WO2007023874A1 - ヒュームドシリカ含有排水の処理方法 - Google Patents
ヒュームドシリカ含有排水の処理方法 Download PDFInfo
- Publication number
- WO2007023874A1 WO2007023874A1 PCT/JP2006/316541 JP2006316541W WO2007023874A1 WO 2007023874 A1 WO2007023874 A1 WO 2007023874A1 JP 2006316541 W JP2006316541 W JP 2006316541W WO 2007023874 A1 WO2007023874 A1 WO 2007023874A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fumed silica
- silica
- minutes
- concentration
- waste water
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/60—Silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
Definitions
- the present invention relates to a method for treating waste water containing fumed silica. More particularly, the present invention relates to a method of treating waste water containing fumed silica adjusted to a specific concentration.
- fumed silica is produced by a flame hydrolysis method and specifically obtained by burning a raw material consisting of silicon chloride in a flame, and a reinforcing agent, an abrasive, an external additive, It is used in various fields such as fillers and thickeners.
- the fumed silica thus produced is an aggregate of silica having a primary particle size of 5 to 50 nm and is very small in particle size, making it difficult to handle.
- the fumed sili force which is waste, is difficult to handle because it is fine particles, and has to be recovered and disposed of so as not to contaminate the working environment.
- fumed silica is produced from silicon chloride or the like, hydrogen chloride is by-produced during production, but fumed silica not recovered as a product is discharged together with this hydrogen chloride.
- the waste of fine particles such as fumed silica may scatter the particles during operation, which may contaminate the working environment or the environment of the handling area.
- a method of processing fine powder a method of solidifying fine particles as a mass has been proposed.
- Japanese Patent Publication No. 4_75796 describes a flocculating agent for water treatment comprising a silica sol-metal salt.
- JP-B-4-75796 only the treatment of water whose turbidity is described is performed, and the fumed silica-containing drainage to which the present invention is applied The treatment method is not shown. Disclosure of the invention
- an object of the present invention is to provide a method of easily handling fumed silicic acid which is easy to operate and which becomes waste.
- Another object of the present invention is to provide a fumed silica containing waste water which can be stably coagulated when treated with fumed silica containing waste water, and can sufficiently reduce the turbidity of water when the aggregates are separated. It is to provide a processing method.
- waste fumed silica is dispersed in water and recovered, and the recovered fumed silica-containing waste water is adjusted as it is or at a specific concentration, and an inorganic flocculant is contained, organic polymer flocculant It has been found that the above object can be achieved by the addition of H. Thus, the present invention has been accomplished.
- fumed silica as waste is dispersed in water and recovered, and the waste silica containing the recovered fumed silica is treated when the fumed silica is treated.
- the concentration is from 0.50 to 3.0% by mass
- the inorganic flocculant containing metal can be added to the waste silica containing waste silica or the fumed silica containing waste water whose fumed silica concentration is adjusted to a concentration of 0.5 to 3.0% by mass, in terms of metal conversion 15 to 3
- the method is a treatment method for silica-containing waste water, which is contained so as to have a concentration of 0 O m gZL, and then, an organic polymer flocculant is added.
- the fumed silica force discharged as waste from the process of handling fumed silica as powder includes, for example, the loss remaining in the piping, the apparatus, the bag and the like when it is taken out from the packing or the bag. This occurs in factories producing fumed silica and factories handling powdered fumed silica.
- fumed silica is produced from silicon chloride or the like, so hydrogen chloride is by-produced during production of fumed silica.
- this fumed silica is also included in the object of the treatment, since the fumed silica is not recovered as a product together with the hydrogen chloride.
- the fumed silica to be a waste material is recovered by dispersing the material discharged from the above process in water.
- the fumed silica discharged during packing, etc. in water and treating it By dispersing the fumed silica discharged during packing, etc. in water and treating it, the scattering of fumed silica can be prevented, and contamination of the working environment can be reduced.
- fumed silica, which was not recovered as a product together with hydrogen chloride at the time of producing fumed silica can be recovered by removing the fumed silica, which is waste, with water beforehand, when recovering hydrogen chloride as hydrochloric acid. .
- the fumed silica By removing the fumed silica as waste from the hydrogen chloride gas containing fumed silica using water, the fumed silica can be efficiently dispersed and recovered in water.
- the water used to remove dust may be a hydrochloric acid aqueous solution containing hydrogen chloride.
- the fumed silica-containing waste water dispersed and collected in water can be used as it is when the concentration of fumed silica is 0.5 to 3.0% by mass, but when it is out of this concentration range , Adjust to this concentration range This is very important. In general, as aggregation treatment of drainage, it is advantageous that the smaller the total amount of drainage is, the less waste will be.
- the amount of water to be discarded decreases as the amount of suspended matter contained in the drainage (in the present invention, the amount of fumed silica) increases, and during the solid-liquid separation operation of the next step It is extremely advantageous.
