Vanadium pentoxide preparation method

A technology of vanadium pentoxide and vanadium liquid, which is applied in vanadium oxide and other directions, can solve the problems of unseen heat exchanger scaling, low vanadium pentoxide production efficiency, and high pipeline cleaning cost, so as to reduce the amount of condensed water and save energy. resources, the effect of improving the utilization rate

Active Publication Date: 2016-02-10
攀钢集团西昌钒制品科技有限公司
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AI Technical Summary

Problems solved by technology

[0006] For example, in the production process of the precipitation process of Xichang Vanadium Plant, the cleaning frequency of the heat exchanger during operation is once every 7 to 10 days. Using the same cleaning method, there are problems such as high cost of pipeline cleaning and low production efficiency of vanadium pentoxide, and so far, there is no effective solution to the problem of fouling of heat exchangers in the process of vanadium precipitation in acidic vanadium liquid. method

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preparation example Construction

[0025] A kind of preparation method of vanadium pentoxide of the present invention, comprises the following steps:

[0026] a. Replace the inner pipe of the tubular heat exchanger in the preheating process of the vanadium precipitation process with a static mixer pipe, and use steam heat exchange to raise the temperature of the acidic vanadium liquid from normal temperature to 65-75°C;

[0027] b. Add the acidic vanadium solution after heat exchange in step a into the ammonium addition tank. According to the molar ratio, NH 4 + : TV=0.6~0.9:1, add ammonium sulfate, stir to obtain the mixed solution;

[0028] c. Add the mixed solution obtained in step b into a precipitation tank, stir, adjust the pH value to 1.5 to 2, and heat to 90° C. to boiling with steam to obtain ammonium polyvanadate solution;

[0029] d. Settling the ammonium polyvanadate solution obtained in step c, taking ammonium polyvanadate for precipitation, washing, drying, and calcining to obtain vanadium pento...

Embodiment 1

[0038] A kind of preparation method of vanadium pentoxide of the present invention, comprises the following steps:

[0039] a. The preheating process of the vanadium precipitation process uses a SK-type static mixer to use steam heat exchange at about 180°C to raise the temperature of the acidic vanadium liquid from normal temperature to 65°C; the initial flow rate of the acidic vanadium liquid through the heat exchanger pipe is >50m 3 / h, the frequency of the pump remains unchanged at 50Hz, and the composition of the acidic vanadium liquid passing through the heat exchanger for a period of time is calculated as TV: 20g / L, pH value is 3, the heat exchanger is used intermittently, and the operation time is 3h each time. The interval time is 3h;

[0040] b. Add the acidic vanadium solution after heat exchange in step a into the ammonium addition tank. According to the molar ratio, NH 4 + : TV=0.6:1, add ammonium sulfate, stir, obtain mixed liquor;

[0041] c. Add the mixed so...

Embodiment 2

[0046] A kind of preparation method of vanadium pentoxide of the present invention, comprises the following steps:

[0047] a. The SL static mixer is used in the preheating process of the vanadium precipitation process, and the temperature of the acidic vanadium liquid is raised from normal temperature to 75°C by using steam heat exchange at about 180°C; the initial flow rate of the acidic vanadium liquid through the heat exchanger pipe is >50m 3 / h, the frequency of the pump remains unchanged at 50Hz, and the composition of the acidic vanadium liquid passing through the heat exchanger for a period of time is calculated as TV: 25g / L, pH value is 3.5, the heat exchanger is used intermittently, and the operation time is 3h each time. The interval time is 3h;

[0048] b. Add the acidic vanadium solution after heat exchange in step a into the ammonium addition tank. According to the molar ratio, NH 4 + : TV=0.9:1, add ammonium sulfate, stir, obtain mixed liquor;

[0049] c. Add t...

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Abstract

The invention belongs to the field of hydrometallurgy and particularly relates to a vanadium pentoxide preparation method. The preparation method comprises the following steps that (a) the temperature of acidic vanadium liquid rises from normal temperature to 65-75 DEG C in the preheating process of a vanadium precipitation process by using a static mixer pipe and utilizing steam heat exchange; (b) the acidic vanadium liquid subjected to heat exchange is added into an ammonium tank, ammonium sulfate is added, and stirring is performed to obtain mixed liquid; (c) the mixed liquid is added into a sedimentation tank, stirring is performed, a pH value is regulated to be 1.5-2, and steam heating is performed to reach 90 DEG C to boiling so as to obtain an ammonium poly-vanadate solution; (d) precipitate obtained after the ammonium poly-vanadate solution precipitates is washed, dried and calcinated to obtain vanadium pentoxide. The flowing state of the acidic vanadium liquid in the pipe is changed by utilizing a mixing unit body fixed in the static mixer pipe, the formation of a laminar flow bottom layer is inhibited to enable the acidic vanadium liquid to rapidly disperse in the pipe, the temperature distribution of all parts of the solution tends to be uniform, the formation of a scale layer is retarded, and the production efficiency of the vanadium pentoxide is improved.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a preparation method of vanadium pentoxide. Background technique [0002] With the clean production process of vanadium oxide, the technical problem of low bulk density in the ammonium polyvanadate precipitation process has been overcome, and the quality of vanadium oxide products has been greatly improved. However, in the existing preparation process of vanadium pentoxide, the heat exchanger is frequently fouled and blocked during the preheating process of the vanadium precipitation process, which makes the utilization rate of the heat exchanger low and seriously affects the production efficiency of vanadium pentoxide. The process often skips the preheating process, and directly passes steam into the precipitation tank to heat the qualified liquid, which greatly increases the amount of condensed water entering the vanadium precipitation system, breaking the balance of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 叶露彭毅王绍东陈燕何文艺张林申彪陈相全
Owner 攀钢集团西昌钒制品科技有限公司
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