CN87102036A - Treatment for rinsig waste water from low chromium passivating process during zinc plating - Google Patents
Treatment for rinsig waste water from low chromium passivating process during zinc plating Download PDFInfo
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- CN87102036A CN87102036A CN87102036.XA CN87102036A CN87102036A CN 87102036 A CN87102036 A CN 87102036A CN 87102036 A CN87102036 A CN 87102036A CN 87102036 A CN87102036 A CN 87102036A
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Abstract
The invention provides a kind of treatment for rinsig waste water from low chromium passivating process during zinc plating.The characteristics of this method are that the processing of Cleaning Wastewater is carried out integrated improvement in conjunction with zincincation.Utilize the molysite that produces in the rust cleaning operation to remove to reduce the sexavalent chrome that the plating piece surface is taken out of behind the low chromium passivating and be trivalent chromium, utilize zinc-plated operation after, the alkaline liquid that the plating piece surface is taken out of goes the acid solution of reverse neutralization rust cleaning back piece surface.The present invention has a large amount of water saving, and the treatment of wastes with processes of wastes against one another does not need extra-expense, improvement simply and easily to contain hexavalent chromium wastewater, simultaneously economical with materials advantages such as (plating bath float the required alkalescence of light acid solution and acid-base neutralisation and feeds intake).
Description
The present invention relates to the treatment process of zinc-plated low chromium passivating process flow and chromate waste water thereof.
Common zinc-plated low chromium passivating process flow mainly is: rust cleaning → washing → neutralization → washing → zinc-plated → some roads washing → low chromium passivating → some roads washing, wherein the per pass washing all each has clear water supply and wastewater discharge pipe, and for containing processing tank liquor (acid solution, zinc, the processing of waste water pollution substances such as sexavalent chrome), known improvement method have adopts special equipment clean to reclaim, and this method is effective, but investment is big, and equipment operation and regeneration cost usefulness in addition.Usually with the chemistry improvement that feeds intake, propose in waste water, to add ferrous chloride and dilute sulphuric acid, the hexavalent chrome reduction in the waste water is become trivalent chromium as Japanese Patent JP60-166088; Chinese patent application case 85103000 proposes to react with high concentration chrome wastewater under certain pressure with sulfurous gas; U.S. ERG/Lancy company proposes a kind of trough rim circulating chemical rinsability, and a chemical rinse tank and a rinsing tank are set in the working groove back of plating line, pumps into to chemical rinse tank and contains class such as hydrazine hydrate (N
2H
4), Sodium Metabisulphate 65 (Na
2S
2O
5) wait the chemical bleaching lotion of reductive agent, (pollution substance is as CrO to make the processing tank liquor that brings with electroplated component
3, beavy metal impurity) and play reduction reaction, remove the pollution substance on plating piece surface, make plating piece not be with the pollutent quality to enter the rinsing tank basically, rinse water just can be recycled.The Ou Yangjian of Jinshi City, Hunan proposes " treatment of wastes with processes of wastes against one another ", and with spent acid solution that cleans plating piece and the waste iron filing generation iron protochloride that reacts, as the reductive agent of reduction of hexavalent chromium, this treatment process need be provided with acid, iron reaction tank and reduction of hexavalent chromium reaction tank in addition.More than severally can reach draining matter and meet national strict emission control standards with the feed intake method of handling high concentration chrome wastewater of chemistry, the method that has can also conserve water, the processing costs that has is lower.But total existence needs extra dispensing expense or facility expense, and easy inefficacy and treatment facility account for certain shortcomings such as building site area during the preservation of part medicine.
Task of the present invention is that exploitation does not a kind ofly increase the extra process expense, do not add integrated improvement is carried out in the wastewater treatment of treatment facility in conjunction with zincincation method.
Invention is achieved in that spent acid, the abraum salt that produces in the galvanizing process flow based on utilizing, salkali waste reduce pollution substance sexavalent chrome and purify the treatment of wastes with processes of wastes against one another principle of Cleaning Wastewater.1. remove to reduce the hypertoxic sexavalent chrome that plating piece takes out of with rust cleaning ferrous salt that operation produced in the galvanizing process flow after low chromium passivating is handled.Hydrochloric acid is 1: 1 in rust cleaning operation groove, and the ferric oxide Fe of piece surface is removed in the rust cleaning reaction
2O
3:
After iron rust eliminated, hydrochloric acid is inevitable to react with the iron body, generates iron protochloride:
The rust cleaning parts list is being worn molysite, and ferrous salt and hydrochloric acid enter washing bath, contains sexavalent chrome H after making the Cleaning Wastewater that contains molysite, ferrous salt and hydrochloric acid lead to the low chromium passivating operation
2CrO
4Washing bath, under PH=3～5 conditions, the ferrous salt reduction of hexavalent chromium is a trivalent chromium:
2. with the reverse part that cleans step by step after eliminating rust of the Cleaning Wastewater that contains alkali plating solution after the zinc-plated operation, the alkali in the cleaning process in the water plays neutralization reaction with the hydrochloric acid that the rust cleaning parts list is worn:
This has replaced the neutralizing well that common ad hoc need are thrown alkaline spice.
