Method for producing vanadium trioxide

Abstract

A process for preparing V2O3 includes such steps as adding the powdered ammonium vanadate or V2O5 into the furnace pipe of an externally heated fluidized furnace, filling industrial gas in the furnace pipe while heating it to 600-650 deg.C, reducing reaction for 3-9 min, and cooling in the condition of isolating air.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for producing vanadium trioxide (V 2 o 3 )Methods. Background technique [0002] At present, there are two methods for producing vanadium trioxide in the world: one is the thermal decomposition and cracking method of ammonium vanadate (ammonium metavanadate and ammonium polyvanadate) without adding a reducing agent; the other is the method of adding a reducing agent Direct reduction method, the reducing agent used includes ammonia, hydrogen, carbon monoxide, methane or metal vanadium, calcium, magnesium, carbon, etc. The raw materials used to prepare vanadium trioxide usually include vanadium pentoxide, ammonium metavanadate or ammonium polyvanadate. The pyrolysis cracking method has a high decomposition temperature, and it is difficult to manufacture equipment, so it is difficult to put it into actual production; the direct reduction method of reducing agent is more ...

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Problems solved by technology

The disadvantages of this method are: 1. In the actual large-scale industrial production application, the closed rotary kiln is basically used as the implementation equipment. This method requires that the rotary kiln must be used under dynamic sealing. The dynamic sealing of the rotary kiln is when the kiln body is small. It is relatively easy to solve, but it is difficult to do it when the rotary kiln is large. In fact, the rotary kiln for industrial production of vanadium trioxide at home and abroad has not fundamentally solved the sealing problem, and the production is carried out in a fully ventilated workshop to ensure Safety; 2. The material of the rotary kiln must be able to withstand high temperature (generally require long-term normal operation above 900°C), otherwise it will easily cause deformation or even damage to the equipment, and the life of the equipment will be greatly affected. At the same time, due to the selection of materials and the manufacturing process As well as installation restrictions, the maintenance and repair workload of the rotary kiln is relatively large, which greatly affects the normal production and safety requirements; 3. The filling rate of the rotary kiln production is very low (about 5%), and the production efficiency is low. , the waste of reducing gases such as coal gas is very large; 4. The reduction time is relatively long, and the product grade achieved is not very high

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