Selection method of enriched graphite in steelmaking desulfurization slag

Abstract

The invention belongs to the technical field of steelmaking, and particularly relates to a method for selecting enriched graphite in steelmaking desulfurization slag. The method comprises the following steps of A, treatment of desulfurization slag; B, collection of dust containing enriched graphite; and C, improvement of the concentration of the enriched graphite. In the step A, the treatment of the desulfurization slag comprises the steps of water atomization spraying, cooling pulverization and vigorous screening, in the step B, the collection of the dust containing the enriched graphite comprises the steps of negative pressure screening, cyclone gathering and bag removing; and in the step C, the improvement of the concentration of the enriched graphite comprises the steps of water washing ball milling and sand grinding flotation. A traditional hot splashing process is replaced by a spraying pulverization technology, and the red slag differentiation efficiency is greatly improved compared with an existing common hot splashing process, and the water consumption is saved by 40% or more; the differentiation rate is increased, and the water consumption is reduced; and the recovery ofthe enriched graphite is increased, the economic benefit is improved, and the secondary pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for selecting enriched graphite in steelmaking desulfurization slag. Background technique [0002] At present, in the domestic steelmaking process, the sulfur element in molten iron is generally desulfurized by the KR method (adding quicklime to stir) and the injection method (injecting passivated metal magnesium particles). The desulfurization slag produced after the operation will contain A certain amount of enriched graphite. [0003] We found that the current domestic desulfurization slag treatment method is as follows: firstly use the hot desulfurization method to reduce the temperature and pulverize the hot desulfurization slag, then use a vigorous sieve to sieve large slag steel with a diameter of more than 50; The underscreen material is mixed with ordinary steel slag and then enters the crushing magnetic separation production line to select iron...

AI Technical Summary

Problems solved by technology

[0003] We found that the current domestic desulfurization slag treatment method is as follows: firstly use the hot desulfurization method to reduce the temperature and pulverize the hot desulfurization slag, then use a vigorous sieve to sieve large slag steel with a diameter of more than 50; The underscreen material is mixed with ordinary steel slag and then enters the crushing magnetic separation production line to select iron elements (including granular steel and steel fine powder), and the graphite-containing tailings are mixed with steel slag tailings and then discharged and discarded, resulting in waste of resources and Secondary pollution of the environment

[0004] Among the existing treatment methods, ordinary heat-splash pulverization has poor effect and consumes a lot of water; enriched graphite as available graphite resources cannot be effectively recycled, resulting in loss of economic benefits and secondary pollution of the environment

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