Method for carrying out remelting, reduction and modification treatment on massive steel slag

A treatment method and technology for steel slag, which can be applied in sustainable waste treatment, solid waste management, climate sustainability, etc., and can solve the problems of slow hydration and hardening of steel slag cement, low total amount, and impact on large-scale popularization and application.

Active Publication Date: 2014-05-14
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron oxide and other oxides combine to form minerals. All current steel slag treatment processes cannot realize the reduction and recovery of oxidized iron elements, resulting in waste of iron elements.
Therefore, the hydraulic cementitious components in steel slag (such as C 3 S, C 2 S, etc.) The total amount is small and the quality is poor, resulting in slow hydration and hardening of steel slag powder and steel slag cement, and low early strength, which affects large-scale popularization and application

Method used

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  • Method for carrying out remelting, reduction and modification treatment on massive steel slag
  • Method for carrying out remelting, reduction and modification treatment on massive steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, take 1000kg of massive steel slag, take coke containing 100kg of C (carbon) as reducing material, and take coke containing 100kg of SiO 2 and Al 2 o 3 Kaolin is used as a modified material, where SiO in kaolin 2 and Al 2 o 3 The total weight is 50kg, of which SiO 2 with Al 2 o 3 The mass ratio is 1:0.2, and then the reduced material is crushed to a particle size of 5 mm, and the modified material is crushed to a particle size of 25 mm. Mix the above-mentioned steel slag, coke and kaolin evenly in the heating device, raise the temperature to 1350°C, and perform mechanical stirring at the same time. After the material is completely melted, keep it for 10 minutes. The molten iron and slag are separated naturally, and the molten iron is discharged, and the slag is cooled. Then carry out chemical analysis on the molten slag and test the gelling activity index of the tailings. The chemical analysis results are shown in Table 1, and the mortar strength test a...

Embodiment 2

[0020] Example 2, take 1000kg of massive steel slag, take coal powder containing 200kg of C (carbon) as reducing material, and take 1000kg of coal powder containing SiO 2 and Al 2 o 3 The fly ash is used as a modified material, wherein the SiO in the fly ash 2 and Al 2 o 3 The total weight is 100kg, SiO 2 with Al 2 o 3 The mass ratio is 1:0.1, and then the reduced material is crushed, and the particle size after crushing is 2 mm, and the modified material is crushed, and the particle size after crushing is 10 mm. Mix the steel slag, coal powder, and fly ash of the above weight evenly and place them in the heating device, raise the temperature to 1500°C, and carry out gas stirring at the same time. After the material is completely melted, keep it for 12 minutes. The molten iron and slag are separated naturally, and the molten iron is discharged, and the slag is discharged. Cool down. Then carry out chemical analysis on the molten slag and test the gelling activity index...

Embodiment 3

[0021] Example 3, take 1000kg of massive steel slag, take a mixture of pulverized coal and coke containing 350kg of C (carbon) as a reduction material, and take a mixture containing SiO 2 and Al 2 o 3 The sand is used as a modified material, and the SiO in the sand 2 and Al 2 o 3 The total weight is 150kg, of which SiO 2 with Al 2 o 3 The mass ratio is 1:0.3, and then the reduced material is crushed, and the particle size after crushing is 10 mm, and the modified material is crushed, and the particle size after crushing is 30 mm. Mix the above-mentioned steel slag, coal powder, coke and sand evenly in the heating device, raise the temperature to 1550°C, and carry out mechanical stirring at the same time. After the material is melted, keep it for 13 minutes. The molten iron and slag are separated naturally, and the molten iron is discharged, and the slag is cooled. deal with. Then carry out chemical analysis on the slag and test the gelling activity index of the tailing...

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Abstract

The invention relates to a method for carrying out remelting, reduction and modification treatment on massive steel slag. The method comprises the following steps of (1) mixing materials, uniformly mixing the massive steel slag and a reduced and modified material, and placing into a heating device; (2) increasing the temperature of a mixed material obtained from the step (1) to 1350-1550 DEG C, and stirring at the same time; (3) after the material is completely reacted, naturally separating molten iron from molten slag, discharging the molten iron, and then carrying out cooling treatment on the molten slag. The method disclosed by the invention has the advantages of no steel slag granularity and component limit, short flow, high-efficiency metal element recovery and environmental friendliness; according to the method, the tailings are used as hydraulic cementing materials.

Description

technical field [0001] The invention relates to a metallurgical slag resource recovery and high-value utilization method, in particular to a remelting reduction modification treatment method for massive steel slag. Background technique [0002] my country is the world's largest steel producer. In 2012, the global crude steel output reached 1.548 billion tons, and my country's crude steel output reached 717 million tons, accounting for about half of the global total. The production of steel slag is about 93 million tons, and the comprehensive utilization rate is only about 22%. A large amount of steel slag is dumped and disposed of, occupying land and polluting the environment. [0003] Non-utilization of steel slag is the biggest waste of resources. First, steel slag contains about 10% metallic iron. Because molten steel splashes and slag adheres and wraps together during slag making, it is difficult to separate and recycle by magnetic separation. About 5% of the residual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C04B7/147C04B18/14
CPCY02P40/10Y02W30/50Y02W30/91
Inventor 郝以党张艺伯胡天麒孙树杉夏春闾文吴桐吴龙
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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