CN101913629A - Method for recovering sodium nitrate from silver waste water - Google Patents
Method for recovering sodium nitrate from silver waste water Download PDFInfo
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- CN101913629A CN101913629A CN 201010249286 CN201010249286A CN101913629A CN 101913629 A CN101913629 A CN 101913629A CN 201010249286 CN201010249286 CN 201010249286 CN 201010249286 A CN201010249286 A CN 201010249286A CN 101913629 A CN101913629 A CN 101913629A
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- waste water
- sodiumnitrate
- value
- silver waste
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Abstract
The invention relates to a method for recovering sodium nitrate from silver waste water, belonging to the technical field of environmental protection. The method for recovering the sodium nitrate from the silver waste water is characterized by comprising the following steps of: carrying out alkaline oxidation cyanide breaking on the silver waste water; adding acids for neutralization, and then filtering a solution for evaporation and concentration; and cooling and crystallizing to obtain the sodium nitrate. The method for recovering the sodium nitrate from the silver waste water has the advantages of simple operation method, economy and environmental protection and can sufficiently utilize the resources, thereby enhancing the economic benefits to a certain degree.
Description
Technical field
The present invention relates to a kind of method that from silver waste water, reclaims SODIUMNITRATE, belong to environmental technology field.
Background technology
Silver Nitrate and sodium cyanide reaction can be prepared silver cyanide, produce a large amount of waste water in the production process, mainly contain prussiate and small amount of silver, also contain a large amount of SODIUMNITRATE.At present, the method that domestic and international Processing Ag waste water generally adopts is alkaline oxygenated broken cyanide, and its main chemical reactions formula is:
CN
-+HClO→CNCl+OH
-
CNCl+2OH
-→CNO
-+Cl
-+H
2O
2CNO
-+4OH
-+3Cl
2→2CO
2+N
2+6Cl
-+2H
2O
Add the acid neutralization then, be neutral discharging after prussiate is qualified, caused the loss of a large amount of SODIUMNITRATE.SODIUMNITRATE if can be reclaimed, not only obtain the byproduct SODIUMNITRATE but also can increase water quality, the treatment process of a kind of economic environmental protection of can yet be regarded as.
The SODIUMNITRATE physico-chemical property: chemical formula is NaNO
3, be water white transparency or the yellow rhomboidan of white little band.Its bitter is salty, and soluble in water and liquefied ammonia is slightly soluble in glycerine and the ethanol, easy deliquescence, and when containing the minute quantity sodium chloride as impurity, the SODIUMNITRATE deliquescence just greatly increases especially.When heating, SODIUMNITRATE easily becomes to resolve into Sodium Nitrite and oxygen.SODIUMNITRATE can be combustion-supporting, must be stored in the place of shady and cool ventilation.
SODIUMNITRATE has purposes widely.It is a raw material of making saltpetre, mining explosive, picric acid, dyestuff etc.; Make the nitrating agent of dyestuff intermediate; Glass industry is as defoamer, discoloring agent, finings and Aid for Oxidation flux.
Summary of the invention
The objective of the invention is to solve the weak point that above-mentioned prior art exists, a kind of economic environmental protection is provided, fully economizes on resources, can fully reclaims the method that from silver waste water, reclaims SODIUMNITRATE that SODIUMNITRATE can be increased water quality again that obtains.
The present invention is achieved by the following technical solutions:
A kind of method that reclaims SODIUMNITRATE from silver waste water, its special character is
Silver waste water basic oxide broken cyanide, add acid neutralization after, solution filtered carries out evaporation concentration, promptly get SODIUMNITRATE behind the crystallisation by cooling.
The concrete operations step of above-mentioned reaction is as follows:
1, the alkaline oxygenated broken cyanide of silver waste water: when each broken cyanide is handled operation, at first the pipe valve in broken cyanide pond is opened, the ON cycle pump makes this pond be in recurrent state; Survey PII value 2-4 after circulation 20-50 minute, add liquid caustic soda 100-200L and continue circulation and stir, adding clorox (11% available chlorine) circulation 3-6 is individual hour when treating liquid pH value average out to 10-12 in the pond in.
2, add hydrochloric acid and adjust pH value: after the prediction prussiate is qualified, adds appropriate hydrochloric acid and adjust pH value, it is 7 that circulation is stirred to pH value, as the defective continuation that predicts the outcome repeats said procedure and can carry out the recovery of SODIUMNITRATE to prussiate after qualified.
