CN103949650A - Preparation method of columnar zinc powder - Google Patents
Preparation method of columnar zinc powder Download PDFInfo
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- CN103949650A CN103949650A CN201410168297.2A CN201410168297A CN103949650A CN 103949650 A CN103949650 A CN 103949650A CN 201410168297 A CN201410168297 A CN 201410168297A CN 103949650 A CN103949650 A CN 103949650A
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Abstract
The invention belongs to a production method of zinc powder, in particular to a production process method of columnar zinc powder used in the battery industry. The process comprises the following steps: (1) heating and melting metal zinc or zinc alloy in a melting furnace, keeping superheat degree above melting point, and making molten liquid flow into a rotary cup of an atomizing chamber through a heat-preservation guide pipe; (2) and starting a motor of the rotating cup, wherein the rotating cup is provided with uniform through micropores, and the molten liquid is thrown to the atomizing chamber filled with protective gas through the through micropores to form columnar zinc or zinc alloy powder. The product of the invention has unique and adjustable appearance, high purity, better stability and uniformity, simple process and shorter flow, and can be produced in large scale.
Description
Technical Field
The invention belongs to a production method of zinc powder, in particular to a production process method of columnar zinc powder used in the battery industry.
Background
The columnar zinc powder is mainly applied to alkaline zinc-manganese batteries in industry, and the dosage of the zinc powder in the alkaline zinc-manganese batteries accounts for more than 80 percent.
Alkaline zinc-manganese batteries are one of the most promising products for the battery industry, and mercury-free zinc powder used in the products is the main raw material in the batteries. The mercury-free zinc powder of the battery manufacturers in China is mainly imported from companies such as Belgian Youmei, germany Gliluo, japan Tri-well and Canada Loanda, wherein Belgian and Germany are the main companies. With the expansion of the production scale of alkaline manganese batteries in China, domestic enterprises see the market at a glance, and develop the product of the battery zinc powder by putting into force in sequence, and after years of efforts, the quality level of the domestic zinc powder reaches the level of imported products. Although battery zinc powder in China has obvious progress in recent years, compared with the same foreign lines, the battery zinc powder has larger differences, such as scale, product type, stability and uniformity, product research and development investment and the like; the columnar zinc powder is high-performance discharge zinc powder and has higher discharge ratio than the traditional dendritic or spherical zinc powder.
From the development space of the alkali-manganese battery in China, the alkali-manganese battery and the battery zinc powder in China have larger development space and better market prospect in a global range.
Disclosure of Invention
The invention provides a preparation method of columnar zinc powder, and the product prepared by the method has the advantages of unique and adjustable appearance, high purity, good stability and uniformity, simple process, short flow and mass production.
The technical scheme adopted for realizing the above purpose of the invention is as follows: (1) heating and melting metal zinc or zinc alloy in a melting furnace, keeping superheat degree above melting point, and making molten liquid flow into a rotary cup of an atomizing chamber through a heat-preservation flow guide pipe; (2) and starting a motor of the rotating cup, wherein the rotating cup is provided with uniform through micropores, and the molten liquid is thrown to the atomizing chamber filled with protective gas through the through micropores to form columnar zinc or zinc alloy powder.
The specific technical scheme of the invention also comprises:
(1) the metal zinc or zinc alloy keeps the superheat temperature range of 10-200 ℃ above the melting point;
(2) vacuumizing the atomizing chamber, and then filling protective gas with the pressure of 90-115 KPa to ensure that the oxygen content of the protective gas atmosphere is 50-3000 ppm;
(3) the rotating speed range of the atomizing motor is 3000-60000 r/min.
(4) Zinc or zinc alloy liquid flows into the rotary cup of the atomizing chamber through a heat-preservation flow guide pipe, and the heat-preservation temperature range is 50-300 ℃ above the melting point of zinc or zinc alloy;
the aperture of the through micro-hole of the rotating cup is 10-1000 μm.
The rotary cup is made of metal or ceramic materials, the bottom end of the cup is provided with threads, and the rotary cup is arranged on a high-speed motor; the heat preservation flow guide pipe is electrically heated, the temperature is measured by a thermocouple, and the temperature is controlled by a PLC; the protective gas filled in the atomizing chamber is nitrogen or inert gas; the diameter of the columnar powder obtained by atomization is adjusted to 10-600 μm and the length is adjusted to 50-1000 μm.
