CN104085913A - Production method of food grade high-purity zinc oxide - Google Patents
Production method of food grade high-purity zinc oxide Download PDFInfo
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- CN104085913A CN104085913A CN201410261235.6A CN201410261235A CN104085913A CN 104085913 A CN104085913 A CN 104085913A CN 201410261235 A CN201410261235 A CN 201410261235A CN 104085913 A CN104085913 A CN 104085913A
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Abstract
The invention discloses a production method of food grade high-purity zinc oxide. The production method comprises the following steps: dissolving feed grade zinc sulfate, and filtering physical impurities out; replacing heavy metal ions by using zinc chloride; precipitating calcium ions and magnesium ions by using zinc fluoride, and preparing zinc hydroxide by using a potassium hydroxide solution or a sodium hydroxide solution; and thermally decomposing the zinc hydroxide to obtain the food grade high-purity zinc oxide. According to the production method, the feed grade zinc sulfate is dissolved, the physical impurities are separated out, and the heavy metal ions are replaced by using the zinc chloride, so that the heavy metal content of an obtained final product is low; the thermal decomposition temperature is lower than that of zinc carbonate, so that the energy consumption is lowered; and during thermal decomposition, only water vapor is produced, so that pollution is avoided.
Description
Technical field
The present invention relates to a kind of production method of zinc oxide, relate in particular to a kind of production method of food grade high-purity zinc oxide.
Background technology
Zinc oxide is a kind of important industrial chemicals, is white in color to atomic yellow without grittiness powder, and nontoxic, odorless.Be intermediate oxide, be dissolved in calculation.In alkali and ammonium chloride solution, water insoluble and ethanol easily absorbs moisture and carbonic acid gas in air.Of many uses, in food, field of health care products as zinc matter supplement.Pharmaceutical industries is as surgical adhesive raw material.
Zinc oxide is produced generally pyrometallurgical method (dry method) and wet method.Dry method comprises indirect method and direct method, and wet method is also referred to as chemical method.
In the middle of dry method, connection is mainly by making zinc oxide with dioxygen oxidation after zinc ingot metal melting.Principle is as follows:
2Zn+O
2-----→2ZnO
The shortcoming of this method is: this method is high to ingredient requirement, and the quality of zinc ingot metal has directly determined the quality of zinc oxide, if heavy metal content directly causes zinc oxide heavy metal content high in zinc ingot metal;
Indirect method adopts zinc baking sand and coal fines high-temperature calcining, and the shortcoming of this method is easily to produce sulfide; In addition this method production thermo-efficiency is low, energy consumption is large, high expensive.
What wet method generally adopted is that zinc sulfate or zinc chloride precipitate by adding sodium carbonate or volatile salt to produce zinc carbonate, and zinc carbonate makes zinc oxide after decomposing.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production method of low, the free of contamination food grade high-purity zinc oxide of a kind of heavy metal content.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of production method of food grade high-purity zinc oxide, adopt wet production zinc oxide, its innovative point is: adopt feed level zinc sulfate, after dissolution filter is removed physical property impurity, with zinc chloride, displace heavy metal ion, with making zinc hydroxide with potassium hydroxide solution or sodium hydroxide solution after zinc fluoride precipitated calcium ion and magnesium ion, zinc hydroxide makes food grade zinc oxide after thermolysis.
Further, the mass ratio 1: 4～9 of described zinc chloride and feed level zinc sulfate.
Further, feed level zinc sulfate is dissolved in after water, adds zinc chloride stirring reaction after solution is heated to 47 ℃, and churning time is 1.5～2.5 hours.
Further, make centrifugal after zinc hydroxide, collect the wet crystal of zinc hydroxide, the crystal that then will wet be heated to 125～135 ℃ dry, dried feed is packed to obtain finished product through pulverizing, after screening.
Beneficial effect of the present invention:
1, the present invention adopts feed level zinc sulfate, after dissolution filter is removed physical property impurity, with zinc chloride, displaces heavy metal ion, and the heavy metal content that therefore obtains the finished product is low;
2, process heat decomposition temperature of the present invention is low zinc carbonate, reduces energy consumption;
3, in thermal decomposition process of the present invention, only produce water vapour, do not pollute;
4, the product purity that adopts method of the present invention to obtain is high, reaches 99.5%.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is elaborated.
Embodiment 1
A production method for food grade high-purity zinc oxide, comprises the following steps:
1, in dissolving pan, add water 1000L, add feed grade Zinc Sulphate Monohydrate 1500kg, add zinc chloride 2kg after being heated to 70 ℃, stirring reaction filtered after 2 hours;
2, in filtrate, add 0.8kg zinc fluoride.Stirring 1 as a child started to filter;
3, preparation potassium hydroxide solution: drop into 560kg potassium hydroxide in 1000kg water, be stirred to completely and dissolve, be cooled to room temperature stand-by;
4, potassium hydroxide solution is pumped in solution of zinc sulfate, stirring reaction 2 hours, makes zinc hydroxide precipitation;
5, centrifugal, collect the wet crystal of zinc hydroxide;
6, wet crystal is heated to 130 ℃, 3 as a child qualified rear dischargings after testing in rotary dryer;
7, dried feed is packed to obtain finished product after pulverizing, sieving.
