System for realizing continuous leaching of vanadium slag

Abstract

The invention discloses a system for realizing continuous leaching of vanadium slag. The system comprises a rapid reaction mechanism, a slow reaction mechanism and an acid adding mechanism, wherein the rapid reaction mechanism comprises a vertical acid preparation tank, a dilute sulfuric acid pump communicating with the vertical acid preparation tank, a primary jet device connected with the dilute sulfuric acid pump and a secondary jet device communicating with an outlet of the primary jet device, the slow reaction mechanism is provided with a horizontal stirring device connected with the secondary jet device and a belt type suction filtration device communicating with the liquid discharge end of the horizontal stirring device, the acid adding mechanism comprises a high-level tank, the liquid inlet end of the high-level tank is connected with the vertical acid preparation tank, and the liquid outlet end of the high-level tank communicates with the horizontal stirring device. According to the system, the conditions that a stirring blind area exists in a rapid reaction section of the vertical stirring tank and the stirring strength is low are avoided through the primary jet device and the secondary jet device, continuous slow reaction is achieved through the horizontal stirring device, flow stability is guaranteed through the acid adding device, and the leaching process efficiency and the leaching process effect in the vanadium oxide clean production process are improved.

Description

Technical field [0001] The present invention relates to the field of vanadium chemical techniques, and in particular, to a continuous leaching system for vanadium residue. Background technique [0002] The leaching process in the vanadium oxide cleaning production process refers to the process of stirring the vanadium residue calcination with sulfuric acid in the leaching tank and reacted to obtain a leach. The leaching process is divided into two reaction stages, and the rapid reaction phase needs to be even added 80% of concentrated sulfuric acid in 1 / 4, and it is necessary to stir vigorously, and the slow reaction section needs to be evenly added to the 3 / 4 time. Sulfuric acid, leaching effect depends on the time required of dilute sulfuric acid into the vanadium residue core, and has nothing to do with the agitation strength. [0003] The existing leaching device is a vertical stirring tank, which can only be produced can, and cannot form a continuous stream. The production p...

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Problems solved by technology

[0003] The existing leaching device is a vertical stirring tank, which can only be produced tank by tank, cannot form a continuous material flow, and the production process is unstable

Since the vanadium slag is a hard particle, it will cause strong erosion to the blades of the stirring paddle, and there are many faults in the leaching tank; especially in the latter step of the belt filtration process, once the flow is cut off, the filter cake cannot be formed, and it is very difficult to restore the filtration function, which is often interrupted Production

Using the existing leaching device, in the actual leaching process, a 30-cubic large-scale vertical agitator is used for leaching, with a power of more than 100 kilowatts. Stirring blind zone, a large amount of solid vanadium slag is separated from the liquid to form a pile, the reaction is not complete, the outlet is easily blocked by low-speed vanadium slag, the leaching rate is not high, due to the large tank capacity, slow mass transfer, and serious lag in the control of acid addition, etc. When the pH value reaches the limit value, the amount of acid added has exceeded the standard, and the reaction process is difficult to control, which affects the leaching rate; the acid adding device adopts the high-level tank method, and the high-level tank is filled with dilute sulfuric acid in advance, and the opening is controlled by the first-stage normally open valve. , to adjust the flow rate, and the second-stage electric valve controls the switching time to control the amount added. As the liquid level in the tank keeps dropping, the flow rate continues to decrease, resulting in uneven acid intake. The slow reaction stage in the later stage only needs a long time A small amount of acid is added at a uniform speed, but since there is only one acid feeding pipeline, the flow rate cannot be reduced, which affects the leaching effect

[0004] Although the slow reaction section can slow down the frequency control of the agitator, there is a dead zone under the agitator shaft, which inevitably deposits a large amount of vanadium slag, which affects the leaching effect of the slow section.

In addition, high-power frequency conversion motors and frequency converters make the one-time investment surge

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