CN109336153A - The method for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid - Google Patents
The method for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid Download PDFInfo
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- CN109336153A CN109336153A CN201811599544.9A CN201811599544A CN109336153A CN 109336153 A CN109336153 A CN 109336153A CN 201811599544 A CN201811599544 A CN 201811599544A CN 109336153 A CN109336153 A CN 109336153A
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- polyaluminium chloride
- waste residue
- treatment agent
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- water
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/56—Chlorides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention provides a kind of method for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid, mainly includes carrying out washing process and alkali cleaning processing to water treatment agent polyaluminium chloride waste residue, obtains dechlorination treatment fluid and mixing mud；The dechlorination treatment fluid is placed in four body forced-circulation evaporation equipment of triple effect or carries out circulating and evaporating concentration in MVR forced-circulation evaporator, liquid polyaluminium chloride and condensed water is made.This method can recycle polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid, turn waste into wealth, and realize resource recycling, and the processing step is simple, is easy to industrialization promotion.
Description
Technical field
The present invention relates to water purification agent field, especially one kind to produce from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid poly-
The method of aluminium chloride.
Background technique
There are many method of production water treatment agent polyaluminium chloride (PAC) both at home and abroad, common method be bauxite or aluminium hydroxide,
Calcium aluminate powder acid-soluble one-step, i.e. bauxite or aluminium hydroxide and calcium aluminate powder are reacted with hydrochloric acid or mixed acid under certain condition
After obtain liquid PAC.Liquid PAC obtains solid product through roller drying or spray drying.China produces 6000kt liquid PAC per year,
Every liquid PAC of the production 1t containing 10% aluminium oxide will generate 150kg waste residue, will generate 900kt solid slag every year.It is such
Waste residue is in sticky shape, has faintly acid, contains the complicated ingredients such as aluminium, silicon, calcium, magnesium, iron, titanium.
Past water treatment agent polyaluminium chloride waste residue is arbitrarily toppled over mostly, is filled, and there are biggish environmental risks, simultaneously because
Also containing the water treatment agent polyaluminium chloride that can be recycled in water treatment agent polyaluminium chloride waste residue, arbitrarily topples over and cause largely
The wasting of resources.Therefore, many scholars are committed to being used for preparing other materials or recycle the water treatment agent polychlorostyrene in waste residue
Change aluminium, but would generally because eluate grade can not effectively control and caused by energy consumption it is surprising and occur because be concentrated by evaporation when
Conditional instability cause recycling water treatment agent polyaluminium chloride performance it is unstable the defects of, therefore, how recycling treatment polychlorostyrene
Change waste slag of aluminum, and the stable water treatment agent polyaluminium chloride of recyclability is current one from water treatment agent polyaluminium chloride waste residue
Problem.
In order to solve the above problems, people are seeking always a kind of ideal technical solution.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, take off to provide one kind from water treatment agent polyaluminium chloride waste residue
The method that chlorine treatment fluid produces polyaluminium chloride.
To achieve the goals above, the technical scheme adopted by the invention is that: it is a kind of from water treatment agent polyaluminium chloride waste residue
The method that dechlorination treatment fluid produces polyaluminium chloride, it the following steps are included:
De- Cl-Processing carries out washing process to water treatment agent polyaluminium chloride waste residue and carries out alkali cleaning processing using lye, obtains
To dechlorination treatment fluid and mixing mud, wherein controlling the lye mass percentage concentration is 8%~15%；
The dechlorination treatment fluid is placed in four body forced-circulation evaporation equipment of triple effect circulating and evaporating or MVR forced circulation is steamed
It sends out and carries out circulating and evaporating concentration in device, liquid polyaluminium chloride is made.Wherein, MVR forced-circulation evaporator is also referred to as machinery
Formula vapor recompression forced-circulation evaporator.
Based on above-mentioned, the de- Cl-Processing step specifically includes: carrying out first to the water treatment agent polyaluminium chloride waste residue
It is polychloride less than the water treatment agent of 15mm greater than the water treatment agent polyaluminium chloride waste residue of 15mm and partial size to obtain partial size for roughing processing
Waste slag of aluminum；Water treatment agent polyaluminium chloride waste residue using differential pulverizer by partial size greater than 15mm is ground into partial size less than 15mm's
Water treatment agent polyaluminium chloride waste residue, then using discongest device to after roughing and by smashed partial size less than 15mm
Water treatment agent polyaluminium chloride waste residue successively carries out first wash and takes off Cl-It handles and utilizes lye to carry out alkali cleaning and take off Cl-Processing, obtains
To the dechlorination treatment fluid and the mixing mud.
