CN109502717B - SiO-containing material2Acid wastewater treatment method - Google Patents

SiO-containing material2Acid wastewater treatment method Download PDF

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Publication number
CN109502717B
CN109502717B CN201811365335.8A CN201811365335A CN109502717B CN 109502717 B CN109502717 B CN 109502717B CN 201811365335 A CN201811365335 A CN 201811365335A CN 109502717 B CN109502717 B CN 109502717B
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sio
acid wastewater
tank
wastewater
acid
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CN109502717A (en
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唐军刚
钟贻富
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Pangang Group Xichang Steel and Vanadium Co Ltd
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Pangang Group Xichang Steel and Vanadium Co Ltd
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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
    • 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
    • C02F1/52—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
    • C02F1/66—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
    • C02F2101/12—Halogens or halogen-containing compounds
    • 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
    • C02F2101/20—Heavy metals or heavy metal compounds
    • 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
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
    • 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
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH

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  • 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

The invention provides a SiO-containing material2The method for treating acid wastewater, comprising: will contain SiO2Adjusting the pH of the acid wastewater to obtain a treated substance; mixing the treated substance with polyaluminium chloride to obtain a concrete; mixing the concrete and polyacrylamide to obtain a flocculating constituent; and clarifying the flocculating constituent after pH adjustment to obtain precipitate and liquid. The method provided by the invention adopts the process of 'neutralization, flocculation and separation' to treat SiO-containing materials2The acid wastewater is treated. The invention is directed to SiO-containing compositions of particular composition2The acid wastewater is sequentially treated by polyaluminium chloride and polyacrylamide, and the treating agent with specific components can treat the acid wastewater containing SiO2The acid wastewater is well treated, and a good treatment effect is obtained.

Description

SiO-containing material2Acid wastewater treatment method
Technical Field
The invention relates to the technical field of acid wastewater treatment, in particular to a method for treating wastewater containing SiO2The acid wastewater treatment method of (1).
Background
In the acid rolling production line of a certain large-scale steel and iron combination enterprise in Panxi, the electric steel is produced by adjusting and optimizing the product structure, the cold-rolled electric steel needs to be subjected to cold rolling after an acid washing process, and acid-containing waste liquid after acid washing is treated by a cold-rolling waste water treatment system. Long-term production of electrical steel, steel grade containing large amount of Si and SiO2The components are dissolved in the acid liquor to cause serious blockage of the pickling process and the acid regeneration treatment device pipeline and system, and the acid rolling process is forced to stop to treat the blocked pipeline. The prior art does not treat Si and SiO for treating cold rolling wastewater, namely acid-containing wastewater2The capability of the method is that the method adopts the processes of repeated beating circulation and continuous addition of industrial alkali, quicklime and the like in the treatment process, and can not treat the silicon and SiO contained completely2The main line production is stopped due to the acid-containing wastewater.
After vanadium titano-magnetite is smelted and processed into hot-rolled plate strip steel, namely electrical steel, a large amount of Si and SiO contained steel is generated in the subsequent acid rolling and pickling processes2To form a SiO-containing product2The acid wastewater. The wastewater treatment station in the prior art adopts a common acid-base comprehensive process to treat wastewater, and cannot treat acid-base mixed liquor and SiO-containing mixed liquor2Acid waste water ofEffective separation is carried out, and the prior art is difficult to realize the SiO-containing2The acid wastewater is effectively treated, thereby causing serious environmental protection accidents. Therefore, there is a great need for an effective treatment of such SiO-containing materials2The acid wastewater treatment process.
Disclosure of Invention
In view of the above, the present invention is to provide a SiO-containing material2The method provided by the invention can better treat the SiO-containing wastewater2The acid wastewater.
The invention provides a SiO-containing material2The method for treating acid wastewater, comprising:
will contain SiO2Adjusting the pH of the acid wastewater to obtain a treated substance;
mixing the treated substance with polyaluminium chloride to obtain a concrete;
mixing the concrete and polyacrylamide to obtain a flocculating constituent;
and clarifying the flocculating constituent after pH adjustment to obtain precipitate and liquid.
In the present invention, the SiO-containing2The acid wastewater comprises:
SiO2si, Fe, HCl, ferric chloride and heavy metal ions.
In the present invention, the SiO2In the presence of SiO2The mass content of the acid wastewater is preferably 3000-4000 mg/L, more preferably 3200-3800 mg/L, most preferably 3400-3600 mg/L, and most preferably 3400 mg/L.