Compared with the prior art, the invention has the following advantages:
(1) The diameter of a cylindrical column of the zinc powder is controlled by rotating micropores of the cup, and the diameter of the cylindrical column of the zinc powder can be adjusted at will according to the aperture;
(2) The length of a cylindrical body of the columnar zinc powder is controlled through the atomization rotating speed, and the length of the cylindrical body of the powder can be adjusted at will along with the rotating speed;
(3) The preparation process is finished in a closed atomizing chamber, and the oxidation rate of the zinc powder is adjusted through atomizing atmosphere;
(4) The preparation process is completed in a closed atomizing chamber, so that the contact of an external medium is reduced, and the purity of the zinc powder is improved.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a 50-fold topographical map of a zinc powder column of the present invention;
FIG. 3 is a 100-fold topographical map of a columnar zinc powder of the present invention.
Detailed Description
In order to better explain the technical solutions of the present invention, the present invention is further explained below with reference to specific embodiments, and the scope of protection is not limited to the examples.
Example 1:putting a zinc ingot with the purity of 99.5 percent into a melting pot, covering a cover for sealing, vacuumizing and introducing nitrogen to replace oxygen in the melting pot until the oxygen content of the atmosphere is lower than 1000ppm. Starting a heating power supply to heat, wherein a temperature thermocouple is arranged in the pot; when the temperature is heated to 520 ℃, the zinc starts to melt, the temperature is continuously heated to 580 ℃ and the automatic heat preservation is carried out, wherein the temperature fluctuation range is +/-10 ℃; heating the heat-preservation heat-conducting pipe, and setting the heat-preservation temperature to be 600 ℃; vacuumizing an atomizing chamber, filling the atomizing chamber with argon to 95KPa, enabling the oxygen content of atmosphere in the atomizing chamber to reach 200-300 ppm, starting a high-speed motor at the rotating speed of 4000 revolutions per minute, and enabling a rotating cup to reach the atomizing rotating speed; opening a liquid discharging switch of the melting pot, and putting the zinc liquid into a rotary cup of an atomizing chamber for atomization; and (4) enabling the atomized columnar zinc powder to fall into a powder collecting tank at the bottom of the atomization chamber, and taking down the tank to obtain the columnar zinc powder.
Example 2:and (3) filling the zinc alloy ingot with the purity of 99% into a melting pot, covering the melting pot with a cover for sealing, vacuumizing and introducing nitrogen to replace oxygen in the melting pot until the oxygen content of the atmosphere is lower than 1000ppm. Starting a heating power supply to heat, wherein a temperature thermocouple is arranged in the pot; is heated toAt 600 ℃, the zinc alloy starts to melt, and is continuously heated to 680 ℃ to enter automatic heat preservation, wherein the temperature fluctuation range is +/-10 ℃; heating the heat-preservation heat-conduction pipe, and setting the heat-preservation temperature to 700 ℃; vacuumizing the atomizing chamber, filling argon into the atomizing chamber to 110KPa, enabling the oxygen content of the atmosphere in the atomizing chamber to reach 2400-2500 ppm, starting a high-speed motor at the rotating speed of 45000 rpm, and enabling the rotating cup to reach the atomizing rotating speed; opening a liquid discharging switch of the melting pot, and putting the zinc liquid into a rotary cup of an atomizing chamber for atomization; and (4) enabling the atomized columnar zinc powder to fall into a powder collecting tank at the bottom of the atomization chamber, and taking down the tank to obtain the columnar zinc powder.
Claims (4)
1. A preparation method of columnar zinc powder is characterized by comprising the following steps:
(1) heating and melting metal zinc or zinc alloy in a melting furnace, keeping superheat degree above melting point, and making molten liquid flow into a rotary cup of an atomizing chamber through a heat-preservation flow guide pipe;
(2) and starting a motor of the rotating cup, wherein the rotating cup is provided with uniform through micropores, and the molten liquid is thrown to the atomizing chamber filled with protective gas through the through micropores to form columnar zinc or zinc alloy powder.
