A system for realizing continuous leaching of vanadium slag

Abstract

The invention discloses a system for realizing the continuous leaching of vanadium slag, which includes a fast response mechanism, a slow response mechanism and an acid adding mechanism. The fast response mechanism includes a vertical acid distribution tank, a dilute sulfuric acid pump connected with the vertical acid distribution tank, The first-stage ejector connected to the pump and the second-stage ejector connected to the outlet of the first-stage ejector. The slow response mechanism is provided with a horizontal stirring device connected to the second-stage ejector and a pump connected to the discharge end of the horizontal stirring device. Belt-type suction filtration device, the acid adding mechanism includes a high-level tank, the liquid inlet end of the high-level tank is connected with the vertical acid distribution tank, and the liquid outlet end of the high-level tank is connected with the horizontal stirring device. The present invention avoids the situation of blind stirring area and low stirring intensity in the rapid reaction section of the vertical stirring tank through the first-stage jetter and the second-stage jetter. The horizontal stirring device realizes continuous slow reaction, and the acid adding device ensures the flow stability and improves oxidation efficiency. Leaching process efficiency and leaching process effect in vanadium cleaner production process.

Description

A system for realizing continuous leaching of vanadium slag technical field The present invention relates to the technical field of vanadium chemical industry, particularly a kind of continuous leaching system for realizing vanadium slag. Background technique The leaching process in the vanadium oxide clean production technology refers to that the vanadium slag roasting clinker and sulfuric acid are stirred and mixed in the leaching tank. The process of obtaining the leachate from the reaction. The leaching process is divided into two reaction stages, and the rapid reaction stage needs to be uniformly added in 1 / 4 of the time. 80% concentrated sulfuric acid is added, and strong stirring is required. The slow reaction section needs to evenly add 20% dilute sulfur in 3 / 4 of the time. Acid, the leaching effect depends on the time it takes for the dilute sulfuric acid to penetrate into the core of the vanadium slag, and has nothing to do with the stirring intensity. Exi...

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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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