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Preparation method of superfine active zinc powder

A technology of active zinc and zinc powder, applied in the chemical industry, can solve the problems of narrow application range, different particle sizes, high oxidation degree of zinc powder, and achieve the effects of no safety hazard, short condensation time and high production efficiency.

Pending Publication Date: 2021-05-28
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the zinc powder produced by the atomization method has a large particle size and uneven distribution; the ultrafine zinc powder produced by the evaporation condensation method has low activity; Severe knots, different particle sizes
[0004] Chinese invention patent CN1994630A (production equipment and preparation method of high-purity ultra-fine active zinc powder) utilizes the principle that zinc powders of different particle sizes are subjected to different forces in the airflow vortex, and obtains different particle sizes of 2~120um by controlling the parameters of the classifier Standard products, but the process is complex and the particle size distribution of zinc powder is uneven
Application for patent 201510902643.X (a method of producing spherical zinc powder using hot-dried zinc slag) uses hot-dried zinc slag as raw material, uses evaporation and condensation, inert gas to change the vapor pressure of the material surface, fully enclosed anti-oxidation, and extremely cold cooling Produce ultra-fine zinc powder with a particle size of 1~4um. This method is aimed at thermal transition zinc slag and uses inert gas to condense on the surface of liquid zinc. The application range is narrow

Method used

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  • Preparation method of superfine active zinc powder
  • Preparation method of superfine active zinc powder
  • Preparation method of superfine active zinc powder

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preparation example Construction

[0030] The preparation method of the superfine active zinc powder of the present invention comprises the steps of blowing and mixing, condensation collection, specifically comprising:

[0031] A. Blowing and mixing: The raw material zinc is melted to form zinc vapor, and the inert gas in different directions of the zinc vapor flow is blown into a mixed gas containing zinc vapor, and the gas-zinc ratio is controlled to be 8~60Nm 3 / Kg;

[0032] B. Condensation collection: Condensate the mixed gas a containing zinc vapor to a temperature of 80~120°C, settle and bag dust to obtain the target superfine active zinc powder, namely, sedimentation zinc powder and bag zinc powder.

[0033] The inert gas passing through different directions of the zinc vapor flow described in step A is to first pass a small amount of inert gas through the vertical direction of the zinc vapor flow. When the temperature of the inert gas-mixed zinc vapor is 750~850°C, open parallel to the zinc vapor. Iner...

Embodiment 1

[0044] Place the weighed zinc ingot at the bottom of a sealed heat-resistant reaction device for heating. During the heating process, a small amount of nitrogen gas is first introduced into the horizontal direction of the zinc vapor outlet, and the nitrogen flow rate is 0.02m 3 / h, after the temperature rises to 800°C, turn on the nitrogen gas in the vertical direction, the ratio of nitrogen gas in the horizontal direction to the vertical direction is 4:3, and the gas-zinc ratio is 50 Nm 3 / kg, the nitrogen flow rate in the horizontal direction is 0.8m 3 / h, the nitrogen flow rate in the vertical direction is 0.6m 3 / h, the whole process maintains a negative pressure of 5mmH 2 O.

[0045]The nitrogen gas mixed in proportion directly condenses zinc vapor in the gas phase condenser to form solid ultrafine zinc powder, and the solid ultrafine zinc powder and hot gas nitrogen ( figure 2 Be the scanning electron microscope figure of present embodiment zinc powder, as seen from th...

Embodiment 2

[0049] Place the weighed zinc ingot at the bottom of a sealed heat-resistant reaction device for electric heating. During the heating process, a small amount of inert gas is first introduced into the horizontal direction of the zinc vapor outlet, and the flow rate of the inert gas is 0.08m 3 / h, after heating up to 800°C, turn on the inert gas in the vertical direction, the ratio of inert gas in the horizontal direction to the vertical direction is 1:6, and the gas-zinc ratio is 56 Nm 3 / kg, the nitrogen flow rate in the horizontal direction is 0.2m 3 / h, the nitrogen flow rate in the vertical direction is 1.2m 3 / h, the whole process maintains a negative pressure of 8mmH 2 O.

[0050] The inert gas mixed in proportion directly condenses zinc vapor in the gas phase condenser to form solid ultrafine zinc powder, and the solid ultrafine zinc powder and hot gas inert gas (<400°C) enter the container with a water condensation tube together After further cooling to about 100°C, ...

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Abstract

The invention discloses a preparation method of superfine active zinc powder. The preparation method of the superfine active zinc powder comprises the steps of blowing away, mixing, condensing and collecting, and specifically comprises the following steps: melting a raw material zinc to form zinc steam, blowing away to form mixed gas a containing the zinc steam through inert gas in a different direction from zinc steam flow, and controlling the gas-zinc ratio to be 8-60 Nm<3> / Kg; and condensing the mixed gas a containing zinc steam to 80-120 DEG C, and settling and collecting dust by a cloth bag to obtain the target superfine active zinc powder, i.e., settling zinc powder and cloth bag zinc powder. The prepared superfine active zinc powder is spherical, narrow in particle size distribution range, less in surface oxidation, less in adhesion and free of classification, the particle size range is generally 1-20 [mu]m, and the particle size can be controlled by adjusting the flow of nitrogen or inert gas. The process has the advantages of short flow, cleanness, high efficiency, good safety, low investment and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of ultrafine active zinc powder. Background technique [0002] Ultrafine active zinc powder has spherical, flake, needle and dendritic shapes, etc. It is widely used in chemical industry, hydrometallurgy (for solution purification and metal replacement recovery, etc.), medicine, pesticides, batteries, catalysts, lubricating materials, coatings In terms of anti-corrosion, high-performance metal ultra-fine automotive topcoats, inorganic antibacterial materials, and nano-composite additives, the zinc powder demanded by some industries has long been monopolized by developed countries. At present, my country's annual demand for ultra-fine zinc powder is more than 100,000 tons, and it is increasing year by year. However, traditional zinc powder production enterprises are gradually facing closure due to environmental protection and safety issue...

Claims

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Application Information

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IPC IPC(8): B22F9/12
CPCB22F9/12Y02E60/10
Inventor 李小英田林谢刚翟忠标林琳杨妮彭学斌杨勇庄晓东
Owner KUNMING METALLURGY INST
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