A reducing agent nfa for deep deoxidation in copper industry
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A deep deoxidation and reducing agent technology, applied in the field of non-ferrous metallurgy, to achieve stable raw material sources, achieve emission reduction, and facilitate industrial promotion
Active Publication Date: 2016-03-02
云南泉凯冶金材料有限公司
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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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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 0.1~1mm; use industrial grade alumina to prepare metal Al, and prepare it into 0.1~1mm particle. 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 is used in the ore copper refining process of a 250t reverberatory furnace. First, it is reduced with a coal-based reducing agent for 20 minutes, with a unit consumption of 8kg / t copper, and the oxygen content is 2500ppm; t copper, the detected oxygen content is 900ppm, which meets 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 0.1~1mm particles; use industrial grade quartz sand to prepare metal Si, prepare it into 0.1~1mm 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 0.1~1mm, 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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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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