Dalmia - Slag Cleaning
Slag Cleaning Furnace In this furnace, copper rich oxide slags are melted in electric arc furnaces and coke & copper pyrite are added to reduce copper content in the slag. In order to increase reaction rate, slag is over-heated to produce low viscosity aggressive slag.
MECHANISM OF BUILDUP FORMATION IN AN ELECTRIC …
The copper slag cleaning in an electric furnace is based on slag reduction and settling of copper matte inclusions. Copper recovery depends on the slag temperature, degree of magnetite reduction and slag residence time. The formation of solid buildup on the furnace hearth leads to the decrease of furnace volume and slag residence time, affecting copper recovery and furnace capacity.
12.3 Primary Copper Smelting
Slag produced by flash furnace operations contains significantly higher amounts of copper than reverberatory or electric furnaces. Flash furnace slag is treated in a slag cleaning furnace with coke or iron sulfide. Because copper has a higher affinity for sulfur than oxygen, the copper in the slag (as copper oxide) is converted to copper sulfide.
copper slag cleaning furnace - dynodynamics.be
In a first furnace, slag was molten in a chamber by means of a natural gas burner. Then the slag was tapped continuously into the DC-channel type slag cleaning unit. The first results exceeded SMS Demags and UDC expectations. Occasionally the copper content in the slag could be reduced down to . 0,4% (depending on the original slag copper content).
Slag cleaning: The chilean copper smelter experience ...
Chile has seven copper smelters, four that are linked to primary producers (three owned by Codelco and one by Disputada) and three custom smelters (two owned by Enami and one by Noranda). Each smelter employs a different strategy for slag cleaning, thus each smelter obtains different results.
Influence of slag composition on reduction control and ...
first electric furnace (20 MVA), called the SCF (slag-cleaning furnace), copper oxide is reduced to produce blister copper (98.25% Cu) and slag containing 3 to 5% Cu, 0.78% Co.
Rectangular furnace design and revolutionary DC-slag ...
Copper Slag cleaning furnaces are commonly connected to copper smelting units such as Teniente and Noranda converters and Outokumpu flash smelters. The main function of the furnace is the reduction of the copper level in the slag11. SMS Demag’s furnaces are designed for a reduction of the copper level from 1–8 % down to 0.6– 0.9%.
Minimization of Copper Losses in Copper Smelting Slag ...
Sep 21, 2012 · The electric furnace or rotary slag-cleaning furnace are now generally used to perform this task, giving a level of copper in discard slag typically in the range of 0.55 wt.% and 1.3 wt.%, with most plants reporting copper losses in the discard slag in the range of 0.8–1.0 wt.%.
Recovery of cobalt, nickel, and copper from slags, using ...
In the slag-cleaning process considered here, the furnace would be operated with a layer of electrically conductive coke or coal covering the slag. As the electrodes of the AC furnace penetrate this layer, there exists the possibility of the current flowing between the electrodes on the surface of the slag.
Physical chemistry of copper smelting slags and copper ...
Physical chemistry of copper smelting slags ... and from the slag cleaning electrical furnace (EF) at the Paipote smelter in Chile. ... copper smelting, slag cleaning, copper losses, thermodynamics
Reduction of copper smelting slag using waste cooking oil ...
Nov 01, 2019 · Copper slag cleaning in an electric furnace is a critical process for reducing the excessive magnetite (Fe 3 O 4) present in the copper slag to decrease the slag viscosity, which can promote the sedimentation of matte/copper in the slag, thus reducing the copper content of slag. In this study, laboratory-scale experiments were performed for copper slag cleaning using WCO as a reductant …
Characteristics and utilisation of copper slag—a review ...
Copper slag has been carbothermally smelted in a submerged electric arc furnace, partially reducing FeO to a metallic phase comprising of copper and other metals by Acma et al. (1992). The metallic phase has been transformed to the granules by passing through an air jet.
ISASMELT - Wikipedia
The ISASMELT furnace. An ISASMELT furnace is an upright-cylindrical shaped steel vessel that is lined with refractory bricks. There is a molten bath of slag, matte or metal (depending on the application) at the bottom of the furnace.
Solar cogeneration for copper smelting (Conference) | OSTI.GOV
@article{osti_5689307, title = {Solar cogeneration for copper smelting}, author = {Curto, P. and Gillespie, A.}, abstractNote = {Work is reported on designing a system for solar repowering of a cogenerating flash smelting furnace that produces copper and sulfuric acid. Smelter energy requirements are listed and the proposed project is described.
Flash smelting process - Inco Limited
Oct 07, 1986 · Calcine 18 is then fed along with (100-X) % concentrate 11 into flash furnace 21 in a stream of oxygen 22. Flash smelting takes place autogenously in flash furnace 21 at a temperature of at least about 1350° C. to produce a lime ferrite slag 23, semi-blister copper …
Overview of foreign nonferrous smelter technology
----- sent to the converting furnace. Average copper loss in this waste slag is about 0.4 percent. With lances that introduce blow air, the converting furnace oxidizes the matte to blister copper, which is continuously tapped from the furnace. Slag formed during the converting stage is recycled to the smelting furnace by a moving bucket system.
HIGH PRODUCTIVITY CLEAN SMELTING
including primary and secondary copper smelting and copper converting, primary and secondary lead smelting, primary nickel smelting and converting, and tin, zinc and precious metals smelting. The high intensity of the ISASMELT™ process results in high productivity from . …
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