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Pre-melted refining slag

A refining slag and pre-melting technology, which is applied in the field of iron and steel smelting, can solve the problems of unfavorable refining slag desulfurization and volume expansion, and achieve the effects of small erosion, fast slagging speed and large capacity

Inactive Publication Date: 2011-07-06
丹东泓辉科大高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The production of existing refining slag: use shaft furnace to sinter all kinds of raw materials and coke to form semi-premelted refining slag. Since the coke contains ash, the alkalinity of the slag system will decrease. At the same time, if the ingredients are unreasonable, it will Dicalcium silicate is formed in the slag system, because dicalcium silicate undergoes a phase change during cooling, resulting in volume expansion, which causes the pulverization of the slag system; secondly, coke contains a large amount of sulfur, which is absorbed by lime during the sintering process. Remains in the refining slag, which is not conducive to the desulfurization of the refining slag;

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] CaO92% of active lime is selected, and the rest are impurities;

[0016] In the high alumina bauxite composition, Al 2 o 3 88%, Fe 2 o 3 1.5%, SiO 2 5%, the others are impurities;

[0017] In the composition of magnesia, MgO93%, CaO1.6%, SiO 2 3.5%, caustic soda 0.3%, others are impurities;

[0018] Among the borax ingredients, B 2 o 3 68%, Na 2 O30%, Na 2 CO 3 0.5%, Na 2 SO 4 0.4%, NaCl0.1%, others are impurities;

[0019] The above-mentioned raw materials are as follows according to the weight ratio: active lime 68, high alumina bauxite 23, borax 1, magnesia 2, through crushing, batching, mixing, pre-melting and other processes to synthesize refining slag.

Embodiment 2

[0021] Among the ingredients of active lime, CaO93%, the others are impurities;

[0022] In the high alumina bauxite composition, Al 2 o 3 89%, Fe 2 o 3 1%, SiO 2 4%, the others are impurities;

[0023] Among the magnesia components, MgO95%, CaO1%, SiO 2 2%, caustic soda 0.1%, others are impurities;

[0024] Among the borax ingredients, B 2 o 3 69%, Na 2 O29%, Na 2 CO 3 0.3%, Na 2 SO 4 0.2%, NaCl0.05%, others are impurities;

[0025] The above raw materials are prepared according to weight ratio as follows: active lime 60, high alumina bauxite 30, borax 5, magnesia 7, through crushing, batching, mixing, pre-melting and other processes to synthesize refining slag.

Embodiment 3

[0027] Among the ingredients of active lime, CaO95%, the others are impurities;

[0028] In the high alumina bauxite composition, Al 2 o 3 90%, Fe 2 o 3 0.5%, SiO 2 3%, others are impurities;

[0029] In the composition of magnesia, MgO95%, CaO0.5%, SiO 2 2%, the others are impurities;

[0030] Among the borax ingredients, B 2 o 3 69%, Na 2 O30%, Na 2 CO 3 0.5%, Na 2 SO 4 0.4%, NaCl0.1%;

[0031] The above-mentioned raw materials are compared by weight as follows: active lime 54, high alumina bauxite 35, borax 6, magnesia 4, through crushing, batching, mixing, pre-melting and other processes to synthesize refining slag.

[0032] In addition, the refining slag can be prepared separately according to different weight ratios of the components, and the desulfurization kinetic experiment between the RH desulfurization refining slag and molten steel can be carried out by using a thyristor intermediate frequency induction furnace. Table 1 lists the test formulations, w...

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Abstract

The invention discloses pre-melted refining slag comprising the following components in proportion by weight: 54-68 portions of active lime, 23-35 portions of high-alumina bauxite, 1-6 portions of borax and 2-7 portions of magnesite. The invention has the advantages of short refining time, high scorification speed, good desulfurization degree, no rephosphorization, low abrasion to a ladle liner, no caking of slags, complete smelting within two minuets after electrification and reduction of energy loss. Compared with a sintering shaft furnace, the electro-smelting has less sulphur and phosphorus-containing detrimental impurities, no pollution of liquid steel, large refining slag sulfur-washing capacity and more than 80 percent of desulfurization degree with the adoption of adequate lime; the sulfur content of an LF finished product can be controlled beneath 0.001 percent, the HR sulfur content can be controlled beneath 0.0005 percent, pulverization is avoided, and the shelf life is more than half year.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a pre-melted refining slag. Background technique [0002] LF furnace (LADLE FURNACE) is the ladle refining furnace, which is the main refining equipment outside the furnace in steel production. Its main tasks are: ①Desulfurization ②Temperature regulation ③Precise composition fine-tuning ④Improve the purity of molten steel ⑤Slagging. [0003] During the refining of the LF furnace after the converter, the interface reaction of slag-gold is accelerated due to argon blowing and stirring, and the temperature compensation is performed by arc heating to achieve the effects of dephosphorization, desulfurization, deoxidation and removal of other gases. In order to make the electrodes buried in the slag stably, it is necessary to adjust the basic slag to achieve good foaming performance, so that the slag can foam and maintain a long submerged arc time. [0004] After the basic slag...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 杜志宝冯为民王辅强
Owner 丹东泓辉科大高温材料有限公司
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