CN102274964B - Mercury-free alkaline zinc powder - Google Patents
Mercury-free alkaline zinc powder Download PDFInfo
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- CN102274964B CN102274964B CN 201110234120 CN201110234120A CN102274964B CN 102274964 B CN102274964 B CN 102274964B CN 201110234120 CN201110234120 CN 201110234120 CN 201110234120 A CN201110234120 A CN 201110234120A CN 102274964 B CN102274964 B CN 102274964B
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Abstract
The mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals, wherein the indium and the bismuth respectively account for 0.03-0.04% of the weight of the zinc, the cerium accounts for 0.01-0.015% of the weight of the zinc, the calcium accounts for 0.025% of the weight of the zinc, and the magnesium and the aluminum respectively account for 0.004-0.005% of the weight of the zinc. The mercury-free alkaline zinc powder has very low hydrogen absorption amount, the qualification rate of gas evolution amount at 60 ℃ of less than 0.03ml/5g3d can reach 96 percent, the qualification rate at 60 ℃ of 0.03-0.05 ml/5g3d is only 4 percent, and after the mercury-free alkaline zinc powder is made into a zinc-manganese battery, the battery has heavy current discharge. Because of adding rare earth metal cerium, the discharge time is longer, the discharge time can reach 180-200 minutes, and because of the characteristic of low hydrogen absorption amount, the safety performance of the battery is fully guaranteed.
Description
Technical Field
The invention belongs to the technical field of alkaline battery materials, and particularly relates to mercury-free alkaline zinc powder and a preparation method thereof.
Background
China is a big country for producing zinc-manganese batteries, the annual output reaches 200 hundred million, and the zinc used by the batteries accounts for about 25 percent of the total consumption of zinc. The mercury-free zinc powder is a key raw material for producing the mercury-free alkaline manganese battery, the mercury-free zinc powder for the alkaline manganese battery is developed, the requirement of manufacturing green and environment-friendly alkaline batteries in China is met, expensive imported zinc powder is replaced, and the reduction of the manufacturing cost of the battery is a very urgent task.
At present, the zinc-manganese battery manufactured by using zinc powder developed in China has small current magnitude and poor continuous discharge performance.
Disclosure of Invention
The invention aims to solve the technical problem of the background art and provides mercury-free alkaline zinc powder and a preparation method thereof.
In order to solve the technical problems, the following technical scheme is adopted: a mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals, wherein the indium and the bismuth respectively account for 0.03-0.04% of the weight of the zinc, the cerium accounts for 0.01-0.015% of the weight of the zinc, the calcium accounts for 0.025% of the weight of the zinc, and the magnesium and the aluminum respectively account for 0.004-0.005% of the weight of the zinc.
The preparation method comprises the following steps: a. weighing metal additives according to calculation, putting the metal additives and zinc ingots into an induction smelting furnace, heating and smelting at 500-600 ℃ to completely melt the metal additives, and stirring to uniformly melt the metal additives and the zinc ingots to form zinc liquid;
b. b, pouring the zinc liquid obtained in the step a into a constant temperature box, enabling the zinc liquid to flow into a small pot before spraying at a constant speed through the constant temperature box, blowing and spraying compressed air at a nozzle through a nozzle below the small pot to form zinc particles, enabling the zinc particles to enter a high-pressure spray granulation tower, and cooling the granulation tower to form zinc powder;
c. b, directly feeding the zinc powder discharged from the lower part of the high-pressure spray granulation tower in the step b into a double-layer sieve for primary screening, and feeding the sieved substances into the double-layer sieve for secondary screening to remove coarse powder and fine powder to obtain a finished zinc powder product;
d. and finally, uniformly mixing the zinc powder obtained in the step c in a mixer to ensure that the granularity of the zinc powder is more uniform, and carrying out vacuum packaging and delivery.
In the step b, the constant speed is 320kg/h; gas pressure in the nozzle: 7-7.5 Mpa, temperature: 500-550 ℃; the pressure in the granulating tower is 4.5-5 Mpa, and the cooling temperature is 15-20 ℃.
