CN101386435A - Poly ferrosilicium coagulant and preparation method thereof - Google Patents
Poly ferrosilicium coagulant and preparation method thereof Download PDFInfo
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- CN101386435A CN101386435A CNA2008101374389A CN200810137438A CN101386435A CN 101386435 A CN101386435 A CN 101386435A CN A2008101374389 A CNA2008101374389 A CN A2008101374389A CN 200810137438 A CN200810137438 A CN 200810137438A CN 101386435 A CN101386435 A CN 101386435A
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- ferrosilicium
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- coagulant
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- 239000000701 coagulant Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 45
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 23
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 23
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 23
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 23
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 23
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims description 52
- 235000019353 potassium silicate Nutrition 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 28
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 6
- 229960001866 silicon dioxide Drugs 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 25
- 238000000034 method Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 abstract description 7
- 229920000592 inorganic polymer Polymers 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 abstract 6
- 229920005591 polysilicon Polymers 0.000 abstract 6
- XSFJVAJPIHIPKU-XWCQMRHXSA-N flunisolide Chemical compound C1([C@@H](F)C2)=CC(=O)C=C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2C[C@H]3OC(C)(C)O[C@@]3(C(=O)CO)[C@@]2(C)C[C@@H]1O XSFJVAJPIHIPKU-XWCQMRHXSA-N 0.000 abstract 3
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 16
- 239000010865 sewage Substances 0.000 description 9
- 229960004029 silicic acid Drugs 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000015271 coagulation Effects 0.000 description 5
- 238000005345 coagulation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005189 flocculation Methods 0.000 description 5
- 230000016615 flocculation Effects 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000013066 combination product Substances 0.000 description 2
- 229940127555 combination product Drugs 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- -1 iron ion Chemical class 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 159000000013 aluminium salts Chemical class 0.000 description 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- APULOIOLPWBKLS-UHFFFAOYSA-L iron(2+) silicic acid sulfate Chemical compound S(=O)(=O)([O-])[O-].[Fe+2].[Si](O)(O)(O)O APULOIOLPWBKLS-UHFFFAOYSA-L 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a poly silicon iron coagulating agent and a preparation method thereof, relates to an inorganic polymer coagulating agent and a preparation method thereof and solves the disadvantages of poor adaptability to low temperature and low turbidity water quality, high production cost, complex preparation technique and secondary pollution to the environment in the existing preparation process of poly silicon iron coagulating agent. The poly silicon iron coagulating agent of the invention is made from soluble glass, soluzione leggermente acida, ferrous sulfate and sodium chlorate. The preparation method of the poly silicon iron is as follows: step 1. raw materials are weighted; step 2. the soluble glass is added into the soluzione leggermente acida and activated silicic acid is prepared after the reaction; 3. the ferrous sulfate and the sodium chlorate are added into the rest soluzione leggermente acida and then the activated silicic acid obtained in step 2 is added, thus obtaining the poly silicon iron coagulating agent. The poly silicon iron coagulating agent is applicable to low temperature and low turbidity water quality and has the advantages of low preparation cost, simple preparation method and no pollution during the preparation process.
Description
Technical field
The present invention relates to a kind of inorganic polymer coagulant and preparation method thereof.
Background technology
Chemical coagulation is as one of the significant element of water treatment operation, and generally the flco that is formed by coagulation can reach the purpose with water sepn through technology such as precipitation, filtration or air supporting.As unit operation, the usefulness of coagulation operation not only can be subjected to the influence of pre-treatment, also can produce great effect to subsequent disposal.Coagulation technology is to be used at present increasing water quality a kind of not only economy but also easy water technology of processing efficiency both at home and abroad, and one of key issue of coagulation technology is exactly the selection of coagulating agent.And wherein inorganic polymer coagulant has just presented remarkable advantages from the sixties since the exploitation.Relatively usefulness is more excellent for it and traditional flocculation agent, and more cheap than organic polymer coargulator, and be widely used in feeding water, the various flow processs of trade effluent and municipal effluent, become the main flow flocculation agent gradually.
