Sponge iron production method

Abstract

The manufacture method for sponge iron, which comprises following steps: (1) preparing iron powder into oxidation ball groups; (2) putting said ball group, desulfurizer and fuel gas coal into metal reaction tank with heat-resisting steel pipe with diameter as 50mm; arranging sixteen tanks on one kiln car as 4 X4 square array with least 150mm distance between each other; (3) calcining with coal gas prepared by two mixed gas producers with diameter as 3m, wherein, one for production and another for standby; cooling; moving backward and clearing the tank. This method has low cost, high production quality and rapid reaction speed. The reaction tank has well performance, too.

Description

Technical field [0001] The present invention belongs to the technical field of iron smelting, and specifically relates to a production method of sponge iron. The international patent classification number is C21B 13 / 04. Background technique [0002] At present, the production methods of sponge iron can be divided into two categories. One is the gas-based method, which accounts for more than 85% of the total production of sponge iron. The gas-based method generally refers to the reduction of iron by cracking natural gas into a reducing atmosphere. Reduction of ore or man-made lump ore to produce reduced iron; the main condition of the gas-based method for the production of sponge iron is to have abundant natural gas. In areas where natural gas is scarce, the gas-based method cannot be used, but another production method— —Coal-based method; coal-based method is to use coal as a reducing agent to directly reduce iron ore. Coal-based direct reduction is now mainly represented by rot...

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Problems solved by technology

[0002] At present, the production methods of sponge iron can be divided into two categories, one is the gas-based method, which accounts for more than 85% of the total output of sponge iron. The reduction of ore or artificial lump ore produces reduced iron; the leading condition for the production of sponge iron by the gas-based method is to have abundant natural gas. In areas where natural gas is scarce, the gas-based method cannot be used, and another production method- - Coal-based method; coal-based method is to use coal as a reducing agent to directly reduce iron ore. The direct reduction of coal-based method is now mainly represented by rotary kiln, and there are some other direct reduction processes of coal-based method; although the rotary kiln method The production capacity is relatively large, but there are also shortcomings such as large one-time investment, high energy consumption, easy ring formation, and difficult operation and control. It is not suitable for small and medium-sized enterprises; while other coal-based direct reduction processes such as ordinary tunnel kilns use Fine powder and reducing agent (coal) are layered into clay tanks or silicon carbide tanks, put on a trolley and pushed into a tunnel kiln for roasting. The heat source is a hand-fired coal furnace. Although this method has a small one-time investment , but there are also many undesirable results, specifically:

[0003] 1. The heat transfer efficiency of the reaction tank is low, the reduction time is long, the production capacity is low, and the economic benefit is poor;

[0004] 2. The product quality is unstable;

[0005] 3. Heavy industrial pollution;

[0006] 4. After the reduction tank is damaged, it cannot be recycled, resulting in high production costs

[0007] CN1142541A announced that the ramp furnace for metal can rolling and reducing raw materials cannot overcome the fracture of the can body at high temperature and the phenomenon of can jamming during production, and cannot realize continuous production;

[0008] In addition, the iron powder and reducing agent used in the prior art are separated into the tank. Due to the large thickness of the iron ore powder, the contact area between the reducing agent and the iron ore powder is small, the reduction penetration is difficult, and the reduction speed is slow, which affects the production volume. , the economic benefit is not good

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