Based on above-mentioned, the de- Cl-Processing step specifically includes: carrying out first to the water treatment agent polyaluminium chloride waste residue
It is useless that roughing obtains the water treatment agent polyaluminium chloride of water treatment agent polyaluminium chloride waste residue of the partial size greater than 15mm and partial size less than 15mm
Slag；Water treatment agent polyaluminium chloride waste residue of the partial size greater than 15mm is ground at water of the partial size less than 15mm using differential pulverizer
Manage agent polyaluminium chloride waste residue, then using discongest device to after roughing with by smashed partial size less than 15mm water at
Reason agent polyaluminium chloride waste residue successively carries out first wash and takes off Cl-Processing, alkali cleaning take off Cl-Processing and second wash take off Cl-Place
Reason, obtains the dechlorination treatment fluid, the mixing mud and secondary water lotion.
Based on above-mentioned, the method for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid is also wrapped
It includes the recycling secondary water lotion and takes off Cl as first wash is carried out to the water treatment agent polyaluminium chloride waste residue-When processing
Water source.
Based on above-mentioned, the method for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid is also wrapped
The recycling condensed water is included, and is taken off using the condensed water as to water treatment agent polyaluminium chloride waste residue progress first wash
Cl-Water source when processing.
Based on above-mentioned, the lye is the mixing of one or both of sodium hydroxide solution, calcium hydroxide solution.
Compared with prior art, the present invention has substantive distinguishing features outstanding and significant progress, specifically, of the invention
The method that the slave water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid provided produces polyaluminium chloride, main includes first to water process
Agent polyaluminium chloride waste particle carries out washing process and alkali cleaning processing, obtains dechlorination treatment fluid and mixing mud；Then three are used
It imitates in four body forced-circulation evaporation equipment or MVR forced-circulation evaporator and the dechlorination treatment fluid is carried out at circulating and evaporating concentration
Liquid polyaluminium chloride, Al in the liquid polyaluminium chloride is made in reason2O3Content reaches 30% or more.This method forces four body of triple effect
Circulating and evaporating equipment or MVR forced-circulation evaporator are combined with the recycling of water treatment agent polyaluminium chloride waste residue, so that right
When water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid is evaporated concentration, the heat transfer evaporation of its forced circulation can be made, it is ensured that
The liquid polyaluminium chloride uniform component that recycles from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid is heated evenly, performance
Stablize, realizing turns waste into wealth and resource recycling, and the processing step is simple, is easy to industrialization promotion.
Further, this method further includes carrying out first with differential pulverizer to the water treatment agent polyaluminium chloride waste residue
It crushes, takes full advantage of the rotational speed difference in differential pulverizer between two breaker rolls, artificially enhance " sliding in shattering process
Poor phenomenon " extends contact, residence time that water treatment agent polyaluminium chloride waste residue is crushed between cog with breaker roll, overcomes at water
Slipping phenomenon when agent polyaluminium chloride waste residue crushes is managed, so that entire shattering process becomes more perfect, effective, so as to shorten
Grinding time and granule surface area is increased, water treatment agent polyaluminium chloride waste particle is come into full contact with water and lye,
Washing and alkaline cleaning procedure are accelerated, the de- Cl- processing time is shortened.
Further, this method is carrying out de- Cl to water treatment agent polyaluminium chloride waste residue-It is polychloride using liquid when processing
The aluminium property soluble easily in water with lye carries out de- Cl to it using water and lye-Processing, substantially simple physics take off Cl-Side
Method does not need consumption heat source and can also be molten by liquid polyaluminium chloride remaining in water treatment agent polyaluminium chloride waste residue to the full extent
Solution recycling.Meanwhile this method uses and discongests device to the water treatment agent polyaluminium chloride waste particle after crushing, screening process screening
It successively carries out first wash and takes off Cl-Processing, alkali cleaning take off Cl-Processing and second wash take off Cl-Processing, so that water treatment agent is poly-
Aluminium chloride waste particle can be thoroughly mixed with water and lye, accelerate washing and alkaline cleaning procedure, shorten de- Cl-When processing
Between.
Further, this method further includes recycling the secondary water lotion and as polychloride to the water treatment agent after screening
The step of water source when waste slag of aluminum particle is washed, water resource is saved, recycling for resource is realized.
Further, the concentration of the lye is too low will cause de- Cl-Insufficient, the excessive concentration of the lye then can
The subsequent recycling to polyaluminium chloride liquid is influenced, therefore, the lye that the present invention is 8%~15% using mass percentage concentration is to water
Inorganic agent polyaluminium chloride waste residue carries out alkali cleaning and takes off Cl-Processing is guaranteeing de- Cl-While effect, high-concentration alkali liquor is reduced to rear
The influence of continuous withdrawal liquid polyaluminium chloride.