Polysilicate is a class novel inorganic polymeric flocculant, be to be the combination product that grows up on the basis of flocculation agents such as activated silicic acid and traditional aluminium salt, molysite at poly-silicic acid, be used as the coupling metal ion by iron ion and aluminum ion, the coupling metal ion can be adjusted with different service requirementss with the mol ratio of silicic acid.The original intention that develops this series products is that the charge neutrality ability of metal ion and the adsorption bridging ability of poly-silicic acid combine, thereby makes combination product have stronger charge neutrality adsorption bridging effect, reaches better purifying water effect.Stability is taken off in their flocculation can be considerably beyond poly-silicic acid and poly-metal ion, compare with poly-silicic acid, not only improve stability, and increased the charge neutrality ability, compared, can increase and cohere the bridge formation performance with poly-metal ion, and be easy to preparation, price is suitable, has caused the very big concern of field of water treatment, has become a focus of domestic and international inorganic polymer flocculant research.But many studies show that, the aluminium that enters human body through various channels can produce accumulation and can participate in intravital multiple biochemical reaction, thereby the physiological function that causes producing bio-toxicity and destroy each organ, so poly-ferrosilicon salt has also just received increasing concern.
The development of ferric-polysilicate salt starts from the phase at the beginning of the nineties in last century, it is fast to have coagulative precipitation, sludge quantity is few, the wide in range pH value scope of application, advantages such as safety non-toxic, main preparation method mainly contains following two kinds at present: patent name is " poly ferric silicon type compound inorganic high molecular flocculant and preparation method thereof ", publication number is that the Chinese patent of CN1210818 is with liquid ferrous trichloride, sodium bicarbonate and service water glass are raw material, with the oligomeric silicic acid is stablizer, adopt the homopolymerization composite algorithm to prepare polymerization iron-polymeric silicicacid flocculation agent, and be to use same preparation method to prepare different ferrosilicon mol ratio coagulating agent, to adapt to the former water and the waste water of different quality.Patent name is that " solid ferric silicosulfate polymer and production method ", publication number are that the Chinese patent of CN1389407 adopts the nitric acid oxidation ferrous sulfate and is raw material production solid polymerization silicic acid iron sulfate with the water glass, the reaction steam heating, temperature is controlled at 80 ℃～90 ℃, and adopts the tail gas absorption system to handle the waste gas of problem of secondary pollution.More than the coagulating agent produced of two kinds of methods exist in low-temperature and low turbidity water quality bad adaptability, production cost height, complicated process of preparation and the production process environment being produced the defective of secondary pollution.
Summary of the invention
The present invention exists in the poly-iron silicon coagulating agent of existing preparation in low-temperature and low turbidity water quality bad adaptability, production cost height, complicated process of preparation and the production process environment being produced the defective of secondary pollution in order to solve, and a kind of poly ferrosilicium coagulant and preparation method thereof is provided.
Poly ferrosilicium coagulant of the present invention is made by 20%～60% water glass, 10%～30% dilute acid soln, 10%～50% ferrous sulfate and 1.5%～10% sodium chlorate by weight percentage; Wherein the solute of dilute acid soln is sulfuric acid, hydrochloric acid, phosphoric acid or acetate, and the concentration of dilute acid soln is 20%～50%.
The preparation method of poly ferrosilicium coagulant of the present invention carries out according to following steps: one, take by weighing 20%～60% water glass, 10%～30% dilute acid soln, 10%～50% ferrous sulfate and 1.5%～10% sodium chlorate by weight percentage respectively; Two, under the stirring velocity of 400～600r/min water glass is joined in the dilute acid soln of a part, the pH value that makes mixing solutions is 2.0～3.5, and stopping stirring and control reaction temperature then is 20 ℃～60 ℃, behind reaction 1～10h, makes activated silicic acid; Three, be under the condition of 200～400r/min at 20 ℃～80 ℃, stirring velocity, ferrous sulfate and sodium chlorate are joined in the remaining dilute acid soln, add the activated silicic acid that step 2 makes behind 10～30min again, speed with 100～200r/min stirs 30～60min then, leaves standstill 1～24h again; Promptly obtain poly ferrosilicium coagulant; The solute of the dilute acid soln in the step 1 is sulfuric acid, hydrochloric acid, phosphoric acid or acetate, and the concentration of dilute acid soln is 20%～50%.