- the concentration of fumed silica exceeds 3.0% by mass
- the condensation treatment can be performed stably. It turned out not.
- the concentration of fumed silica exceeds 3.0% by mass, aggregates become bulky, and sedimentation performance can not be achieved, so that sufficient concentration and separation can not be performed.
- the concentration of fumed silica is less than 0.5% by mass, the amount of drainage increases relative to the amount of fumed silica, which is not efficient.
- concentration of fumed silica contained in the fumed silica-containing waste water is more preferably 0.1 to 1% by mass in consideration of stable aggregation treatment and efficiency.
- the method of adjusting the concentration of the fumed silica-containing wastewater is not particularly limited, so that the concentration of the fumed silica in the wastewater becomes 0.5 to 3.0 mass%. Adjust the amount of drainage and silica. For example, when packing, etc., the loss remaining in piping, equipment, etc. is recovered, and a sufficient amount of water is used to adjust the concentration of fumed silica to satisfy the above range. In addition, when the loss is recovered using a small amount of water, it is possible to adjust by adding water etc. so that the concentration in the recovered fumed silica-containing wastewater satisfies the above range.
- fumed silica when fumed silica is produced, if the fumed silica contained in hydrogen chloride gas is recovered by removing dust, the amount of water is determined according to the amount of fumed silica to be discharged, and the fumed fumes can be obtained. Adjust the concentration of the silica-containing wastewater to the above range. Also in this case, when fumed silica is recovered with a small amount of water, water may be added so that the amount of fumed silica satisfies the above range. Can.
- the fumed silica-containing waste water generated during the packing the fumed silica-containing waste water recovered from hydrogen chloride gas, and
- the concentration of fumed silica contained in the resulting waste water can also be adjusted to 0.5 to 3.0% by mass by mixing.
- the fumed silica when adjusting the concentration of the fumed silica-containing wastewater, when fumed silica which is a waste product is recovered with a small amount of water, the fumed silica can be fumed by adding other wastewater.
- the concentration of silica can also be 0.5 to 3.0% by mass.
- the other waste water may be one which does not change the properties of the fumed silica-containing waste water by interaction, for example, it may be one which does not change the viscosity, etc. waste water containing inorganic suspended substances other than fumed silica.
- waste water containing silicon powder for example, metallic silicon and silicon chips as suspended matter (hereinafter sometimes referred to as waste containing silicon powder)
- fumed silica containing waste water Because they do not interact, they can be effectively used to adjust the concentration of fumed silica.
- silicon powder-containing waste water is often generated at the same place as the fumed water containing waste water is generated, and the waste water can be efficiently treated by treating both simultaneously. That is, since silicon chlorides, which are raw materials of fumed silica, can be obtained by using metallic silicon in a reaction, waste water containing the metallic silicon is discharged. In addition, silicon chlorides are also used in the manufacture of silicon, and when cutting this silicon, waste water containing silicon chips is discharged.
- each drainage can be added to the fumed silica-containing drainage and used.
- the condensation treatment method described in detail later since suspended substances of both fumed silica and silicon powder can be coagulated and precipitated, waste can be treated efficiently.
- waste water containing fumed silica-containing waste water mixed with silicon-containing waste water it is necessary to expand the pH range when using metal-containing inorganic coagulants and organic polymer coagulants. Operation is also effective.
- the concentration of fumed silica is set to 0.05 to 3.0% by mass with respect to the total drainage volume.
- the pH of the fumed silica-containing waste water can be determined by a preliminary test so as to obtain an optimum pH H that can be performed efficiently with a cohesive processing power S when treating a large amount of waste water.
- the properties of the fumed silica in the fumed silica-containing waste water are not different from those of ordinary products and are not particularly limited, but in the treatment method of the present invention, the average primary particle size is 1 to 5 nm, specific surface area 40 to 400 m
- fumed silica can be agglomerated.
- an inorganic flocculant consisting of a silica sol-iron salt and a silica sol-aluminum salt, even if it is a fumed silica having a specific surface area of 140 m 2 / g or less, it is easily agglomerated.
- the turbidity of the supernatant can be reduced to 10 degrees or less.
- the fumed silica-containing waste water having a fumed silica concentration of 0.5 to 3.0% by mass contains an inorganic flocculant containing a metal in an amount of 15 to 5 in metal conversion.
- the inorganic flocculant can be continuously added to the fumed silica-containing wastewater so as to fall within the above range, or the inorganic flocculant may be added in multiple stages. You can do it.
- the temperature at the time of aggregation treatment by containing the inorganic coagulant is not particularly limited, but in view of operability, it is preferably 5 to 40, more preferably 1 to 3 It is 0.
- the inorganic coagulant containing the metal is an inorganic coagulant containing a metal element.
- metal salts such as aluminum salts and iron salts, and combinations of these metal salts with silica sol.
