CN112939176B - Coal washing wastewater treating agent, and preparation method and application thereof - Google Patents
Coal washing wastewater treating agent, and preparation method and application thereof Download PDFInfo
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- CN112939176B CN112939176B CN202110114334.1A CN202110114334A CN112939176B CN 112939176 B CN112939176 B CN 112939176B CN 202110114334 A CN202110114334 A CN 202110114334A CN 112939176 B CN112939176 B CN 112939176B
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/547—Tensides
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- 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
- 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
- C02F2103/36—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 the manufacture of organic 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
Abstract
The invention belongs to the technical field of coal chemical industry, and particularly relates to a coal washing wastewater treating agent, and a preparation method and application thereof. The coal washing wastewater treatment agent comprises modified molecular sieve powder, polyacrylamide, a natural polymeric flocculant, a surfactant and hydrogen peroxide; the modified molecular sieve powder consists of molecular sieve powder and calcium oxide, and calcium oxide is contained in pores of the modified molecular sieve powder; the natural polymer flocculant is selected from one or a combination of more of cationic starch derivative flocculant, anionic starch derivative flocculant, amphoteric starch derivative flocculant, cationic lignin flocculant and anionic lignin flocculant. The coal washing wastewater treatment agent disclosed by the invention is used by matching polyacrylamide, a natural polymeric flocculant and modified molecular sieve powder, so that the dosage of polyacrylamide is reduced, metal ions such as iron and aluminum are not additionally introduced, and meanwhile, the coal washing wastewater treatment agent also has an excellent water purification effect.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a coal washing wastewater treating agent, and a preparation method and application thereof.
Background
The coal washing is a coal processing link which separates raw coal with different components and different specific gravities into different grades through the impact action of water flow, removes dust and waste rocks, and reduces the ash content and the sulfur content, and the coal washing can generate a large amount of coal washing wastewater. The coal washing wastewater has the characteristics of high SS, high COD concentration, extremely negative zeta potential, alkalescence, black ink color, S, fe and the like, has the properties of turbid liquid and colloid, is heavy in pollution and high in treatment difficulty, and mainly shows that suspended matters seriously exceed the standard, can stagnate a river channel and harm organisms to growth, and the dyeing effect of coal can cause landscape pollution, so that the coal washing wastewater can meet the discharge requirement specified by the state only by being purified.
Aiming at the purification treatment of coal washing wastewater, the selection of a proper treatment agent is a key factor, the treatment agents commonly used in the prior art comprise flocculating agents such as polyacrylamide, polyaluminium chloride and polyferric chloride, the flocculating and purifying effect of the polyacrylamide is the best, but the polyacrylamide has strong neurotoxicity and carcinogenicity and is not safe and environment-friendly enough, the dosage of the polyacrylamide needs to be reduced as much as possible and the single use needs to be avoided, the flocculating effect of the polyaluminium chloride and the polyferric chloride needs to be further improved, and the flocculating agents containing inorganic salts of iron and aluminum can increase the iron and aluminum contents of water, which is unfavorable for further purifying the water quality. With the increasing awareness of the country on environmental protection, controlling the content of metal elements such as iron and manganese in the waste water also gradually becomes one of the important tasks for monitoring the water quality environment, so that the waste water is not suitable for use in large quantities, and the content of metal aluminum ions in water should be controlled as much as possible to cause diseases such as senile dementia and the like.
Therefore, there is a need to continuously research and provide a novel green and environmentally friendly coal washing wastewater treatment agent.
Disclosure of Invention
The invention aims to provide a novel coal washing wastewater treatment agent, which avoids using polyacrylamide singly by using the polyacrylamide, a natural polymeric flocculant and modified molecular sieve powder in a matching way, is beneficial to reducing the using amount, does not introduce metal ions such as iron ions, aluminum ions and the like, and has excellent water purification effect.
A coal washing wastewater treatment agent comprises modified molecular sieve powder, polyacrylamide, a natural polymeric flocculant, a surfactant and hydrogen peroxide;
the modified molecular sieve powder consists of molecular sieve powder and calcium oxide, and calcium oxide is contained in pores;
the natural polymer flocculant is selected from one or a combination of more of cationic starch derivative flocculant, anionic starch derivative flocculant, amphoteric starch derivative flocculant, cationic lignin flocculant and anionic lignin flocculant.
As an example, the coal washing wastewater treatment agent comprises the following components in parts by weight:
5 to 20 parts of molecular sieve powder, 10 to 35 parts of calcium oxide, 20 to 50 parts of polyacrylamide, 10 to 30 parts of natural polymeric flocculant, 1 to 6 parts of surfactant and 0.5 to 4 parts of hydrogen peroxide.