3, with solution elimination impurity, under 130 ℃-140 ℃, carry out evaporation concentration, then at 50 ℃ of-70 ℃ of following crystallisation by cooling, separate, be drying to obtain the SODIUMNITRATE finished product.
Reclaim the method for SODIUMNITRATE in a kind of silver waste water of the present invention, working method is simple, and economic environmental protection can make full use of resource, has increased economic benefit to a certain extent.
Embodiment
Below provide the specific embodiment of the present invention, be used for formation of the present invention is further described.
Embodiment 1:
A kind of method that from silver waste water, reclaims SODIUMNITRATE, the concrete operations step is as follows:
1, the alkaline oxygenated broken cyanide of silver waste water: when each broken cyanide is handled operation, at first the pipe valve in broken cyanide pond is opened, the ON cycle pump makes this pond be in recurrent state; Circulate after 20 minutes and to survey pH value 2, add liquid caustic soda 100L and continue circulation and stir, add clorox (11% available chlorine) when treating liquid pH value average out to 10 in the pond in and circulated 3 hours.
2, add hydrochloric acid and adjust pH value: after the prediction prussiate is qualified, adds appropriate hydrochloric acid and adjust pH value, it is 7 that circulation is stirred to pH value, as the defective continuation that predicts the outcome repeats said procedure and can carry out the recovery of SODIUMNITRATE to prussiate after qualified.
3, with solution elimination impurity, under 130 ℃, carry out evaporation concentration, then at 50 ℃ of following crystallisation by cooling, separate, be drying to obtain the SODIUMNITRATE finished product.
Embodiment 2:
A kind of method that from silver waste water, reclaims SODIUMNITRATE, the concrete operations step is as follows:
1, the alkaline oxygenated broken cyanide of silver waste water: when each broken cyanide is handled operation, at first the pipe valve in broken cyanide pond is opened, the ON cycle pump makes this pond be in recurrent state; Circulate after 50 minutes and to survey PII value 4, add liquid caustic soda 200L and continue circulation and stir, adding clorox (11% available chlorine) circulated 6 hours when treating liquid pH value average out to 12 in the pond in.
2, add hydrochloric acid and adjust pH value: after the prediction prussiate is qualified, adds appropriate hydrochloric acid and adjust pH value, it is 7 that circulation is stirred to pH value, as the defective continuation that predicts the outcome repeats said procedure and can carry out the recovery of SODIUMNITRATE to prussiate after qualified.
3, with solution elimination impurity, under 140 ℃, carry out evaporation concentration, then at 70 ℃ of following crystallisation by cooling, separate, be drying to obtain the SODIUMNITRATE finished product.
Embodiment 3:
A kind of method that from silver waste water, reclaims SODIUMNITRATE, the concrete operations step is as follows:
1, the alkaline oxygenated broken cyanide of silver waste water: when each broken cyanide is handled operation, at first the pipe valve in broken cyanide pond is opened, the ON cycle pump makes this pond be in recurrent state; Circulate after 30 minutes and to survey pH value 3, add liquid caustic soda 150L and continue circulation and stir, add clorox (11% available chlorine) when treating liquid pH value average out to 11 in the pond in and circulated 4 hours.
2, add hydrochloric acid and adjust pH value: after the prediction prussiate is qualified, adds appropriate hydrochloric acid and adjust pH value, it is 7 that circulation is stirred to pH value, as the defective continuation that predicts the outcome repeats said procedure and can carry out the recovery of SODIUMNITRATE to prussiate after qualified.
3, with solution elimination impurity, under 135 ℃, carry out evaporation concentration, then at 60 ℃ of following crystallisation by cooling, separate, be drying to obtain the SODIUMNITRATE finished product.
Reclaim the method for SODIUMNITRATE in a kind of silver waste water of above embodiment, working method is simple, and economic environmental protection can make full use of resource, has increased economic benefit to a certain extent.
Claims (2)
1. a method that reclaims SODIUMNITRATE from silver waste water is characterized in that
Silver waste water alkali spare oxide compound broken cyanide, add acid neutralization after, solution filtered carries out evaporation concentration, promptly get SODIUMNITRATE behind the crystallisation by cooling.
