Process for calcining ammonium metavanadate for preparing powdered vanadium pentoxide

A technology of vanadium pentoxide and ammonium metavanadate, which is applied in the field of powdery vanadium pentoxide calcination by ammonium metavanadate, can solve the problems of incomplete deamination, insufficient oxidizing atmosphere, high energy consumption, etc., and achieve the calcination process The effect of stable, continuous and stable operation, and short process flow

Inactive Publication Date: 2012-05-09
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The small horizontal rotary furnace method is not easy to control the calcination temperature, and the residence time from heating to cooling is long. It is only suitable for intermittent production and small production plants, and is not suitable for large-scale continuous production; Ammonium vanadate is mixed with gas and solid, rapid mass transfer and heat transfer and rotating flow, which requires high energy consumption, short residence time, and insufficient oxidation atmosphere, which easily leads to incomplete deamination, while vanadium pentoxide powder requires a trap collect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) feed the ammonium metavanadate with a water content of 0.8wt% into the electric heating rotary kiln equipped with anti-caking facilities of diameter 800mm with feeder, feed rate 81kg / h; (2) heating and calcining, Cooling: Heat up the electric heating rotary furnace, ammonium metavanadate fully contacts with hot air in the furnace, the temperature of the material continues to rise, and begins to decompose at 210°C, continue to heat up to 550°C±2°C, keep it for 120 minutes, and then cool to 340°C, discharge; (3) Send the material cooled to 340°C into the cooling drum, stay for 30 minutes, and cool to 45°C to obtain the finished vanadium pentoxide 62.5kg / h; (4) Tail gas treatment and discharge : The decomposed ammonia and air go through the cyclone dust collector to collect a small amount of vanadium pentoxide contained in the exhaust gas, and then perform primary water washing and secondary pickling to reduce the ammonia content in the exhaust gas to the emission stand...

Embodiment 2

[0033] Adopt an electric heating rotary furnace with a diameter of 1250mm and equipped with anti-caking facilities. The feed ammonium metavanadate has a water content of 0.7wt%, the feed rate is 210kg / h, the calcination temperature is controlled at 525°C±2°C, and the calcination time is 150 minutes. The discharge temperature is controlled at 315°C, the material is cooled to 42°C in the cooling drum, and the product vanadium pentoxide is 162.2kg / h. The rest are the same as embodiment 1.

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Abstract

The invention relates to a process for calcining ammonium metavanadate for preparing powdered vanadium pentoxide. The process comprises the following steps of: (1) feeding ammonium metavanadate containing water of less than or equal to 1 percent by weight into an electric heating rotary furnace provided with an anti-agglomeration facility by using a feeder; (2) heating to rise the temperature to 510-560 DEG C, holding the temperature for 60-180 minutes, then cooling to 300-350 DEG C and discharging; (3) sending the material which has a temperature of 300-350 DEG C and is obtained in the step (2) into a cooling drum, and continuing to cool to 40-50 DEG C to obtain finished powder vanadium pentoxide; and (4) collecting a small quantity of vanadium pentoxide contained in tail gas of the rotary furnace by using a cyclone dust collector, carrying out primary water washing and secondary water washing on the tail gas to ensure that the ammonia content in the tail gas is reduced to reach an exhaust standard and then exhausting. The invention has the advantages of simple and reliable process, safe deamination, energy saving and environmental protection and is convenient to operate.

Description

technical field [0001] The invention relates to a process for calcining ammonium metavanadate, in particular to a process for preparing powdery vanadium pentoxide by calcining ammonium metavanadate. Background technique [0002] Ammonium metavanadate, the molecular formula is NH 4 VO 3 , white or slightly yellowish crystalline powder, relative density 2.326, molecular weight 116.98, slightly soluble in cold water, hot ethanol and ether, soluble in hot water and dilute ammonium hydroxide. When burning in air, it becomes vanadium pentoxide. poisonous. [0003] Ammonium metavanadate is an intermediate product of refining vanadium, mainly used to produce vanadium pentoxide (powder or flake), and then further produce metal vanadium, vanadium-iron alloy or other vanadium-based alloys. It can also be used as a chemical reagent, catalyst, drier, mordant, etc. It is widely used in the ceramic industry as a glaze. [0004] There are many vanadium resources in my country, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B34/22
Inventor 申军戴斌联
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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