As a further example, 8-15 parts of molecular sieve powder, 15-26 parts of calcium oxide, 25-40 parts of polyacrylamide, 18-25 parts of natural polymeric flocculant, 2-5 parts of surfactant and 1-2.5 parts of hydrogen peroxide.
As an example, the natural polymer flocculant comprises cationic starch derivative flocculant, anionic starch derivative flocculant and cationic lignin flocculant in the weight ratio of (1-6) to 1 to (0.7-1.1), and as a further example, the natural polymer flocculant comprises cationic starch derivative flocculant, anionic starch derivative flocculant and cationic lignin flocculant in the weight ratio of (2-4) to 1 to (0.8-1).
As an example, the surfactant is selected from one or a combination of several of phenethyl phenol polyoxyethylene (n = 15-30) ether, dodecylbenzene sulfonic acid, ethylene glycol, isopropanol and alpha-sodium alkenyl sulfonate.
The invention also provides a preparation method of the coal washing wastewater treatment agent, which comprises the step of uniformly mixing all components of the coal washing wastewater treatment agent.
As an example, in the preparation method of the coal washing wastewater treatment agent, the preparation method of the modified molecular sieve powder is as follows:
s1, adding molecular sieve powder into lime milk, and mechanically stirring to obtain a mixture A;
s2, introducing carbon dioxide gas into the mixture A to carry out gas stirring to obtain a mixture B;
s3, filtering the mixture B to obtain a modified molecular sieve precursor;
and S4, roasting the modified molecular sieve precursor to obtain the modified molecular sieve.
As an example, step S1 also pre-treats the molecular sieve powder as follows:
s11, preparing a hydrochloric acid-ammonium fluoride aqueous solution, heating to 55-65 ℃, adding molecular sieve powder, stirring at a constant temperature for 2-4 hours, filtering, washing, and collecting a filter cake;
wherein, in the hydrochloric acid-ammonium fluoride aqueous solution, the mass fraction of the hydrogen chloride is 3-6%, and the mass fraction of the ammonium fluoride is 15-30%;
s12, treating the filter cake in water vapor at 550-800 ℃ and 0.9-1.6 MPa for 0.5-2 h.
As an example, the time of the mechanical stirring is 3.5 to 12 hours; the carbon dioxide is 1.0-1.2 MPa, and the gas stirring time is 2.5-10 h.
As an example, the roasting temperature is 630-750 ℃, and the roasting time is 1.5-5.5 h.
The invention also relates to application of the coal washing wastewater treatment agent, wherein the pH value of the coal washing wastewater is 7-9, the SS is 40000-80000 mg/L, and the dosage of the coal washing wastewater treatment agent is 40-150 mg/L.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the coal washing wastewater treating agent disclosed by the invention is used in a composite manner through polyacrylamide, a natural polymeric flocculant and modified molecular sieve powder, achieves a synergistic effect, is good in flocculation precipitation effect, avoids singly using polyacrylamide, is beneficial to reducing the using amount of the polyacrylamide, and is safer and more environment-friendly.
2. After the modified molecular sieve powder containing calcium oxide in the pores enters the coal washing wastewater, the calcium oxide in the pores quickly releases calcium ions when meeting water and hydrogen peroxide to form countless charged micro-centers, quickly reduces zeta-potential of a coal washing wastewater colloid system, promotes coal slime particle coagulation, and forms large floccules and quickly settles by means of the action of polyacrylamide and a natural polymeric flocculant.
3. The coal washing wastewater treatment agent also contains a small amount of hydrogen peroxide, on one hand, the calcium ions in the pores of the molecular sieve can be promoted to be released, the sedimentation speed is assisted to be improved, on the other hand, the strong oxidizing property of the hydrogen peroxide can be matched with the porous structure characteristic of the molecular sieve, the effect of converting and adsorbing COD can be achieved, and the content of COD in the coal washing wastewater can be further reduced. And because the high-concentration coal washing wastewater is alkalescent, and the weakly acidic hydrogen peroxide can also neutralize part of alkalinity, the coal washing wastewater is close to neutral water, and is convenient to discharge or recycle.
4. The invention further optimizes the proportion of each component in the basic concept to achieve the effects of better flocculation precipitation, COD reduction, metal ion removal and the like, and reduces the input amount of a coal washing wastewater treatment agent, the generation of solid waste and the treatment cost of the coal washing wastewater.