Poly ferrosilicium coagulant of the present invention has the following advantages: 1, low-temperature and low turbidity water quality adaptability is obviously strengthened, can effectively reduce turbidity, natural organic matter (UV
254) and chemical oxygen demand (COD) (COD); 2, product safety is nontoxic; 3, be widely used, be applicable to a plurality of fields such as city water and sewage, industrial water supply, wastewater treatment and sludge dewatering.
The preparation method of poly ferrosilicium coagulant of the present invention has the following advantages: 1, method is simple, can prepare at normal temperatures, need not heating, and the shortest production time only is 2 hours 40 minutes; 2, raw material is easy to get, and the preparation method before having changed does not use the acetate preparation; 3, preparation cost is low, and cost has reduced by 2%～10% than the preparation method of existing coagulating agent; 4, do not produce waste gas in the preparation process, product is environmentally friendly.
Description of drawings
Fig. 1 is the poly ferrosilicium coagulant of embodiment 29 preparations and the comparison diagram of the reduction sewage turbidity of existing polymerize aluminum chloride coagulating agent when dosage is 0.06mmol/L, wherein " ▲ " reduces sewage turbidity curve for poly ferrosilicium coagulant, and " ◆ " reduces sewage turbidity curve for the polymerize aluminum chloride coagulating agent; Fig. 2 is the poly ferrosilicium coagulant of embodiment 29 preparations and the comparison diagram of the reduction sewage turbidity of existing polymerize aluminum chloride coagulating agent when dosage is 0.18mmol/L, wherein " * " reduces sewage turbidity curve for poly ferrosilicium coagulant, and " ■ " reduces sewage turbidity curve for the polymerize aluminum chloride coagulating agent.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the poly ferrosilicium coagulant of present embodiment is made by 20%～60% water glass, 10%～30% dilute acid soln, 10%～50% ferrous sulfate and 1.5%～10% sodium chlorate by weight percentage; Wherein the solute of dilute acid soln is sulfuric acid, hydrochloric acid, phosphoric acid or acetate, and the concentration of dilute acid soln is 20%～50%.
Embodiment two: the difference of present embodiment and embodiment one is: poly ferrosilicium coagulant is made by 30%～50% water glass, 15%～25% dilute acid soln, 20%～40% ferrous sulfate and 3%～8.5% sodium chlorate by weight percentage; The concentration of dilute acid soln is 30%～40%.Other is identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one is: poly ferrosilicium coagulant is made by 40% water glass, 20% dilute acid soln, 30% ferrous sulfate and 10% sodium chlorate by weight percentage; The concentration of dilute acid soln is 35%.Other is identical with embodiment one.
Embodiment four: present embodiment and embodiment one, two or threes' difference is: the mass concentration of silicon-dioxide is 2%～8% in the water glass.Other is identical with embodiment one, two or three.
Embodiment five: the preparation method of the poly ferrosilicium coagulant of present embodiment carries out according to following steps: one, take by weighing 20%～60% water glass, 10%～30% dilute acid soln, 10%～50% ferrous sulfate and 1.5%～10% sodium chlorate by weight percentage respectively; Two, under the stirring velocity of 400～600r/min water glass is joined in the dilute acid soln of a part, the pH value that makes mixing solutions is 2.0～3.5, and stopping stirring and control reaction temperature then is 20 ℃～60 ℃, behind reaction 1～10h, makes activated silicic acid; Three, be under the condition of 200～400r/min at 20 ℃～80 ℃, stirring velocity, ferrous sulfate and sodium chlorate are joined in the remaining dilute acid soln, add the activated silicic acid that step 2 makes behind 10～30min again, speed with 100～200r/min stirs 30～60min then, leaves standstill 2～24h again; Promptly obtain poly ferrosilicium coagulant; The solute of the dilute acid soln in the step 1 is sulfuric acid, hydrochloric acid, phosphoric acid or acetate, and the concentration of dilute acid soln is 20%～50%.
