Molten iron dephosphorization agent, and dephosphorization and desilication method for molten iron

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

CN102199686AInactive Publication Date: 2011-09-28BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-09-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a molten iron dephosphorization agent, and a dephosphorization and desilication method for molten iron. The molten iron dephosphorization agent is composed of the following components in parts by weight: 20-35 parts of acid-mixed iron oxide powder, 50-60 parts of dust-removed shot-blasting powder and 14-25 parts of dust-removed stainless steel smelting ash. The molten irondephosphorization agent provided by the invention can be applied in all molten iron pretreatment processes, and has a strong dephosphorization function; simultaneously the molten iron dephosphorization agent contains solid oxides containing Cr and Ni, can slightly increase the Ni content in molten iron at a dephosphorization terminal by 5-8%, compared with original Ni content, and can reduce Ni addition amount during sequent smelting processes and lower production cost when used for smelting stainless steel; and all the raw materials for the molten iron dephosphorization agent are solid wastes containing Ni and Cr generated during stainless steel production processes of steel enterprises, and the wastes are recycled for molten iron dephosphorization, thus saving cost and reducing the emission of wastes.
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Description

technical field

[0001] The invention relates to a molten iron dephosphorization agent and a method for desiliconization and dephosphorization of 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 a...

Examples

Embodiment 1

[0128] Preparation of molten iron desiliconization agent

[0129] 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.

[0130] The quality of the finished product silicon removal agent is controlled as follows:

[0131] 1) After processing, the moisture content of the ...

Embodiment 2

[0134] Preparation of molten iron desiliconization agent

[0135] 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.

[0136] 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

[0138] Preparation of molten iron desiliconization agent

[0139] 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.

[0140] 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.

[0141] Table 3: Ratio of finished products of molten iron desiliconization agent

[0142]

Mixed acid

Iron oxide powder

shot blasting

Dust removal powder

Stainless steel

Steelmaking dust

hot rolled

Iron oxide scale ...