A method for producing ferrite pre-sintered material by using steelmaking dry dust removal fine ash

Abstract

The invention relates to a method for producing a ferrite pre-sintering material through steelmaking dry dedusting fine ash. The method includes the steps that (1) the steelmaking dry dedusting fine ash is evenly mixed, levigated and screened to be made into dedusting fine ash with the average grain diameter D50 being smaller than 10 microns; (2) the screened dedusting fine ash is subjected to slurry mixing and stirring dispersion in water, and a magnetic separator is used for conducting magnetic separation and impurity removal; (3) the dedusting fine ash which is subjected to magnetic separation is pelletized and dried; (4) roasting oxidation is carried out in a heating furnace, so that iron oxide red is obtained; (5) the iron oxide red, strontium carbonate and additives are allocated in proportion into an evenly-mixed material, the evenly-mixed material is subjected to coarse mixing by a double-stirring strong mixing machine first, and then secondary fine mixing is conducted through a dry roller type ball mill; the evenly-mixed material which is subjected to secondary fine mixing is used for preparing the ferrite pre-sintering material through an existing technology. The ferrite pre-sintering material produced through the method is stable in quality, even in ingredient and good in magnetic property; the preparation cost of the ferrite pre-sintering material is lowered, and the environmental pollution caused by steelmaking dedusting ash is effectively reduced.

Description

technical field [0001] The invention relates to a treatment process for dry dust removal and fine ash in steelmaking, in particular to a method for producing ferrite pre-sintered material by using dry dust removal in steelmaking. Background technique [0002] In the prior art, the raw materials for preparing ferrite calcined material mainly include rolled steel scale and acid regenerated iron red. The rolled steel scale is a by-product of hot-rolled carbon steel. Hydrochloric acid after washing recovers the by-products in the regeneration process. The main production process is: rolled steel scale or acid regenerated iron red + strontium carbonate - mixing - drying - pre-calcination - pulverization - ferrite pre-calcination. Rolled steel scale and acid regenerated iron red raw materials are expensive, single-sourced, and have small resources, which are not suitable for large-scale production of ferrite calcined materials. On the other hand, a large amount of flue gas is gen...

AI Technical Summary

Problems solved by technology

At present, the main utilization methods of steelmaking dry dust removal include hot briquetting, cold briquetting, shaft furnace pellet addition, and sintering batching, but there are problems of low added value and difficult utilization in industrial utilization; and with the iron and steel industry With the rapid development of steelmaking dust, the output of steelmaking dust is increasing day by day, and the environmental pollution is becoming more and more serious. It is urgent to develop a new treatment process suitable for the dust characteristics of dust removal.

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