In the present invention, the Si is in SiO-containing2The mass content of the acid wastewater is preferably 600-1000 mg/L, more preferably 700-900 mg/L, and most preferably 800 mg/L.
In the invention, the Fe is in SiO-containing2The mass content of the acid wastewater is preferably 300-500 mg/L, more preferably 350-450 mg/L, and most preferably 400 mg/L.
In the present invention, the HCl is in SiO-containing solution2The mass content of the acid wastewater is preferably 80-120 mg/L, more preferably 90-110 mg/L, and most preferably 100 mg/L.
In bookIn the invention, the ferric chloride contains SiO2The mass content of the acid wastewater is preferably 80-120 mg/L, more preferably 90-110 mg/L, and most preferably 100 mg/L.
In the present invention, the heavy metal ions are in SiO-containing form2The mass content of the acid wastewater is preferably 0.8-1.2 mg/L, more preferably 0.9-1.1 mg/L, and most preferably 1 mg/L.
The invention is to contain SiO2Before the pH adjustment of the acid wastewater containing SiO is carried out, the SiO is preferably added2The acid wastewater is stirred, so that large-particle pollutants in the acid wastewater are prevented from being precipitated at the bottom of the wastewater. In the present invention, the stirring time is preferably 2 to 3 hours, more preferably 2.2 to 2.8 hours, and most preferably 2.4 to 2.6 hours. In the present invention, the SiO-containing compound may be2The acid wastewater is stirred in an acid wastewater adjusting tank. In the present invention, the stirring method is preferably stirring by introducing compressed air.
In the present invention, the SiO is contained2The reagent for adjusting the pH of the acid wastewater is preferably an alkaline reagent, and more preferably lime milk. In the present invention, the pH value of the treated product obtained after the pH adjustment is preferably 8 to 9, more preferably 8.2 to 8.8, and most preferably 8.4 to 8.6. In the present invention, the SiO is contained2The amount of the alkaline agent for adjusting the pH of the waste acid water is preferably such that the pH of the treated product is 8 to 9. The invention preferably pumps the lime milk to the SiO-containing2The pH value of the acid wastewater is adjusted to 8-9 in the adjusting tank.
The invention can utilize the common acid wastewater treatment process equipment to directly add lime milk into the acid wastewater adjusting tank to contain SiO under the condition of not modifying any process unit2The pH value of the acid wastewater is adjusted to 8-9, and lime milk and SiO are added2Formation of CaSiO3And precipitating to enable the removal rate of silicon to reach 80%.
In the present invention, after the treated product is obtained, the treated product is treated with polyaluminum chloride as a coagulant to obtain a concrete. In the present invention, the mixing of the treated product and the polyaluminum chloride is preferably carried out under stirring, and the stirring is preferably carried out by introducing compressed air.
SiO-containing compositions for specific compositions of the invention2Compared with other agents with coagulation effect such as ferric hydroxide, ferric trichloride and sodium aluminate, the acid wastewater containing SiO with the special component can be treated by the polyaluminium chloride2The acid wastewater has better coagulation effect.
In the invention, polyaluminium chloride is preferably added into the regulating tank to be used as a coagulant. In the present invention, the polyaluminum chloride and SiO-containing compound2The mass ratio of the acid wastewater is preferably (5-15): 100, more preferably (8-12): 100, most preferably 10: 100. The polyaluminium chloride with the dosage proportion is preferably adopted in the invention, and the polyaluminium chloride with the specific dosage proportion can obtain better coagulation effect.
In the invention, after the concrete is obtained, the invention adopts polyacrylamide as a flocculating agent to carry out flocculation treatment on the concrete. In the present invention, the mixing of the concrete and the polyacrylamide is preferably performed under stirring conditions, and the stirring method is preferably performed by introducing compressed air.
According to the invention, polyacrylamide is preferably added into the regulating reservoir as a flocculating agent. In the present invention, the polyacrylamide and SiO-containing2The mass ratio of the acid wastewater is preferably (0.5-1.5): 1000, more preferably (0.8 to 1.2): 1000, most preferably 1: 1000. The invention preferably adopts the polyacrylamide with the dosage range for flocculation treatment, and the invention can obtain good flocculation effect by adopting the flocculant with the specific dosage range.
After the treated product is obtained, adding polyaluminium chloride as a coagulant, then adding polyacrylamide as a flocculant, and fully utilizing compressed air in a regulating tank to stir so as to ensure that aluminum salt and SiO-containing gas are mixed2The acid wastewater is contacted, so that a large amount of silicon is absorbed and removed.
