CN101575119B - Method for recovering chromic acid and water from chromeplating rinse water - Google Patents
Method for recovering chromic acid and water from chromeplating rinse water Download PDFInfo
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- CN101575119B CN101575119B CN2009100339185A CN200910033918A CN101575119B CN 101575119 B CN101575119 B CN 101575119B CN 2009100339185 A CN2009100339185 A CN 2009100339185A CN 200910033918 A CN200910033918 A CN 200910033918A CN 101575119 B CN101575119 B CN 101575119B
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Abstract
The invention relates to the technical field of chromate waste water treatment, and in particular discloses a method for reclaiming chromic acid and water from chromeplating rinse water. The method comprises the following steps: rinsing chromium-plated parts from a coating bath in a first-level washing reclaiming tank, a second-level washing reclaiming tank until the last-level washing reclaiming tank in turn; refluxing the rinse water in the last-level washing reclaiming tank to the previous level reclaiming tank in turn and finally to the first-level washing reclaiming tank; overflowing the chromium-containing rinse water in the first-level washing reclaiming tank to a circulating reclaiming tank, and heating the rinse water to a temperature of 50 DEG C by a heating device; pumping the rinse water into a vacuum evaporator by a circulating pump so that the water content is evaporated and chromic acid concentrated solution is left at the bottom of the evaporator; refluxing the chromic acid concentrated solution to the circulating recovery tank, and performing circulating evaporation in the vacuum evaporator again; and pumping finally concentrated chromic acid into a chrome-plating bath for reclaiming by a chromic acid reclaiming pump. The top of the vacuum evaporator is connected with a condensate water reclaiming tank through an ejector vacuum pump, and a cooling device in thecondensate water reclaiming tank condensates water vapor into liquid water which is overflowed to the last-level washing reclaiming tank from the condensate water reclaiming tank for recycling. The m ethod can recycle the chromic acid and the water in the chromeplating rinse water on line, save the significant cost required by a chemical method control, and reclaim resources.
Description
Technical field
The present invention relates to the chromate waste water processing technology field, particularly a kind of method that from chromium plating rinsing water, reclaims chromic acid and water resources.
Background technology
Plating is to utilize electrochemical method metal and nonmetallic surface to be decorated, protected and obtain a kind of technological process of some new capability.In the electroplating industry, plating commonly used has nickel plating, copper facing, chromium plating, zinc-plated etc.In electroplating process, in order to guarantee the quality of plated item, make metal plating have smooth slick good appearance and with the plating piece mortise, must before plating, thoroughly clean out the lip-deep dirt of plating piece (oil, rust, oxide skin etc.), and the liquid that adheres to the plating piece surface cleans up after plating.
According to investigations, China's electroplating device relevant with chromium at present has about 5000 covers, has produced a large amount of chromium plating wastewaters inevitably at electroplating process.And wherein chromium plating rinsing water is the main source of chromium plating wastewater, almost accounts for more than 80% of workshop chromate waste water total amount.In chrome-plated process, chromic trioxide only accounts for 15～25% as the coating deposition, and can run off in plating piece cleans up to 40～50% chromic trioxide, so contains a large amount of chromic acid in the chromium plating rinsing water, these rinse water will cause great pollution as the not treated environment that enters.
At present, the treatment process to chromium plating wastewater mainly concentrates on end treatment both at home and abroad, and the chromate waste water that has soon entered environment is handled, and makes its compliance with environmental protection requirements, and final discharging.These methods comprise: several different methods such as chemical reduction method, ion exchange method, electrolytic process, absorption method, membrane separation process and biological process.Wherein using maximum is chemical reduction method.Its ultimate principle is to add reductive agent under the acidic conditions of pH=2～4 in waste water, with Cr
6+Be reduced into Cr
3+, and then add people's lime or sodium hydroxide, make it o'clock generate chromium hydroxide precipitation, thereby remove chromium ion in pH=8～9; The throw out that forms dewaters and further handles.Chemical reduction method can be divided into ferrous sulfate one lime method, sulphite process, sulfurous gas method, ferrous salt method, sulfuration alkaline process etc. by the difference of reductive agent.Wherein, the sulphite process treatment capacity is big, and comprehensive utilization is convenient, and is most widely used at home and abroad.
