CN104478019A - Waste liquor alkali recycling method - Google Patents
Waste liquor alkali recycling method Download PDFInfo
- Publication number
- CN104478019A CN104478019A CN201410731873.XA CN201410731873A CN104478019A CN 104478019 A CN104478019 A CN 104478019A CN 201410731873 A CN201410731873 A CN 201410731873A CN 104478019 A CN104478019 A CN 104478019A
- Authority
- CN
- China
- Prior art keywords
- waste liquid
- alkali
- liquid alkali
- cycling
- reutilization
- 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
Links
Classifications
-
- 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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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a waste liquor alkali recycling method. The method comprises a step of adding quicklime to waste liquor alkali, so that chemical reactions are promoted as follows: CaO+H2O=Ca(OH)2, and Ca(OH)2+Na2CO3=CaCO3 (precipitate)+2NaOH; by virtue of the chemical reactions, the water content in the waste liquor alkali is reduced and pure alkali in the waste liquor alkali is converted into liquor alkali, and the liquor alkali is filtered, so that alkali liquid which is clear and can be recycled is obtained. By virtue of the method disclosed by the invention, the discharge of chemical waste is effectively reduced, environmental pollution is relieved and production cost is reduced.
Description
technical field]
The present invention relates to devil liquor recovery, particularly relate to a kind of method of waste liquid alkali cycling and reutilization.
background technology]
Aluminium bar is under the pressure of extrusion machine, and by metal die, thus form the aluminum products of different shape, after having extruded, leave aluminium block in mould, these aluminium blocks are tightly embedded in irony mould, cannot take out.In order to take out the aluminium block stayed in a mold, just need alkali lye to boil mould, allow liquid caustic soda (concentration about 20%) react with these aluminium blocks be embedded in mould, occur gap between aluminium block and mould, being embedded in aluminium block in irony mould can take out easily.
Alkali lye reacts below boiling the generation in mold process:
2NaOH+CO
2=Na
2CO
3+H
2O
2Al+NaOH+H
20=2NaAl0
2+H
2
In waste liquid alkali, main component is liquid caustic soda (NaOH), soda ash (NaCO
3), sodium metaaluminate (NaAl0
2) and water (H
2o), in waste liquid alkali, the concentration of liquid caustic soda (NaOH) is between 6-18%, soda ash (NaCO
3) about 10%, sodium metaaluminate (NaAl0
2) at about 2-3%.
The treatment process of tradition waste liquid alkali is directly discharged or carrys out neutralizing treatment with acid, and directly discharge pollutes the environment, and neutralizing treatment can strengthen production cost.
summary of the invention]
The technical problem to be solved in the present invention is to provide one can reduce the discharge of chemical industrial waste thing, is convenient to the method for waste liquid alkali cycling and reutilization.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of method of waste liquid alkali cycling and reutilization, adds unslaked lime in waste liquid alkali, makes it following chemical reaction occurs:
CaO+H
2O=Ca(OH)
2；
Ca (OH)
2+ Na
2cO3=Ca CO
3(precipitation)+2NaOH;
Reduced the content of water in waste liquid alkali by chemical reaction, soda ash in waste liquid alkali changed into liquid caustic soda, obtain after filtration clarifying, can the alkali lye of cycling and reutilization.
The method of above-described waste liquid alkali cycling and reutilization, waste liquid alkali comprises by weight percentage: NaOH 8-18%, NaCO
35-15%, NaAl0
22-6%.
The method of above-described waste liquid alkali cycling and reutilization, adds excessive unslaked lime in waste liquid alkali, and in the alkali lye of regeneration, contain weight percent concentration is the calcium hydroxide of 0.05-0.15%.
The method of waste liquid alkali cycling and reutilization of the present invention effectively can reduce the discharge of chemical industrial waste thing, reduces environmental pollution, and reduces productive expense.
embodiment]
In waste liquid alkali, in liquid caustic soda (NaOH), liquid caustic soda concentration is too low, reduces the impurity composition in waste liquid alkali, and increasing liquid caustic soda (NaOH) concentration is the key recycled solving waste liquid alkali.
Concrete treating processes is as follows: under normal temperature and pressure conditions, in waste liquid alkali, add excessive unslaked lime, and unslaked lime amount is according to the soda ash (NaCO in waste liquid alkali
3) content determines.Block unslaked lime can directly add in waste liquid alkali pond (tank).
