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Treatment method for converting sulfur-containing blister copper furnace slag through Kaldo furnace

A treatment method and technology of slag, which is applied in the field of processing sulfur-containing blister copper slag in Kaldor furnace, can solve the problems of difficult control of production process, large disturbance of production system, and large metal loss, etc., and achieve the improvement of technical and economic indicators of operation, Process control optimization, the effect of improving production efficiency

Inactive Publication Date: 2020-10-16
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The produced slag is a desulfurized high-grade oxide slag with high copper content and low nickel content, in which the Ni+Cu grade reaches about 35.0-60.0%, and contains a certain amount of precious metals such as gold and silver. A large amount of land also affects the surrounding ecological environment, resulting in a serious waste of economic resources
[0004] According to the different raw material conditions and smelting process, at present, a small amount of Kaldor furnace slag is added to the converter and top-blown furnace for processing, which has the disadvantages of large disturbance to the normal production system, more metal losses such as nickel and copper, and the production process is difficult to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Mix the cold Kaldor furnace slag with particle size less than 5mm, reducing agent and calcareous flux evenly, then feed it into the DC electric arc furnace through the feeding port, and heat it up to 1500°C to form a molten slag pool.

[0031] 2. The Ni+Cu grade of Kaldor furnace slag is 48.0%, the adding amount of reducing agent granular coal is 10%, and the adding amount of flux limestone is 17%.

[0032] 3. The molten slag pool was reduced and smelted at 1500°C for 50 minutes.

[0033] 4. After the holding time is over, liquid metal and tailings are discharged respectively to obtain copper-nickel alloy.

[0034] 5. The Ni+Cu grade of the produced copper-nickel alloy is 94.5%, the recovery rate of Ni is 99.0%, and the recovery rate of Cu is 98.5%.

Embodiment 2

[0036] 1. Mix the cold Kaldor furnace slag with particle size less than 5mm, reducing agent and calcareous flux evenly, then feed it into the DC electric arc furnace through the feeding port, and heat it up to 1500°C to form a molten slag pool.

[0037] 2. The Ni+Cu grade of Kaldor furnace slag is 48.0%, the addition amount of reducing agent granular coal is 14%, and the addition amount of flux limestone is 25%.

[0038] 3. The molten slag pool was reduced and smelted at 1500°C for 50 minutes.

[0039] 4. After the holding time is over, liquid metal and tailings are discharged respectively to obtain copper-nickel alloy.

[0040] 5. The Ni+Cu grade of the produced copper-nickel alloy is 95.8%, the recovery rate of Ni is 98.6%, and the recovery rate of Cu is 99.2%.

Embodiment 3

[0042] 1. Mix the cold Kaldor furnace slag with particle size less than 5mm, reducing agent and calcareous flux evenly, then feed it into the DC electric arc furnace through the feeding port, and heat it up to 1500°C to form a molten slag pool.

[0043] 2. The Ni+Cu grade of Kaldor furnace slag is 48.0%, the addition amount of reducing agent granular coal is 18%, and the addition amount of flux limestone is 30%.

[0044] 3. The molten slag pool was reduced and smelted at 1500°C for 50 minutes.

[0045] 4. After the holding time is over, liquid metal and tailings are discharged respectively to obtain copper-nickel alloy.

[0046] 5. The Ni+Cu grade of the produced copper-nickel alloy is 96.1%, the recovery rate of Ni is 99.2%, and the recovery rate of Cu is 98.5%.

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Abstract

The invention discloses a treatment method for converting sulfur-containing blister copper furnace slag through a Kaldo furnace, and relates to a comprehensive treatment method for recycling valuablemetals from nickel-copper smelting slag. The method is characterized in that the Kaldo furnace slag is treated through a direct-current electric arc furnace; and the method comprises the following steps of carrying out reduction smelting on furnace slag generated by converting sulfur-containing crude copper in a Kaldo furnace in the direct-current electric arc furnace to obtain liquid copper-nickel alloy and tailings. According to the treatment method, a direct-current electric arc furnace process is adopted, and a reducing agent and a calcium flux are added for reduction smelting, so that thecopper-nickel alloy is obtained, meanwhile, the production cost is reduced, the environmental pollution is reduced, and the production efficiency is improved. The high-grade copper-nickel alloy is prepared through smelting, the atomized copper-nickel alloy is subjected to wet treatment, or the copper-nickel alloy is used as an intermediate material to produce a cupronickel product after impurityremoval, so that the technological process control is greatly optimized, and the operation technical and economic indexes of a system are effectively improved.

Description

technical field [0001] The invention discloses a treatment method for sulfur-containing blister copper slag blowing in a Kaldor furnace, and relates to a comprehensive treatment method for recovering valuable metals from nickel-copper smelting slag. Background technique [0002] At present, when the Kaldor furnace is used to process sulfur-containing blister copper in the production of copper and nickel, the purpose of the Kaldor furnace blowing is to oxidize and remove nickel, iron, sulfur and some other impurities in the sulfur-containing blister copper. [0003] Kaldor furnace blowing is a periodic operation, and each cycle is divided into two stages, namely, the slag-making period and the copper-making period. The whole cycle is completed by spraying high-pressure industrial oxygen into the melt through the oxygen lance nozzle. Due to the strong stirring of the injected air flow and the uniform rotation of the furnace body itself, the melt is tumbling to achieve the ful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22C1/02C22B4/06C22B15/00C22B23/02
CPCC22B4/06C22B7/001C22B7/04C22B15/0056C22B23/02C22C1/02Y02P10/20
Inventor 马晓东吕清华张鹏邓民晖马永峰郑江华徐文芳迟刚姜海燕昝斌
Owner JINCHUAN GROUP LIMITED
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