CN1696099A - Method for preparing zinc acetate in high purity - Google Patents
Method for preparing zinc acetate in high purity Download PDFInfo
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- CN1696099A CN1696099A CN 200410038170 CN200410038170A CN1696099A CN 1696099 A CN1696099 A CN 1696099A CN 200410038170 CN200410038170 CN 200410038170 CN 200410038170 A CN200410038170 A CN 200410038170A CN 1696099 A CN1696099 A CN 1696099A
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- zinc acetate
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Abstract
A process for preparing high-purity zinc acetate includes reaction, purifying by immersing zinc in high-temp saturated alkaline solution of zinc acetate for reducing heavy metal ions and depositing impurities, separating, adding glacial acetic acid to said solution for increasing output, educing out and dewatering.
Description
Technical Field
The invention relates to a method for preparing high-purity zinc acetate, in particular to a method for preparing high-purity zinc acetate which can ensure that products do not contain other heavy metal impurities.
Background
According to the traditional method for preparing zinc acetate, glacial acetic acid and water are mostly added into zinc oxide powder (namely zinc oxide) to react to generate zinc acetate containing crystal water, and the main reaction formula is as follows:
the reaction releases heat to raise the temperature of the solution, after the reaction is finished for aperiod of time to form a saturated solution of zinc acetate, the temperature of the solution is lowered to enable the saturated solution of the zinc acetate solution to become a supersaturated solution to precipitate crystals of the zinc acetate, and the precipitated crystals of the zinc acetate are dehydrated to form the required zinc acetate crystals.
However, since the zinc oxide powder contains other heavy metal impurities such as lead, cadmium, copper, iron, etc., the obtained zinc acetate powder is also mixed with the above heavy metal impurities, and the purity of zinc acetate crystals of the product cannot be effectively improved.
Conventionally, a small amount of zinc sulfate is added into a zinc acetate solution, so that lead impurities in the solution are replaced by lead sulfate precipitates to be removed, but other heavy metal impurities such as cadmium, copper, iron and the like cannot be removed.
In addition, when the above-mentioned main reaction is carried out, the following reactions are generally carried out simultaneously:
because partial zinc ions can form basic zinc acetate ions (namely basic zinc acetate ions) during the reaction, after the acetate ions and the zinc ions normally react to form the zinc acetate, no redundant acetate ions react with the basic zinc acetate ions to generate the zinc acetate, and therefore, the yield of the zinc acetate cannot be improved.
Disclosure of Invention
In view of the above, the present inventors have studied to solve the above two problems of zinc acetate during manufacturing, and have made extensive experiments and efforts to develop the present invention.
The invention mainly aims to provide a method for preparing zinc acetate with high yield and high purity.
In order to achieve the above object, the present invention adopts the following technical means, wherein the present invention comprises:
the reaction steps are as follows: putting zinc acetate mother liquor and zinc oxide powder into a reaction tank, and then adding glacial acetic acid in a proper amount until the zinc oxide powder is completely dissolved to form basic zinc acetate high-temperature saturated solution;
a purification step: soaking a zinc object in the solution to reduce heavy metal ions of impurities to be attached to the zinc object, wherein partial impurity metals form precipitates;
a separation step: the saturated solution of zinc acetate is extracted and separated to another reaction tank;
and (3) yield increasing step: adding glacial acetic acid into a high-temperature saturated solution of basic zinc acetate, and stirring to perform subsequent reaction;
a precipitation step: continuously stirring and cooling a saturated solution of zinc acetate added with glacial acetic acid to obtain a supersaturated solution of zinc acetate so as to separate out zinc acetate crystals;
a dehydration step: the method is characterized in that zinc acetate crystals and a cooled zinc acetate saturated solution are subjected to solid-liquid separation, the zinc acetate crystals are centrifugally dehydrated to form zinc acetate crystals, and the zinc acetate solution is used as zinc acetate mother liquor for recycling.
Through the purification steps, the impurity metal can be reduced into metal powder for separation, and the basic zinc acetate ions can continue to react into zinc acetate by the yieldincreasing step, so that the yield of the zinc acetate can be increased.
Detailed Description
The method of carrying out the present invention will now be described in detail. The preparation method of the high-purity zinc acetate comprises a reaction step, a purification step, a separation step, a yield increasing step, a precipitation step and a filtering and drying step, wherein the detailed preparation process of each step is as follows:
the reaction steps are as follows: putting zinc acetate mother liquor and zinc oxide powder into a reaction tank, adding glacial acetic acid in a proper amount until the zinc oxide powder is completely dissolved, wherein the pH value is about 5.5-5, and keeping the temperature at 90-100 ℃ to form basic zinc acetate high-temperature saturated solution which has the following two reactions respectively.
