CN109721092A - The preparation method and its gained aluminium polychloride and purposes of a kind of aluminium polychloride - Google Patents
The preparation method and its gained aluminium polychloride and purposes of a kind of aluminium polychloride Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title abstract description 20
- 239000004411 aluminium Substances 0.000 title abstract 6
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
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- 238000000034 method Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 14
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 67
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 59
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 41
- 239000007787 solid Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000004065 wastewater treatment Methods 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 239000008235 industrial water Substances 0.000 claims description 4
- 238000002036 drum drying Methods 0.000 claims description 2
- 238000001694 spray drying Methods 0.000 claims description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 10
- 239000002699 waste material Substances 0.000 abstract description 4
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 description 11
- 229910001845 yogo sapphire Inorganic materials 0.000 description 11
- 239000003245 coal Substances 0.000 description 10
- 239000005997 Calcium carbide Substances 0.000 description 8
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 8
- 239000002351 wastewater Substances 0.000 description 8
- 238000004939 coking Methods 0.000 description 6
- 229910001570 bauxite Inorganic materials 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- -1 aluminum ions Chemical class 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
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- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of preparation method of aluminium polychloride and its gained aluminium polychloride and purposes.This method comprises: aluminous fly-ash is added in hydrochloric acid carries out dissolution reaction, liquor alumini chloridi is obtained；Carbide slag or calcium hydroxide are added in liquor alumini chloridi, adjusts pH value=3.5~5.0, carries out polymerization reaction, obtains liquid aluminium polychloride, temperature when polymerization reaction is 40~110 DEG C.It is higher that the present invention uses aluminous fly-ash to carry out aluminium ion concentration in dissolution reaction gained dissolution fluid, mass fraction index meets standard GB/T/T 22627-2014, without additional addition aluminium-containing substance such as calcium aluminate in polymerization reaction, it only needs to be added carbide slag/calcium hydroxide and adjusts pH value, reduce the consumption to aluminum ore, reduce production cost, realizes comprehensive utilization of waste materials；Temperature reaches 40 DEG C when polymerization, and polymeric reaction condition requires to reduce, and the amount of required carbide slag/calcium hydroxide is considerably less.
Description
Technical Field
The invention relates to the technical field of preparation of inorganic high-molecular coagulants, in particular to a preparation method of polyaluminium chloride, the polyaluminium chloride obtained by the preparation method and application of the polyaluminium chloride.
Background
Polyaluminum chloride is abbreviated as polyaluminum, and is abbreviated as PAC (polyaluminum chloride), which is between AlCl3And Al (OH)3A water-soluble inorganic high molecular polymer with a chemical general formula of [ Al2(OH)nCl6-n·xH2O]m(m is 10 or less, n is 1 to 5) byAs an inorganic high-molecular coagulant, the water-purifying agent is a new water-purifying material. The polyaluminium chloride used for water treatment has the advantages of good stability, wide water adaptation range, high hydrolysis speed, strong adsorption capacity, large formed alumen ustum, high dense precipitation speed, low effluent turbidity, good dehydration performance and the like.
The existing preparation process of polyaluminium chloride is to carry out dissolution reaction on bauxite and hydrochloric acid, and then carry out polymerization reaction on the obtained aluminum chloride solution and calcium aluminate to prepare the polyaluminium chloride. Wherein the calcium aluminate component is Al2O3And CaO, wherein Al2O3The content of aluminum in the reaction solution can be increased, and CaO can increase the pH value of the reaction solution, so that the reactants can be easily subjected to polymerization reaction. However, in this process, the content of aluminum obtained by the dissolution reaction of bauxite with hydrochloric acid is not high, and the mass fraction of alumina is generally less than 6% if it is converted from alumina as a standard. Therefore, it is necessary to further supplement the aluminum content in the polymerization reaction, and the above process is due to the fact that the calcium aluminate component is Al2O3The content of aluminum is increased during the polymerization reaction. In addition, the reaction requires a large amount of calcium aluminate, which is formed by sintering calcium oxide and alumina at a high temperature, and consumes a large amount of aluminum ore, resulting in high production costs.
Fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from coal-fired power plants. The main oxide composition of the fly ash of the thermal power plant in China is as follows: SiO 22、Al2O3、FeO、Fe2O3、CaO、TiO2And the like. Al in high-alumina fly ash2O3Has a relatively high content of Al2O3Is generally higher than 35%. Along with the development of the power industry, the discharge amount of fly ash of coal-fired power plants is increased year by year, and the fly ash becomes one of industrial waste residues with larger discharge amount in China. A large amount of fly ash can generate dust without treatment, thereby polluting the atmosphere; if discharged into a water system, the river can be silted, and toxic chemicals in the river can cause harm to human bodies and organisms.
Carbide slag, also known as calcium carbide slagCalcium carbide mud, Ca (OH) after acetylene gas is obtained by calcium carbide hydrolysis2The calcium carbide slag is the waste slag which is the main component, most PVC manufacturers separate calcium carbide slag slurry through gravity settling, supernatant is recycled, the calcium carbide slag is further dehydrated, the water content of the calcium carbide slag still reaches 40% -50%, the calcium carbide slag is pasty, the calcium carbide slag is easy to leak and pollute road surfaces in the transportation process, and long-term accumulation not only occupies a large amount of land, but also has a serious erosion effect on the land. Therefore, in order to solve the problems fundamentally, only technological breakthrough is made, a new treatment process is sought, comprehensive utilization is realized, harm is turned into benefit, and waste is turned into wealth.
Aiming at the problems of low aluminum content, high aluminum ore consumption and high production cost in the dissolution reaction in the prior art, the invention provides a method for preparing polyaluminum chloride by using high-alumina fly ash and carbide slag.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a preparation method of polyaluminium chloride, which can solve the problems that in the existing preparation process of the polyaluminium chloride, an aluminum-containing raw material needs to be further added in a polymerization reaction, the consumption of aluminum ore is high, and the production cost is high.
In order to achieve the above object, the present invention provides a method for preparing polyaluminum chloride, comprising the steps of:
(1) adding high-alumina fly ash into hydrochloric acid with the mass percentage concentration of 10-30% to perform dissolution reaction to obtain an aluminum chloride solution with the mass percentage concentration of 18-36%; wherein the temperature of the dissolution reaction is 70-100 ℃, the time of the dissolution reaction is 0.5-5 h, and the mass ratio of the hydrochloric acid to the high-alumina fly ash is 1: 0.2-1.2;
(2) adding carbide slag or calcium hydroxide into the aluminum chloride solution obtained in the step (1), adjusting the pH value to be 3.5-5.0, and carrying out polymerization reaction to obtain liquid polyaluminum chloride; wherein the temperature during the polymerization reaction is 40-110 ℃, the time of the polymerization reaction is 0.5-5 h, the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.05-0.25, and the mass ratio of the aluminum chloride solution to the calcium hydroxide is 1: 0.05-0.25.
In a preferred embodiment, the liquid polyaluminium chloride obtained in step (2) is further dried to obtain solid polyaluminium chloride.
In a preferred embodiment, the drying is drum drying or spray drying.
In a preferred embodiment, in step (1), Al in the high-alumina fly ash is2O3The mass fraction of (A) is more than or equal to 35%.
In a preferred embodiment, in step (1), the mass ratio of the hydrochloric acid to the high-alumina fly ash is 1: 0.5.
In a preferred embodiment, in the step (2), the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.15.
In a preferred embodiment, in the step (2), the mass ratio of the aluminum chloride solution to the calcium hydroxide is 1: 0.15.
Another object of the present invention is to provide a polyaluminum chloride prepared by any of the above preparation methods, wherein the liquid polyaluminum chloride contains Al2O3The mass fraction of the aluminum chloride is 6 to 14 percent, and Al in the solid polyaluminium chloride2O3The mass fraction of (B) is 28-31%.
It is another object of the present invention to provide the use of any of the above polyaluminium chlorides as a flocculating agent.
