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Copper anode slime smelting slag treatment method for prolonging service life of Kaldo furnace

A technology of copper anode slime and treatment method, applied in the direction of improving process efficiency, etc., can solve problems affecting the operation rate of Kaldor furnace, etc., achieve good economic benefits, prolong service life, and improve use efficiency

Active Publication Date: 2021-07-09
紫金铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bricks of the Kaldor furnace cost more than 400,000 yuan. It takes 3-5 days to replace the bricks on the premise of having a spare furnace shell (about 10 days to replace the bricks without a spare furnace shell), and the frequent replacement of furnace bricks also affects Kaldor. Furnace operating rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Prepare 1 ton of copper anode slime smelting slag, crush it to a particle size of 20mm, and then add it to the Kaldor furnace. Add flux calcium oxide, reducing agent iron powder and coke powder according to the amount of smelting slag added. Smelting slag: calcium oxide: iron powder: coke powder = 100:9:4:6, the reduction smelting temperature is controlled at 1100°C, and the reaction time is about 1h.

[0021] After the reduction smelting is completed, the Kaldor furnace stops rotating, and the reduced smelting slag is left to stand for about 0.5h. Due to the difference in density, the reduced smelting slag has obvious stratification.

[0022] Air-cool the Caldo furnace to cool down from 1100°C to 800°C. At the same time, add 20kg of calcium oxide to the slag surface of the viscous slag, and make slag again. Solid slag precipitates on the slag surface and gradually forms crusted slag. Still in the molten state, the alloying operation is carried out to discharge the lead...

Embodiment 2

[0025] Prepare 2t of copper anode slime smelting slag, crush it to a particle size of 30mm, and then add it to the Kaldor furnace. Add flux calcium oxide, reducing agent iron powder and coke powder according to the amount of smelting slag added. Smelting slag: calcium oxide: iron powder: coke powder = 100:10:3:7, the reduction melting temperature is controlled at 1050°C, and the reaction time is about 1h.

[0026] After the reduction smelting is completed, the Kaldor furnace stops rotating, and the reduced smelting slag is left to stand for about 0.5h. Due to the difference in density, the reduced smelting slag has obvious stratification.

[0027] Air-cool the Kaldor furnace to 850°C. At the same time, add 40kg of calcium oxide to the slag surface of the viscous slag, and make slag again. Solid slag precipitates on the slag surface and gradually forms crusted slag, and the lead-bismuth alloy is still in a molten state. , carry out the alloying operation to discharge the lead-b...

Embodiment 3

[0030] Prepare 2t of copper anode slime smelting slag, crush it to a particle size of 10mm, and add it to the Kaldor furnace. Add flux calcium oxide, reducing agent iron powder and coke powder according to the amount of smelting slag added. Smelting slag: calcium oxide: iron powder: coke powder = 100:14:6:8, the reduction smelting temperature is controlled at 1000°C, and the reaction time is about 1h.

[0031] After the reduction smelting is completed, the Kaldor furnace stops rotating, and the reduced smelting slag is left to stand for about 0.5h. Due to the difference in density, the reduced smelting slag has obvious stratification.

[0032] Air-cool the Kaldor furnace to 900°C. At the same time, add 50kg of calcium oxide to the slag surface to make slag again. Solid slag precipitates on the slag surface and gradually forms crusted slag. The lead-bismuth alloy is still in a molten state, and the alloy is produced. The lead-bismuth alloy is discharged from the operation, and ...

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Abstract

The invention discloses a copper anode slime smelting slag treatment method for prolonging the service life of a Kaldo furnace. By selecting calcium oxide as a flux, layered deslagging can be performed after reduction smelting is finished, then a slagging shell is cooled, a lead-bismuth alloy is discharged, crusting slag is left in the Kaldo furnace, temperature rises for the slag shell wall hanging operation, so that a compact slag layer is formed on the furnace wall of the Kaldo furnace, and the Kaldo furnace can be protected. When the method is used for treating the copper anode slime smelting slag, the number of days of one-furnace-period operation of the Kaldo furnace can reach 360 days, the slag treatment amount can reach 3500 tons, the service life of the Kaldo furnace is greatly prolonged, the treatment amount is increased, the consumption of furnace bricks is reduced, the use efficiency of the Kaldo furnace is improved, and good economic benefits are obtained.

Description

technical field [0001] The invention relates to the technical field of copper anode slime smelting slag treatment, in particular to a copper anode slime smelting slag treatment method for improving the service life of a Kaldor furnace. Background technique [0002] The Kaldor furnace is widely used in the treatment of copper anode slime due to its strong adaptability of raw materials, large processing capacity and high degree of automation. A certain amount of smelting slag is produced during the copper anode slime fire treatment process. The smelting slag contains a small amount of gold and silver and a large amount of lead and bismuth. The traditional smelting slag treatment method is to return it to the copper smelting system or sell it to the lead smelter. Some enterprises Recycled using wet process. In order to improve the recovery value of gold, silver, lead, and bismuth, domestic copper anode slime processing enterprises gradually use the Caldo furnace to process cop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/02C22B13/02C22B30/06
CPCC22B7/04C22B7/004C22B13/025C22B30/06C22B11/023Y02P10/20
Inventor 张永锋陈一恒王树昆邱发强
Owner 紫金铜业有限公司
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