Chemical reduction method is that the drawback of the method for other end treatments is, they all are based on pollutes the principle of administering again earlier, when processing waste water containing chrome, need add various chemical agents such as acid, alkali, reductive agent, so not only make the heavy cost pressure of enterprise's back, and owing to artificially added chemical ion, the effluent quality after can causing handling is poor, influences reuse, when handling composite waste, also cause secondary pollution easily.And end treatment is all handled chromium plating rinsing water as " refuse ", greatly wasted wherein a large amount of recycling chromic acid and water resources.
All the time, China all actively advocates the theory of cleaner production, opinion is polluted from source reduction, improve resource and rate of energy, reduce or avoid the generation of pollutent in the production process, recycle the resource that runs off in the production process as much as possible, therefore, each chromium plating enterprise urgently wishes and can develop the novel process novel method that a kind of chromium plating wastewater is handled from the angle of cleaner production, thereby both can solve the terminal cost waste problem of bringing of handling of chromium plating wastewater, can reclaim a large amount of chromic acid resource and water resourcess that run off in the chromium plating production again, make enterprise obtain practical economy return.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of chromic acid resource in the chromium plating rinsing water can being obtained to reclaim, get back to chrome-plating bath and utilize again, again can be with the clean method that from chromium plating rinsing water, reclaims chromic acid and water resources of handling the back recycle in rinse bath of chromium plating rinsing water.
According to technical scheme provided by the invention, the described method that reclaims chromic acid and water resources from chromium plating rinsing water comprises the steps:
Step 1, the plating piece of chrome-plating bath enters the washing accumulator tank that is positioned at chopped-off head, next stage washing accumulator tank successively, until the washing accumulator tank that is positioned at final stage, utilize pure water that same plating piece is carried out countercurrent rinsing step by step, the rinse water that are arranged in the washing accumulator tank of final stage are back to upper level washing accumulator tank, and reflux step by step, finally be back to the washing accumulator tank that is arranged in chopped-off head;
Step 2, the chromium plating rinsing water overflow of washing accumulator tank that is arranged in chopped-off head is established heating unit to the accumulator tank that circulates in the circulation accumulator tank, chromium plating rinsing water in the groove is heated;
Step 3 when chromium plating rinsing water is heated to 30～50 ℃ in the circulation accumulator tank, is sent into vacuum-evaporator by recycle pump, evaporates in vaporizer, and the realization chromic acid separates with water;
Adopt pipe connection to become closed cycle between the step 4, circulation accumulator tank and vacuum-evaporator, the chromic acid after concentrating is back to the circulation accumulator tank by the vacuum-evaporator bottom;
Step 5, the circulation accumulator tank is connected with chrome-plating bath, will concentrate chromic acid by chromic acid recovery pump and return chrome-plating bath;
Step 6, the vacuum-evaporator top is connected with the water of condensation accumulator tank by ejector vacuum pump, is provided with refrigerating unit in the water of condensation accumulator tank, and the water vapor condensation of being overflowed in the vaporizer top is a liquid water;
Step 7, the water of condensation accumulator tank is connected with the washing accumulator tank that is positioned at final stage, and the water of condensation automatic overflow in the water of condensation accumulator tank is to the washing accumulator tank that is positioned at final stage.
Being positioned on the washing accumulator tank of final stage and also being provided with the pure water supplementary device, is that treatment system is replenished pure water.
The invention has the advantages that:
1, method of the present invention is carried out online evaporation concentration to chromium plating rinsing waste water, makes moisture obtain evaporation, realizes concentrating of chromic acid, and reuse is extremely produced again, recycle after the vaporize water condensation, and the entire treatment process has realized closed cycle.
2, compare with at present most widely used chemical method end treatment, method of the present invention is set about from chromium plating production line source, carry out the online recovery of resource, not only having saved the required a large amount of medicament expenses of the terminal processing of chromate waste water uses, the chromic acid resource and the water resourcess of a large amount of losses during chromium plating is produced have also been reclaimed, significantly reduce the final quantity discharged of chromate waste water, also saved a lot of production costs when having reduced environmental pollution.