Detailed description of the invention
Fig. 1 is that the slave water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid that the embodiment of the present invention 1 provides produces polyaluminium chloride
Method and process flow chart.
Fig. 2 is that the slave water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid that the embodiment of the present invention 2 provides produces polyaluminium chloride
Method and process flow chart.
Fig. 3 be the embodiment of the present invention 3 provide slave water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid in produce it is polychloride
The method and process flow chart of aluminium.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be described in further detail.
Following embodiment is process object with the existing water treatment agent polyaluminium chloride waste residue in Gongyi City.
To the existing water treatment agent polyaluminium chloride waste residue in Gongyi City carry out analysis of experiments, 8 samples of selection chemistry at
Point as shown in table 1, from table 1 it follows that Gongyi City it is existing water treatment agent polyaluminium chloride waste residue chemical component it is close, contain
Mass percent mean value is 22.05% moisture, 22.31% Al2O3, 38.9% SiO2, 1.97% TiO2, 0.39%
MgO, 3.04% CaO, 1.74% Fe2O3。
1 water treatment agent polyaluminium chloride waste residue chemical component table of table
| Sample number | Moisture % | Al2O3% | SiO2% | TiO2% | MgO% | CaO% | Fe2O3% |
| 1 | 33 | 15.61 | 37.12 | 1.82 | 0.15 | 1.88 | 1.21 |
| 2 | 31.62 | 17.92 | 29.17 | 2.59 | 0.63 | 3.46 | 2.5 |
| 3 | 26.8 | 24.4 | 40.92 | 1.5 | 0.4 | 3.78 | 1.5 |
| 4 | 8 | 25.6 | 41.7 | ||||
| 5 | 10 | 28.12 | 43.92 | ||||
| 6 | 15.56 | 26.01 | 39.72 | ||||
| 7 | 22.58 | 21.04 | 36.46 | ||||
| 8 | 28.86 | 19.76 | 42.15 | ||||
| Mean value | 22.05 | 22.31 | 38.90 | 1.97 | 0.39 | 1.74 |
Embodiment 1
The present embodiment provides a kind of methods for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid, such as
Shown in Fig. 1, it specifically includes the following steps:
De- Cl-Processing is carried out washing process to water treatment agent polyaluminium chloride waste residue and is handled using lye alkali cleaning, is taken off
Chlorine treatment fluid and mixing mud, wherein the mass percentage concentration for controlling the lye is 10%, and the lye is that sodium hydroxide is molten
Liquid；
Circulating and evaporating by the dechlorination treatment fluid be placed in four body forced-circulation evaporation equipment of triple effect carry out circulating and evaporating it is dense
Contracting processing, is made and contains 30%Al2O3Liquid polyaluminium chloride and condensed water.
Embodiment 2
The present embodiment provides a kind of methods for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid, such as
Shown in Fig. 2, step is roughly the same with the step in embodiment 1, the difference is that: method provided by the present embodiment is also wrapped
The recycling condensed water is included, and is taken off using the condensed water as to water treatment agent polyaluminium chloride waste residue progress first wash
Cl-Water source when processing；In addition, the mass percentage concentration of the lye is 8%.
Embodiment 3
The present embodiment provides a kind of methods for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid, such as
Shown in Fig. 3, it specifically includes the following steps:
Dechlorination ion processing carries out roughing to the water treatment agent polyaluminium chloride waste residue first and obtains partial size greater than 15mm's
Water treatment agent polyaluminium chloride waste residue and partial size are less than the water treatment agent polyaluminium chloride waste residue of 15mm；Then use differential pulverizer will
Water treatment agent polyaluminium chloride waste residue of the partial size greater than 15mm is ground into the water treatment agent polyaluminium chloride waste residue that partial size is less than 15mm, so
Afterwards using discongest device to after roughing and by smashed partial size less than 15mm water treatment agent polyaluminium chloride waste residue according to
Secondary progress first wash takes off Cl-Processing, alkali cleaning take off Cl-Processing and second wash take off Cl-Processing obtains dechlorination treatment fluid, mixes
Close mud and secondary water lotion, wherein controlling the lye mass percentage concentration is 13%, and the lye is that calcium hydroxide is molten
Liquid, the device of discongesting is hydrabrusher.
