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According to reports, the University of Utah is developing a new method of ironmaking --- suspension ironmaking technology. This approach can simplify the smelting process, mainly in:
(1) direct use of iron oxide concentrate, no pellets, and sintering process; Casting defects in the semi-steel roll
Semi-steel roll wide range of uses, but there will be some flaws: face crack, a large area of ??the slag, riser shrinkage in the casting production process, the finished product rate is low, you need to analyze and to control.
1, the crack
Semi-steel roller rough on the crack of the roll surface and the end is the cause of improper C, Si content with cold paint process is unreasonable, the chemical composition of the roll material, but off the molding process is unreasonable, casting process.
2, a large area of ??the slag
Semi-steel work surface roll processing the visible area of ??the slag. Low coating strength, thickness control is not strict, the cavity and the c asting of debris in the system, the molten steel slag material cause.
3, the riser shrinkage
After the completion of the molten steel casting, the cooling time and cooling rate resulting in more formation of shrinkage defects in the riser.
Control measures are:
1, the crack
1) blast furnace C content control in the process lower limit of Si content control in the limit.
2) coating thickness to ensure that in the 0.5-1.0mm, spray evenly.
3) shape, roll neck to take the next mud of the core technology is conducive to the contraction of molten steel, to reduce shrinkage cracks, and under the roller shape R Ministry fillet trimming, should be less than cold-diameter 50-150mm, depth control in the 150-200mm.
4), casting the molten steel to maintain a large flow of the casting process, shorten the casting time to ensure that the casting speed.
2, a large area of ??the slag < br />
1) the melting process the furnace waste products, slag clean.
2) a steel ladle should be clean to ensure that the scum floating; leakage of bottom package casting ladle bottom blowing Ar, the purification of molten steel.
3) hanging sand process to increase the binder bentonite should be appropriate to avoid too little, casting caused by sand washing slag.
4) modeling is completed, the sand box paint brushing uniform clean to ensure that no floating sand. Hop Box, the cavity of the debris also clean.
3, the riser shrinkage
1) Heating risers, in order to facilitate feeding.
2) in the riser just before solidification, according to the number of steel water riser Dianbu most appropriate.
3) Dianbu riser, and then tamping riser 10-20min, and then use the feeding insulation agent covering the riser from the insulation.
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4) to prevent the next roll neck loose produce, the key is to reduce the roll neck allowance; cold iron can also be placed at the roll neck and neck at the molten steel under rapid solidification to prevent the molten steel feeding.
(2) does not require coke (coal to produce hot reducing gas, the combustion of pulverized coal) in the field;
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(3) the absence of particles bonded or melt topics, you can use high-temperature, the process may be the strength of;
(4) produced the possibility of solid particles or molten iron; valve castings
(5) primary refractory subject;
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(6) easily supply the raw materials (copper and nickel sulphide concentr ates particles had been supplied to the flash smelting furnace, more than 50 years did not float to the surface such as congestion and bonding the subject. Iron oxide concentrate more easily, due to their proximity to the gas than the sulfide particles close to the oxygen more chaos;
(7) the possibility of direct steel-making in the set of equipment.
Suspension on those grounds, as the high-intensity process is the best choice, especially iron oxide concentrate from the fine sifting. This suspension produced an example of flash melting furnace (smaller than for the iron flash restore) per year (approximately 0.6 to 0.8 t / min) produced copper at 0.3 to 0.4x10 ^ 6 tons.
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Materials and reduction of CO2 use this new technology to get the three fuel input and output flow and input and output amount, and the three manipulation from the tradi tional blast furnace fuel input and output streams and the input and output. In particular, a lot for this new technology produced by the reduction of CO2, and even coal reduction of CO2 produced in the blast furnace. Eliminated coking / combustion, the pellets and sintering stages, the proposed technology will have other environmental benefits. In the the USDOE lecture provides a typical number of pollution in the manipulation of the current blast furnace Phi matter
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