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Method for regulating growth behavior of spinel phase in stainless steel slag

A technology of stainless steel slag and spinel phase, which is applied in the field of comprehensive utilization of metallurgical resources, can solve problems such as the difficulty of spinel phase growth, and achieve the effects of harmless treatment, increased crystallinity, and low energy consumption

Active Publication Date: 2017-12-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the growth of spinel phase is difficult in the melting and upgrading process of existing stainless steel slag, the present invention provides a method for regulating the growth behavior of spinel phase by introducing a shear force field. Applying shear force can strengthen the nucleation-growth behavior of spinel in high-temperature slag by improving the crystallization kinetics, promote the formation of large-size spinel crystals, and achieve highly stable enrichment of chromium in the spinel phase. Reduce the risk of oxidative dissolution of chromium in stainless steel slag, and provide conditions for the separation and extraction of spinel phase

Method used

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  • Method for regulating growth behavior of spinel phase in stainless steel slag
  • Method for regulating growth behavior of spinel phase in stainless steel slag
  • Method for regulating growth behavior of spinel phase in stainless steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1: Take 1 kg of stainless steel slag from a steel plant as raw material, and its chemical composition is shown in Table 1. Put the stainless steel slag in a high-temperature furnace, raise the temperature to 1650°C, and add Al with a mass of 9% of the stainless steel slag 2 o 3 Modifier. Using a magnesia single-layer three-narrow-bladed propeller-type stirring paddle, stir at the center of the melt at a rate of 50rpm. During the stirring process, the paddle reciprocates longitudinally along the central axis of the melt, and heats it at 1650°C for 10 minutes;

[0042] Table 1 Chemical composition of stainless steel slag

[0043]

[0044] Step 2: Uniformly cool the slag from 1650°C to 1250°C at a cooling rate of 1°C / min. When the temperature drops to 1250°C and the melting modification treatment is completed, the shear force input is stopped and the slag is discharged;

[0045] Step 3: The slag is cooled down to room temperature after water quenching to obtain...

Embodiment 2

[0049] Step 1: Take 1 kg of stainless steel slag from a steel factory as raw material, and its chemical composition is shown in Table 2. The stainless steel slag is placed in a high-temperature furnace, the temperature is raised to 1500° C., and an MnO modifier whose mass is 8% of the mass of the stainless steel slag is added. Use alumina double-layer three-narrow-bladed propeller-type stirring paddles, stir at a rate of 70rpm at a position lower than the center of the melt, and keep warm at 1500°C for 8 minutes;

[0050] Table 2 Chemical composition of stainless steel slag

[0051]

[0052] Step 2: Uniformly cool the slag from 1500°C to 1250°C at a cooling rate of 5°C / min. When the temperature drops to 1250°C and the melting modification treatment is completed, the shear force input is stopped and the slag is discharged;

[0053] Step 3: The slag is cooled down to room temperature after air quenching to obtain modified stainless steel slag.

[0054] The results were ana...

Embodiment 3

[0057] Step 1: Take 800g of stainless steel slag from a steel factory as a raw material, and its chemical composition is shown in Table 3. Put the stainless steel slag in a high-temperature furnace, raise the temperature to 1630°C, and add FeC with a mass of 10% of the mass of the stainless steel slag 2 o 4 Modifier. Use molybdenum single-layer three-narrow-bladed propeller-type stirring paddle, stir at the upper position of the melt center at a rate of 30rpm, and keep warm at 1630°C for 1min;

[0058] Table 3 Chemical composition of stainless steel slag

[0059]

[0060] Step 2: Uniformly cool the slag from 1630°C to 1250°C at a cooling rate of 3°C / min. When the temperature drops to 1250°C and the melting modification treatment is completed, the shear force input is stopped and the slag is discharged;

[0061] Step 3: The slag is cooled down to room temperature after being treated with heat pouring, and the modified stainless steel slag is obtained.

[0062] The resul...

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Abstract

The invention belongs to the technical field of metallurgy resource comprehensive utilization and particularly relates to a method for regulating the growth behavior of a spinel phase in stainless steel slag. The method for regulating the growth behavior of the spinel phase in the stainless steel slag includes the following steps that the stainless steel slag is enabled to be in a molten state, and a modifier is added into the stainless steel slag; shearing force is applied to an obtained material, and the stainless steel slag is kept in the molten state while shearing force is applied; and the material is cooled to room temperature to obtain the modified stainless steel slag. By means of the method, the shearing force effect is applied in the stainless steel slag molten modification process, the nucleation-growth behavior of spinel in the high-temperature molten slag is strengthened by improving the crystallization kinetic conditions, formation of large-size spinel crystals is promoted, highly-stable concentration of chromium in the spinel phase is achieved, the risk of oxidation dissolution of chromium in the stainless steel slag is lowered, and conditions are provided for separating and extracting of the spinel phase.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, in particular to a method for regulating and controlling the growth behavior of spinel phase in stainless steel slag. Background technique [0002] Stainless steel slag is an important by-product produced in the stainless steel smelting process. According to statistics, about 1 ton of stainless steel slag will be produced for every 3 tons of stainless steel produced. As an important component in stainless steel slag, chromium will be oxidized to highly toxic water-soluble Cr in the natural environment. 6+ , is the chief culprit of stainless steel slag pollution. Therefore, realizing the stable control of chromium is the key to the harmless treatment of stainless steel slag. [0003] The spinel phase is the main occurrence phase of chromium in stainless steel slag, which has strong stability under oxidation, reduction and high temperature conditions, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08
CPCC21B3/06C21B3/08Y02W30/50
Inventor 赵青操龙虎刘承军姜茂发
Owner NORTHEASTERN UNIV
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