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Method for modifying steel slag

A steel slag and modification technology is applied in the field of industrial solid waste resource utilization and environmental protection engineering.

Active Publication Date: 2019-06-07
湖南省道同环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a steel slag modification method, the purpose of which is to solve the problem of low stability and low activity of steel slag at the same time, and realize the purpose of maximizing the utilization of converter steel slag

Method used

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  • Method for modifying steel slag
  • Method for modifying steel slag
  • Method for modifying steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get the high-temperature converter steel slag that steelmaking plant produces and place in the slag tank, add 0.5% boron modifier (B in the boron modifier) ​​wherein 2 o 3 account for more than 0.8%), when it cools to about 600°C, spray water into the slag tank to seal it, the waste heat of steel slag turns the water in the slag tank into steam, and the steam discharge pipe installed on the slag tank adjusts the water in the slag tank The steam pressure is about 0.2MPa. The thermal stress generated by the steel slag’s own heat cracks the large steel slag, and at the same time, a large amount of saturated steam penetrates into the steel slag, and interacts with the free calcium oxide f-CaO and free magnesium oxide f-MgO in the steel slag to generate volume expansion stress, so that the steel slag is further powdered The entire slag stewing time is 12 hours, and the particle size of steel slag after pulverization is less than 10mm.

[0027] Mix the pulverized steel slag...

Embodiment 2

[0036] Take the high-temperature converter steel slag produced in the steelmaking plant and place it in the slag tank, add 3% boron modifier to it, and when it cools to about 800°C, spray water into the slag tank to seal it, and the waste heat of the steel slag will burn the inside of the slag tank. The water in the slag tank is turned into water vapor, and the steam pressure in the slag tank is adjusted to about 0.3MPa by the steam discharge pipe installed on the slag tank. The thermal stress generated by the steel slag’s own heat cracks the large steel slag, and at the same time, a large amount of saturated steam penetrates into the steel slag, and interacts with the free calcium oxide f-CaO and free magnesium oxide f-MgO in the steel slag to generate volume expansion stress, so that the steel slag is further powdered melting, the whole stewed slag time is 8 hours. The particle size of steel slag after pulverization is less than 10mm.

[0037] The pulverized steel slag is m...

Embodiment 3

[0045]Take the high-temperature converter steel slag produced in the steelmaking plant and place it in the slag tank, add 1% boron modifier to it, and when it cools to about 700°C, spray water into the slag tank to seal it, and the residual heat of the steel slag will burn the inside of the slag tank. The water in the slag tank is turned into water vapor, and the steam pressure in the slag tank is adjusted to about 0.3MPa by the steam discharge pipe installed on the slag tank. The thermal stress generated by the steel slag’s own heat cracks the large steel slag, and at the same time, a large amount of saturated steam penetrates into the steel slag, and interacts with the free calcium oxide f-CaO and free magnesium oxide f-MgO in the steel slag to generate volume expansion stress, so that the steel slag is further powdered melting, the whole stewed slag time is 10 hours. The particle size of steel slag after pulverization is less than 10mm.

[0046] The pulverized steel slag i...

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Abstract

A method for modifying steel slag includes the following steps: adding a modifier into steel slag of a high-temperature converter, cooling to 600-800 DEG C, and then placing the mixture in a sealed environment for water spraying hot braising treatment to obtain pulverized steel slag; mixing that pulverized steel slag with clay and quicklime according to a mass ratio of 45: (12-18): (37-43), and uniformly stirring to obtain a mixture; finally calcining the mixture at 1300-1450 DEG C for 20-30 minutes, cooling to room temperature to obtain steel slag with active cement clinker. The steel slag modified by the method provided by the invention has qualified stability, improved activity and can replace part of cement. After replacing the cement with the modified steel slag, the hydration is slowin the early stage, but the 28-day flexural compressive strength is equivalent to that of the cement, and the production cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of resource utilization of industrial solid waste and environmental protection engineering, in particular to a method for modifying steel slag. Background technique [0002] In recent years, with the continuous increase of my country's steel production, the production of steel slag, a by-product of the steelmaking process, has also increased sharply. Converter is still the main steelmaking method in China. After years of research, domestic iron and steel enterprises, scientific research institutions and building materials enterprises have made some progress in the utilization of steel slag. Steel slag has been successfully applied in construction, road engineering, agricultural production, and metallurgical furnace charge. and sewage treatment. However, the comprehensive utilization rate of steel slag in my country is still low, resulting in a large amount of steel slag being discarded and accumulated. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/06
Inventor 谢勇
Owner 湖南省道同环保科技有限公司
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