Method for producing starting material for sintering

Abstract

Provided is a method for producing a starting material for sintering, wherein it is possible to improve productivity compared to conventional methods by effectively using high-carbon dust during the process in which the surfaces of preliminary particles are being covered with a solid-fuel-based powder starting material. When the surfaces of the preliminary particles are being covered with a solid-fuel-based powder starting material, a solid-fuel-based powder starting material containing 5 to 40 mass% of high-carbon dust is used as the solid-fuel-based powder starting material.

Description

technical field [0001] This invention relates to the manufacturing method of the raw material for sintering used when manufacturing sintering ore using the DL type sintering machine (Dwight-Lloyd sintering machine) of a downward suction type. Background technique [0002] The sintered ore to be charged into the blast furnace is generally manufactured as follows. [0003] First, the raw materials roughly classified into the following (a) to (d) are put into a tumble mixer, then added with an appropriate amount of water, mixed and granulated to produce granular raw materials for sintering. [0004] (a) Iron ore (ore, return ore) [0005] (b) SiO containing silica, serpentinite, nickel slag, etc. 2 raw material [0006] (c) Limestone raw material powder containing CaO such as limestone [0007] (d) Coke powder, anthracite, and other solid fuel raw material powders used as heat sources [0008] Raw materials for sintering, including granulated particles formed by mixing and...

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Problems solved by technology

[0017] However, such technology may also cause the following problems: in reducing CO 2 In the case of reducing the coke powder as a solid fuel raw material powder based on the requirements of the company, the coating amount of the coke powder will decrease, and a sufficient effect cannot be obtained.

[0023] However, the fuel for sintering produced by the method described above is broken when mixed with other sintering raw materials in a tumble mixer due to the weak strength of individual particles. When the packed bed is formed on the trolley, the mixed presence / existence of fine coke in the packed bed may occur

Therefore, when the so-called "sintering operation" is performed by igniting in this state, there is a problem that uneven combustion occurs in the sintering machine, and ideal operation cannot be performed.

[0024] In addition, because the fine powder coke produced by CDQ is in a dry state, dust will be generated during processing. On the other hand, since the fine powder coke produced in the wet fire extinguishing device is in a wet state, it needs to be reused after adding a drying process. Both of them have the disadvantage of increasing the cost of treatment and drying for reuse.

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