Method for efficiently using converter precipitator dust

Abstract

The invention discloses a method for efficiently using converter precipitator dust, belongs to the technical field of converter steel making methods, and is used for efficient reuse of the precipitator dust. The method is characterized in that the precipitator dust is added along with a chute in the process of extracting vanadium to discharge from semisteel; when the vanadium is extracted to discharge from the semisteel by 1 / 5, a secondary dust removing valve is opened; the chute rotates to add the precipitator dust by one time or two times; after the precipitator dust is added, the precipitator dust is accelerated to melt through front-back movement; the dust removing valve is recovered to a normal state; and after the semisteel is discharged, the iron mixing for converter steel making is prepared. The precipitator dust totally covers the liquid surface of the semisteel to achieve the effect of inhibiting the smoke discharge; the pecipitator dust is molten in a semisteel ladle to form slag to improve the difficulties of making steel slag by the semisteel; and the problems of non-ignition of a converter and explosion venting of an electric field in direct returning of the precipitator dust along with waste steel are solved. The method is an initiate in converter steel making, solves the problem, of capability of effectively using the precipitator dust, not thoroughly solved for a long time, and has the advantages of short flow, high metal yield and low cost.

Description

Technical field [0001] The invention relates to a method for efficiently reusing dust ash in steelmaking production, and belongs to the technical field of converter steelmaking methods. Background technique [0002] Converter dust ash is a solid waste produced in the steelmaking production process, containing FeO, CaO, Fe 2 O 3 , SiO 2 , And other components, especially the dust ash of semi-steel steelmaking, which contains high iron and calcium oxide, and produces about 30kg per ton of steel. It is a secondary iron-containing resource. FeO-CaO base has high utilization value for steelmaking. Due to its high temperature and small particles, dust removal ash is difficult to comprehensively utilize, especially the use of converter fine ash. At present, major steel plants have many ways to recycle and reuse the dust removal ash, most of which are to return the dust removal ash to sintering for batching. However, the return sintering process has the disadvantages of long process and ...

AI Technical Summary

Problems solved by technology

Due to its high temperature and small particle size, it is difficult to comprehensively utilize dust removal ash, especially the utilization of converter fine ash.

At present, there are many ways for major steel mills to recycle the dedusting ash, most of which are to return the dedusting ash to sintering for batching, but returning to sintering has the disadvantages of long process and low yield of beneficial elements; some enterprises also use dedusting ash as a The main material is processed and reused after adding certain materials in different proportions according to the purpose, which solves the shortcomings of long process and low yield, but has high processing costs and does not use low-cost production; The use of dephosphorization outside the furnace to replace fine iron powder is a low-cost recovery method, but it is difficult to match the recovery volume with the production volume, and it is easy to cause a backlog of dust removal ash, which is not conducive to production connection; some dust removal ash is directly added with scrap steel, The process is short and the cost is low, but it makes it difficult to start blowing and igniting the converter, and part of the dust removal dust in the early stage of blowing is sucked away by the fan, which increases the dust content in the early stage smoke and dust, and brings certain pressure to the electric field dust removal

At present, these recycling methods have different degrees of cost pressure, recycling efficiency problems, steelmaking production problems, etc., which have always been difficult problems for iron and steel enterprises and need to be solved urgently