The product of the present embodiment is white without grittiness powder, nontoxic, odorless, and its purity is 99.6%.
Claims (4)
1. the production method of a food grade high-purity zinc oxide, it is characterized in that: adopt feed level zinc sulfate, after dissolution filter is removed physical property impurity, with zinc chloride, displace heavy metal ion, with making zinc hydroxide with potassium hydroxide solution or sodium hydroxide solution after zinc fluoride precipitated calcium ion and magnesium ion, zinc hydroxide makes food grade zinc oxide after thermolysis.
2. the production method of a kind of food grade high-purity zinc oxide according to claim 1, is characterized in that: the mass ratio 1: 4～9 of described zinc chloride and feed level zinc sulfate.
3. the production method of a kind of food grade high-purity zinc oxide according to claim 1, is characterized in that: feed level zinc sulfate is dissolved in after water, adds zinc chloride stirring reaction after solution is heated to 47 ℃, and churning time is 1.5～2.5 hours.
4. the production method of a kind of food grade high-purity zinc oxide according to claim 1, it is characterized in that: make centrifugal after zinc hydroxide, collect the wet crystal of zinc hydroxide, then the crystal that will wet is heated to 125～135 ℃ and is dried, and dried feed is packed to obtain finished product after pulverizing, sieving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410261235.6A CN104085913A (en) | 2014-06-11 | 2014-06-11 | Production method of food grade high-purity zinc oxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410261235.6A CN104085913A (en) | 2014-06-11 | 2014-06-11 | Production method of food grade high-purity zinc oxide |
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| CN104085913A true CN104085913A (en) | 2014-10-08 |
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| CN201410261235.6A Pending CN104085913A (en) | 2014-06-11 | 2014-06-11 | Production method of food grade high-purity zinc oxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108185151A (en) * | 2018-02-12 | 2018-06-22 | 广州科城环保科技有限公司 | A kind of feed grade zinc oxide and preparation method thereof |
| CN108689427A (en) * | 2018-06-08 | 2018-10-23 | 广州科城环保科技有限公司 | It is a kind of to produce the method and its application that feed grade zinc oxide is recycled in mother liquor from basic zinc chloride |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759503A (en) * | 1992-01-15 | 1998-06-02 | Metals Recycling Technologies Corp. | Method for the further purification of zinc oxide |
| CN102295308A (en) * | 2011-08-15 | 2011-12-28 | 昆山德阳新材料科技有限公司 | Method for preparing zinc oxide by using zinc-containing waste liquid as raw material |
| CN102531037A (en) * | 2012-01-16 | 2012-07-04 | 沭阳县飞宏金属新材料有限公司 | Chemical preparation method of nanoscale zinc oxide powder |
| CN102627313A (en) * | 2012-04-12 | 2012-08-08 | 广汉隆达饲料有限公司 | Wet production process for feed-grade active zinc oxide |
-
2014
- 2014-06-11 CN CN201410261235.6A patent/CN104085913A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759503A (en) * | 1992-01-15 | 1998-06-02 | Metals Recycling Technologies Corp. | Method for the further purification of zinc oxide |
| CN102295308A (en) * | 2011-08-15 | 2011-12-28 | 昆山德阳新材料科技有限公司 | Method for preparing zinc oxide by using zinc-containing waste liquid as raw material |
| CN102531037A (en) * | 2012-01-16 | 2012-07-04 | 沭阳县飞宏金属新材料有限公司 | Chemical preparation method of nanoscale zinc oxide powder |
| CN102627313A (en) * | 2012-04-12 | 2012-08-08 | 广汉隆达饲料有限公司 | Wet production process for feed-grade active zinc oxide |
Non-Patent Citations (1)
| Title |
|---|
| 田伟军，邓新云: "氧化锌矿制备饲料级氧化锌工艺研究与生产应用", 《矿冶工程》, vol. 30, no. 6, 31 December 2010 (2010-12-31), pages 75 - 77 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108185151A (en) * | 2018-02-12 | 2018-06-22 | 广州科城环保科技有限公司 | A kind of feed grade zinc oxide and preparation method thereof |
| CN108689427A (en) * | 2018-06-08 | 2018-10-23 | 广州科城环保科技有限公司 | It is a kind of to produce the method and its application that feed grade zinc oxide is recycled in mother liquor from basic zinc chloride |
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Application publication date: 20141008 |