Sintering production method with grate-layer material layer thickness adjustable

Abstract

The invention relates to the field of sintering ore production, in particular to a sintering production method with the grate-layer material layer thickness adjustable. The sintering production methodcomprises the steps of sinter burdening, mixing pelletizing, distribution, ignition for sintering, cooling and breaking, and screening; on the basis that a sintering ore finished product meets the requirements that the basicity R is 1.8-2.0 and the TFe content is 54.5%-57.0%, the weight parts of the raw materials are controlled to be 70 parts of a limonite mixture, 11-18 parts of blast furnace return mines, 9-16 parts of sintering machine return mines, 0-0.3 part of fly ash, 0-2 parts of gravity ash, 5-6 parts of dolomite powder, 7-9 parts of white ash, and 4.5-6 parts of fuel. The grate-layer material layer thickness is adjusted online, the sinter bed thickness can be increased, the conditions of mixing pelletizing, ignition for sintering and cooling are optimized and changed, and thus the automatic heat storage effect of a sinter bed is enhanced, the sintering breathability can be improved, and the quality and output of sintering ores are increased.

Description

Technical field [0001] The invention relates to the field of sintered ore production, in particular to a sintered production method for adjusting the thickness of a bottom layer. Background technique [0002] In recent years, in accordance with the requirements for the development of large-scale blast furnaces in the country, iron and steel enterprises have eliminated blast furnaces below 1,000 m³ and built blast furnaces above 1,000 m³. However, in the production process, sintering production cannot meet the production needs of newly-built blast furnaces, which restricts blast furnace production. Major steel companies increase the sintering capacity by increasing the thickness of the sintered material layer, but most of the time the thickness of the sintered material layer is only 750mm-850mm. Later, individual companies began to use the material layer above 900mm as the research direction and achieved certain results. The output of sintered ore has been increased. For example, ...

AI Technical Summary

Problems solved by technology

[0002] In recent years, in accordance with the requirements of the large-scale development of the national blast furnace, iron and steel enterprises have eliminated blast furnaces with a size of less than 1000m³ and built new blast furnaces with a size of more than 1000m³. , the major iron and steel enterprises increased the sintering production capacity by increasing the thickness of the sintering layer, but most of the time the thickness of the sintering layer was only 750mm-850mm. The increase of sinter output has been realized. For example, the Chinese invention patent with the notification number of CN103215443B discloses a high ore ratio limonite sintering process. 20mm from the material to the thickness of the bottom layer; the Chinese invention patent that the notification number is CN104726696B discloses a kind of sintering production method of the thick material layer with medium alkalinity, the thickness of the material layer is 900mm-1000mm, the thickness of the bottom layer is 100mm, and the bottom layer is not pressed; but this At that time, the operation of sintering thick material layer encountered a bottleneck, because the height of the sintering material surface was equal to the height of the sintering trolley railing, and there was no room for increasing the thickness of the sintering material layer. Impact of research on increasing bed thickness while siding heights are equal

[0003] However, after the state put forward the policy of restricting the production of iron and steel enterprises, the number of sintering machines started and shut down increased. In order to meet the normal production of blast furnaces, enterprises urgently need to increase the output of sintered ore. Layer permeability, avoiding the production of sintered raw materials, and improving the yield of sintered ore