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Deep deoxidation process for fire refining of copper

A deep deoxidation and pyro-refining technology, applied in the field of non-ferrous metallurgy, can solve the problems of reducing the residual oxygen of pyro-refined copper, and achieve the effect of facilitating operation and promotion, and reducing costs

Active Publication Date: 2014-07-23
昆明理工精诚科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the composition, source, physical properties or specific reaction mechanism of the traditional reducing agent, the aforementioned process is difficult to economically and effectively reduce the residual oxygen in the burnt copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the ore copper refining process of the 250t reverberatory furnace, after the oxidation and removal of impurities and slag are completed, the compressed air is used as the carrier to reduce with a coal-based reducing agent (the reducing agent described in ZL 02113269.0, ZL 02113268.2) for 20 minutes, and the unit consumption is 8 kg / t copper, the detected oxygen content is 2500 ppm; and then reduced with the reducing agent NFA for 10 min, the single consumption of 2 kg reducing agent NFA / t copper, the detected oxygen content is 900 ppm. meet expectations.

[0022] The reducing agent NFA used here is: anthracite: Al=5 (or 7 or 10): 1, obtained by mixing; the anthracite is re-selected, and the composition is 0.3% of total sulfur, 7% of ash, and 6% of volatile matter; Al is industrially pure Grade, reducing agent NFA particle size 0.1~1 mm.

Embodiment 2

[0024] In the red copper refining process of a 100t induction furnace, after oxidation and removal of impurities and clean slag, nitrogen is used as a carrier, and the reducing agent NFA is used. The reduction time is 45 minutes, the unit consumption is 11 kg reducing agent NFA / t copper, and the oxygen content is 25 ppm. meet expectations.

[0025] The reducing agent NFA used here is: mix anthracite: pitch coke = (1-8): 1 ratio into the furnace, and then add 20% of a mixture of industrial-grade purity quartz sand and lime (mixing ratio: quartz sand: lime =4:1), the mixture of the two is added into the furnace according to the ratio of the former: the latter = 3 (or 7 or 10): 1, and reacted at a high temperature of 1000~1400°C for 2 hours, and the mixture contains elemental C and a small amount of volatile matter. and silicon calcium alloy. The reducing agent NFA particle size is 1~2 mm.

Embodiment 3

[0027] In the ore copper refining process of a 350 t rotary furnace, after oxidation and removal of impurities and slag are completed, nitrogen is used as a carrier, the reducing agent NFA is used, the reduction time is 20 minutes, the unit consumption is 6 kg reducing agent NFA / t copper, and the oxygen content is 35 ppm . meet expectations.

[0028] Use the reducing agent described in Example 1 or Example 2.

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PUM

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Abstract

The invention relates to a deep deoxidation process for fire refining of copper. After the deoxidation impurity removal of fire refining of copper in a reactor reaches a predetermined indicator, two forms of oxygen exists in the reactor actually, namely oxygen [O] in liquid copper containing saturated Cu2O and oxygen (O) in Cu-saturated liquid cuprous oxide, and at the moment, by using compressed air or nitrogen as a carrier, a reducing agent NFA is sprayed into the reactor to perform reduction for 10-90 minutes, wherein the unit consumption is 2-11kg of the reducing agent NFA per ton of copper; the reducing agent NFA reacts with oxygen in a melt in a furnace to generate a gas product; the gas product overflows from the furnace, or generates a slag phase to float on the surface of Cu liquid and is discharged from the furnace, thus realizing the deep deoxidation. The application range comprises a reduction process in the later stage of fire refining of copper in the field of non-ferrous metallurgy, or a melting impurity removal process in early-stage preparation of copper material production. By adopting the process, the remaining oxygen content of copper can be less than 30-1500ppm.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a deep deoxidation process for copper fire refining. Background technique [0002] In the late stage of the pyro-refining process of electric copper production and the late stage of the melting and impurity removal process of copper processing, after oxidation, impurity removal and slag cleaning, Cu 2 O saturated liquid copper (L 1 ) in oxygen and Cu-saturated liquid cuprous oxide (L 2 ) The oxygen in ) is removed at the same time. The former is generally qualified when the deoxidation reaches 1500-2500 ppm, while the latter is qualified when it reaches 40-50 ppm due to metal processing. The reducing agents used in the deoxidation process include coal-based reducing agents (ZL 02113269.0, ZL 02113268.2), LPG, charcoal powder, diesel oil, heavy oil, liquid ammonia, etc. The reaction process can be expressed as: [0003] [Cu 2 O] Cu + R = (RO) s或g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/14
Inventor 刘中华陈雯
Owner 昆明理工精诚科技有限责任公司
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