RU2104794C1 - Method of isolating copper from slags when smelting copper-manganese foundry alloy in induction furnaces - Google Patents

Abstract

FIELD: nonferrous metallurgy. SUBSTANCE: method consists in self-rubbing of slags on self-grinding mill followed by separation of copper-containing product from rubbed off rock constituent of slags less than 1 mm in size or 2 mm on grating. EFFECT: enhanced efficiency of process. 1 dwg, 1 tbl

Description

 The invention relates to the metallurgy of non-ferrous metals and can be used in factories producing copper, copper-containing alloys for the separation of copper from slags, in particular, from slags obtained by smelting copper-manganese ligatures in induction furnaces.

 A known method of separating copper from slag, including grinding slag and processing the crushed slag acid [1].

 The known method is not used for the separation of copper from slag obtained by smelting ligatures "copper-manganese" in induction furnaces. In addition, this method does not provide high copper recovery.

 A known method of separating copper from copper-containing slag, including grinding the slag and the selection of copper by screening [2].

 This method is also not intended for slags obtained by smelting copper-manganese ligatures in induction furnaces. In addition, the method does not allow to obtain a high-quality copper product.

 The objective of the invention is the extraction of copper from slag obtained by smelting ligatures "copper-manganese" in induction furnaces. EFFECT: obtaining a high-quality copper-containing product.

 The technical result is achieved by the fact that the slag obtained by smelting the copper-manganese ligature in induction furnaces is subjected to self-abrasion in a self-grinding mill, followed by separation of the copper-containing product from the rubbed rock component of the slag with a grain size of less than 1 mm or 2 mm on a screen.

 Self-grinding mills are used, in which all slags are loaded in their entirety without preliminary screening, given that all pieces have smears of the rock.

 In a self-grinding mill, inter-abrasion of all slag particles located in a rotating drum occurs.

 The study of the structure of slags showed that for a sufficiently complete removal of the rock component it is not necessary to significantly crush and grind copper-containing pieces and ligature particles to a smaller size. Since the rock is concentrated mainly on the surface of pieces and particles of slag formed during smelting, intensive abrasion of the particle surface is sufficient, which is realized in self-grinding mills of the Cascade or ore-pebble type. The dimensions of the holes in the grill of the mill are taken to be sufficient for passing pieces of the maximum size (80 mm) through the grill.

 The size of pieces and particles of slag rubbed off the surface does not exceed 1 mm. Therefore, to remove them, it is necessary to provide for screening of the product that has left the mill over a grain of 1 mm.

 The essence of the invention is illustrated by the drawing, which shows the technological scheme of the proposed method.

 The method is as follows. The initial slag goes to a self-grinding mill, in which the required degree of purification of their surface from the rock component is achieved, then the product coming out of the mill is screened on a 1 mm sieve, while the particle size class +1 mm is a copper-containing product purified from rock, and the particle size class -1 + About mm goes to waste.

 Self-grinding experiments were carried out on slag smelting from copper-manganese ligatures in a mill measuring D x L = 420 x 445 mm. Pieces of ligature slag with a size of 50-100 mm were loaded into the mill, providing a fill factor of 0.35, the rotational speed of the drum was 0.8, and the specific energy consumption was 12 kWh / t. A sieve analysis of the crushed product showed that the purified pieces of the copper-manganese alloy were concentrated in the +1 mm fraction, and the rock slag component in the fraction was 1 + O mm.

 The results are shown in the table.

 The results obtained indicate that the use of self-grinding and subsequent separation by screening of crushed rock constituent slags achieves a high cleaning effect of pieces of copper-manganese alloy.

Claims (1)

 A method for separating copper from slags obtained by smelting copper-manganese alloys in induction furnaces, characterized in that it includes self-abrasion of slags in a self-grinding mill, followed by separation of the copper-containing product from the rubbed rock component of slags with a particle size of less than 1 mm or 2 mm on a screen.

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