WO2006022230A1 - フッ素含有廃水の処理方法およびフッ素含有廃水の処理設備 - Google Patents
フッ素含有廃水の処理方法およびフッ素含有廃水の処理設備 Download PDFInfo
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- WO2006022230A1 WO2006022230A1 PCT/JP2005/015218 JP2005015218W WO2006022230A1 WO 2006022230 A1 WO2006022230 A1 WO 2006022230A1 JP 2005015218 W JP2005015218 W JP 2005015218W WO 2006022230 A1 WO2006022230 A1 WO 2006022230A1
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- fluorine
- containing wastewater
- magnesium
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- compound
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- 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
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- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- 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
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- 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
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- 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
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/346—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from semiconductor processing, e.g. waste water from polishing of wafers
Definitions
- the present invention relates to a method for treating fluorine-containing wastewater and a facility for treating fluorine-containing wastewater, and in particular, a semiconductor / liquid crystal manufacturing plant, a fluorine compound manufacturing plant, a light bulb manufacturing plant, a steel plate manufacturing plant, and a stainless steel pickling plant.
- the present invention relates to a method for treating fluorine-containing wastewater discharged from fertilizer factories and the like and a facility for treating fluorine-containing wastewater.
- Patent Document 1 Japanese Patent Laid-Open No. 5-293474 (refer to claims)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-38368 (see claims)
- the separated calcium fluoride-containing sludge obtained by simply separating the fluorine from the fluorine-containing wastewater as calcium fluoride-containing sludge is used as hydrogen fluoride (HF) and other raw materials.
- HF hydrogen fluoride
- the momentum to recycle is increasing.
- source gases used for plasma CVD SiH, P
- Refractory waste gases such as soot are burned and decomposed because of their high global warming potential.
- secondary hydrogen fluoride and the like are released to the atmosphere after being cleaned with a scrubber.
- a large amount of cleaning wastewater generated by cleaning contains fluorine. It is desired to develop a technology to recover and reuse the fluorine in this cleaning wastewater.
- Calcium compounds are usually used to separate fluorine from fluorine-containing wastewater.
- fluorine is fluorinated.
- the recovery efficiency of fluorine increases by collecting as calcium fluoride-containing sludge, the content of calcium fluoride in the sludge is low. This is because the sludge contains a contaminated calcium salt generated by a reaction between a contaminated ion other than fluorine ions and a calcium compound. It is generally known that calcium compounds have low solubility.
- an object of the present invention is to provide a fluorine-containing wastewater treatment method and a fluorine-containing wastewater treatment facility capable of recovering sludge having a high commercial value suitable for recycling of fluorine having a high fluorine compound content. It is to provide.
- the first characteristic configuration of the present invention is an addition step of generating magnesium fluoride by adding a magnesium compound to fluorine-containing wastewater that is heated to maintain the liquid temperature at a predetermined temperature. And a flocculating and separating step of flocculating and separating the magnesium fluoride produced by the adding step and collecting the fluorinated magnesium sludge by a coagulant adding step.
- sludge having a high content of magnesium fluoride can be obtained even in the presence of impurity ions by adding a magnesium compound to fluorine-containing water containing impurity ions other than fluorine ions. Can be obtained.
- the reason why sludge having a high magnesium fluoride content is obtained is that the solubility of magnesium fluoride is / J, compared to the solubility of magnesium salt with other impurities.
- Example 2 In a comparative example of Example 1 described later, when a magnesium compound is added to a fluorine-containing wastewater in which a plurality of impurity ions are present, and when a calcium compound is added Investigate the ratio of fluorine compounds contained in each sludge. As a result, it was found that the percentage of fluorine compound contained in the generated sludge was higher when the magnesium compound was added (97.6%) than when the calcium compound was used (80% or less). (See Table 2).
- Example 2 the residual fluorine concentration and the fluorine recovery rate when the temperature conditions of the fluorine-containing wastewater when adding the magnesium compound were variously changed were examined.
- the reaction temperature by heating the fluorine-containing wastewater, the residual fluorine concentration remaining in the solution after the recovery of magnesium fluoride sludge can be reduced and the recovery rate of fluorine can be improved. (See Figures 6-7). Therefore, it is possible to secure a stable recovery rate against fluctuations in the load of fluorine-containing wastewater that is raw water.
- the magnesium fluoride sludge can be efficiently precipitated. Therefore, it is possible to easily collect magnesium fluoride sludge.
