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System and method for treating copper slag

A technology of copper slag and roasting slag, which is applied in the field of copper slag treatment system, can solve problems such as affecting zinc recovery, limiting the use range of copper slag, narrow product market and difficult to use

Pending Publication Date: 2018-06-12
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The arsenic in the arsenic-containing copper slag will also enter the final iron product through direct reduction treatment, causing the arsenic content in the iron to exceed the standard (the arsenic content is as high as 0.30wt%), making the product market narrow and difficult to utilize
In addition, part of arsenic oxide will volatilize into zinc-containing dust, affecting the recovery of zinc
[0005] The iron-containing products obtained by copper slag through the direct reduction process contain 0.2-0.8wt% copper. When used as raw material for electric furnace steelmaking, copper is an impurity element. In the process of steelmaking and refining, copper exists as a harmful element. Compounds with low melting points are formed and aggregated on the grain boundaries, resulting in hot embrittlement of the steel, thus limiting the scope of use of copper slag
Taking high-quality carbon steel as an example, the copper content is generally required to be less than 0.25wt%, so this copper-containing iron product can only be sold as an ingredient or at a discount

Method used

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  • System and method for treating copper slag

Examples

Experimental program
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Effect test

Embodiment 1

[0105] Copper slag (TFe content 45wt%, SiO 2 content of 30wt%, As content of 0.3wt%, Cu content of 0.8wt%) for oxidative dearsenic roasting treatment, the specific conditions are: no additives, oxygen volume concentration 3%, the rest is nitrogen, roasting temperature 700 ° C, roasting time 90min . The low-arsenic roasted slag and the first arsenic-containing flue gas are obtained after the reaction. The As content of the low-arsenic roasted slag is 0.15wt%, and the iron mainly exists in the form of ferric oxide, which accounts for 99% of the total iron. The low-arsenic roasting slag, reduced coal and bentonite were mixed and molded at a mass ratio of 100:10:3 to obtain mixed pellets, which were magnetized and roasted in a rotary hearth furnace at a reduction temperature of 850°C for 30 minutes. After the magnetization roasting, the magnetized roasting slag and the second arsenic-containing flue gas are obtained. The iron in the magnetized roasting slag mainly exists in the f...

Embodiment 2

[0107] Copper slag (TFe content 35wt%, SiO 2 content of 33wt%, As content of 0.1wt%, Cu content of 0.2wt%) for oxidative dearsenization roasting treatment, the specific conditions are: no additives, oxygen volume concentration 6%, the rest is nitrogen, roasting temperature 900 ° C, roasting time 30min . After the reaction, the low-arsenic roasted slag and the first arsenic-containing flue gas are obtained. The As content of the low-arsenic roasted slag is 0.05 wt%, and the iron mainly exists in the form of ferric oxide, which accounts for 98.5% of the total iron. The low-arsenic roasting slag, reduced coal and bentonite were mixed and molded at a mass ratio of 100:5:1 to obtain mixed pellets, which were magnetized and roasted in a rotary hearth furnace at a reduction temperature of 750°C for 60 minutes. After the magnetization roasting, the magnetized roasting slag and the second arsenic-containing flue gas are obtained. The iron in the magnetized roasting slag mainly exists ...

Embodiment 3

[0109] Copper slag (TFe content 40wt%, SiO 2 content of 32wt%, As content of 0.15wt%, Cu content of 0.4wt%) for oxidative dearsenization roasting treatment, the specific conditions are: no additives, oxygen volume concentration 3%, the rest is nitrogen, roasting temperature 800 ° C, roasting time 60min . After the reaction, the low-arsenic roasted slag and the first arsenic-containing flue gas are obtained. The As content of the low-arsenic roasted slag is 0.08wt%, and the iron mainly exists in the form of ferric oxide, which accounts for 98.2% of the total iron. The low-arsenic roasting slag, reduced coal and bentonite were mixed and molded at a mass ratio of 100:8:2 to obtain mixed pellets, which were magnetized and roasted in a rotary hearth furnace at a reduction temperature of 800°C for 45 minutes. After the magnetization roasting, the magnetized roasting slag and the second arsenic-containing flue gas are obtained. The iron in the magnetized roasting slag mainly exists ...

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Abstract

The invention discloses a system and method for treating copper slag. The system comprises an oxidization dearsenification baking device, a mixing forming device, a magnetic baking device and a grinding separation magnetic separation device. The oxidization dearsenification baking device is provided with a copper slag inlet, an oxygen inlet, a low-arsenic baking slag outlet and a first arsenic containing smoke outlet; the mixing forming device is provided with a low-arsenic baking slag inlet, a reduction coal inlet, a bonding agent inlet and a mixing pellet outlet, the low-arsenic baking slaginlet is connected with the low-arsenic baking slag outlet, the magnetic baking device is provided with a mixing pellet inlet, a magnetic baking slag outlet and a second arsenic containing smoke outlet; the mixing pellet inlet is connected with the mixing pellet outlet; the grinding separation magnetic separation device is provided with a magnetic baking slag inlet, an iron concentrate outlet anda copper containing tailing outlet; the magnetic baking slag inlet is connected with the magnetic baking slag outlet. Through the system, copper slag dearsenification, and copper and zinc-contained powder dearsenification can be achieved, and the iron concentrate and zinc-contained powder added value can be obviously improved.

Description

technical field [0001] The invention belongs to the field of metallurgical solid waste treatment, in particular, the invention relates to a system and method for treating copper slag. Background technique [0002] Copper slag is the tailing slag produced in the copper smelting process. When 1 ton of refined copper is smelted, 2.2 tons of copper slag will be produced at the same time. The output of copper smelting furnace slag in my country is large, with an annual output of about 1.5 million tons. A large amount of copper slag accumulation will cause serious water pollution and soil pollution, so it is very important to strengthen the comprehensive utilization of copper slag. The main components of copper slag are iron oxide and silicon dioxide, and the main phase is fayalite and a small amount of magnetite. [0003] At present, the research on the utilization of copper slag mainly focuses on the extraction of valuable metals iron, zinc and lead in copper slag. The methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B03C1/015C22B7/04C22B19/30C22B30/04
CPCB03C1/015C22B1/02C22B7/04C22B19/30C22B30/04Y02P10/20
Inventor 吴道洪宋文臣王静静李红科曹志成汪勤亚
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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