CN102344157A - Method for preparing aluminium polychlorid with high content of Al13 - Google Patents

Method for preparing aluminium polychlorid with high content of Al13 Download PDF

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CN102344157A
CN102344157A CN2010102412169A CN201010241216A CN102344157A CN 102344157 A CN102344157 A CN 102344157A CN 2010102412169 A CN2010102412169 A CN 2010102412169A CN 201010241216 A CN201010241216 A CN 201010241216A CN 102344157 A CN102344157 A CN 102344157A
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aluminum chloride
polymerize aluminum
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李小忠
苏晓梅
包建松
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Zhejiang Normal University CJNU
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Abstract

The invention relates to a method for preparing aluminium polychlorid with high content of Al13, which belongs to the technical field of environmental protection. The method is completed in the following way: the aluminium polychlorid with high content of Al13 is prepared by taking crystallized aluminium chloride, sodium hydroxide and sodium metaaluminate as raw materials. The method for preparing aluminium polychlorid with high content of Al13 comprises the following steps of: (1) taking and adding a certain amount of AlCl3 solution into a three-neck flask which is assembled with a stirring plug, a stirring rod and a condensation pipe, and heating in water bath at constant temperature; (2) taking a certain amount of NaOH solution to be preheated; (3) adding the preheated NaOH solution into the AlCl3 solution, heating, stirring, reacting, and generating dimer Al2 and polymer Al6 after the reaction of NaOH and AlCl3; (4) adding NaAlO2 solution into the mixing solution of dimer Al2 and polymer Al6, heating, stirring and reacting; and (5) after a certain reacting time, obtaining the aluminium polychlorid finished product. The invention has the advantages of simple technology, low cost, high production efficiency, no secondary pollution, excellent aluminium polychlorid performance and long stabilization time.

Description

The high Al of a kind of preparation 13The method of content polymerize aluminum chloride
Technical field
The present invention relates to environmental technology field, particularly a kind of preparation is used for the high Al of sewage flocculation treatment 13The method of content polymerize aluminum chloride.
Technical background
In inorganic polymer flocculant, aluminium based flocculating agent kind is more, and preparation technology's method is comparatively ripe.Wherein polymerize aluminum chloride (Polyaluminium Chloride) is called for short PAC, is also referred to as aluminium chlorohydroxide usually, gathers oxyaluminum etc., is that the current industrial production technology is the most ripe, usefulness is the highest, uses kind the most widely.The polymerize aluminum chloride representative be not a certain specific mineral compound, but the general name of a series of inorganic polymers.Polymerize aluminum chloride is actually the intermediate product of hydrolysis-polymerization-precipitation process of controlling aluminium under certain condition, and its chemical form belongs to multinuclear hydroxo complex and inorganic macromolecule compound, and particulate matter in the water is played the efficient flocculating effect.
The development of polymerize aluminum chloride and exploitation start from the Japan in the later stage sixties; After this; Many research workers of states such as Europe, the U.S. and USSR (Union of Soviet Socialist Republics) have carried out a large amount of research and developments to its synthesis and preparation process, existing both at home and abroad number of patents and bibliographical information the preparation technology and the method for tens of kinds of polymerize aluminum chlorides.
Usually the method for preparing polymerize aluminum chloride has following several:
1, be the working method of raw material with aluminium or active aluminium sesquioxide
With aluminium or active aluminium sesquioxide (comprising aluminium bits, aluminium slag, aluminium ash and the active aluminium sesquioxide that is made by clay pit or calcined coal gangue) is the chemical process of raw material.A certain amount of aluminium or active aluminium sesquioxide are dissolved in hydrochloric acid, and along with the carrying out of reaction, the pH value of system raises gradually, and impels Al (H at a certain temperature 2O) 6 3+Hydrolysis and polyreaction take place.Can make the polymeric aluminum chlorides solution of finite concentration aluminium, certain basicity, certain polymerization degree.
