CN1234370A - Method for recovering waste liquid of industrial mixed alkali - Google Patents
Method for recovering waste liquid of industrial mixed alkali Download PDFInfo
- Publication number
- CN1234370A CN1234370A CN 98108589 CN98108589A CN1234370A CN 1234370 A CN1234370 A CN 1234370A CN 98108589 CN98108589 CN 98108589 CN 98108589 A CN98108589 A CN 98108589A CN 1234370 A CN1234370 A CN 1234370A
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- CN
- China
- Prior art keywords
- alkali
- acid
- mixed alkali
- sylvite
- refining
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Abstract
The method for recovery and production of various mixed alkali waste liquor produced in production of chemical indigo dyes adopts the following steps: neutralization, coarse separation, concentration and crystallization, refining to reach to standard and cyclic use and treatment of residual liquor or adding adjuvants to convert its alkali one-by-one, and then making separation. It can completely solve the problem of environmental pollution resulted fromt he discharge of said waste liquor. Said invented method is applicable to general mixed alkali solution which contains more than two kinds of NaOH, Na2CO3, KOH and K2CO3 and possesses a certain concentration.
Description
The invention belongs to utilize and mix alkali (NaOH, Na
2CO
3, KOH, K
2CO
3) the recovery scope, the mixed alkali wasteliquid recoverying and utilizing method that mixed alkali is recycled and other industrial production forms that is specifically related to produce in the chemical industry indigo dye.Be applicable to that mixing alkali concn sets up, foreign matter content generally is lower than total alkali 20% scope.
The mixed alkali wasteliquid of the production of chemical industry indigo dye and other industry, discharge capacity is very big, and concentration is on the low side, is example with the indigo, produces the 1T indigo dye, will have 10T above 10% to mix the alkali wasteliquid discharging, and national industrial discharge mixes alkali wasteliquid, picks up ten thousand tons to count.Not only caused waste, and severe contamination environment.
The present invention is directed to above problem and propose the comprehensive production way that reclaims.
According to indigo dye production consumption calculations, this mixed alkali wasteliquid KOH and NaOH respectively account for 50%, through reclaim using, still have part to discharge, and its concentration is 10% not wait.(this mixed alkali is mainly made solvent and is used)
According to the formation of its mixed alkali wasteliquid adopt neutralization, slightly from, condensing crystal, refining wrapping process can accomplish that whole profits return processing.Mix alkali wasteliquid recovery 1T vitriolate of tartar calculating (sodium sulphate not very) according to every 6T10% and promptly produce the 1T indigo, other has 1.5T to go up the vitriolate of tartar generation, be worth 3000 yuan, (vitriolate of tartar 45%, 2000 yuan/T of valency calculates), 1 is produced per year 500T indigo factory (workshop) year recovery value is 1,500,000 yuan, and accomplishes and solved mixed alkali exhaust emission fully.(a little other material does not generally influence the use of this method in the mixed alkali).
Be specially:
The first step, neutralization: with sulfuric acid, (containing spent acid), hydrochloric acid (containing spent acid), nitric acid (containing spent acid), phosphoric acid (containing spent acid) or SO
2, CL
2, NO
2, P
2O
5(all containing waste gas) neutralization mixes alkali wasteliquid, when PH reaches neutrality, promptly forms various sylvite, inferior sylvite, burnt sylvite; Receive salt, Asia and receive salt, Jiao and receive salts solution; Or add auxiliary agent and change wherein alkali one by one.
Second step, utilize the different directly rough segmentations of proportion of its various different substancess, the material of the close proportion of difference was handled according to the 3rd step.
The 3rd step: according to the thermosol difference, be difference with the dissolubility difference, through concentrating the difference Crystallization Separation with each material.
As close solubleness material, one of them can be added auxiliary agent, form novel substance, warp concentrates Crystallization Separation respectively with the different of proportion solubleness to cause concentration.
The 4th step: refining up to standard, Recycling Mother Solution is used, and accomplishes recycling fully.
