CN1948156A - Method of producing aluminium polychloride using aluminium hydroxide mud - Google Patents
Method of producing aluminium polychloride using aluminium hydroxide mud Download PDFInfo
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- CN1948156A CN1948156A CN 200610097501 CN200610097501A CN1948156A CN 1948156 A CN1948156 A CN 1948156A CN 200610097501 CN200610097501 CN 200610097501 CN 200610097501 A CN200610097501 A CN 200610097501A CN 1948156 A CN1948156 A CN 1948156A
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Abstract
The present invention relates to a method for producing aluminium polychloride by utilizing aluminium hydroxide sludge. Said method includes the following steps: firstly, adding dilute hydrochloric acid or waste hydrochloric acid into reaction tank, then adding aluminium hydroxide sludge, stirring to make reaction and dissolvation, adding calcium aluminate powder and adding additive, make continuous reaction and dissolvation, heat-insulating, making natural precipitation to obtain supernatant fluid, said supernatant fluid is liquid aluminium polychloride; making the liquid aluminium polychloride be fed into a high-level tank and added into a pool under the drying drum, making the drying drum be contacted with said liquid aluminium polychloride, and making the liquid aluminium polychloride be adsorbed on the surface of said drum, utilizing scraper blade in the front of said drum to scrape off said absorbed liquid aluminium polychloride from the drum so as to obtain the solid aluminium polychloride.
Description
Technical Field
The invention relates to a method for producing polyaluminium chloride by using aluminium hydroxide sludge, which is particularly used for wastewater treatment to achieve the aim of comprehensively utilizing wastes and belongs to the technical field of sewage treatment.
Background
In the production process of aluminum materials, acid washing wastewater and alkali washing wastewater are generally generated, wherein the acid washing wastewater and the alkali washing wastewater are rich in free aluminum ions, and aluminum hydroxide sludge (hereinafter referred to as aluminum-containing sludge) is generated through sewage treatment.
In the prior art, the polyaluminium chloride is prepared by reacting dilute hydrochloric acid or waste hydrochloric acid with calcium aluminate, polymerizing, precipitating, separating, collecting supernatant, and oven drying. The polyaluminium chloride is used for wastewater treatment, thereby achieving the purpose of comprehensive utilization of waste.
Disclosure of Invention
The invention aims to overcome the defects, thereby providing a method for recycling the aluminum hydroxide sludge, taking waste as treasure, not easily causing secondary pollution and being beneficial to environmental sanitation; the cost can be reduced, production equipment is not required to be added, and the manufacturing process is simple; the polyaluminium chloride generated by the reaction can treat various waste water and reach the discharge standard.
The main solution of the invention is realized as follows:
the invention uses aluminum hydroxide sludge to produce polyaluminium chloride by the following steps:
1. adding 40-50 wt% of dilute hydrochloric acid or waste hydrochloric acid (with acid content of 20%) into a reaction tank, gradually adding 30-43 wt% of aluminum hydroxide sludge, stirring for reaction, completely reacting and dissolving the aluminum hydroxide sludge, and gradually generating liquid aluminum trichloride;
2. heating to a temperature of: 75-80 ℃; gradually adding 6-19 wt% of calcium aluminate powder, adding 1-1.5 wt% of an additive, continuing to react and dissolve, raising the temperature to 100-110 ℃, and keeping the pH value at 4-5;
3. carrying out heat preservation reaction for 2-3 hours, discharging, and naturally precipitating to obtain supernatant liquid, namely liquid polyaluminium chloride;
4. the liquid polyaluminium chloride is thrown into an elevated tank and added into a pool below a drying roller, the roller is contacted with the liquid polyaluminium chloride and then adsorbed on the surface of the roller, water is rapidly evaporated at the temperature of 150-200 ℃, a layer of dry polyaluminium chloride is formed on the surface of the roller, and the layer of dry polyaluminium chloride is shoveled down into solid polyaluminium chloride by a shovel plate in front of the roller.
The additive of the invention is a defoaming agent.
