CN108862504B - Preparation process of solid polysilicate metal salt-polyaluminium coagulant - Google Patents
Preparation process of solid polysilicate metal salt-polyaluminium coagulant Download PDFInfo
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- CN108862504B CN108862504B CN201810622371.1A CN201810622371A CN108862504B CN 108862504 B CN108862504 B CN 108862504B CN 201810622371 A CN201810622371 A CN 201810622371A CN 108862504 B CN108862504 B CN 108862504B
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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
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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
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention relates to a metal salt coagulant, in particular to a solid polysilicate metal-polyaluminium coagulant and a preparation process thereof, wherein the coagulant mainly comprises the following components: 27-200 parts of aluminum chloride, 14.5-52 parts of quick lime, 11.7-36 parts of hydrated lime, 11.3-36 parts of sodium carbonate, 16-67 parts of sodium hydroxide, 3-29 parts of potassium hydroxide, 1-300 parts of water, 1-60 parts of sulfuric acid, 1-200 parts of fly ash and 3-70 parts of water glass; the invention adopts a direct or acid-soaking mode to prepare the solid polysilicate metal salt-polyaluminium coagulant, provides different preparation processes under different conditions, can ensure the stability of the solid coagulant, and overcomes the problem of poor stability of the polysilicate metal salt coagulant; the fly ash-containing solid coagulant can be used for the landfill leachate coagulation treatment process, can effectively utilize fly ash to prepare the solid coagulant for treating the landfill leachate, can realize resource recycling, and brings certain benefits to the environment.
Description
Technical Field
The invention relates to a metal salt coagulant, in particular to a preparation process of a solid polysilicate metal salt-polyaluminium coagulant.
Background
The polyaluminium chloride has good coagulation effect on wastewater with serious pollution, large formed alum floc, quick mud-water separation and small corrosion effect on equipment, so the polyaluminium chloride is widely applied to wastewater in various fields. However, polyaluminium has many disadvantages, such as (1) toxicity problem, and aluminium salt is accumulated in human body after entering human body through various routes and participates in many biochemical reactions, resulting in toxic symptoms; (2) the low-temperature low-turbidity treatment capability is poor, and the use of aluminum salt can aggravate the turbidity of effluent; (3) the aluminum flocculant is susceptible to the influence of coexisting salt, and the flocculation effect is weakened; the literature reports that the polymerization form and the conversion of aluminum are changed in the interaction process of polysilicic acid and aluminum hydrolysate, which affects the stability of colloidal particles in water, but the polysilicic acid is used for adsorbing and bridging, so that the colloidal particles which are destabilized by flocculation and precipitation can be continuously flocculated and are superior to simple aluminum salt coagulants.
The invention introduces polysilicic acid, improves the treatment of the product in low-temperature and low-turbidity water, and provides a method for producing the stable polysilicic acid metal salt coagulant, which utilizes the characteristics of polyaluminium chloride in the synthesis process and combines the synthesis of the polysilicic acid to finally obtain the stable polysilicic acid metal salt coagulant; in addition, the fly ash is introduced into the filler used in the invention, and the fly ash is recycled; the product synthesized by the acid leaching method of the invention is a method of utilizing fly ash, thereby obtaining different kinds of polysilicate metal coagulants.
Disclosure of Invention
In order to solve the problems, the invention aims to disclose a metal salt coagulant, in particular to a preparation process of a solid polysilicate metal salt-polyaluminium coagulant.
In order to achieve the purpose, the invention adopts the technical scheme that: the solid polysilicate metal-polyaluminium coagulant is characterized by mainly comprising the following components: 27-200 parts of aluminum chloride, 14.5-52 parts of quick lime, 11.7-36 parts of hydrated lime, 11.3-36 parts of sodium carbonate, 16-67 parts of sodium hydroxide, 3-29 parts of potassium hydroxide, 1-300 parts of water, 1-60 parts of sulfuric acid, 1-200 parts of fly ash and 3-70 parts of water glass.
The coagulant also comprises the following components: 1-50 parts of aluminum sulfate, diatomite, white carbon black, ferrous sulfate, ferric chloride, magnesium chloride, zinc chloride, hydrochloric acid and nitric acid.
The mass ratio of the aluminum chloride to the quick lime to the hydrated lime to the sodium carbonate to the sodium hydroxide to the potassium hydroxide is 10:3:2:2:4: 1.