- Specific examples of the inorganic flocculant include aluminum sulfate, ferric chloride, ferrous sulfate, polyiron sulfate, silica sol monoiron salt, silica sol aluminum salt and the like. Among them, in order to remove the suspended matter having a very high sedimentation rate of the supernatant liquid of 10 degrees or less, the sedimentation speed of the aggregate is high after the addition of the organic polymer flocculant.
- an inorganic coagulant comprising an aluminum salt, wherein the molar ratio of silicon to iron or aluminum is from 0.53 to 3 or less, silica sol, ferrous salt, silica sol, aluminum salt
- the inorganic coagulant which consists of it is put together, and it may be called a silica sol type inorganic coagulant.
- the inorganic flocculant composed of the silica sol monoiron salt is a complex containing silica sol which is a polymer and iron, and the silica sol is mixed with ferric chloride, ferrous sulfate and polyiron sulfate. It can be obtained by Similarly, the inorganic flocculant made of the above-mentioned silica sol aluminum salt is a composite containing silica sol as a polymer and aluminum, and can be obtained by mixing aluminum sulfate with silica sol.
- the supernatant liquid is not colored, which makes it easy to reuse the supernatant liquid.
- the silica sol based inorganic flocculant has a molar ratio of silicon to iron or aluminum (hereinafter referred to as “Sino Fe molar ratio, S i 1 molar ratio”) of 0.05 to 3.0. Is preferred.
- S i s Fe or S i Z A l By setting the molar ratio of S i s Fe or S i Z A l to 0.5 to 3.0, the turbidity of the supernatant can be further reduced, and the settling speed of the aggregates is increased to improve the separation efficiency. It can be raised.
- the S 1 / ⁇ e or S i / 1 molar ratio is preferably 0.05 to 2.0, more preferably 0.05 to 1.5.
- the fumed silica-containing wastewater is expected to have a large amount of wastewater because the concentration of fumed silica is set to 0.5 to 3.0 mass%.
- the silica sol inorganic coagulant when used, the sedimentation speed of the aggregates is increased, and the turbidity of the supernatant liquid is 10 degrees or less, more preferably 3 degrees if it is optimized. Since the following can be carried out, depending on the composition of the dissolved substance contained in the supernatant liquid, it can be reused in the manufacturing process or reused as concentration-adjusted water in this waste water treatment.
- the inorganic flocculant consisting of silica sol and monoiron salt having a Si / F e molar ratio of 0.5 to 3.0 is, for example, a reaction of an aqueous solution of sodium silicate with a mineral acid containing no halogen.
- a silica sol is formed by the method described above, and the silica sol can be produced by mixing ferric chloride or the like so that the Si / Fe molar ratio is 0.5 to 3.0.
- an inorganic coagulant comprising a silica sol-aluminum salt having a molar ratio of 0.50 to 3.0 is, for example, a reaction between a sodium silicate aqueous solution and a halogen-free mineral acid.
- a silica sol is formed by the above method, and the silica sol is prepared by mixing aluminum sulfate or the like so that the molar ratio of S i ZA becomes 0.5 to 3.0.
- the silica sol in order to exhibit excellent effects of the obtained silica sol based inorganic flocculant, for example, after silica sol is formed by a method as described in JP-A-2003-221222 etc., the silica sol is produced. Is preferably mixed with ferric chloride or aluminum sulfate.
- a mixture obtained by causing the respective solutions to collide with each other is matured using a Y-shaped, double-sided, etc. type reaction apparatus with an aqueous solution of silica soda and a mineral acid containing no halogen such as sulfuric acid,
- the aged mixture is diluted to form a silica sol, and the silica sol is mixed with ferric chloride or aluminum sulfate.
- the above-mentioned ripening means that the polymerization of the silica sol proceeds in a mixture containing the silica sol.
- silica sol-based inorganic flocculant one having a pH of 1.5 to 2.5 and an S i concentration in the range of 5 to 25 g / L It is preferable because it is well balanced.
- the viscosity of the silica sol inorganic coagulant is preferably 1 to 5 mPa ⁇ s.
- the silica sol based inorganic flocculant satisfying the above range is prepared by using a Y-shaped, T-shaped reactor or the like to produce a silica sol having a viscosity of 3 to 6 mP a 's, and this silica sol contains ferric chloride. Alternatively, it can be produced by mixing aluminum sulfate. In addition, by using the silica sol having the above-mentioned viscosity, it is possible to efficiently adjust, in a short time, a siliceous sol-based inorganic flocculant having a high degree of polymerization and an increased beaded structure.
- the silica sol based inorganic coagulant comprises nanoparticles. And since they are nanoparticles, the aggregation effect of fine particles containing fumed silica and, depending on the waste water, can be increased. Furthermore, the silica sol based inorganic flocculant is an adsorption effect of particulates containing fumed silica by Fe 3 + , A 13 + 3 or the like and, depending on the drainage, silicon powder, aggregation precipitation effect of the particulates by silica sol, and the like Therefore, it can exhibit superior effects than the system in which silica sol and ferric chloride, or sol and aluminum sulfate are separately added. Next, the amount of the inorganic coagulant to be contained in the fumed silica-containing waste water will be described.
