Blast furnace molten hot slag recycling technology adopting hot molten salt method

Abstract

The invention discloses a blast furnace molten hot slag recycling technology adopting a hot molten salt method and belongs to the technical field of recycling of blast furnace molten hot slag. According to the technical scheme of the technology, the technology comprises an ammonium chloride technology and / or an ammonium sulfate technology. According to the technology, hydrochloric acid, sulfuric acid and alkali are not used, and thus while the acid and alkali expense is saved, the problem of corrosion resistance of equipment is effectively solved; while iron in the blast furnace molten hot slag is deposited and recycled through a high-temperature fire method, enthalpy of the hot slag is utilized for extracting and separating rare elements in the blast furnace molten hot slag; and elementssuch as calcium, magnesium, aluminum, titanium, silicon, manganese and fluorine in the slag can also be extracted and separated, heat energy of the blast furnace molten hot slag is fully utilized, allthe elements in the blast furnace molten hot slag can be recycled economically and reasonably, pollution is avoided, and energy and resources of the blast furnace molten hot slag are utilized.

Description

technical field [0001] The invention relates to the technical field of recycling blast furnace molten hot slag, in particular to a hot molten salt recycling process for blast furnace molten hot slag. Background technique [0002] Blast furnace molten hot slag is a by-product discharged from the blast furnace in the process of smelting pig iron. The blast furnace molten hot slag is usually released at a temperature of 1400-1600°C, and its heat content is 58-70Kg standard coal / ton slag. The sensible heat taken away by the blast furnace accounts for about 10% of the heat balance of the blast furnace, which accounts for about 4% of the total energy consumption of the iron and steel industry. Based on the current level of my country's metallurgical technology, for every ton of pig iron smelted, the amount of molten hot slag produced in the blast furnace is between 300-350Kg. Calculated as 900 million tons of iron per year, the molten hot slag of the blast furnace is about 300 mil...

AI Technical Summary

Problems solved by technology

However, most of the elements in the blast furnace molten hot slag are extracted by acid and alkali methods, but a large amount of solid acid-base waste residue and a large amount of acid-base liquid cannot be processed.

Moreover, the equipment investment is large, the product cost is high and uneconomical, resulting in the accumulation of solid waste

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