Method for separating valuable metals from copper slag

A valuable metal and copper slag technology, applied in the field of metallurgy, can solve the problems of low degree of automation, increased oxygen production, oxygen supply equipment, low production efficiency of roasting kilns, etc., to improve the metallization rate of pellets and the recovery of metal iron efficiency, reduction in treatment costs, reduction in time and consumption of reducing agents

Inactive Publication Date: 2015-03-11
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

In this method, only fayalite is roasted at low temperature to obtain calcined sand. The obtained calcined sand provides iron-making raw materials for iron and steel enterprises, and its use is not specified. Moreover, the content of magnetic iron in the calcined sand is only 36%. The method cannot effectively enrich the iron element, and the fact is that it cannot be used by the steel industry. At the same time, the powder is roasted in the roasting kiln, and there is a certain filling factor. The production efficiency of this kind of powder roasting kiln is low, and the degree of automation is not high. In addition, , industrial oxygen needs to be introduced during the roasting process, and corresponding oxygen production and oxygen supply equipment need to be added

Method used

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  • Method for separating valuable metals from copper slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Copper slag composition: 39.12wt% TFe, 0.36wt% Cu, 1.53wt% Zn and 0.46wt% Pb;

[0054] Separation step: Use starch solution with 10% weight of copper slag as a binder to mix evenly with copper slag, and then pelletize to obtain copper slag pellets with a particle size of 5mm. Dry the copper slag pellets and send them to the rotary hearth furnace for internal oxidation In a neutral atmosphere, oxidation roasting treatment was carried out at 850 degrees Celsius for 25 minutes to obtain copper slag pellets through oxidation roasting treatment, wherein, the burner fuel of the rotary hearth furnace was natural gas, the air excess coefficient was 1.3, and the furnace was rich in oxygen. The copper slag pellets that have been oxidized and roasted are used as cue balls for pelletizing, and the outside is wrapped with a mixture of reduced coal, limestone and bentonite (the mass ratio of the ingredients of the mixture is reducing agent:limestone:bentonite=100:40:20), and the reduc...

Embodiment 2

[0056] Copper slag composition: with embodiment 1;

[0057]Separation step: Use starch solution with 10% weight of copper slag as a binder to mix evenly with copper slag, and then pelletize to obtain copper slag pellets with a particle size of 5mm. Dry the copper slag pellets and send them to the rotary hearth furnace for internal oxidation Under a neutral atmosphere, oxidize and roast at 700 degrees Celsius for 35 minutes to obtain copper slag pellets that have undergone oxidation and roast. The burner fuel of the rotary hearth furnace is natural gas, the air excess coefficient is 1.5, and the furnace is rich in oxygen. The copper slag pellets that have been oxidized and roasted are used as cue balls for pelletizing, and the outside is wrapped with a mixture of reduced coal, limestone and bentonite (the mass ratio of the ingredients of the mixture is reducing agent:limestone:bentonite=100:40:20), and the reduction The fixed carbon content of the agent is 63wt%, the CaO conten...

Embodiment 3

[0059] Copper slag composition: with embodiment 1;

[0060] Separation step: Use starch solution with 10% weight of copper slag as a binder to mix evenly with copper slag, and then pelletize to obtain copper slag pellets with a particle size of 5mm. Dry the copper slag pellets and send them to the rotary hearth furnace for internal oxidation Under a neutral atmosphere, oxidize and roast at 700 degrees Celsius for 35 minutes to obtain copper slag pellets that have undergone oxidation and roast. The burner fuel of the rotary hearth furnace is natural gas, the air excess coefficient is 2.0, and the furnace is rich in oxygen. The copper slag pellets that have been oxidized and roasted are used as cue balls for pelletizing, and the outside is wrapped with a mixture of reduced coal, limestone and bentonite (the mass ratio of the ingredients of the mixture is reducing agent:limestone:bentonite=100:40:20), and the reduction The fixed carbon content of the agent is 65wt%, the CaO conte...

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Abstract

The invention discloses a method for separating valuable metals from copper slag. The method comprises the steps: (1) performing primary mixing palletizing on the copper slag and an adhesive to obtain copper slag pellets; (2) performing drying treatment on the copper slag pellets; (3) performing oxidation roasting treatment on the dried copper slag pellets so as to convert fayalite in the copper slag into ferric oxide; (4) performing secondary mixing palletizing on the copper slag pellets subjected to oxidization roasting and a mixture containing a reducing agent, an additive and an adhesive to obtain a pellet material; (5) performing reducing roasting on the pellet material so as to obtain reduced pellets and smoke containing zinc oxide and lead oxide; (6) smashing the reduced pellets to obtain a mixture containing metal iron powder and tailings; (7) performing magnetic separation on the mixture containing the metal iron powder and the tailings to respectively obtain the metal iron powder and the tailings. According to the method disclosed by the invention, iron, zinc and lead can be effectively separated from the copper slag, and the grade of obtained metal iron is higher.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method for separating valuable metals from copper slag. Background technique [0002] In recent years, the world's copper production has grown rapidly, and my country's copper production has leapt to the first place in the world. In my country, more than 97% of copper output is produced by pyrometallurgy, and pyrometallurgy occupies a dominant position. Copper pyrometallurgy produces a large amount of high-iron copper slag, which occupies a large amount of land and has a certain impact on the surrounding environment. The iron content of copper slag is between 30% and 40%, which is higher than the grade of iron ore used in domestic industrial beneficiation. Due to the different sources of copper ore, copper slag also contains valuable metal elements such as cobalt, nickel, and zinc. A large amount of copper slag rich in iron and copper is piled up, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/00C22B19/30
CPCY02P10/20
Inventor 吴道洪王敏曹志成任中山王欣薛逊
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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