The invention observes the volume of the floe after it has been obtained, which is preferably coarsely dense and completely settled within 30 seconds.
In the present invention, the agent for adjusting the pH of the flocs is preferably an alkaline agent, and more preferably lime milk. In the invention, the pH value is preferably adjusted to 8-9, more preferably 8.2-8.8, and most preferably 8.4-8.6. In the invention, the pH value of a product obtained by adjusting the pH of the flocculating constituent is preferably within the range of 8-9 by 100%.
In the present invention, after obtaining the flocs, the present invention preferably stirs the flocs to better polymerize the flocs to produce more flocs with larger lumps; the stirring method is preferably stirrer stirring. The invention preferably utilizes a neutralization tank agitator to agitate the flocculent.
After the pH value of the flocculating constituent is adjusted, the invention preferably clarifies the obtained product, and separates the liquid and the sediment in the product. According to the invention, the lift pump of the adjusting tank is preferably started, the product obtained after the pH of the flocculating constituent is adjusted is conveyed to the acid neutralization tank, and then the product flows into the clarification tank, so that the precipitate (colloidal silica) in the clarification tank is separated from the liquid.
The invention preferably separates the sediment from the liquid, and carries out the subsequent treatment on the sediment, and more preferably, the sediment at the bottom of the clarification tank is conveyed to the concentration tank through a sludge discharge pump for the subsequent treatment.
After a great deal of exploration and experiments of the inventor, the invention obtains an effective physical and chemical combined treatment method for SiO-containing substances2The acid wastewater is effectively separated and treated, and the environmental pollution is reduced. The method provided by the invention adopts the process of 'neutralization, flocculation and separation' to treat SiO-containing materials2The acid wastewater is treated. The invention aims at the problem that the acid wastewater with special components is sequentially treated by polyaluminium chloride and polyacrylamide, and the treating agent with special components can be used for treating the acid wastewater containing SiO2The acid wastewater is well treated, and a good treatment effect is obtained. Compared with other treatment processes such as coagulation desilication, reverse osmosis desilication, ultrafiltration desilication, air floatation desilication, electrocoagulation desilication and the like, the method provided by the invention has good treatment effect and less investment.
The invention providesThe supplied wastewater treatment process is suitable for environment-friendly treatment of acid-containing wastewater generated after acid washing of the plate strip electrical steel after the vanadium titano-magnetite smelting and processing. The invention additionally treats SiO in the common acid-containing wastewater treatment process2The process for treating the acidic wastewater mainly comprises the steps of sending compressed air into a regulating tank for stirring to prevent large-particle pollutants from precipitating, sending the compressed air into a neutralizing tank through a lifting pump of the regulating tank for the acidic wastewater, adding lime milk into the neutralizing tank to regulate the pH value, aerating, and adding Fe in the wastewater2+Conversion to Fe3+. The effluent of the neutralization tank automatically flows to a reaction clarification tank for sludge-water separation. The invention can utilize the original common acid-containing wastewater treatment process equipment to carry out treatment without investment and reconstruction of new process equipment.
The invention provides a method for preparing SiO-containing2The acid wastewater treatment method does not need to adopt a newly-built storage device, directly utilizes the polluted water pool as an emergency pool, does not need to transport and separately establish the storage device, and reduces the investment and the operation cost; once water pollution is found, the on-line equipment is immediately stopped, secondary pollution is not carried out on a normal system, and the operation cost is reduced; the field device for water quality treatment and medicament addition does not need to be additionally provided with equipment independently, so that the investment of fixed materials is reduced; the auxiliary adding and adjusting device can utilize the original equipment of the system, so that the investment is reduced; the treated polluted acid-containing wastewater completely meets the environmental protection and design specifications.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
SiO-containing of the following examples of the invention2The acid wastewater contains:
3400mg/L of SiO2(ii) a 800mg/L of Si; 400mg/L Fe; 100mg/L HCl; ferric chloride; 1mg/L of heavy metal ions.
