CN103387239B - Novel silica gel washing method - Google Patents
Novel silica gel washing method Download PDFInfo
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- CN103387239B CN103387239B CN201310324549.1A CN201310324549A CN103387239B CN 103387239 B CN103387239 B CN 103387239B CN 201310324549 A CN201310324549 A CN 201310324549A CN 103387239 B CN103387239 B CN 103387239B
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Abstract
The invention discloses a novel silica gel washing method. The novel silica gel washing method comprises the following steps: preparing and ageing silica gel; tapping and washing the aged silica gel with seawater instead of tap water; washing the silica gel with tap water; drying the washed silica gel to prepare the silica gel. The gel is washed with seawater, so the limited freshwater resources are saved; the pH value of the seawater is 7.9 to 8.3, so the washing speed is increased by the ionized OH<->; the OH<-> has a chambering effect on the silica gel and gross-porosity silica gel with the pore volume requirement being more than 0.76 ml/g does not need to be subjected to ammonia soaking, so that the production efficiency of the silica gel is greatly improved and the production cost is reduced. The silica gel prepared by the silica gel washing method has the characteristic of high adsorbability. The novel silica gel washing method has a good economic benefit and a certain social benefit.
Description
Technical field
The invention belongs to inorganic silica gel production technique field, be specifically related to a kind of novel silica gel method for washing.
Background technology
The technical process mostly adopting in inorganic silica gel production field is at present certain density sulfuric acid and water glass glue, aging, rubber tapping, washing, ammonia bubble, the operation such as dry, owing to generating sodium sulfate in glue process, and excessive acid, has just completed aging silica gel for acid.Follow-up rubber tapping, washing two procedures main purpose are to remove sodium sulfate with a large amount of washings, and the pH value of glue is washed till within the scope of the terminal of processing requirement, then make silica gel through operations such as ammonia steep, is dried.1 ton of silica gel of every production need expend 20-30 ton water according to statistics.
China is the country of a drought and water shortage, and the water yield is only 2200 cubic metres per capita, is only 1/4 of world average level, ranks 121 in the world, is one of 13 countries that water resources is the poorest per capita in the whole world.The contradiction that the shortage of water resources and inorganic silica gel expend between large water gaging in producing highlights day by day, is therefore badly in need of solving this technical problem.
Summary of the invention
For tapping rubber in inorganic silica gel production process, washing, glue water requirement is larger, and the contradiction of tap water resource between relatively less, the invention provides a kind of novel silica gel method for washing, the technological improvement that in producing mainly for inorganic silica gel, washing process carries out, the present invention specifically uses seawater to replace part of running water to tap rubber, wash, and finally with less tap water, washes laggard row oven dry and makes silica gel.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A kind of novel silica gel method for washing, silica gel through glue, aging after, discharge aging water, add the seawater of pH value 7.9-8.3 to tap rubber, tap rubber complete until seawater liquid level during higher than glue face 30-50cm, stop adding seawater and carry out seawater and wash glue, controlling seawater, to wash the temperature of glue be 40-90 ℃, and seawater is washed glue, and to be washed till endpoint pH be 3.0-6.0; Then change tap water washing, the water temperature of tap water washing is controlled at 40-85 ℃, and tap water is washed till terminal pH >=5.0, and then drying makes thick-hole block silica gel.
Further, to wash glue preferred range be 50-60 ℃ to described seawater.
Further, to wash the preferred pH value of glue scope be 4.0-5.0 to described seawater.
Further, described tap water washing preferred range is 55-65 ℃.
Further, described tap water washing preferable range is pH >=5.8.
Further, the pore volume of described thick-hole block silica gel is more than 0.76ml/g.
Compared with prior art, advantage of the present invention and technique effect are: due to the weakly alkaline of seawater self and the singularity of moiety, OH-in seawater enters in pore has melting to silicon-dioxide, so seawater has certain reaming effect to silica gel, to pore volume, require the silochrom more than 0.76ml/g directly to dry and make after seawater washing, washing from the beginning, can remove ammonia bubble operation from.Because the weakly alkaline of seawater has also shortened with seawater, wash the time that glue reaches endpoint pH, the whole silica gel Production Flow Chart time is shortened.Seawater is washed glue and has not only been improved washing speed, and has saved ammonia bubble operation, and this not only increases substantially silica gel production efficiency, and has reduced production cost.