5. The surfactant such as phenethyl phenol polyoxyethylene (n = 15-30) ether, dodecyl benzene sulfonic acid, glycol, isopropanol, alpha-sodium alkenyl sulfonate and the like can be used for cooperating with polyacrylamide and a natural polymeric flocculant, so that tiny carbon particles are removed more cleanly, and a better flocculation sedimentation effect is obtained.
6. The molecular sieve powder is firstly dipped in the lime cream, and then stirred by carbon dioxide gas, calcium carbonate is formed in pores of the molecular sieve, the calcium carbonate can be decomposed into calcium oxide during roasting, the modified molecular sieve with the calcium oxide uniformly distributed in the pores is obtained, and when the modified molecular sieve is put into coal washing wastewater with high negative charges, the zeta-potential can be rapidly reduced, and the sedimentation is further promoted. And the preparation raw materials are rich and easy to obtain, the manufacturing cost is low, and the industrialization is convenient.
7. The invention pretreats the molecular sieve powder to obtain suitable pore size and more structural defects, thereby facilitating the full adsorption of calcium hydroxide and facilitating the formation of abundant zeta-potential charged micro-centers in subsequent processes.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. 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.
The chemical reagents used in the following examples of the present invention are not specifically described, and are commercially available conventional reagents.
The following embodiment of the invention provides a coal washing wastewater treatment agent, which comprises modified molecular sieve powder, polyacrylamide, a natural polymeric flocculant, a surfactant and hydrogen peroxide;
the modified molecular sieve powder consists of molecular sieve powder and calcium oxide, and calcium oxide is contained in pores;
the natural polymer flocculant is selected from one or a combination of more of cationic starch derivative flocculant, anionic starch derivative flocculant, amphoteric starch derivative flocculant, cationic lignin flocculant and anionic lignin flocculant.
The modified molecular sieve powder of the invention can be obtained by the preparation method of the invention, and can also be obtained by other methods which can load calcium oxide in the pores of the molecular sieve, and the modified molecular sieve powder is not limited to the preparation method shown in the invention as long as the modified molecular sieve can be provided.
The molecular sieve powder of the invention can be a conventional product sold in the market. The molecular sieve powder specifically used in the invention is selected from any one or a combination of several of the following products:
x-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve, mordenite, beta-type zeolite, SAPO-type molecular sieve, ALPO-type molecular sieve, MCM-22 molecular sieve, MCM-49, MCM-56, SSZ-13 molecular sieve, ZSM-5/mordenite, ZSM-5/beta zeolite, ZSM-5/Y, MCM-22/mordenite, ZSM-5/Magadiite, ZSM-5/beta zeolite/mordenite or ZSM-5/beta zeolite/Y zeolite or ZSM-5/Y zeolite/mordenite.
The cationic starch derivative flocculant, the anionic starch derivative flocculant and the cationic lignin flocculant of the present invention may be commercially available products, or may be prepared by methods described in the literature. The invention refers to the corresponding literature method to prepare the corresponding flocculant in the concrete implementation, which is as follows:
1. cationic starch derivative flocculant (marked as A)
Lvrong lake, zhanghong rock, jianing, preparation of cationic modified starch flocculant and flocculation performance research [ J ] proceedings of chinese petroleum university, 2006, 30 (4): 118-122.
2. Anionic starch derivative flocculant (marked as B)
Zhaoyuan, wenzhizhi, synthesis of carboxymethyl starch for water treatment [ J ] water treatment technology, 2006, 32 (3): 76-77.
3. Cationic lignin flocculant (marked as C)
Modesty of the cassia delicacy, the haiwa and the somber, studies on the synthesis and decolorization performance of cationic flocculant lignin quaternary ammonium salt [ J ].2003, 23 (2): 37-41.
4. Amphoteric starch derivative flocculant (marked as D)
In situ preparation and properties of amphiphilic starch graft copolymers, songzhao, panpinhan, chenyuzhan, etc. [ J ] guangzhou chemistry, 2002, 27 (2): 27-30.
5. Anionic lignin flocculant (marked as E)
Synthesis and application of Chenjunping alkali lignin anionic polymeric flocculant [ J ]. Proceedings of Hubei academy of industry, 1994,9 (2).
The formulation ratios and the like referred to in the specific examples set forth below are exemplary solutions based on the basic inventive concept, but are not intended to unduly limit the inventive concept.
Examples 1 to 6
The concrete compositions of the coal washing wastewater treatment agents of examples 1 to 6 are shown in Table 1.
TABLE 1
The specific compositions of the natural polymeric flocculants of examples 1 to 6 are shown in table 2 below.
