Bottom blowing reduction device and reduction method using device

Abstract

The invention provides a bottom blowing reduction device. The bottom blowing reduction device comprises a furnace body, a feed port, a discharge port, a reduction gas inlet and a reduction gas outlet;the furnace body is transversely arranged, and forms a certain included angle with the horizontal direction; in the length direction of the furnace body, a gas cavity and a material cavity are formedin the furnace body; the gas cavity and the material cavity are separated by a porous plate; the feed port is formed in one higher end of the furnace body; and the reduction gas inlet and the reduction gas outlet both communicate with the gas cavity. The invention further provides a method for bottom blowing reduction by using the device; and materials to be reduced are fed in the material cavityfrom the feed port, slowly move downwards along the inclined furnace body under coaction of the gravity and the reduction gas, and are finally reduced and output from the discharge port. The method has no need to use a push rod or a conveying belt for driving a boat container to move, so that the boat container and a conveying device are omitted.

Description

technical field [0001] The invention relates to the technical field of metallurgical equipment, in particular to a bottom blowing reduction device and a reduction method using the device. Background technique [0002] Metals in nature are mainly oxides and sulfides. The extraction of these metals generally goes through a process of enrichment, transformation and separation, such as ore dressing, pyrometallurgy, and hydrometallurgy. Metals that exist in the form of sulfides generally need to be calcined to form oxides. Whether it is a natural oxide or an oxide obtained by roasting, after purification, a reduction process is basically required to obtain pure metal powder, which becomes the raw material for the preparation of metal products. There are two main methods of reduction: one is solid-solid reduction, such as reducing iron powder with carbon powder; the other is gas-solid reduction, such as reducing molybdenum oxide and tungsten oxide with hydrogen, and reducing cop...

AI Technical Summary

Problems solved by technology

From the overall process, there are four problems; the first is that the yield loss is relatively large due to the existence of two-stage reduction and two screenings, and the total yield does not exceed 98%; The secondary temperature rises and falls, which consumes a lot of energy; the third is that the two-stage reduction requires hydrogen to enter and exit twice, and most of the reduction equipment is not equipped with a hydrogen recovery system, resulting in a large loss of hydrogen

Fourth, the production efficiency is low, and a complete molybdenum powder reduction process takes more than 20 hours

If the production efficiency is only improved under the existing technology and equipment conditions, lengthening the reduction zone is a better choice, but it will lead to an increase in the number of pushing boats, increased resistance, and a significant increase in the power of the push rod and the stress on the boats.

For the rotary or mesh-belt reduction, although the influence of the boat structure on the reduction atmosphere of the powder micro-region is weakened compared with the boat reduction, it does not solve the problem of the coexistence of the reducing gas and the water vapor generated by the reaction. Therefore, Cannot improve reduction efficiency, oxygen content, powder particle size control and energy consumption

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