2. according to the described a kind of method that from silver waste water, reclaims SODIUMNITRATE of claim 1, it is characterized in that the concrete operations step is as follows:
1), the alkaline oxygenated broken cyanide of silver waste water: when each broken cyanide is handled operation, at first the pipe valve in broken cyanide pond is opened, the ON cycle pump makes this pond be in recurrent state; Survey pH value 2-4 after circulation 20-50 minute, add liquid caustic soda 100-200L and continue circulation and stir, added available chlorine when treating the liquid pH value average out to 10-12 pond in and be 11% clorox circulation 3-6 individual hour;
2), add hydrochloric acid and adjust pH value: after the prediction prussiate is qualified, adds appropriate hydrochloric acid and adjust pH value, it is 7 that circulation is stirred to pH value, as the defective continuation that predicts the outcome repeats said procedure and can carry out the recovery of SODIUMNITRATE to prussiate after qualified;
3), with solution elimination impurity, under 130 ℃-140 ℃, carry out evaporation concentration, then at 50 ℃ of-70 ℃ of following crystallisation by cooling, separate, be drying to obtain the SODIUMNITRATE finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102492869A CN101913629B (en) | 2010-08-05 | 2010-08-05 | Method for recovering sodium nitrate from silver waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102492869A CN101913629B (en) | 2010-08-05 | 2010-08-05 | Method for recovering sodium nitrate from silver waste water |
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|---|---|
| CN101913629A true CN101913629A (en) | 2010-12-15 |
| CN101913629B CN101913629B (en) | 2012-05-23 |
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|---|---|---|---|
| CN2010102492869A Active CN101913629B (en) | 2010-08-05 | 2010-08-05 | Method for recovering sodium nitrate from silver waste water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351220A (en) * | 2011-07-08 | 2012-02-15 | 无锡市霄鹰环境科技有限公司 | System and technology for recovering sodium nitrate from tin-containing waste liquid treatment tail water |
| CN106830016A (en) * | 2016-12-30 | 2017-06-13 | 浙江大洋生物科技集团股份有限公司 | The waste liquid containing potassium produced using synthesizing fungicide Difenoconazole produces high pure nitric acid potassium method |
| CN107010771A (en) * | 2017-04-10 | 2017-08-04 | 湖北振华化学股份有限公司 | Medium chrome yellow production technology Sewage treatment Application way |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195595A (en) * | 2007-12-12 | 2008-06-11 | 湖北兴发化工集团股份有限公司 | Method for recycling dimethyl sulfone and sodium nitrate from dimethyl sulfoxide waste slag |
-
2010
- 2010-08-05 CN CN2010102492869A patent/CN101913629B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195595A (en) * | 2007-12-12 | 2008-06-11 | 湖北兴发化工集团股份有限公司 | Method for recycling dimethyl sulfone and sodium nitrate from dimethyl sulfoxide waste slag |
Non-Patent Citations (1)
| Title |
|---|
| 《高师理科学刊》 20061130 张云等 含氰电镀废水处理 51-53,94 1-2 第26卷, 第4期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351220A (en) * | 2011-07-08 | 2012-02-15 | 无锡市霄鹰环境科技有限公司 | System and technology for recovering sodium nitrate from tin-containing waste liquid treatment tail water |
| CN102351220B (en) * | 2011-07-08 | 2013-07-17 | 无锡市霄鹰环境科技有限公司 | System and technology for recovering sodium nitrate from tin-containing waste liquid treatment tail water |
| CN106830016A (en) * | 2016-12-30 | 2017-06-13 | 浙江大洋生物科技集团股份有限公司 | The waste liquid containing potassium produced using synthesizing fungicide Difenoconazole produces high pure nitric acid potassium method |
| CN107010771A (en) * | 2017-04-10 | 2017-08-04 | 湖北振华化学股份有限公司 | Medium chrome yellow production technology Sewage treatment Application way |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101913629B (en) | 2012-05-23 |
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Denomination of invention: A method of recovering sodium nitrate from silver waste water Effective date of registration: 20200914 Granted publication date: 20120523 Pledgee: Yantai Branch of China Merchants Bank Co., Ltd Pledgor: Yantai Zhaojin Kanfort Precious Metals Incorporated Co. Registration number: Y2020980006033 |
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Date of cancellation: 20211018 Granted publication date: 20120523 Pledgee: Yantai Branch of China Merchants Bank Co., Ltd Pledgor: Yantai Zhaojin Kanfort Precious Metals Incorporated Co. Registration number: Y2020980006033 |
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Denomination of invention: Method for recovering sodium nitrate from silver waste water Effective date of registration: 20220421 Granted publication date: 20120523 Pledgee: Yantai Branch of China Merchants Bank Co.,Ltd. Pledgor: Yantai Zhaojin Kanfort Precious Metals Incorporated Co. Registration number: Y2022980004544 |
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