- the inorganic coagulant contained in the fumed silica-containing waste water has a concentration of 15 to 30 O m gZL, more preferably 20 to 25 O m g ZL, in terms of metal. It is important to contain it.
- the metal-containing inorganic coagulant is, for example, aluminum sulfate
- aluminum sulfate is added to the fumed silica-containing wastewater so that the concentration of aluminum becomes 15 to 30 O m gZL. Mix.
- the silica sol inorganic coagulant is added to the fumed silica-containing waste water so that the concentration of iron or aluminum contained in the coagulant is 15 to 30 O mgZL. Mix.
- the amount of the inorganic flocculant to be contained in the fumed silica-containing waste water is less than 15 mg ZL in terms of metal, it is not preferable because the turbidity of the supernatant liquid can not be sufficiently reduced.
- it exceeds 300 mg ZL an excess of inorganic flocculant will be used, which is economically Furthermore, sedimentation and concentration become difficult because the bulk volume of aggregates increases.
- the concentration of the inorganic coagulant containing metal is preferably 20 to 25 O mg ZL, in terms of metal, in consideration of the effect of reducing the turbidity of the supernatant, sedimentation concentration and economy.
- the pH of fumed silica-containing wastewater (hereinafter sometimes referred to as treated wastewater) containing the inorganic coagulant is not particularly limited, but it is preferably 5 to 10 More preferably, it is controlled to 5.5-9.
- the fumed silica-containing wastewater contains silicon powder S
- the pH of the treated wastewater by controlling the pH of the treated wastewater to a range of 5 to 10, the treated wastewater can be treated even if the pH is outside the above range.
- the effect of the organic polymer flocculant described in detail later can be enhanced.
- the pH of the treated wastewater when the pH of the treated wastewater is controlled to 5 to 10, a method of controlling pH by adding an inorganic coagulant containing metal to fumed silica-containing wastewater, the inorganic coagulant After adding, it is possible to adopt a control method by further adding acid or alkali. That is, when the pH of the treated waste water to which the inorganic flocculant containing metal is added is 5 to 10, then the organic polymer flocculant can be added as it is. Furthermore, when the pH of treated wastewater is out of the range of 5 to 10 by adding an inorganic coagulant containing metal, it is also possible to control the pH to 5 to 10 by adding an acid or an alkali.
- the fumed silica-containing wastewater When it is intended to control pH by adding an inorganic coagulant containing metal to the fumed silica-containing wastewater, the fumed silica-containing wastewater is treated so that the pH of the treated wastewater satisfies the above range 'in advance. You can also adjust the pH of. Next, the organic polymer flocculant added to the treated wastewater will be described.
- an organic polymer flocculant is then added to the treated wastewater.
- the addition of the organic polymer flocculant can improve the efficiency of the flocculation treatment.
- the temperature at which the organic polymer flocculant is added is not particularly limited, but in view of operability, it is preferably 5 to 40, more preferably 10 to 30 ° C.
- the organic polymer flocculant in the present invention is not particularly limited, and known flocculants can be used.
- the amount of the organic polymer flocculant to be added is appropriately adjusted according to the type and properties of the fumed silica waste water and the organic polymer flocculant, but the amount of the treated polymer wastewater is preferably 0.1. 1 to 10 mg ZL, more preferably 0.5 to 5 mg / L.
- the addition amount of the organic polymer flocculant satisfies the above range, the flocculating effect can be enhanced, and the processing can be efficiently performed without increasing the separation resistance when separating the flocculated precipitate.
- a known method can be used as a method of separating the flocculated aggregate (precipitate) after adding the organic polymer flocculant.
- Specific examples include methods such as decantation, filter press, centrifugation, belt filter, multiple disk dehydrator, and screen press.
- the amount of suspended solids in the fumed silica-containing wastewater, the composition and the like differ depending on each wastewater, so a small amount of fumed silica-containing wastewater is used. It is preferable to treat after finding the optimum treatment conditions in advance, ie, the fumed silica-containing waste water, the optimum pH for treated waste water, the addition amount of the inorganic flocculant, the addition amount of the organic high molecular weight flocculant, etc. .
- the treated water after addition of the organic polymer flocculant can have the turbidity of the supernatant liquid at 15 degrees or less by the measurement method described later. Therefore, the treated water from which the aggregates are separated has low turbidity, so it is discharged as waste water without secondary treatment. And become possible. Furthermore, when a silica sol inorganic coagulant is used as the inorganic coagulant, the turbidity of the treated water is preferably 10 degrees or less, more preferably 5 degrees or less, and even more preferably 3 degrees or less. Can. Therefore, when a silica sol based inorganic flocculant is used, it can be reused for the production process according to the composition of the dissolved substance contained in the treated water.
