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Ventilated forced drainage type nano tungsten powder reducing furnace for industrial use

A nano-tungsten powder, an industrial technology, applied in furnaces, furnace components, furnace types, etc., can solve the problems of unfavorable dust removal of tungsten powder yield, affect the production level of nano-tungsten powder, and the water vapor cannot be discharged quickly, etc., to achieve Solve the effects of uneven reduction, less material loss and high yield

Inactive Publication Date: 2007-12-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the process of preparing nano-tungsten powder, since the raw material oxide powder is nano-scale powder, the violent movement of the material is very unfavorable to the actual yield of tungsten powder and the dust removal of the equipment. Therefore, if you choose a mechanical rotary kiln or Ebullated bed is not suitable
However, although the existing tubular pusher-type reduction furnace does not have the problem of material loss, the biggest disadvantage is that the water vapor in the reaction material layer cannot be quickly discharged. Therefore, it has been found that the use of the tubular pusher-type reduction furnace When producing nano-tungsten powder, the average particle size of tungsten powder has been high, it is difficult to reach ≤100nm, and the particle size distribution bandwidth is >120nm, and there are still 35% (mass fraction) of particles larger than 100nm in the powder
This phenomenon has seriously affected the production level of nano-tungsten powder in my country.

Method used

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  • Ventilated forced drainage type nano tungsten powder reducing furnace for industrial use

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The gas-permeable and strong-drainage nano-tungsten powder reduction furnace with a production capacity of 1.42 tons / month should be designed as follows.

[0034] 1. Furnace tube preparation

[0035] Use Cr25Ni20 heat-resistant stainless steel plate or 1Cr18Ni9Ti stainless steel plate with thickness δ=4.5mm, combined welding to make two rectangular furnace tubes with rectangular cross-section, the furnace inner cavity height H=36mm, inner cavity width B=146mm, the furnace tube is heat-resistant The total length of the steel part is 2274mm, the length of the furnace tube in the water-cooling jacket is 665mm, the length of the furnace body is 1824mm, the length of the high-temperature zone of the furnace tube is 1424mm, and the heating in one zone is 32KW, and the length of the cooling water jacket is 480mm.

[0036] 2. Positive pressure for H 2 The porous air cushion is combined and welded with stainless steel plates with a thickness of δ=1mm, and there are 5 gas channe...

Embodiment 1

[0039] Example 1 Effect

[0040] The nano-amorphous tungsten oxide precursor powder produced by the ultrasonic spray heat conversion process in the air-permeable and strong-drainage nano-tungsten powder reduction furnace designed above, at 600 ° C; 60 minutes; H 2 Air pressure ΔP=0.005MPa; H 2 Sectional flow rate is 90ml / cm 2 Points; H 2 The air dew point is -15℃; the speed of pushing the boat is 7.12 boats / h; the loading capacity of the boat is 0.65g / cm 2 ;Under the condition of a total of 185g per boat, the produced nano-tungsten powder SAXS average particle size=30.3nm, BET specific surface area is 23m 2 / g, the daily output of tungsten powder (double tube) is 47.4kg / day, at the same time, in order to compare the reduction effect, the positive pressure in the above two furnace tubes is supplied to H 2 The porous air cushion is removed and changed to a conventional reduction furnace, and the gas supply method is to supply H along the axis of the furnace tube 2 gas. The...

Embodiment 2

[0042] Prepare a kind of garden-shaped furnace tube (single tube), and daily output is that the air-permeable strong drainage type nanometer tungsten powder reduction furnace of 8.3kg / day should be designed according to the following.

[0043] 1. Furnace tube preparation

[0044] The Cr25Ni20 heat-resistant stainless steel pipe with a thickness of δ=6mm and an inner diameter of φ70mm is 2.3 meters long, of which the water cooling jacket occupies a length of 450mm, the length of the furnace body is 1500mm, the length of the high temperature zone is 1.1 meters, and the heating power is 10KW. In the high temperature zone, two boats can be cooled simultaneously in the water cooling jacket.

[0045] 2. Positive pressure for H 2 The porous air cushion is made of a garden-shaped stainless steel tube with a diameter of φ=12mm and a wall thickness of δ=1.5mm. The holes at both ends are blocked, and the length L=2.28 meters. The two ends are fixed on the bottom of the garden-shaped fur...

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Abstract

The invention discloses a poromeric draining pipe type reducing furnace, which comprises the following parts: boating-pushing device (1), firedoor (2), exhaust ignition or recovery pipe (3), poromeric boat-container (4), nanometer tungsten oxide powder (5), boat-container poromeric floor (6), furnace tube (7), positive pressure H 2 supply porous air-cushion (8), heating plate (9), drainage air-flow channel (10), furnace case (11), cold water case (12), positive pressure air-supply system (13) and furnace rack (14), wherein the positive pressure H 2 supply porous air-cushion (8) is set on the bottom of furnace tube (7); the H 2 even pressure chamber is formed between the double-layer boat-container poromeric plate (6) and porous air-cushion (8), which pierces the boat-container poromeric floor (6) after buffering. The average grain size of nanometer tungsten powder is or less than 35.5 nm with the distribution breadth ranged from 45 to 50 nm.

Description

technical field [0001] The invention belongs to the technical field of reduction equipment, and in particular provides an industrial gas-permeable and strong-drainage nano-tungsten powder reduction furnace, which is suitable for various working fields of preparing nano-metal powders by hydrogen reduction; such as nano-metal tungsten in powder engineering Powder, nano-cobalt powder, nano-nickel powder, nano-nickel-iron alloy powder reduction. Background technique [0002] From the literature search in the past 50 years, it can be seen that with H 2 Restore WO 3 The process of directly producing tungsten powder or reducing it to blue tungsten (or tungsten dioxide) and then reducing it to tungsten powder has a history of more than 100 years. Most of the reduction furnaces used are tubular pusher type reduction furnaces. After 1996, the United States, the Soviet Union, China and Germany began to develop mechanical rotary furnaces and fluidized bed (fluidized bed) reduction furn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22F27D7/02F27B13/12
Inventor 吴成义张丽英林涛李会谦汪莉
Owner UNIV OF SCI & TECH BEIJING
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