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Reductant NFA used for deep deoxidization in the copper industry

A deep deoxidation and reducing agent technology, applied in the field of non-ferrous metallurgy, to achieve the effects of convenient transportation, storage and on-site management, stable source of raw materials, and conducive to industrial promotion

Active Publication Date: 2014-08-13
云南泉凯冶金材料有限公司
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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 aforementioned reducing agents, it is difficult to economically and effectively reduce the residual oxygen in the refined copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select ordinary anthracite, re-election, analysis composition is 0.3% total sulfur, 20% ash, 6% volatile matter, crushed and sieved into particles of 0.1~1 mm; prepare metal Al with industrial grade alumina, and prepare it into 0.1~ 1 mm particles. After the two kinds of particles are mixed according to the ratio of the former: the latter = 5:1, it is the reducing agent NFA.

[0020] The prepared reducing agent NFA was used in the ore copper refining process of a 250t reverberatory furnace. Firstly, the coal-based reducing agent was used for reduction for 20 minutes, the unit consumption was 8 kg / t copper, and the oxygen content was detected to be 2500 ppm; then the reducing agent NFA was used for 10 minutes. The unit consumption is 2 kg / t copper, and the detected oxygen content is 900 ppm, meeting the expected requirements.

Embodiment 2

[0022] Using petroleum coke, desulfurization, deashing, and volatile matter, control the total sulfur to 0.4%, the ash content to 7%, and the volatile matter to 5%, to obtain solid carbon-containing and hydrogen-containing materials with low sulfur, low ash, and low volatile matter; broken and screened into 0.1~1 mm particles; use industrial grade quartz sand to prepare metal Si, prepare it into 0.1~1 mm particles, and mix the two kinds of particles according to the ratio of the former: the latter = 7:1, which is the reducing agent NFA .

[0023] The prepared reducing agent NFA was applied according to the method of Example 1.

Embodiment 3

[0025] Use pitch coke to desulfurize, deash, and volatile matter, control the total sulfur to 0.5%, the ash content to 3%, and the volatile matter to 2%, to obtain solid carbon-containing and hydrogen-containing materials with low sulfur, low ash, and low volatile matter; use industrial grade Alumina is prepared into metal Al, which is prepared into particles of 0.1-1 mm, and the two kinds of particles are mixed according to the ratio of the former: the latter = 10:1, which is the reducing agent NFA.

[0026] The prepared reducing agent NFA was applied according to the method of Example 1.

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PUM

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Abstract

The invention relates to a reductant NFA used for deep deoxidization in the copper industry and belongs to the technical field of non-ferrous metallurgy. The reductant NFA is obtained by removing impurities of anthracite or petroleum coke and pitch coke, subjecting oxidized ore of Al, Si, Ca and Mg to strong reduction to obtain elementary substances or alloys, separately smashing and sieving the abovementioned two raw materials to obtain particles having a size of 0.1-5 mm, and mixing the two kinds of materials according to the requirements of the refining process to obtain the reductant NFA. The reductant NFA can also be obtained by directly mixing the two raw materials, subjecting the mixture to strong reduction at high temperature, smashing and sieving. In a reduction stage in the later period of fire refining of crude copper, single adoption of the reductant NFA or combination of the reductant NFA with a traditional reductant can achieve the objective of deep deoxidization of fire-refined copper and can make the resident oxygen lower than 30-1500 ppm. The reductant NFA is suitable for the cooper smelting industry and the copper processing industry.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a reducing agent NFA for deep deoxidation in the copper industry. Background technique [0002] In the production of copper pyrometallurgy, the general industrial refining process is to oxidize blister copper with compressed air first, so that the impurities to be removed form oxides and enter the slag (such as FeO, NiO, SnO, As 2 o 5 , Sb 2 o 5 、Bi 2 o 5 etc.) or into the gas phase (such as ZnO, SO 2 、As 2 o 3 , Sb 2 o 3 ), after cleaning the slag, spray the reducing agent into the copper liquid to remove the oxygen in the copper, and then cast the fine copper and send it to the next process for processing. Because crude copper contains Cu generally above 98.5%, the oxidation process of Cu atoms and O 2 Molecules are more likely to collide, and at 1200°C Cu 2 The saturation concentration of O in liquid copper can reach about 12.4%, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/10C22B15/14
Inventor 刘中华陈雯
Owner 云南泉凯冶金材料有限公司
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