- a second characteristic configuration of the present invention is a method for treating fluorine-containing wastewater, wherein a magnesium compound is added to the fluorine-containing wastewater that is heated to maintain the liquid temperature at a predetermined temperature to generate magnesium fluoride. There is an addition step and a centrifugation step of centrifuging the magnesium fluoride produced in the addition step and recovering it as magnesium fluoride sludge.
- the addition step includes adding a magnesium compound to fluorine-containing water containing impurity ions other than fluorine ions, as in the first characteristic configuration. Even in the presence, sludge with a high magnesium fluoride content can be obtained.
- the magnesium fluoride produced by adding the magnesium compound is centrifuged. By performing the centrifugal separation process, it can be quickly recovered as magnesium fluoride sludge using centrifugal force.
- a third characteristic configuration of the present invention is a method for treating fluorine-containing wastewater, wherein the recovered magnesium fluoride sludge is dehydrated and dried, and the magnesium fluoride sludge dried by the drying step is purified. And a purification step for recovering magnesium fluoride.
- sludge having a high magnesium fluoride content can be dehydrated and dried, and further purified to recover the magnesium fluoride.
- a recycling method capable of recovering magnesium halide can be provided.
- a fourth characteristic configuration of the present invention is that the method for treating fluorine-containing wastewater has a residual fluorine removal step of removing residual fluorine from the treated wastewater from which the fluorine fluoride sludge has been recovered.
- the treated wastewater can be made wastewater having almost no residual ions by performing the treatment for removing the residual fluorine.
- a fifth characteristic configuration of the present invention is that, in the fluorine-containing wastewater treatment method, the residual fluorine removal step performs a residual fluorine removal treatment with an ion exchange resin.
- Example 3 as a result of performing the residual fluorine removal step using the ion exchange resin, the residual fluorine concentration is reduced to about 3 mg / L compared to the fluorine concentration before passing through the resin. It turned out to be possible.
- a sixth characteristic configuration of the present invention is that, in the method for treating fluorine-containing wastewater, the ion exchange resin is an anion ion exchange resin or a chelate resin.
- a seventh characteristic configuration of the present invention is the process for adding fluorine in a method for treating fluorine-containing wastewater.
- the temperature of the fluorine-containing wastewater is from 30 to 100 ° C.
- Example 2 the residual fluorine concentration and the fluorine recovery rate when the temperature conditions of the fluorine-containing wastewater when adding the magnesium compound were variously changed were examined. As a result, it was found that a fluorine recovery rate of 60% or higher was expected at a reaction temperature of 30 ° C or higher, and a fluorine recovery rate of 80% or higher was expected at a reaction temperature of 80 to 100 ° C (Fig. 6 ⁇ 7).
- An eighth characteristic configuration of the present invention is that in the method for treating fluorine-containing wastewater, the temperature of the fluorine-containing wastewater is higher than 60 ° C.
- Example 2 the residual fluorine concentration and the fluorine recovery rate when the temperature conditions of the fluorine-containing wastewater when the magnesium compound was added were varied. As a result, at a reaction temperature of 60 ° C or higher, it was possible to secure a fluorine recovery rate of 75% or higher (see Figure 7). Therefore, according to the eighth characteristic configuration, it is possible to reduce the load on the subsequent process for treating residual fluorine.
- a ninth characteristic configuration of the present invention is that, in the method for treating fluorine-containing wastewater, the amount of magnesium compound added to the fluorine in the fluorine-containing wastewater in the adding step is 0.5 to 2 molar equivalents.
- Example 1 the relationship between the amount of added magnesium compound (magnesium sulfate) and the fluorine recovery rate was examined.
- the addition amount of magnesium sulfate is required to be 0.5 molar equivalents or more. Even if the addition amount is 2.0 molar equivalents or more, the residual fluorine ion concentration is 200 mg / It was found that there was no drop below L (see Figure 3). In other words, the recovery rate of magnesium fluoride does not improve because the solubility of magnesium fluoride is saturated, and when 2.0 molar equivalents are exceeded, the magnesium compound does not participate in the formation of free magnesium.
- a tenth characteristic configuration of the present invention is that, in the method for treating fluorine-containing wastewater, the pH value of the fluorine-containing wastewater in the adding step is 3 to 8.5.
- Example 1 the relationship between the pH value of the reaction solution and the fluorine recovery rate was examined.