2. The method for producing a zinc powder in the shape of columns as defined in claim 1, wherein:
(1) the metal zinc or zinc alloy keeps the superheat temperature range of 10-200 ℃ above the melting point;
(2) vacuumizing the atomizing chamber, and then filling protective gas under the pressure of 90-115 KPa to ensure that the oxygen content of the protective gas atmosphere is 50-3000 ppm;
(3) the rotating speed range of the atomizing motor is 3000-60000 r/min;
(4) zinc or zinc alloy liquid flows into the rotary cup of the atomizing chamber through the heat-preservation flow guide pipe, and the heat preservation temperature range is 50-300 ℃ above the melting point of the zinc or zinc alloy.
3. The method for producing a columnar zinc powder as defined in claim 2, characterized in that: the aperture of the through micro-hole of the rotating cup is 10-1000 μm.
4. The production method of a columnar zinc powder as defined in claim 3, characterized in that: the rotary cup is made of metal or ceramic materials, the bottom end of the cup is provided with threads, and the rotary cup is arranged on a high-speed motor; the heat preservation flow guide pipe is electrically heated, the temperature is measured by a thermocouple, and the temperature is controlled by a PLC; the protective gas filled in the atomizing chamber is nitrogen or inert gas; the diameter of the columnar powder obtained by atomization is adjusted to be 10-600 μm and the length is 50-1000 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410168297.2A CN103949650A (en) | 2014-04-25 | 2014-04-25 | Preparation method of columnar zinc powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410168297.2A CN103949650A (en) | 2014-04-25 | 2014-04-25 | Preparation method of columnar zinc powder |
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| CN103949650A true CN103949650A (en) | 2014-07-30 |
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| CN201410168297.2A Pending CN103949650A (en) | 2014-04-25 | 2014-04-25 | Preparation method of columnar zinc powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470645A (en) * | 2017-08-22 | 2017-12-15 | 重庆大学 | The method that revolving cup centrifugal granulation prepares aluminum shot |
Citations (8)
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|---|---|---|---|---|
| GB1135719A (en) * | 1967-03-28 | 1968-12-04 | St Joseph Lead Co | An improved method of making a lead or lead alloy structure such as a sheet or foil |
| JPH04337017A (en) * | 1991-05-13 | 1992-11-25 | Kubota Corp | Apparatus for producing metallic powder |
| CN2361412Y (en) * | 1999-02-02 | 2000-02-02 | 袁富昌 | Equipment for making metallic powder using centrifugation |
| JP2000073109A (en) * | 1998-08-30 | 2000-03-07 | Shinkoo Flex:Kk | Production of granular body of magnesium or magnesium alloy |
| CN1657203A (en) * | 2004-12-31 | 2005-08-24 | 云南锡业集团有限责任公司 | Nonferrous metal powder |
| CN201410563Y (en) * | 2009-06-15 | 2010-02-24 | 连云港倍特超微粉有限公司 | Water-drenching quenching device |
| CN102017243A (en) * | 2008-04-22 | 2011-04-13 | 吉列公司 | Centrifugal atomization for producing zinc powder |
| CN103068731A (en) * | 2010-05-18 | 2013-04-24 | 爱科控股公司 | Spherical powder and its preparation |
-
2014
- 2014-04-25 CN CN201410168297.2A patent/CN103949650A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1135719A (en) * | 1967-03-28 | 1968-12-04 | St Joseph Lead Co | An improved method of making a lead or lead alloy structure such as a sheet or foil |
| JPH04337017A (en) * | 1991-05-13 | 1992-11-25 | Kubota Corp | Apparatus for producing metallic powder |
| JP2000073109A (en) * | 1998-08-30 | 2000-03-07 | Shinkoo Flex:Kk | Production of granular body of magnesium or magnesium alloy |
| CN2361412Y (en) * | 1999-02-02 | 2000-02-02 | 袁富昌 | Equipment for making metallic powder using centrifugation |
| CN1657203A (en) * | 2004-12-31 | 2005-08-24 | 云南锡业集团有限责任公司 | Nonferrous metal powder |
| CN102017243A (en) * | 2008-04-22 | 2011-04-13 | 吉列公司 | Centrifugal atomization for producing zinc powder |
| CN201410563Y (en) * | 2009-06-15 | 2010-02-24 | 连云港倍特超微粉有限公司 | Water-drenching quenching device |
| CN103068731A (en) * | 2010-05-18 | 2013-04-24 | 爱科控股公司 | Spherical powder and its preparation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470645A (en) * | 2017-08-22 | 2017-12-15 | 重庆大学 | The method that revolving cup centrifugal granulation prepares aluminum shot |
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Application publication date: 20140730 |