- the agglomerated aggregate contains silica etc. depending on silica, aluminum, iron and waste water, it can be reused as a valuable resource for cement raw materials and bricks etc.
- waste silica which is waste
- the concentration of the obtained fumed silica-containing waste water the waste water can be stably coagulated.
- waste water containing metallic silicon hereinafter sometimes referred to as waste containing silicon powder
- the concentration of both the fumed silica and the metal silicon can be made into aggregates during the aggregation process, which is efficient, and the efficiency in the next step, the solid-liquid separation step is also increased, and is more effective.
- water from which aggregates are separated has a low turbidity, and therefore can be discharged without secondary treatment.
- silica sol-monoiron salt or silica sol-aluminum salt is used as the inorganic coagulating agent
- the turbidity of the supernatant can be made 10 degrees or less, so it is not only discharge but also treatment.
- it can be reused in the manufacturing process. Further, it can be used to adjust the concentration of fumed silica.
- the aggregate separated by the method of the present invention contains iron, aluminum, silica and the like, and can be reused as a valuable resource as a raw material of cement and brick.
- the turbidity of the supernatant after aggregation treatment was measured with a spectrophotometer (wavelength: 660 nm, cell length: 10 mm) according to J I S K 0101.
- silica sol (S i 0 2 : 151.8 g / L).
- the silica sol was aged without stirring until it had a viscosity of 1 OmPa ⁇ s, and then diluted with 622.2 liters of water to prepare a diluted silica sol with a concentration of 25 g ZL of S i 0 2 .
- the diluted silica sol had a pH of 1.92, and a viscosity of 3.8 mPa's.
- the diluted silica sol and aluminum sulfate were mixed at a constant ratio, and used as an inorganic flocculating agent composed of silica sol monoaluminum salt as a flocculant of fumed silica-containing waste water.
- Table 1 shows the mixing ratio of the inorganic flocculant made of silicic sol-aluminum salt. Also, the A 1 concentration in the used aluminum sulfate was 56.66 gZL. table 1
- Diluted sodium silicate prepared by diluting commercially available silica soda and sulfuric acid with water respectively
- the diluted silica sol and ferric chloride were mixed in a fixed ratio and used as a flocculant of fumed silica-containing waste water as an inorganic flocculant composed of silicic sol-iron salt.
- the mixing ratio of the inorganic flocculant consisting of silica sol and iron salt is shown in Table 2.
- the Fe concentration in the ferric chloride used was 191. 8 gZL. Table 2
- the fumed silica-containing waste water As the fumed silica-containing waste water, the waste water generated during packing and the waste water discharged for preventing the concentration of silica when absorbing and recovering hydrogen chloride (the waste water for removing fumed silica and removing it) are mixed. Then, the fumed silica-containing waste water whose fumed silica concentration was adjusted to 0.58 mass% was used. This waste water contains 22 ⁇ m of the average primary particle size of fumed silica and a specific surface area of 90 m 2 Zg, and the pH was adjusted to 6.7. The turbidity of the fumed silica-containing wastewater before this aggregation treatment was over 100.
- This fumed silica-containing waste water 500 m 1 is collected in a 50 O ml beaker, and while stirring at a stirring speed of 150 rpm, the S i / A 1 molar ratio of the inorganic flocculant comprising the silica sol-aluminum salt shown in Production Example 2
- a solution of 0.25 (A1: 2.51 g / 100 m1) was added to 0.4 ml (2 Omg-A1ZL). After the addition, the pH dropped to 4.2, so it was adjusted to pH 6.7 with 1N-NaOH and stirred for 5 minutes.
- Example 2 The same drainage as in Example 1 was adjusted with silicon powder-containing drainage containing metallic silicon.
- the adjusted concentration of fumed silica was 0.25 mass%, and the concentration of metallic silicon was 0.93 mass%.
- the turbidity of the fumed silica-containing wastewater before this aggregation treatment was over 100.
- This waste water (50 Oml) is collected in a 50 Oml beaker and stirred with a stirring speed of 150 rpm.
- a solution of 25 (A1: 2.51 gZ 100 m1) was added to the solution (0.4 ml (2 Omg-A1 ZL)).
- the volume change rate of the precipitated substance after standing for 5 minutes and the supernatant after standing for 10 minutes were sampled to measure turbidity.
- the volume change rate at this time was 56.0%, and the turbidity of the supernatant was 1.8.
- the results are shown in Table 3.
- the waste water 50 Oml similar to Example 3 is collected in a 50 Om 1 beaker, and while stirring at a stirring speed of 150 rpm, S i ZF e mol of the inorganic flocculant comprising the silica sol monoiron salt shown in Production Example 6
- a solution with a ratio 1 (Fe: 1.7 g / 100 m 1) was added to 0.6 m 1 (2 Omg-F e / L). After the addition, the pH dropped to 3.8, so it was adjusted to pH 7.4 with IN-NaOH and stirred for 5 minutes.