- An eleventh characteristic configuration of the present invention is that in the method for treating fluorine-containing wastewater, the pH value of the fluorine-containing wastewater is 5-7.
- the eleventh characteristic configuration by setting the pH value of the fluorine-containing wastewater in the addition step to 5 to 7, the commercial value is higher and the magnesium fluoride content is 96% or more. Magnesium fluoride sludge can be obtained.
- a twelfth characteristic configuration of the present invention is that, in the method for treating fluorine-containing wastewater, when the fluorine-containing wastewater contains silicate ions, the pH value is 3-7.
- magnesium silicate does not precipitate when the pH value is in the range of 3-7. Therefore, the above According to the twelfth feature configuration, since the magnesium fluoride content in the magnesium fluoride sludge is not reduced, it is possible to obtain a magnesium fluoride sludge having a high magnesium fluoride content.
- a thirteenth feature of the present invention is that, when the fluorine-containing wastewater contains at least one of phosphate ions and sulfite ions, the phosphate is added by an ion exchange membrane before the addition step. An ion exchange membrane treatment process for separating and removing ions or sulfite ions is performed.
- phosphate ion or sulfite ion When at least one of phosphate ion or sulfite ion is contained in the raw water, if a magnesium compound is added, the hardly soluble phosphate compound or sulfite compound is reduced. In order to prevent this, phosphate ions or sulfite ions are separated and removed in advance by an ion exchange membrane.
- a phosphoric acid compound or a sulfite compound is not mixed in the magnesium fluoride sludge, and the content of magnesium fluoride is high and sludge can be obtained.
- the fourteenth feature of the present invention is that in the method for treating fluorine-containing wastewater, when the fluorine-containing wastewater contains sulfite ions, an oxidation for oxidizing the sulfite ions to sulfate ions before the adding step. The point is to perform the process.
- magnesium sulfite is not mixed in the magnesium fluoride sludge, and the magnesium fluoride content is high and sludge can be obtained.
- a fifteenth feature of the present invention is the method for treating fluorine-containing wastewater, wherein Before the process, a concentration step of concentrating the fluorine-containing wastewater is performed.
- the fluorine recovery can be improved by concentrating the raw water in advance.
- the sixteenth characteristic configuration of the present invention is selected from the group consisting of magnesium compound power magnesium sulfate, magnesium chloride, magnesium oxide, magnesium hydroxide, and magnesium carbonate in the method for treating fluorine-containing wastewater. In the point.
- the magnesium compound described in the sixteenth characteristic configuration can be preferably used from the viewpoint of recovery rate and economy.
- magnesium sulfate when magnesium sulfate is used, even if a large amount of sulfate ion is present in the fluorine-containing wastewater, a precipitate product is not formed due to the high solubility of magnesium sulfate. Therefore, magnesium sulfate is not mixed in the magnesium fluoride sludge, and a sludge containing high-purity magnesium fluoride can be obtained.
- the seventeenth characteristic configuration of the present invention is a fluorine-containing wastewater treatment facility for treating fluorine-containing wastewater to produce a fluorine compound, heating means for heating the fluorine-containing wastewater, and the fluorine-containing wastewater.
- a temperature maintaining means for maintaining the liquid temperature at a predetermined temperature, an aggregating part for aggregating the fluorine compound, and a precipitation separating part for precipitating and separating the aggregated fluorine compound.
- the temperature of the fluorine-containing wastewater is raised by heating with the heating means, and the temperature rise state can be maintained with the heat retaining means.
- a recycling system that can reduce the fluorine concentration and improve the fluorine recovery rate can be provided.
- the fluorine compound can be aggregated / precipitated with a flocculant by having an aggregation part that aggregates the fluorine compound and a precipitation separation part that precipitates and separates the aggregated fluorine compound, the fluorine compound It becomes a recycling system that can be easily collected.
- the eighteenth characteristic configuration of the present invention is a fluorine-containing wastewater treatment facility for treating fluorine-containing wastewater to produce a fluorine compound, heating means for heating the fluorine-containing wastewater, and the fluorine-containing wastewater The liquid temperature is maintained at a predetermined temperature, and a centrifuge for centrifuging the fluorine compound is provided.
- the temperature of the fluorine-containing wastewater is raised by heating with the heating means, and the temperature rise state can be maintained with the heat retaining means, so that the residual remaining in the solution after the recovery of the fluorine compound
- a recycling system that can reduce the fluorine concentration and improve the fluorine recovery rate can be provided.
