CN100567170C - Chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water - Google Patents
Chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water Download PDFInfo
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- CN100567170C CN100567170C CNB2007100693984A CN200710069398A CN100567170C CN 100567170 C CN100567170 C CN 100567170C CN B2007100693984 A CNB2007100693984 A CN B2007100693984A CN 200710069398 A CN200710069398 A CN 200710069398A CN 100567170 C CN100567170 C CN 100567170C
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Abstract
The invention discloses a kind of treatment process of acid waste water, refer in particular to the extracting method of chromium, nickel salt in a kind of stainless steel acid waste water.The present invention is by removing objectionable impurities in the acid waste water stage by stage, added calcium salt before this, and control pH is 2.0～4.0, removes fluoride ion, add highly basic or soda ash again, control pH is 7.0～8.0, after filtration, can effectively realize qualified discharge liquid, again the filter residue after filtering is carried out the acidifying oxidizing reaction with acid solution, control pH is 1.0～4.0, filters the iron ion of removing wherein, is precious metal chromium, the nickel salt of extraction in the remaining filtrate.Advantage of the present invention is, can reduce the add-on of calcium salt, highly basic or soda ash, can realize the qualified discharge of liquid, and can not cause the situation of heavy metal secondary pollution, recycles chromium, nickel salt, effectively increases economic efficiency.The present invention can be widely used in the wastewater treatment of various stainless steel manufacturing concern, and similar enterprises.
Description
Technical field
The present invention relates to extract in a kind of acid waste water the method for metal-salt, refer in particular to the method for extracting chromium, nickel salt in a kind of stainless steel acid waste water.
Technical background
The processing of existing stainless steel acid cleaning waste water is adopted substantially: aeration, neutralization, sedimentary method, because traditional method is not considered the heavy metal in the waste water and is reclaimed, just think of handling qualified discharge, so the overall operation cost is too high, and the mud that press dry often owing to mishandlingly cause the heavy metal secondary pollution easily, be the more important thing is and can be caused the wasting of resources.In stainless steel acid waste water, contain a large amount of iron, chromium, nickel salt.At present, enterprise generally handles allow compliance with emission standards with acid waste water, promptly discharged, but such discharging still has very big problem, the one, iron wherein, chromium, nickel salt is along with discharging forms secondary pollution, and the 2nd, in the treating processes that present enterprise carries out for discharging, use alkali lye in a large number, the consumption of medicament also is very big, and Financial cost is bigger.Carry out wastewater treatment so how to reduce cost, can avoid the appearance of secondary pollution simultaneously, become the important subject of enterprise.
Summary of the invention
The present invention is directed to deficiency of the prior art, but proposed the method for chromium, nickel salt in a kind of easy to operate efficient recovery stainless steel waste water.
The present invention is achieved by following technical proposals:
Chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water, it comprises the following steps:
(1) waste water with as the magnesium salts of neutralizing agent A or calcium salt reaction, and to make reaction back waste water ph be 2.0～4.0;
(2) waste water after the above-mentioned reaction is precipitated at settling tank, and filter and remove solids;
(3) with the highly basic or the soda ash that add in the filtrate as neutralizing agent B, regulating the pH value is 6.5～8.5;
(4) again reactant is filtered discharging filtrate at settling tank;
(5) add acid in filtrate, carry out acidifying or oxidizing reaction, regulating the pH value is 1～4;
(6) filter the removal solids, can contain chromic salts and nickel salt filtrate.
As preferably, above-mentioned extracting method, described magnesium salts as neutralizing agent A is MgCO
3, calcium salt is CaCO
3, can be effectively the F in the waste water
-Remove, and effect is preferable.Simultaneously, can select Ca (OH) for use
2, Mg (OH)
2Deng calcic, magnesium material, also has certain effect.
As preferably, above-mentioned extracting method, described waste water and calcium salt or magnesium salts reaction as neutralizing agent A, the pH value is 2.5～3.5.
As preferably, above-mentioned extracting method, described waste water is to carry out in the aeration tank with magnesium salts or calcium salt reaction as neutralizing agent, can fully react, and raise the efficiency, and realizes the maximization of economic interests.Gas when aeration: liquor ratio is 10～30: 1, and aeration time was generally 1～2 hour, also fully takes into account simultaneously the difference of component content in the waste water, and correspondingly takes different measures, so that the carrying out fully of realization response.
