Gas quenching method for improving stability of steel slag and recycling physical heat of molten steel slag

Abstract

The invention relates to a gas quenching method for improving the stability of steel slag and recycling physical heat of molten steel slag, and belongs to the technical field of environmental protection of metallurgical industry solid waste disposal, secondary resource reutilization and the like. According to the technical scheme, CO2 in a large amount of coal gas generated by iron and steel enterprises is used for carrying out gas quenching on the molten steel slag in a gas quenching chamber, high-quality iron-rich powder and tailing powder are obtained after levigating and magnetic separation are carried out, secondary resource iron-rich powder can be completely utilized in multiple ways, and tailings can be efficiently utilized as high-quality secondary resources. In the gas quenching process, the cold-state CO2 and the molten slag are subjected to rapid heat exchange, the physical heat of the molten slag is converted into the physical heat of the CO2, the waste heat is recycled through a heat exchange device, and the purified CO2 obtained after dust removal is recycled. According to the gas quenching method, the problems of reutilization of free active substances of the steel slag, physical heat recycling of the steel slag and the like can be comprehensively solved, the use problem of partial capture of CO2 in the coal gas is solved, and safe, efficient and environment-friendly quenching, sorting and reutilization processes of the steel slag can be realized.

Description

technical field [0001] The invention relates to a gas quenching method for improving the stability of steel slag while recovering the physical heat of molten steel slag, and belongs to the field of environmental protection technologies such as solid waste disposal in the metallurgical industry and secondary resource reuse. Background technique [0002] Steel slag is a bulk solid waste produced in the iron and steel industry, and its resource utilization has always been strongly concerned by the society. From the initial extensive disposal methods such as direct dumping, hot pouring, shallow pan, iron selection, and stockpiling, to the current popular hot stewing, drum, multi-channel crushing and sorting, as well as new technologies such as gas quenching and rotating cup granulation The emergence of technology; from the extensive land occupation caused by extensive treatment to the refined reuse technology, the treatment and reuse of steel slag has undergone qualitative chang...

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Problems solved by technology

It is also proposed that carbon dioxide is passed into the emulsion of steel slag and water vapor or water for reference, so that free calcium oxide can generate calcium carbonate, improve the stability of steel slag, and realize the solidification of carbon dioxide. The key to this type of technology must also be water effect, and require longer reaction times at lower temperatures

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