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Process for recovery of iron from copper slag

Inactive Publication Date: 2007-12-13
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] iv. inducting the mixture obtained in step (ii) in the molten metal pool at a slow rate so that vigorous reaction can be avoided,
[0027] Thus, the problems mentioned in the prior art are largely overcome, and the efficiency of reduction of the slags substantially improved. This procedure has been found to optimize utilization of the reductant by allowing its dispersion and dissolution in the molten metal bath before contacting and reacting with the molten slag at the molten metal-molten slag interface.
[0028] Novelty of the present invention is process for the preparation of value added products viz grinding grade cast iron using copper slag generated during the processing of copper concentrate which otherwise is considered as a waste. Other novel features of the inventions are creating a homogeneous mixture of slag, reductant and flux so that reaction kinetics is more than conventional process. The reductant is used in such a way so that maximum recovery of iron can take place.

Problems solved by technology

Unsystematic disposal / dumping of these wastes may lead to environmental degradation and therefore, presently the reuse or recycling of the waste is often stressed upon.
Here the disadvantage is loss of the major metal values and the process id uneconomical with respect to the recovery of copper and cobalt.
These above processes have, however, generally been relatively inefficient due to the difficulty of obtaining effective contact, i.e., wetting, between molten oxides, contained in molten slag, and solid reductants such as carbon.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example-1

[0030] The granulated copper slag containing Cu(weight %): 0.523, Silica(weight %): 30.1, Lime(weight %): 3.8, Fe(weight %): 42.8, Cd(ppm): 0.003, Co(ppm): 5.6, Ni(ppm): 0.58, Pb(ppm): 10.9 was selected from the copper slag generated during the processing of copper containing concentrate from a copper producing industry. 10 kg of granulated copper slag of size range 5 to 10 mm, lime of amount 2.5 kg and graphite powder of amount 0.6 kg was mixed in a muller for two minutes. 5 kg of pig iron was melted in direct arc furnace. In the molten pool, 0.2 kg of graphite was added. Then the copper slag mixture was added slowly into the molten pool. The melt temperature was maintained at 1370 to 1390° C. and the reduction time was around 1 h. After complete melting, the slag was skimmed off from the furnace and the melt was tapped to a ladle and finally poured in moulds as well as in standard test blocks. Recovery of iron from the slag was about 85 weight %.

example-2

[0031] The granulated copper slag containing Cu(weight %): 0.523, Silica(weight %): 30.1, Lime(weight %): 3.8, Fe(weight %): 42.8, Cd(ppm): 0.003, Co(ppm): 5.6, Ni(ppm): 0.58, Pb(ppm): 10.9 was selected from the copper slag generated during the processing of copper containing concentrate from a copper producing industry. 15 kg of granulated copper slag of size range 10 to 15 mm, lime of amount 3.0 kg and petroleum coke of amount 1.0 kg was mixed in a muller for three min. 4 kg of cast iron having carbon content 3.2 weight % was melted in direct arc furnace. 0.5 kg of petroleum coke was added initially in the bath to which the copper slag mixture was added slowly. During melting 0.3 kg petroleum coke was used for sprinkling to calm down the foam formation. The melt temperature was maintained at 1370 to 1390° C. and the reduction time was around 1.5 h. The melt tapping and pouring were same as in example one. The powder consumption for this operation was 50 kWh. The casting so obtaine...

example-3

[0032] The copper slag containing Cu(weight %): 0.227, Silica(weight %): 30.9, Lime(weight %) 0.41, Fe(weight %): 36.89, Cd(ppm): 0.003, Co(ppm): 2.72, Ni(ppm): 0.37, Pb(ppm): 5.17 was selected from the copper slag generated during the processing of copper containing concentrate from a copper producing industry. 10 kg of copper slag of size range 5 to 10 mm, lime of amount 3.0 kg and graphite powder of amount 0.5 kg was mixed in a muller for two min. 4 kg of pig iron was melted in direct arc furnace. In the molten pool 0.3 kg of graphite was added. Then the copper slag mixture was added slowly into the molten pool. The melt temperature was maintained at 1390 to 1420° C. and the reduction time was around 1 h. After complete melting the slag was skimmed off from the furnace and the melt was tapped to a ladle and finally poured in moulds as well as in standard test blocks. Recovery of iron from the slag was about 75 weight %. Power consumption was found to be 40 kWh.

[0033] The main ad...

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Abstract

The present invention relates to a process for recovery of iron from copper slag. This invention particularly relates to a process for recovery of iron from a waste like granulated copper slag generated during the production of copper from its ores by a pyrometallurgical method. The present invention will be useful for solving the ecological and environmental issues with an added economic advantage of utilising the dump slag generated in the copper plants. Novelty of the present invention is process for the preparation of value added products viz grinding grade cast iron using copper slag generated during the processing of copper concentrate which otherwise is considered as a waste. Other novel features of the inventions are creating a homogeneous mixture of slag, reductant and flux so that reaction kinetics is more than conventional process. The reductant is used in such a way so that maximum recovery of iron can take place.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a process for recovery of iron from copper slag. This invention particularly relates to a process for recovery of iron from a waste like granulated copper slag generated during the production of copper from its ores by a pyrometallurgical method. The present invention will be useful for solving the ecological and environmental issues with an added economic advantage of utilising the dump slag generated in the copper plants. BACKGROUND OF THE INVENTION [0002] Generation of waste (solid / liquid / gases) in varying amounts is a part of almost every metal casting industry. These wastes can be converted to wealth if processed for eventual recovery of valuables provided it is economical. Unsystematic disposal / dumping of these wastes may lead to environmental degradation and therefore, presently the reuse or recycling of the waste is often stressed upon. Copper smelter slag generated during the processing of copper concentrate for...

Claims

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Application Information

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IPC IPC(8): C22B15/00
CPCC21B3/06C21B13/0013C21B13/12C22B15/0054C22B5/10C22B7/04C21C2300/04C21B2400/02Y02W30/50Y02P10/134Y02P10/20C21B13/00C22B15/00
Inventor AGRAWAL, ARCHANASAHOO, KANAI LALGHOSH, SUKOMALPANDEY, BANSHI DHAR
Owner COUNCIL OF SCI & IND RES
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