Slagging agent used in converter steelmaking, and preparation method thereof

Abstract

The invention discloses a slagging agent used in converter steelmaking, and a preparation method thereof. The slagging agent is composed of, by mass, 50-55% of converter sludge, 35-45% of steel rolling oxide scale, and 5-10% of an adhesive. The preparation method comprises the steps that: (1) the converter sludge is bake-dried by using a rotary drying kiln, wherein a baking temperature is 750-850 DEG C; the rotary drying kiln also has a crushing and grinding function, and sludge particle size is lower than 3mm; (2) the raw materials are weighed according to the following mass percentages and are mixed in a mixing chamber: converter sludge 50-55%, steel rolling oxide scale 35-45%, and adhesive 5-10%; the mixed raw material is delivered to a stirring machine, and is well mixed with water; (4) the well mixed raw material is manufactured into pellets with a specification of 28*38mm by using a pellet pressing machine, such that the converter steelmaking slagging agent provided by the invention is prepared.

Description

technical field [0001] The invention relates to a slagging agent for converter steelmaking and a preparation method thereof, which belongs to the field of metallurgy and is mainly used in converter smelting. Background technique [0002] The task of steelmaking is to produce high-quality molten steel whose temperature, composition and cleanliness meet the specified range, and slag making is the key to steelmaking. It not only affects the quality of steel, but also has a close relationship with steel output, raw materials and energy consumption. . Converter blowing requires early and good slag melting, and the melting point of CaO is as high as 2000°C, so a flux must be used to melt CaO as soon as possible to obtain early slag with a certain basicity. In the past, iron oxide scale and iron ore used as converter slagging agents were easy to stick to the silo, which was very inconvenient to operate, and could easily cause unstable temperature drop in smelting, dry ore in the m...

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Problems solved by technology

[0004] The existing patent CN1176311A discloses "an iron oxide scale fluxing slag agent and its manufacturing method". The fluxing agent uses glass water as an adhesive. It cannot be stored immediately, and the process steps are relatively cumbersome; the existing patent CN1083892C discloses a "method for producing steelmaking slagging agent with steelmaking converter sludge", in which the steelmaking converter dedusting sludge is mixed with fuel and additives, and after Mixing, molding, sintering, crushing and sieving processes, and finally made into slagging agent

The additives involved in this patent contain fluorite powder, which can corrode the lining of the converter and reduce the service life of the lining. At the same time, because no suitable adhesive is used, it needs to be extruded and then sintered, and the size of the extruded billet is large. After sintering, the follow-up crushing process is carried out, and finally the slagging agent with suitable particle size is screened out, which cannot be formed at one time, and the production efficiency is low

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