Utilization method of vanadium-containing iron blocks

Abstract

The invention discloses a utilization method of vanadium-containing iron blocks. In the method, the vanadium-containing iron blocks are added in steel tapping and refining processes. The utilization method specifically comprises the following steps: (1) steel is tapped when the final temperature of a converter is larger than or equal to 1,650 DEG C, argon blowing and stirring are performed in thewhole process of steel tapping, the argon blowing intensity is controlled at 5-8 L / min / t steel, and 10-17 kg / t steel of vanadium-containing iron blocks are uniformly added to a steel ladle when 1 / 5 ofsteel is tapped; and (2) the argon blowing intensity is controlled at 5-8 L / min / t steel during refining, 10-17 kg / t steel of vanadium-containing iron blocks are added when the temperature is larger than or equal to 1,580 DEG C, after addition of the vanadium-containing iron blocks, stirring is carried out at 5-8 L / min / t large argon amount for 3-5 min, and the next refining operation is performed.The vanadium-containing iron blocks are added into molten iron directly to realize deoxidation and alloying, elements in the iron blocks can be efficiently utilized, and the utilization method can significantly increase the steel output and reduce the production cost as compared with a traditional manner in which iron blocks are added to a converter.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a utilization method of vanadium-containing iron block. Background technique [0002] As a rare element, vanadium has been widely used in steelmaking production, especially in the production process of grade III and above steel bars, vanadium alloys are generally used for microalloying. The way to obtain vanadium alloy is basically: vanadium-titanium magnetite is smelted in blast furnace to obtain vanadium-containing molten iron, vanadium-containing molten iron is extracted by converter to obtain vanadium slag, vanadium slag undergoes a series of treatments to obtain vanadium products including flake V2O5, vanadium alloy, etc. Vanadium products are then applied to steelmaking and related fields. [0003] In order to reduce the cost of alloying, metallurgical enterprises are also constantly exploring the use of other vanadium-containing materials and methods to rep...

AI Technical Summary

Problems solved by technology

The above technologies mainly use vanadium oxides and liquid vanadium-containing hot metal to replace vanadium alloys for alloying, but the above technologies also have certain problems. For example, the use of vanadium oxides needs to increase the consumption of deoxidizers and reducing agents. During the alloying process Some other alloying elements will be lost, and the use of liquid vanadium-containing hot metal needs to increase corresponding equipment and facilities to implement the process, which requires a large investment. For vanadium molten iron, raw material acquisition is limited, and it is also very difficult to keep the molten iron warm. The existing vanadium-containing iron nuggets are obtained by the company through external procurement, and the addition method is only used as the cold material of the vanadium extraction converter. After adding this vanadium-containing (about 0.667%) iron nuggets to the converter, affected by the temperature of molten iron and the smelting cycle, the vanadium-containing iron nuggets cannot be fully melted in the converter to increase the output of vanadium slag, which greatly causes the loss of vanadium.