CN113786674A - Process for preparing filter material from tailings of production of polyaluminium chloride by calcining activated kaolin - Google Patents
Process for preparing filter material from tailings of production of polyaluminium chloride by calcining activated kaolin Download PDFInfo
- Publication number
- CN113786674A CN113786674A CN202111138361.9A CN202111138361A CN113786674A CN 113786674 A CN113786674 A CN 113786674A CN 202111138361 A CN202111138361 A CN 202111138361A CN 113786674 A CN113786674 A CN 113786674A
- Authority
- CN
- China
- Prior art keywords
- filter
- calcining
- polymerization reaction
- kaolin
- tailings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical class O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000001354 calcination Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 20
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 28
- 238000012216 screening Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 18
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 18
- 239000008187 granular material Substances 0.000 claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000001694 spray drying Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/02—Loose filtering material, e.g. loose fibres
- B01D39/06—Inorganic material, e.g. asbestos fibres, glass beads or fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to the technical field of filter material preparation processes, in particular to a process for preparing a filter material by calcining tailings of polyaluminium chloride from active kaolin, which comprises the steps of selecting hard active kaolin as a raw material, crushing and screening the raw material according to the specification of the filter material to be prepared to form a granular material meeting the standard, calcining the granular material at the temperature of more than 850 ℃, keeping the temperature and cooling, adding the granular material into a polymerization reaction tank containing hydrochloric acid with the content of at least 30% for reaction, carrying out solid-liquid separation by using a plate-and-frame filter press, carrying out polymerization reaction on separated primary liquid, filtering by using the plate-and-frame filter press, and drying and screening filter cakes filtered by two reactions to obtain the required filter material.
Description
Technical Field
The invention relates to the technical field of filter material preparation processes, in particular to a process for preparing a filter material by using tailings of production of polyaluminium chloride by calcining activated kaolin.
Background
Polyaluminium chloride is a novel water purification material, and in the process of producing the polyaluminium chloride by utilizing activated kaolin, applicants find that the generated tailings have a good water filtering effect, and through the adjustment of partial procedures in the production process of producing the polyaluminium chloride, the finally prepared filter material has a better using effect compared with a commonly used quartz sand filter material.
Disclosure of Invention
The invention provides a process for preparing a filter material from tailings of production of polyaluminium chloride by calcining active kaolin, which comprises the steps of selecting hard active kaolin as a raw material, crushing and screening the raw material according to the specification of the filter material to be prepared to form a granular material meeting the standard, calcining the granular material at the temperature of over 850 ℃, keeping the temperature, cooling, adding the granular material into a polymerization reaction tank containing hydrochloric acid with the content of at least 30% for reaction, carrying out solid-liquid separation by using a plate-and-frame filter press, carrying out polymerization reaction on separated primary liquid, filtering by using the plate-and-frame filter press, and drying and screening filter cakes filtered by the two reactions to obtain the required filter material.
The invention provides a process for preparing a filter material by using tailings of production of polyaluminium chloride by calcining activated kaolin, which comprises the following steps:
s1: selecting and crushing materials, namely selecting active kaolin traditionally used for polyaluminium chloride production as a raw material, crushing the raw material by using a crusher, and screening out 5-8mm granules by using a drum screen for storage;
s2: calcining, namely conveying the qualified granules screened out by the S1 to a calcining kiln through a feeder to calcine, and adjusting the temperature of the calcining kiln to be more than 850 ℃;
s3: preserving heat, namely conveying the calcined active kaolin discharged from a discharge port of the calcining kiln to a heat preservation bin for heat preservation, after 5 hours of heat preservation, discharging, cooling and packaging;
s4: reacting, namely adding the activated kaolin prepared by the S3 into a polymerization reaction tank containing hydrochloric acid with the content of at least 30%, stirring by using a stirrer, arranging a coil pipe at the bottom of the polymerization reaction tank, introducing high-pressure air into the polymerization reaction tank through the coil pipe to enable the activated kaolin in the polymerization reaction tank to be suspended in the hydrochloric acid, heating the polymerization reaction tank to 95-100 ℃ by using a steam heater, and reacting for 5-8 hours;
s5: filtering, namely conveying the primary liquid after the reaction in the S4 to a plate-and-frame filter press through an acid-resistant conveying pump for solid-liquid separation, storing the filtered solution in a storage tank, washing the filtered filter cake with clear water, and temporarily storing the filter cake for screening;
s6: performing polymerization reaction, namely adding the solution filtered in the S5 into a polymerization reaction tank, adding water and calcium aluminate powder, and adjusting the pH value of the mixed solution to 3.5-3.8; the liquid after the polymerization reaction is filtered and pressed by a plate-and-frame filter press, the liquid after the filter pressing enters a liquid storage pool for storage, and the filter cake obtained after the filter pressing is washed by clear water and then temporarily stored for screening;
s7: and (3) drying, namely drying filter cakes obtained by filter pressing and filter pressing of the plate frames in S5 and S6 to obtain the required filter materials, then screening according to the diameter by using a screening machine, and packaging after screening.