- the recycling system can quickly collect the fluorine compound by using the centrifugal force.
- a magnesium compound is added to fluorine-containing wastewater that is heated to maintain the liquid temperature at a predetermined temperature to generate magnesium fluoride.
- a flocculation separation step (B_1) is performed in which the magnesium fluoride produced in the addition step (A) is flocculated and separated by adding a flocculant and recovered as magnesium fluoride sludge.
- a centrifugation step (B — 2) in which the magnesium fluoride produced in the additive step (A) is centrifuged and recovered as magnesium fluoride sludge.
- a drying step (C) in which the recovered magnesium fluoride sludge is dehydrated and dried, and a purification step (D) in which the dried soot magnesium sludge is purified to recover magnesium fluoride are performed.
- a residual fluorine removal step (E) is performed to remove residual fluorine from the treated wastewater from which the magnesium fluoride sludge has been recovered.
- magnesium fluoride sludge refers to sludge containing magnesium fluoride.
- magnesium is added to the fluorine-containing wastewater that has been heated to maintain the liquid temperature at a predetermined temperature.
- the process which adds a shim compound is performed.
- the fluorine-containing wastewater is, for example, wastewater containing fluorine ions discharged from a semiconductor's liquid crystal manufacturing plant, a fluorine compound manufacturing plant, a bulb manufacturing plant, a steel plate manufacturing plant, a stainless steel pickling plant, a fertilizer plant, etc. is there.
- FIG. 2 shows an overview of the treatment facility X for fluorine-containing wastewater.
- the raw fluorine-containing wastewater is heated by the heating means 3a (heat treatment), and then the liquid temperature of the fluorine-containing wastewater that has been calorically heated is maintained at a predetermined temperature (heat-retaining treatment) by the heat-retaining means 3b.
- the heating means 3a and the heat retaining means 3b may be separate devices or integrated devices. In the case of the latter device, it can be preferably used because the installation space of the device can be saved. For example, a water bath that can heat and keep the solution can be used, but is not limited thereto.
- the liquid temperature of the fluorine-containing wastewater is 30 to 100 ° C, and this liquid temperature is maintained. Preferably, the liquid temperature is higher than 60 ° C.
- the fluorine-containing waste water that has been heated and kept warm is introduced into the reaction tank 1 through the introduction pipe la.
- Reactor 1 is equipped with a stirrer 5a and a pH sensor (not shown). While maintaining a predetermined pH value by introducing a pH adjuster, the magnesium compound is added to the fluorine contained in the fluorine-containing wastewater. Add 5 to 2 mono equivalents, preferably 1.0 to 1.5 molar equivalents. Then, the magnesium fluoride is produced by gently stirring with the stirrer 5a.
- the magnesium compound can be selected from the group consisting of magnesium sulfate, magnesium chloride, magnesium oxide, magnesium hydroxide, and magnesium carbonate from the viewpoint of recovery rate and economy, but is not limited thereto.
- magnesium sulfate can be most preferably used from the viewpoint of fluorine recovery and economy. In this case, even if a large amount of sulfate ion is present in the fluorine-containing wastewater, the precipitation product is not formed due to the high solubility of magnesium sulfate. Magnesium sulfate is not mixed in the magnesium fluoride sludge, and it is possible to obtain sludge containing high-purity magnesium fluoride.
- pH adjuster for example, hydrochloric acid 'sulfuric acid or the like can be used as an acid adjuster, and sodium hydroxide or potassium hydroxide can be used as an alkali adjuster.
- sodium hydroxide or potassium hydroxide can be used as an alkali adjuster.
- sparingly soluble calcium salt The calcium hydroxide produced cannot be used.
- the introduction pipe la is provided with a fluorine monitor 6 equipped with an ion electrode, and the amount of magnesium compound added is adjusted based on the monitored fluorine concentration.
- the fluorine monitor 6 is performed by, for example, an online fluorine monitor, an electric conductivity meter, or the like.
- an aggregation separation step and a centrifugation step can be applied. Each step will be described below.
- a flocculant is added and the magnesium fluoride produced in the addition step (A) is agglomerated and separated to recover magnesium fluoride sludge (see Fig. 2).
- inorganic flocculants such as PAC (polyaluminum chloride), sulfuric acid sulfate (aluminum sulfate), salted pig iron, and iron sulfate, or organic polymer flocculants such as acrylamide type can be applied.
