A method for making cold-pressed pellets for steelmaking

Abstract

A manufacturing method for cold-pressed pellets for steelmaking comprises the manufacturing technological steps that (1) steelmaking secondary fly ash, converter mud and oxide scale are mixed in advance with the weight ratio of (20-23):(55-65):(10-20), and evenly stirred into a mixture; (2) a binder is prepared through water-soluble sodium carboxymethycellulose and industrial effluent at the weight ratio of 1:(15-50) for standby application; (3) a magnesium chloride solution is prepared by magnesium chloride hexahydrate and water at the weight ratio of 1:1 for standby application; (4) 3%-5% of binder and 0.5%-1.5% of magnesium chloride solution are added in the mixture, mixing is carried out by an edge runner mill for 100-150 s, and a pellet material is made; (5) the pellet material is put into a ball press machine to achieve cold-press formation, the diameter of the pellets is 45-55 mm*30-40 mm *20-30 mm, and the pellets are naturally stacked and aired. The cold-pressed pellets manufactured through the method have the advantages that the pellet forming rate is high, the bonding strength is large, the drying time is short after pellet formation, and use for steelmaking is convenient.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for making cold-pressed pellets for steelmaking. Background technique [0002] Dust is generated during the smelting process of iron and steel enterprises, and the dust is collected by a dust collector and becomes dust. The comprehensive use of dedusting ash has always been an important topic in the research of circular economy. Under the current circumstances, the processing methods of dust removal include returning to the sintering system for reuse and making cold-pressed pellets. Making cold-pressed pellets is a better environmental protection treatment method for dust removal, which can better solve environmental problems and achieve the purpose of saving energy and reducing consumption. Compared with the method of returning to the sintering system to make cold-pressed pellets by using dust removal ash for reuse, the problem of dust in the sintering...

AI Technical Summary

Problems solved by technology

At present, most of the cold-setting pellet production uses bentonite and cement as binders, which not only have poor strength in the early stage, low pelleting rate, and long maintenance period, but also in the later use process, the steelmaking system produces a large amount of waste residue, which makes the post-processing cause certain difficulties