Sintering method and system adopting sintering return ore as embedded material

Abstract

The invention relates to a sintering method and system adopting a sintering return ore as an embedded material. The method at least comprises the steps of preparing the embedded material, directly conveying the obtained embedded material to the tail part of a secondary mixing machine in a sintered material pelleting workshop, and uniformly mixing. The system comprises a return ore coarse grain screening unit and a conveying unit, wherein the return ore coarse grain screening unit is used for further screening and grading the separated sintering return ore so as to obtain a coarse grain-gradedreturn ore; and the conveying unit is used for directly feeding the coarse grain-graded return ore obtained through screening to the tail end of a secondary cylinder mixing machine. By adopting the adding system using the sintering return ore as the embedded material designed by the process and the device provided by the invention, the coarse grain-graded return ore is directly added to the tail end of the secondary cylinder mixing machine, so that internal transfer and cycle facility construction and equipment investment can be reduced, and the operation and maintenance cost is further saved;meanwhile, the coarse grain-graded return ore does not participate in the pelleting process, so that mixture pellets are protected, the filling rate of the mixing machine is reduced, the processing efficiency in unit volume is improved, and a mixture pelleting effect is improved; and in addition, the sintering return ore is not easy to be wrapped by adhered particles and is uniformly embedded into the mixture so as to achieve a material layer support effect, so that the air permeability of a material layer can be improved, and a sintering effect can be improved.

Description

Technical field [0001] The invention relates to a metallurgical process and equipment, in particular to a sintering method and system using sintering returned ore as an embedded material. Background technique [0002] Because the iron and steel metallurgical sintering process has automatic heat storage characteristics, thick material layer sintering can reduce the amount of solid fuel added, strengthen the oxidizing atmosphere of the sinter material layer, improve the quality of sinter, increase the yield of sinter, and realize energy saving in sintering The purpose of reducing consumption and increasing production efficiently. Therefore, it has been widely concerned and used by domestic and foreign sintering enterprises. At present, the thickness of the sintered material layer of domestic large and medium-sized sintering machines is generally above 700mm, and some have reached or exceeded 800mm. [0003] Although thick material layer sintering has many advantages, blindly increa...

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Problems solved by technology

[0003] Although thick material layer sintering has many advantages, blindly increasing the material layer thickness will increase the air flow resistance of the material layer, the negative pressure of the fan will be too high, the air leakage of the sintering machine will increase, the effective air volume of the material surface will be insufficient, and the productivity will not increase but will decrease.

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