Circulating and evaporating carries out circulating and evaporating concentration, system to the dechlorination treatment fluid using MVR forced-circulation evaporator
29%Al must be contained2O3Liquid polyaluminium chloride and condensed water, recycle the condensed water be used as it is useless to the water treatment agent polyaluminium chloride
Water source when slag carries out first wash dechlorination ion processing is utilized.
Wherein, the present embodiment further includes recycling the secondary water lotion and as to the water treatment agent polyaluminium chloride waste residue
It carries out first wash and takes off Cl-The step of water source when processing is utilized.
Method provided by above-described embodiment by four body forced-circulation evaporation equipment of triple effect or MVR forced-circulation evaporator with
The recycling of water treatment agent polyaluminium chloride waste residue combines, so that carrying out to water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid
When evaporation and concentration, it can conduct heat and evaporate to its forced circulation, it is ensured that be returned from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid
Receive obtained polyaluminium chloride uniform component, be heated evenly, performance is stablized, realizing turns waste into wealth and resource recycling.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
Invention is explained in detail referring to preferred embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (6)
1. a kind of method for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid, which is characterized in that it is wrapped
Include following steps:
De- Cl-Processing carries out washing process to water treatment agent polyaluminium chloride waste residue and carries out alkali cleaning processing using lye, obtains dechlorination
Treatment fluid and mixing mud, wherein the mass percentage concentration for controlling the lye is 8%~15%；
The dechlorination treatment fluid is placed in four body forced-circulation evaporation equipment of triple effect or MVR forced-circulation evaporator by circulating and evaporating
Liquid polyaluminium chloride and condensed water is made in middle progress circulating and evaporating concentration.
2. the method according to claim 1 for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid,
It is characterized in that, the de- Cl-Processing step specifically includes:
Roughing processing is carried out to the water treatment agent polyaluminium chloride waste residue first, it is poly- to obtain water treatment agent of the partial size greater than 15 mm
The water treatment agent polyaluminium chloride waste residue of chlorination waste slag of aluminum and partial size less than 15 mm；Partial size is greater than by 15 mm using differential pulverizer
Water treatment agent polyaluminium chloride waste residue be ground into water treatment agent polyaluminium chloride waste residue of the partial size less than 15 mm, then using discongesting
Device successively carries out first to after roughing and by water treatment agent polyaluminium chloride waste residue of the smashed partial size less than 15 mm
Secondary water elution Cl-It handles and utilizes lye to carry out alkali cleaning and take off Cl-Processing, obtains the dechlorination treatment fluid and the mixing mud.
3. the method according to claim 1 for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid,
It is characterized in that, the de- Cl-Processing step specifically includes:
Roughing is carried out to the water treatment agent polyaluminium chloride waste residue first and obtains the water treatment agent polyaluminium chloride that partial size is greater than 15mm
Waste residue and partial size are less than the water treatment agent polyaluminium chloride waste residue of 15mm；Partial size is greater than to the water process of 15mm using differential pulverizer
Agent polyaluminium chloride waste residue is ground into the water treatment agent polyaluminium chloride waste residue that partial size is less than 15mm, then using discongesting device to process
Water treatment agent polyaluminium chloride waste residue after roughing and by smashed partial size less than 15mm successively carries out first wash and takes off Cl-
Processing, alkali cleaning take off Cl-Processing and second wash take off Cl-Processing, obtains the de- Cl-Treatment fluid, the mixing mud and secondary
Water lotion.
4. the method according to claim 3 for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid,
It is characterized in that, it further includes the recycling secondary water lotion and carries out first as to the water treatment agent polyaluminium chloride waste residue
Secondary water elution Cl-Water source when processing.
5. it is according to any one of claims 1 to 4 produced from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid it is polychloride
The method of aluminium, which is characterized in that it further includes recycling the condensed water, and gather using the condensed water as to the water treatment agent
Chlorination waste slag of aluminum carries out first wash and takes off Cl-Water source when processing.
6. the method according to claim 5 for producing polyaluminium chloride from water treatment agent polyaluminium chloride waste residue dechlorination treatment fluid,
It is characterized in that, the lye is the mixing of one or both of sodium hydroxide solution, calcium hydroxide solution.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112588799A (en) * | 2020-11-16 | 2021-04-02 | 浙江浙能技术研究院有限公司 | Method for dechlorinating dried ash |
| CN115180782A (en) * | 2022-02-22 | 2022-10-14 | 西安交通大学 | Method and system for dechlorinating chlor-alkali salt sludge waste residue |
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| CN115180782A (en) * | 2022-02-22 | 2022-10-14 | 西安交通大学 | Method and system for dechlorinating chlor-alkali salt sludge waste residue |
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