Device and method for gas-solid ejection and granulation of molten blast furnace slags

Abstract

The invention relates to a device and a method for gas-solid ejection and granulation of molten blast furnace slags. The device comprises a molten slag lead-in unit, an ejection agent supply unit, a device wall cooling and anti-sticking unit, a rapid cooling discharge unit and a high-temperature-air discharge unit. The method includes: using a mixture of high-pressure gas and solid granules as ejection and granulation agents, performing blowing and granulation for high-temperature molten blast furnace slag liquid flow at a high speed, and breaking the flow into molten slag granules; and then, during flying of the slag granules, rapidly cooling the slag granules by fluidified cooling gas sprayed into the lower portion and anti-sticking cooling gas ejected into via the side wall in an attaching manner so that the slag granules are rapidly solidified to solid granules, and the problem of sticking of the molten slag granules is solved effectively. The method is capable of greatly promoting kinetic energy of the ejection agents to be converted into granule surface energy, ejection agent energy use ratio is increased, the small uniform slag granules are obtained, granulation and rapid cooling are achieved, the slag granules with high vitreous body rate are obtained, and usability of molten blast furnace slag material resources is guaranteed while waste heat in the slags is recovered efficiently.

Description

technical field [0001] The invention belongs to the technical field of high-temperature solid waste treatment and recovery of waste heat and energy, and in particular relates to a method for dry granulation treatment of high-temperature molten slag liquid and a rapid cooling and anti-sticking process. Background technique [0002] The metallurgical industry is the largest energy-consuming unit, with an annual energy consumption of 20GJ. Since 1980, my country's iron and steel industry has made great achievements in energy saving, but there is still a shortage in the recycling of waste heat resources. Relevant research results show that the sensible heat recovery rates of flue gas, cooling water and molten slag are very low. Among them, the recovery rate of slag sensible heat is the least, only 1.59%. Iron and steel industry slag includes ironmaking blast furnace slag, steelmaking slag, ferroalloy slag, non-ferrous smelting slag, etc. my country has the largest proportion o...

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Problems solved by technology

However, due to the limitations of the huge equipment system, large floor area, high investment cost and excessive energy loss in the system process, it has not been further promoted and applied.

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