CN101112999A - Preparation process of sodium selenate - Google Patents
Preparation process of sodium selenate Download PDFInfo
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- CN101112999A CN101112999A CNA200710028912XA CN200710028912A CN101112999A CN 101112999 A CN101112999 A CN 101112999A CN A200710028912X A CNA200710028912X A CN A200710028912XA CN 200710028912 A CN200710028912 A CN 200710028912A CN 101112999 A CN101112999 A CN 101112999A
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- sodium
- solution
- sodium selenate
- selenate
- sodium selenite
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Abstract
The invention discloses a preparation technique of sodium selenate. The invention comprises the steps: 1. first proper selenium dioxide is dissolved into water to form selenious acid solution; 2. sodium hydroxide is added to adjust pH value to 7-14 to form sodium selenite; 3. hydrogen peroxide is added to fully oxidize the sodium selenite in the solution so as to form sodium selenate; 4. additive and adsorbent are added; 5. filtration, evaporation and crystallization are carried out; 6. finished products are made by heating and drying. The preparation technique of the invention is characterized by simple manufacturing technique, low investment of production equipment and easy and convenient operation and is a high efficiency and energy conservation preparation technique of sodium selenate.
Description
Technical field
The present invention relates to a kind of preparation technique of sodium selenate.
Background technology
Sodium selenate is a kind of important chemical material during glass industry is produced, mainly as required discoloring agent and the tinting material of glass production.
Common preparation technique of sodium selenate is a sodium carbonate method at present: this production technique is to prepare selenic acid earlier, yellow soda ash is joined in the selenic acid solution by a certain amount of again, again with the solution evaporation crystallization, thereby obtains the sodium selenate crystal.This production technique can produce this greenhouse gases of great amount of carbon dioxide (environment is impacted) in process of production, can produce certain danger simultaneously in industrialization is produced; The price of yellow soda ash is higher simultaneously, can increase the production cost of sodium selenate.
Summary of the invention
Purpose of the present invention mainly is to overcome the deficiency that prior art exists, and a kind of preparation technique of sodium selenate is provided.Preparation technology of the present invention has the advantages that production technique is simple, investment of production equipment is little, operate simple and convenient, is a kind of efficient, energy-conservation sodium selenate production technique.
For achieving the above object, the present invention has taked following technical scheme:
A kind of preparation technique of sodium selenate comprises following technological step:
1. in steel basin, add 1000～3000L water, add 500～1500kg tin anhydride again, and begin to stir tin anhydride and be dissolved in the water fully and form selenous acid solution;
2. in this selenous acid solution, slowly add sodium hydroxide 500～2000kg again, adjust pH value 7～14, form Sodium Selenite thereby produce;
In the such scheme, the preferred add-on of sodium hydroxide is 800～1200kg.
3. subsequently, in sodium selenite solution, add hydrogen peroxide 800～3000kg and keep design temperature to stir 20～40h down for 40～80 ℃, make the Sodium Selenite in the solution be oxidized into sodium selenate fully;
In the above-mentioned steps, preferred temperature is 40～60 ℃.
4. in above-mentioned sodium selenate solution, add additive 0.2～2kg, sorbent material 0.1～2kg, and stirred 1～5 hour;
5. then, sodium selenate solution is filtered, and be transported in the reactor, heating evaporation moisture content makes sodium selenate solution in the reactor, forms supersaturated solution, and the sodium selenate crystallization is separated out;
6. the sodium selenate that crystallization is gone out is conveyed into whizzer, dewaters; Put into baking oven after the dehydration, under 80～200 ℃ of temperature, dry, dry by the fire to sodium selenate intracrystalline water content to less than after 0.05%, cooling, pulverizing, sub-sieve are made the sodium selenate product.
Compared with prior art, the present invention has following beneficial effect:
Preparation technology of the present invention has the advantages that production technique is simple, investment of production equipment is little, operate simple and convenient, is a kind of efficient, energy-conservation sodium selenate preparation technology.
Description of drawings
Fig. 1 is preparation technology's schema of the present invention.