Compared with the prior art, the invention has the following advantages:
the invention generates the water purifying agent by the reaction of sulfuric acid or waste sulfuric acid, hydrochloric acid or waste hydrochloric acid and aluminum hydroxide sludge, is used for wastewater treatment, and achieves the aim of comprehensive utilization of wastes; the aluminum hydroxide sludge is recycled, the waste is used as a treasure, secondary pollution is not easy to form, environmental sanitation is facilitated, and land resources are not wasted; the cost can be reduced, production equipment is not required to be added, the manufacturing process is simple, and liquid polyaluminium chloride or solid polyaluminium chloride is used by a plurality of sewage treatment plants to completely meet the treatment requirement.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
the first embodiment is as follows:
the invention relates to a method for producing polyaluminium chloride by using aluminium hydroxide sludge generated in the production of aluminium material, which comprises the following steps:
adding 45 weight percent of dilute hydrochloric acid (with acid content of 20%) into a reaction tank, gradually adding 45 weight percent of aluminum hydroxide sludge, stirring for reaction, completely reacting and dissolving the aluminum hydroxide sludge to gradually generate liquid aluminum trichloride, and stopping heating when the heating temperature reaches 75 ℃; gradually adding 19 wt% of calcium aluminate powder, adding 1 wt% of defoaming agent, continuing to react and dissolve, and gradually increasing the temperature to 100 ℃ (boiling); after the calcium aluminate powder is added, detecting the pH value by using a 0-5 precise pH test paper, controlling the pH value to be 4.5, if the pH value is less than 4.5, continuously adding the calcium aluminate powder, and if the pH value is morethan 4.5, adding dilute hydrochloric acid. After the pH value is 4.5, the reaction is kept for 3 hours, and then the material is discharged. After natural precipitation, the supernatant is liquid polyaluminium chloride.
Monitoring the aluminum content (10%) of the liquid polyaluminum chloride, if the aluminum content is lower than the standard value, the acid content of the dilute hydrochloric acid should be increased, and if the aluminum content is higher than the standard value, a proper amount of water can be added or the acid content of the hydrochloric acid can be reduced.
Example two:
the invention relates to a method for producing polyaluminium chloride by using aluminium hydroxide sludge generated in the production of aluminium material, which comprises the following steps:
adding 50 wt% of waste hydrochloric acid (with acid content of 20%) into a reaction tank, gradually adding 39 wt% of aluminum hydroxide sludge, stirring for reaction, completely reacting and dissolving the aluminum hydroxide sludge, and gradually generating liquid aluminum trichloride; stopping heating when the heating temperature reaches 80 ℃; gradually adding 10 wt% of calcium aluminate powder, adding 1 wt% of defoaming agent, continuing to react and dissolve, and gradually increasing the temperature to 105 ℃ (boiling); after the calcium aluminate powder is added, detecting the pH value by using a 0-5 precise pH test paper, controlling the pH value to be 4, if the pH value is less than 4, continuously adding the calcium aluminate powder, and if the pH value is higher than 4, adding dilute hydrochloric acid. After the pH value is 4, the reaction is kept for 2.5 hours, and then the material is discharged. After natural precipitation, the supernatant is liquid polyaluminium chloride.
The liquid polyaluminium chloride is put into an elevated tank and added into a pool below a drying roller, the roasted roller is contacted with the liquid polyaluminium chloride and then adsorbed on the surface of the roller, the moisture is rapidly evaporated at the temperature of 150 ℃, a layer of dry polyaluminium chloride is formed on the surface of the roller, the layer of dry polyaluminium chloride is shoveled down by a shovel plate in front of the roller to form solid polyaluminium chloride, and the solid polyaluminium chloride is packaged and sold as a finished product.
Example three:
the invention relates to a method for producing polyaluminium chloride by using aluminium hydroxide sludge generated in the production of aluminium material, which comprises the following steps:
adding 42 wt% of dilute hydrochloric acid (with acid content of 20%) into a reaction tank, gradually adding 40 wt% of aluminum hydroxide sludge, stirring for reaction, completely reacting and dissolving the aluminum hydroxide sludge to gradually generate liquid aluminum trichloride, and stopping heating when the heating temperature reaches 80 ℃; gradually adding 17 wt% of calcium aluminate powder, adding 1 wt% of defoaming agent, continuing to react and dissolve, and gradually increasing the temperature to 110 ℃ (boiling); after the calcium aluminate powder is added, detecting the pH value by using a 0-5 precise pH test paper, and controlling the pH value to be 4.2; then the reaction is carried out for 2 hours under the condition of heat preservation, and then the material is discharged. After natural precipitation, the supernatant is liquid polyaluminium chloride. The liquid polyaluminium chloride is put into a head tank and added into a pool below a drying roller, the roasted roller is contacted with the liquid polyaluminium chloride and then adsorbed on the surface of the roller, the moisture is rapidly evaporated at the temperature of 180 ℃, a layer of dry polyaluminium chlorideis formed on the surface of the roller, the layer of dry polyaluminium chloride is shoveled down by a shovel plate in front of the roller to form solid polyaluminium chloride, and the solid polyaluminium chloride is packaged and sold as a finished product.
