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Method for recycling tungsten oxide powder dust from flue gas of calcining ammonium paratungstate and recovering device

A technology of tungsten oxide and ammonium paratungstate, which is applied in chemical instruments and methods, separation methods, climate change adaptation, etc., can solve problems such as easy pollution, low recovery rate, and high difficulty, and achieve reduction of production costs and environmental pollution, recycling High rate and utilization rate, the effect of improving utilization rate

Inactive Publication Date: 2009-01-21
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, there are a lot of accumulated materials in the flue, and it is easy to block; the washing liquid is slurry, easy to be polluted, the recovery rate is low and difficult, and the production cost is high; Handling and other ills
In addition, the traditional pulse bag dust collector is only suitable for collecting dry dust with low water content, but not for dust with high water content and dew point temperature, which is easy to scab (block) at room temperature

Method used

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  • Method for recycling tungsten oxide powder dust from flue gas of calcining ammonium paratungstate and recovering device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Taking the dust collection device used in conjunction with the ammonium paratungstate calciner as an example, the total height of the device is 3740 mm, in which: the axial height of dust collection chambers 2 to 1 is 1620 mm, the axial section of the inner cavity is a rectangle with a side length of 1268 mm, and the ash hoppers 2 to 1 The height of 2 is 1520mm, the included angle is 60°, and the height of exhaust chamber 5 is 325mm; there are 48 dust collection chambers 2~1 made of Fluomes material, with a total filtration area of ​​36m 2 There are 6 dust collection bags (groups) and 2 electric heating plates 8 symmetrically, each with a surface area of ​​0.335m 2 , 40A, 6KW, maximum surface temperature 350°C, thermocouple 8-1 is a thermocouple used in conjunction with electric heating plate 8; the present embodiment sets a model at the outlet end of tail gas outlet 5-1 as 4-72№-4A- The 5.5KW induced draft fan ensures the stable operation of the dust collect...

Embodiment 2

[0015] Example 2: Taking the recovery of tungsten oxide dust from the flue gas produced by calcining ammonium paratungstate to produce yellow tungsten as an example, 100 tons of APT are successively added to the rotary tube electric furnace for calcining to produce yellow tungsten, and the flue gas passes through the inverted "V"-shaped flue gas pipe 7 Entering from the upper part of the ash hopper 2~2, there are 48 filters made of Fluomes material, with a total filtration area of ​​36m 2 , In the dust collection chamber 2~1 of the dust collection bag (group) 6 of model FMS9804, at a temperature of 100±5°C, the working negative pressure is -4500pa and the air volume is 3000m 3 Under the condition of / h, the tungsten-containing oxide dust in the flue gas is collected in the ash hopper of the dust collector; in this embodiment, the dust bag is automatically cleaned once by reverse pressure (pulse) every 10 minutes, and the cleaning The ash flow pressure is 0.35Mpa, and the clean...

Embodiment 3

[0016] Example 3: Taking the recovery of tungsten oxide dust from the flue gas produced by calcining ammonium paratungstate to produce blue tungsten as an example, 100 tons of APT are successively added to the rotary tube electric furnace for calcining to produce blue tungsten, and the flue gas passes through the inverted "V"-shaped flue gas pipe 7 Entering from the upper part of the ash hopper 2~2, there are 102 filters made of Fluomes material, with a total filtration area of ​​61m 2 In the dust collection chamber 2~1 of the dust collection bag (group) 6, the temperature is 100±5°C, the working negative pressure is -3500pa and the air volume is 3200m 3 Under the condition of / h, the tungsten-containing oxide dust in the flue gas is collected in the ash hopper of the dust collector; the remaining parameters are the same as in Example 2. In this embodiment, 200kg of dust-collecting materials are obtained in total; the tail gas after dust removal is washed with water to obtain ...

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Abstract

The invention belongs to a method for recycling tungsten oxide dust from calcining ammonium paratungstate flue gas and a recovery device. The method is as follows: the flue gas which is discharged from a calcinatory is directly sent into an impulse-type bag dust collection device through a flue gas pipe, and the tungsten oxide dust in the flue gas is recovered at the temperature of 90-110 DEG C and the work negative pressure of minus 3,500-minus 8,000 Pa. The dust collection device consists of a frame, a shell and the flue gas pipe which are provided with an insulating layer, a dust chamber and a dust hopper with an electrical heating plate which are arranged in the shell, a dust bag set and a thermoelectric couple which are arranged in the dust chamber, a discharge hole which is provided with a control valve, a tail gas cavity and a tail gas outlet which are connected with a main induced draft fan, a pulse tube with a nozzle group and a gas collecting cylinder which is hermetically connected with the outer end of the pulse tube and is provided with a pulse valve. The method of the invention is characterized in that the tungsten oxide dust has high recovery rate, utilization rate and purity, and can be directly used for producing yellow tungsten oxide (WO3), the utilization rate of tungsten resources can be effectively improved, production cost and environmental pollution can be reduced, etc.

Description

technical field [0001] The invention belongs to a method and a recovery device for recovering tungsten oxide from flue gas produced by calcining ammonium paratungstate (APT) to produce blue tungsten oxide and yellow tungsten oxide during the tungsten smelting process. In particular, a method and device thereof for recovering tungsten oxide dust in the flue gas produced by the ammonium paratungstate calcination process using a pulse bag dust collector (device); the recovery rate of tungsten oxide dust is greater than 99%, and the dust collecting material can be directly As a raw material for the production of yellow tungsten oxide (WO 3 )Wait. Background technique [0002] In the process of calcining ammonium paratungstate to produce tungsten oxide by using a rotary tube electric furnace, depending on the product, reducing gas or oxidizing gas needs to be introduced to produce blue tungsten oxide and yellow tungsten oxide respectively. During the calcination process, about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/02C22B1/02C22B34/36C01G41/02
CPCY02A50/2351
Inventor 廖利波何玉超罗正祥
Owner ZIGONG CEMENTED CARBIDE CORP
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