- This flocculant is added to the agglomeration tank 2a, which is an agglomeration part, and is gently agitated with the agitator 5b to agglomerate and increase the particle size, resulting in precipitated magnesium fluoride.
- the fluorine-containing wastewater to which the flocculant is added is introduced into the precipitation tank 2b, which is a precipitation separation unit, and magnesium fluoride is precipitated by gravity to produce magnesium fluoride sludge.
- the precipitated magnesium fluoride sludge is collected and used for the drying process.
- the magnesium fluoride produced in the adding step (A) is centrifuged and recovered as magnesium fluoride sludge (not shown).
- Centrifugation is a technique that separates the target substance according to the difference in specific gravity by centrifugal force.
- a centrifuge such as a known centrifuge can be used.
- sedimentation components such as magnesium fluoride produced by adding a magnesium compound to fluorine-containing wastewater can be recovered as magnesium fluoride sludge by centrifugal force.
- the magnesium fluoride sludge thus precipitated is collected and used for the drying process.
- the recovered magnesium fluoride sludge is washed with washing water and then dehydrated. Dehydrate with machine 4 etc. and dry with dryer 5. The dried magnesium fluoride sludge becomes sludge containing magnesium fluoride with high purity.
- the dehydrator 4 and the dryer 5 are not limited as long as the magnesium fluoride sludge can be dehydrated or dried.
- a known device such as a rotary kiln capable of adjusting the temperature can be applied.
- Any apparatus that can perform both dehydration and drying treatments can be used preferably because the installation space of the apparatus can be omitted.
- Washed water that has been washed with magnesium fluoride sludge may be added to the fluorine-containing wastewater before being heated or kept warm by performing known appropriate treatments.
- the magnesium fluoride sludge dried in the drying step is purified to recover the wheat salt magnesium.
- the sludge is purified according to a known method such as washing with water.
- the magnesium fluoride sludge is separated and recovered in the separation step (B), and the fluorine remaining in the supernatant liquid (treated wastewater) is removed.
- the residual fluorine is removed by the ion exchange resin 7.
- the ion exchange resin 7 is preferably an anion ion exchange resin or a chelate resin, but is not limited thereto. Any resin can be used as the anion-based ion exchange resin and the chelate resin as long as they have a function of selectively capturing fluorine ions.
- the phosphate ion or sulfite ion is added by an ion exchange membrane before the addition step (A).
- An ion exchange membrane treatment step (F) for separating and removing sulfate ions is performed.
- a raw material water contains at least one of phosphate ion or sulfite ion and a magnesium compound is added, the hardly soluble phosphate compound or sulfite compound decreases.
- phosphate ions or sulfite ions are separated and removed in advance by an ion exchange membrane.
- An ion exchange membrane is a membrane that selectively separates various ions, which are electrolytes in a solution, using electrical energy and concentration differences.
- phosphate ions or sulfite ions can be selectively separated. If applicable.
- “Ceremion (registered trademark) J” manufactured by Asahi Glass Co., Ltd. is preferably exemplified.
- an oxidation step (G) for oxidizing the sulfite ions to sulfate ions is performed before the addition step (A).
- sulfite ions are oxidized to sulfate ions by an oxidizing agent, ultraviolet rays or ozone, or a combination of two or more of them before the additive step (A).
- an oxidizing agent ultraviolet rays or ozone, or a combination of two or more of them
- This can prevent the formation of poorly soluble magnesium sulfite in the addition step (A).
- magnesium sulfite is not mixed in the magnesium fluoride sludge, and the content of magnesium fluoride is high and sludge can be obtained.
- a concentration step of concentrating the raw fluorine-containing wastewater is performed prior to the addition step (A).
- Methods for concentrating raw water include ion exchange, reverse osmosis, electrodialysis, and vacuum distillation.
- the phosphorus removal step, the oxidation step, and the concentration step described above can be used alone or in appropriate combination as a pretreatment for the addition step.
- the magnesium fluoride sludge having a high magnesium fluoride content obtained through the above steps can be used as a material for manufacturing an optical element of magnesium fluoride having excellent optical characteristics.
- Fluoride single crystals have excellent optical characteristics in the ultraviolet region and are indispensable as optical elements such as steppers.
- magnesium fluoride is widely used as a low-reflective coating material for lenses of general optical equipment glasses because of its low surface reflectance.
- High purity hydrogen fluoride gas can be obtained by reacting with hot concentrated sulfuric acid in equipment such as a rotary kiln. Therefore, the method for treating fluorine-containing wastewater of the present invention can recover sludge with a high commercial value suitable for fluorine recycling.
