CN112010341A - Production method of zinc sulfate heptahydrate - Google Patents
Production method of zinc sulfate heptahydrate Download PDFInfo
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- CN112010341A CN112010341A CN202010786679.7A CN202010786679A CN112010341A CN 112010341 A CN112010341 A CN 112010341A CN 202010786679 A CN202010786679 A CN 202010786679A CN 112010341 A CN112010341 A CN 112010341A
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- zinc sulfate
- sulfate heptahydrate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/06—Sulfates
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- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention provides a production method of zinc sulfate heptahydrate, which comprises the following steps: adding zinc oxide into a solution containing 15-35% sulfuric acid, starting steam to fully heat and stir, wherein the mass ratio of the zinc oxide to the solution is 1: 6-8; stirring and steam heating are started, lime milk is added to adjust the pH value to be acidic, the temperature is heated to 70-80 ℃, and the reaction is controlled at the temperature for 30min-1 h; adding 30% hydrogen peroxide into the solution, and reacting for 1 h; and (3) feeding the filtrate and the washing liquid into evaporation equipment, heating and evaporating under the condition of slow stirring until a small amount of crystals are separated out, stopping heating, cooling, preserving heat, and filtering or centrifuging to obtain crystals, namely zinc sulfate heptahydrate and clear liquid. The production method of zinc sulfate heptahydrate disclosed by the invention has the advantages of easily controlled experimental conditions, suitability for economy, reasonability and environmental protection, and is worthy of popularization.
Description
Technical Field
The invention relates to the technical field of inorganic chemical industry, in particular to a production method of zinc sulfate heptahydrate.
Background
Zinc sulfate heptahydrate (ZnSO4 & 7H2O), also known as Zinc alum and Zinc sulphate, is usually a white crystal. The density of the water-soluble organic fertilizer is 1.975g/cm3, the melting point is 100 ℃, the water-soluble organic fertilizer is easily dissolved in water, and the water-soluble organic fertilizer gradually weathers in dry air. It is an important inorganic chemical raw material and has wide application in various industrial fields. Zinc sulfate is widely applied to the field of medical treatment and health of industrial and agricultural machines, and the demand of the zinc sulfate is increasing year by year. Zinc sulfate is used as raw material for preparing lithopone and zinc salt, and also as auxiliary raw material for anticorrosion of wood and leather, clarifying bone glue and precipitating agent for artificial fibre. The inhibitor is used as a bacteriostatic agent in ore dressing, the consumption is generally 500-1200 g/t ore, and the inhibitor is used for preparing electrolyte in the electroplating industry. Except for fruit tree scour prevention, the fertilizer is mainly used as a trace element fertilizer (accounting for about 70 percent) in agriculture, and according to introduction, a small amount of zinc fertilizer is applied to soil, so that the crop yield can be improved by about 15 percent. In addition, zinc is regarded as one of the essential trace elements of human body and is emphasized by people, the zinc sulfate syrup or sugar tablet product in modern medicine is a good medicine for preventing and treating zinc deficiency of human body, and trace amount of zinc is added into animal feed as a nutrient, so that the growth and development of individuals can be promoted.
In the production of chemical industry, the zinc sulfate heptahydrate is a crystallized product which is separated out by cooling a concentrated zinc sulfate saturated solution. How to effectively prepare the high-purity heptahydrate zinc sulfate crystal in industrial production is a technical problem to be solved by the invention.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides a production method of zinc sulfate heptahydrate, which is suitable for economy, reasonability and environmental protection.