Embodiment:
(1) example: the first step: mix alkali lye (mix alkali lye and contain NAOH, KOH each half, concentration 10%) with sulfuric acid (or sulfur waste acid) neutralization, form vitriolate of tartar and sodium sulphate solution.
Second step:, adopt the difference of solubleness to concentrate meter temperature Crystallization Separation respectively because sodium sulphate is suitable with vitriolate of tartar concentration, proportion is approaching.(vitriolate of tartar is that 10-13 gram/100 gram water and sodium sulphate are at 25-40 ℃ of solubleness 25-32 gram/100 gram water 25-40 ℃ of solubleness)
The 3rd step: refining packing up to standard, Recycling Mother Solution is used.
(2) example: the first step: use SO
2(containing waste gas) neutralization mixes alkali (NAOH, KOH each half, concentration 10%) solution, forms sodium sulphite and pyrosulphite potassium solution.
Second step: because two kinds of material proportions differ bigger, (sodium sulphite is 1.54, and potassium pyrosulfite is 2.34) be two kinds of resultants of rough segmentation directly.
The 3rd step: the sylvite and the sodium salt solution of rough segmentation are concentrated, and crystallization forms two kinds of products.
The 4th step: refining (because of the product different methods can be different) up to standard, packing, Recycling Mother Solution is used.There is not discharge.
Example (three) the first step: neutralization
Contain K with the sulfuric acid neutralization
2CO
3With NA
2CO
3KOH (three kinds) respectively accounts for 1/3rd in addition, and concentration 10% is mixed alkali lye and formed vitriolate of tartar and sodium sulfate (having carbonic acid gas and water to generate in addition).
Second step: adopt vitriolate of tartar (or to add a little NH with the different concentrated Crystallization Separation respectively of sodium sulfate solubleness
3Generation potassium-ammonium sulfate formation concentration is different with proportion, the crystallization of rough segmentation reconcentration).
The 3rd step: refining up to standard, surplus Recycling Mother Solution is with accomplishing recycling fully.
Example (four): the first step, add auxiliary agent earlier and change a wherein alkali.
NAOH, KOH content each 50%, add an amount of sodium sulfate in the mixed alkali of concentration 10%, form mixing solutions.
In second step, heating concentrates, and reaction forms vitriolate of tartar and sodium hydroxide.
Vitriolate of tartar solubleness is little, Crystallization Separation.
The 3rd step, refining respectively up to standard, finished product packing.
More than four examples mix that a little other material does not generally influence present method in the alkali because of concentration is too low.
Claims (2)
- One, its feature of industrial mixed alkali recycling production way is divided into following several aspect:(1) utilizes the acid-base neutralisation principle, use sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid (each acid all contains spent acid) and SO 2, CO 2, NO 2, P 2O 5Gas (all containing waste gas) neutralization mixes alkali wasteliquid, forms various sylvite, inferior sylvite, burnt sylvite and receive salt, Asia to receive salt, Jiao and receive salt; Or add auxiliary agent and change a wherein alkali one by one.(2) proportion that utilize the to form above various materials directly rough segmentation in the aqueous solution that do not coexist.(3) utilize the different Crystallization Separation respectively that concentrate of the above various solubility of substances of formation.The back is refining up to standard, and Recycling Mother Solution is used.(4) utilize to form the difference of above each physical property, under proportion and solubleness all differed little situation, the interpolation auxiliary agent changed one of them material, form the new different specific weight or the material of solubleness, through concentrating Crystallization Separation respectively, the back is refining up to standard, and surplus Recycling Mother Solution is used.