The mass ratio of the fly ash to the water glass is 3-5: 1.
A preparation process of a solid polysilicate metal-polyaluminium coagulant is characterized by mainly comprising the following steps:
1) taking aluminum chloride as a main raw material and quicklime, slaked lime, sodium carbonate, sodium hydroxide and potassium hydroxide as auxiliary raw materials to react and synthesize polyaluminum chloride;
2) firstly, adding 98g of polyaluminium chloride into a reaction kettle, wherein the polyaluminium chloride consists of one or more of aluminum chloride and auxiliary raw materials, adjusting the alkalinity of the whole reaction, and stirring at a high speed to flexibly stir at the temperature of 55-80 ℃ for 11.8-24.3 hours to obtain a flowable viscous liquid A, so that the instant temperature of the flowable viscous liquid A is kept without cooling, and polyaluminium gradually changes from liquid to solid block in the cooling process, so that the polyaluminium high-temperature viscous liquid is directly added into a viscous polysilicic acid solution and also changes into block in the cooling process;
3) mixing 9.8g of water glass with 9.6-10 mL of water in a first reaction container to form a mixed solution, adding 4.9-6.3 mL of 1+1 sulfuric acid in a second reaction container, gradually adding the mixed solution under a high-speed stirring state, and stirring for 2-4 hours to obtain a flowable viscous polysilicic acid liquid B;
4) adding the liquid A which is not cooled at high temperature into the liquid B in the second reaction vessel, uniformly stirring, adding one or more of fly ash, aluminum sulfate, diatomite and white carbon black as fillers to dry the product, preventing the product from forming hydrogel, uniformly stirring, and cooling under stirring to obtain the massive solid polysilicate metal salt-polyaluminium coagulant.
The other preparation step of the step 3) is as follows: adding 10mL of water into a second reaction container, adding 10g of water glass into the water, stirring for 10-20 min until the mixture is completely uniform, adding one or more of ferrous sulfate, aluminum chloride, ferric chloride, magnesium chloride and zinc chloride, stirring for 2-4 h, adding 5-6 mL of 1+1 sulfuric acid, and stirring for 20-30 min to obtain a liquid B.
In the step 4), the solid polysilicate metal-polyaluminium coagulant is used for wastewater treatment, and the treated incineration fly ash is repeatedly used for preparing the solid polysilicate metal-polyaluminium coagulant, so that circulation is realized; adding a coagulant prepared repeatedly by secondary fly ash to prepare a coagulation treatment agent specially used in the incineration sludge treatment process; the coagulant prepared repeatedly by secondary fly ash components is reduced, and the special wastewater treatment coagulant for treating various kinds of wastewater is prepared.
A preparation process of a solid polysilicate metal-polyaluminium coagulant is characterized by mainly comprising the following steps:
1) firstly, preparing acid liquor C:
firstly, washing fly ash and water according to a liquid-solid ratio of 10:1, wherein the leaching time is 24-48 h;
② leaching solution: preparing mixed acid by adopting sulfuric acid and hydrochloric acid or nitric acid, and preparing leaching solution by adopting the mixed acid and water 1+ 1;
mixing the fly ash and the leaching solution for leaching experiment, wherein the leaching time is 48-96 h, filtering, naturally drying the filter residue D, and obtaining filtrate as acid solution C;
2) taking aluminum chloride as a main raw material and quicklime, slaked lime, sodium carbonate, sodium hydroxide and potassium hydroxide as auxiliary raw materials to react and synthesize polyaluminum chloride;
3) firstly, 95.61-100.75 g of polyaluminium chloride and 9.7-11.0 mL of water are added into a reaction kettle, high-speed stirring is changed into flexible stirring at the temperature of 55-80 ℃, and the mixture reacts for 12-24 hours to obtain a flowable viscous liquid E, so that the flowable viscous liquid E is kept at the instant temperature without being cooled, and polyaluminium gradually changes from liquid to solid block in the cooling process, so that the polyaluminium high-temperature viscous liquid is directly added into a viscous polysilicic acid solution and also changes into block in the cooling process;
4) mixing 12.5-12.7 g of water glass with 12.3-13.1 mL of water in a first reaction container to form a mixed solution, then adding 10-12 mL of acid solution C in a second reaction container, gradually adding the mixed solution under a high-speed stirring state, and stirring for 2-4 hours to obtain a flowable viscous polysilicic acid liquid F;
5) and adding the high-temperature uncooled liquid E into the liquid F in the second reaction vessel, uniformly stirring, adding the filter residue D, uniformly stirring, and cooling under stirring to obtain the massive solid polysilicate metal salt-polyaluminium coagulant.