Al in its product 13Content is lower, and owing to contain more detrimental impurity in the raw material, the PAC foreign matter content of its production is higher.
2, be the method for raw material with sodium aluminate or white lake.。
Sodium aluminate or white lake and hydrochloric acid are reacted the generation polymerize aluminum chloride by a certain percentage in reaction kettle.The working condition that this method is produced polymerize aluminum chloride requires High Temperature High Pressure, and cost is higher, and the Al in the product quality indicator 13Content can only reach 40～50%.
3, with the aluminum chloride be the working method of raw material.Common method mainly contains following four kinds:
1. electrolytic process
The ecological center of the Chinese Academy of Sciences is more to the research of this respect.Usually being anode with the aluminium sheet, is negative electrode with the stainless steel, and aluminum chloride is electrolytic solution, passes to direct current, under the condition of low pressure, high electric current, makes polymerize aluminum chloride.Developed a kind of technology of preparing of high-quality polymerize aluminum chloride like the ecological center of the Chinese Academy of Sciences; This technology is electrolytic solution with the aluminum chloride, and aluminium sheet is an anode, and iron plate is a negative electrode; Lead to the low voltage of certain hour, the direct current of big electric current, can make the liquid product of polymerize aluminum chloride.Though its basicity is higher, its composition Al that effectively flocculates 13Massfraction is about 70%.But this method is to be anode with the aluminium sheet; Most of aluminium is from the dissolving of anode aluminium sheet in the polymerize aluminum chloride of preparation; Cause the production cost of this method higher relatively, can't satisfy the needs of scale operation, and wherein still have 20%～40% aluminium to exist with aluminum ion and white lake form.
Teachers such as the Qu Jiuhui of Ecological Envionment Research Centre, Chinese Academy of Sciences go out the polymerize aluminum chloride that polymerization 13 aluminium account for total aluminium 60～90% with the dimensional stable anode electrolytic preparation.But electrolysis time is longer, and generally more than 10 hours, polymerization 13 aluminium are prone to the deposition cathode surface and cause electrode passivation, and electrolytic efficiency reduces, and polymerization 13 aluminium content remain further to be improved.
2. electroosmose process.
This method is to be electrolytic solution with the aluminum chloride, constitutes reaction chamber with two anion-exchange membranes (out-phase), and graphite cake is an anode, and monolithic porous is a negative electrode, and logical certain hour direct current promptly makes the PAC liquid product.Though this technology is advanced, the place one's entire reliance upon quality of ion-exchange membrane of this method complex process, the quality product of manufacturing exists easy generation film and pollute this thorny difficult problem, and the more expensive cost of PAC that causes of the price of film is higher.
3. thermal decomposition method
With the crystal aluminum chloride is raw material; Also can adopt the boiling pyrolysis method to make solid PAC; Crystal aluminum chloride is pyrolysis at a certain temperature; Decomposite hydrogenchloride and water; Polymerization becomes powdered product, and promptly PAC (grog) adds certain water gaging with grog and stirs; Be solidified into the resinousness product within a short period of time, through dry, pulverize get final product solid PAC product.
This method investment of production equipment is big, and decomposition efficiency is lower, and is prone to produce aluminium sesquioxide, and the polymerization degree of product is generally below 50%.
4. neutralisation.
In aluminum trichloride solution, add alkaline matters such as sodium hydroxide, lime, Wingdale, yellow soda ash, improve the concentration of hydroxide ion, promoting the hydrolysis of aluminum chloride, different add alkali number and can obtain different basicity products.The actual production of this method is wayward, can not realize the stoichiometric(al) of suitable basicity and effective aluminium component, and quality product is stable inadequately, Al 13Content is lower.The result of laboratory study is also not the same.It has been generally acknowledged that the Al of micro-alkali adding method (extremely slow add alkali speed) products obtained therefrom 13Massfraction can reach more than 80%, to have made total aluminium concentration be 0.59mol/L to Zhao Huazhang etc. through improving means such as temperature, Al 13Massfraction reach 80.7% product.But there is report to point out under the very low situation of aluminum concentration, slowly to add alkali and can not get Al abroad 13, under 90 ℃, can obtain Al on the contrary through adding alkali fast 13Massfraction be 100% PAC solution, in usefulness such as moonlight dropwise alkali adding method make polymerize aluminum chloride, the product that makes it is said Al 13Content is not high yet.