Embodiment six: the difference of present embodiment and embodiment five is: take by weighing 30%～50% water glass, 15%～25% dilute acid soln, 20%～40% ferrous sulfate and 3%～8.5% sodium chlorate in the step 1 by weight percentage respectively.Other step and parameter are identical with embodiment five.
Embodiment seven: the difference of present embodiment and embodiment five is: take by weighing 40% water glass, 20% dilute acid soln, 30% ferrous sulfate and 10% sodium chlorate in the step 1 by weight percentage respectively.Other step and parameter are identical with embodiment five.
Embodiment eight: present embodiment and embodiment five, six or sevens' difference is: the mass concentration of silicon-dioxide is 2%～8% in the step 1 water glass.Other step and parameter are identical with embodiment five, six or seven.
Embodiment nine: the difference of present embodiment and embodiment five is: under the stirring velocity of 450～550r/min water glass is joined in the dilute acid soln in the step 2.Other step and parameter are identical with embodiment five.
Embodiment ten: the difference of present embodiment and embodiment five is: under the stirring velocity of 500r/min water glass is joined in the dilute acid soln in the step 2.Other step and parameter are identical with embodiment five.
Embodiment 11: the difference of present embodiment and embodiment five is: in the step 2 water glass being joined the pH value that makes mixing solutions in the dilute acid soln is 2.3～3.2.Other step and parameter are identical with embodiment five.
Embodiment 12: the difference of present embodiment and embodiment five is: in the step 2 water glass being joined the pH value that makes mixing solutions in the dilute acid soln is 2.8.Other step and parameter are identical with embodiment five.
Embodiment 13: the difference of present embodiment and embodiment five is: control reaction temperature is 30 ℃～50 ℃ in the step 2.Other step and parameter are identical with embodiment five.
Embodiment 14: the difference of present embodiment and embodiment five is: control reaction temperature is 40 ℃ in the step 2.Other step and parameter are identical with embodiment five.
Embodiment 15: the difference of present embodiment and embodiment five is: the reaction times is 3～8h in the step 2.Other step and parameter are identical with embodiment five.
Embodiment 16: the difference of present embodiment and embodiment five is: the reaction times is 5h in the step 2.Other step and parameter are identical with embodiment five.
Embodiment 17: the difference of present embodiment and embodiment five is: be under the condition of 250～350r/min at 40 ℃～60 ℃, stirring velocity in the step 3, ferrous sulfate and sodium chlorate are joined in the dilute acid soln.Other step and parameter are identical with embodiment five.
Embodiment 18: the difference of present embodiment and embodiment five is: be under the condition of 300r/min at 50 ℃, stirring velocity in the step 3, ferrous sulfate and sodium chlorate are joined in the dilute acid soln.Other step and parameter are identical with embodiment five.
Embodiment 19: the difference of present embodiment and embodiment five is: add the activated silicic acid that step 2 makes in the step 3 behind 15～25min again.Other step and parameter are identical with embodiment five.
Embodiment 20: the difference of present embodiment and embodiment five is: add the activated silicic acid that step 2 makes in the step 3 behind the 20min again.Other step and parameter are identical with embodiment five.
Embodiment 21: the difference of present embodiment and embodiment five is: add in the step 3 that the speed with 120～180r/min stirs 40～50min behind the activated silicic acid.Other step and parameter are identical with embodiment five.
Embodiment 22: the difference of present embodiment and embodiment five is: add in the step 3 that the speed with 150r/min stirs 45min behind the activated silicic acid.Other step and parameter are identical with embodiment five.
Embodiment 23: the difference of present embodiment and embodiment five is: leave standstill 6～20h after stirring in the step 3.Other step and parameter are identical with embodiment five.
Embodiment 24: the difference of present embodiment and embodiment five is: leave standstill 10～16h after stirring in the step 3.Other step and parameter are identical with embodiment five.