In the step c, the upper and lower sieves of the double-layer sieve are respectively 40 meshes and 250 meshes.
The mercury-free alkaline zinc powder has very low hydrogen absorption amount which is less than 0.03ml/5g3d60 ℃ (the gas evolution amount is detected by an analytical instrument, the gas evolution amount has the industrial standard of not more than 0.15ml/5g3d60 ℃) and the qualification rate of the gas evolution amount can reach 96% (the measurement method is the industrial standard), the gas evolution amount accounts for only 4% at 0.03-0.05 ml/5g3d60 ℃, and after the mercury-free alkaline zinc powder is made into a zinc-manganese battery, the battery has large-current discharge. Because of adding rare earth metal cerium, the discharge time is longer, the discharge time can reach 180-200 minutes, and because of the characteristic of low hydrogen absorption amount, the safety performance of the battery is fully ensured.
Detailed Description
Example 1
A mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals.
Wherein indium and bismuth respectively account for 0.03 percent of the weight of zinc, cerium accounts for 0.015 percent of the weight of zinc, calcium accounts for 0.025 percent of the weight of zinc, and magnesium and aluminum respectively account for 0.004 percent of the weight of zinc.
The preparation method comprises the following steps: a. weighing metal additives according to calculation, putting the metal additives and zinc ingots into an induction smelting furnace, heating and smelting at 500-600 ℃ to completely melt the metal additives, and stirring to uniformly melt the metal additives and the zinc ingots to form zinc liquid;
b. b, pouring the zinc liquid obtained in the step a into a constant temperature box, enabling the zinc liquid to flow into a small pot before spraying at a constant speed through the constant temperature box, blowing and spraying compressed air at a nozzle through a nozzle below the small pot to form zinc particles, enabling the zinc particles to enter a high-pressure spray granulation tower, and cooling the granulation tower to form zinc powder;
c. b, directly feeding the zinc powder discharged from the high-pressure spray granulation tower in the step b into a double-layer sieve for primary screening, and feeding the sieved substances into the double-layer sieve for secondary screening to remove coarse powder and fine powder to obtain a zinc powder finished product;
d. and finally, uniformly mixing the zinc powder obtained in the step c in a mixer to ensure that the granularity of the zinc powder is more uniform, and carrying out vacuum packaging and delivery.
Example 2
A mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals.
Wherein indium and bismuth respectively account for 0.04 percent of the weight of zinc, cerium accounts for 0.01 percent of the weight of zinc, calcium accounts for 0.025 percent of the weight of zinc, and magnesium and aluminum respectively account for 0.005 percent of the weight of zinc.
In the step b, the constant speed is 320kg/h; gas pressure in the nozzle: 7-7.5 Mpa, temperature: 500-550 ℃; the pressure in the granulating tower is 4.5-5 Mpa, and the cooling temperature is 15-20 ℃.
In the step c, the upper and lower sieves of the double-layer sieve are respectively 40 meshes and 250 meshes.
The rest is the same as example 1.
Example 3
A mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals.
Wherein indium accounts for 0.03 percent of the weight of zinc, bismuth accounts for 0.04 percent of the weight of zinc, cerium accounts for 0.012 percent of the weight of zinc, calcium accounts for 0.025 percent of the weight of zinc, magnesium accounts for 0.004 percent of the weight of zinc, and aluminum accounts for 0.005 percent of the weight of each zinc.
In the step b, the constant speed is 320kg/h; gas pressure in the nozzle: 7Mpa, temperature: 550 ℃; the pressure in the granulation tower was 4.5 deg.C and the cooling temperature was 20 deg.C.
The rest is the same as example 2.
Example 4
A mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals.
Wherein indium accounts for 0.04 percent of the weight of zinc, bismuth accounts for 0.03 percent of the weight of zinc, cerium accounts for 0.014 percent of the weight of zinc, calcium accounts for 0.025 percent of the weight of zinc, magnesium accounts for 0.005 percent of the weight of zinc, aluminum accounts for 0.004 percent of the weight of zinc.
