A kind of preparation method of spherical granular iron for steelmaking

A technology of spherical granules and granulated iron, which is applied in the field of iron and steel metallurgy, and can solve the problems of easy oxidation of granulated iron, affecting the recovery of small particle size granulated iron, and high loss of granulated iron

Active Publication Date: 2021-08-20
ANGANG STEEL CO LTD
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Problems solved by technology

[0004] However, in the application of granular iron in steelmaking, the granular iron is easy to oxidize under the high temperature environment of steelmaking, which directly leads to high loss of granular iron and affects the recovery of small particle size granular iron

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  • A kind of preparation method of spherical granular iron for steelmaking

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preparation example Construction

[0023] A method for preparing spherical granular iron for steelmaking, comprising the following steps:

[0024] 1) Magnetic separation and screening: the converter waste slag is crushed and magnetically separated, and then the granular iron obtained after magnetic separation is screened to select the granular iron with a particle size of less than 15mm; the granular iron with a particle size of less than 15mm is used as a raw material;

[0025] 2) Surface cleaning: Since the surface of the selected granular iron will have an embroidery layer or some residue will adhere to the surface after being placed for a period of time, it is necessary to treat the surface of the collected granular iron so as not to affect the bonding of the subsequent granular iron. Surface cleaning adopts simple physical treatment methods, and does not use pickling and other processes to avoid pollution to the environment. Put the screened granular iron into a container, fill the container with water, vi...

Embodiment 1

[0035] A method for preparing spherical granular iron for steelmaking, the production process of which is as follows: the converter waste slag is crushed and magnetically separated, and then the granular iron obtained after the magnetic separation is screened to select the granular iron with a particle size of less than 15 mm. Put a certain amount of granulated iron with a particle size of less than 15mm into a closed container, and the water surface in the closed container can cover the upper surface of the granulated iron. Through the vibration of the closed container, the granulated iron will collide and rub to remove surface rust and residue. Air-dry the small iron grains after surface treatment. Then it is prepared according to the proportion that the mass of the collected granular iron accounts for 80%, and the mass of the binder accounts for 20%, wherein the mass of metallurgical lime in the binder accounts for 45%, and the tar accounts for 55%. Put the small iron parti...

Embodiment 2

[0037] A method for preparing spherical granular iron for steelmaking, the production process of which is as follows: the converter waste slag is crushed and magnetically separated, and then the granular iron obtained after the magnetic separation is screened to select the granular iron with a particle size of less than 15mm. Put a certain amount of granulated iron with a particle size of less than 15mm into a closed container, and the water surface in the closed container can cover the upper surface of the granulated iron. Through the vibration of the closed container, the granulated iron will collide and rub to remove surface rust and residue. Air-dry the small iron grains after surface treatment. Then it is prepared according to the ratio that the mass of the collected granular iron accounts for 75%, and the mass of the binder accounts for 25%, wherein the mass of metallurgical lime in the binder accounts for 50%, and the tar accounts for 50%. Put the small iron particles i...

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Abstract

A method for preparing spherical granular iron for steelmaking, comprising the following steps: crushing and magnetically separating converter waste slag to screen out granular iron with a particle size of less than 15 mm; cleaning the surface of the granular iron; then air-drying or oven-drying; 75% to 90%, and the mass of the binder accounts for 10% to 25% for batching; put the small iron and binder into the mixer for mixing, and make a material ball of 45 to 65mm after mixing. Low-temperature baking; after the low-temperature baking, the temperature of the material ball drops to 35-45°C, and the material ball is pressed into spherical granular iron with a diameter of 40-60mm. The present invention bonds small grains of iron together, enlarges the size of small grains of iron, facilitates the coating of anti-high temperature oxidation materials on the surface of the grains of iron, and prevents the oxidation of small grains of iron in a high temperature environment of steelmaking, resulting in high loss of grain iron , and can be coerced by light and thin scrap steel in the recycling and processing process, so that small iron particles can be effectively recycled.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing spherical granular iron for steelmaking. Background technique [0002] Waste slag granular iron is a mixture of iron and steelmaking oxidized slag recovered from converter waste slag through magnetic separation and screening, and its iron content is between 60% and 90%. According to the calculation of my country's converter steel output, my country extracts at least 40 million grain iron from converter waste slag every year. According to statistics, there are currently about 1.5-2 million tons of converter waste slag and granulated iron circulating in the scrap steel market, and its main purpose is to produce crude steel with other steelmaking raw materials. Although this method can replace part of the raw materials for steelmaking, the utilization of converter waste slag granular iron is still limited to a certain extent due to factors s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248C22B1/242
CPCC22B1/242C22B1/248Y02P10/20
Inventor 许孟春廖相巍于赋志李德军康伟朱晓雷陈东李广帮赵成林
Owner ANGANG STEEL CO LTD
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