An experimental device for studying the reaction of fine ore in motion

Abstract

The invention relates to an experimental device for studying the reaction of powdered ore in motion. It includes: a tubular shaft furnace. The reaction furnace tube is arranged in the furnace of the tubular shaft furnace; the feeding tube slides from the top of the tubular shaft furnace. It extends into the reaction furnace tube sealingly, and the position of its discharge port in the reaction furnace tube is movable; the material receiving pipe extends from the bottom end of the tubular shaft furnace into the reaction furnace tube slidingly and sealingly, and its material receiving port The position in the reaction furnace tube is movable; so that there is a constant temperature zone with adjustable position and / or length between the discharge port and the material receiving port. The ore powder enters the constant temperature zone through the discharge port of the feeding tube. After the reaction, it passes through the connection port. The material port enters the material receiving pipe. The invention enables the mineral powder to react during the movement of the constant temperature zone, and through adjustment and selection, the temperature difference in the constant temperature zone can be made smaller.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to an experimental device for studying the reaction of fine ore in motion. Background technique [0002] Due to the natural fragility of most iron ores, a large amount of fine ore is often produced during the mining, crushing and screening of iron ore. Therefore, fine ore accounts for a large proportion of the iron ore in the world. Big. In addition, for some low-grade iron ores, in the smelting process, they will also be first made into fine ore. For example, some low-grade iron ores found in China, North America and Russia need to be crushed into fine powder first, and then go through the beneficiation process to obtain concentrate particles with acceptable grade levels. The obtained concentrate particles generally have a size of less than 0.15 mm. [0003] In the traditional ironmaking process, powdered ore needs to be sintered or pelletized to be processed into large-sized...

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Problems solved by technology

Among them, the first two methods cannot avoid the bonding phenomenon of fine ore particles at high temperature, while the tubular dripping furnace method avoids the mutual bonding of molten fine ore particles by flying a small amount of fine ore through the constant temperature zone.

But the application of tube dripping brings another problem at the same time: how to get a constant temperature zone with small temperature difference

The former tube-type dripping furnace has a relatively low temperature and a large temperature difference between the parts above the constant temperature zone and below the constant temperature zone in the furnace, so it has a greater impact on the research results of the isothermal method; although the latter one uses water-cooled feeding tubes and water-cooled +Air-cooled feed pipe prevents fine ore from reacting in the uneven temperature area at both ends of the furnace, but the water-cooled equipment takes away a lot of heat in the furnace, especially due to the high cooling intensity of water-cooled+air-cooled feed pipe, close to The temperature at the upper end of the water-cooled + air-cooled feed pipe is much lower than when the water-cooled + air-cooled feed pipe is not used. Therefore, there is still a very large temperature difference in the constant temperature area in this set of equipment, which has great influence on the accuracy of the experimental results. big impact

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