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Copper-smelting thermal slag iron-extracting process and device

A technology of copper smelting and slag, which is applied in the field of copper smelting hot slag iron extraction process and equipment, can solve the problems of waste of iron resources, energy waste, and non-recycling of iron, so as to save energy and cost, save equipment investment and land occupation area effect

Active Publication Date: 2010-05-12
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the two treatment methods of hot furnace slag in copper smelting are: first, the heat of hot furnace slag is not utilized, resulting in energy waste; second, the iron in the slag is not recovered, resulting in a great waste of iron resources

Method used

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  • Copper-smelting thermal slag iron-extracting process and device
  • Copper-smelting thermal slag iron-extracting process and device
  • Copper-smelting thermal slag iron-extracting process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 Among them, it includes a furnace body, which divides the interior of the furnace body into two areas with upper and lower retaining walls: the first molten pool 14 is the copper-depleted area and the second molten pool 15 is the iron reduction area; 14 is provided with a hot copper slag feed port 1 and a matte discharge port 10, and a nitrogen pipe 2, a fuel burner 4, an electrode 3 and a solid feed port 16 are provided on the top of the first molten pool 14; in the second molten pool 15 An oxygen port 8 and a nozzle port 13 are provided, a solvent feed port 17 is provided at the top, a slag discharge port 11 is provided at the side, and a molten iron discharge port 9 is provided at the bottom. The second molten pool 15 communicates with the flue 12 .

[0035] The flue gas areas of the two melting pools are connected, and the heat of the flue gas in the reduction area and the depletion area can complement each other.

[0036] The lower retaining wall in cont...

Embodiment 2

[0039] figure 2 Among them, it includes a furnace body, which divides the interior of the furnace body into two areas with upper and lower retaining walls: the first molten pool 14 is the copper-depleted area and the second molten pool 15 is the iron reduction area; 14 is provided with a hot copper slag feed port 1 and a matte discharge port 10, and a nitrogen pipe 2, a fuel burner 4, an electrode 3 and a solid feed port 16 are provided on the top of the first molten pool 14; in the second molten pool 15 An oxygen port 8 is provided, a solvent feed port 17 and a spray gun 7 are provided on the top, industrial oxygen and oxygen-enriched air, coal powder and quicklime are sprayed out from the spray gun 7, and a slag discharge port 11 is provided on the side of the second molten pool 15, The lower part is provided with a molten iron discharge port 9; the second molten pool 15 communicates with the flue 12.

[0040] The flue gas areas of the two melting pools are connected, and ...

Embodiment 3

[0044] In the present invention, during the whole smelting process, copper smelting hot slag is depleted to extract copper and iron is reduced in the same furnace, and copper is extracted in the first molten pool, that is, the copper depleted area, and the electrode arc or fuel is used to provide heat energy , stirring with nitrogen to make the fine matte particles collide and grow, and realize sedimentation and separation. The depleted slag automatically flows into the second melting pool, which is the iron reduction zone, and coal, quicklime, and oxygen-enriched air are injected into the iron by side blowing or top blowing method to achieve reduction and iron extraction.

[0045] Industrial oxygen is sprayed into the liquid surface of the second molten pool to realize the secondary combustion of CO, and the combustion heat is absorbed by the splashed slag through conduction and radiation and brought into the melt to maintain the heat balance of the melt.

[0046] The melt te...

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Abstract

The invention discloses a copper-smelting thermal slag iron-extracting process and a device. The copper-smelting thermal slag is processed in a same furnace to deplete copper and reduce iron. The copper extraction is performed in a first furnace hearth (copper depleting area). Electrode arc or fuel is used for supplying heat. Small matte particle is impacted to grow up by stirring with nitrogen to realize settlement separation. The depleted slag automatically flows into a second furnace hearth (iron reducing area). Coal, quicklime and oxygen-enriched air are blown in from side or top to reduce iron. The invention has the advantages that copper and iron are sufficiently recycled from the copper-smelting slag, the recycling rate of copper is more than 90%, the recycling rate of iron is more than 95%, heat of thermal slag is sufficiently used, the energy source and the cost are saved, the copper extraction and the iron extraction are realized in a same furnace, and the equipment investment and the floor space are both saved.

Description

technical field [0001] The invention relates to the technical field of copper and iron and steel metallurgy, in particular to a process and device for extracting iron from copper smelting hot slag. Background technique [0002] At present, the hot slag produced by various copper smelting methods contains more than 0.6% Cu and more than 40% Fe. At present, the focus of copper smelting slag recovery in the world is on the recovery of copper, and there is no recovery of iron in the slag. There are two main ways to recover copper from slag: the first is to reduce the Cu content in hot slag to less than 0.3% by various methods, and then water quenching to produce fine-grained black sand, which is used for anti-corrosion sand blasting and rust removal or discarded; The second method is to recover the copper in the slag by beneficiation after slow cooling of the hot slag, and discard the tailings containing Cu less than 0.30% produced after the beneficiation. The main disadvantage...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B15/00C21B11/00
CPCY02P10/20
Inventor 周松林
Owner YANGGU XIANGGUANG COPPER
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