Advantage of the present invention is to save water for cleaning in a large number, do not need extras and chemistry to feed intake to administer to contain chromium, acid-bearing wastewater, the improvement method is very simple, expensive seldom.
Imagination of the present invention is described in detail in conjunction with the accompanying drawings by following examples.
Fig. 1 is that zinc-plated low chromium passivating main technique is in conjunction with the close-coupled processing schema of Cleaning Wastewater.
Among the figure 1～12nd, working groove in the technical process and washing bath at different levels.B is the clear water water inlet pipe of zinc-plated first washing bath of back (6), establishes pipe B in addition from groove (6)
1Lead to the rust cleaning operation after the 3rd washing bath (4), establish pipe B from groove (4)
2Lead to washing bath (3), establish pipe B from groove (3)
3Lead to washing bath (2), the cleaning of the part that promptly eliminates rust is supplied water step by step by zinc-plated back part Cleaning Wastewater is reverse.Contain alkali (NaOH) in the zinc-plated part clear water waste water, alkali plays neutralization reaction (HCl+NaOH=NaCl+H with the hydrochloric acid that the rust cleaning parts list is worn
2O).The acidity value of actual measurement washing bath (6) is PH=12～14, can be considered soda ash (PH＜7 are for acid, and PH=7 is neutral, and PH＞7 are alkalescence), the groove after neutralization reaction (4) actual measurement PH ≈ 12, groove (3) PH ≈ 10, the PH ≈ 3 of groove (2).Establish pipe B in addition from groove (2)
4Lead to the washing bath (11) after the low chromium passivating operation, hydrochloric and molysite in the Cleaning Wastewater of groove (2), this is that part rust cleaning institute produces and take out of:
Contain the sexavalent chrome that plating piece brings through the low chromium passivating rear surface in the washing bath (11):
PH=3～5 of groove (11), iron protochloride reduction of hexavalent chromium are trivalent chromium:
In the washing bath (11) the last trivalent chromium that generates with water from water shoot E
BFlow to waste water comprehensive treating process station with main discharge pipe E and carry out conventional processing, trivalent chromium generates Cr(OH)
3Precipitation.The precipitation waste residue is sent to concrete precast element factory after drying in the waste water comprehensive treating process station, mixes the middle layer of concrete member.
A is the clear water water inlet pipe of low chromium passivating (10) back second washing bath (12), establishes pipe A from groove (12)
1Lead to the washing bath (9) after the zinc-plated operation (5), establish pipe A from groove (9)
2Lead to washing bath (7), E
AIt is the water shoot of groove (7).The reduction reaction of plating piece behind the low chromium passivating in groove (11) cleaned when entering groove (12), pollution substance has not been with on the surface basically, so the rinse water of groove (12) can be used further to clean, be reverse supplying washing bath (9), because plating piece floats light through floating light groove (8), the surface has acid solution, makes the rinse water of groove (9) contain acid solution, the PH ≈ 1.4 of actual measurement groove (9), the water of groove (9) passes through A
2Supply with groove (7), (zinc-plated part is through the cleaning of groove (6) with the part of micro-alkali plating solution promptly to clean surface after zinc-plated with sour water, the most of plating bath in surface has been cleaned), this is than washing effect with clear water for good, the one side acid-base neutralisation, eliminate the plating bath on plating piece surface, the plating piece surface is entered with the identical composition of the acid solution required with floating light float light groove (8), can save the light acid amount of floating.
The present invention implemented 1 year 01 months, was on 300 tons the zinc-plated streamline 1 annual production, and water consumption saves 74% than original, and 14.68 tons/hour of promptly former water consumptions are now reduced to 3.5 tons/hour; The chromic content of discharge of wastewater mouth＜0.24 mg/litre, be significantly less than emission standard≤0.5 mg/litre of country, plating piece is acidity PH ≈ 6.966 after groove (11) (12) cleans, and neutral water PH=7, illustrate that plating piece is cleaned, the electroplating quality of part also meets the requirements fully.