3, method of the present invention adopts vacuum low-pressure that chromium plating rinsing waste water is carried out evaporation concentration, not only can make vaporization temperature satisfy separating of chromic acid and water, and save the energy.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
The present invention reclaims chromic acid and water resources from chromium plating rinsing water method comprises the steps:
Step 1, the plating piece of chrome-plating bath enters the washing accumulator tank, the next stage that are positioned at chopped-off head successively and washes accumulator tank until the washing accumulator tank that is positioned at final stage, utilize pure water that same plating piece is carried out countercurrent rinsing step by step, the rinse water that are arranged in the washing accumulator tank of final stage are back to upper level washing accumulator tank, and reflux step by step, finally be back to the washing accumulator tank that is arranged in chopped-off head;
Step 2, the chromium plating rinsing water overflow of washing accumulator tank that is arranged in chopped-off head is established heating unit to the accumulator tank that circulates in the circulation accumulator tank, chromium plating rinsing water in the groove is heated;
Step 3 when chromium plating rinsing water is heated to 30～50 ℃ in the circulation accumulator tank, is sent into vacuum-evaporator by recycle pump, evaporates in vaporizer, and the realization chromic acid separates with water;
Step 4, adopting pipe connection between circulation accumulator tank and the vacuum-evaporator is closed cycle, the chromic acid after concentrating is back to the circulation accumulator tank by the vacuum-evaporator bottom;
Step 5, the circulation accumulator tank is connected with chrome-plating bath, will concentrate chromic acid by chromic acid recovery pump and return chrome-plating bath;
Step 6, the vacuum-evaporator top is connected with the water of condensation accumulator tank by ejector vacuum pump, is provided with refrigerating unit in the water of condensation accumulator tank, and the water vapor condensation of being overflowed in the vaporizer top is a liquid water;
Step 7, the water of condensation accumulator tank is connected with the washing accumulator tank that is positioned at final stage, and the water of condensation automatic overflow in the water of condensation accumulator tank is to the washing accumulator tank that is positioned at final stage.
Being positioned on the washing accumulator tank of final stage and also being provided with the pure water supplementary device, is that treatment system is replenished pure water.The temperature that contains the chromium poaching wastewater in the circulation accumulator tank is controlled to be 30～50 ℃, and absolute pressure is 7～13KPa in the vacuum-evaporator.
Concrete operations are as follows:
The same plating piece of chrome-plating bath enter successively the washing accumulator tank that is positioned at chopped-off head (the 1st grade), the 2nd grade of washing accumulator tank ..., n level washing accumulator tank, utilize pure water to carry out countercurrent rinsing step by step, the rinse water automatic overflow that is arranged in the washing accumulator tank of final stage (n level) is back to the washing accumulator tank of n-1 (upper level of n level), and reflux step by step, finally flow to the washing accumulator tank that is positioned at chopped-off head (the 1st grade).
When the chromium plating rinsing water liquid level that is arranged in the washing accumulator tank of chopped-off head (the 1st grade) reached overflow groove position, top, automatic overflow was to the accumulator tank that circulates.
Be provided with liquid level induction system and temperature sensing device in the circulation accumulator tank, when the water yield in the groove reached the work liquid level, heating-cooling device started automatically, made to reach working temperature, and then recycle pump starts automatically, and waste water in the circulation accumulator tank is squeezed into vacuum-evaporator.
Be vacuum state in the vacuum-evaporator under the vacuum pump effect, its absolute pressure is 7～9KPa.Chromium plating rinsing waste water carries out vacuum-evaporation in vaporizer, chromic acid is deposited in the vaporizer, and water is evaporated to water vapour, is overflowed by the vaporizer top.
Concentrate chromic acid in the vacuum-evaporator and be back to the circulation accumulator tank, and be recycled pump suction vaporizer and carry out circulating and evaporating and concentrate by base of evaporator.Chromic acid after concentrating in the circulation groove is after testing after the concentration, reclaims pump by chromic acid and squeezes into chrome-plating bath and carry out reuse.
Vacuum-evaporator upper water steam sprays into the water of condensation accumulator tank under the ejector vacuum pump effect, adopt the refrigerative pure water to absorb in groove, becomes liquid water.When the groove median water level reached overflow groove position, top, automatic overflow was to being positioned at final stage (n level) washing accumulator tank, once more as the plating piece rinse water.
Be positioned at final stage (n level) washing accumulator tank and be provided with the pure water auto-feeding device.When the water yield was lower than the work liquid level in the circulation accumulator tank, the pure water supplementary device moved automatically, total system is carried out the water yield replenish, and made system's energy continuous service.
