Hot metal pretreatment desilicication/dephosphorization agent and application method thereof

A technology of hot metal pretreatment and dephosphorization agent, which is applied in the field of hot metal pretreatment desiliconization/dephosphorization agent, can solve the problems of unguaranteed desulfurization and dephosphorization efficiency, small amount of red mud utilization, and high viscosity of desiliconization slag. Improve kinetic conditions, take into account the needs of desiliconization and dephosphorization, and reduce the effect of slag viscosity

Active Publication Date: 2016-01-13
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the composition of the molten iron pretreatment agent mixture of this patent, CaO/SiO 2 All above 3.0, the purpose is to create a hot metal pretreatment agent with high alkalinity to achieve desiliconization, desulfurization and dephosphorization of hot metal, but such a high alkalinity pretreatment agent is not needed in the desiliconization process, and causes The high viscosity of the desiliconization slag can easily cause serious slag foaming, overflowing the reaction vessel, and causing production and safety accidents; secondly, with such a high alkalinity pretreatment agent, it is difficult to melt the slag during the pretreatment process, reducing the efficiency of desulf

Method used

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  • Hot metal pretreatment desilicication/dephosphorization agent and application method thereof
  • Hot metal pretreatment desilicication/dephosphorization agent and application method thereof
  • Hot metal pretreatment desilicication/dephosphorization agent and application method thereof

Examples

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Example Embodiment

[0045] Example 1: Preparation of Desiliconization / Dephosphorization Agent

[0046] Select the red mud produced by the Bayer process in a domestic aluminum plant, and perform magnetic separation, purification and enrichment on the iron element to obtain high-speed iron red mud. The main components in the high-speed iron red mud are shown in Table 1:

[0047] Table 1 Main components in high-speed iron red mud

[0048] Element

[0049] After drying the high-speed iron red mud, it is uniformly mixed with lime particles (particle size ≤ 3mm) according to a mass ratio of 1:0.25 to make a desiliconization / dephosphorization agent. The overall particle size of the desiliconization / dephosphorization agent is required to be ≤3mm, among which The content of the desiliconization / dephosphorization agent with a particle size of 1-3mm is less than or equal to 5wt%, so as to facilitate the transportation and feeding of the desiliconization / dephosphorization agent. Transport by tank...

Example Embodiment

[0050] Example 2: Use of Desiliconization / Dephosphorization Agent

[0051] Desiliconization operation, dephosphorization operation or both operations are determined according to the demand of steel grades for steelmaking and smelting and the entry conditions of molten iron.

[0052] If the molten iron [Si] ≥ 0.40%, perform desiliconization operation. According to the target desiliconization amount, add desiliconization / dephosphorization agent to the molten iron. The relationship between the amount of desiliconization / dephosphorization agent and the target desiliconization amount for:

[0053] Y 1 =131.2X 1 ;

[0054] In the formula, Y 1 Represents the amount of desiliconization / dephosphorization agent added (kg / t), X 1 Represents the target desilication amount (X 1 %).

[0055] Several target desiliconization amounts are selected, and the addition amount of desiliconization / dephosphorization agent is shown in Table 2, and the molten iron silicon is reduced to less than ...

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Abstract

The invention discloses a hot metal pretreatment desilicication/dephosphorization agent. The hot metal pretreatment desilicication/dephosphorization agent is formed by mixing ferric red mud and lime particles according to the mass ratio of 1:(0.2-0.3). The content of TFe in the ferric red mud is 40-50 wt%, and the particle size of the ferric red mud is 0.088-0.5 mm. The particle size of the desilicication/dephosphorization agent is smaller than or equal to 3 mm, and the content of the desilicication/dephosphorization agent with the particle size of 1-3 mm is smaller than or equal to 5 wt%. The invention further discloses an application method of the hot metal pretreatment desilicication/dephosphorization agent. The method comprises the following steps that whether desilicication operation and dephosphorization operation are carried out independently or at the same time is determined according to the steelmaking smelting steel ball requirements and hot metal in-station conditions. When the ferric red mud is used as the desilicication/dephosphorization agent for hot metal pretreatment, furnace slag foaming can be avoided, furnace slag is prevented from overflowing out of a hot metal furnace, and the desilicication and dephosphorization effect is good.

Description

technical field [0001] The invention relates to a molten iron pretreatment desiliconization / dephosphorization agent and a using method thereof, belonging to the technical field of molten iron pretreatment in the iron and steel metallurgical industry. Background technique [0002] In the iron and steel metallurgical industry, the pretreatment process of molten iron is mainly to provide molten iron with stable composition and low phosphorus and sulfur content for the steelmaking process, so as to facilitate the operation and control of steelmaking and improve the economical efficiency of steelmaking. Therefore, it focuses on desiliconization and dephosphorization of molten iron and desulfurization in three aspects. The methods adopted mainly include powder spraying method, KR stirring method and so on. [0003] The desiliconization of molten iron pretreatment mainly utilizes the strong oxidizing property of silicon, and removes by adding solid iron oxide into molten iron: ...

Claims

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Application Information

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IPC IPC(8): C21C1/02
Inventor 王小璞王博张佩于亮涛王强刘洪银杜金科贾崇雪李鹏芸张百庆
Owner SHANDONG IRON & STEEL CO LTD
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