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Ammonium metavanadate drying process

A technology of ammonium metavanadate and drying process, which is applied in the directions of drying solid materials, heating to dry solid materials, and drying. Control and other issues, to achieve the effect of simple structure, easy large-scale production, and large-scale production

Inactive Publication Date: 2011-11-30
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 drum drying method is not suitable for drying such heat-sensitive materials due to the long residence time of the material, the drying temperature is difficult to control, and the moisture content of the product is also difficult to control.
The fluidized bed drying method has high requirements on the moisture content and fluidity of the material, and the wet ammonium metavanadate after solid-liquid separation has a high moisture content and poor fluidity, so it is easy to produce a "pressing bed" phenomenon, and also Not suitable for ammonium metavanadate drying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) send the ammonium metavanadate containing water 25.5wt% into the drying room of the rotary flash dryer with grading ring and swirl sheet with a diameter of 600mm with a feeder, feed rate 333kg / h; (2) hot air Conveying: Heat the air to 208°C±1°C with a hot blast stove, and pressurize it with a fan and send it into the spin flash dryer; (3) The wet material to be dried is combined with the high-speed swirling airflow and the bottom agitator, and The hot air is fully contacted in a short time, the temperature of the material rises to 40-60°C, the water evaporates, and the agglomerate material is continuously broken, dispersed, boiled and dried. When the hot air reaches the outlet, the temperature drops to 80°C, and the material is dried in a spin flash The residence time in the drying chamber of the machine is controlled at 5 seconds, and the finished product ammonium metavanadate containing 0.7wt% of free water is obtained; (4) discharge and tail gas treatment, dischar...

Embodiment 2

[0029] A spin flash dryer with a diameter of 300mm is used. The wet material ammonium metavanadate contains 17.8% water, the feed rate is 80kg / h, the hot air inlet temperature is 205°C±1°C, and the material stays in the spin flash dryer for 4 seconds. After evaporating water, the product volume is 66.3kg / h, the moisture content is 0.8%; the outlet air temperature is 78°C. The rest are the same as embodiment 1.

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Abstract

The invention discloses an ammonium metavanadate drying process, which comprises the following steps of: (1) feeding ammonium metavanadate containing 10 to 50 weight percent of water into a drying chamber of a spin flash dryer with grading rings and spinning disks; (2) heating air to 201 to 210 DEG C by using an air heater, and blowing the air into the spin flash dryer by using an air blower; (3)keeping wet materials to be dried stay in the drying chamber of the spin flash dryer for 2 to 5 seconds to obtain the ammonium metavanadate finished product containing more than or equal to 85 weight percent of free water; and (4) performing discharge and tail gas treatment and discharge, namely, feeding the dried materials into a discharge device by using air current, collecting the dried ammonium metavanadate after cyclone dust extraction and bag dust collection, and discharging tail gases in a way that the dust content of the tail gases reaches the standard. The process has the advantages of simplicity, reliability, convenient operation and maintenance, investment saving, dried material fineness and adjustable final water content, and short drying time.

Description

technical field [0001] The invention relates to an ammonium metavanadate drying process. Background technique [0002] Ammonium metavanadate (NH 4 VO 3 ) is 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 total reserves are V 2 o 5 Calculated at 25.96 million tons, ranking third in the world. Vanadium mines are widely distributed, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00F26B3/08F26B3/092
Inventor 申军戴斌联
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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