The other preparation step of the step 4) is as follows: adding 12.3-13.1 mL of water into a second reaction container, adding 12.5-12.7 g of water glass into the water, stirring for 10-20 min until the mixture is completely uniform, adding one or more of ferrous sulfate, aluminum chloride, ferric chloride, magnesium chloride and zinc chloride, stirring for 2-4 h, adding 10-12 mL of acid liquor C, and stirring for 20-30 min to obtain a liquid F.
In the step 5), the solid polysilicate metal-polyaluminium coagulant is used for wastewater treatment, and the treated incineration fly ash is repeatedly used for preparing the solid polysilicate metal-polyaluminium coagulant, so that circulation is performed; adding a coagulant prepared repeatedly by secondary fly ash to prepare a coagulation treatment agent specially used in the incineration sludge treatment process; the coagulant prepared repeatedly by secondary fly ash components is reduced, and the special wastewater treatment coagulant for treating various kinds of wastewater is prepared.
The invention has the beneficial effects that: the invention adopts two modes of direct reaction or acid soaking to prepare the solid polysilicate metal salt-polyaluminium coagulant, provides different preparation processes for different application requirements or preparation environments, can ensure the stability of the solid coagulant, and overcomes the problem of poor stability of the polysilicate metal salt coagulant; the fly ash-containing solid coagulant can be used for the landfill leachate coagulation treatment process, can effectively utilize fly ash to prepare the solid coagulant for treating the landfill leachate, can realize resource recycling, and brings certain benefits to the environment.
The solid polysilicate metal salt-polyaluminium coagulant prepared by utilizing the fly ash can be used for treating various waste water, after the prepared coagulant is used for the waste water, all heavy metals and harmful substances return to sludge to be incinerated again, the fly ash generated by incinerating the sludge is also used for preparing the coagulant again, the fly ash can be used for preparing the coagulant, and the coagulant can also be used for treating the waste water and incinerating the sludge, so that the solid polysilicate metal salt-polyaluminium coagulant prepared by recycling the fly ash can be continuously used for treating the waste water and treating garbage in a garbage incineration plant; the process is circulated continuously until the heavy metal ions in the fly ash generated by the sludge are higher and have the value of secondary recovery, and the recovery is carried out at the moment.
Because the heavy metal in the fly ash is difficult to extract and secondarily utilize, the invention well utilizes the characteristics of the fly ash, the fly ash can provide metal ions for reaction and can also be used as a dry substance to prepare a coagulant for treating waste water before incineration; in addition, the drying agent is used as inert powder to separate the contact between polysilicic acid particles, so that the further polymerization failure of the polysilicic acid product is prevented, the mechanism is similar to that a coating film is formed on the surface of a substance by adsorption, the effect of dewatering and preventing contact is achieved, the effect of stabilizing the product is achieved, the problem that the coagulant of the polysilicic acid is poor in stability is solved, and the product of solid polysilicic acid metal salt which is not seen in the market is also produced; the aluminum sulfate, the diatomite, the fly ash, the white carbon black or the filter residue and the like which are added at last have the function of preventing further polymerization of the polysilicic acid; the substances are common medicaments in water treatment, and the effect of the total medicament is not influenced.
Detailed Description
The following describes specific embodiments of the present invention:
the solid polysilicate metal-polyaluminium coagulant is characterized by mainly comprising the following components: 27-200 parts of aluminum chloride, 14.5-52 parts of quick lime, 11.7-36 parts of hydrated lime, 11.3-36 parts of sodium carbonate, 16-67 parts of sodium hydroxide, 3-29 parts of potassium hydroxide, 1-300 parts of water, 1-60 parts of sulfuric acid, 1-200 parts of fly ash and 3-70 parts of water glass; the mass ratio of the aluminum chloride to the quicklime to the slaked lime to the sodium carbonate to the sodium hydroxide to the potassium hydroxide is 10:3:2:2:4: 1; the mass ratio of the fly ash to the water glass is 3-5: 1.