After fully reacting, (lump lime disappears, and generates the calcium carbonate CaCO of white powder
3precipitation) generate turbid solution, in this time waste liquid alkali, essential substance is liquid caustic soda (NaOH), white lime (Ca (OH)
2), calcium carbonate (CaCO
3) and sodium metaaluminate (NaAl0
2), because of white lime (Ca (OH)
2) dissolved solution degree very low (under room temperature 20 degree, solubleness is 0.165g), at this moment again the waste liquid alkali after process is passed through the press filtration of plate pressure filter, by the calcium carbonate (CaCO in liquid caustic soda
3) and suspend white lime (Ca (OH)
2) separate liquid caustic soda (the wherein impure sodium metaaluminate (NaAl0 that can obtain clarifying
2) content at 2-3%, calcium hydroxide (Ca (OH)
2) about 0.1%) just can recirculation employ.
Unslaked lime is the cake mass of alkalescence, and namely the water of meeting in liquid caustic soda react, and generates Ca (OH) 2:
CaO+H
2O=Ca(OH)
2；
Ca (OH)
2+ Na
2cO3=Ca CO
3(precipitation)+2NaOH;
By reaction, reduce the content of water in waste liquid alkali, simultaneously by soda ash (NaCO in waste liquid alkali
3) change into liquid caustic soda (NaOH), add the concentration of liquid caustic soda (NaOH).At abundant rear the Filter Press of reaction, obtain clarification, can the alkali lye of cycling and reutilization.
(the liquid caustic soda (NaOH) 8%, soda ash (NaCO following to weight percent composition
3) 10%, sodium metaaluminate (NaAl0
2) 2-3%) waste liquid alkali is when processing, and (just processed 10% soda ash (NaCO in waste liquid alkali lye adding minimum unslaked lime (CaO)
3), do not remain Ca (OH)
2) in situation, after some row reaction treatment complete, the weight percent concentration of liquid caustic soda can reach about 16.5%, if add excessive unslaked lime (CaO), water in some waste liquid alkali of many consumption, the weight percent concentration of liquid caustic soda can reach 18-20%, can meet the needs of subsequent production completely, remaining Ca (OH) in liquid caustic soda
2(concentration 0.1%) also can react with the soda ash again produced (NaCO3) in subsequent production.
Another kind of impurity sodium metaaluminate (NaAl0 in waste liquid alkali
2) and Ca (OH)
2whether react, cannot determine due to limited conditions,
Ca (OH)
2+ 2NaAl0
2=Ca0.AL2O2 (precipitation)+2NaOH
But impurity sodium metaaluminate (NaAl02) relative concentration is lower, waste liquid alkali is recycled for 2-3 time and does not substantially have an impact.Sodium metaaluminate (NaAl0
2if) also react, waste liquid alkali just can restore substantially.
Claims (3)
1. a method for waste liquid alkali cycling and reutilization, is characterized in that, in waste liquid alkali, add unslaked lime, makes it following chemical reaction occurs:
CaO+H
2O=Ca(OH)
2；
Ca (OH)
2+ Na
2cO3=Ca CO
3(precipitation)+2NaOH;
Reduced the content of water in waste liquid alkali by chemical reaction, soda ash in waste liquid alkali changed into liquid caustic soda, obtain after filtration clarifying, can the alkali lye of cycling and reutilization.
2. the method for waste liquid alkali cycling and reutilization according to claim 1, it is characterized in that, waste liquid alkali comprises by weight percentage: NaOH 8-18%, NaCO
35-15%, NaAl0
22-6%.
3. the method for waste liquid alkali cycling and reutilization according to claim 1, is characterized in that, in waste liquid alkali, add excessive unslaked lime, and in the alkali lye of regeneration, contain weight percent concentration is the calcium hydroxide of 0.05-0.15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410731873.XA CN104478019A (en) | 2014-12-06 | 2014-12-06 | Waste liquor alkali recycling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410731873.XA CN104478019A (en) | 2014-12-06 | 2014-12-06 | Waste liquor alkali recycling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104478019A true CN104478019A (en) | 2015-04-01 |
Family
ID=52752663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410731873.XA Pending CN104478019A (en) | 2014-12-06 | 2014-12-06 | Waste liquor alkali recycling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104478019A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105585179A (en) * | 2016-03-08 | 2016-05-18 | 华南理工大学 | Recycling method for mold release waste liquor of aluminum profile factory |
| CN109322202A (en) * | 2018-09-30 | 2019-02-12 | 广西大学 | A kind of new low concentration black liquor alkali by virtue |
-
2014
- 2014-12-06 CN CN201410731873.XA patent/CN104478019A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105585179A (en) * | 2016-03-08 | 2016-05-18 | 华南理工大学 | Recycling method for mold release waste liquor of aluminum profile factory |
| CN105585179B (en) * | 2016-03-08 | 2018-07-10 | 华南理工大学 | A kind of aluminium section bar plant demoulding devil liquor recovery utilizes method |
| CN109322202A (en) * | 2018-09-30 | 2019-02-12 | 广西大学 | A kind of new low concentration black liquor alkali by virtue |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150401 |