SU1027252A1 - Method for processing copper drosses - Google Patents

Abstract

1. METHOD FOR PROCESSING COPPER SLICKERS, including their smelting with alkali metal salts, carbon-containing reducing agent and iron-containing material, characterized in that, in order to increase imitation of lead, the mixture iron lead matte and copper-ferrous intermediate with their ratio (-5): 1 in the amount of 5-30 by weight of the slips. 2. Method pop. 1, distinguishing it with the fact that, as a copper-iron intermediate, bimetal waste of composition, wt.% Is used: copper S6 7-8, iron 92-93. W

Description

yu yu

SP

ISD The invention relates to non-ferrous metallurgy, in particular, to methods for processing lead intermediates for the production of copper slips. There is a method of processing lead intermediates containing lead, copper, sulfur, including their melting at the first stage of the process in an electric furnace with obtaining three phases: rough lead, copper matte and slag. In the second stage, the process was remelted in the presence of carbon containing a reducing agent. The smelting products are rough lead, waste slag and dust t | 1 The disadvantage of this method is low lead extraction (ro 92) due to significant irreversible loss of lead with waste slag (up to 3%) and dust (up to 5%). In addition, this method produces matte that is poor in copper, which requires an additional operation to refine it to obtain a conditional matte, for which matte is sent for conversion. An additional operation also reduces the direct extraction of lead into the ferrous metal. Closest to the invention to the technical essence and the achieved result is a method of processing copper slips, including them. melting with alkali metal salts, a carbon-containing reducing agent and an iron-containing material 2. The disadvantages of this method are low lead extraction and low productivity of the process. The aim of the invention is to increase lead recovery. This goal is achieved by the fact that according to the method of processing copper spikes, including melting them with alkali metal salts, a carbon-containing reducing agent and iron containing glands, a mixture of iron-lead matte and copper - ferrous intermediate with their Cf-S ratio: 1 in the amount of 5 to 30 of the weight of the slip. As a copper-ferrous semi-finished product, bimetallic waste was used, weight |: copper 7-8, iron 92-93. The chemical composition of the processed slips, iron-lead matte and copper-ferrous intermediate is given in table 1, their mineralogical composition is given in table 2. Table 1

Copper brass30-i 0

60-70 kera

10-15 85-90

5-10

90-95

Examples e. Slag components: alumina. OXIDE cream The method is as follows. i At the beginning of smelting, after melting of the -sliners, sodium sulfide is formed by the interaction of lead sulfide with soda and a reducing agent. At the same time, the extraction of lead to metal reaches 70-75, since a significant part of it remains in the sulfide form. Copper sulphides and other metals interact with sodium sulphide to form a matte-slag melt. Then, a mixture of zinc lead matte and copper iron of the intermediate product is introduced into the melt, while copper,. contained in semi-finished products, you lose iron from the matte, and it, together with the iron contained in the semi-products, displaces lead from the slips and matte into the metal phase. Sulfurous sodium formed at the beginning of smelting reacts with iron and copper sulphides of matte to form thio salts, solubility, of metallic lead which is vital, which leads to more complete removal of lead from copper slips. The use of iron-lead matte and copper-ferrous intermediate. in a ratio of less than 4: 1, it is inefficient due to the fact that the content of substandard matte in the mixture is not enough to form an easily fusible matte-slag melt with the required physicochemical properties; which will lead to loss of lead. Increasing the weight ratio of either iron lead matte and copper-iron semi-product more than 5: 1

Continued table. 2

95-100

0-5

100

TOO

100 leads to a decrease in the recovery of lead in the rough metal, which is explained by an increase in the solubility of lead in mattes with a high content of iron sulfide. The introduction of iron-lead matte and copper-ferrous intermediate product less than 5 into the melt will not lead to the desired results, since the mixture will not be sufficient for lead desulfurization reactions, which will lead to (With loss of lead. Blending the mixture more than 30% also does not give positive results, as an excess of metallic copper in the melt can lead to its dissolution in lead and the formation of spase, which reduces lead extraction.The introduction of a mixture of iron-lead matte and copper-ferrous intermediate in less than 3 hours until the end of the process is irrational, since the main reactions have not been solved, the main mass of lead in the metal phase has not been isolated. Adding a mixture of matte and a copper-non-ferrous intermediate less than 1.5 hours before the end of the melting will lead to incomplete reactions of the components with the melt the accumulation of copper, dissolving it in lead, the formation of spase, and, as a consequence, the reduction of lead extraction ... A portion of the slurries and mixtures with sodium carbonate and carbon-containing reducing agent are loaded into the gradually heated Grigorievich. Upon reaching the required temperature in the reaction zone, the mixture is maintained at a given temperature for a certain time. In the second melting period, a mixture of iron-lead substandard matte and copper-iron intermediate is added to the furnace. After the melting is completed, the melting products are poured out of the furnace.

Experiments were carried out using copper slips of the composition,%: lead 62, copper 6, iron-lead substandard matte composition,%: lead 20, copper 6.5; iron The melting temperature in all experiments, the melting time of 6 hours

The results of the experiments are given in table.3.

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111027252.12

The economic effect from the introduction of the expense of increasing the extraction of lead and cor of the invention will be 368.2 thousand rubles. Cuts in material costs and topn 10,000 tons of recycled slips over the years.

Claims (2)

1. METHOD FOR PROCESSING COPPER SLIPERS, including their smelting with alkali metal salts, carbon-containing reducing agent and iron-containing material, characterized in that, in order to increase lead recovery, a mixture of iron-lead matte is introduced into the melt for 1.5-3 hours before the end of smelting 'of the copper-gland intermediate product with their ratio (4-5): 1 in the amount of 5 ”30% by weight of the slurries. 2. The method of pop. 1, characterized in that, as a copper-iron intermediate, waste material of bimetal composition, wt.?: Copper 7 ^_ 8, iron 92-93 is used. No. Yu SP YU 1027252 2 *