Further, the activated kaolin in S1 is hard activated kaolin.
Further, in the step S1, a drum sieve with a diameter of 2 meters and a length of 5 meters is selected for sieving the granular materials.
Further, the temperature in the calcining kiln in the S2 is 880-900 ℃.
Further, the stirring speed of the stirrer in S4 is 45 revolutions per minute.
Further, in S7, the filter cake is dried by spray drying or roller drying.
Compared with the prior art, the invention has the following beneficial effects: the filter material prepared by the process is honeycomb-shaped, has a stable structure, and has a greatly improved effect compared with the existing quartz sand filter material found in practical use.
Detailed Description
The process for preparing the filter material by calcining the tailings of the production of the polyaluminium chloride by using the activated kaolin comprises the following steps:
s1: selecting and crushing materials, selecting active kaolin traditionally used for polyaluminium chloride production as a raw material, crushing the raw material by using a crusher, and screening out 5-8mm granules by using a drum screen for storage.
The active kaolin in the step is hard active kaolin which is traditionally used for producing raw materials of active kaolin for polyaluminium chloride, hard materials and soft materials are not separately calcined, tailings of the process are used for manufacturing filter materials, and the hard active kaolin is preferably used as a calcined raw material for improving the effect of the filter materials; and in the S1, a drum sieve with the diameter of 2 meters and the length of 5 meters is selected for sieving the granules, and the sieved granules with the particle size of 5-8mm meet the calcination standard of the process.
S2: and (3) calcining, namely conveying the qualified granular material screened out by the S1 to a calcining kiln through a feeder to calcine, and adjusting the temperature of the calcining kiln to be more than 850 ℃, wherein in the calcining process, the temperature in the calcining kiln is slightly higher than the calcining critical point temperature of the granular material, namely 850 ℃, and the temperature of the calcining kiln is preferably 880-900 ℃, so that the calcined active kaolin is harder and has higher density, and the acid dissolution rate of the calcined kaolin is optimal.
S3: preserving heat, namely conveying the calcined active kaolin discharged from a discharge port of the calcining kiln to a heat preservation bin for heat preservation, after 5 hours of heat preservation, discharging, cooling and packaging; the material discharged from the discharge port of the calcining kiln quickly enters a heat preservation bin for heat preservation, the calcined kaolin slowly permeates from the surface to the inside by utilizing the heat preservation time to reach the optimal aluminum content, and the calcined kaolin can be discharged from the heat preservation bin for cooling and packaging after heat preservation for 5 hours.