Another object of the present invention is to provide the use of any one of the above polyaluminium chlorides for domestic water treatment, industrial water treatment, municipal sewage treatment and wastewater treatment; wherein,
when the solid polyaluminium chloride is used for treating domestic water, the dosage of the solid polyaluminium chloride is 2.5-25 kg per thousand tons of water;
when the solid polyaluminium chloride is used for treating industrial water, the adding amount of the solid polyaluminium chloride is 2.5-25 kg/thousand tons of water;
when the solid polyaluminium chloride is used for treating urban sewage, the adding amount of the solid polyaluminium chloride is 15-50 kg/thousand tons of water;
when the solid polyaluminium chloride is used for wastewater treatment, the dosage of the solid polyaluminium chloride is 20-300 kg/thousand tons of water.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the high-alumina fly ash to carry out the dissolution reaction, and does not adopt bauxite to carry out the dissolution reaction, the concentration of aluminum chloride in the solution reaction liquid obtained by the high-alumina fly ash and hydrochloric acid is higher, the mass fraction can reach 18 to 36 percent, and is higher than the mass fraction of the aluminum chloride in the solution obtained by the existing dissolution reaction adopting bauxite by 15.6 percent, therefore, the concentration of aluminum ions in the dissolution liquid obtained by the dissolution reaction by adopting the high-alumina fly ash is higher, and the aluminum ions in the dissolution liquid obtained by the dissolution reaction by adopting the high-alumina fly ash are higher according to the formula of2O3) The mass fraction of the alumina reaches 7-14 percent by conversion, and the mass fraction index meets the requirement (more than or equal to 6.0 percent) of the mass fraction of the alumina in the polyaluminium chloride in the national standard GB/T22627-2014 (water treatment agent polyaluminium chloride), so that an aluminum-containing substance such as calcium aluminate is not required to be additionally added in the second step of polymerization reaction to increase the content of the aluminum, only alkali is required to be added to adjust the pH value, the consumption of aluminum ore is greatly reduced, and the production cost is greatly reduced.
(2) Because other aluminum-containing substances such as calcium aluminate are not adopted in the polymerization reaction, and only carbide slag or calcium hydroxide is adopted, the temperature during polymerization is up to 40 ℃, and the minimum temperature of the calcium aluminate participating in the polymerization reaction is 80 ℃, so that the reaction temperature required by the polymerization reaction is lower than that of the calcium aluminate participating in the polymerization reaction, the requirement on the polymerization reaction condition is reduced, and the production cost is indirectly reduced; in addition, the amount of the adopted carbide slag or calcium hydroxide is very small, the mass ratio of the aluminum chloride solution to the carbide slag or the calcium hydroxide is 1: 0.05-0.25, and the hydrogen bond bridging effect of the polymeric aluminum ions is enhanced only for adjusting the basicity so as to form macromolecular polyaluminium chloride and promote the formation of the polyaluminium chloride.
(3) The invention adopts the high-alumina fly ash and the carbide slag, realizes the comprehensive utilization of wastes, solves the problems of environmental pollution and the like caused by the existing stockpiling of the high-alumina fly ash and the carbide slag, and greatly reduces the production cost of the polyaluminium chloride.
(4) The polyaluminium chloride prepared by the method has almost the same capacity of treating wastewater as the polyaluminium chloride prepared by the existing bauxite and calcium aluminate under the condition of greatly reducing the cost.
Drawings
FIG. 1 is a flow chart of a process for preparing polyaluminum chloride according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.
The following examples of this application use high alumina fly ash from: coal of Zhuozi mountain coal series in the west of inner Mongolia, fly ash after combustion, and method for producing the sameMiddle Al2O3Is 38%.
The following examples of the present application employ carbide slag from: carbide slag from polyvinyl chloride (PVC) chemical plants around the interior Mongolia Ughai, where Ca (OH)2The mass fraction of (b) was 84.6%.
Example 1: preparation method of polyaluminum chloride
The method comprises the following specific steps:
(1) adding Al into hydrochloric acid with the mass percent concentration of 20 percent2O3The high-alumina fly ash with the mass fraction of 38% is subjected to dissolution reaction to obtain an aluminum chloride solution with the mass percentage concentration of 26%; wherein the temperature of the dissolution reaction is 85 ℃, the time of the dissolution reaction is 3.5h, and the mass ratio of the hydrochloric acid to the high-alumina fly ash is 1: 0.8;
(2) adding carbide slag into the obtained aluminum chloride solution, adjusting the pH value to be 4.0, and carrying out polymerization reaction to obtain liquid polyaluminum chloride; wherein the temperature in the polymerization reaction is 60 ℃, the time of the polymerization reaction is 3h, and the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.15.
