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High-temperature steel slag modification treatment method, modified steel slag and application of modified steel slag

A treatment method and technology for steel slag, which are applied in the modification treatment of high-temperature steel slag, modified steel slag and its application fields, can solve the problems of large consumption of water resources, pollute the environment, and low proportion of use, and achieve high-efficiency utilization, simple and efficient process , the effect of high recycling rate

Pending Publication Date: 2021-09-07
SHOUGANG CHANGZHI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The waste heat of steel slag has not been effectively utilized; 2) The steel slag treatment method consumes a lot of water resources, takes a long time to process, has high input costs and pollutes the environment; 3) The use ratio of the treated steel slag as a cement admixture is low, and the steel slag cannot be used as a cement admixture. 4) The recovery ratio of Fe in steel slag is low

Method used

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  • High-temperature steel slag modification treatment method, modified steel slag and application of modified steel slag
  • High-temperature steel slag modification treatment method, modified steel slag and application of modified steel slag

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Experimental program
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Effect test

Embodiment 1

[0068] In this embodiment, a high-temperature steel slag modification treatment method includes:

[0069] (1) pre-add CDQ dedusting ash in the slag tank;

[0070] (2) Add converter slag and concentrate tailings at 1646°C to the slag tank and mix and stir for 3 minutes. The masses of converter slag, CDQ dust and concentrate tailings are 6500kg, 400kg and 2500kg respectively. get the mixture;

[0071] (3) reacting the mixture at 1380-1600° C. for 7 minutes to obtain modified steel slag.

[0072] Among them, the particle size of CDQ dust removal ash is <1mm, and the particle size of concentrate tailings is <10mm.

Embodiment 2

[0074] In this embodiment, a high-temperature steel slag modification treatment method includes:

[0075] (1) pre-add CDQ dedusting ash in the slag tank;

[0076] (2) Add converter slag and cleaned coal tailings at 1660°C to the slag tank and mix for 4 minutes. The masses of converter slag, CDQ dust and cleaned coal tailings are 6700kg, 210kg and 3400kg respectively. get the mixture;

[0077] (3) reacting the mixture at 1380-1620° C. for 8 minutes to obtain modified steel slag.

[0078] Among them, the particle size of CDQ dedusting ash is <1mm, and the particle size of cleaned coal tailings is <10mm.

Embodiment 3

[0080] In this embodiment, a high-temperature steel slag modification treatment method includes:

[0081] (1) pre-add CDQ dedusting ash in the slag tank;

[0082] (2) Add converter slag and blast furnace slag at 1670°C to the slag tank and mix and stir for 4 minutes. The masses of converter slag, CDQ dedusting ash and blast furnace slag are 6300kg, 200kg and 2400kg respectively to obtain a mixture;

[0083] (3) reacting the mixture at 1380-1630° C. for 8 minutes to obtain modified steel slag.

[0084] Among them, CDQ dedusting ash particle size <1mm, blast furnace slag particle size <10mm.

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Abstract

The invention provides a high-temperature steel slag modification treatment method, and belongs to the technical field of comprehensive utilization of industrial solid waste. The method comprises the following steps: mixing liquid steel slag, a simple substance carbon substance recovered substance and a steel slag online modifier to obtain a mixture; and performing constant-temperature treatment on the mixture to obtain modified steel slag, wherein the mass fraction of the simple substance carbon substance recovered substance in the mixture is 2.0%-5.0%; and the mass fraction of the steel slag online modifier in the mixture is 7.0%-40.0%. The method can effectively improve the recovery ratio of Fe in the steel slag, and is simple and efficient in process and low in investment cost. The invention further provides the modified steel slag and application thereof.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial solid waste, and in particular relates to a high-temperature steel slag modification treatment method, modified steel slag and application thereof. Background technique [0002] my country is a big country in steel production, accounting for nearly 50% of the world's total. Therefore, my country is also a big country in steel slag production. The annual production of steel slag is nearly 100 million tons, and slag is about 220 million tons. However, the utilization rate of steel slag in my country is extremely low. At present, the annual utilization rate is only 20.46 million tons, with a utilization rate of about 22%, and the utilization rate of slag is about 80%, with a utilization rate of 176 million tons. According to the latest statistics, as of now, the annual stockpiling of steel slag and slag has reached 121.23 million tons, and the cumulative stockpiling is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B13/00C04B5/06C04B7/147
CPCC21B3/06C21B13/0066C04B7/147C04B5/06C21B2400/02C21B2400/08Y02W30/50Y02P10/20Y02P40/10
Inventor 张联兵
Owner SHOUGANG CHANGZHI IRON & STEEL