- the waste water 50 Oml similar to Example 3 is collected in a beaker of 50 Om 1 and stirred at a stirring speed of 1 ⁇ 0 r pm while the inorganic flocculant S i ZF is composed of the silica sol monoiron salt shown in Production Example 5 0.2 ml (2 Omg-Fe / L) of a solution with an e molar ratio of 0.25 (Fe: 5.38 gZ 10 Om 1) was added. After the addition, the pH dropped to 3.7, so it was adjusted to pH 7.2 with 1N-NaOH and stirred for 5 minutes. Next, 0.
- the waste water 50 Oml similar to Example 3 is collected in a 500 m 1 beaker and stirred with an agitation speed of 150 rpm, and the aluminum sulfate of AL concentration 5 ⁇ 65 g / 10 Om 1 is removed 0 18 ml (2 Omg-A 1 ZL) was added. After the addition, the pH dropped to 4.4, so the pH was adjusted to 7.4 with IN-NaOH and stirred for 5 minutes. Next, 0.5 ml of 0.2% by mass Cliff Rock PA 331 was added, and the mixture was stirred for 5 minutes at a stirring speed of 40 rpm and allowed to stand for 10 minutes.
- Example 3 Collect 50 Oml of the waste water as in Example 3 into a 50 Om 1 beaker and stir speed A solution of an inorganic flocculant having a silica sol and an aluminum salt shown in Preparation Example 2 at a molar ratio of 0.25 (A1: 2.51 gZ 100 ml) of 0.14 ml while stirring at 150 rpm (2 Omg-A 1 / L) was added. After the addition, the pH decreased to 4.4, so that the pH was adjusted to 1N-NaOH T pH 7.6 and stirred for 5 minutes.
- the volume change rate of the precipitated substance after standing for 5 minutes and the supernatant after standing for 10 minutes were sampled to measure turbidity.
- the volume change rate at this time was 40.0%, and the turbidity of the supernatant was 1.8.
- the results are shown in Table 3.
- waste fumes containing fumed silica waste water generated during packing, and waste water discharged for preventing concentration of silica when absorbing and recovering hydrogen chloride (waste water used for dusting and recovering fumed silica) It mixed and used the fumed silica containing drainage whose fumed silica concentration was 5.0% by mass.
- This waste water contains fumed silica with an average primary particle size of 22 nm and a specific surface area of 90 m 2 / g, and the pH was adjusted to 6.2.
- the turbidity of the fumed silica-containing wastewater before this aggregation treatment was 100 or more.
- This fumed silica containing drainage 50 Oml 5 The reaction mixture is collected in 00 ml beaker and stirred at a stirring speed of 150 rpm. 2. A solution of 51 g / 100 m 1) was added to 0.4 ml (2 Omg-A 1 / L). After the addition, the pH dropped to 3.5, so it was adjusted to pH 6.8 with 1N-NaOH and stirred for 5 minutes. Next, 0.5 ml of 0.2% by mass Clifflock P 8331 was added, and the mixture was stirred for 5 minutes at a stirring speed of 40 rpm and allowed to stand for 10 minutes. The volume change rate of the precipitated substance after standing for 5 minutes and the supernatant after standing for 10 minutes were sampled to measure turbidity. The volume change rate at this time was not measured because the aggregate sediment did not settle at all. In addition, the turbidity was over 100. The results are shown in Table 3.
- the waste water 50 Oml similar to Example 3 is collected in a beaker of 50 Om 1 and stirred with a stirring speed of 150 rpm, the inorganic coagulant S i / of the inorganic flocculant consisting of the silica sol-aluminum salt shown in Production Example 2
- a solution of A 1 molar ratio of 0.25 (A 1: 2.51 g Zl 0 Om 1) was added as shown in Table 3.
- the pH was lowered, so that the pH was adjusted to the neutral region with IN-NaOH, and stirring was performed for 5 minutes.
