CN100376489C - Flocculant for seawater and preparation method - Google Patents
Flocculant for seawater and preparation method Download PDFInfo
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- CN100376489C CN100376489C CNB03144380XA CN03144380A CN100376489C CN 100376489 C CN100376489 C CN 100376489C CN B03144380X A CNB03144380X A CN B03144380XA CN 03144380 A CN03144380 A CN 03144380A CN 100376489 C CN100376489 C CN 100376489C
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Abstract
The present invention relates to a seawater flocculating agent and a preparation method thereof, which belongs to the technical field of environmental engineering, and the seawater flocculating agent comprises poly silicon acid with the content of SiO2 of 20 to 40 g/l and AlCl3 with the content of 10 to 400 g/l. The preparation method of the seawater flocculating agent comprises the following steps: sodium silicate solution comprising the concentration of SiO2 of 3 to 5 wt% is added into concentrated hydrochloric acid with the concentration of 15 to 20% under the condition of a stirring process, and a standing process lasts for 4 to 20 minutes when the pH of an end point is controlled to be from 4.1 to 4.5. The seawater flocculating agent has high seawater turbidity and COD removing rate and also has the characteristics of safety, good quality, high efficiency and low price. The preparation method of the seawater flocculating agent has the advantages of simple condition, few side reaction in a poly reaction, wide synthesis raw material source, low appliance investment and easy industrialization.
Description
Technical field
The invention belongs to field of environment engineering technology, the flocculation agent that especially relates to a kind of seawater flocculation agent preparation method and make.
Background technology
Flocculation agent is one of most widely used 3 kinds of water treatment agents, is bringing into play important effect in fields such as solving shortage of water resources and water pollution control.With the water treatment is example, at first, the suspended matter of flocculation energy effective elimination 80%-95% and the colloidalmaterial of 65%-95%, the COD value plays an important role in the water to reducing; Moreover flocculation by flocculating and purifying, generally can change microorganism more than 90% and virus in the water over to mud to removing bacterium, the viral effect stability in anhydrating in the lump, and further sterilization, the sterilization for the treatment of water are become than being easier to; In addition, problems such as the body eutrophication that comes into one's own day by day, waste water decoloring adopt inorganic flocculating agent than biological process dephosphorization, good decolorizing effect.
Research to the seawater coagulation technology is not only few both at home and abroad at present, and only is in the screening stage to flocculation agent.Research and development to flocculation agent in the seawer system almost are blank, also do not have the report of studying at the flocculation agent of seawater characteristic specially so far.And the effect of using existing flocculation agent at fresh water to handle seawater is often not fully up to expectations, and the clearance of handling back turbidity of sea water and colourity is not high, and the tiny sedimentation difficulty of formed flco, even indivedual flocculation agent also can make turbidity of sea water increase.
Summary of the invention
Problem solved by the invention is, overcomes the problem that aforesaid technology exists, and the flocculation agent that a kind of seawater flocculation agent preparation method is provided and has made.
For solving general shortage of fresh water problem, the especially situation of coastland lack of water, should pay the utmost attention to sea water desaltination and direct seawater utilization, Cost of seawater desalination is high so far, makes that to carry out sea water desaltination on a large scale unrealistic.And direct seawater utilization, especially seawater have less investment as reclaimed water, save fresh water outstanding effect characteristics.So the direct utilization of seawater is a primary method of alleviating coastland water supply gets situation.And the gordian technique that direct seawater utilization will solve is the seawater cleaning technology, especially coagulation technology.
At the coagulation property and the coagulation mechanism of seawater, a series of novel inorganic polymeric hydantoin water flocculation agent have been synthesized in exploitation specially in the present invention.
The preparation method of seawater flocculation agent of the present invention adopts following technical scheme to realize:
A kind of preparation method of seawater flocculation agent, wherein: will contain SiO
2Weight percent concentration is 3～5% sodium silicate solution, joins under agitation condition in 15～20% the concentrated hydrochloric acid, and control terminal point PH=4.1～4.5 o'clock left standstill 4-20 minute, added aluminum chloride then, and stirring and dissolving, ageing make the polymeric aluminium-silica flocculation agent.
The preparation method of seawater flocculation agent of the present invention can also adopt following technical measures further to realize:
The preparation method of aforesaid seawater flocculation agent, wherein: under 25～35 ℃ of conditions,, be mixed with distilled water and contain SiO with the water glass solid
2Weight percent concentration is 3～5% sodium silicate solution, under agitation condition, join in 15～20% the concentrated hydrochloric acid, reaction times is 10-30 minute, control terminal point PH=4.1～4.5 o'clock, left standstill 4-20 minute, add aluminum chloride then, stirring and dissolving, ageing 20-40 minute make the polymeric aluminium-silica flocculation agent.
The preparation method of aforesaid seawater flocculation agent, wherein: will contain SiO
2Weight percent concentration is 3～5% sodium silicate solution, join under agitation condition in 15～20% the concentrated hydrochloric acid, left standstill 4-20 minute control terminal point PH=4.1～4.5, add aluminum chloride and iron trichloride then, stirring and dissolving, ageing make the polymeric aluminium-silica ferric flocculant.
