SU996491A1 - Method for processing polymetallic copper-containing sulfide concentrates - Google Patents

Description

one

The invention relates to non-ferrous metallurgy and can be used in electropavage of copper-containing copper-containing sulphide concentrates.

There is a method of processing polymetallic copper-containing sulfide concentrates by electrofusion with the supply of lime, converter slag, pyrite, and coke in a reducing atmosphere. The method involves reducing the loss of non-ferrous metals with slags by loading into the slag end of the furnace pyrite, ore or pyrite concentrate 1.

The disadvantage of this method is the low extraction of Pb and Zn in sublimates.

The closest to the invention is a method of processing polymetallic copper-containing sulphide concentrates by electrofusion with supply of converter slag, limestone and coke, with a ratio of 20 limestone to coke equal to 23: 1 2.

The main disadvantage of this method is the low output of Pb and

Zh in sublimates, respectively 8,5О% and - 9,80%. When converting the obtained matte, only about 5% of CMiHua is extracted into sublimates, 25-30% of lead goes into slags of the first period and is returned back to the electric furnace, the remaining part of 2O-25% remains in white matte. During the subsequent purging of white magta, the metal of the pigs concentrates in copper, some of it is oxidized and goes into slags of the second period. The production of high-quality rough copper is carried out by overproduction of copper, in which case additional oxidation and separation of lead occurs, followed by significant copper oxidation. Zinc in the amount of 75-80% goes into slags of the period, and returns back to the electric furnace, and only 20-25% of the total amount in the matte turns into sublimates.

The purpose of the invention is to increase the recovery of lead and zinc in sublimates.

The goal is achieved by the fact that the electric smelting of polymetallic steel: {common sulfide concentrates with limestone, coke, and converter slag feed lead to the separation of the molten bath into the melting zone and the reduction zone, the latter being fed coke and limestone in layers in a ratio of 1 :( 4-8). The process is carried out in an electric furnace with a divided vertical partition that does not reach the inclined hearth on the seam of the part. In the greater part of it, the melting zone, the concentrate melts and accumulates matte, and in the smaller part, the zone of reduction and the molten concentrate load coke and limestone in layers. At the same time, coke is loaded first, electrons are lowered onto it, and This makes it possible to obtain a temperature of 2000 s near the electrodes in the recovery zone. Under these conditions, calcium carbide is obtained from a reducing mixture (coking and limestone). The interaction of continuously forming calcium carbide with the components of the melt leads to the reduction of oxides of pig, zinc, copper and iron, lead and zinc are sublimated. The metal jelly formed, the passage through the melt layer, interacts with the failed to reduce with the oxides of non-ferrous metals. As a result, the recovered lead and zinc are sublimated into the gas phase, and copper and metallic iron flow down an inclined bed to the melting zone. When this is dissolved in matte, they metallize it. In the metallized matte, reactions occur that promote the displacement of lead and zinc and slag. Lead and zinc expelled from the matte in the smelting zone are transferred to the slag and to the reduction zone, where they are sublimated. Thus, under these conditions, maximum extraction of lead and zinc is carried out in sublimates. The lower limit of the reducing charge, the ratio of coke and lime, is 1: 4, applied with minimal presence of iron oxides in the initial charge or with minimal supply of converter slag. If there is a large amount of iron oxides in the initial charge, or at the maximum supply of converter slag, it is necessary to work at the upper limit of the reduction charge, the ratio of coke and lime is 1: 8. 9 14 The method allows, due to better ole of lead and zinc in sublimates and recovery of copper from slag and removal of its melting zone, to obtain waste varnish poor for uBeriaJM metals and therefore suitable for making construction materials and cast products. The method was tested in enlarged laboratory conditions on a six-electrode furnace with an inclined hearth and a divided vertical partition into two zones. Example 1. The initial concentrate in the amount of 100 kg is melted in an electric furnace with the addition of 31.5 kg of converter slag. 2 kg of coke is loaded into the charge molten to 12OO ° C in the reduction zone and electrodes are lowered onto it, then 8 kg of lime are loaded from above (the ratio of coke: limestone to 1: 4). The process is carried out until complete burnout of the reducing mixture. It turns out: matte in the amount of 65.6 kg; slag - 6O, 8 kg; sublimates - 9.1 kg. Extraction to sublimates is: Pt — 88.07 and In — 86.94. Example 2. The initial concentrate in the amount of 86 kg is melted in an electric furnace with the addition of 44.5 kg of converter slag. 4 kg of coke are loaded into the molten mixture to 1200 ° C in the reduction zone and electrodes are lowered onto it, then 24 kg of lime is charged from above (the ratio of coke: lime to 1: 6); The process is carried out until complete burnout of the reducing mixture. It turns out: matte in the amount of 59.7 kg of slag - 71.8 kg; cars - 12 kg. Extraction into sublimates is: Pt) .- 96.4 and Zn- 92.4. P p | I M 3. The initial concentrate in the amount of 1OO kg is melted in an electric furnace with the addition of 31.5 kg of converter slag. 6 kg of coke is loaded onto the molten mixture up to 1200 in the reduction zone and electrodes are lowered onto it, then 48 kg of lime are charged from above (the ratio of coking: limestone to 1: 8). The process is carried out until complete burnout of the reducing mixture. It turns out: matte in the amount of 58.7 kg; slag - 83.1 kg; sublimates 13, 7 kg. Recovery to sublimates is: Pb — 96.4% and Zn — 96.06%. Thus, this method of processing polymetallic copper-containing sulphide concentrates allows: lead and zinc to be completely distilled off at the stage. 59S64 electric smelting in all springs {lead extraction in sublimates 88.07-96.4%, extraction of Zn - 86.94-96.06%); obtain waste slags suitable for the production of cast products and building materials; get a metal matte matte, which improves the after-effects of tweaking its processing; improve quality rough || meav after converting; provide tailing processing concentrates. The table shows a comparative calculation of the efficiency of processing of the OOOOOt concentrate.

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12 LLC Total As can be seen from the table, the costs for electric smelting by the proposed method exceed the costs for the basic method of 96,000 rubles, at a price of coke 24 rubles / t: However, the amount of lead and zinc in electric furnace according to the proposed method is obtained in monetary terms Blurred:

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Claims (2)

24 1О8 ООО more than 1О4О230-3851 25 6551 ОЗруб Consequently, electroplating gives additional profit 055 1О5-96 ООО 559 105 rub. The invention of the method of processing popimetapichnyh copper sulphic sulfide Co1centra 70964918. electric lime feed, 1. Kershansky I.I. and others. Introduction coke and converter slag, оg p-melting of granulated copper-containing This is due to the fact that, in order to charge the charge in the rudiothermic furnaces. Extending Lead and Zinc to Sublimates, Elec-Non-Ferrous Metals, 1976, No. 3. Track is carried out with the separation of the melt j to the melting zone and the recovery zone 2. Ceft A.L. and others. Liquidation neither, and limestone and coke are served by electric copper smelting concentrates the zone of restoration in layers in the ratio of Zhezkazgan to high cal. (4-8) 1 slags. Sat Tsvetna metallurgists. TRiS source information.YUD Institute of Metallurgy and Enrichment taken into account in the examination of the Kazakh SSR, 1963. t.