The coagulant also comprises the following components: 1-50 parts of aluminum sulfate, diatomite, white carbon black, ferrous sulfate, ferric chloride, magnesium chloride, zinc chloride, hydrochloric acid and nitric acid, and more specifically 3-17 parts of aluminum sulfate, 2.5-19 parts of diatomite, 1.5-18.6 parts of white carbon black, 5.8-23.5 parts of ferrous sulfate, 2.3-17.6 parts of ferric chloride, 1.5-23.8 parts of magnesium chloride, 5.5-37.8 parts of zinc chloride, 1-19 parts of hydrochloric acid and 1-19 parts of nitric acid.
Example one, a solid polysilicate metal salt-polyaluminium coagulant is prepared directly:
a preparation process of a solid polysilicate metal-polyaluminium coagulant is characterized by mainly comprising the following steps:
1) 60g of aluminum chloride is used as a main raw material, and 18g of quick lime, 12g of slaked lime, 12g of sodium carbonate, 24g of sodium hydroxide and 6g of potassium hydroxide are used as auxiliary raw materials to react and synthesize polyaluminum chloride;
2) firstly, adding 98g of polyaluminium chloride into a reaction kettle, wherein the polyaluminium chloride consists of one or more of aluminum chloride and auxiliary raw materials, adjusting the alkalinity of the whole reaction, and 9.8mL of water is subjected to reaction for 11.8-24.3 hours at the temperature of 55-80 ℃ after high-speed stirring and flexible stirring to obtain a flowable viscous liquid A, so that the flowable viscous liquid A is kept at the instant temperature without cooling, and polyaluminium gradually changes from liquid to solid block in the cooling process, so that the polyaluminium high-temperature viscous liquid is directly added into a viscous polysilicic acid solution and also changes into block in the cooling process;
3) mixing 9.8g of water glass with 9.8mL of water in a first reaction container to form a mixed solution, then adding 4.9-6.3 mL of 1+1 sulfuric acid in a second reaction container, gradually adding the mixed solution under a high-speed stirring state, and stirring for 2-4 hours to obtain a flowable viscous polysilicic acid liquid B;
4) adding the high-temperature uncooled liquid A into the liquid B in the second reaction vessel, uniformly stirring, adding one or more of 35g of fly ash, 4-10 g of aluminum sulfate, 3-18 g of diatomite and 3-18 g of white carbon black as a filler to dry the product, preventing the product from being gelled, uniformly stirring, and cooling under stirring to obtain the massive solid polysilicate metal-polyaluminium coagulant.
The other preparation step of the step 3) is as follows: adding 10mL of water into a second reaction container, adding 10g of water glass into the water, stirring for 10-20 min until the mixture is completely uniform, adding one or more of 6-8 g of ferrous sulfate, 5-7 g of aluminum chloride, 3-6 g of ferric chloride, 2-5 g of magnesium chloride and 6-12 g of zinc chloride, stirring for 2-4 h, adding 5-6 mL of 1+1 sulfuric acid, and stirring for 20-30 min to obtain a liquid B;
in the step 4), the solid polysilicate metal-polyaluminium coagulant is used for wastewater treatment, and the treated incineration fly ash is repeatedly used for preparing the solid polysilicate metal-polyaluminium coagulant, so that circulation is realized; adding a coagulant prepared repeatedly by secondary fly ash to prepare a coagulation treatment agent specially used in the incineration sludge treatment process; the coagulant prepared repeatedly by secondary fly ash components is reduced, and the special wastewater treatment coagulant for treating various kinds of wastewater is prepared.
