Steel slag micro-powder selecting system utilizing waste heat flue gas of steel plant

Abstract

The invention discloses a steel slag micro-powder selecting system utilizing waste heat flue gas of a steel plant. The system comprises a waste heat flue gas source, a waste heat flue mechanism, a waste heat flue gas pressurizing mechanism, a gas source, an after-burning type hot air heater, a static powder selector, a feeding mechanism, a coarse material storage mechanism, a cyclone barrel, a dust removal mechanism, a fine material storage mechanism and an exhaust mechanism. The waste heat flue gas in the waste heat flue gas source sequentially enters the waste heat flue mechanism, passes thewaste heat flue pressuring mechanism and enters the after-burning type hot air heater to be heated. The waste heat flue gas enters the static powder selector from the after-burning type hot air heater, coarse materials in the static powder selector are stored in the coarse material storage mechanism, fine materials are stored in the fine material storage mechanism after being subjected to gas-material separation in the cyclone barrel, air flowing out of the cyclone barrel is filtered and exhausted through the dust removal mechanism, the air is heated into hot air in the hot air heater throughthe waste heat flue gas of waste heat of the steel plant, the waste heat flue gas of the waste heat of the steel plant is recycled, and the fuel cost in a hot air furnace is greatly reduced.

Description

[0001] The invention relates to the technical field of steel slag micropowder manufacturing, in particular to a steel slag micropowder separation system utilizing waste heat flue gas from a steel plant. Background technique [0002] At present, steel slag and slag are the metallurgical slag with the largest emissions in the iron and steel industry. According to the relevant iron-making and steel-making process, the output of steel slag is 12-15% of the crude steel output, and the slag is 25%-35% of the crude steel output. The slag produced by blast furnace smelting has great activity after water quenching. After being made into micropowder, it can be used as cement admixture and concrete admixture with a comprehensive utilization rate of more than 90%. The steel slag produced by steelmaking has poor stability due to the presence of free calcium oxide and magnesium oxide, and the utilization rate is less than 20%. At present, a promising application of steel slag is to make ste...

AI Technical Summary

Problems solved by technology

Due to the presence of free calcium oxide and magnesium oxide in the steel slag produced in steelmaking, the stability is poor, and the utilization rate is less than 20%.

In the existing technology, the waste heat generated by different equipment and processes in these iron and steel plants is directly discharged, resulting in a great waste of resources

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