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Oxygen-enriched bottom blowing one-step copper smelting method

An oxygen-enriching and copper-smelting technology, applied in crucible furnaces, electric furnaces, rotary drum furnaces, etc., can solve the problems of increased slag viscosity, easy to cause foaming slag, and reduced fluidity.

Pending Publication Date: 2022-07-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing one-step copper smelting process, due to the need to directly oxidize the copper sulfide in the ore directly into blister copper, this leads to the partial pressure of oxygen in the smelting process P(O 2 ) is controlled at a relatively high level, and the high oxygen potential makes Fe 3 o 4 Precipitation from slag, resulting in increased viscosity of molten slag, reduced fluidity, and easy to cause foamy slag

Method used

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  • Oxygen-enriched bottom blowing one-step copper smelting method
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  • Oxygen-enriched bottom blowing one-step copper smelting method

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Experimental program
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Effect test

Embodiment 1

[0073] The copper concentrate includes the following components by weight: Cu 40.66%, Fe 18.82%, S 30.56%, SiO 2 0.61%, CaO 7.58%, MgO 0.35%, Al 2 O 3 0.54%; CaO / Fe=0.4, the particle size is 0.15mm, and the moisture content is 7%.

[0074] Flux: CaO, particle size is 0.15mm, moisture content is 7%

[0075] Fuel: pulverized coal, particle size is 0.15mm, moisture content is 7%.

[0076] The mass ratio of copper concentrate and flux is 100:6.4; the mass ratio of copper concentrate and fuel is 100:2.02.

[0077] Slag type: calcium iron slag.

[0078] After mixing the above-mentioned copper concentrate, flux and fuel, they are continuously put into the melting pool of the bottom blowing furnace by the conveyor belt, and the oxygen-enriched air with an oxygen volume content of 60% is injected through the spray gun at the bottom of the bottom-blowing furnace, and the oxygen-enriched air is regulated by frequency conversion according to formula 1. The flow rate of the air, the ...

Embodiment 2

[0081] The copper concentrate includes the following components by weight: Cu 45.48%, Fe 10.82%, S 19.23%, SiO 2 18.06%, CaO 1.51%, MgO 0.47%, Al 2 O 3 0.64%; Fe / SiO 2 =0.6, the particle size is 0.188mm (80 mesh), and the moisture content is 6%.

[0082] Flux: CaO and SiO 2 , CaO and SiO 2 The mass ratio is 0.8:2.1, the particle size is 0.188mm (80 mesh), and the moisture content is 6%.

[0083] Fuel: pulverized coal, particle size is 0.188mm (80 mesh), moisture content is 6%.

[0084] The mass ratio of copper concentrate and flux is 100:8.9; the mass ratio of copper concentrate and fuel is 100:2.23.

[0085] Slag type: ferrosilicon slag;

[0086] After mixing the above-mentioned copper concentrate, flux and fuel, they are continuously put into the molten pool of the bottom-blowing furnace by the conveyor belt, and the oxygen-enriched air with an oxygen volume content of 70% is sprayed through the spray gun at the bottom of the bottom-blowing furnace. The flow rate of...

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Abstract

The invention belongs to the technical field of nonferrous metallurgy, and provides an oxygen-enriched bottom blowing one-step copper smelting method. The method comprises the following steps: mixing copper concentrate, a flux and fuel, and carrying out melt chaotic stirring smelting by adopting oxygen-enriched variable-frequency bottom blowing; the gas of the oxygen-enriched variable-frequency bottom blowing is oxygen-enriched air; the flow of the oxygen-enriched air is a variable-frequency regulation flow; the variable-frequency regulation and control flow accords with a formula 1: in the formula 1, mu is equal to 4, xt is instantaneous flow, and xmax is maximum flow; the flow fluctuation of the oxygen-enriched air ranges from-20% to 20%. According to the method, oxygen-enriched variable-frequency bottom blowing is adopted for carrying out melt chaotic stirring smelting, generation of Fe3O4 can be reduced, the viscosity of smelting slag is reduced, and generation of foamed slag is reduced; meanwhile, oxygen-enriched variable-frequency bottom blowing achieves chaos stirring of the melt, enhances the heat and mass transfer effect in the smelting process, improves the smelting efficiency and prevents foaming slag from being generated.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metallurgy, in particular to a method for one-step copper smelting by oxygen-rich bottom blowing. Background technique [0002] At present, fire copper smelting mainly includes three processes: smelting, blowing and refining. [0003] Smelting, as the core process of fire copper smelting, has always been the focus of research by scholars at home and abroad. and other modern enhanced smelting technologies, these oxygen-enriched enhanced smelting technologies have solved the problems of low efficiency, high energy consumption and serious pollution in the traditional matte smelting process, but they also have some problems, such as the high dust content in the flue gas of flash smelting. , resulting in difficult flue gas treatment and higher requirements for raw materials; Aesar smelting / Ausmelt smelting cannot achieve self-heating smelting, and needs to add fuel to supplement heat, and the furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00
CPCC22B15/003
Inventor 周世伟田博魏永刚李博王华
Owner KUNMING UNIV OF SCI & TECH
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