Online tempering device and method for slag tapping and cooling process of molten steel slag

Abstract

The invention relates to an online tempering device and method for a slag tapping and cooling process of molten steel slag. The online tempering method comprises the following steps of: uniformly pouring modifiers in a reducing agent cabin, a calcium agent cabin and a silicon agent cabin into a steel slag tank in the steel slag tapping process; then pouring the modifiers into a material mixing bedby adopting a crown block; stirring, crushing and uniformly mixing high-temperature steel slag by utilizing a material mixing machine, so as to provide good dynamic conditions for modification of thehigh-temperature steel slag; then cooling the modified steel slag subjected to reaction to certain temperature by adding water; and finally, carrying out hot sealing treatment. According to the online tempering device and method provided by the invention, the modifiers are added in the slag tapping process of the molten steel slag and the steel slag is tempered and modified under the condition that an external heat source is not provided, so that residual heat resources of the molten steel slag are sufficiently utilized. Steel slag components are regulated and controlled from the source, so that the recycling rate of metal iron in the steel slag can be improved, the content of the metal iron in tailings is reduced, the recycling rate of the steel slag iron is greatly improved, the grindability of the steel slag is improved and the activity index of the steel slag is remarkably improved; and resource utilization of all the steel slag is easy to realize and the online tempering device and method have great economic and social benefits.

Description

technical field [0001] The invention relates to an online tempering device and method for molten steel slag cooling process, in particular to an online conditioning device and method for molten steel slag produced in the production process of iron and steel enterprises. Background technique [0002] my country is a big country in steel production. In recent years, steel production has exceeded 900 million tons, accounting for more than half of the world's total. Steel slag is an inevitable product of the steelmaking process. Every ton of steel smelted produces 120-140kg of steel slag, and the total annual production in the country exceeds 100 million tons. The main chemical components of steel slag are CaO, SiO 2 , FeO, Fe 2 o 3 and other oxides. Generally, the content of CaO in converter steel slag is about 40%, and SiO 2 At 15-20%, the iron oxide content is 20-25%, and there are about 10% residual steel and other substances. It can be seen that steel slag contains a l...

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Problems solved by technology

However, it is not economically feasible to use this modified treatment method for production under actual industrial conditions. The estimated energy cost is too high.

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