To sum up, existing preparation polymerize aluminum chloride method exists that cost is higher, product effective constituents A l 13Weak points such as not high, the easy generation pollution of lower, the total Al concentration of content.
Summary of the invention
The objective of the invention is to higher, the product effective constituents A l of existing cost in the existing preparation polymerize aluminum chloride method 13Lower, the total Al concentration of content is not high, be prone to produce weak point such as pollution, provides to have that cost is low, product effective constituents A l 13A kind of method for preparing high Al13 content polymerize aluminum chloride of advantages such as high, the total Al concentration of content is higher, pollution is few.
The high Al of a kind of preparation of the present invention 13The technical scheme that method adopted of content polymerize aluminum chloride is accomplished through following mode: prepare high Al 13It is raw material that the content polymerize aluminum chloride adopts crystal aluminum chloride, sodium hydroxide, sodium metaaluminate, prepares high Al 13The method of content polymerize aluminum chloride may further comprise the steps:
(1) gets a certain amount of AlCl 3Solution adds in the there-necked flask that stirring plug, stirring rod, prolong are housed, the water bath with thermostatic control heating;
(2) getting a certain amount of NaOH solution preheats;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, the heated and stirred reaction makes NaOH and AlCl 3Reaction generates dimer Al 2With polymer Al 6
(4) to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2Solution carries out the heated and stirred reaction;
(5) behind the reaction certain hour, obtain the polymerize aluminum chloride finished product.
Wherein the part principle of step (3), step (4) is seen following reaction:
Dimer Al 2, polymer Al 6Building-up reactions: AlCl 3+ NaOH → Al 2+ Al 6
Al 13Form reaction: Al 2+ Al 6+ Al (OH) 4 -→ Al 13
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, AlCl 3Solution is that employing concentration is the AlCl of 0.4～0.6mol/L 3Solution, the temperature of water bath with thermostatic control heating is 80～90 ℃.
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, NaOH solution is that employing concentration is the NaOH solution of 0.6～0.8mol/L, and pre-warmed temperature is 80～90 ℃.
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, the NaOH solution after preheating adds AlCl 3Amount in the solution is according to mole ratio n (AlCl 3): n (NaOH) is that 1: 1.5～1.6 ratio is confirmed.
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, the NaOH solution after preheating adds AlCl 3In the solution, the bath temperature of the heated and stirred reaction of being carried out is 80～90 ℃, and stirring velocity is 100～120r/min, and the time of heated and stirred reaction is 25～35min.
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2Solution is that employing concentration is the NaAlO of 0.2～0.4mol/L 2Solution is to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2The amount of solution is according to mole ratio n (AlCl 3): n (NaAlO 2) be that 1: 0.4～0.5 ratio is confirmed.
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2The method of solution is to adopt the method that slowly drips to carry out, and the bath temperature of the heated and stirred reaction of being carried out is 80～90 ℃, and stirring velocity is 130～150r/min, and the dropping time is 20～30min.
At the high Al of above-mentioned preparation 13In the method for content polymerize aluminum chloride, to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2After the dropwise reaction that solution carried out finishes, after continuing to react 5～10min, obtain Al 13Content>=97%, the liquid aluminium polychloride of steady time>=24 month.
The present invention is from Al 13Form this angle of principle and set out, by certain ratio NaOH is added AlCl earlier 3The pH value of regulator solution is with the Al of synthesizing octahedral structure in the solution 2And Al 6In solution, add a certain amount of NaAlO again 2Solution is because NaAlO 2In Al be Al (OH) with positive tetrahedron 4 -Form exists, can be as core, with the Al of the octahedral structure that generates in the solution 2And Al 6Reaction generates Al 13So not only passable obtain high Al 13The liquid aluminium polychloride of content, high Al total concn, and realized the efficient and rational utilization of resource, reduced and produced the environmental pollution that is caused in the polymerize aluminum chloride, meet the continuable development principle of " energy-saving and environmental protection ".
