CN1040012A - The recovery method of the processing of vat powder waste liquid and S-WAT and sodium-chlor - Google Patents
The recovery method of the processing of vat powder waste liquid and S-WAT and sodium-chlor Download PDFInfo
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- CN1040012A CN1040012A CN 89102534 CN89102534A CN1040012A CN 1040012 A CN1040012 A CN 1040012A CN 89102534 CN89102534 CN 89102534 CN 89102534 A CN89102534 A CN 89102534A CN 1040012 A CN1040012 A CN 1040012A
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- waste liquid
- sodium
- chlor
- wat
- vat powder
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Abstract
The present invention relates to the method that a kind of zinc method is produced the processing of vat powder waste liquid and reclaim S-WAT and sodium-chlor from waste liquid.This method is direct logical sulfurous gas in waste liquid, controlled temperature 40-60 ℃, when waste liquor PH=5-6, return neutralization with former alkaline waste liquor, and make its pH=9-10.Then waste liquid is carried out single vaporization and get S-WAT, filtrate is carried out double evaporation-cooling and is got sodium-chlor, and the mother liquor after the filtration returns not sewage effluent of double evaporation-cooling, does not have secondary pollution.Gained sodium-chlor is used for salting-out procedures, does not influence the quality standard and the yield of vat powder.
Description
The present invention relates to the method that a kind of zinc method is produced the processing of vat powder (Sodium Hydrosulphite) waste liquid and reclaim S-WAT and sodium-chlor from waste liquid.
The process that the zinc method is produced vat powder is:
(1) the zinc powder slurry is reacted into low pressure zinc sulfite with sulfurous gas:
(2) neutralization and metathesis: use in the sodium hydroxide and low pressure zinc sulfite solution, low pressure zinc sulfite is transformed into Sodium Hydrosulphite simultaneously.
(3) saltout: the aqueous solution of vat powder is saltoutd with sodium-chlor and is got vat powder.
When producing vat powder with aforesaid method, 1 ton of vat powder of every production will produce 9m
3Waste liquid, wherein cold waste liquid 8m
3, thermal effluent 1m
3The composition of cold waste liquid and content are: NaCl20%, NaOH5%, Na
2S
2O
4(Sodium Hydrosulphite vat powder) 2%Na
2SO
32%, Na
2S0.5%, the composition of thermal effluent and content are: Na
2S
3-4%, other composition and cold waste liquid are basic identical.
The waste liquid that produces is because Na wherein
2S
2O
4In storage process, decompose institute extremely, so, NaOH in the waste liquid and Na
2S
2O
4Content obviously descends, and Na
2S content obviously raises.Can cause severe contamination to environment behind this discharging of waste liquid that contains alkali and a large amount of reducing substanceses, and useful matter is wherein utilized rationally and is wasted.
Present domestic producer's great majority with zinc method production vat powder are that waste liquid is directly emitted, minority producer is to reclaim NaCl behind the waste liquid direct evaporation to the treatment process of waste liquid, the mother liquor that is produced is a lower concentration NaOH solution, returns to be used in the production and the operation use.The shortcoming of this method is that waste liquid need leave standstill more than 24 hours before carrying out evaporation process, so that sedimentation microlite vat powder (Na wherein
2S
2O
4, 2H
2O), in the process of leaving standstill, have a certain amount of vat powder to decompose, and vat powder and sodium hydroxide complete reaction generate S-WAT and sodium sulphite in the high temperature evaporation process.(3Na
2S
2O
4+ NaOH → 5Na
2SO
3+ Na
2S+3H
2O) about 2% vat powder decomposes the NaOH that needs consumption about 2% fully in the waste liquid, thereby makes the content of NaOH in the mother liquor very low, makes again and contains a large amount of Na among the NaCl
2SO
3(Na in evaporative process
2SO
3Separate out prior to NaCl.) thisly contain a large amount of Na
2SO
3NaCl return use in the production and can make Na in the waste liquid
2SO
3Thereby the higher vat powder yield that makes of content is lower.Make Na in the waste liquid
2SO
3Content raise, this waste liquid is evaporated again reclaims NaCl, Na among the NaCl as a result
2SO
3Content can further raise, cause vicious cycle, and the rate of recovery of this method sodium-chlor and S-WAT is very low, the high deficiency in economic performance of cost.The NaCl of while waste liquid recovery for the third time is because Na wherein
2SO
3Content is too high, can not be used for vat powder production, thereby waste liquid have to discharge, and causes for the second time and pollutes.
The method that the present invention proposes can all be recycled the material in the waste liquid, does not discharge waste liquid, does not have secondary pollution, and the sodium-chlor Central Asia sodium sulphate content that is reclaimed is very low, can directly return in the salt operation and use, and does not influence the yield and the quality standard of vat powder.
