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Phosphorous pig iron desulfurizer used for casting pre-roasting anode

A pre-baked anode and desulfurizer technology, applied in the direction of reducing gas emissions, can solve problems such as stomata shrinkage defects, affecting pouring quality, thermal cracking, etc., achieve good furnace conditions and operating conditions, reduce labor intensity of workers, and improve working environment. Effect

Inactive Publication Date: 2009-11-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
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AI Technical Summary

Problems solved by technology

Sulfur strongly promotes the whitening of cast iron, and the increase of sulfur content in phosphorus pig iron causes hot embrittlement of the phosphorus iron ring and reduces the fluidity of molten iron, resulting in thermal cracking, affecting the pouring quality and increasing the resistance
Sulfur is a strong anti-graphite spheroidizing element. In phosphorus pig iron with high sulfur content, the fluidity of molten iron decreases with the increase of manganese content. The level of sulfur content in molten iron seriously affects the spheroidization of graphite, resulting in pore shrinkage defects. Increased Fe-C pressure drop

Method used

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  • Phosphorous pig iron desulfurizer used for casting pre-roasting anode

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Experimental program
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Effect test

preparation Embodiment 1

[0021] Graphite was selected as the carbon-increasing substance in the test, and CaO, CaF 2 As a desulfurization substance, accompanied by Na 2 CO 3 、Na 2 SiO 3 Prepare phosphorus pig iron desulfurizer for prebaked anode pouring with FeO, its formula is: graphite: 2%, CaO: 42.3%, CaF 2 : 3%, Na 2 CO 3 : 3.5%, Na 2 SiO 3 : 47.7%, FeO: 1.5%.

preparation Embodiment 2

[0023] The difference between this embodiment and Example 1 is that the formula has changed, and its formula is: graphite: 3%, CaO: 40%, CaF 2 : 3%, Na 2 CO 3 : 2%, Na 2 SiO 3 : 50%, FeO: 2%.

preparation Embodiment 3

[0025] The difference between this embodiment and Example 1 is that the formula has changed, and its formula is: graphite: 4%, CaO: 45%, CaF 2 : 3%, Na 2 CO 3 : 3%, Na 2 SiO 3 : 44%, FeO: 1%.

[0026] The above-mentioned embodiments can also be exemplified. The inventor's experiments have proved that as long as it is within the scope of the present invention, a phosphorus pig iron desulfurizer for prebaked anode casting that meets the requirements can be obtained.

[0027] According to experiments, it is shown that when using the phosphorus pig iron desulfurizer for prebaked anode pouring of the present invention, the amount added in every ton of phosphorus pig iron is 2.5%. It should be added as required in the first two batches of furnace charge, otherwise it will cause poor furnace start.

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Abstract

The invention discloses a phosphorous pig iron desulfurizer used for casting a pre-roasting anode. The desulfurizer is prepared from the following raw materials by mass percentage: 2 to 4 percent of graphite, 35 to 45 percent of CaO, 3 to 5 percent of CaF2, 1 to 3 percent of Na2CO3, 40 to 50 percent of Na2SiO3, and 1 to 3 percent of FeO. By adopting the phosphorous pig iron desulfurizer used for casting the pre-roasting anode, the adding amount of the desulfurizer is 2.5 percent in each ton of phosphorous pig iron; when the desulfurizer is used in a 1.6-ton induction furnace, the produced phosphorous pig iron can meet use requirements on composition as well as performance, so that the speed of smelting the phosphorous pig iron in the induction furnace is quickened, the smelting time of the phosphorous pig iron is shortened, the electric energy is saved, and the smelting cost is saved by about 15 percent; moreover, good furnace conditions and operational conditions are kept for smelting, the working environment for workers is improved, and the labor intensity of the workers is lowered.

Description

technical field [0001] The invention belongs to the recycling utilization of phosphorus pig iron in the field of aluminum electrolysis production, in particular to a phosphorus pig iron desulfurizer for prebaked anode pouring. Background technique [0002] Prebaked anode is one of the raw materials needed for aluminum electrolysis production. The quality of prebaked anode directly affects the stability of electrolytic cell production and the quality of economic and technical indicators. Therefore, each aluminum factory attaches great importance to the production, assembly, pouring, process technology and quality of raw materials of prebaked anodes. [0003] The anode structure of aluminum electrolytic cell is mainly composed of five parts: aluminum guide rod, composite aluminum-iron explosive welding block, steel claw, phosphorus pig iron and carbon block, among which the aluminum guide rod and steel claw are connected by Al-Fe composite explosive welding block , while the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C25C3/12
CPCY02P10/134
Inventor 杨双平董洁巨建涛宋永辉张朝晖郑英辉靳文军魏新忠
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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