TABLE 2
In examples 1 to 6, the specific compositions of the surfactants are shown in Table 3.
TABLE 3
The specific types of molecular sieve powders in examples 1 to 6 are shown in Table 4.
TABLE 4
| Specific composition of molecular sieve powder | |
| Example 1 | X-type molecular sieve |
| Example 2 | A type molecular sieve |
| Example 3 | ZSM type molecular sieve |
| Example 4 | Mordenite: x type molecular sieve = 1: 1 |
| Example 5 | ZSM-5/beta zeolite |
| Example 6 | ZSM-5/beta zeolite/mordenite |
The basic steps of the preparation process for examples 1-6 are as follows:
preparing the components according to the formula of each embodiment, and then uniformly mixing the components to obtain the corresponding coal washing wastewater treatment agent, wherein the preparation method of the modified molecular sieve powder consisting of the molecular sieve powder and the calcium oxide comprises the following steps:
s11, preparing a hydrochloric acid-ammonium fluoride aqueous solution, heating to 55-65 ℃, adding molecular sieve powder, stirring at a constant temperature for 2-4 hours, filtering, washing, and collecting a filter cake;
wherein, in the hydrochloric acid-ammonium fluoride aqueous solution, the mass fraction of hydrogen chloride is 3-6%, and the mass fraction of ammonium fluoride is 15-30%;
s12, treating the obtained filter cake in water vapor at the temperature of 550-800 ℃ and the pressure of 0.9-1.6 MPa for 0.5-2 h;
s1, adding the pretreated molecular sieve powder into lime milk, and mechanically stirring for 3.5-12 hours to obtain a mixture A;
s2, introducing 1.0-1.2 MPa carbon dioxide gas into the mixture A to perform gas stirring for 2.5-10 h to obtain a mixture B;
s3, filtering the mixture B to obtain a modified molecular sieve precursor;
s4, roasting the modified molecular sieve precursor at the roasting temperature of 630-750 ℃ for 1.5-5.5 hours to obtain the modified molecular sieve.
The parameters of the preparation processes of examples 1 to 6 are specifically shown in Table 5.
TABLE 5
Comparative example 1
The difference from example 1 is that instead of using modified molecular sieve containing calcium oxide in the pores, the molecular sieve powder of the same formulation as in example 1 was directly mixed with solid calcium oxide powder, and the rest was the same as example 1.
Comparative example 2
The difference from example 2 is that the composition does not contain hydrogen peroxide, and the rest is consistent with example 2.
Comparative example 3
The difference from example 3 is that the components do not contain corresponding natural polymeric flocculant, and the others are consistent with example 3.
Comparative example 4
The difference from example 4 is that the corresponding polyacrylamide is not included in the composition, and the others are in accordance with example 4.
Effect test 1
The adopted test water samples are as follows: the Henan coke is taken as a certain batch of wastewater of a certain coal washing plant, and the properties and characteristics shown in the following table are obtained through detection and analysis.
TABLE 6
| pH | SS(mg/ml) | COD(mg/ml) |
| 8.4 | 65269.6 | 4038.1 |
8 parts of the coal washing wastewater sample of 1L are taken, and 40mg of the treatment agents of the examples 1-6 and the comparative examples 1-4 are respectively added for parallel tests.
The stirring speed gradient G value of each group of experiments is 20s -1 Stirring for 1min under the condition, pouring into a measuring cylinder for precipitation, recording the height of the mud surface at different times within 60min, calculating the average precipitation speed, and then detecting the SS value and the COD value of the supernatant, wherein the specific experimental results are shown in the following table:
TABLE 7
From the above experimental results, it is understood that the coal washing wastewater treatment agents prepared in examples 1 to 6 of the present invention have a high precipitation rate and can efficiently reduce SS and COD values in the coal washing wastewater.
Comparative examples 1 to 4 lack only one component of the technical idea of the present invention, but the precipitation rate is significantly reduced and the removal effect of SS and COD is significantly lower than that of examples 1 to 6 of the present invention, and it can be seen that the components of the technical idea of the present invention are synergistic with each other and lack of one of them deteriorates the treatment effect.