In the step b, the constant speed is 320kg/h; gas pressure in the nozzle: 7.5MPa, temperature: 500 deg.C; the pressure in the granulation tower is 5Mpa, and the cooling temperature is 15 ℃.
The rest is the same as example 2.
Example 5
A mercury-free alkaline zinc powder comprises zinc powder and metal additive, wherein the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals.
Wherein indium and bismuth each account for 0.035%, cerium 0.013%, calcium 0.025%, and magnesium and aluminum each account for 0.0045%.
The rest is the same as example 1.
Claims (1)
1. A mercury-free alkaline zinc powder comprises zinc powder and metal additives, and is characterized in that: the metal additive comprises indium, bismuth and cerium in rare earth metals and calcium, magnesium and aluminum in non-rare earth metals, wherein the indium and the bismuth respectively account for 0.03 to 0.04 percent of the weight of the zinc, the cerium accounts for 0.01 to 0.015 percent of the weight of the zinc, the calcium accounts for 0.025 percent of the weight of the zinc, and the magnesium and the aluminum respectively account for 0.004 to 0.005 percent of the weight of the zinc;
the preparation method comprises the following steps: a. weighing metal additives according to calculation, putting the metal additives and zinc ingots into an induction smelting furnace, heating and smelting at 500-600 ℃ to completely melt the metal additives, and stirring to uniformly melt the metal additives and the zinc ingots to form zinc liquid;
b. pouring the zinc liquid obtained in the step a into a constant temperature box, enabling the zinc liquid to flow into a small pot before spraying at a constant speed of 320kg/h through the constant temperature box, enabling the zinc liquid to pass through a nozzle below the small pot, and enabling the gas pressure in the nozzle to be as follows: 7-7.5 Mpa, temperature: at 500-550 ℃, under the blowing of compressed air at a nozzle, zinc particles are formed and enter a high-pressure spray granulation tower, the zinc particles are formed through the cooling of the granulation tower, and the pressure in the granulation tower is as follows: 4.5-5 Mpa, cooling temperature: 15 to 20 ℃;
c. b, directly feeding the zinc powder discharged from the lower part of the high-pressure spray granulation tower in the step b into a double-layer sieve for primary screening, feeding the sieved substances into the double-layer sieve for secondary screening, wherein the upper and lower screens of the double-layer sieve are respectively 40 meshes and 250 meshes, and screening coarse powder and fine powder to obtain a finished zinc powder product;
d. and finally, uniformly mixing the zinc powder obtained in the step c in a mixer to ensure that the granularity of the zinc powder is more uniform, and carrying out vacuum packaging and delivery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110234120 CN102274964B (en) | 2011-08-16 | 2011-08-16 | Mercury-free alkaline zinc powder |
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| CN 201110234120 CN102274964B (en) | 2011-08-16 | 2011-08-16 | Mercury-free alkaline zinc powder |
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| CN102274964B true CN102274964B (en) | 2013-05-01 |
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| CN103100718B (en) * | 2012-12-28 | 2015-06-17 | 深圳市中金岭南科技有限公司 | Preparation method for flake zinc powder containing indium and bismuth and aluminum and calcium |
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| BE1003681A6 (en) * | 1990-02-08 | 1992-05-19 | Acec Union Miniere | Zinc alloy for sleeves for electrochemical batteries. |
| JP2003317710A (en) * | 2002-04-24 | 2003-11-07 | Mitsui Mining & Smelting Co Ltd | Negative electrode for alkaline manganese battery and alkaline manganese battery using the same |
| CN101447568B (en) * | 2008-12-26 | 2011-04-20 | 深圳市中金岭南科技有限公司 | Rare earth alloy battery zinc powder |
| CN101667639B (en) * | 2009-10-20 | 2014-08-06 | 深圳市中金岭南科技有限公司 | Method for manufacturing rare earth alloy battery zinc powder |
| CN101937995A (en) * | 2010-08-30 | 2011-01-05 | 江门市三七电池实业有限公司 | Zinc powder for alkaline manganese battery |
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