A purification step: the method comprises the step of soaking zinc objects such as zinc plates, zinc strips, zinc particles, zinc balls and zinc powder in the solution for 20-40 minutes to reduce metal ions of impurities into metal powder to be attached to the zinc objects, and part of the impurity metals form precipitates. The reduction reaction formula of lead is shown as follows:
a separation step: the saturated solution of zinc acetate is extracted and separated to another reaction tank.
And (3) yield increasing step: glacial acetic acid is added into a saturated basic zinc acetate solution to maintain the pH value of the saturated basic zinc acetate solution between 4.5 and 3.5, and the mixture is stirred to carry out subsequent reaction, wherein the reaction formula is as follows:
a precipitation step: the saturated solution of zinc acetate added with glacial acetic acid is continuously stirred and cooled to form a supersaturated solution of zinc acetate so as to separate out zinc acetate crystals.
A dehydration step: the method is characterized in that zinc acetate crystals and a cooled zinc acetate saturated solution are subjected to solid-liquid separation, the zinc acetate crystals are centrifugally dehydrated to form zinc acetate crystals, and the zinc acetate solution is used as zinc acetate mother liquor for recycling.
In addition, when the mother liquor of zinc acetate recovered is recovered and used, impurities in the mother liquor are removed through a purification step and a separation step, and then high-purity zinc acetate is produced through the reaction step, the yield increasing step, the precipitation step and the dehydration step.
In summary, the present invention utilizes the purification step to reduce and separate the impurity metals, and utilizes the yield increasing step to continue the reaction of the basic zinc acetate ions into zinc acetate, thereby increasing the yield of zinc acetate.
Claims (6)
1. A method for preparing high-purity zinc acetate is characterized by comprising the following steps:
the reaction steps are as follows: putting zinc acetate mother liquor and zinc oxide powder into a reaction tank, and then adding glacialacetic acid in a proper amount until the zinc oxide powder is completely dissolved to form basic zinc acetate high-temperature saturated solution;
a purification step: soaking a zinc object in the solution to reduce heavy metal ions of impurities into metal to be attached to the zinc object, wherein part of the impurity metal is formed into precipitate;
a separation step: extracting and separating the high-temperature saturated solution of basic zinc acetate into another reaction tank to separate impurity metals;
and (3) yield increasing step: adding glacial acetic acid into a high-temperature saturated solution of basic zinc acetate, and stirring to perform subsequent reaction;
a precipitation step: continuously stirring and cooling a saturated solution of zinc acetate added with glacial acetic acid to obtain a supersaturated solution of zinc acetate so as to separate out zinc acetate crystals;
a dehydration step: the method is characterized in that zinc acetate crystals and a cooled zinc acetate saturated solution are subjected to solid-liquid separation, the zinc acetate crystals are centrifugally dehydrated to form zinc acetate crystals, and the zinc acetate solution is used as zinc acetate mother liquor for recycling.
2. The method for producing high purity zinc acetate according to claim 1 wherein the mother liquor of recovered zinc acetate is subjected to a purification step and a separation step to remove impurities in the mother liquor, and then subjected to the reaction step, the yield-increasing step, the precipitation step and the dehydration step to produce high purity zinc acetate.
3. The method for producing high-purity zinc acetate according to claim 1 or 2, wherein the temperature in the reaction step is 90 ℃ to 100 ℃.
4. The method of claim 1 or 2, wherein the pH of the reacting step is between about 5.5 and about 5.
5. The process for producing high purity zinc acetate according to claim 1 or 2, wherein the zinc objects used in the purification step are zinc plates, zinc strips, zinc particles, zinc spheres, zinc powder.
6. The method for producing high-purity zinc acetate according to claim 1 or 2, wherein the pH value of the yield-increasing step is maintained between 4.5 and 3.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410038170 CN1696099A (en) | 2004-05-11 | 2004-05-11 | Method for preparing zinc acetate in high purity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410038170 CN1696099A (en) | 2004-05-11 | 2004-05-11 | Method for preparing zinc acetate in high purity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1696099A true CN1696099A (en) | 2005-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200410038170 Pending CN1696099A (en) | 2004-05-11 | 2004-05-11 | Method for preparing zinc acetate in high purity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649889A (en) * | 2015-02-09 | 2015-05-27 | 吉林市弗兰达科技股份有限公司 | Acetic acid raw material for producing metal acetate as well as preparation method and special equipment thereof |
| CN105408258A (en) * | 2013-07-16 | 2016-03-16 | 黑达乐格瑞菲工业有限公司 | Preparation and use of zinc compounds |
-
2004
- 2004-05-11 CN CN 200410038170 patent/CN1696099A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105408258A (en) * | 2013-07-16 | 2016-03-16 | 黑达乐格瑞菲工业有限公司 | Preparation and use of zinc compounds |
| CN104649889A (en) * | 2015-02-09 | 2015-05-27 | 吉林市弗兰达科技股份有限公司 | Acetic acid raw material for producing metal acetate as well as preparation method and special equipment thereof |
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