Claims (1)
1. a method that reclaims chromic acid and water resources from chromium plating rinsing water is characterized in that this method comprises the steps:
Step 1, the plating piece of chrome-plating bath enters the washing accumulator tank, the next stage that are positioned at chopped-off head successively and washes accumulator tank until the washing accumulator tank that is positioned at final stage, utilize pure water that same plating piece is carried out countercurrent rinsing step by step, the rinse water that are arranged in the washing accumulator tank of final stage are back to upper level washing accumulator tank, and reflux step by step, finally be back to the washing accumulator tank that is arranged in chopped-off head;
Step 2, the chromium plating rinsing water overflow of washing accumulator tank that is arranged in chopped-off head is established heating unit to the accumulator tank that circulates in the circulation accumulator tank, chromium plating rinsing water in the groove is heated;
Step 3 when chromium plating rinsing water is heated to 30～50 ℃ in the circulation accumulator tank, is sent into vacuum-evaporator by recycle pump, evaporates in vaporizer, and the realization chromic acid separates with water;
Step 4, adopting pipe connection between circulation accumulator tank and the vacuum-evaporator is closed cycle, the chromic acid after concentrating is back to the circulation accumulator tank by the vacuum-evaporator bottom;
Step 5, the circulation accumulator tank is connected with chrome-plating bath, will concentrate chromic acid by chromic acid recovery pump and return chrome-plating bath;
Step 6, the vacuum-evaporator top is connected with the water of condensation accumulator tank by ejector vacuum pump, is provided with refrigerating unit in the water of condensation accumulator tank, and the water vapor condensation of being overflowed in the vaporizer top is a liquid water;
Step 7, the water of condensation accumulator tank is connected with the washing accumulator tank that is positioned at final stage, and the water of condensation automatic overflow in the water of condensation accumulator tank is to the washing accumulator tank that is positioned at final stage;
Being positioned on the washing accumulator tank of final stage and also being provided with the pure water supplementary device, is that treatment system is replenished pure water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100339185A CN101575119B (en) | 2009-05-27 | 2009-05-27 | Method for recovering chromic acid and water from chromeplating rinse water |
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| CN2009100339185A CN101575119B (en) | 2009-05-27 | 2009-05-27 | Method for recovering chromic acid and water from chromeplating rinse water |
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| CN101575119A CN101575119A (en) | 2009-11-11 |
| CN101575119B true CN101575119B (en) | 2011-05-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491568A (en) * | 2011-11-25 | 2012-06-13 | 北京大学 | Method for treating wastewater of electrolytic zinc rinsing technology |
| CN103060884B (en) * | 2013-01-14 | 2016-06-01 | 无锡市星亿涂装环保设备有限公司 | A kind of hard chrome plating production line chromic acid circulation and stress treatment system and technique |
| CN105645489A (en) * | 2015-12-30 | 2016-06-08 | 浙江重氏环境资源有限公司 | New process for recycling electroplating wastewater through carrying out evaporation concentration at reduced pressure |
| CN107119311A (en) * | 2017-06-29 | 2017-09-01 | 昆山福仕电子材料工业有限公司 | The quick clean online plating solution negative pressure evaporation reuse method of electronickelling production line and equipment |
| CN109306480A (en) * | 2018-11-12 | 2019-02-05 | 延康汽车零部件如皋有限公司 | A kind of processing method of waste electroplating liquor containing chromium |
| CN111455444A (en) * | 2020-03-24 | 2020-07-28 | 南京工业大学 | Treatment device and method for fully recycling electroplating rinse water |
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Denomination of invention: Method for recovering chromic acid and water from chromeplating rinse water Effective date of registration: 20131224 Granted publication date: 20110511 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi science and Technology Branch Pledgor: WUXI XINGYI PAINTING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co.,Ltd. Registration number: 2013990001018 |
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Date of cancellation: 20150115 Granted publication date: 20110511 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi science and Technology Branch Pledgor: WUXI XINGYI PAINTING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co.,Ltd. Registration number: 2013990001018 |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
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Address after: 214153 Jiangsu city of Wuxi province Huishan Qianqiao Outang Dongfeng Industrial Park Patentee after: WUXI XINGYI INTELLIGENT ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. Address before: 214153 Jiangsu city of Wuxi province Huishan Qianqiao Outang Dongfeng Industrial Park Patentee before: WUXI XINGYI INTELLIGENT ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. |
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| CP03 | Change of name, title or address |
Address after: 214153 Jiangsu city of Wuxi province Huishan Qianqiao Outang Dongfeng Industrial Park Patentee after: WUXI XINGYI INTELLIGENT ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. Address before: 214153 Jiangsu Province, Wuxi city Huishan District Outang Dongfeng Industrial Park Wuxi Xingyi coating environmental protection equipment Co. Patentee before: WUXI XINGYI PAINTING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co.,Ltd. |