckets of matte (75 tons) are poured into the converter and blown with air at a flow rate of 610 / min. Set 15 tons of quartz flux and esh, e

2 pieces of matte (30 tons) and after 40 minutes of blowing, slag is obtained. Slag in quantity

4 ladles (60 tons) are drained within 25 minutes. The composition of the slag is following; %: Ni 1.9; Si 1.8; Co 0.40; SiOz20,5; the rest is iron, oxygen and others.

After the slag is poured into the converter

A bale of matte (45 tons) is blown with air at a flow rate of 610, 25 tons of quartz flux are charged, and after 60 minutes the process is followed by slag. Slag in quantity

4 coils (60 tons) are drained for 25 minutes. The slag composition is as follows:% Ni 1.9; Si 1.8; Co 0.40; SiOz 19.5; the rest is iron, oxygen and others. After the slag has been drained, the remaining cooking mass in the amount of 70 tons is flushed to matte. Duration blowing 25 minutes, air flow 620 minutes. The converter converter with this technology is 26 days.

Example 2 (according to the proposed method). All operations and composition of the products of example 1 to obtain the cooking mass, but the quartz flux in the amount of 10.5 tons (the amount of the cooking mass is 70 tons) is added to the resulting cooking mass, which corresponds to 15 / o of the weight of the cooking mass. The cooking mass is then purged until matte is obtained. Purging time is 22 minutes. Air consumption 680 / min. After the matte is discharged, the fresh matte in the amount of 5 buckets (75 tons) is poured onto the cooking slag remaining in the converter and blown with air without adding quartz flux at an air flow rate of 680, another 2 matte buckets are poured (30 tons) and after 35 minutes of blowing, slag is obtained . The slag obtained in the amount of 3 buckets (45 tons) is drained within 20 minutes. The slag composition is as follows:% N1 2.1; Si 1.95; Co 0.41; SiOa 10.5; the rest is iron, oxygen and others. After the slag is drained, 3 buckets (45 tons) of matte are poured into the converter, 20 tons of silicon-containing rotations are charged and purged for 55 minutes at an air flow rate of 680. Receive slag in the amount of 3.5 buckets (57.5 tons), which is drained within 22 minutes The composition of shlak following Ni 2,0; Si 1.85; Co 0.4; SiO 12.5; the rest is iron, oxygen and others. The resulting cooking mass is treated as described above. The converter converter by the proposed method is 34 days.

Examples 3-5 (according to the proposed method). All operations are carried out according to Example 2, but 9, 14 and 15 tons of quartz flux are added to the cooking mass, which makes 13, 20 and 22%, respectively, of the weight of the cooking mass.

The results of converting copper-nickel mattes according to the known and proposed methods according to the examples are given in the table.

The amount of quartz flux added to the cooking

Flow blow ng / min

Durability

blow min

The amount of slag, t

Duration of the drain

slag, min

Campaign Converter,

days

The composition of the slag,%: C

N1

With

Sioj

20,660

13

22,650

685

89 101

93

95

114.5

110

42.5

45

48

The proposed method allows to intensify the conversion process by increasing the throughput capacity of the converter by blow by 8.9670; increase the time spent by the converter under blast by 8.5%; increase the working campaign of the converter by 21.270; increase the direct extraction of non-ferrous metals by increasing the processing of cold turns.

In addition, the proposed method does not require additional equipment.

Claims (2)

1. Tavastshernna S. S., Karasev Yu. A. Conversion of copper-nickel mattes. M., 1972, p. 4-6. 2.Converting the copper-nickel matte. Technological instructions. Ministry of Nonferrous Metallurgy of the USSR, “Ally, Norilsk Mining and Metallurgical Combine them. A.P. Zavengina, Norilsk, 1980, p. 48-51.