Technique for producing cold-bonded pellets from steel converter dust removal ash

Abstract

The invention discloses a technique for producing cold-bonded pellets from steel converter dust removal ash, which comprises the following steps: separately collecting rough dust removal ash and fine dust removal ash of the steel converter, weighing iron scale, rough dust removal ash and fine dust removal ash in a mass ratio of (10-50):(20-80):(20-70), and uniformly mixing; adding the mixture into a magnesium chloride solution, and uniformly mixing, wherein the magnesium chloride solution accounts for 1-20 wt% of the total mass; and pelletizing with a pelletizer, stripping, and naturally solidifying to obtain the cold-bonded pellets. The dust removal ash does not need previous digestion treatment with water, thereby saving abundant water resources; the production technique is simple and feasible, and is implemented only by proportionally adding the inorganic weakly-alkaline binder into the iron scale, rough dust removal ash and fine dust removal, uniformly mixing and pelletizing; by using the inorganic weakly-alkaline binder, the finished cold-bonded pellets have the advantages of fewer impurities, low SiO2 content and high total iron content (not lower than 60%); and abundant cold-bonded pellets can be used in the steelmaking process, and the steelmaking process is not influenced by the addition amount.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of dedusting ash produced in the converter smelting process, and in particular relates to a process method for producing cold-set pellets from the dedusting ash of a steelmaking converter. [0002] Background technique [0003] During the converter smelting process, 2% of the raw and auxiliary materials added to the furnace will be converted into dust, which is converter dust. The amount of converter dust generated is about 20kg / t steel. The dust is mainly composed of iron oxide, and the mass fraction of iron oxide is 70-95%. The remaining 5-30% of the dust consists of oxide impurities such as calcium oxide and other metal oxides (mainly zinc oxide). Other compounds in steelmaking dust are iron-zinc spinel, iron-magnesium spinel, calcium carbonate and carbon. Steelmaking dust contains high iron and few harmful impurities. If it is discarded, it will not only occupy a large area of...

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Problems solved by technology

The dust is a fine powder with a particle size of 35-200 mesh. If it cannot be recycled, it will cause secondary pollution during transportation and stacking.

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