Method for processing convertor steelmaking slag

Abstract

The invention relates to a method for processing convertor steelmaking slag. A raw material containing SiO2 is added into thermal convertor steelmaking slag, so that CaO in the convertor steelmaking slag generates 2CaO.SiO2 through a solid-phase reaction in a high temperature. The 2CaO.SiO2 generating crystal transformation and volume expansion in a cooling process of the convertor steelmaking slag is utilized to realize the natural pulverization of the convertor steelmaking slag, convertor slag with even grain sizes is obtained, and grained iron is magnetically separated. According to the technical scheme, the raw material containing the SiO2 is added into the convertor steelmaking slag in the high temperature, the crystal transformation and the volume expansion of the 2CaO.SiO2 in the cooling process of the convertor steelmaking slag are utilized to realize the natural pulverization of the convertor steelmaking slag, the convertor slag with even grain sizes is obtained, the grained iron is magnetically separated, tailings are recovered, and large amounts of heat energy of high-temperature convertor steelmaking slag in the cooling process are recovered.

Description

technical field [0001] The invention relates to a method for processing converter steelmaking slag. In the method, SiO-containing 2 Raw material, using 2CaO·SiO generated at high temperature 2 During the cooling process of the slag, crystal transformation and volume expansion occur, and the natural pulverization of the converter slag is realized, and the converter slag with uniform particle size is obtained, and the deep processing of the steel slag and the comprehensive utilization of the converter slag are realized. Background technique [0002] Converter slag is the main solid waste in the steelmaking industry. About 100-130kg of converter slag is produced for every ton of steel smelted. Based on the current steelmaking capacity in my country, nearly 70 million tons of converter slag will be produced every year. Converter slag contains 36-55 % CaO and 15-33% FeO, and the slag also contains Si, Mg, Al and other valuable elements, if not utilized, these resources will be wa...

AI Technical Summary

Problems solved by technology

In the above-mentioned methods, except for the thermal braising method, the other steel slag treatment methods require the steel slag to have good fluidity, but in the actual production process of the steel plant, due to many reasons, it is difficult to ensure the fluidity of the steel slag. At this time, it is necessary to add a slag blowing The heating equipment increases the investment cost and energy consumption, while the thermal braising method has a long treatment period and the tailings have uneven particle size

In terms of equipment complexity, investment and operating costs, the shallow plate method has many process steps, and the drum method has complicated equipment and high maintenance difficulty, all of which require higher operating costs.

Improper operation of the water quenching method is likely to cause explosions, consumes a lot of water, and the tailings are difficult to handle. In addition, the above-mentioned steel slag treatment processes do not recover the heat energy of the steel slag, and the sensible heat of the steel slag is completely lost. For the shallow plate method and the wind quenching method, there is still water vapor generation. In terms of the activity and stability of the treated steel slag, only the steel slag obtained by the thermal braising method and the wind quenching method has better stability

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