- S1ZA1 represents a silica sol-aluminum salt
- SiZFe represents an inorganic flocculant composed of a silica sol-monoiron salt.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/990,739 US7988866B2 (en) | 2005-08-24 | 2006-08-17 | Method of treating fumed silica-containing drainage water |
CN2006800251130A CN101218179B (zh) | 2005-08-24 | 2006-08-17 | 含热解硅石的废水的处理方法 |
CA002620066A CA2620066A1 (en) | 2005-08-24 | 2006-08-17 | Method for treating fumed silica-containing drainage water |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-242792 | 2005-08-24 | ||
JP2005242792 | 2005-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007023874A1 true WO2007023874A1 (ja) | 2007-03-01 |
Family
ID=37771617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/316541 WO2007023874A1 (ja) | 2005-08-24 | 2006-08-17 | ヒュームドシリカ含有排水の処理方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7988866B2 (ja) |
KR (1) | KR101001610B1 (ja) |
CN (1) | CN101218179B (ja) |
CA (1) | CA2620066A1 (ja) |
WO (1) | WO2007023874A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111689560A (zh) * | 2020-06-12 | 2020-09-22 | 新疆大全新能源股份有限公司 | 一种含硅高盐废水的除硅工艺 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101974594B1 (ko) * | 2017-09-25 | 2019-05-02 | (주)이앤켐솔루션 | 산성광산배수 슬러지를 이용한 인 제거용 무기 흡착제의 제조방법 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06134469A (ja) * | 1992-10-22 | 1994-05-17 | Sumitomo Sitix Corp | シリコン切削廃液の処理方法 |
JPH1133560A (ja) * | 1997-07-15 | 1999-02-09 | Kurita Water Ind Ltd | Cmp排液の凝集処理方法 |
JP2000140861A (ja) * | 1998-11-06 | 2000-05-23 | Nomura Micro Sci Co Ltd | 微細砥粒子分散研磨液を含む排水の処理方法 |
JP2002018206A (ja) * | 2000-07-04 | 2002-01-22 | Nittetsu Mining Co Ltd | 新規の凝集剤及びその製造方法 |
JP2002326003A (ja) * | 2001-05-02 | 2002-11-12 | Nittetsu Mining Co Ltd | 凝集剤の製造方法 |
JP2003038908A (ja) * | 2001-05-25 | 2003-02-12 | Tokuyama Corp | 水処理用凝集剤の製造方法 |
JP2003285074A (ja) * | 2002-03-28 | 2003-10-07 | Mitsubishi Paper Mills Ltd | 微粒子シリカ含有酸性廃液の凝集・沈殿処理方法 |
JP2004261708A (ja) * | 2003-02-28 | 2004-09-24 | Kurita Water Ind Ltd | シリコン微粒子及び/又はコロイドシリカ含有排水の凝集処理方法 |
JP2005152880A (ja) * | 2003-11-06 | 2005-06-16 | Sanyo Electric Co Ltd | 凝集剤およびその製造装置、製造方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63130189A (ja) * | 1986-11-21 | 1988-06-02 | Suido Kiko Kk | 水処理方法及び水処理用凝集剤 |
JP3014516B2 (ja) | 1990-10-15 | 2000-02-28 | 天龍工業株式会社 | 乗物用座席 |
JP2707479B2 (ja) | 1992-08-28 | 1998-01-28 | 株式会社巴川製紙所 | 微粉末の処理方法及び装置 |
JP3340029B2 (ja) | 1996-07-22 | 2002-10-28 | 株式会社荏原製作所 | SiO2 含有廃水の処理方法 |
US5965027A (en) * | 1996-11-26 | 1999-10-12 | Microbar Incorporated | Process for removing silica from wastewater |
JP4000205B2 (ja) | 1997-05-26 | 2007-10-31 | 株式会社トクヤマ | シリコン廃液から切削粉を分離する方法 |
KR20010101520A (ko) * | 1999-01-15 | 2001-11-14 | 로날드 제이. 알레인, 지이 엠 브랜논, 더블유 이 패리 | 반도체 폐수로부터 금속이온들을 침전시킴과 동시에미소여과기 조작을 강화시키기 위한 조성물 및 방법 |
JP3697361B2 (ja) * | 1999-01-28 | 2005-09-21 | シャープ株式会社 | 排水処理方法および排水処理装置 |
US6203711B1 (en) * | 1999-05-21 | 2001-03-20 | E. I. Du Pont De Nemours And Company | Method for treatment of substantially aqueous fluids derived from processing inorganic materials |
FR2802912B1 (fr) * | 1999-12-27 | 2002-02-15 | Eastman Kodak Co | Procede pour preparer un polymere d'aluminosilicate |
JP2001276599A (ja) | 2000-03-31 | 2001-10-09 | Mitsubishi Heavy Ind Ltd | 微粉処理方法及び微粉処理装置 |
JP4014882B2 (ja) | 2002-01-30 | 2007-11-28 | 株式会社トクヤマ | シリカゾルの製造方法 |
TWI309579B (en) * | 2003-11-06 | 2009-05-11 | Sanyo Electric Co | Method for preparing coagulant, and method for coagulation treatment of fluid |
JP4075796B2 (ja) | 2003-12-24 | 2008-04-16 | トヨタ自動車株式会社 | 車両用制御装置、車両用制御方法及び車両用制御システム |
US7674374B2 (en) * | 2005-11-01 | 2010-03-09 | Robles Antonio T | Method for preparing acidic solutions of activated silica and polyvalent metal salt for water treatment |