In the obtained liquid polyaluminium chloride product, Al2O3The mass fraction of (A) was 10%, the basicity was 75, and the pH was 3.9.
Example 2: preparation method of polyaluminum chloride
The method comprises the following specific steps:
(1) adding Al into hydrochloric acid with the mass percent concentration of 12%2O3The high-alumina fly ash with the mass fraction of 38% is subjected to dissolution reaction to obtain an aluminum chloride solution with the mass percentage concentration of 24%; wherein the temperature of the dissolution reaction is 100 ℃, the time of the dissolution reaction is 5h, and the hydrochloric acid and the high-alumina fly ashThe mass ratio of (A) to (B) is 1: 0.4;
(2) adding carbide slag into the obtained aluminum chloride solution, adjusting the pH value to be 3.5, and carrying out polymerization reaction to obtain liquid polyaluminum chloride; wherein the temperature in the polymerization reaction is 100 ℃, the time of the polymerization reaction is 4.5h, and the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.10.
In the obtained polyaluminium chloride product, Al2O3The mass fraction of (B) was 7%, the basicity was 53, and the pH was 3.8.
Example 3: preparation method of polyaluminum chloride
The method comprises the following specific steps:
(1) adding Al into hydrochloric acid with the mass percent concentration of 25 percent2O3The high-alumina fly ash with the mass fraction of 38% is subjected to dissolution reaction to obtain an aluminum chloride solution with the mass percentage concentration of 30%; wherein the temperature of the dissolution reaction is 70 ℃, the time of the dissolution reaction is 5h, and the mass ratio of the hydrochloric acid to the high-alumina fly ash is 1: 1.2;
(2) adding carbide slag into the obtained aluminum chloride solution, adjusting the pH value to be 5.0, and carrying out polymerization reaction to obtain liquid polyaluminum chloride; wherein the temperature in the polymerization reaction is 70 ℃, the time of the polymerization reaction is 1.5h, and the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.25.
In the obtained polyaluminium chloride product, Al2O3The mass fraction of (A) was 11.5%, the basicity was 90 and the pH was 4.8.
Example 4: preparation method of polyaluminum chloride
The method comprises the following specific steps:
(1) adding Al into hydrochloric acid with the mass percent concentration of 25 percent2O3Mass ofCarrying out dissolution reaction on 38% high-alumina fly ash to obtain 30% aluminum chloride solution; wherein the temperature of the dissolution reaction is 70 ℃, the time of the dissolution reaction is 5h, and the mass ratio of the hydrochloric acid to the high-alumina fly ash is 1: 1.2;
(2) adding calcium hydroxide into the obtained aluminum chloride solution, adjusting the pH value to be 5.0, and carrying out polymerization reaction to obtain liquid polyaluminum chloride; wherein the temperature of the polymerization reaction is 70 ℃, the time of the polymerization reaction is 1.5h, and the mass ratio of the aluminum chloride solution to the calcium hydroxide is 1: 0.15.
In the obtained polyaluminium chloride product, Al2O3The mass fraction of (B) was 10%, the basicity was 91, and the pH was 4.9.
Example 5: drying treatment method
And (2) drying the liquid polyaluminium chloride obtained in the example 1 by adopting a roller dryer under the condition that 0.6MPa of saturated steam with the temperature of 160 ℃ is introduced into the roller to obtain solid polyaluminium chloride.
Wherein Al in the obtained solid polyaluminium chloride2O3Is 30% by mass.
Examples of the experiments
The following test objects, namely sewage before flocculation and sedimentation in a suburb sewage plant in the east-winner region of inner Mongolia Ordos city, coking wastewater of a Huayu coking plant in inner Mongolia Ordos city and certain coal mine drainage water in Shanxi, are used for carrying out wastewater treatment tests on the solid polyaluminum chloride obtained in example 5, and specific results are shown in tables 1, 2 and 3.
Table 1 wastewater treatment experiment-example of wastewater before flocculation and sedimentation in a Sewage treatment plant located in the suburb of the east-west region of Erdos, inner Mongolia
According to the regulation of pollutant discharge standard in integrated wastewater discharge standard (GB8978-1996), SS (suspended substance) in the wastewater before flocculation and sedimentation after treatment is lower than 10mg/L and meets the national first-class discharge standard; the COD (chemical oxygen demand) content after treatment is less than 40mg/L, which meets the requirements of common landscape water; the TP (total phosphorus) after treatment is lower than 0.5mg/L, and meets the primary standard of middle-grade total phosphorus emission.