- Two, present method is suitable for the waste liquid that mixes (comprising) alkali concn establishment solution substantially, NaOH, KOH, K 2CO 3, Na 2CO 3Mix the recovery of alkaline solution more than two kinds, the production way.This mixes, and a little other material impurities generally is lower than total alkalinity 20% in the alkali.Specific aim processing (as ways such as dischargings) again after treating repeatedly to use repeatedly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98108589 CN1234370A (en) | 1998-05-01 | 1998-05-01 | Method for recovering waste liquid of industrial mixed alkali |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98108589 CN1234370A (en) | 1998-05-01 | 1998-05-01 | Method for recovering waste liquid of industrial mixed alkali |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1234370A true CN1234370A (en) | 1999-11-10 |
Family
ID=5219682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98108589 Pending CN1234370A (en) | 1998-05-01 | 1998-05-01 | Method for recovering waste liquid of industrial mixed alkali |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1234370A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101323577B (en) * | 2007-06-14 | 2011-04-13 | 重庆达华砼外加剂科技发展有限公司 | Method for extracting aniline and sodium carbonate and potassium carbonate from mixed alkaline residue in bipseudoindoxyl production |
| CN102127307A (en) * | 2010-12-29 | 2011-07-20 | 梅剑平 | Recovered mixed alkali solution from production of indigo, and recovering method and use thereof |
| CN102350435A (en) * | 2011-09-09 | 2012-02-15 | 韩扶军 | Novel process for treating indigo alkaline residue |
| CN103554995A (en) * | 2013-10-30 | 2014-02-05 | 江苏泰丰化工有限公司 | Method for recycling mixed alkali liquor in indigo production |
| CN103556420A (en) * | 2013-10-30 | 2014-02-05 | 江苏泰丰化工有限公司 | Method for recycling mixed alkali liquor from after-treatment washing process of indigo |
| CN104016376A (en) * | 2014-06-25 | 2014-09-03 | 苏州晶瑞化学有限公司 | Continuous production method of high-purity potassium hydroxide water solution |
| CN104140114A (en) * | 2014-08-01 | 2014-11-12 | 张家港化工机械股份有限公司 | Method for recycling residual alkali liquor in caustic soda and caustic soda flake concentration device |
| CN104828843A (en) * | 2015-03-31 | 2015-08-12 | 合肥工业大学 | Method for extracting food grade potassium bicarbonate from alkaline wastewater system with low concentration of K<+> |
-
1998
- 1998-05-01 CN CN 98108589 patent/CN1234370A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101323577B (en) * | 2007-06-14 | 2011-04-13 | 重庆达华砼外加剂科技发展有限公司 | Method for extracting aniline and sodium carbonate and potassium carbonate from mixed alkaline residue in bipseudoindoxyl production |
| CN102127307A (en) * | 2010-12-29 | 2011-07-20 | 梅剑平 | Recovered mixed alkali solution from production of indigo, and recovering method and use thereof |
| CN102350435A (en) * | 2011-09-09 | 2012-02-15 | 韩扶军 | Novel process for treating indigo alkaline residue |
| CN103554995A (en) * | 2013-10-30 | 2014-02-05 | 江苏泰丰化工有限公司 | Method for recycling mixed alkali liquor in indigo production |
| CN103556420A (en) * | 2013-10-30 | 2014-02-05 | 江苏泰丰化工有限公司 | Method for recycling mixed alkali liquor from after-treatment washing process of indigo |
| CN103556420B (en) * | 2013-10-30 | 2015-11-18 | 江苏泰丰化工有限公司 | A kind of method reclaiming mixed alkali liquor from indigo aftertreatment washing process |
| CN104016376A (en) * | 2014-06-25 | 2014-09-03 | 苏州晶瑞化学有限公司 | Continuous production method of high-purity potassium hydroxide water solution |
| CN104140114A (en) * | 2014-08-01 | 2014-11-12 | 张家港化工机械股份有限公司 | Method for recycling residual alkali liquor in caustic soda and caustic soda flake concentration device |
| CN104140114B (en) * | 2014-08-01 | 2016-01-13 | 苏州天沃科技股份有限公司 | The recovery method of residual alkali lye in caustic soda, sheet alkali concentrate apparatus |
| CN104828843A (en) * | 2015-03-31 | 2015-08-12 | 合肥工业大学 | Method for extracting food grade potassium bicarbonate from alkaline wastewater system with low concentration of K<+> |
| CN104828843B (en) * | 2015-03-31 | 2016-07-06 | 合肥工业大学 | A kind of method extracting food grade potassium bicarbonate from low concentration K+ alkali liquor waste water system |
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