-
2006
- 2006-08-17 US US11/990,739 patent/US7988866B2/en active Active
- 2006-08-17 WO PCT/JP2006/316541 patent/WO2007023874A1/ja active Application Filing
- 2006-08-17 CA CA002620066A patent/CA2620066A1/en not_active Abandoned
- 2006-08-17 CN CN2006800251130A patent/CN101218179B/zh active Active
- 2006-08-17 KR KR1020077030064A patent/KR101001610B1/ko active IP Right Grant
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06134469A (ja) * | 1992-10-22 | 1994-05-17 | Sumitomo Sitix Corp | シリコン切削廃液の処理方法 |
JPH1133560A (ja) * | 1997-07-15 | 1999-02-09 | Kurita Water Ind Ltd | Cmp排液の凝集処理方法 |
JP2000140861A (ja) * | 1998-11-06 | 2000-05-23 | Nomura Micro Sci Co Ltd | 微細砥粒子分散研磨液を含む排水の処理方法 |
JP2002018206A (ja) * | 2000-07-04 | 2002-01-22 | Nittetsu Mining Co Ltd | 新規の凝集剤及びその製造方法 |
JP2002326003A (ja) * | 2001-05-02 | 2002-11-12 | Nittetsu Mining Co Ltd | 凝集剤の製造方法 |
JP2003038908A (ja) * | 2001-05-25 | 2003-02-12 | Tokuyama Corp | 水処理用凝集剤の製造方法 |
JP2003285074A (ja) * | 2002-03-28 | 2003-10-07 | Mitsubishi Paper Mills Ltd | 微粒子シリカ含有酸性廃液の凝集・沈殿処理方法 |
JP2004261708A (ja) * | 2003-02-28 | 2004-09-24 | Kurita Water Ind Ltd | シリコン微粒子及び/又はコロイドシリカ含有排水の凝集処理方法 |
JP2005152880A (ja) * | 2003-11-06 | 2005-06-16 | Sanyo Electric Co Ltd | 凝集剤およびその製造装置、製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111689560A (zh) * | 2020-06-12 | 2020-09-22 | 新疆大全新能源股份有限公司 | 一种含硅高盐废水的除硅工艺 |
Also Published As
Publication number | Publication date |
---|---|
KR20080035520A (ko) | 2008-04-23 |
CN101218179A (zh) | 2008-07-09 |
US20080264871A1 (en) | 2008-10-30 |
CN101218179B (zh) | 2010-12-08 |
CA2620066A1 (en) | 2007-03-01 |
US7988866B2 (en) | 2011-08-02 |
KR101001610B1 (ko) | 2010-12-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR101008276B1 (ko) | 실리콘분 함유 배수의 처리 방법 | |
JP2003500192A (ja) | 無機材料の加工に由来する本質的に水性の流体の処理のための方法 | |
JP5522897B2 (ja) | ヒドロキサム酸化ポリマーの水中油中水エマルジョンおよびこれらを使用するための方法 | |
JP4630240B2 (ja) | シリコン粉含有排水の処理方法 | |
MXPA97006284A (en) | Method and method of separation of auto-floculac | |
CN109937190A (zh) | 废水处理方法和废水处理装置 | |
JP6244799B2 (ja) | 高純度蛍石の製造方法 | |
WO2007023874A1 (ja) | ヒュームドシリカ含有排水の処理方法 | |
JP4522297B2 (ja) | 無機懸濁粒子を含む排水の処理方法及び装置 | |
JP7083274B2 (ja) | 水処理方法および水処理装置 | |
JP4644164B2 (ja) | ヒュームドシリカ含有排水の処理方法 | |
CN106830248A (zh) | 用于油田污水的磁性纳米水处理剂的制备方法 | |
JP4184069B2 (ja) | 水処理用無機凝集剤およびその使用方法 | |
JP2010172882A (ja) | 凝集剤及び汚濁廃水の処理方法 | |
JP2010172883A (ja) | 凝集剤及び汚濁排水の処理方法 | |
JP3741269B2 (ja) | 排水処理剤、排水の処理方法及びその装置 | |
He et al. | Differently charged polyacrylamides (PAMs) significantly affect adsorption affinity and associated floc growth behaviors during ballasted flocculation: Performance and mechanism | |
JPH1043770A (ja) | 懸濁粒子を含む排水の処理方法 | |
RU2763356C1 (ru) | Способ получения алюмокремниевого коагулянта-флокулянта | |
RU2661584C1 (ru) | Способ получения гибридного алюмокремниевого реагента для очистки природных и промышленных сточных вод и способ очистки природных и промышленных сточных вод этим реагентом | |
JPS6265940A (ja) | 酸性塩化鉄水溶液の脱珪方法 | |
JPH11310412A (ja) | 鉄・活性シリカ複合液、その製造方法及びその装置 | |
JP3840857B2 (ja) | 無機質粒子を主体とするスラッジの脱水方法並びにその脱水用調質剤 | |
JP2001137900A (ja) | 無機質粒子を主体とするスラッジの脱水方法並びにその脱水用調質剤 | |
JP2019198864A (ja) | 水処理方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200680025113.0 Country of ref document: CN |
|
DPE2 | Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1020077030064 Country of ref document: KR |
|
ENP | Entry into the national phase |
Ref document number: 2620066 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11990739 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06796704 Country of ref document: EP Kind code of ref document: A1 |