Embodiment 25: the difference of present embodiment and embodiment five is: leave standstill 13h after stirring in the step 3.Other step and parameter are identical with embodiment five.
Embodiment 26: the difference of present embodiment and embodiment five is: the solute of the dilute acid soln in the step 1 is a sulfuric acid, and the concentration of dilute acid soln is 30%～40%.Other step and parameter are identical with embodiment five.
Poly ferrosilicium coagulant with the preparation of ability embodiment method is handled the preserved egg river, and injected volume is 0.21mmol/L, and behind the input 40min, the turbidity of measuring water is 0.67, COD
MnClearance be 60.4%, UV
254Clearance be 85.4%.Do not need in the treating processes water is heated up.
The water temperature of the preserved egg river before handling is 15 ℃, and the pH value is 7.34, and turbidity is 13.52NTU, COD
MnValue is 7.18mg/L, UV
254Value is 0.145mg/L.
Embodiment 27: the difference of present embodiment and embodiment five is: the solute of the dilute acid soln in the step 1 in the step 1 is a hydrochloric acid, and the concentration of dilute acid soln is 25%～45%.Other step and parameter are identical with embodiment five.
Poly ferrosilicium coagulant with the preparation of ability embodiment method is handled the preserved egg river, and injected volume is 0.21mmol/L, and behind the input 40min, the turbidity of measuring water is 0.65, COD
MnClearance be 65.8%, UV
254Clearance be 85.6%.Do not need in the treating processes water is heated up.
The water temperature of the preserved egg river before handling is 15 ℃, and the pH value is 7.34, and turbidity is 13.52NTU, COD
MnValue is 7.18mg/L, UV
254Value is 0.145mg/L.
Embodiment 28: the difference of present embodiment and embodiment five is: the solute of the dilute acid soln in the step 1 in the step 1 is an acetate, and the concentration of dilute acid soln is 35%.Other step and parameter are identical with embodiment five.
Poly ferrosilicium coagulant with the preparation of ability embodiment method is handled the preserved egg river, and injected volume is 0.21mmol/L, and behind the input 40min, the turbidity of measuring water is 0.35, COD
MnClearance be 74.3%, UV
254Clearance be 92.1%.Do not need in the treating processes water is heated up.
The water temperature of the preserved egg river before handling is 15 ℃, and the pH value is 7.34, and turbidity is 13.52NTU, COD
MnValue is 7.18mg/L, UV
254Value is 0.145mg/L.
Embodiment 29: the preparation method of present embodiment poly ferrosilicium coagulant carries out according to following steps: one, take by weighing 50% water glass, 15% dilute acid soln, 30% ferrous sulfate and 5% sodium chlorate by weight percentage respectively; Two, under the stirring velocity of 500r/min water glass is joined in the dilute acid soln of a part, the pH value that makes mixing solutions is 3.0, and stopping stirring and control reaction temperature then is 40 ℃, behind the reaction 4h, makes activated silicic acid; Three, be under the condition of 300r/min at 50 ℃, stirring velocity, ferrous sulfate and sodium chlorate joined in the remaining dilute acid soln that add the activated silicic acid that step 2 makes behind the 20min again, the speed with 150r/min stirs 40min then, leaves standstill 4h again; Promptly obtain poly ferrosilicium coagulant; The solute of the dilute acid soln in the step 1 is an acetate, and the concentration of dilute acid soln is 35%.
The mass concentration of silicon-dioxide is 8% in the present embodiment step 1 water glass.
(water temperature of preserved egg river is 15 ℃, and the pH value is 7.34, and turbidity is 13.52NTU, COD to handle the preserved egg river with the poly ferrosilicium coagulant of present embodiment preparation and existing polymerize aluminum chloride coagulating agent
MnValue is 7.18mg/L, UV
254Value is for 0.145mg/L), injected volume is 0.06mmol/L, the correlation curve after the processing as shown in Figure 1, as can be seen from Figure 1 the poly ferrosilicium coagulant of the present embodiment preparation ability of disposing of sewage after 30 minutes significantly better than existing polymerize aluminum chloride coagulating agent.