TABLE 2 wastewater treatment experiments-example of coking wastewater from Huayu coking plant of Ordos city, inner Mongolia
As can be seen from Table 2, when the adding amount is 250mg/L, the SS (suspended substance) in the treated coking wastewater is lower than 20mg/L, the treated coking wastewater meets the national first-class discharge standard, and the treatment rate reaches 95 percent; the COD (chemical oxygen demand) content after treatment is less than 1050mg/L, and the treatment rate reaches 85 percent; the ammonia nitrogen after treatment is lower than 40mg/L, and the treatment rate also reaches 80 percent.
Table 3 wastewater treatment experiment, taking the drainage of certain coal mine in Shaanxi as an example
Coal mine drainage is a water body which is gushed out of a coal seam in the coal mining process. As can be seen from Table 3, when the addition amount is 100mg/L, the SS (suspended solids) in the treated coal mine drainage water is lower than 25mg/L, the treated coal mine drainage water meets the national secondary emission standard, and the treatment rate reaches 94%; the COD (chemical oxygen demand) content after treatment is less than 55mg/L, and the treatment rate reaches 86%; the total lead after treatment is less than 0.4mg/L, and the treatment rate also reaches 78%.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The preparation method of the polyaluminium chloride is characterized by comprising the following steps:
(1) adding high-alumina fly ash into hydrochloric acid with the mass percentage concentration of 10-30% to perform dissolution reaction to obtain an aluminum chloride solution with the mass percentage concentration of 18-36%; wherein the temperature of the dissolution reaction is 70-100 ℃, the time of the dissolution reaction is 0.5-5 h, and the mass ratio of the hydrochloric acid to the high-alumina fly ash is 1: 0.2-1.2;
(2) adding carbide slag or calcium hydroxide into the aluminum chloride solution obtained in the step (1), adjusting the pH value to be 3.5-5.0, and carrying out polymerization reaction to obtain liquid polyaluminum chloride; wherein the temperature during the polymerization reaction is 40-110 ℃, the time of the polymerization reaction is 0.5-5 h, the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.05-0.25, and the mass ratio of the aluminum chloride solution to the calcium hydroxide is 1: 0.05-0.25.
2. The method according to claim 1, wherein in the step (1), Al in the high-alumina fly ash is contained2O3The mass fraction of (A) is more than or equal to 35%.
3. The method according to claim 1, wherein in the step (1), the mass ratio of the hydrochloric acid to the high alumina fly ash is 1: 0.5.
4. The preparation method according to claim 1, wherein in the step (2), the mass ratio of the aluminum chloride solution to the carbide slag is 1: 0.15.
5. The production method according to claim 1, wherein in the step (2), the mass ratio of the aluminum chloride solution to the calcium hydroxide is 1: 0.15.
6. The method according to claim 1, wherein the liquid polyaluminum chloride obtained in step (2) is further dried to obtain a solid polyaluminum chloride.
7. The method of claim 6, wherein the drying is drum drying or spray drying.
8. Polyaluminium chloride produced by the method of any one of claims 1 to 7, wherein Al in the liquid polyaluminium chloride is2O3Mass fraction of6 to 14 percent of Al in the solid polyaluminium chloride2O3The mass fraction of (B) is 28-31%.
9. Use of the polyaluminum chloride of claim 8 as a flocculant.
10. Use of the polyaluminum chloride of claim 8 as a flocculant for domestic water treatment, industrial water treatment, municipal sewage treatment, and wastewater treatment; wherein,
when the solid polyaluminium chloride is used for treating domestic water, the dosage of the solid polyaluminium chloride is 2.5-25 kg per thousand tons of water;
when the solid polyaluminium chloride is used for treating industrial water, the adding amount of the solid polyaluminium chloride is 2.5-25 kg/thousand tons of water;
when the solid polyaluminium chloride is used for treating urban sewage, the adding amount of the solid polyaluminium chloride is 15-50 kg/thousand tons of water;
when the solid polyaluminium chloride is used for wastewater treatment, the dosage of the solid polyaluminium chloride is 20-300 kg/thousand tons of water.
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