- the liquid waste in the liquid crystal factory ( ⁇ . 8) was used as the fluorine-containing waste water, the amount of magnesium compound added as an additive, and the pH conditions of the reaction liquid after addition of the magnesium compound were examined.
- the composition of the fluorine-containing wastewater obtained as a result of component analysis is shown in Table 1.
- this fluorine-containing wastewater contains chloride ions, sulfate ions, sulfite ions, silicate ions, and the like in addition to fluoride ions.
- Magnesium sulfate was used as the magnesium compound. Added Caro amount of magnesium sulfate and 0.3 to 2 molar equivalents relative to fluorine contained in the fluorine-containing waste water, the P H value of the reaction solution was changed from 2 to 9. The reaction was performed by reacting at room temperature for 1 hour.
- Figure 3 shows the changes.
- fluorine can be recovered by setting the magnesium sulfate to 1.0 to 1.5 molar equivalents of fluorine in the fluorine-containing wastewater.
- FIG. 5 shows the magnesium fluoride content in sludge produced at pH values of 3-9. From Fig. 5, a magnesium fluoride sludge having a magnesium fluoride content of 85% or more was obtained at a pH value of 8.5 or less. Since the solubility of contaminating ions changes depending on the pH value, when the pH value exceeds 8.5, contaminated salt was mixed in the sludge, and the content of magnesium fluoride contained in the sludge decreased.
- the ratio of the fluorine compound contained in each generated sludge (magnesium fluoride, calcium carbonate) when the calcium compound was added was examined.
- the waste liquid in the liquid crystal factory was used as the fluorine-containing waste water, and the temperature conditions of the fluorine-containing waste water when adding the magnesium compound as an additive were examined.
- fluorine-containing wastewater Sample 1 containing various ions at a high concentration and Sample 2 having various ions at a lower concentration than Sample 1 were used.
- Table 3 shows the composition (mg / L) of various ions in fluorine-containing wastewater.
- Magnesium sulfate was used as the magnesium compound.
- the amount of magnesium sulfate added is 1.0 molar equivalent to the fluorine contained in the fluorine-containing wastewater, the pH value of the reaction solution is 6, the reaction time is 1 hour, and the fluorine when adding magnesium sulfate is added.
- the reaction temperature of the contained wastewater was changed from 5 to 80 ° C. The liquid temperature during the reaction was maintained after reaching the desired temperature.
- Figure 6 shows the results of examining changes in the residual fluorine concentration in the treated wastewater after recovery of magnesium fluoride sludge produced by magnesium sulfate-added waste water, while changing the reaction temperature of the fluorine-containing wastewater.
- Fig. 7 shows the fluorine recovery rate.
- reaction temperature it is possible to reduce the residual fluorine concentration and improve the recovery rate.
- a residual fluorine removal step was performed in which residual fluorine was removed from the treated wastewater from which the magnesium fluoride sludge was collected using an ion exchange resin.
- an ion exchange resin a chelate resin (Eboras K-1 (manufactured by Miyoshi Oil & Fats Co., Ltd.)) was used.
- Treated wastewater composition (mg / L) Table 4 shows.
- Fig. 8 shows the results of investigating the outflow fluorine concentration with respect to the flow rate of the chelate resin.
- the effluent fluorine concentration was about 3 mg / L up to 60 times the amount of resin. Therefore, under this condition, 15 minutes compared to the fluorine concentration (46 mg / L) before passing through the resin. 1 or less.
- the fluorine-containing wastewater treatment method and the fluorine-containing wastewater treatment facility of the present invention include, in particular, a semiconductor / liquid crystal production factory, a fluorine compound production factory, a bulb production factory, a steel sheet production factory, a stainless pickling factory, and a fertilizer factory. It can be used for the treatment method of fluorine-containing wastewater and the treatment equipment of fluorine-containing wastewater.
- FIG. 1 Schematic diagram of the process for treating fluorine-containing wastewater of the present invention
- FIG. 2 System schematic diagram of the method for treating fluorine-containing wastewater of the present invention
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JP2024016933A (ja) * | 2022-07-27 | 2024-02-08 | 日本エイアンドエル株式会社 | 汚泥処理方法 |
CN115925080A (zh) * | 2022-11-23 | 2023-04-07 | 江西理工大学 | 一种钨冶炼废水的处理方法 |
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