Compare with existing inorganic silica gel production technique, advantage of the present invention and technique effect are: seawater rubber tapping of the present invention replaces part of running water washing process principal feature to be: (1) has saved limited Freshwater resources, is conducive to social Sustainable development and the protection of ecotope; (2) shortened and washed the time that reaches pH value terminal, improved the production efficiency of silica gel; (3) to pore volume index request, the thick-hole block silica gel more than 0.76ml/g has been removed ammonia bubble operation from, thereby has improved production efficiency, reduced cost.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
Sulfuric acid, flower bulb alkali, by the rear glue, aging of concrete technology requirement concentration preparation, after aging end, are put into the aging water in ageing tank to specify storage place, then seawater is put into ageing tank and tap rubber.Tap rubber and completely until the seawater water surface, close seawater valve during higher than glue face 30cm, add 45 ℃ of thermal control seawater water temperatures and carry out seawater and wash glue, adopt each water washing tank list to wash, go here and there and wash the water-washing method of combination, be washed till blob of viscose pH value and reach at 3.2 o'clock and bleed off seawater; Add tap water to carry out tap water washing, 45 ℃ of temperature controls, stop washing while being washed till in glue pH value 5.8, dry and make thick-hole block silica gel.
Embodiment 2
Glue, aging after sulfuric acid, flower bulb alkali are prepared by processing requirement concentration, after aging end, bleed off aging water, put into seawater rubber tapping, the complete seawater valve of closing during higher than glue face 30cm until the seawater water surface of tapping rubber, controls 45 ℃ of seawater water temperatures and carries out seawater and wash glue, and blob of viscose pH value reaches at 4.0 o'clock and bleeds off seawater, add tap water, 65 ℃ of temperature controls, stop washing while being washed till in glue pH value 6.0, dry and make silica gel.
Embodiment 3
Glue, aging after sulfuric acid, flower bulb alkali are prepared by processing requirement concentration, after aging end, bleed off aging water, put into seawater rubber tapping, the complete seawater valve of closing during higher than glue face 30cm until the seawater water surface of tapping rubber, controls 65 ℃ of seawater water temperatures and carries out seawater and wash glue, and blob of viscose pH value reaches at 4.5 o'clock and bleeds off seawater, add tap water, 55 ℃ of temperature controls, stop washing while being washed till in glue pH value 6.0, dry and make silica gel.
Embodiment 4
Glue, aging after sulfuric acid, flower bulb alkali are prepared by processing requirement concentration, after aging end, bleed off aging water, put into seawater rubber tapping, the complete seawater valve of closing during higher than glue face 40cm until the seawater water surface of tapping rubber, controls 75 ℃ of seawater water temperatures and carries out seawater and wash glue, and blob of viscose pH value reaches at 4.2 o'clock and bleeds off seawater, add tap water, 65 ℃ of temperature controls, stop washing while being washed till in glue pH value 6.0, dry and make silica gel.
Embodiment 5
Glue, aging after sulfuric acid, flower bulb alkali are prepared by processing requirement concentration, after aging end, bleed off aging water, put into seawater rubber tapping, the complete seawater valve of closing during higher than glue face 40cm until the seawater water surface of tapping rubber, controls 55 ℃ of seawater water temperatures and carries out seawater and wash glue, and blob of viscose pH value reaches at 3.0 o'clock and bleeds off seawater, add tap water, 65 ℃ of temperature controls, stop washing while being washed till in glue pH value 6.0, dry and make silica gel.