(water temperature of preserved egg river is 15 ℃, and the pH value is 7.34, and turbidity is 13.52NTU, COD to handle the preserved egg river with the poly ferrosilicium coagulant of present embodiment preparation and existing polymerize aluminum chloride coagulating agent
MnValue is 7.18mg/L, UV
254Value is for 0.145mg/L), injected volume is 0.18mmol/L, the correlation curve after the processing as shown in Figure 2, as can be seen from Figure 2 the poly ferrosilicium coagulant of the present embodiment preparation ability of disposing of sewage is significantly better than existing polymerize aluminum chloride coagulating agent.
Claims (10)
1, a kind of poly ferrosilicium coagulant is characterized in that poly ferrosilicium coagulant made by 20%～60% water glass, 10%～30% dilute acid soln, 10%～50% ferrous sulfate and 1.5%～10% sodium chlorate by weight percentage; Wherein the solute of dilute acid soln is sulfuric acid, hydrochloric acid, phosphoric acid or acetate, and the concentration of dilute acid soln is 20%～50%.
2, a kind of poly ferrosilicium coagulant according to claim 1 is characterized in that poly ferrosilicium coagulant made by 40% water glass, 20% dilute acid soln, 30% ferrous sulfate and 10% sodium chlorate by weight percentage; The concentration of dilute acid soln is 35%.
3, a kind of poly ferrosilicium coagulant according to claim 1 and 2, the mass concentration that it is characterized in that silicon-dioxide in the water glass is 2%～8%.
4, the preparation method of poly ferrosilicium coagulant according to claim 1 is characterized in that the preparation method of poly ferrosilicium coagulant carries out according to following steps: one, take by weighing 20%～60% water glass, 10%～30% dilute acid soln, 10%～50% ferrous sulfate and 1.5%～10% sodium chlorate by weight percentage respectively; Two, under the stirring velocity of 400～600r/min water glass is joined in the dilute acid soln of a part, the pH value that makes mixing solutions is 2.0～3.5, and stopping stirring and control reaction temperature then is 20 ℃～60 ℃, behind reaction 1～10h, makes activated silicic acid; Three, be under the condition of 200～400r/min at 20 ℃～80 ℃, stirring velocity, ferrous sulfate and sodium chlorate are joined in the remaining dilute acid soln, add the activated silicic acid that step 2 makes behind 10～30min again, speed with 100～200r/min stirs 30～60min then, leaves standstill 2～24h again; Promptly obtain poly ferrosilicium coagulant; The solute of the dilute acid soln in the step 1 is sulfuric acid, hydrochloric acid, phosphoric acid or acetate, and the concentration of dilute acid soln is 20%～50%.
5, the preparation method of poly ferrosilicium coagulant according to claim 4 is characterized in that taking by weighing respectively by weight percentage in the step 1 30%～50% water glass, 15%～25% dilute acid soln, 20%～40% ferrous sulfate and 3%～8.5% sodium chlorate.
6, the preparation method of poly ferrosilicium coagulant according to claim 4 is characterized in that in the step 2 water glass being joined the pH value that makes mixing solutions in the dilute acid soln is 2.3～3.2.
7, the preparation method of poly ferrosilicium coagulant according to claim 4 is characterized in that control reaction temperature is 30 ℃～50 ℃ in the step 2.
8, the preparation method of poly ferrosilicium coagulant according to claim 4 is characterized in that in the step 3 that at 40 ℃～60 ℃, stirring velocity be under the condition of 250～350r/min, and ferrous sulfate and sodium chlorate are joined in the dilute acid soln.
9, the preparation method of poly ferrosilicium coagulant according to claim 4 is characterized in that in the step 3 adding that the speed with 120～180r/min stirs 40～50min behind the activated silicic acid.
10, the preparation method of poly ferrosilicium coagulant according to claim 4 leaves standstill 6～20h after it is characterized in that stirring in the step 3.
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