The present invention compares with the method for existing preparation polymerize aluminum chloride, has following outstanding feature:
1, simple, the low production cost of technical process, production efficiency are high, non-secondary pollution.
2, prepared polymerize aluminum chloride superior performance, wherein Al 13Content>=97%, basicity>=85%.Steady time >=24 of product month in addition.
Embodiment
Through embodiment the present invention is made further explanation below.
Embodiment 1
The high Al of a kind of preparation 13The method of content polymerize aluminum chloride, its preparation process is:
(1) gets a certain amount of 0.4mol/LAlCl 3Solution is in being equipped with the there-necked flask that stirs plug, stirring rod, prolong, and water bath with thermostatic control is heated to 90 ℃;
(2) according to mole ratio n (AlCl 3): n (NaOH) is 1: 1.5 a ratio, gets a certain amount of 0.6mol/L NaOH solution and preheats, and bath temperature is 90 ℃;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, heated and stirred, bath temperature is 90 ℃, stirring velocity is 100r/min;
(4) behind the question response 35min, according to mole ratio n (AlCl 3): n (NaAlO 2) be 1: 0.5 ratio, get a certain amount of 0.2mol/LNaAlO 2Solution slowly is added drop-wise in the mixing solutions, heated and stirred, and bath temperature is 90 ℃, and stirring velocity is 130r/min, and the dropping time is 30min;
(5) treat that dropwise reaction finishes after, continue reaction 5min, promptly get the liquid aluminium polychloride finished product.
The liquid aluminium polychloride finished product is carried out absorbance measurement, and the form of calculating Al distributes.The result is: Al in the polymerize aluminum chloride finished product 13Content is 94.20%, and basicity is 85.3%.
Embodiment 2
The high Al of a kind of preparation 13The method of content polymerize aluminum chloride, its preparation process is:
(1) gets a certain amount of 0.5mol/LAlCl 3Solution is in being equipped with the there-necked flask that stirs plug, stirring rod, prolong, and water bath with thermostatic control is heated to 85 ℃;
(2) according to mole ratio n (AlCl 3): n (NaOH) is 1: 1.6 a ratio, gets a certain amount of 0.8mol/L NaOH solution and preheats, and bath temperature is 85 ℃;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, heated and stirred, bath temperature is 85 ℃, stirring velocity is 120r/min;
(4) behind the question response 30min, according to mole ratio n (AlCl 3): n (NaAlO 2) be 1: 0.4 ratio, get a certain amount of 0.4mol/LNaAlO 2Solution slowly is added drop-wise in the mixing solutions, heated and stirred, and bath temperature is 85 ℃, and stirring velocity is 150r/min, and the dropping time is 20min;
(5) treat that dropwise reaction finishes after, continue reaction 10min, promptly get the liquid aluminium polychloride finished product.
The liquid aluminium polychloride finished product is carried out absorbance measurement, and the form of calculating Al distributes.The result is: Al in the polymerize aluminum chloride finished product 13Content is 97.40%, and basicity is 86.7%.
Embodiment 3
The high Al of a kind of preparation 13The method of content polymerize aluminum chloride, its preparation process is:
(1) gets a certain amount of 0.6mol/LAlCl 3Solution is in being equipped with the there-necked flask that stirs plug, stirring rod, prolong, and water bath with thermostatic control is heated to 80 ℃;
(2) according to mole ratio n (AlCl 3): n (NaOH) is 1: 1.55 a ratio, gets a certain amount of 0.7mol/L NaOH solution and preheats, and bath temperature is 80 ℃;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, heated and stirred, bath temperature is 80～90 ℃, stirring velocity is 110r/min;
(4) behind the question response 25min, according to mole ratio n (AlCl 3): n (NaAlO 2) be 1: 0.45 ratio, get a certain amount of 0.3mol/LNaAlO 2Solution slowly is added drop-wise in the mixing solutions, heated and stirred, and bath temperature is 80 ℃, and stirring velocity is 140r/min, and the dropping time is 25min;
(5) treat that dropwise reaction finishes after, continue reaction 8min, promptly get the liquid aluminium polychloride finished product.
