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Molten iron desiliconizing reagent and molten iron desiliconizing method

A technology of desiliconization agent and molten iron, which is applied in the fields of desiliconization agent and desiliconization of molten iron, and can solve problems such as rising production costs and desiliconization of molten iron

Inactive Publication Date: 2011-09-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The desiliconization agents and dephosphorization agents involved in the prior art disclosed above and their preparation and use methods all have a common shortcoming. The preparation of desiliconization agents and dephosphorization agents requires additional purchase of raw materials, such as alkali or alkaline earth metals And its alloys, lime, fluorite, sodium carbonate, sodium sulfate, iron oxide, calcium fluoride, etc.
Therefore, it will inevitably lead to an increase in the production cost of molten iron desiliconization and dephosphorization

Method used

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  • Molten iron desiliconizing reagent and molten iron desiliconizing method

Examples

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Effect test

Embodiment 1

[0119] Preparation of molten iron desiliconization agent

[0120] process such as Figure 11 As shown, the above-mentioned 4 kinds of materials enter the preparation stage of the desiliconization agent after the raw materials are prepared. First, they are weighed and mixed according to the ratio of the ingredients of the desiliconization agent in the column corresponding to Example 1 in Table 3, and then baked. It is best to control The water content is required to be ≤3%, and then fully mixed and stirred to form a finished desiliconization agent, which is transported by pneumatic transport tanker tanker into the tanker and transported to the molten iron desiliconization site, such as the molten iron pouring station, by pneumatic conveying. The material is sent to the desiliconization silo for desiliconization of molten iron.

[0121] The quality of the finished product silicon removal agent is controlled as follows:

[0122] 1) After processing, the moisture content of the ...

Embodiment 2

[0128] Preparation of molten iron desiliconization agent

[0129] process such as Figure 11 As shown, weigh according to the proportions of the raw materials of the desiliconizing agent in the column corresponding to Example 2 in Table 3, and adopt the same method as in Example 1 to prepare the molten iron desiliconizing agent of the present invention.

[0130] Further, the physical and chemical indicators of the molten iron desiliconization agent in Example 2 of the present invention were detected, and the specific data are shown in Table 4.

Embodiment 3

[0132] Preparation of molten iron desiliconization agent

[0133] With the four solid wastes of collected mixed acid iron oxide powder, shot blasting dust removal powder, stainless steel steelmaking dust removal dust and hot-rolled iron oxide scale, dry the moisture, and take by weighing the corresponding proportion in the corresponding column of Example 3 in Table 3 The above four solid wastes are mechanically crushed, stirred and mixed evenly, and dried to obtain the molten iron desiliconization agent of the present invention.

[0134] Further, the physical and chemical indicators of the molten iron desiliconization agent in Example 3 of the present invention were detected, and the specific data are shown in Table 4.

[0135] Table 3: Ratio of finished products of molten iron desiliconization agent

[0136]

mixed acid

Iron oxide powder

shot blasting

Dust removal powder

Stainless steel

Steelmaking dust

hot rolled

Iron oxide scale ...

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Abstract

The invention discloses a molten iron desiliconizing reagent and a molten iron desiliconizing method. The molten iron desiliconizing reagent comprises the following components in part by weight: 10 to 20 parts of mixed acid ferric oxide powder, 15 to 25 parts of shot blasting dedusting powder, 10 to 20 parts of stainless steel making dedusting ash and 40 to 60 parts of hot rolling ferric oxide scale. The molten iron desiliconizing reagent can be used all molten iron pretreatment processes and has high desiliconizing capacity; meanwhile, chrome- and nickel-containing solid oxides are used in the formula, the nickel content in the molten iron at the end of desiliconization is slightly improved by 5 to 8 percent on the basis of the original nickel content, so that for smelting stainless steel, the added amount of nickel during smelting in a subsequence process can be reduced correspondingly and the production cost can be lowered; and all raw materials in the formula are from chrome- and nickel-containing solid waste from production in stainless steel production processes of stainless steel enterprises, and by recovering and processing the waste and using the processed product for molten iron desiliconizing, cost is saved and the discharge of the waste is reduced.

Description

technical field [0001] The invention relates to a molten iron desiliconization agent and a method for desiliconizing molten iron. Background technique [0002] With the improvement of people's living standards, the use of stainless steel products is increasing, making the desiliconization and dephosphorization processes of hot metal pretreatment in the iron and steel industry an indispensable link in steelmaking production. [0003] Since the phosphorus content required for finished stainless steel products is below 0.020%, and all processes after the electric furnace do not have the dephosphorization function, this requires that the phosphorus content of the molten iron after dephosphorization in the molten iron pretreatment is less than 0.008% (low phosphorus steel Varieties require phosphorus content ≤ 0.006%). Relatively speaking, the silicon content of blast furnace or iron ore smelting reduction ironmaking furnace (hereinafter referred to as COREX furnace) is generall...

Claims

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Application Information

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IPC IPC(8): C21C7/04
Inventor 郑皓宇徐文杰蒋兴元仝正辉李安东
Owner BAOSHAN IRON & STEEL CO LTD
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