A kind of sintering method of layered cloth after fuel pre-screening

Abstract

The invention discloses a sintering method capable of achieving layered distribution after fuel pre-screening. Iron ore powder, return fines, a fluxing agent and solid fuel are taken as main raw materials needed by sinter burdening. The sintering method comprises the steps that firstly, the iron ore powder, the return fines and the fluxing agent are mixed to obtain primary mixtures; secondly, partof the solid fuel is screened and mixed with the unscreened solid fuel and the primary mixtures, and secondary mixtures containing part of the solid fuel with the large particle size and part of thesolid fuel with the small particle size are obtained; and thirdly, the secondary mixtures containing part of the solid fuel with the small particle size and part of the solid fuel with the large particle size are sequentially laid in the cloth sintering process, and then igniting is conducted for sintering. According to the sintering method capable of achieving layered distribution after fuel pre-screening, the uneven particle size caused by cloth segregation is reduced by improving particle size distribution of the sintering material layer fuel, therefore, heat on the upper portion and the lower portion of a sintering material layer is distributed evenly, the combustion zones on the upper portion and the lower portion are moderate, the yield of sintered ore can be significantly increased,the quality of the sintered ore can be significantly improved, and consumption of the solid fuel in the sintering process can be effectively reduced; and in addition, a related preparation sinteringtechnology is simple, convenient to operate and suitable for application and popularization.

Description

technical field [0001] The invention belongs to the technical field of iron ore sintering, and in particular relates to a sintering method for layered distribution of fuel after pre-screening. Background technique [0002] The sintering process accounts for about 12% of the total energy consumption of steel production, of which about 80% of solid fuel is used in the sintering process. Combustion of solid fuel will produce a large amount of sulfide and nitrate, causing serious pollution to the environment. [0003] Due to segregation during the sintering process, the particle size of the solid fuel becomes coarser from top to bottom along the height of the material layer. The particle size of the fuel in the upper part of the material layer is relatively small, and the particle size of the fuel in the lower part of the material layer is relatively large. The particle size of the fuel directly affects the thickness of the sintering combustion zone: if the particle size is to...

AI Technical Summary

Problems solved by technology

[0004] In addition, the existing sintering process usually adopts draft sintering technology, and the draft sintering process with internal fuel will inevitably produce heat storage, resulting in insufficient heat in the upper part of the sintered material layer and excess heat in the lower part

The unevenness of heat in the upper and lower parts of the material layer will not only affect the quality of sintered ore, but also cannot make full use of heat