The preparation method of aforesaid seawater flocculation agent, wherein: under 25～35 ℃ of conditions,, be mixed with distilled water and contain SiO with the water glass solid
2Weight percent concentration is 3～5% sodium silicate solution, under agitation condition, join in 15～20% the concentrated hydrochloric acid, reaction times is 10-30 minute, control terminal point PH=4.1～4.5, left standstill 4-20 minute, add earlier aluminum chloride then, add iron trichloride again, stirring and dissolving, ageing 20-40 minute make the polymeric aluminium-silica ferric flocculant.
Seawater flocculation agent of the present invention adopts following technical scheme to realize:
Seawater flocculation agent according to the preceding method preparation is inorganic flocculating agent, and wherein, flocculation agent contains: poly-silicic acid is with SiO
2Count 20～40g/L, AlCl
3Be 10～400g/L.
Seawater flocculation agent of the present invention can also adopt following technical measures further to realize:
Aforesaid seawater flocculation agent, wherein, flocculation agent contains: poly-silicic acid is with SiO
2Count 25～30g/L, AlCl
3Be 150～250g/L.
Aforesaid seawater flocculation agent, wherein, flocculation agent contains: poly-silicic acid is with SiO
2Count 20～40g/L, AlCl
3Be 10～400g/L, FeCl
3Be 10～400g/L.
Aforesaid seawater flocculation agent, wherein, flocculation agent contains: poly-silicic acid is with SiO
2Count 20～40g/L, AlCl
3Be 150～250g/L, FeCl
3Be 150～250g/L.
The present invention compared with prior art has significant advantage and beneficial effect: the seawater flco of crossing with this chemicals treatment forms that speed is fast, volume big, heavy speed is rapidly when leaving standstill; The turbidity of seawater, COD clearance height; And the using dosage of medicament is few far beyond traditional flocculant, and the flocculation agent that handling general turbidity seawater only needs to add about 5ppm usually just can reach the good treatment effect.And the synthesis technique of medicament is simple, reagent cost is suitable with traditional flocculant; Seawater after the chemicals treatment to people and animals without any injury.Therefore, use this flocculation agent to handle seawater and have safety, high-quality, efficient, cheap characteristics.
Processing condition were simple when the seawater flocculation agent was synthetic realizes that easily the side reaction of polyreaction is few, and institute's synthetic product is liquid, has characteristics easy to use.And the synthesis material wide material sources, facility investment is low, easily realizes suitability for industrialized production.
Adopt the agent of this seawater flocculation to handle high turbidity seawater, especially use compound inorganic high molecular flocculant, because the interaction of different kinds of ions component in the flocculation agent, colloidalmaterial in the seawater good neutralization, adsorption have been played, handle seawater with it, the place to go rate of turbidity of sea water is more than 80%, and the turbidity of sea water of handling is all below 10.
Embodiment
Below in conjunction with preferred embodiment,, be described in detail as follows foundation the specific embodiment of the present invention, summary of the invention, feature and effect thereof:
Embodiment 1
A kind of preparation method of seawater flocculation agent is under 30 ℃ of conditions, with the water glass solid, is mixed with distilled water and contains SiO
2Weight percent concentration is 4% sodium silicate solution, joins under agitation condition in 16% the concentrated hydrochloric acid, and the reaction times is 25 minutes, during control terminal point PH=4.2, left standstill 15 minutes, and added aluminum chloride then, stirring and dissolving, ageing made the polymeric aluminium-silica flocculation agent in 30 minutes.
Embodiment 2
The preparation method of seawater flocculation agent is under 30 ℃ of conditions, with the water glass solid, is mixed with distilled water and contains SiO
2Weight percent concentration is 4% sodium silicate solution, under agitation condition, join in 16% the concentrated hydrochloric acid, reaction times is 25 minutes, during control terminal point PH=4.2, left standstill 15 minutes, add aluminum chloride then earlier, add iron trichloride again, stirring and dissolving, ageing made the polymeric aluminium-silica flocculation agent in 30 minutes.
Embodiment 3
The highly effective sea-water flocculation agent of embodiment 1 preparation, its flocculant solution contains following component: poly-silicic acid is (with SiO
2Meter) be 28g/L; AlCl
3Be 200g/L.
Embodiment 4
The highly effective sea-water flocculation agent of embodiment 2 preparations, its flocculant solution contains following component: poly-silicic acid is (with SiO
2Meter) be 28g/L; AlCl
3Be 200g/L; FeCl
3Be 200g/L.
Claims (8)
1. the preparation method of a seawater flocculation agent is characterized in that: will contain SiO
2Weight percent concentration is 3～5% sodium silicate solution, joins under agitation condition in 15～20% the concentrated hydrochloric acid, and control terminal point PH=4.1～4.5 o'clock left standstill 4-20 minute, added aluminum chloride then, and stirring and dissolving, ageing make the polymeric aluminium-silica flocculation agent.
