A high value-added recycling method for microwave-strengthened steel slag particles

A high value-added, steel slag pellet steel technology, applied in the direction of recycling technology, process efficiency improvement, etc., can solve the problems of lower sintering ratio, alkaline composition of pellet steel, waste of available resources, etc., to reduce energy consumption. The effect of reducing energy consumption, improving the recovery rate, and relieving the pressure of recycling

Active Publication Date: 2022-05-27
内蒙古中盛工程技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operation process of this method is complicated, and the value of metallic iron in steel slag grain steel is also reduced, resulting in a waste of available resources.
[0006] In the prior art, the recycled steel slag granulated steel is re-added to the blast furnace batching for secondary smelting, but when the granulated steel is added for production operations, the granules are sized before the blast furnace is put into the furnace to ensure that the grain size reaches the pellet standard, improving Blast furnace air permeability; however, there are many problems such as the return of grain steel to ore, the composition of grain steel is alkaline, and the sintering ratio in actual production is relatively low, and the cost is rising.

Method used

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  • A high value-added recycling method for microwave-strengthened steel slag particles
  • A high value-added recycling method for microwave-strengthened steel slag particles
  • A high value-added recycling method for microwave-strengthened steel slag particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: In terms of mass percentage, in the steel slag grain steel of this example, TFe=68.32%, MFe=54.06%, and FeO=10.16%;

[0033] A high value-added recycling method of microwave-enhanced steel slag grain steel (see figure 1 ),Specific steps are as follows:

[0034] (1) crush and pulverize 100g of steel slag grain steel to a particle size of ≤0.5mm, and mix with 6.39g of reducing agent (coal powder) to obtain mixture A; wherein the carbon content in the coal powder is 68.4%;

[0035] (2) under the microwave power of 2450±50MHz, in step (1), mixture A is heated to a temperature of 900° C. by microwave and pretreated at a constant temperature for 15 minutes to obtain mixture B;

[0036] (3) under the microwave power of 2450±50MHz, in step (2), mixture B is heated to a temperature of 1100° C. by microwave and subjected to solid-phase reduction reaction for 35 minutes to obtain mixture C;

[0037] (4) step (3) mixture C is poured into water for water quenching and c...

Embodiment 2

[0039] Example 2: In terms of mass percentage, TFe=76.13%, MFe=61.26%, FeO=9.02% in the steel slag grain steel of this example;

[0040] A high value-added recycling method of microwave-enhanced steel slag grain steel (see figure 1 ),Specific steps are as follows:

[0041] (1) crush and pulverize 200g of steel slag grain steel to a particle size of ≤0.5mm, and mix with 19.41g of reducing agent (coal powder) to obtain mixture A; wherein the carbon content in the coal powder is 54.6%;

[0042](2) under the microwave power of 2450±50MHz, in step (1), mixture A is heated to a temperature of 900° C. by microwave and pretreated at a constant temperature for 10 min to obtain mixture B;

[0043] (3) under the microwave power of 2450±50 MHz, in step (2), mixture B is heated to a temperature of 1150° C. by microwave and subjected to solid-phase reduction reaction for 28 min to obtain mixture C;

[0044] (4) step (3) mixture C is poured into water for water quenching and cooling, and t...

Embodiment 3

[0046] Example 3: In terms of mass percentage, in the steel slag grain steel of this example, TFe=72.10%, MFe=55.94%, and FeO=11.02%;

[0047] A high value-added recycling method of microwave-enhanced steel slag grain steel (see figure 1 ),Specific steps are as follows:

[0048] (1) crush and pulverize 150g steel slag grain steel to particle size≤0.5mm, and mix with 10.31g reducing agent (carbon powder) to obtain mixture A; wherein the carbon content in the carbon powder is 75.43%;

[0049] (2) under the microwave power of 915±50MHz, in step (1), mixture A is heated to a temperature of 950° C. by microwave and pretreated at a constant temperature for 15 minutes to obtain mixture B;

[0050] (3) under the microwave power of 915±50MHz, in step (2), mixture B is heated to a temperature of 1180° C. by microwave and subjected to solid-phase reduction reaction for 25 minutes to obtain mixture C;

[0051] (4) step (3) mixture C is poured into water for water quenching and cooling, ...

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Abstract

The invention relates to a high-value-added recycling method for microwave-enhanced steel slag granular steel, which belongs to the technical field of secondary recycling of steel slag resources. In the present invention, the steel slag grains are crushed to a particle size of ≤0.5 mm, mixed with a reducing agent uniformly to obtain a mixture A, the mixture A is heated to a temperature of 900-950° C. by microwaves and pretreated at a constant temperature for 10-15 minutes to obtain a mixture B, and the mixture B is heated to a temperature of 900-950° C. Microwave heating to a temperature of 1000-1200°C and solid phase reduction reaction for 20-40 minutes to obtain a mixture C, which is poured into water for water quenching and cooling, and then separated by crushing, grinding, and magnetic separation to obtain direct reduced iron powder and tailings. The invention adopts non-blast furnace smelting technology to realize high value-added recycling of steel slag grain steel, and the obtained direct reduced iron products can be directly used as raw materials for the preparation of high value-added products such as industrial pure iron and special steel.

Description

technical field [0001] The invention relates to a high value-added recovery and utilization method of microwave-strengthened steel slag grain steel, and belongs to the technical field of secondary recovery of steel slag resources. Background technique [0002] Steel slag pellets are mainly derived from steel slag, which is a derivative of the steelmaking process. It is a metal product with a particle size of 5-40mm obtained after the steel slag is processed by cooling, crushing, magnetic separation and screening. The iron content of steel slag pellets is relatively high, generally exceeding 60 wt%, but there are also impurities such as silicate gangue or ferrite in the steel slag pellets, which will lead to the deterioration of the quality of steel-making or iron-making products when used directly. The iron content in the steel slag pellets is relatively high, and the composition is mainly metal iron, and there are also some iron oxides, calcium oxide, silicon oxide and othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C21B3/04
CPCC21B13/00C21B3/04C21B2200/00Y02W30/50Y02P10/20
Inventor 郑善举李萌蘖
Owner 内蒙古中盛工程技术有限公司
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