The liquid aluminium polychloride finished product is carried out absorbance measurement, and the form of calculating Al distributes.The result is: Al in the polymerize aluminum chloride finished product 13Content is 95.10%, and basicity is 85.8%.
Embodiment 4
The high Al of a kind of preparation 13The method of content polymerize aluminum chloride, its preparation process is:
(1) gets a certain amount of 0.45mol/LAlCl 3Solution is in being equipped with the there-necked flask that stirs plug, stirring rod, prolong, and water bath with thermostatic control is heated to 90 ℃;
(2) according to mole ratio n (AlCl 3): n (NaOH) is 1: 1.6 a ratio, gets a certain amount of 0.7mol/L NaOH solution and preheats, and bath temperature is 90 ℃;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, heated and stirred, bath temperature is 90 ℃, stirring velocity is 120r/min;
(4) behind the question response 35min, according to mole ratio n (AlCl 3): n (NaAlO 2) be 1: 0.5 ratio, get a certain amount of 0.4mol/LNaAlO 2Solution slowly is added drop-wise in the mixing solutions, heated and stirred, and bath temperature is 90 ℃, and stirring velocity is 150r/min, and the dropping time is 30min;
(5) treat that dropwise reaction finishes after, continue reaction 10min, promptly get the liquid aluminium polychloride finished product.
The liquid aluminium polychloride finished product is carried out absorbance measurement, and the form of calculating Al distributes.The result is: Al in the polymerize aluminum chloride finished product 13Content is 96.10%, and basicity is 86.4%.
Embodiment 5
The high Al of a kind of preparation 13The method of content polymerize aluminum chloride, its preparation process is:
(1) gets a certain amount of 0.55mol/LAlCl 3Solution is in being equipped with the there-necked flask that stirs plug, stirring rod, prolong, and water bath with thermostatic control is heated to 80 ℃;
(2) according to mole ratio n (AlCl 3): n (NaOH) is 1: 1.5 a ratio, gets a certain amount of 0.6mol/L NaOH solution and preheats, and bath temperature is 80 ℃;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, heated and stirred, bath temperature is 80～90 ℃, stirring velocity is 100r/min;
(4) behind the question response 30min, according to mole ratio n (AlCl 3): n (NaAlO 2) be 1: 0.4 ratio, get a certain amount of 0.2NaAlO 2Solution slowly is added drop-wise in the mixing solutions, heated and stirred, and bath temperature is 80 ℃, and stirring velocity is 140r/min, and the dropping time is 25min;
(5) treat that dropwise reaction finishes after, continue reaction 5min, promptly get the liquid aluminium polychloride finished product.
The liquid aluminium polychloride finished product is carried out absorbance measurement, and the form of calculating Al distributes.The result is: Al in the polymerize aluminum chloride finished product 13Content is 94.50%, and basicity is 85.9%.
Embodiment 6
The high Al of a kind of preparation 13The method of content polymerize aluminum chloride, its preparation process is:
(1) gets a certain amount of 0.6mol/LAlCl 3Solution is in being equipped with the there-necked flask that stirs plug, stirring rod, prolong, and water bath with thermostatic control is heated to 85 ℃;
(2) according to mole ratio n (AlCl 3): n (NaOH) is 1: 1.57 a ratio, gets a certain amount of 0.65mol/L NaOH solution and preheats, and bath temperature is 85 ℃;
(3) the NaOH solution after will preheating adds AlCl 3In the solution, heated and stirred, bath temperature is 85 ℃, stirring velocity is 110r/min;
(4) behind the question response 25min, according to mole ratio n (AlCl 3): n (NaAlO 2) be 1: 0.45 ratio, get a certain amount of 0.25mol/LNaAlO 2Solution slowly is added drop-wise in the mixing solutions, heated and stirred, and bath temperature is 85 ℃, and stirring velocity is 150r/min, and the dropping time is 25min;
(5) treat that dropwise reaction finishes after, continue reaction 10min, promptly get the liquid aluminium polychloride finished product.