Example 1
Will contain SiO2The acid wastewater enters an acid wastewater adjusting tank and compressed air is introduced into the acid wastewater adjusting tank to stir for 2.5 hours;
pumping lime milk into the acid wastewater adjusting tank for pH adjustment, and adjusting the pH to 8.5 to obtain a treated substance;
adding a polyaluminium trichloride coagulant into the acid wastewater regulating tank, and stirring under the condition of compressed air to ensure that the coagulant and the SiO-containing coagulant are mixed2The mass ratio of the acid wastewater to the acid wastewater is 10:100, and a concrete is obtained;
adding polyacrylamide flocculant into the acid wastewater regulating tank, and stirring under the condition of compressed air to ensure that the flocculant and SiO-containing water are mixed2The mass ratio of the acid wastewater is 1:1000, and a flocculating constituent is obtained;
adding lime milk into the acidic wastewater regulating tank to regulate the pH value, so that the pH value of all substances in the acidic wastewater regulating tank reaches 8.5;
sampling and observing the size of a flocculating body, wherein the flocculating body is thick, compact and completely precipitated within 30 seconds;
starting a regulating reservoir lift pump, conveying the substances in the acidic wastewater regulating reservoir to a neutralization tank, stirring by using a neutralization tank stirrer, and then allowing the substances to flow into a clarification tank for clarification to separate colloidal silica (sediment) from liquid;
and conveying the colloidal silica precipitated at the bottom of the clarification tank to a concentration tank through a sludge discharge pump, and performing subsequent process treatment.
The liquid obtained in example 1 of the present invention was examined as follows:
measuring the pH value by adopting a glass electrode method; measuring the conductivity by a static method; COD by potassium dichromate methodCrMeasuring; SiO measurement by adopting silicon-molybdenum blue colorimetric method2And (4) content.
Determination of the suspended matter (SS):
and (3) after the water sample passes through the filter material, drying the solid residue and the filter material, and subtracting the weight of the filter material from the weighed weight to obtain suspended solid (non-filtering residue).
The results are shown in table 1:
TABLE 1 liquid index obtained by the treatment method provided in example 1 of the present invention
Figure 359840DEST_PATH_IMAGE001
From the above-mentioned detection results, it can be seen that the method provided in example 1 of the present invention can be applied to SiO-containing materials2The acid waste liquid is well treated.
Example 2
Will contain SiO2The acid wastewater enters an acid wastewater adjusting tank and compressed air is introduced into the acid wastewater adjusting tank to stir for 2 hours;
pumping lime milk into the acid wastewater adjusting tank for pH adjustment, and adjusting the pH to 8 to obtain a treated substance;
adding a polyaluminium trichloride coagulant into the acid wastewater regulating tank, and stirring under the condition of compressed air to ensure that the coagulant and the SiO-containing coagulant are mixed2The mass ratio of the acid wastewater to the acid wastewater is 8:100, and a concrete is obtained;
adding polyacrylamide flocculant into the acidic wastewater regulating tank, and stirring under the condition of compressed air to make the flocculant and SiO-containing water2The mass ratio of the acid wastewater is 0.8:1000, and a flocculating constituent is obtained;
adding lime milk into the acidic wastewater regulating tank to regulate the pH value, so that the pH value of all substances in the acidic wastewater regulating tank reaches 8;
sampling and observing the size of a flocculating body, wherein the flocculating body is thick, compact and completely precipitated within 30 seconds;
starting a regulating reservoir lift pump, conveying the substances in the acidic wastewater regulating reservoir to a neutralization tank, stirring by using a neutralization tank stirrer, and then allowing the substances to flow into a clarification tank for clarification to separate colloidal silica (sediment) from liquid;
and conveying the colloidal silica precipitated at the bottom of the clarification tank to a concentration tank through a sludge discharge pump, and performing subsequent process treatment.
The liquid obtained in example 2 of the present invention was examined according to the method of example 1, and the examination results are shown in Table 2:
TABLE 2 liquid index obtained by the treatment method provided in example 2 of the present invention
Figure 916723DEST_PATH_IMAGE002
From the above-mentioned detection results, it can be seen that the method provided in example 2 of the present invention can be applied to SiO-containing materials2The acid waste liquid is well treated.