As preferably, above-mentioned extracting method, it is described that to add highly basic in filtrate be NaOH or KOH.
As preferably, above-mentioned extracting method, the pH value that described waste water adds behind highly basic or the soda ash is 6.5～7.5.At this compared with prior art, have remarkable advantages, general present treatment technology in order to realize allow compliance with emission standards, tends to add alkali to pH9, even more than the pH9.And pH value of the present invention is regulated, and then obviously has the alkali of saving consumption.
As preferably, above-mentioned extracting method describedly will add being reflected in the aeration tank of highly basic or soda ash and carry out in filtrate, can guarantee the thorough mixing contact of reactant, and react completely.Gas when aeration: liquor ratio is 10～30: 1, and aeration time was generally 1～2 hour, also fully takes into account simultaneously the difference of component content in the waste water, and correspondingly takes different measures, so that the carrying out fully of realization response
As preferably, above-mentioned extracting method, when carrying out acidifying or oxidizing reaction, described filtrate adds sulfuric acid, regulating the pH value is 1.5～3.0, and trivalent iron salt also is to be insoluble in the solution under acidic conditions, and can remove after filtration, and the feed liquid that stays mainly contains the mixture of chromic salts and nickel salt, not only can avoid secondary pollution, and can reclaim noble metal, increase economic benefit.
As preferably, chromic salts and nickel salt extracting method in above-mentioned a kind of stainless steel acid cleaning waste water after described filtrate is carried out acidifying or oxidizing reaction, add highly basic or soda ash again, and regulating the pH value is 3.0～4.0, then has better effect.
Beneficial effect: when handling the stainless steel acid cleaning waste water qualified discharge, reclaim the chromic salts, the nickel salt that contain in the waste water simultaneously, produce favorable economic benefit, environmental benefit, and simple to operate, control convenience.
Description of drawings
Fig. 1 is a stainless steel process for treating acidic sewage schematic flow sheet
Embodiment
Below in conjunction with accompanying drawing, implementation process of the present invention is specified:
Embodiment one: press implementation process shown in the accompanying drawing, take from 1 liter of the factory effluent of certain stainless steel company, through recording: contain chromium, nickel concentration is 120mg/L.Add milk of lime 3 grams subsequently, stir, recording pH is 3.8, leave standstill after-filtration, remove solids, filtrate is restrained with soda ash 2 again, recording pH is 7.8, filters again, and filtrate can be discharged, add sulfuric acid toward the solid filter residue again, regulate pH to 1.8, filter once more, solids is removed, and wherein containing major ingredient is molysite, and filtered liquid is and contains chromium, nickel salt solution, record and contain chromium 9 grams per liters, nickel 10.8 grams per liters.
Embodiment two: press the same method of embodiment one, take from 1 liter of the factory effluent of certain stainless steel company, through recording: contain chromium, nickel concentration is 130mg/L.Add milk of lime 3.2 grams subsequently, stir, recording pH is 3.0, leave standstill after-filtration, remove solids, filtrate is restrained with soda ash 2.3 again, recording pH is 7.3, filters again, and filtrate can be discharged, add hydrochloric acid toward the solid filter residue again, regulate pH to 1.5, filter once more, solids is removed, and wherein contains the major ingredient molysite, and filtered liquid is and contains chromium, nickel salt solution, record and contain chromium 9.4 grams per liters, nickel 12.1 grams per liters.
Embodiment three: press the same method of embodiment one, take from 1 liter of the factory effluent of certain stainless steel company, handle, draw tabulation (recording by implementation step).
Claims (8)
1, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water is characterized in that comprising the following steps:
(1) waste water with as the magnesium salts of neutralizing agent A or calcium salt reaction, and to make reaction back waste water ph be 2.0～4.0;
(2) waste water after the above-mentioned reaction is precipitated at settling tank, and filter and remove solids;
(3) with the highly basic or the soda ash that add in the filtrate as neutralizing agent B, regulating the pH value is 6.5～8.5;
(4) again reactant is filtered discharging filtrate at settling tank;
(5) add acid in filtrate, carry out acidifying or oxidizing reaction, regulating the pH value is 1.0～3.0;
(6) add highly basic or soda ash again in the filtration, regulating the pH value is 3.0～4.0, removes solids, can contain chromic salts and nickel salt filtrate.
2, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water according to claim 1 is characterized in that described magnesium salts as neutralizing agent A is MgCO
3, calcium salt is CaCO
3
3, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water according to claim 1 and 2 is characterized in that described reaction back waste water ph is 2.5～3.5.
4, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water according to claim 1 is characterized in that described waste water and are to carry out in the aeration tank as the magnesium salts of neutralizing agent A or calcium salt reaction.
5, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water according to claim 1 is characterized in that described adding highly basic is NaOH or KOH.
6, chromic salts and nickel salt extracting method in a kind of according to claim 1 or 5 stainless steel acid cleaning waste water is characterized in that the pH value behind described waste water adding highly basic or the soda ash is 6.5～7.5.
7, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water according to claim 1 is characterized in that being reflected in the aeration tank of described adding highly basic or soda ash carry out.
8, chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water according to claim 1 is characterized in that adding sulfuric acid when described filtrate is carried out acidifying or oxidizing reaction, and regulating the pH value is 1.5～3.0.
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| CNB2007100693984A CN100567170C (en) | 2007-06-22 | 2007-06-22 | Chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water |
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| CNB2007100693984A CN100567170C (en) | 2007-06-22 | 2007-06-22 | Chromic salts and nickel salt extracting method in a kind of stainless steel acid cleaning waste water |
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| CN100567170C true CN100567170C (en) | 2009-12-09 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618892B (en) * | 2009-07-31 | 2011-06-08 | 东南大学 | Recovery and comprehensive utilization method of heavy metals in stainless steel pickling wastewater sludge |
| EP2447219A1 (en) * | 2010-10-28 | 2012-05-02 | Recoval Belgium | Method for purifying waste water from a stainless steel slag treatment process |
| CN102181647B (en) * | 2011-04-14 | 2015-04-22 | 陈启松 | Method for extracting chromated nickel from low-grade stainless steel sludge by using stainless steel acid-washing waste mother liquor |
| CN102730877A (en) * | 2011-04-15 | 2012-10-17 | 宝山钢铁股份有限公司 | Technology and device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel |
| CN102381748A (en) * | 2011-09-22 | 2012-03-21 | 陈启松 | Method for reducing content of sludge chromate nickel by utilizing acid to adjust back during stainless steel wastewater treatment |
| CN102553387B (en) * | 2012-02-17 | 2014-05-07 | 新兴铸管股份有限公司 | Secondary dust removal system for stainless steel smelting and ordinary steel smelting |
| CN103508541B (en) * | 2012-06-29 | 2015-08-19 | 中国科学院过程工程研究所 | A kind of method that heavy metal waste slag removing toxic substances, acid heavy metal wastewater resource utilization are reclaimed |
| CN102923885B (en) * | 2012-11-15 | 2013-08-14 | 陈启松 | Method for recovering iron sludge from stainless steel scraps recovered with chromium and nickel |
| CN105293774A (en) * | 2015-11-18 | 2016-02-03 | 金川集团股份有限公司 | Method for increasing recovery rate of precious metals in waste liquid |
| CN106498171A (en) * | 2016-12-05 | 2017-03-15 | 张圆圆 | The recoverying and utilizing method of nickel and chromium in a kind of stainless steel |
| CN108047763B (en) * | 2017-12-12 | 2020-09-29 | 佛山市大千色釉料有限公司 | Ceramic pigment and preparation method thereof |
| CN108928953A (en) * | 2018-06-29 | 2018-12-04 | 中国科学院过程工程研究所 | A kind of method of stainless steel acid cleaning waste water recycling |
| CN109354288B (en) * | 2018-11-09 | 2021-09-14 | 常州润德石墨科技有限公司 | Method for treating stainless steel pickling wastewater |
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2007
- 2007-06-22 CN CNB2007100693984A patent/CN100567170C/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 工业酸洗废水中和法处理工艺的研究. 李文婷，余占奎，张春霞，施凤英.甘肃科学学报，第18卷第1期. 2006 |
| 工业酸洗废水中和法处理工艺的研究. 李文婷，余占奎，张春霞，施凤英.甘肃科学学报，第18卷第1期. 2006 * |
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| CN101096276A (en) | 2008-01-02 |
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