In order to achieve the above purpose, the invention adopts the following technical scheme: a production method of zinc sulfate heptahydrate comprises the following steps:
s1: adding zinc oxide into a solution containing 15-35% sulfuric acid, starting steam to fully heat and stir, wherein the mass ratio of the zinc oxide to the solution is 1: 6-8;
s2: stirring and steam heating are started, lime milk is added to adjust the pH value to be acidic, the temperature is heated to 70-80 ℃, and the reaction is controlled at the temperature for 30min-1 h;
s3: adding 30% hydrogen peroxide into the solution, and reacting for 1 h;
s4: and (3) feeding the filtrate and the washing liquid into evaporation equipment, heating and evaporating under the condition of slow stirring until a small amount of crystals are separated out, stopping heating, cooling, preserving heat, and filtering or centrifuging to obtain crystals, namely zinc sulfate heptahydrate and clear liquid.
Preferably, in step S1, the heating temperature is 60 ℃ to 80 ℃.
Preferably, in step S1, the reaction time is 2h-4 h.
Preferably, in step S2, the pH value is adjusted to 4-5.5.
Preferably, in step S3, hydrogen peroxide is added in a volume ratio of 1:8 to the solution.
Preferably, in step S4, the temperature is reduced to 15-25 ℃.
Preferably, in step S4, the heat preservation time is 10-40 min.
Compared with the prior art, the invention has the beneficial effects.
The preparation method of the zinc sulfate heptahydrate crystal provided by the invention is simple and easy to control in operation conditions. In addition, the method has high utilization rate of raw materials, and few wastes produced in the production process, thereby being a very economic and effective method.
Detailed Description
The working principle and the using method of the invention are as follows:
three kinds of waste acid from titanium dioxide production are selected and treated by the method of the invention respectively.
Example 1: a production method of zinc sulfate heptahydrate comprises the following steps:
s1: adding zinc oxide into a solution containing 35% sulfuric acid, starting steam to fully heat and stir, wherein the mass ratio of the zinc oxide to the solution is 1: 8;
s2: stirring and steam heating are started, lime milk is added to adjust the pH value to be acidic, heating is carried out to 80 ℃, and the temperature is controlled to react for 1 h;
s3: adding 30% hydrogen peroxide into the solution, and reacting for 1 h;
s4: and (3) feeding the filtrate and the washing liquid into evaporation equipment, heating and evaporating under the condition of slow stirring until a small amount of crystals are separated out, stopping heating, cooling, preserving heat, and filtering or centrifuging to obtain crystals, namely zinc sulfate heptahydrate and clear liquid.
Preferably, in step S1, the heating temperature is 80 ℃.
Preferably, in step S1, the reaction time is 4 h.
Preferably, in step S2, the PH is adjusted to 5.5.
Preferably, in step S3, hydrogen peroxide is added in a volume ratio of 1:8 to the solution.
Preferably, in step S4, the temperature is reduced to 25 ℃.
Preferably, in step S4, the heat preservation time is 40min
Example 2: a production method of zinc sulfate heptahydrate comprises the following steps:
s1: adding zinc oxide into a solution containing 15-35% sulfuric acid, starting steam to fully heat and stir, wherein the mass ratio of the zinc oxide to the solution is 1: 6-8;
s2: stirring and steam heating, adding lime milk to adjust pH to acidity, heating to 70 deg.C, and reacting at the temperature for 30 min;
s3: adding 30% hydrogen peroxide into the solution, and reacting for 1 h;
s4: and (3) feeding the filtrate and the washing liquid into evaporation equipment, heating and evaporating under the condition of slow stirring until a small amount of crystals are separated out, stopping heating, cooling, preserving heat, and filtering or centrifuging to obtain crystals, namely zinc sulfate heptahydrate and clear liquid.
Preferably, in step S1, the heating temperature is 60 ℃.
Preferably, in step S1, the reaction time is 2 h.
Preferably, in step S2, the pH value is adjusted to 4-5.5.
Preferably, in step S3, hydrogen peroxide is added in a volume ratio of 1:8 to the solution.
Preferably, in step S4, the temperature is reduced to 15 ℃.
Preferably, in step S4, the heat retention time is 10 min.