Example two, a solid polysilicic acid metal salt-polyaluminium coagulant was prepared using an pickle liquor:
a preparation process of a solid polysilicate metal-polyaluminium coagulant is characterized by mainly comprising the following steps:
1) firstly, preparing acid liquor C:
firstly, washing fly ash and water according to a liquid-solid ratio of 10:1, wherein the leaching time is 24-48 h;
② leaching solution: preparing mixed acid by adopting sulfuric acid and hydrochloric acid or nitric acid, and preparing leaching solution by adopting the mixed acid and water 1+ 1;
mixing the fly ash and the leaching solution for leaching experiment, wherein the leaching time is 48-96 h, filtering, naturally drying the filter residue D, and obtaining filtrate as acid solution C;
2) 60g of aluminum chloride is used as a main raw material, and 18g of quick lime, 12g of slaked lime, 12g of sodium carbonate, 24g of sodium hydroxide and 6g of potassium hydroxide are used as auxiliary raw materials to react and synthesize polyaluminum chloride;
3) firstly, adding 98g of polyaluminium chloride and 9.8mL of water into a reaction kettle, stirring at a high speed to flexibly stir at a temperature of 55-80 ℃ and reacting for 12-24 h to obtain a flowable viscous liquid E, keeping the temperature of the flowable viscous liquid E in real time without cooling, and gradually changing the liquid into solid blocks in the cooling process of polyaluminium, so that the high-temperature viscous liquid of polyaluminium is directly added into a viscous polysilicic acid solution and also changed into blocks in the cooling process;
4) mixing 12.6g of water glass with 12.6mL of water in a first reaction container to form a mixed solution, then adding 10-12 mL of acid solution C in a second reaction container, gradually adding the mixed solution under a high-speed stirring state, and stirring for 2-4 hours to obtain a flowable viscous polysilicic acid liquid F;
5) and adding the high-temperature uncooled liquid E into the liquid F in the second reaction vessel, uniformly stirring, adding the filter residue D, uniformly stirring, and cooling under stirring to obtain the massive solid polysilicate metal salt-polyaluminium coagulant.
The other preparation step of the step 4) is as follows: adding 12.6mL of water into a second reaction container, adding 12.6g of water glass into the water, stirring for 10-20 min until the mixture is completely uniform, adding one or more of 6-8 g of ferrous sulfate, 5-7 g of aluminum chloride, 3-6 g of ferric chloride, 2-5 g of magnesium chloride and 6-12 g of zinc chloride, stirring for 2-4 h, adding 10-12 mL of acid liquor C, and stirring for 20-30 min to obtain a liquid F.
In the step 5), the solid polysilicate metal-polyaluminium coagulant is used for wastewater treatment, and the treated incineration fly ash is repeatedly used for preparing the solid polysilicate metal-polyaluminium coagulant, so that circulation is performed; adding a coagulant prepared repeatedly by secondary fly ash to prepare a coagulation treatment agent specially used in the incineration sludge treatment process; the coagulant prepared repeatedly by secondary fly ash components is reduced, and the special wastewater treatment coagulant for treating various kinds of wastewater is prepared.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, and those skilled in the art may make modifications and variations within the spirit of the present invention, and all modifications, equivalents and modifications of the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (6)
1. A preparation process of a solid polysilicate metal-polyaluminium coagulant is characterized in that the coagulant mainly comprises the following components: 27-200 parts of aluminum chloride, 14.5-52 parts of quick lime, 11.7-36 parts of slaked lime, 11.3-36 parts of sodium carbonate, 16-67 parts of sodium hydroxide, 3-29 parts of potassium hydroxide, 1-300 parts of water, 1-60 parts of sulfuric acid and 3-70 parts of water glass; the preparation process mainly comprises the following steps:
1) taking aluminum chloride as a main raw material and quicklime, slaked lime, sodium carbonate, sodium hydroxide and potassium hydroxide as auxiliary raw materials to react and synthesize polyaluminum chloride;
2) firstly, adding 98g of polyaluminium chloride and 9.6-9.9 mL of water into a reaction kettle, and reacting for 11.8-24.3 hours from high-speed stirring to flexible stirring at the temperature of 55-80 ℃ to obtain a flowable viscous liquid A, so that the flowable viscous liquid A is kept at the instant temperature without cooling;
3) mixing 9.8g of water glass with 9.6-10 mL of water in a first reaction container to form a mixed solution, adding 4.9-6.3 mL of 1+1 sulfuric acid in a second reaction container, gradually adding the mixed solution under a high-speed stirring state, and stirring for 2-4 hours to obtain a flowable viscous polysilicic acid liquid B;
4) adding the high-temperature uncooled liquid A into the liquid B in the second reaction vessel, uniformly stirring, adding one or more of fly ash, aluminum sulfate, diatomite and white carbon black, uniformly stirring, and cooling under stirring to obtain the massive solid polysilicate metal salt-polyaluminium coagulant.
