A kiln device and method for multi-tubular direct reduced iron

Abstract

The invention relates to a kiln device and a method for directly reducing iron in multiple pipes. A screw mechanism is arranged in the reduction pipe of the kiln device; the screw mechanism is driven by a screw driving device and comprises a shaftless screw piece and a screw blade duct; the screw mechanism is capable of pushing materials to be reduced to go forward slowly, and meanwhile, continuously rolling over the materials to be reduced, so that the materials to be reduced can be reduced more thoroughly and in a more balanced manner; in addition, mutual sticking between metallized pellets can be prevented, the grade and the density stability after reduction can be ensured, and meanwhile, the reduction time of the reduced materials is guaranteed and a thorough reduction reaction is guaranteed. The kiln device and the method are applicable to all ferrous materials such as low-grade difficultly separated ores, compound ores and ferrous wastes, and are low in requirements on reduction coal and high in selectivity.

Description

technical field [0001] The invention relates to a kiln device and method for reducing iron, in particular to a kiln device and method for directly reducing iron, and belongs to the technical field of black metallurgy. Background technique [0002] China is the world's largest crude steel producer. In 2014, the steel output exceeded 800 million tons, and the annual demand for steel scrap (including reduced iron) was more than 28 million tons, of which the demand for reduced iron was 5 million tons. my country imports 3 million tons of reduced iron annually, but the annual output of reduced iron (sponge iron) is only 500,000 tons, less than 1.0% of the world's total output of direct reduced iron, and belongs to one of the countries with the lowest reduced iron production in the world. As the national iron and steel industry's environmental protection requirements for energy saving, emission reduction and carbon reduction are becoming more and more stringent, it is required to ...

AI Technical Summary

Problems solved by technology

[0006] For the above-mentioned reduced iron methods, the investment for each production line is tens of millions to hundreds of millions. At the same time, there are also defects such as high energy consumption and difficult operation, which restrict investors from entering the reduced iron industry.

[0007] In the field of reduced iron in China, private enterprises are basically investing in development, there are investment risks, and there is a lack of high-level technical personnel.

Images