Process for production of reduced iron
A manufacturing method and technology for reducing iron, applied in the direction of furnace types, furnaces, hearth furnaces, etc., can solve the problems of reduced productivity, reduced productivity of metallized particles, and significant loss of refractory materials, and achieve reduced raw and fuel costs and high operating efficiency. Effects on sex and productivity
Active Publication Date: 2013-06-26
NIPPON STEEL CORP
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Problems solved by technology
At such a high temperature, there are problems such as significant loss of refractory materials in the furnace, high energy per unit required for heating, and further reduction in productivity.
In this case, the productivity of metallized particles drops significantly
Method used
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[0053] Next, an example of the present invention will be described, but the conditions of this example are an example of conditions adopted to confirm the feasibility and effect of the present invention, and the present invention is not limited to this example of conditions. The present invention can adopt various conditions as long as the gist of the present invention is not exceeded and the object of the present invention can be achieved.
[0054] (Example)
[0055]For raw materials mixed with various dusts containing various slag components, the coal (mol% O / mol%C=1), and the 80% particle size under the sieve is 120 μm. Furthermore, the addition amount and particle diameter of quicklime (CaO) or calcined magnesite (MgO) were changed, it mixed, and it molded into the briquette which differed in the amount and composition of slag. These agglomerates are dried and loaded into a rotary hearth with a diameter of 20m for operation. The temperature in the furnace is controlled...
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Abstract
A process for the production of reduced iron by drying compacts, which are obtained by compacting an iron oxide-based raw material containing a carbonaceous reducing material requisite to the reduction, and then charging the dried compacts into a reducing furnace to conduct reduction and thus obtain a reduced iron comprising both metallic iron and a mixture of slag components. In compacting the raw material, at least either of a CaO-base oxide-type modifier and an MgO-base oxide-type modifier is added to the raw material. Further, the total content of CaO, SiO2, MgO and Al2O3 in the compacts is adjusted to 8 to 20mass% of the total mass of the compacts exclusive of the carbonaceous reducing material, while the slag basicity, (CaO% + MgO%) / SiO2%, which is calculated by using the contents (mass%) of the slag components in the compacts, is adjusted to 0.9 to 3.0
Description
technical field [0001] The present invention relates to a method for producing reduced iron, which efficiently produces reduced iron with high operability and productivity without melting the reduced iron, using a molded body obtained by mixing iron oxide-based powder raw materials and reducing materials such as coal . [0002] This application uses Japanese Patent Application No. 2008-093344 and Japanese Patent Application No. 2008-306789 as basic applications, and the contents thereof are incorporated herein. Background technique [0003] It is known that a carbonaceous reducing material and moisture are blended and mixed with dust powder containing a large amount of iron oxide (powdered iron raw material) produced in iron and steel making processes, and molded into a granular or agglomerated molded body , and then dry the molded body and put it into a reduction furnace for heating to produce reduced iron. [0004] In addition, in recent years, due to concerns about reso...
Claims
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IPC IPC(8): C21B13/10C22B1/16C22B1/244
CPCC22B5/10C22B1/245C21B13/0046C21B13/105
Inventor 泽井隆桑内祐辉佐藤毅典永井涉福田和久大贯一雄
Owner NIPPON STEEL CORP