Preparation method of magnesium-based desulfurizing agent

Abstract

The invention belongs to the technical field of desulfurization of metallurgical molten iron and particularly relates to a preparation method of a magnesium-based desulfurizing agent. The preparation method comprises the following steps of: (1) processing a magnesium ingot raw material and feeding the processed magnesium ingot raw material into a pelletizer for pelletizing; (2) feeding a product obtained in the step (1) into the inlet of a first group of cyclone tanks (101), feeding the product into a first group of one-stage blanking bins (201) from the discharge hole of the first group of cyclone tanks (101), feeding the product into a first group of two-stage blanking bins (301) from the discharge hole of the first group of one-stage blanking bins (201), blowing the product into a final stage cyclone tank (401) and finally feeding the product into a final stage storage tank (501) and a one-stage vibrating screen (1001) for screening; (3) passivating raw material particles and charging a heated and stirred passivated magnesium material into a passivated magnesium storage bin; and (4) feeding passivated magnesium into a cyclone separator by using a radiating conveying mechanism so as to select the passivated magnesium material. The preparation method has high safety performance, remarkable environmental protection efficiency and appropriate flame retarding time; and a granularity range value meets the structural demand of a spray gun.

Description

technical field [0001] The invention belongs to the technical field of metallurgical molten iron desulfurization, and in particular relates to a preparation method of a magnesium-based desulfurizer. Background technique [0002] The iron and steel industry is faced with a strong demand to improve the quality of steel and increase varieties, and what affects this result is the sulfur content in steel. Sulfur has adverse effects on the performance of steel; sulfur reduces the plasticity and toughness of steel, and affects the surface quality and internal integrity of steel. Thus, gone are the days when a minimum sulfur content of 0.035% was required in steel. Now for most applications, the average sulfur content in steel is required to be within the range of ≤0.015%. In some steels, such as pipeline steel, the sulfur limit even reaches the level of 0.002-0.005%. However, the traditional blast furnace-blown oxygen furnace production process has no way to meet the above requir...

AI Technical Summary

Problems solved by technology

[0003] The existing magnesium-based desulfurizer preparation process still has a low degree of automation, poor fluidity of the target product passivated metal magnesium, short flame retardant time, and difficult particle size range to meet the needs of the spray gun structure

In addition, the granular magnesium used as a raw material is often transported manually. This mode of work has low production efficiency and poor safety performance. Working in an open environment is also prone to pollution and other problems.

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