According to the present invention waste liquid is directly fed SO
2, make the PH of waste liquid reach acid, preferably PH is 5-6, temperature preferably is controlled at 40-60 ℃ of NaOH and the SO in the waste liquid at 10-90 ℃
2Reaction all generates Na
2SO
3And NaHSO
3, also when the pH value of waste liquid reached neutral or acid, decomposition became Na to the vat powder in the waste liquid fully
2SO
3Na in the waste liquid
2S and SO
2Reaction generates Na
2SO
3, then,, make its PH to alkalescence with the alkaline waste liquor neutralization, preferably PH=9-10 makes NaHSO
3All will turn to Na
2SO
3
According to method of the present invention, only contain Na in the treated waste liquid
2SO
3With two kinds of salt of NaCl, utilize Na
2SO
3With the different solubilities of two kinds of salt of NaCl in water, carry out twice evaporation, Na
2SO
3At first separate out, filter Na
2SO
3Filtrate is carried out the evaporation second time again, obtains NaCl after the filtration, and mother liquor returns and carries out circulating and evaporating, thereby has removed sewage discharge, Na among the NaCl that obtains
2SO
3Content seldom, directly return quality and yield that salting-out procedures is used does not influence vat powder.Because Na in evaporative process
2SO
3Separate out prior to NaCl, thereby the Na among the NaCl
2SO
3Content can not increase, thereby has got rid of vicious cycle.
Main chemical reactions has:
Feeding SO
2Process in react and 1. and 2. carry out simultaneously, but under the excessive situation of SO promptly in acidic medium the reaction end of NaOH be Na
2SO
3With suitable NaHSO
3; Use in the excessive slightly alkaline waste liquor then and NaHSO
3, make it be converted into Na fully
2SO
3; 3. reaction is Na
2S
2O
4Decomposition reaction in neutrality or acidic solution, the Na of a molecule
2S
2O
4Decompose the SO that needs to consume a molecule
2, but produced the SO of 2 molecules after decomposing again
2, aggravate Na simultaneously
2S
2O
4Decomposition, the acid of solution improved rapidly, 4. reaction is the Na that self exists in the waste liquid
2S and Na
2S
2O
4Decompose the Na that produces
2S and excessive SO
2The Na that reaction is produced
2SO
3And H
2The reaction of S; 5. reaction is Na
2S
2O
4The decomposition reaction that the waste liquid shelf-time is long or temperature is too high (50 ℃) takes place in basic solution.
The present invention has following advantage and positively effect:
1. the main component in the waste liquid all is converted into S-WAT and sodium-chlor, has realized the living comprehensive utilization of producing the vat powder waste liquid of zinc method.
2. the present invention has realized the ideal process of waste liquid, and only product does not produce " three wastes ".
3, utilize method of the present invention, the sodium hydride that returns thing from waste liquid directly recycles in the retrieval system, can not influence the quality standard and the yield of vat powder, and the S-WAT that (seeing attached list 1) reclaims simultaneously reaches the raw product standard.
Annotate: the vat powder quality standard is 85.5%.
4, economic benefit and obvious social benefit, subordinate list 2 is for producing the economic benefit after 1 ton of vat powder institute removal waste fluid is handled with method of the present invention.
Be that one ton of vat powder of every production can reduce cost 804 yuan.
Technological process of the present invention as shown in the figure, description of drawings is as follows:
Neutralizer is waste liquid and SO
2Reaction gained solution.
Filtrate is single vaporization after-filtration gained solution.
Mother liquor is a double evaporation-cooling after-filtration gained solution.
Embodiment
1, the neutralization of waste liquid: get waste liquid 8.3m
3Put into 11m
3Reactor in stir and to feed SO down
2Hydrogen precursor reactant temperature is controlled at 40-60 ℃, normal pressure control reaction end P=5-6, and at this moment, the sodium hydroxide in the solution all reacts with sulfurous gas, and vat powder also decomposes fully, and 0.7-0.8m is used in sodium sulphite while and sulfurous gas reaction then
3Alkaline waste liquor neutralizes and regulates PH=9-10.Make the sodium pyrosulfate in the solution all be converted into S-WAT, because waste liquid itself is the saturated solution of sodium salt, so terminal point has a small amount of S-WAT to separate out.
2, single vaporization gets S-WAT, and the resulting solution that will neutralize carries out vacuum-evaporation, and temperature is controlled at 80-90 ℃, and the 35-45% that evaporated volume accounts for cumulative volume filters, and promptly is less than net weight 1.42T content and is 61.2% thick S-WAT.
3, double evaporation-cooling: the filtrate of evaporation is carried out the secondary vacuum evaporation for the first time, vaporization temperature is controlled at 80-90 ℃, filters, and gets the wet sodium-chlor (moisture 11%) of 1.72T and can directly return the independent or mixing of salting-out procedures, the content that uses S-WAT wherein is below 2%, and mother liquor returns double evaporation-cooling.