Example 3
Will contain SiO2The acid wastewater enters an acid wastewater adjusting tank and compressed air is introduced into the acid wastewater adjusting tank to stir for 3 hours;
pumping lime milk into the acid wastewater adjusting tank for pH adjustment, and adjusting the pH to 9 to obtain a treated substance;
adding a polyaluminium chloride coagulant into the acid wastewater regulating tank, and stirring under the condition of compressed air to ensure that the coagulant and the SiO-containing coagulant are mixed2The mass ratio of the acid wastewater to the acid wastewater is 12:100, and a concrete is obtained;
adding polyacrylamide flocculant into the acidic wastewater regulating tank, and stirring under the condition of compressed air to make the flocculant and SiO-containing water2The mass ratio of the acid wastewater is 1.2:1000, and a flocculating constituent is obtained;
adding lime milk into the acidic wastewater regulating tank to regulate the pH value, so that the pH value of all substances in the acidic wastewater regulating tank reaches 9;
sampling and observing the size of a flocculating body, wherein the flocculating body is thick, compact and completely precipitated within 30 seconds;
starting a regulating reservoir lift pump, conveying the substances in the acidic wastewater regulating reservoir to a neutralization tank, stirring by using a neutralization tank stirrer, and then allowing the substances to flow into a clarification tank for clarification to separate colloidal silica (sediment) from liquid;
and conveying the colloidal silica precipitated at the bottom of the clarification tank to a concentration tank through a sludge discharge pump, and performing subsequent process treatment.
The liquid obtained in example 3 of the present invention was examined according to the method of example 1, and the examination results are shown in Table 3:
TABLE 3 liquid index obtained by the treatment method provided in example 3 of the present invention
Figure 105128DEST_PATH_IMAGE003
From the above-mentioned detection results, it can be seen that the method provided in example 3 of the present invention can be applied to SiO-containing materials2The acid waste liquid is well treated.
As can be seen from the above examples, the present invention provides a SiO-containing film2The method for treating acid wastewater, comprising: will contain SiO2Adjusting the pH of the acid wastewater to obtain a treated substance; mixing the treated substance with polyaluminium chloride to obtain a concrete; mixing the concrete and polyacrylamide to obtain a flocculating constituent; and clarifying the flocculating constituent after pH adjustment to obtain precipitate and liquid. The method provided by the invention adopts the process of 'neutralization, flocculation and separation' to treat SiO-containing materials2The acid wastewater is treated. The invention is directed to SiO-containing compositions of particular composition2The acid wastewater is sequentially treated by polyaluminium chloride and polyacrylamide, and the treating agent with specific components can treat the acid wastewater containing SiO2The acid wastewater is well treated, and a good treatment effect is obtained.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (1)

1. SiO-containing material2The acid wastewater treatment method comprises the following steps:
will contain SiO2The acid wastewater enters an acid wastewater adjusting tank and compressed air is introduced into the acid wastewater adjusting tank to stir for 2 hours;
pumping lime milk into the acid wastewater adjusting tank for pH adjustment, and adjusting the pH to 8 to obtain a treated substance;
blending the acidic wastewaterAdding a polyaluminium trichloride coagulant into the joint tank, and stirring under the condition of compressed air to ensure that the coagulant and the SiO-containing coagulant are mixed2The mass ratio of the acid wastewater to the acid wastewater is 8:100, and a concrete is obtained;
adding polyacrylamide flocculant into the acidic wastewater regulating tank, and stirring under the condition of compressed air to make the flocculant and SiO-containing water2The mass ratio of the acid wastewater is 0.8:1000, and a flocculating constituent is obtained;
adding lime milk into the acidic wastewater regulating tank to regulate the pH value, so that the pH value of all substances in the acidic wastewater regulating tank reaches 8;
sampling and observing the size of a flocculating body, wherein the flocculating body is thick, compact and completely precipitated within 30 seconds;
starting a regulating reservoir lift pump, conveying the substances in the acidic wastewater regulating reservoir to a neutralization tank, stirring by using a neutralization tank stirrer, and then allowing the substances to flow into a clarification tank for clarification to separate colloidal silica from liquid;
conveying the colloidal silica precipitated at the bottom of the clarification tank to a concentration tank through a sludge discharge pump, and performing subsequent process treatment;
the SiO-containing layer2The acid wastewater contains:
3400mg/L of SiO2(ii) a 800mg/L of Si; 400mg/L Fe; 100mg/L HCl; ferric chloride; 1mg/L of heavy metal ions.
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JP2003285074A (en) * 2002-03-28 2003-10-07 Mitsubishi Paper Mills Ltd Fluocculation/sedimentation treatment method for fine particulate silica-containing waste liquid
CN1238562C (en) * 2002-05-31 2006-01-25 宝山钢铁股份有限公司 Shallow slot turbulent flow acid washing method and apparatus for removing silicon
JP5731794B2 (en) * 2010-11-02 2015-06-10 アクアス株式会社 Coagulation treatment method for high-concentration silica-containing water
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