The liquid aluminium polychloride finished product is carried out absorbance measurement, and the form of calculating Al distributes.The result is: Al in the polymerize aluminum chloride finished product 13Content is 96.80%, and basicity is 87.3%.

Claims (8)

1. one kind prepares high Al 13The method of content polymerize aluminum chloride is characterized in that: prepare high Al 13The raw material of content polymerize aluminum chloride adopts crystal aluminum chloride, sodium hydroxide, sodium metaaluminate, prepares high Al 13The step of content polymerize aluminum chloride is following:
(1) gets a certain amount of AlC L3Solution adds in the there-necked flask that stirring plug, stirring rod, prolong are housed, the water bath with thermostatic control heating;
(2) getting a certain amount of NaOH solution preheats;
(3) the NaOH solution after will preheating adds AlC L3In the solution, the heated and stirred reaction makes NaOH and AlC L3Reaction generates dimer Al 2With polymer Al 6
(4) to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2Solution carries out the heated and stirred reaction;
(5) behind the reaction certain hour, obtain the polymerize aluminum chloride finished product.
2. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: AlCl 3Solution is that employing concentration is the AlCl of 0.4～0.6mol/L 3Solution, the temperature of water bath with thermostatic control heating is 80～90 ℃.
3. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: NaOH solution is that employing concentration is the NaOH solution of 0.6～0.8mol/L, and pre-warmed temperature is 80～90 ℃.
4. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: the NaOH solution after preheating adds AlCl 3Amount in the solution is according to mole ratio n (AlCl 3): n (NaOH) is that 1: 1.5～1.6 ratio is confirmed.
5. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: the NaOH solution after preheating adds AlCl 3In the solution, the bath temperature of the heated and stirred reaction of being carried out is 80～90 ℃, and stirring velocity is 100～120r/min, and the time of heated and stirred reaction is 25～35min.
6. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2Solution is that employing concentration is the NaAlO of 0.2～0.4mol/L 2Solution is to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2The amount of solution is according to mole ratio n (AlCl 3): n (NaAlO 2) be that 1: 0.4～0.5 ratio is confirmed.
7. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2The method of solution is to adopt the method that slowly drips to carry out, and the bath temperature of the heated and stirred reaction of being carried out is 80～90 ℃, and stirring velocity is 130～150r/min, and the dropping time is 20～30min.
8. the high Al of a kind of preparation according to claim 1 13The method of content polymerize aluminum chloride is characterized in that: to dimer Al 2With polymer Al 6Mixing solutions in add NaAlO 2After the dropwise reaction that solution carried out finishes, after continuing to react 5～10min, obtain Al 13Content>=97%, the liquid aluminium polychloride of steady time>=24 month.
CN2010102412169A 2010-07-30 2010-07-30 Method for preparing aluminium polychlorid with high content of Al13 Expired - Fee Related CN102344157B (en)

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Publication number Priority date Publication date Assignee Title
CN112624169A (en) * 2021-01-12 2021-04-09 中国铝业股份有限公司 High-basicity polyaluminium chloride and preparation method thereof
CN114735737A (en) * 2022-04-01 2022-07-12 武汉鸿劲金属铝业有限公司 Method for preparing polyaluminum chloride co-production baking-free environment-friendly brick from aluminum ash
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CN115724451B (en) * 2022-10-21 2024-02-02 杭州萧山三江净水剂有限公司 Preparation method and application of polyaluminum chloride flocculant suitable for dephosphorization of down product processing wastewater

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