Slagging agent for electric furnace steelmaking and manufacturing method thereof

Abstract

The invention discloses a slagging agent for electric furnace steelmaking and a manufacturing method thereof. The slagging agent comprises the following raw materials in parts by weight: 60-80% of silicon steel acid sludge, 10-25% of used magnesia-carbon bricks, 5-10% of binder, 0-15% of magnesia and 0-15% of carbon powder. The manufacturing method comprises the following steps: 1, dehydrating silicon steel acidic sludge generated after cold rolling acidic wastewater treatment for later use; 2, crushing the disassembled used magnesia-carbon bricks for later use; 3, throwing the 60-80% of silicon steel acid sludge, 10-25% of used magnesia-carbon bricks, 5-10% of binder, 0-15% of magnesia and 0-15% of carbon powder into a mixer, and fully and uniformly mixing; and 4, pressing the uniformly-mixed material by a ball press, and naturally dehydrating or baking and dehydrating to form the slagging agent. According to the slagging agent for electric furnace steelmaking and the manufacturing method thereof, the silicon steel acid sludge is processed into a slagging agent product necessary for steelmaking, and part of raw materials for steelmaking such as light-burned dolomite can be replaced.

Description

technical field [0001] The invention relates to a metallurgical enterprise solid waste and a processing method thereof, in particular to a slagging agent for electric furnace steelmaking and a manufacturing method thereof. Background technique [0002] A large amount of acid sludge is produced after treatment of acid wastewater produced by silicon steel cold rolling and pickling process. The main components of acid sludge produced after pickling wastewater treatment are calcium, magnesium, aluminum and iron oxides. The composition is shown in Table 1: [0003] Table 1: Main chemical composition of cold-rolled acid sludge, (wt %) [0004] CaO SiO 2 al 2 o 3 MgO T.Fe S P 2 o 5 Cl T.C. 15~28 5~10 8~17 10~25 15~25 0.1~1.0 0.1~2.0 0.1~1.0 1.0~5.0 [0005] At present, the treatment method of acid sludge is mainly to seek co-processing by cement enterprises for payment, but because the sludge has complex components and contai...

AI Technical Summary

Problems solved by technology

[0012] The main components of converter steelmaking sludge are Fe2O3, FeO, CaO, etc. Most of the slagging agents need to add manganese ore, dolomite, quartz sand and other raw materials, which increases the cost of recycling; stainless steel chromium-containing nickel-containing sludge is directly re-smelted The corrosion of steel to smelting facilities will increase, which will affect the life of the facilities in the long run, and these are two types of solid waste with silicon steel acid sludge