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Melted iron desulfuration pretreatment furnace slag modifier and method for making same

A technology for desulfurization and modifier of molten iron, applied in the field of molten iron pretreatment, can solve problems such as limited modification ability and incompatibility, and achieve the effects of reducing iron content, iron loss, and viscosity.

Inactive Publication Date: 2009-06-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main problems: ①Limited upgrading ability
But it is not suitable for CaO-Mg desulfurization and the modification of slag after desulfurization with a large amount of slag before desulfurization

Method used

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  • Melted iron desulfuration pretreatment furnace slag modifier and method for making same
  • Melted iron desulfuration pretreatment furnace slag modifier and method for making same
  • Melted iron desulfuration pretreatment furnace slag modifier and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The hot metal desulfurization pretreatment slag modifier is formulated and processed from glass powder, potassium feldspar, fluorite and soda; its chemical composition (weight%) satisfies: SiO 2 50%, CaF 2 19%, Al 2 o 3 3%, CaO 3% and K 2 O+Na 2 O 24%.

[0028]In order to realize that the modifier melts evenly on the molten iron desulfurization pretreatment slag, and give full play to the various functions of the desulfurization slag modifier, the modifier of the present invention is prepared by the following process: first, the raw materials glass powder, potassium feldspar, The chemical composition of fluorite and soda; secondly, according to the above chemical composition, calculate the weight of the required raw materials; then melt the above-mentioned proportionally weighed raw materials in the submerged arc furnace, and cool naturally after being released from the furnace; crushing and processing to 200 mesh; Add the crushed raw materials into the pan gran...

Embodiment 2

[0037] The chemical composition (weight %) of molten iron desulfurization pretreatment slag modifier is: SiO 2 52%, CaF 2 18%, Al 2 o 3 4%, CaO 4% and K 2 O+Na 2 O 21%. Its preparation method is with embodiment 1.

[0038] The composition and weight of the molten iron in the hot metal tank, the amount of slag in the hot metal tank before desulfurization, the adding method and the adding amount are all the same as in Example 1.

[0039] The modification effect of desulfurization slag after injection of different desulfurizers is shown in Table 3:

[0040] Table 3 Modification effects of modifiers on slag after desulfurization using different desulfurizers

[0041]

[0042] In Table 3, on the basis of Example 1, the formula of the modifier for hot metal desulfurization pretreatment slag is changed, and the modification effect of the modifier on the slag after desulfurization by different desulfurizers is the same as that in Table 2.

Embodiment 3

[0044] The chemical composition of the molten iron desulfurization pretreatment slag modifier is as in Example 1, and the desulfurizer in this example is the same, and its formula is 15%Mg+80%CaO+5%CaF 2 ; Except that the consumption of the molten iron desulfurization pretreatment slag modifier that adds in every heat ladle is different, other conditions are identical with embodiment 1.

[0045] See Table 4 and Table 5 for the modification effect of desulfurization slag when the amount of modifier is different:

[0046] Table 4 Modification effect of desulfurization slag with different modifier dosage

[0047]

[0048] According to the above examples, after adding the molten iron desulfurization pretreatment slag modifier, the separation of slag and iron is better, the slag and iron are easy to remove, and the slag removal time is reduced, which ultimately leads to a reduction in process time and process temperature drop. Therefore, after adding the hot metal desulfurizati...

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Abstract

The invention discloses a molten iron desulfurization pretreatment slag modifier and a preparation method thereof. The molten iron desulfurization pretreatment slag modifier takes glass powder, potassium feldspar, fluorite and soda as raw materials and is made by the refining processes of crashing, compounding and granulating through a disc-typed granulator, etc. According to the weight proportion, the chemical components of the modifier are 49-57 percent of SiO2, 18-25 percent of CaF2, 2-5 percent of Al2O3, 2-6 percent of CaO and 15-25 percent of K2O and Na2O. The molten iron desulfurization pretreatment slag modifier of the invention is suitable for being used in the molten iron desulfurization pretreatment technology by adopting CaO-Mg as desulfurization agent. The desulfurization slag modifier is of good capabilities in lowering slag basicity and slag melting temperature and improving rheology character and aggregation performance of desulfurization slag. By improving slag surface tension and lowering slag viscosity, the invention realizes the purposes of reducing slag iron content, slag skimming time and temperature drop and improving production efficiency.

Description

technical field [0001] The invention relates to a slag modifier for molten iron desulfurization pretreatment, in particular to a modifier for slag after molten iron desulfurization is performed on a CaO-Mg desulfurizer, and belongs to the field of molten iron pretreatment. technical background [0002] The pretreatment of molten iron is to control the sulfur content of molten iron to a reasonable range, so as to shorten the smelting time of the converter, improve the working efficiency of the converter and reduce the cost of steelmaking. However, the hot metal desulfurization pretreatment generally has the problem of a large amount of iron in the slag after desulfurization and difficult slag removal, especially in the CaO-Mg injection desulfurization process, the iron loss caused by the iron in the slag reaches about 5Kg / t iron. From the perspective of production practice, the slag after desulfurization has problems such as high alkalinity and poor fluidity, resulting in lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 谢兵王时松何生平李刚刁江李玉刚王雨王谦
Owner CHONGQING UNIV
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