Hole index is as shown in the table after testing for the silica gel making:
In showing above, index can be found out, silica gel is washed, washed from the beginning in the situation without ammonia bubble operation through seawater, and after drying, pore volume is all greater than 0.76ml/g, has reached the requirement of silochrom.Compare with traditional technology and saved ammonia bubble operation, in addition because the weakly alkaline of seawater has also shortened the time that washing reaches endpoint pH.So seawater is washed glue, not only improve production efficiency, and reduced production cost.
Above embodiment is only in order to technical scheme of the present invention to be described, but not is limited; The technical scheme that those of ordinary skills record previous embodiment is modified or part technical characterictic is wherein equal to replacement, and these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of the present invention's technical scheme required for protection.
Claims (6)
1. a silica gel method for washing, it is characterized in that: silica gel through glue, aging after, discharge aging water, add the seawater of pH value 7.9-8.3 to tap rubber, tap rubber complete until seawater liquid level during higher than glue face 30-50cm, stop adding seawater and carry out seawater and wash glue, controlling seawater, to wash the temperature of glue be 40-90 ℃, and seawater is washed glue, and to be washed till endpoint pH be 3.0-6.0; Then change tap water washing, the water temperature of tap water washing is controlled at 40-85 ℃, and tap water is washed till terminal pH >=5.0, and then drying makes thick-hole block silica gel.
2. a kind of silica gel method for washing according to claim 1, is characterized in that: it is 50-60 ℃ that described seawater is washed glue preferred range.
3. a kind of silica gel method for washing according to claim 1 and 2, is characterized in that: it is 4.0-5.0 that described seawater is washed the preferred pH value of glue scope.
4. a kind of silica gel method for washing according to claim 1, is characterized in that: described tap water washing preferred range is 55-65 ℃.
5. according to a kind of silica gel method for washing described in claim 1 or 4, it is characterized in that: described tap water washing preferable range is pH >=5.8.
6. a kind of silica gel method for washing according to claim 1, is characterized in that: the pore volume of described thick-hole block silica gel is more than 0.76ml/g.
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| CN201310324549.1A CN103387239B (en) | 2013-07-30 | 2013-07-30 | Novel silica gel washing method |
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| CN201310324549.1A CN103387239B (en) | 2013-07-30 | 2013-07-30 | Novel silica gel washing method |
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| CN103387239B true CN103387239B (en) | 2014-12-17 |
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| CN109292784B (en) * | 2018-10-25 | 2021-10-01 | 青岛美高集团有限公司 | Preparation method of silica gel and silica gel obtained by preparation method |
Citations (4)
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|---|---|---|---|---|
| US3178388A (en) * | 1961-10-03 | 1965-04-13 | Burke | Silica fillers reacted with sea water and uses thereof |
| CN1112519A (en) * | 1994-05-27 | 1995-11-29 | 梁儒诚 | Process for white fume |
| CN101795965A (en) * | 2007-06-27 | 2010-08-04 | J.M.休伯有限公司 | Composite caustic silica gel manufacturing method and gels made thereby |
| CN102923720A (en) * | 2012-11-20 | 2013-02-13 | 安徽科技学院 | Method for preparing nanometer white carbon black through comprehensively utilizing sodium chloride wastewater |
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2013
- 2013-07-30 CN CN201310324549.1A patent/CN103387239B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3178388A (en) * | 1961-10-03 | 1965-04-13 | Burke | Silica fillers reacted with sea water and uses thereof |
| CN1112519A (en) * | 1994-05-27 | 1995-11-29 | 梁儒诚 | Process for white fume |
| CN101795965A (en) * | 2007-06-27 | 2010-08-04 | J.M.休伯有限公司 | Composite caustic silica gel manufacturing method and gels made thereby |
| CN102923720A (en) * | 2012-11-20 | 2013-02-13 | 安徽科技学院 | Method for preparing nanometer white carbon black through comprehensively utilizing sodium chloride wastewater |
Non-Patent Citations (2)
| Title |
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| 大孔容高比表面积硅胶的制备;赵希鹏;《万方学位论文》;20121130;全文 * |
| 硅胶的制备及应用现状;赵希鹏;《广州化工》;20111231;第39卷(第24期);全文 * |
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