CN106396222A - Recovery process for waste concentrated chromic acid - Google Patents
Recovery process for waste concentrated chromic acid Download PDFInfo
- Publication number
- CN106396222A CN106396222A CN201610418977.4A CN201610418977A CN106396222A CN 106396222 A CN106396222 A CN 106396222A CN 201610418977 A CN201610418977 A CN 201610418977A CN 106396222 A CN106396222 A CN 106396222A
- Authority
- CN
- China
- Prior art keywords
- waste water
- chromic acid
- recovery process
- section
- wastewater
- 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention specifically relates to a recovery process for waste concentrated chromic acid, belonging to the technical field of electroplating. The recovery process comprises the following steps: heating wastewater containing waste concentrated chromic acid to 60 to 70 DEG C so as to obtain first-section wastewater; then concentrating the first-section wastewater at a vacuum degree of -0.085 MPa so as to obtain second-section wastewater; adding sodium pyrosulfite and sodium hydroxide into the second-section wastewater successively so as to obtain third-section wastewater; adding starch into the third-section wastewater so as to obtain a solidified substance; and drying and packing the solidified substance. The recovery process provided by the invention has simple process flow and good practicality.
Description
Technical field
The present invention relates to electroplating technology field, the recovery process of specially a kind of dense chromic acid that gives up.
Background technology
The basic raw material of plating is exactly the heavy metals such as zinc, nickel, copper, chromium and gold, silver, is typical high energy consumption, high pollution
Industry.Due to electroplating principle, these metals are can not to become our required coating completely, wherein have considerable part will become
Pollutant is present in plating useless tank liquor and washings, also has partial gasification to become pernicious gas, forms the heavy metal to environment
Pollution., its plating average efficiency is less than 25% that is to say, that more than 75% 6 valency chromium or trivalent chromium run off in useless taking chromium as a example
In water and mud.
Process density wastewater containing chromium using traditional handicraft, in processing procedure, often consume the substantial amounts of energy；1. after treatment,
Frequently result in chromium residue；And arbitrarily abandon, it will lead to severe environmental pollution, and chromium ion loss is serious, be unfavorable for holding
Supervention exhibition；And outer process of entrusting will be a high spending.2. object will be solidified dry, packing, through detection, after drying
Solidification object contain substantial amounts of chromium hydroxide and starch, recoverable, reduce cost, beneficial to sustainable development.
Content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of big useless dense of the little, yield of power consumption
The recovery process of chromic acid.
For achieving the above object, the invention provides following technical scheme：A kind of give up dense chromic acid recovery process, including with
Lower step：
1) waste water of the dense chromic acid that gives up is heated to 60 DEG C -70 DEG C, obtains first paragraph waste water；
2) under the vacuum of -0.085MPa, by first paragraph Waste water concentrating, obtain second segment waste water；
3) add NaOH after first adding sodium pyrosulfite toward in second segment waste water, obtain the 3rd section of waste water；
4) add starch toward in the 3rd section of waste water, obtain solidifying object；
5) object will be solidified dry, packing.
Contrast the deficiencies in the prior art, the beneficial effect that the technical scheme that the present invention provides is brought：1. in -0.085MPa
Vacuum under, first paragraph Waste water concentrating obtains second segment waste water, under the vacuum of -0.085MPa, 60 DEG C -70 DEG C useless
Water just seethes with excitement, and then makes Waste water concentrating, so, is not having 100 DEG C（The boiling point of water）Just can evaporate the water, save energy
Source.
Specific embodiment
By specific embodiment, a kind of recovery process giving up dense chromic acid of the present invention will be described in detail below.
A kind of recovery process of the dense chromic acid that gives up, comprises the following steps：
1) waste water of the dense chromic acid that gives up is heated to 60 DEG C -70 DEG C, obtains first paragraph waste water；
2) under the vacuum of -0.085MPa, by first paragraph Waste water concentrating, second segment waste water, the vacuum of -0.085MPa are obtained
Under degree, 60 DEG C -70 DEG C of waste water just seethes with excitement, and then makes Waste water concentrating, so, is not having 100 DEG C（The boiling point of water）Just
Can evaporate the water, save the energy；
3) add NaOH after first adding sodium pyrosulfite toward in second segment waste water, obtain the 3rd section of waste water, contain in the 3rd waste liquid
There is precipitation；
4) add starch toward in the 3rd section of waste water, obtain solidifying object, by the addition of starch, first, accelerate the speed of solidification
Rate, improves operating efficiency, second, convenient solidification object is delivered in drying tunnel, reduce artificial, the 3rd, relatively direct to the
Three sections of waste water are dried, and have saved more energy；
5) object will be solidified dry, packing, through detection, the solidification object after drying contains substantial amounts of chromium hydroxide and starch,
Recoverable, reduces cost, beneficial to sustainable development.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, those skilled in the art exists
Carry out common variations and alternatives in the range of technical solution of the present invention all should comprise within the scope of the present invention.
Claims (1)
1. a kind of recovery process of the dense chromic acid that gives up is it is characterised in that comprise the following steps：
1) waste water of the dense chromic acid that gives up is heated to 60 DEG C -70 DEG C, obtains first paragraph waste water；
2) under the vacuum of -0.085MPa, by first paragraph Waste water concentrating, obtain second segment waste water；
3) add NaOH after first adding sodium pyrosulfite toward in second segment waste water, obtain the 3rd section of waste water；
4) add starch toward in the 3rd section of waste water, obtain solidifying object；
5) object will be solidified dry, packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610418977.4A CN106396222A (en) | 2016-06-13 | 2016-06-13 | Recovery process for waste concentrated chromic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610418977.4A CN106396222A (en) | 2016-06-13 | 2016-06-13 | Recovery process for waste concentrated chromic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106396222A true CN106396222A (en) | 2017-02-15 |
Family
ID=58006436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610418977.4A Pending CN106396222A (en) | 2016-06-13 | 2016-06-13 | Recovery process for waste concentrated chromic acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106396222A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070261A (en) * | 2009-11-24 | 2011-05-25 | 中国航空工业标准件制造有限责任公司 | Hexavalent chromium-containing waste water treatment method |
| CN105060599A (en) * | 2015-08-28 | 2015-11-18 | 中南大学 | Stainless steel pickling waste water resource recycling method |
-
2016
- 2016-06-13 CN CN201610418977.4A patent/CN106396222A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070261A (en) * | 2009-11-24 | 2011-05-25 | 中国航空工业标准件制造有限责任公司 | Hexavalent chromium-containing waste water treatment method |
| CN105060599A (en) * | 2015-08-28 | 2015-11-18 | 中南大学 | Stainless steel pickling waste water resource recycling method |
Non-Patent Citations (1)
| Title |
|---|
| 丁桓如，吴春华，龚云峰编著: "《工业用水处理工程》", 30 September 2014 * |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170215 |
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| RJ01 | Rejection of invention patent application after publication |