Example 3: a production method of zinc sulfate heptahydrate comprises the following steps:
s1: adding zinc oxide into a solution containing 15-35% sulfuric acid, starting steam to fully heat and stir, wherein the mass ratio of the zinc oxide to the solution is 1: 6-8;
s2: stirring and steam heating, adding lime milk to adjust pH to acidity, heating to 75 deg.C, and reacting at the temperature for 45 min;
s3: adding 30% hydrogen peroxide into the solution, and reacting for 1 h;
s4: and (3) feeding the filtrate and the washing liquid into evaporation equipment, heating and evaporating under the condition of slow stirring until a small amount of crystals are separated out, stopping heating, cooling, preserving heat, and filtering or centrifuging to obtain crystals, namely zinc sulfate heptahydrate and clear liquid.
Preferably, in step S1, the heating temperature is 70 ℃.
Preferably, in step S1, the reaction time is 3 h.
Preferably, in step S2, the PH is adjusted to 5.
Preferably, in step S3, hydrogen peroxide is added in a volume ratio of 1:8 to the solution.
Preferably, in step S4, the temperature is reduced to 20 ℃.
Preferably, in step S4, the heat retention time is 30 min.
The present invention is not limited to the above embodiments, and various combinations and modifications of the above technical features may be provided for those skilled in the art, and modifications, variations, equivalents, or uses of the structure or method of the present invention in other fields without departing from the spirit and scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The production method of zinc sulfate heptahydrate is characterized by comprising the following steps:
s1: adding zinc oxide into a solution containing 15-35% sulfuric acid, starting steam to fully heat and stir, wherein the mass ratio of the zinc oxide to the solution is 1: 6-8;
s2: stirring and steam heating are started, lime milk is added to adjust the pH value to be acidic, the temperature is heated to 70-80 ℃, and the reaction is controlled at the temperature for 30min-1 h;
s3: adding 30% hydrogen peroxide into the solution, and reacting for 1 h;
s4: and (3) feeding the filtrate and the washing liquid into evaporation equipment, heating and evaporating under the condition of slow stirring until a small amount of crystals are separated out, stopping heating, cooling, preserving heat, and filtering or centrifuging to obtain crystals, namely zinc sulfate heptahydrate and clear liquid.
2. The production method of zinc sulfate heptahydrate according to claim 1, wherein the heating temperature in step S1 is 60-80 ℃.
3. The method for producing zinc sulfate heptahydrate according to claim 2, wherein the reaction time in step S1 is 2-4 h.
4. The production method of zinc sulfate heptahydrate according to claim 1, wherein in step S2, the pH value is adjusted to 4-5.5.
5. The method for producing zinc sulfate heptahydrate according to claim 1, wherein in step S3, the volume ratio of hydrogen peroxide to the solution is 1: 8.
6. The production method of zinc sulfate heptahydrate according to claim 1, wherein in step S4, the temperature is reduced to 15-25 ℃.
7. The production method of zinc sulfate heptahydrate according to claim 1, wherein the heat preservation time in step S4 is 10-40 min.
8. The method for producing zinc sulfate heptahydrate according to claim 1, wherein a closed reaction vessel is adopted in the steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010786679.7A CN112010341A (en) | 2020-08-07 | 2020-08-07 | Production method of zinc sulfate heptahydrate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010786679.7A CN112010341A (en) | 2020-08-07 | 2020-08-07 | Production method of zinc sulfate heptahydrate |
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| CN112010341A true CN112010341A (en) | 2020-12-01 |
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| CN202010786679.7A Withdrawn CN112010341A (en) | 2020-08-07 | 2020-08-07 | Production method of zinc sulfate heptahydrate |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645461A (en) * | 2014-11-13 | 2016-06-08 | 张学 | Zinc sulfate heptahydrate preparation method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645461A (en) * | 2014-11-13 | 2016-06-08 | 张学 | Zinc sulfate heptahydrate preparation method |
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Application publication date: 20201201 |
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