Preparation method of composite cold-pressed pellets for converter steelmaking

Abstract

The invention belongs to the technical field of composite cold-pressed pellets, and discloses a preparation method of composite cold-pressed pellets for converter steelmaking. According to the technical scheme, the preparation method comprises the following steps of uniformly mixing 5-15 parts by mass of steel rolling oil sludge, 5-15 parts by mass of steelmaking sludge and 2-8 parts by mass of organic acid, and standing the mixture for 20-60 minutes at 20-60 DEG C to obtain a primary uniformly-mixed material; adding 15-25 parts by mass of iron oxide scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of fly ash into the primary uniformly-mixed material, and carrying out stirring to obtain a secondary uniformly-mixed material; and carrying out pressure forming on the secondary uniformly-mixed material, and carrying out drying until the moisture content is less than 2wt%, so as to prepare the composite cold-pressed pelletz. The preparation method of the composite cold-pressed pellets for converter steelmaking has the characteristics of simple process, low production cost, no special requirements on equipment and capability of reducing environmental pollution, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.

Description

technical field [0001] The invention belongs to the technical field of composite cold-pressed pellets. In particular, it relates to a method for preparing composite cold-pressed pellets for converter steelmaking. Background technique [0002] Iron and steel enterprises will produce a large amount of iron-containing dust and sludge in the production process, including various dust removal ash, blast furnace gas sludge, iron oxide scale, steelmaking sludge and steel rolling sludge, etc. These iron-containing dusts have complex types and high iron content, and have certain recycling value. At present, the main utilization method of this kind of iron-containing dusts is extensive return sintering, but the excessive addition of these iron-containing dusts will reduce the Sinter quality, damage to sinter equipment. In particular, steel rolling oil sludge and steelmaking sludge have a huge output, accompanied by stench, and are difficult to handle. At present, the treatment meth...

AI Technical Summary

Problems solved by technology

This process uses a large amount of binder in the process of producing pellets, and the production cost is high

[0006] To sum up, the current recycling process of iron-containing dust and sludge has the problems of high environmental pollution, high equipment requirements and high production costs due to the addition of a large number of binders, except for direct return to sintering.