The reaction mechanism of the invention is as follows:
the formula of the hydrochloric acid and the aluminum-containing sludge to generate the aluminum trichloride:
the formula for the reaction of aluminum trichloride and calcium aluminate to produce polyaluminum chloride:
the three examples of the present invention employ conventional equipment, and the raw materials used are commercially available.
Claims (2)
1. A method for producing polyaluminium chloride by using aluminium hydroxide sludge is characterized by comprising the following process steps:
(1) adding 40-50 wt% of dilute hydrochloric acid or waste hydrochloric acid into a reaction tank, adding 30-43 wt% of aluminum hydroxide sludge, stirring for reaction, completely reacting and dissolving the aluminum hydroxide sludge, and gradually generating liquid aluminum trichloride;
(2) and heating to a temperature of: adding 6-19 wt% of calcium aluminate powder at 75-80 ℃, adding 1-1.5 wt% of additive, continuing to react and dissolve, raising the temperature to 100-110 ℃, and keeping the pH value at 4-5;
(3) carrying out heat preservation reaction for 2-3 hours, discharging, and naturally precipitating to obtain supernatant liquid, namely liquid polyaluminium chloride;
(4) and pumping the liquid polyaluminium chloride into an overhead tank, adding the liquid polyaluminium chloride into a pool below a drying roller, enabling the roller to be in contact with the liquid polyaluminium chloride and then adsorbed on the surface of the roller, forming dry polyaluminium chloride on the surface of the roller at the temperature of 150-200 ℃, and shoveling the dry polyaluminium chloride into solid polyaluminium chloride through a shoveling plate in front of the roller.
2. The method for producing polyaluminum chloride from aluminum hydroxide sludge according to claim 1, wherein the additive is antifoaming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610097501 CN1948156A (en) | 2006-10-31 | 2006-10-31 | Method of producing aluminium polychloride using aluminium hydroxide mud |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610097501 CN1948156A (en) | 2006-10-31 | 2006-10-31 | Method of producing aluminium polychloride using aluminium hydroxide mud |
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| CN1948156A true CN1948156A (en) | 2007-04-18 |
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| CN 200610097501 Pending CN1948156A (en) | 2006-10-31 | 2006-10-31 | Method of producing aluminium polychloride using aluminium hydroxide mud |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103833060A (en) * | 2014-03-24 | 2014-06-04 | 南通科纯化工有限公司 | Method for producing pure poly aluminum chloride |
| CN103833059A (en) * | 2014-03-03 | 2014-06-04 | 常州友邦净水材料有限公司 | Method for producing polyaluminum chloride without heating |
| CN104761030A (en) * | 2015-03-20 | 2015-07-08 | 杭州萧山三江净水剂有限公司 | Special efficient polyaluminum chloride for printing and dyeing wastewater, and preparation method thereof |
| TWI570067B (en) * | 2016-03-25 | 2017-02-11 | 力可達科技有限公司 | Method to manufacture recycled coagulant |
| CN106517265A (en) * | 2016-10-28 | 2017-03-22 | 东莞优胜环保科技有限公司 | Recycling utilization method of biochemical sludge |
| CN107434255A (en) * | 2016-10-31 | 2017-12-05 | 江苏德昶环保科技有限公司 | A kind of method for producing aluminium polychloride and gypsum series product using waste hydrochloric acid containing aluminium and aluminium-containing sludge |
| CN112499933A (en) * | 2020-11-19 | 2021-03-16 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing water purifying agent by utilizing red mud |
-
2006
- 2006-10-31 CN CN 200610097501 patent/CN1948156A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103833059A (en) * | 2014-03-03 | 2014-06-04 | 常州友邦净水材料有限公司 | Method for producing polyaluminum chloride without heating |
| CN103833060A (en) * | 2014-03-24 | 2014-06-04 | 南通科纯化工有限公司 | Method for producing pure poly aluminum chloride |
| CN104761030A (en) * | 2015-03-20 | 2015-07-08 | 杭州萧山三江净水剂有限公司 | Special efficient polyaluminum chloride for printing and dyeing wastewater, and preparation method thereof |
| TWI570067B (en) * | 2016-03-25 | 2017-02-11 | 力可達科技有限公司 | Method to manufacture recycled coagulant |
| CN106517265A (en) * | 2016-10-28 | 2017-03-22 | 东莞优胜环保科技有限公司 | Recycling utilization method of biochemical sludge |
| CN107434255A (en) * | 2016-10-31 | 2017-12-05 | 江苏德昶环保科技有限公司 | A kind of method for producing aluminium polychloride and gypsum series product using waste hydrochloric acid containing aluminium and aluminium-containing sludge |
| CN112499933A (en) * | 2020-11-19 | 2021-03-16 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing water purifying agent by utilizing red mud |
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