Claims (4)
1, treatment for rinsig waste water from low chromium passivating process during zinc plating, comprise chemical reduction method, countercurrent rinsing method, the processing that the invention is characterized in Cleaning Wastewater is carried out close-coupled processing in conjunction with zincincation, 1. the Cleaning Wastewater of the washing bath [11] after the low chromium passivating operation [10] after by rust cleaning operation [1] supplies water, contain pollution substance acid solution and molysite in the rust cleaning Cleaning Wastewater, part has hypertoxic hexavalent chromium polluted material through low chromium passivating operation rear surface, reduction reaction takes place in washing bath [11], makes the sexavalence lattice be reduced into trivalent chromium:
PH=3～5 of washing bath [11], 2. the Cleaning Wastewater of the rinse water after the operation that eliminates rust [1] after by zinc-plated operation [5] be reverse supplying step by step, zinc-plated back Cleaning Wastewater contains the alkali plating solution composition, and the alkali in the water plays neutralization reaction with the acid that the rust cleaning parts list is worn, and forms the neutralization reaction countercurrent rinsing:
3. back second washing bath of zinc-plated operation [5] [7] supplies water step by step by the Cleaning Wastewater of low chromium passivating operation [10] back second washing bath [12] is reverse, contain part in the washing bath [9] from floating the acid solution that light groove [8] brings, by groove [9] to the reverse water supply of groove [7], groove [7] Central Plains contains the micro-alkali plating solution that zinc-plated piece surface brings, and acid plays neutralization reaction with alkali.
2,, it is characterized in that the 1st washing bath (11) after first washing bath (2) skirt after the rust cleaning operation (1) leads to low chromium passivating operation (10) by the described treatment process of claim 1.
3, by claim 1 or 2 described treatment processs, washing bath (4) after it is characterized in that from of first washing bath (6) skirt after the zinc-plated operation (5) to rust cleaning operation (1), sub from (4) skirt again, sub from (3) skirt again to washing bath (2) to washing bath (3).
4, by claim 1 or 3 described treatment processs, it is characterized in that leading to washing bath (9) after the zinc-plated operation from second washing bath (12) skirt of low chromium passivating operation (10), lead to washing bath (7) from (9) skirt again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87102036.XA CN1004713B (en) | 1987-06-13 | 1987-06-13 | Treatment for rinsig waste water from low chromium passivating process during zinc plating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87102036.XA CN1004713B (en) | 1987-06-13 | 1987-06-13 | Treatment for rinsig waste water from low chromium passivating process during zinc plating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87102036A true CN87102036A (en) | 1987-12-23 |
| CN1004713B CN1004713B (en) | 1989-07-05 |
Family
ID=4813746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87102036.XA Expired CN1004713B (en) | 1987-06-13 | 1987-06-13 | Treatment for rinsig waste water from low chromium passivating process during zinc plating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004713B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823804A (en) * | 2010-04-27 | 2010-09-08 | 成都四友镀锌设备有限公司 | Waste water zero emission treatment system for hot-dip galvanizing workshop |
| CN101538072B (en) * | 2009-04-23 | 2011-07-27 | 青岛东方铁塔股份有限公司 | Sewage treatment method of galvanization production line |
| CN103132126A (en) * | 2011-12-01 | 2013-06-05 | 天津市大港镀锌厂 | Novel electroplating hard chrome technology method |
| CN109574185A (en) * | 2017-09-28 | 2019-04-05 | 上海梅山钢铁股份有限公司 | A kind of reagent handling hexavalent chromium in organic waste liquid containing chromium passivating |
-
1987
- 1987-06-13 CN CN87102036.XA patent/CN1004713B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538072B (en) * | 2009-04-23 | 2011-07-27 | 青岛东方铁塔股份有限公司 | Sewage treatment method of galvanization production line |
| CN101823804A (en) * | 2010-04-27 | 2010-09-08 | 成都四友镀锌设备有限公司 | Waste water zero emission treatment system for hot-dip galvanizing workshop |
| CN101823804B (en) * | 2010-04-27 | 2012-08-01 | 成都四友镀锌设备有限公司 | Waste water zero emission treatment system for hot-dip galvanizing workshop |
| CN103132126A (en) * | 2011-12-01 | 2013-06-05 | 天津市大港镀锌厂 | Novel electroplating hard chrome technology method |
| CN103132126B (en) * | 2011-12-01 | 2016-06-15 | 天津市大港镀锌厂 | Novel electroplating hard chrome process method |
| CN109574185A (en) * | 2017-09-28 | 2019-04-05 | 上海梅山钢铁股份有限公司 | A kind of reagent handling hexavalent chromium in organic waste liquid containing chromium passivating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1004713B (en) | 1989-07-05 |
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