Stainless steel acid pickling sludge briquette, as well as preparation method and application thereof

Abstract

The invention discloses a stainless steel acid pickling sludge briquette, as well as a preparation method and application thereof. The stainless steel acid pickling sludge briquette is characterized by being prepared from the components in parts by weight: 70 to 80 parts of stainless steel acid pickling sludge, 20 to 30 parts of framework material, and 2 to 5 parts of compound cellulose type binding agent; the water content of the briquette is less than or equal to 5 percent; and the breaking strength is larger than or equal to 100 kgf. The preparation method comprises the following steps of filter pressing, drying, preparing of the briquette, drying and screening. The stainless steel acid pickling sludge briquette is used as an auxiliary material so as to be applied to top-blown stirringand desulfurizing, auxiliary materials such as the stainless steel acid pickling sludge briquette and lime are stirred in a steel ladle by utilizing top blowing, a white slag with favorable fluidity and reducibility is used for desulfurizing, and low S steel water for smelting high-quality steel is provided for refining furnace argon oxygen decarburization (AOD) after slagging off. The stainless steel acid pickling sludge briquette, as well as the preparation method and the application thereof provided by the invention have the advantages that the stainless steel acid pickling sludge briquetteis high in strength, alloy components in the stainless steel sludge are effectively utilized, and the harm of the sludge on the application field is reduced.

Description

technical field [0001] The invention belongs to the technical field of stainless steel production, and in particular relates to a stainless steel pickling sludge pressure ball and a preparation method and application thereof. Background technique [0002] The amount of stainless steel pickling sludge is about 3-5% of the output of stainless steel, which belongs to hazardous waste and contains metal oxides such as Ni, Cr, Fe, etc., as well as CaF 2 , CaO, SiO 2 , CaSO 4 and other substances; especially if it contains hexavalent chromium, it will cause potential harm to the environment if it is not handled properly. In the prior art, part of the sludge is treated by applying it to stainless steel production, for example, stainless steel pickling sludge is dried physically through slab annealing; it is prepared into pressure balls and used in EAF and stainless steel pickling sludge applications AOD; steelmaking dust removal pressure ball method, etc. The disadvantage is tha...

AI Technical Summary

Problems solved by technology

The disadvantage is that the stainless steel pickling sludge is dried physically by slab annealing, which is likely to cause environmental pollution and affect the sanitation of the factory; the application of EAF is likely to cause corrosion of the water-cooled flue and increase maintenance costs; the use of pressure balls in AOD is likely to cause corrosion of the furnace body and Carburization of molten steel; In addition, the briquetting ball obtained by the existing technology has low breaking strength (<40kgf), high powder rate, and increases the burden of dust removal

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