Embodiment
Technological principle of the present invention is as follows:
1. tin anhydride is dissolved in the water and water reaction generation selenous acid, and its chemical reaction equation is:
H
2O+SeO
2＝H
2SeO
3。
2. adding sodium hydroxide in the selenous acid solution, is to utilize the acid-base neutralisation reaction, generates Sodium Selenite.Its chemical reaction equation is:
2NaOH+H
2SeO
3＝Na
2SeO
3+2H
2O。
3. add hydrogen peroxide in the sodium selenite solution, make Sodium Selenite generation oxidizing reaction, generate sodium selenate.Its chemical negative side answers equation to be:
Na
2SeO
3+H
2O
2＝Na
2SeO
4+H
2O。
4. in the sodium selenate solution, adding the purpose of additive and sorbent material, is the characterization of adsorption that utilizes sorbent material, removes impurities in the sodium selenate solution.
5. reactor heating, sodium selenate solution evaporation dehydration crystallization; Pass through centrifugal, dehydration, stoving process again, thereby form anhydrous sodium selenate product.
The invention will be further described by specific embodiment below in conjunction with Figure of description.
Embodiment 1
A kind of preparation technique of sodium selenate comprises following technological step:
1. in steel basin, add 1000L water, add the 750kg tin anhydride again, and begin to stir tin anhydride and be dissolved in the water fully and form selenous acid solution;
2. in this selenous acid solution, slowly add sodium hydroxide 540kg and adjust pH value, thereby form sodium selenite solution.
3. subsequently, in sodium selenite solution, add hydrogen peroxide 750kg, and keep solution temperature below 80 ℃, stir 20h, Sodium Selenite in the solution is completely oxidized to is sodium selenate;
4. in above-mentioned sodium selenate solution, add additive 0.65kg, sorbent material 0.5kg, and stirred 1 hour;
5. then, sodium selenate solution is filtered, and be transported in the reactor, heating evaporation makes sodium selenate solution formation supersaturated solution in the reactor, and the sodium selenate crystallization is separated out;
6. the sodium selenate that again crystallization is gone out is conveyed into whizzer and dewaters.After the dehydration, emit in the baking oven, under 100 ℃ of temperature, dry.To sodium selenate intracrystalline water content,, make the sodium selenate product less than 0.05% postcooling, pulverizing, sub-sieve.
Embodiment 2
A kind of preparation technique of sodium selenate comprises following technological step:
1. in steel basin, add 2000L water, add the 1500kg tin anhydride again, and begin to stir.Tin anhydride is dissolved in the water fully, forms selenous acid solution;
2. in above-mentioned selenous acid solution, slowly add sodium hydroxide 1080kg, adjust pH value, thereby form sodium selenite solution.
3. subsequently, in sodium selenite solution, add hydrogen peroxide 1500kg, keep 40 ℃ of design temperatures, stir 40h.Make the Sodium Selenite in the solution, be completely oxidized to and be sodium selenate;
4. in sodium selenate solution, add additive 1.3kg, sorbent material 1kg, and stirred 5 hours;
5. then, sodium selenate solution is filtered, and be transported in the reactor.Heating evaporation makes sodium selenate solution formation supersaturated solution in the reactor, and the sodium selenate crystallization is separated out;
6. the sodium selenate that crystallization is gone out is conveyed in the whizzer, dewaters; Put into baking oven after the dehydration, under 120 ℃ of temperature, dry, dry to sodium selenate intracrystalline water content less than 0.05%, again through overcooling, pulverizing, sub-sieve, make the sodium selenate product.
Embodiment 3
A kind of preparation technique of sodium selenate comprises following technological step:
1. in steel basin, add 3000L water, add the 2250kg tin anhydride again.And begin to stir, tin anhydride is dissolved in the water fully, form selenous acid solution;
2. in this selenous acid solution, slowly add sodium hydroxide 1620kg, adjust pH value, thereby form sodium selenite solution.
