Process and device for processing liquid steel slag

Abstract

The invention provides a process and device for processing liquid steel slag, belonging to the technical field of the metallurgical equipment and aiming at solving the problems of liquid steel slag granulation and liquid steel slag sensible heat recovery. The process for processing the liquid steel slag comprises the following steps: a, granulating the liquid steel slag by quenching gas; b, cooling the high-temperature liquid solid steel slag; c, recovering liquid steel slag sensible heat; and d, reusing cooling gas. The invention also provides a device for processing liquid steel slag. The invention is mainly characterized in that firstly, the liquid steel slag is granulated in a sealed granulating tank, the liquid steel slag is small and uniform, the pure Fe in the liquid steel slag can not be oxidized and the economic benefit of the liquid steel slag processing process is improved; secondly, the liquid solid steel slag is cooled in a sealed cooling tank, less cooling gas leaks, the dust pollution is reduced, and less cooling gas is supplemented; and thirdly, the inert gas is used as the cooling gas in the granulating tank and the cooling tank, and the cooling gas inversely exchanges heat with the liquid steel slag, thus the efficiency of exchanging heat between the liquid steel slag and the cooling gas is improved, the temperature of the cooling gas at the outlet is increased, and the liquid steel slag sensible heat is recovered.

Description

technical field [0001] The invention relates to a liquid steel slag granulation technology, in particular to a liquid steel slag treatment process and device integrating steel slag granulation, cooling and sensible heat recovery, and belongs to the technical field of metallurgical production. Background technique [0002] Steel slag is a by-product in the steelmaking process. The temperature of the furnace is 1550℃~1650℃, and the physical heat is 1.7GJ / t, which is equivalent to about 60kg standard coal per ton of slag. It is the only high-quality waste heat that cannot be effectively recycled in the current steel enterprises resource. In addition, the total iron content of solid steel slag is 15% to 28%, and a considerable part exists in the form of elemental iron, accounting for about 8% to 10% of the total. The steel slag tailings after iron extraction also have high mineral value, and the main chemical components are CaO, SiO 2 , FeO, MgO, etc., are non-renewable minera...

AI Technical Summary

Problems solved by technology

However, the air quenching process still has defects such as the complete oxidation of the elemental iron in the slag during the air quenching process, and the low recovery rate of the sensible heat of the liquid slag or even no recovery.

[0004] In summary, it can be seen that most of the metallurgical steel slag waste heat recovery processes are in the research and exploration stage, and there is still a lack of processes suitable for industrial applications.

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