It is clear that the above examples are only examples for clarity of illustration and are not limiting and exhaustive of the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (8)
1. The coal washing wastewater treating agent is characterized by comprising the following components in parts by weight: 5-20 parts of molecular sieve powder, 10-35 parts of calcium oxide, 20-50 parts of polyacrylamide, 10-30 parts of natural polymeric flocculant, 1-6 parts of surfactant and 0.5-4 parts of hydrogen peroxide;
the modified molecular sieve powder consists of molecular sieve powder and calcium oxide, and calcium oxide is contained in pores of the modified molecular sieve powder;
the natural polymer flocculant is selected from one or a combination of several of cationic starch derivative flocculant, anionic starch derivative flocculant, amphoteric starch derivative flocculant, cationic lignin flocculant and anionic lignin flocculant;
the preparation method of the modified molecular sieve powder comprises the following steps:
s1, adding molecular sieve powder into lime milk, and mechanically stirring to obtain a mixture A;
s2, introducing carbon dioxide gas into the mixture A to carry out gas stirring to obtain a mixture B;
s3, filtering the mixture B to obtain a modified molecular sieve precursor;
s4, roasting the modified molecular sieve precursor to obtain the modified molecular sieve precursor;
step S1 also performs the following pretreatment on the molecular sieve powder:
s11, preparing a hydrochloric acid-ammonium fluoride aqueous solution, heating to 55-65 ℃, adding molecular sieve powder, stirring at a constant temperature for 2-4 hours, filtering, washing, and collecting a filter cake;
wherein, in the hydrochloric acid-ammonium fluoride aqueous solution, the mass fraction of hydrogen chloride is 3-6%, and the mass fraction of ammonium fluoride is 15-30%;
s12, treating the filter cake in water vapor at 550-800 ℃ and 0.9-1.6 MPa for 0.5-2 h.
2. The coal washing wastewater treatment agent according to claim 1, which is characterized by comprising the following components in parts by weight: 8-15 parts of molecular sieve powder, 15-26 parts of calcium oxide, 25-40 parts of polyacrylamide, 18-25 parts of natural polymeric flocculant, 2-5 parts of surfactant and 1-2.5 parts of hydrogen peroxide.
3. The coal washing wastewater treatment agent according to claim 1, wherein the natural polymeric flocculant is a cationic starch derivative flocculant, an anionic starch derivative flocculant and a cationic lignin flocculant, and the weight ratio of the cationic starch derivative flocculant to the anionic starch derivative flocculant to the cationic lignin flocculant is (1 to 6): 1, (0.7 to 1.1).
4. The coal washing wastewater treatment agent according to claim 3, wherein the weight ratio of the cationic starch derivative flocculant to the anionic starch derivative flocculant to the cationic lignin flocculant is (2 to 4): 1, (0.8 to 1).
5. The coal washing wastewater treatment agent according to claim 1, wherein the surfactant is one or a combination of several selected from phenethylphenol polyoxyethylene (n = 15-30) ether, dodecylbenzene sulfonic acid, ethylene glycol, isopropanol and sodium alpha-alkenyl sulfonate.
6. The coal washing wastewater treatment agent according to claim 1, wherein the mechanical stirring time is 3.5 to 12 hours; the carbon dioxide is 1.0-1.2 MPa, and the gas stirring time is 2.5-10 h.
7. The coal washing wastewater treatment agent according to claim 1, wherein the roasting temperature is 630-750 ℃, and the roasting time is 1.5-5.5 h.
8. The use of the coal washing wastewater treatment agent according to any one of claims 1 to 7, wherein the pH of the coal washing wastewater is 7 to 9, the SS is 40000 to 80000mg/L, and the dosage of the coal washing wastewater treatment agent is 40 to 150mg/L.
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Citations (4)
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|---|---|---|---|---|
| JP2004305893A (en) * | 2003-04-07 | 2004-11-04 | Junsuke Haruna | Solid-state waste water treating agent using artificial zeolite |
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| CN110386650A (en) * | 2018-04-20 | 2019-10-29 | 上海四奥化工有限公司 | Coal washing polyacrylamide flocculant and preparation method thereof |
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- 2021-02-02 CN CN202110114334.1A patent/CN112939176B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004305893A (en) * | 2003-04-07 | 2004-11-04 | Junsuke Haruna | Solid-state waste water treating agent using artificial zeolite |
| CN102963953A (en) * | 2012-11-28 | 2013-03-13 | 大连东泰产业废弃物处理有限公司 | Method for treating coal washing wastewater |
| CN105217842A (en) * | 2015-10-30 | 2016-01-06 | 无锡市嘉邦电力管道厂 | A kind of waste water treatment process |
| CN110386650A (en) * | 2018-04-20 | 2019-10-29 | 上海四奥化工有限公司 | Coal washing polyacrylamide flocculant and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 铁法煤矿洗煤废水处理的研究;李长久，吴晓辉，赵以恒，王德英;《工业水处理》;19960602(第03期);全文 * |
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