2. The process for preparing the solid polysilicic acid metal salt-polyaluminium coagulant according to claim 1, wherein the other preparation step of the step 3) is as follows: adding 10mL of water into a second reaction container, adding 10g of water glass into the water, stirring for 10-20 min until the mixture is completely uniform, adding one or more of ferrous sulfate, aluminum chloride, ferric chloride, magnesium chloride and zinc chloride, stirring for 2-4 h, adding 5-6 mL of 1+1 sulfuric acid, and stirring for 20-30 min to obtain a liquid B.
3. The process according to claim 1, wherein in the step 4), the solid polysilicate metal-polyaluminium coagulant is used in wastewater treatment, and the treated incineration fly ash is repeatedly used for preparing the solid polysilicate metal-polyaluminium coagulant, so that the circulation is performed.
4. A preparation process of a solid polysilicate metal-polyaluminium coagulant is characterized in that the coagulant mainly comprises the following components: 27-200 parts of aluminum chloride, 14.5-52 parts of quick lime, 11.7-36 parts of hydrated lime, 11.3-36 parts of sodium carbonate, 16-67 parts of sodium hydroxide, 3-29 parts of potassium hydroxide, 1-300 parts of water, 1-60 parts of sulfuric acid, 1-200 parts of fly ash and 3-70 parts of water glass; the preparation process mainly comprises the following steps:
1) firstly, preparing acid liquor C:
firstly, washing fly ash and water according to a liquid-solid ratio of 10:1, wherein the leaching time is 24-48 h;
② leaching solution: preparing mixed acid by adopting sulfuric acid and hydrochloric acid or nitric acid, and preparing leaching solution by adopting the mixed acid and water 1+ 1;
mixing the fly ash and the leaching solution for leaching experiment, wherein the leaching time is 48-96 h, filtering, naturally drying the filter residue D, and obtaining filtrate as acid solution C;
2) taking aluminum chloride as a main raw material and quicklime, slaked lime, sodium carbonate, sodium hydroxide and potassium hydroxide as auxiliary raw materials to react and synthesize polyaluminum chloride;
3) firstly, 95.61-100.75 g of polyaluminium chloride and 9.7-11.0 mL of water are added into a reaction kettle, high-speed stirring is changed into flexible stirring at the temperature of 55-80 ℃, and the mixture reacts for 12-24 hours to obtain flowable viscous liquid E, so that the instant temperature is kept without cooling;
4) mixing 12.5-12.7 g of water glass with 12.3-13.1 mL of water in a first reaction container to form a mixed solution, then adding 10-12 mL of acid solution C in a second reaction container, gradually adding the mixed solution under a high-speed stirring state, and stirring for 2-4 hours to obtain a flowable viscous polysilicic acid liquid F;
5) and adding the high-temperature uncooled liquid E into the liquid F in the second reaction vessel, uniformly stirring, adding the filter residue D, uniformly stirring, and cooling under stirring to obtain the massive solid polysilicate metal salt-polyaluminium coagulant.
5. The process for preparing the solid polysilicic acid metal salt-polyaluminium coagulant according to claim 4, wherein the other preparation step of the step 4) is: adding 12.3-13.1 mL of water into a second reaction container, adding 12.5-12.7 g of water glass into the water, stirring for 10-20 min until the mixture is completely uniform, adding one or more of ferrous sulfate, aluminum chloride, ferric chloride, magnesium chloride and zinc chloride, stirring for 2-4 h, adding 10-12 mL of acid liquor C, and stirring for 20-30 min to obtain a liquid F.
6. The process according to claim 4, wherein in the step 5), the solid polysilicate metal-polyaluminium coagulant is used in wastewater treatment, and the treated incineration fly ash is repeatedly used for preparing the solid polysilicate metal-polyaluminium coagulant, so that the circulation is performed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101698484A (en) * | 2009-10-27 | 2010-04-28 | 南通立源水业科技发展有限公司 | Method for preparing multinuclear polysilicate flocculant |
| CN101712477A (en) * | 2009-10-27 | 2010-05-26 | 南通立源水业科技发展有限公司 | Method for preparing adsorption-coagulation-type polysilicate flocculating agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101698484A (en) * | 2009-10-27 | 2010-04-28 | 南通立源水业科技发展有限公司 | Method for preparing multinuclear polysilicate flocculant |
| CN101712477A (en) * | 2009-10-27 | 2010-05-26 | 南通立源水业科技发展有限公司 | Method for preparing adsorption-coagulation-type polysilicate flocculating agent |
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