S4: reacting, namely adding the activated kaolin prepared by the S3 into a polymerization reaction tank containing hydrochloric acid with the content of at least 30%, stirring by using a stirrer, wherein the stirring speed of the stirrer is preferably 45 revolutions per minute, a coil pipe is arranged at the bottom of the polymerization reaction tank, introducing high-pressure air into the polymerization reaction tank through the coil pipe to enable the activated kaolin in the polymerization reaction tank to be suspended in the hydrochloric acid, and heating the polymerization reaction tank to 95-100 ℃ by using a steam heater for reacting for 5-8 hours;
s5: filtering, namely conveying the primary liquid after the reaction in the S4 to a plate-and-frame filter press through an acid-resistant conveying pump for solid-liquid separation, storing the filtered solution in a storage tank, washing the filtered filter cake with clear water, and temporarily storing the filter cake for screening;
s6: performing polymerization reaction, namely adding the solution filtered in the S5 into a polymerization reaction tank, adding water and calcium aluminate powder, and adjusting the pH value of the mixed solution to 3.5-3.8; the liquid after the polymerization reaction is filtered and pressed by a plate-and-frame filter press, the liquid after the filter pressing enters a liquid storage pool for storage, and the filter cake obtained after the filter pressing is washed by clear water and then temporarily stored for screening;
s7: and (3) drying, namely drying filter cakes obtained by filter pressing and filter pressing of the plate frames in S5 and S6 in a spray drying or roller drying mode, drying to obtain the filter material to be manufactured by the process, screening according to the diameter by using a screening machine, selecting the filter materials with different diameters, and packaging.
The process can also adjust the crushing effect of the material selecting and crushing section on the raw materials to produce granular materials with different diameters, so that filter materials with different diameters and specifications are produced, the filter materials produced by the process are watched under a magnifier, the filter materials are packaged in honeycomb mode, and the actual use analysis shows that the filter effect is 50 times stronger than that of a quartz sand filter material.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The process for preparing the filter material by calcining the tailings of the production of the polyaluminium chloride by using the activated kaolin is characterized by comprising the following steps of: the method comprises the following steps:
s1: selecting and crushing materials, namely selecting active kaolin traditionally used for polyaluminium chloride production as a raw material, crushing the raw material by using a crusher, and screening out 5-8mm granules by using a drum screen for storage;
s2: calcining, namely conveying the qualified granules screened out by the S1 to a calcining kiln through a feeder to calcine, and adjusting the temperature of the calcining kiln to be more than 850 ℃;
s3: preserving heat, namely conveying the calcined active kaolin discharged from a discharge port of the calcining kiln to a heat preservation bin for heat preservation, after 5 hours of heat preservation, discharging, cooling and packaging;
s4: reacting, namely adding the activated kaolin prepared by the S3 into a polymerization reaction tank containing hydrochloric acid with the content of at least 30%, stirring by using a stirrer, arranging a coil pipe at the bottom of the polymerization reaction tank, introducing high-pressure air into the polymerization reaction tank through the coil pipe to enable the activated kaolin in the polymerization reaction tank to be suspended in the hydrochloric acid, heating the polymerization reaction tank to 95-100 ℃ by using a steam heater, and reacting for 5-8 hours;
s5: filtering, namely conveying the primary liquid after the reaction in the S4 to a plate-and-frame filter press through an acid-resistant conveying pump for solid-liquid separation, storing the filtered solution in a storage tank, washing the filtered filter cake with clear water, and temporarily storing the filter cake for screening;
s6: performing polymerization reaction, namely adding the solution filtered in the S5 into a polymerization reaction tank, adding water and calcium aluminate powder, and adjusting the pH value of the mixed solution to 3.5-3.8; the liquid after the polymerization reaction is filtered and pressed by a plate-and-frame filter press, the liquid after the filter pressing enters a liquid storage pool for storage, and the filter cake obtained after the filter pressing is washed by clear water and then temporarily stored for screening;
s7: and (3) drying, namely drying filter cakes obtained by filter pressing and filter pressing of the plate frames in S5 and S6 to obtain the required filter materials, then screening according to the diameter by using a screening machine, and packaging after screening.
2. The process for preparing the filter material by using the tailings of the production of the polyaluminium chloride by calcining the activated kaolin as claimed in claim 1, wherein: the activated kaolin in the S1 is hard activated kaolin.
3. The process for preparing the filter material by using the tailings of the production of the polyaluminium chloride by calcining the activated kaolin as claimed in claim 1, wherein: and in the S1, a drum sieve with the diameter of 2 meters and the length of 5 meters is selected for sieving the granular materials.