2. the preparation method of seawater flocculation agent according to claim 1 is characterized in that: under 25～35 ℃ of conditions, with the water glass solid, be mixed with distilled water and contain SiO
2Weight percent concentration is 3～5% sodium silicate solution, under agitation condition, join in 15～20% the concentrated hydrochloric acid, reaction times is 10-30 minute, control terminal point PH=4.1～4.5 o'clock, left standstill 4-20 minute, add aluminum chloride then, stirring and dissolving, ageing 20-40 minute make the polymeric aluminium-silica flocculation agent.
3. the preparation method of seawater flocculation agent according to claim 1 is characterized in that: will contain SiO
2Weight percent concentration is 3～5% sodium silicate solution, join under agitation condition in 15～20% the concentrated hydrochloric acid, left standstill 4-20 minute control terminal point PH=4.1～4.5, add aluminum chloride and iron trichloride then, stirring and dissolving, ageing make the polymeric aluminium-silica ferric flocculant.
4. the preparation method of seawater flocculation agent according to claim 3 is characterized in that: under 25～35 ℃ of conditions, with the water glass solid, be mixed with distilled water and contain SiO
2Weight percent concentration is 3～5% sodium silicate solution, under agitation condition, join in 15～20% the concentrated hydrochloric acid, reaction times is 10-30 minute, control terminal point PH=4.1～4.5, left standstill 4-20 minute, add earlier aluminum chloride then, add iron trichloride again, stirring and dissolving, ageing 20-40 minute make the polymeric aluminium-silica ferric flocculant.
5. according to the seawater flocculation agent of claim 1 preparation, be inorganic flocculating agent, it is characterized in that flocculation agent contains: poly-silicic acid is with SiO
2Count 20～40g/L, AlCl
3Be 10～400g/L.
6. seawater flocculation agent according to claim 5 is characterized in that flocculation agent contains: poly-silicic acid is with SiO
2Count 25～30g/L, AlCl
3Be 150～250g/L.
7. according to the seawater flocculation agent of claim 3 preparation, it is characterized in that flocculation agent contains: poly-silicic acid is with SiO
2Count 20～40g/L, AlCl
3Be 10～400g/L, FeCl
3Be 10～400g/L.
8. seawater flocculation agent according to claim 7 is characterized in that flocculation agent contains: poly-silicic acid is with SiO
2Count 20～40g/L, AlCl
3Be 150～250g/L, FeCl
3Be 150～250g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB03144380XA CN100376489C (en) | 2003-09-26 | 2003-09-26 | Flocculant for seawater and preparation method |
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| CNB03144380XA CN100376489C (en) | 2003-09-26 | 2003-09-26 | Flocculant for seawater and preparation method |
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| CN1600702A CN1600702A (en) | 2005-03-30 |
| CN100376489C true CN100376489C (en) | 2008-03-26 |
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| CNB03144380XA Expired - Fee Related CN100376489C (en) | 2003-09-26 | 2003-09-26 | Flocculant for seawater and preparation method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2930541B1 (en) * | 2008-04-29 | 2010-05-21 | Solvay | PROCESS FOR PURIFYING AQUEOUS SOLUTIONS |
| CN101838040A (en) * | 2010-04-13 | 2010-09-22 | 国家海洋局天津海水淡化与综合利用研究所 | Method for purifying seawater by taking carboxymethyl chitosan as flocculant |
| CN103043764A (en) * | 2013-01-06 | 2013-04-17 | 国家海洋局天津海水淡化与综合利用研究所 | Preparation method of composite seawater flocculating agent |
| CN103043763A (en) * | 2013-01-06 | 2013-04-17 | 国家海洋局天津海水淡化与综合利用研究所 | Preparation method of multi-effect seawater flocculating agent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4981675A (en) * | 1988-11-03 | 1991-01-01 | Handy Chemicals Ltd. | Polymeric basic aluminum silicate-sulphate |
| EP0551061A1 (en) * | 1991-12-12 | 1993-07-14 | Kemira Kemi Aktiebolag | Process for the preparation of a coagulating chemical |
| US5296213A (en) * | 1992-08-13 | 1994-03-22 | Handy Chemicals Limited | Polymeric aluminum silicate-sulphate and process for producing same |
| CN1400172A (en) * | 2001-07-31 | 2003-03-05 | 中国石油化工股份有限公司 | Preparation method of polysilicon-aluminium flocculant |
-
2003
- 2003-09-26 CN CNB03144380XA patent/CN100376489C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4981675A (en) * | 1988-11-03 | 1991-01-01 | Handy Chemicals Ltd. | Polymeric basic aluminum silicate-sulphate |
| EP0551061A1 (en) * | 1991-12-12 | 1993-07-14 | Kemira Kemi Aktiebolag | Process for the preparation of a coagulating chemical |
| US5296213A (en) * | 1992-08-13 | 1994-03-22 | Handy Chemicals Limited | Polymeric aluminum silicate-sulphate and process for producing same |
| CN1400172A (en) * | 2001-07-31 | 2003-03-05 | 中国石油化工股份有限公司 | Preparation method of polysilicon-aluminium flocculant |
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Granted publication date: 20080326 Termination date: 20110926 |