CN102274964A - Mercury-free alkaline zinc powder - Google Patents
Mercury-free alkaline zinc powder Download PDFInfo
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- CN102274964A CN102274964A CN2011102341204A CN201110234120A CN102274964A CN 102274964 A CN102274964 A CN 102274964A CN 2011102341204 A CN2011102341204 A CN 2011102341204A CN 201110234120 A CN201110234120 A CN 201110234120A CN 102274964 A CN102274964 A CN 102274964A
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Abstract
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 mercury-free alkaline zinc powder has very low hydrogen absorption, the qualification rate of gas evolution at 60 ℃ of less than 0.03ml/5g3d can reach 96 percent, the gas evolution at 60 ℃ of 0.03-0.05 ml/5g3d only accounts for 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 providing mercury-free alkaline zinc powder and a preparation method thereof aiming at the defects in the background technology.
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 screens of the double-layer screen 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 less than or equal to 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 the temperature of 0.03-0.05 ml/5g3d60 ℃, 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.
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 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.
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 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 was 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, and 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 (4)
1. A mercury-free alkaline zinc powder comprises zinc powder and metal additives, and is characterized in that: the metal additive consists of 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.
2. The mercury-free basic zinc powder as defined in claim 1, characterized by 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 in the step c in a mixer to ensure that the particle size of the zinc powder is more uniform, and carrying out vacuum packaging and delivery.
3. The mercury-free basic zinc powder as defined in claim 2, wherein: 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 ℃.
4. Mercury-free basic zinc powder according to claim 2, characterized in that: in the step c, the upper and lower sieves of the double-layer sieve are respectively 40 meshes and 250 meshes.
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| CN 201110234120 CN102274964B (en) | 2011-08-16 | 2011-08-16 | Mercury-free alkaline zinc powder |
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| CN102274964B CN102274964B (en) | 2013-05-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100718A (en) * | 2012-12-28 | 2013-05-15 | 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 |
Citations (5)
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|---|---|---|---|---|
| US5425913A (en) * | 1990-02-08 | 1995-06-20 | S.A.Acec-Union Miniere N.V. | Zinc alloy for electrochemical battery cans |
| 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 |
| CN101447568A (en) * | 2008-12-26 | 2009-06-03 | 深圳市中金岭南科技有限公司 | Rare earth alloy battery zinc powder |
| CN101667639A (en) * | 2009-10-20 | 2010-03-10 | 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 |
-
2011
- 2011-08-16 CN CN 201110234120 patent/CN102274964B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5425913A (en) * | 1990-02-08 | 1995-06-20 | S.A.Acec-Union Miniere N.V. | Zinc alloy for electrochemical battery cans |
| 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 |
| CN101447568A (en) * | 2008-12-26 | 2009-06-03 | 深圳市中金岭南科技有限公司 | Rare earth alloy battery zinc powder |
| CN101667639A (en) * | 2009-10-20 | 2010-03-10 | 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100718A (en) * | 2012-12-28 | 2013-05-15 | 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 |
| 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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Owner name: XINXIANG CITY TIANLI ENERGY MATERIALS CO., LTD. Free format text: FORMER NAME: XINXIANG TIANLI ENERGY MATERIALS CO., LTD. |
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Address after: Wang Zhoucun village in Xinxiang city in 453000 weeks Silu middle Henan Province Patentee after: Xinxiang Tianli Li Limited by Share Ltd Address before: The middle Silu Wang Cun Zhen Zhou Xinxiang city of Henan Province in 453000 Patentee before: Xinxiang Tianli Energy Materials Co.,Ltd. |