4. The process for preparing the filter material by using the tailings of the production of the polyaluminium chloride by calcining the activated kaolin as claimed in claim 1, wherein: the temperature in the calcining kiln in the S2 is 880-900 ℃.
5. The process for preparing the filter material by using the tailings of the production of the polyaluminium chloride by calcining the activated kaolin as claimed in claim 1, wherein: the stirring speed of the stirrer in the S4 is 45 revolutions per minute.
6. The process for preparing the filter material by using the tailings of the production of the polyaluminium chloride by calcining the activated kaolin as claimed in claim 1, wherein: and in the step S7, drying the filter cake by spray drying or roller drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111138361.9A CN113786674A (en) | 2021-09-27 | 2021-09-27 | Process for preparing filter material from tailings of production of polyaluminium chloride by calcining activated kaolin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111138361.9A CN113786674A (en) | 2021-09-27 | 2021-09-27 | Process for preparing filter material from tailings of production of polyaluminium chloride by calcining activated kaolin |
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| Publication Number | Publication Date |
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| CN113786674A true CN113786674A (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111138361.9A Pending CN113786674A (en) | 2021-09-27 | 2021-09-27 | Process for preparing filter material from tailings of production of polyaluminium chloride by calcining activated kaolin |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069006A (en) * | 1991-07-30 | 1993-02-17 | 湖南永兴县化学钙塑厂 | A kind of method of producing polymerize aluminum chloride |
| EP0831960A1 (en) * | 1995-05-12 | 1998-04-01 | Interbrew Societe Anonyme | Filtration adjuvants, filtration supports, filtration process using them and process for regenerating said adjuvants |
| CN1334241A (en) * | 2000-07-14 | 2002-02-06 | 任忠胜 | Process for preparing polyaluminium chloride |
| CN101792165A (en) * | 2010-03-16 | 2010-08-04 | 贵州明威环保技术有限公司 | Method for producing polymeric aluminum chloride from kaolin |
| CN102134086A (en) * | 2010-01-25 | 2011-07-27 | 殷邗清 | Production method of polyaluminium chloride (PAC) |
| CN105776279A (en) * | 2014-12-24 | 2016-07-20 | 重庆蓝洁广顺净水材料有限公司 | Environmental-friendly clean production line for solid polyaluminium chloride |
| AU2020104225A4 (en) * | 2020-11-02 | 2021-03-11 | Jiangxi Academy Of Environmental Sciences | Kaolin-based water purifying material, preparation method and use thereof |
-
2021
- 2021-09-27 CN CN202111138361.9A patent/CN113786674A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069006A (en) * | 1991-07-30 | 1993-02-17 | 湖南永兴县化学钙塑厂 | A kind of method of producing polymerize aluminum chloride |
| EP0831960A1 (en) * | 1995-05-12 | 1998-04-01 | Interbrew Societe Anonyme | Filtration adjuvants, filtration supports, filtration process using them and process for regenerating said adjuvants |
| CN1334241A (en) * | 2000-07-14 | 2002-02-06 | 任忠胜 | Process for preparing polyaluminium chloride |
| CN102134086A (en) * | 2010-01-25 | 2011-07-27 | 殷邗清 | Production method of polyaluminium chloride (PAC) |
| CN101792165A (en) * | 2010-03-16 | 2010-08-04 | 贵州明威环保技术有限公司 | Method for producing polymeric aluminum chloride from kaolin |
| CN105776279A (en) * | 2014-12-24 | 2016-07-20 | 重庆蓝洁广顺净水材料有限公司 | Environmental-friendly clean production line for solid polyaluminium chloride |
| AU2020104225A4 (en) * | 2020-11-02 | 2021-03-11 | Jiangxi Academy Of Environmental Sciences | Kaolin-based water purifying material, preparation method and use thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李凯琦等: "《煤系高岭岩及深加工技术》", 31 July 2001, 中国建材工业出版社 * |
| 漆智鹏等: "高岭土一次酸浸制取聚合氯化铝工艺研究", 《中国造纸学报》 * |
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Application publication date: 20211214 |
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