Method for eliminating white structure of high-purity pig iron for hydrogen-based smelting reduction casting and pig iron

A high-purity pig iron, hydrogen-based technology, applied in the field of eliminating the white structure of high-purity pig iron for hydrogen-based smelting reduction casting, to achieve the effect of promoting carbon precipitation, promoting nucleation, and improving casting performance

Active Publication Date: 2022-02-01
内蒙古赛思普科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems and achieve corresponding technical effects, the present invention proposes a method for eliminating the white structure of high-purity pig iron for hydrogen-based smelting reduction casting, which solves the problem of high-purity pig iron for smelting and casting in the prior art. white mouth organization problem

Method used

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  • Method for eliminating white structure of high-purity pig iron for hydrogen-based smelting reduction casting and pig iron
  • Method for eliminating white structure of high-purity pig iron for hydrogen-based smelting reduction casting and pig iron
  • Method for eliminating white structure of high-purity pig iron for hydrogen-based smelting reduction casting and pig iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Hydrogen-melting reduction smelting castings with high purity steel, when the height of the iron liquid level reaches 1850 mm, is prepared;

[0039] Then, the temperature was measured at 1405 ° C, and the main elements were shown in Table 1:

[0040] Table 1

[0041] element C Si Mn P S Ti content% 4.15 0.001 0.015 0.009 0.062 0.001

[0042] Chemical composition and particle size of silica matrix

[0043] Table 2

[0044] element Si BA CA granularity content% 67 5.2 2.5 3-10mm

[0045] The aidic zirconium silicon chemical composition and particle size:

[0046] table 3

[0047] element Zr Si FE granularity content% 36 49 margin 3-10mm

[0048] Chemical composition and particle size of strontium silicon gem

[0049] Table 4

[0050] element Sr Si FE granularity content% 0.85 75 margin 0.3-0.7mm

[0051] According to the chemical composition of silicate calcium in Table 2, ...

Embodiment 2

[0061] Hydrogen-melting reduction smelting castings with high purity steel, when the height of the iron liquid level reaches 1850 mm, is prepared;

[0062] Then, the temperature was measured at 1398 ° C, and the main elements were shown in Table 6:

[0063] Table 6

[0064] element C Si Mn P S Ti content% 4.21 0.001 0.019 0.011 0.069 0.001

[0065] Chemical composition and particle size of silica matrix

[0066] Table 7

[0067] element Si BA CA granularity content% 62 4.2 3.1 3-10mm

[0068] The aidic zirconium silicon chemical composition and particle size:

[0069] Table 8

[0070] element Zr Si FE granularity content% 35.5 46 margin 3-10mm

[0071] Chemical composition and particle size of strontium silicon gem

[0072] Table 9

[0073] element Sr Si FE granularity content% 0.72 76.2 margin 0.3-0.7mm

[0074] According to the chemical composition of silicate calcium in Table...

Embodiment 3

[0084] Hydrogen-melting reduction smelting castings with high purity steel, when the height of the iron liquid level reaches 1850 mm, is prepared;

[0085] Then, the temperature was measured on the raw iron ferrite, the temperature was 1421 ° C, and chemical analysis was carried out. The main elements were shown in Table 11:

[0086] Table 11

[0087] element C Si Mn P S Ti content% 3.92 0.001 0.021 0.015 0.058 0.001

[0088] Chemical composition and particle size of silica matrix

[0089] Table 12

[0090] element Si BA CA granularity content% 65 4.9 3.1 3-10mm

[0091] The aidic zirconium silicon chemical composition and particle size:

[0092] Table 13

[0093] element Zr Si FE granularity content% 37 47 margin 3-10mm

[0094] Chemical composition and particle size of strontium silicon gem

[0095] Table 14

[0096] element Sr Si FE granularity content% 1.05 77 margin 0.3-0.7mm ...

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Abstract

The invention discloses a method for eliminating a white structure of high-purity pig iron for hydrogen-based smelting reduction casting. The method comprises the characteristics of the high-purity pig iron for casting produced by a hydrogen-based smelting reduction non-blast furnace ironmaking process, and comprises primary inoculation of pig iron liquid, desulfurization, secondary inoculation and external refining degassing (O, N, H) treatment. The high-purity pig iron for casting produced by the hydrogen-based smelting reduction process is low in silicon, phosphorus and titanium, the primary inoculation treatment comprises the step of adding a silicon-barium-calcium inoculant and an auxiliary agent into molten iron, and the secondary inoculation treatment comprises the step of adding a strontium-silicon inoculant into the molten iron to strengthen elements promoted to be graphitized in the molten iron, so that the graphitization capacity of the molten pig iron is enhanced, carbon atoms are separated out, and a white structure generated by carbon and iron compounds formed in the solidification and crystallization process is avoided. By means of the technical scheme, the problem of the high-purity pig iron white structure for casting produced through an existing hydrogen-based smelting reduction process is solved.

Description

Technical field [0001] Embodiments of the present disclosure generally relate to the field of black metal smelting technology, and more particularly to a method of eliminating hydrogen-based melt reduction casting high-purity iron white mouth tissue and pig iron. Background technique [0002] The foundry is the basic industry of the manufacturing industry, while the casting high purity iron is a key basic material for high-end cast iron parts. Traditional casting high-purity steel is produced using a blast furnace long process ironmaking process, including (1) select feedstock: Take advantage of high-quality minerals, select low P, low Ti, low trace elements, iron concentrate; (2) Iron Mine powder abrasive process: Improve the fineness of iron powder and the strength of the pellets, reduce the impurity content of TiO2 and P2O5 in the pellets; (3) Optimize sintering pre-match: automation for ferrite powder and lime With the process, two matching two mix, ensure the taste, alkalini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/08C21C1/04C21C1/02B22D1/00B22D3/00
CPCC21C1/08C21C1/04C21C1/02B22D1/00B22D3/00Y02P10/25
Inventor 张勇徐涛周海川卜二军白新社任俊程鹏昝智
Owner 内蒙古赛思普科技有限公司
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