Claims (4)
1, a kind of method that reclaims sodium-chlor and S-WAT from zinc method production vat powder waste liquid is characterized in that the directly logical sulfurous gas of waste liquid; Control reaction temperature 40-60 ℃, when the PH=5-6 of waste liquid, transfer the waste liquid of PH=5-6 with alkaline waste liquor, make after its PH=9-10, handled waste liquid is carried out single vaporization get S-WAT, filter, filtrate is carried out double evaporation-cooling get sodium-chlor and mother liquor.
2,, it is characterized in that double evaporation-cooling filters the mother liquid obtained double evaporation-cooling that returns in back and uses according to the method for described recovery sodium-chlor of claim 1 and S-WAT.
3, according to the method for described recovery sodium-chlor of claim 1 and S-WAT, the salting-out procedures of its characterization when gained sodium-chlor behind double evaporation-cooling can directly return the production vat powder goes to use.
4,, it is characterized in that the volume of evaporation accounts for the 35-45% of cumulative volume when the S-WAT of evaporation recovery for the first time according to the method for described recovery sodium-chlor of claim 1 and S-WAT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102534 CN1014695B (en) | 1989-04-18 | 1989-04-18 | Process for producing safety powder by zinc method and method for recovering sodium sulfite and common salt from waste liguor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102534 CN1014695B (en) | 1989-04-18 | 1989-04-18 | Process for producing safety powder by zinc method and method for recovering sodium sulfite and common salt from waste liguor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1040012A true CN1040012A (en) | 1990-02-28 |
| CN1014695B CN1014695B (en) | 1991-11-13 |
Family
ID=4854773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102534 Expired CN1014695B (en) | 1989-04-18 | 1989-04-18 | Process for producing safety powder by zinc method and method for recovering sodium sulfite and common salt from waste liguor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1014695B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103694101A (en) * | 2013-11-07 | 2014-04-02 | 济南大学 | Comprehensive utilization method of sodium hydrosulfite waste residue |
| CN103755048A (en) * | 2013-12-30 | 2014-04-30 | 中盐安徽红四方股份有限公司 | New sodium hydrosulfite wastewater treatment method |
| CN103754896A (en) * | 2013-12-21 | 2014-04-30 | 中盐安徽红四方股份有限公司 | Method for extracting mirabilite from sodium hydrosulfite wastewater |
| CN105016312A (en) * | 2015-07-08 | 2015-11-04 | 湖南龙盛环保有限公司 | Recycling utilization method for sulfur-contained waste material in production of sodium hydrosulfite |
| CN105502769A (en) * | 2015-12-29 | 2016-04-20 | 河北诚信九天医药化工有限公司 | Method for recycling esterification acid wastewater produced in ethyl cyanoacetate production |
| CN110304639A (en) * | 2019-07-10 | 2019-10-08 | 连云港莱亚化学有限公司 | A kind of method of purification of ortho-sulfonic acid sodium benzaldehyde by-product salt |
-
1989
- 1989-04-18 CN CN 89102534 patent/CN1014695B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103694101A (en) * | 2013-11-07 | 2014-04-02 | 济南大学 | Comprehensive utilization method of sodium hydrosulfite waste residue |
| CN103694101B (en) * | 2013-11-07 | 2015-08-19 | 济南大学 | A kind of method of comprehensive utilization of sodium hydrosulfite waste residue |
| CN103754896A (en) * | 2013-12-21 | 2014-04-30 | 中盐安徽红四方股份有限公司 | Method for extracting mirabilite from sodium hydrosulfite wastewater |
| CN103754896B (en) * | 2013-12-21 | 2016-06-15 | 中盐安徽红四方股份有限公司 | A kind of method extracting Natrii Sulfas in sodium hydrosulfite wastewater |
| CN103755048A (en) * | 2013-12-30 | 2014-04-30 | 中盐安徽红四方股份有限公司 | New sodium hydrosulfite wastewater treatment method |
| CN105016312A (en) * | 2015-07-08 | 2015-11-04 | 湖南龙盛环保有限公司 | Recycling utilization method for sulfur-contained waste material in production of sodium hydrosulfite |
| CN105502769A (en) * | 2015-12-29 | 2016-04-20 | 河北诚信九天医药化工有限公司 | Method for recycling esterification acid wastewater produced in ethyl cyanoacetate production |
| CN105502769B (en) * | 2015-12-29 | 2018-05-08 | 河北诚信九天医药化工有限公司 | A kind of method of esterified acid waste water in recycling treatment cyan-acetic ester production |
| CN110304639A (en) * | 2019-07-10 | 2019-10-08 | 连云港莱亚化学有限公司 | A kind of method of purification of ortho-sulfonic acid sodium benzaldehyde by-product salt |
| CN110304639B (en) * | 2019-07-10 | 2022-04-08 | 浙江宏达化学制品有限公司 | Purification method of sodium o-sulfonate benzaldehyde byproduct salt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1014695B (en) | 1991-11-13 |
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