A kind of ultra-thick material layer sintering production method

Abstract

The invention discloses a super-thick bed layer sintering production method. The super-thick bed layer sintering production method is characterized in that during sintering production, material distribution is performed twice, ignition is performed twice, and carbon-containing pellets are added after first material distribution and before first ignition as well as after second material distribution and before second ignition; the thickness of the mixture distributed for the first time is 600-800 mm, the carbon-containing pellets are added into the mixture distributed onto a sintering machine for the first time, the quantity of the carbon-containing pellets added around the mixture is 1-2 times of that of the carbon-containing pellets added into the middle of the mixture, and ignition and down draft sintering are performed; second material distribution is performed after the sintering lasts for 10-25 minutes, the material distribution thickness is 400-600 mm, the carbon-containing pellets are added into the sintering mixture distributed for the second time, the quantity of the carbon-containing pellets added around the mixture is 1-2.5 times of that of the carbon-containing pellets added into the middle of the mixture, and the second ignition and down draft sintering are performed. The super-thick bed layer sintering production method has the advantages that the upper mixture and the lower mixture are sintered at the same time, and the bed layer thickness can be increased to 1.3-1.4 m; the heat supply and mineralization time of the upper and peripheral bed layers are optimized, sinter quality can be improved, and solid fuel consumption is lowered.

Description

technical field [0001] The invention belongs to the technical field of ironmaking production, relates to sintering production technology, in particular to a sintering production method of an ultra-thick material layer. Background technique [0002] During the sintering production process, after the sintering mixture cloth is ignited on the trolley, it is sintered from the surface to the interior from top to bottom by the exhaust fan, and the sintering is completed from the surface to the surface of the trolley grate. Thick bed sintering is an important and widely used sintering technology, which has the advantages of improving sinter strength and reducing sintering fuel consumption, but the application of thick bed sintering technology also faces some difficulties. [0003] As the thickness of the sintering material layer increases, the airflow resistance through the material layer increases, and the sintering speed slows down, which not only increases the power consumption ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a sintering production method with an ultra-thick material layer, optimize the heat distribution and mineralization time of the upper and edge sintered material layers, solve the problem of insufficient heat supply for the upper and edge sintered material layers, increase the thickness of the sintered material layer, Increase the strength of sintered ore, reduce sintered solid fuel consumption and return rate