Manufacturing method for composite cast segment for dry-type waste heat recovery for blast furnace slag

Abstract

The invention discloses a manufacturing method for a composite cast segment for dry-type waste heat recovery for blast furnace slag. The manufacturing method comprises the following steps: a copper ball is adopted as an inner core of the composite cast segment, and the inner core copper ball and an outer shell material are enabled to form the composite cast segment in a manner of steel die casting, ferrite steel is adopted as the outer shell steel material of the composite cast segment, and the volume ratio of the copper ball to the outer shell material is 1: 4 to 1: 15; and a casting temperature is 1510 DEG C to 1380 DEG C. The copper core in the composite cast segment has a high heat conductivity coefficient, and is capable of realizing rapid heat exchange and heat storage after making contact with the liquid-state blast furnace slag; and the outer ferrite steel is long in service life, and capable of meeting the continuous use requirement of a dry-type waste heat recovery process for the blast furnace slag. Due to the outer steel shell body of the composite cast segment, recovery and reuse for the cast segment can be realized through a magnetic separation process. The compositecast segment has an inner-copper and outer-steel structure, and the copper core is high in heat exchange speed, and higher in high-temperature-impact-resistant capacity. The composite cast segment isproduced through a steel die; the casting process is low in exhaust process difficulty; and the copper ball wrapped by molten steel is high in centering degree.

Description

technical field [0001] The invention relates to the technical field of composite casting section manufacturing, in particular to a method for manufacturing a composite casting section for blast furnace slag dry waste heat recovery. Background technique [0002] Blast furnace slag is a by-product of blast furnace smelting. Its main components are calcium oxide, magnesium oxide, aluminum oxide, silicon dioxide, etc., which can replace natural rocks in the production of cement or slag for building materials. The temperature of blast furnace slag is higher than 1500℃, and the heat contained in 1 ton of blast furnace slag is equivalent to 64kg of standard coal. There is no other effective way of recovering waste heat. Therefore, not only the sensible heat and latent heat of blast furnace slag cannot be recycled, but also cause significant energy waste. Moreover, the INBA method of washing slag with water also causes a large amount of waste of water resources, and also causes s...

AI Technical Summary

Problems solved by technology

[0007] However, the steel balls in the prior art are difficult to meet the requirements of the blast furnace slag waste heat recovery process of the steel ball cold quenching method, and there are relatively few related manufacturing technologies for the special composite steel balls for the blast furnace slag waste heat recovery process