3. subsequently, in sodium selenite solution, add hydrogen peroxide 2250kg, and keep 60 ℃ of design temperatures, stir 30h.Make the Sodium Selenite in the solution, be completely oxidized to and be sodium selenate;
4. in above-mentioned sodium selenate solution, add additive 1.95kg, sorbent material 1.5kg, and stirred 5 hours;
5. then, sodium selenate solution is filtered, and be transported in the reactor, heating evaporation makes sodium selenate solution formation supersaturated solution in the reactor, and the sodium selenate crystallization is separated out;
6. the sodium selenate that crystallization is gone out is conveyed in the whizzer, dewaters; Put into baking oven after the dehydration, under 200 ℃ of temperature, dry.Dry to sodium selenate intracrystalline water content less than 0.05%, cooling, pulverizing, sub-sieve are made the sodium selenate product.
Involved additive is mainly the polymeric type material among the above embodiment, and described sorbent material is mainly and absorbs the class material.The those of ordinary skill that the present technique main points can be in the present technique field is grasped, and can select according to specific circumstances.
The product of the Sodium Selenite that the present invention produces reaches following technical indicator:
Sodium selenate content: 99%
Other foreign matter content: Fe 10, Cr 5, Ni 10, Cu 10, Te 50, Pb 5, As20, Cd 1, Hg 0.1 (unit: ppm)
Particle diameter: 150 orders.
Claims (6)
1. preparation technique of sodium selenate is characterized in that comprising following technological step:
(1) in steel basin, adds 1000～3000L water, add 500～1500kg tin anhydride again, and stir.Tin anhydride is dissolved in the water fully, forms selenous acid solution;
(2) in above-mentioned selenous acid solution, slowly add sodium hydroxide 500～2000kg, adjust pH value 7～14, form sodium selenite solution;
(3) subsequently, in sodium selenite solution, add hydrogen peroxide 800～3000kg, and keep stirring 20～40h under 40～80 ℃ of the design temperatures; Make the Sodium Selenite in the solution be oxidized into sodium selenate fully;
(4) in above-mentioned sodium selenate solution, add additive 0.2～2kg, sorbent material 0.1～2kg, and stirred 1～5 hour;
(5) then, sodium selenate solution is filtered, and be transported in the reactor, heating evaporation makes sodium selenate solution formation supersaturated solution in the reactor, and the sodium selenate crystallization is separated out;
(6) sodium selenate that crystallization is gone out is conveyed into whizzer and dewaters; Put into baking oven after the dehydration and under 80～200 ℃ of temperature, dry, dry by the fire to sodium selenate intracrystalline water content and make the sodium selenate product less than 0.05% postcooling, pulverizing, sub-sieve.
2. a preparation technique of sodium selenate is characterized in that addition amount of sodium hydroxide is 800～1200kg in (2) step, adjusts PH=7-14.
3. the preparation technology of a kind of Sodium Selenite according to claim 1 is characterized in that the additive described in (3) step is the polymeric type material.
4. the preparation technology of a kind of Sodium Selenite according to claim 1 is characterized in that the sorbent material described in (3) step is for absorbing the class material.
5. the preparation technology of a kind of Sodium Selenite according to claim 1 is characterized in that adding hydrogen peroxide 800-3000kg in the sodium selenite solution described in (3) step, and keeps 40-60 ℃ of temperature, and stirred 20-40 hour.
6. the preparation technology of a kind of Sodium Selenite according to claim 1, it is characterized in that the Sodium Selenite dehydration described in (6) step after, put into baking oven and under 80～200 ℃ of temperature, dry, dry by the fire to sodium selenate intracrystalline water content less than 0.05%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710028912XA CN101112999A (en) | 2007-06-29 | 2007-06-29 | Preparation process of sodium selenate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710028912XA CN101112999A (en) | 2007-06-29 | 2007-06-29 | Preparation process of sodium selenate |
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|---|---|
| CN101112999A true CN101112999A (en) | 2008-01-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321349A (en) * | 2019-08-03 | 2021-02-05 | 乔卫林 | High-activity selenium-rich nutrient solution special for fruit trees |
-
2007
- 2007-06-29 CN CNA200710028912XA patent/CN101112999A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321349A (en) * | 2019-08-03 | 2021-02-05 | 乔卫林 | High-activity selenium-rich nutrient solution special for fruit trees |
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Open date: 20080130 |