Pellets prepared from blast furnace slag iron fine powder as well as preparation method and application of pellets

Abstract

The invention belongs to the field of comprehensive utilization of solid waste resources and specifically relates to pellets prepared from blast furnace slag iron fine powder as well as a preparation method and application of the pellets. The invention aims at providing a method for preparing the pellets from the blast furnace slag iron fine powder, which is simple in process. The technical scheme adopted by the method provided by the invention comprises the following steps: a) performing crushing, screening, ball-milling and magnetic separation on blast furnace slag with the water content of not more than 10% to obtain iron fine powder, and controlling the particle size of the iron fine powder to be not more than 1.5mm, so that the iron fine powder with the particle size of less than 1mm accounts for above 20% of total weight of the iron fine powder and the iron content is not less than 60%; b) mixing the iron fine powder with a binding agent, adding water and uniformly mixing to obtain a mixture; and c) pressing the mixture for forming and air-drying to obtain the pellets. Compared with the conventional preparation of the pellets from steel slag, by adopting the method, the steps are saved, the production cost is reduced and the time is saved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste resources, and in particular relates to pellets prepared from blast furnace slag iron concentrate powder, a preparation method and application thereof. Background technique [0002] Blast furnace slag is an inevitable product of blast furnace ironmaking production. Since Panzhihua Iron and Steel was put into production, it has accumulated more than 50 million tons, and an annual increase of 3.5 million tons has been added. The massive accumulation of blast furnace slag has seriously affected the production of Panzhihua Iron and Steel Co., Ltd., resulting in a waste of resources. At the same time, it also has a negative impact on the surrounding natural environment of the Jinsha River Basin in the upper reaches of the Yangtze River. [0003] Foreign iron and steel plants have been producing and using consolidated pellets for many years. For example, Nippon Steel’s Nagoya Iron...

AI Technical Summary

Problems solved by technology

This method needs to dehumidify the raw materials, and after the balls are formed, they need to enter the roasting system to go through the preheating, intermediate firing, and roasting processes. The energy consumption is high and the process is relatively complicated.

[0005] In the prior art, there is no technology related to preparing pellets from iron concentrate powder extracted from blast furnace slag by cold consolidation. Those skilled in the art need a method for preparing pellets from blast furnace slag iron concentrate powder with simple process

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