Hot metal pretreatment desilicication/dephosphorization agent and application method thereof

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: ...

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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 desulfurization and dephosphorization. does not guarantee

The red mud used has not been treated for iron purification, and it needs to be added with Fe 2 o 3 Mixing to increase the total iron content of the pretreatment agent to ensure the oxidation ability of the pretreatment agent increases the cost

And the patent uses a small amount of red mud, which only accounts for 15-30% of the ratio of the molten iron pretreatment agent

In addition, the production method of this patent needs to combine red mud with Fe 2 o 3 , CaO, NaCO 3 , MnO 2 , CaCl 2 , SiO 2 or other metallurgical wastes containing these components are mixed and ground, with many types of ingredients and complex process ratios

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