CN100390077C - Reclaiming and utilizing method of sulfuric acid production wastewater - Google Patents
Reclaiming and utilizing method of sulfuric acid production wastewater Download PDFInfo
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- CN100390077C CN100390077C CNB2006100000153A CN200610000015A CN100390077C CN 100390077 C CN100390077 C CN 100390077C CN B2006100000153 A CNB2006100000153 A CN B2006100000153A CN 200610000015 A CN200610000015 A CN 200610000015A CN 100390077 C CN100390077 C CN 100390077C
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- waste water
- sulfuric acid
- acid production
- production wastewater
- chromate
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Abstract
The present invention relates to a recovering and using method of sulfuric acid production waste water. The sulfuric acid production waste water is proportionally mixed with chromate containing waste water, and the pH value is adjusted. SO2 in the sulfuric acid production waste water can reduce Cr<6+> in the chromate containing waste water into Cr<3+>, and therefore, toxins (mainly water soluble chromium) in the chromate containing waste water are removed. The present invention can not increase investment and can detoxicating the chromate containing waste water without any special devices. The present invention not only can process the waste water generated in sulfuric acid production, but also can detoxicate the chromate containing waste water generated in chromium salt production, and the present invention has no secondary pollution.
Description
Technical field:
The present invention reclaims for a kind of sulfuric acid production wastewater and utilizes method, particularly utilizes sulfuric acid production wastewater to handle the method for chromium slag.
Background technology:
In the current gas washing in SA production, it is main adopting pyrite-based sulfuric acid production.Pyrite-based sulfuric acid production always has sour water to discharge.Sulfuric acid wastewater containing has the characteristics that colourity is big, acidity is high usually, and it mainly contains harmful substances is sulfuric acid, sulfurous acid, mine dust, arsenic, fluorine and multiple metal ion etc.Waste water is as directly entering rivers, with the severe contamination water body.
Discharge a large amount of chromate waste waters in the current chromium salt production, will pollute environment as not handling.
At present, existing about adopting spent acid to handle the report of chromium slag.For example, inorganic chemicals industry, in 2001 (5), people such as Tang Dongxiu have reported to adopt and have contained acid waste liquid and produce ferrous sulfate, and with its method that solid waste chromium slag is handled; Reported the interaction that utilizes chromium slag and spent acid among the CN1114508C, sharp giving up controlled useless method, wherein, contains the reducing substance ferrous sulfate in the spent acid, adopts it to come reduction of hexavalent chromium; Report the spent acid that utilizes Titanium White Production By Sulfuric Acid Process to produce among the CN1562510A, adopted the method for the ferrous sulfate reduction of hexavalent chromium that contains in the spent acid; Reported among the CN1635170A and adopted spent acid to handle the method for chromium slag under ultrasound condition, the spent acid of employing is still the spent acid that contains ferrous sulfate.
Above method is handled the chromium slag to spent acid and has been made good try.But seeking more mode and handle spent acid and chromium waste material, still is exactly that industrial production and environmental improvement are needed.
Summary of the invention
The method that the object of the present invention is to provide a kind of new sulfuric acid production wastewater to reclaim and utilize can turn waste into wealth it.
Specifically, the present invention relates to the method that a kind of sulfuric acid production wastewater reclaims and utilizes, it is characterized in that using sulfuric acid production wastewater to come processing waste water containing chrome.
The present invention utilizes the SO that contains in the sulfuric acid production wastewater
2Fully the sexavalent chrome in the reduction chromate waste water makes sexavalent chrome can obtain reducing more completely.The chromium throw out that contains that produces in the reduction process can be used as the cement admixture.Non-secondary pollution.
In specific embodiments, the inventive method adopts for example following steps:
1, sulfuric acid production wastewater is mixed with chromate waste water, the ratio of two kinds of waste water is looked the Cr in the chromate waste water
6+SO in content and the sulfuric acid production wastewater
2Content content decides.Generally add with the ratio of the relative chromate waste water of sulfuric acid production wastewater excessive 10%～99.9%.By stoichiometry, Cr
6+: SO
2=1: more than 1.5, Cr preferably
6+: SO
2=1: 1.5-1: 2.
2, add hydrochloric acid or sulfuric acid in waste water, regulating its pH value is 2～4, makes the SO in the sulfuric acid production wastewater
2Sexavalent chrome in the chromate waste water is reduced fully.
3, after the sexavalent chrome in the chromate waste water is reduced fully, in waste water, add NaOH or Na
2CO
3Or carbide slag or NaHCO
3Or unslaked lime neutralizes.
4, the later waste water that will neutralize precipitates or filters.The waste residue that produces can be used as the cement admixture.Non-secondary pollution.
Different with ferrous sulfate that prior art adopts processing sexavalent chrome, what the present invention adopted is gas washing in SA production liquid waste disposal chromate waste water, mainly is to utilize the SO that wherein contains
2The present invention does not increase investment, can detoxify to chromate waste water without any need for Special Equipment.Both handled the waste water that produces in the gas washing in SA production, again the chromate waste water that has that produces in the chromium salt production had been detoxified.And non-secondary pollution.
Embodiment
The invention will be further described hereinafter to adopt indefiniteness embodiment.
Embodiment 1
1, (pH value is 1.8, As 102mg/L, F 306mg/L, Fe 23mg/L, Cu1.5mg/L, Zn 20mg/L, Pb 3.7mg/L, SO with 1 ton of sulfuric acid production wastewater
21.3%) joins (Cr in 8 tons of chromate waste waters
6+Content 2ppm).
2, adjusting its pH value with sulfuric acid is 2.6.
3, treat to use Na after the fully reaction
2CO
3Neutralize.Adjusting its pH value is 7.
4, the later solution that will neutralize filters, and removes dregs.Solution detected result after the filtration: pH value is 7.1, Cr
6+Be zero, As 0.12mg/L, F12.80mg/L, Fe 2.8mg/L, Cu does not detect, and Zn does not detect, and Pb does not detect, and total acidity is 0.
Embodiment 2
1, (pH value is 1.8, As 102mg/L, F 306mg/L, Fe 23mg/L, Cu1.5mg/L, Zn 20mg/L, Pb 3.7mg/L, SO with 2 tons of sulfuric acid production wastewaters
21.3%) joins (Cr in 8 tons of chromate waste waters
6+Content 4PPM).
2, adjusting its pH value with sulfuric acid is 2.6.
3, treat to use Na after the fully reaction
2CO
3Neutralize.Adjusting its pH value is 7.
4, the later solution that will neutralize filters, and removes dregs.Solution detected result after the filtration: pH value is 7.2, Cr
6+Be zero, As 0.11mg/L, F12.50mg/L, Fe 2.9mg/L, Cu does not detect, and Zn does not detect, and Pb does not detect, and total acidity is 0.
Claims (5)
1. the method that sulfuric acid production wastewater reclaims and utilizes is characterized in that the waste water that will produce in the gas washing in SA production mixes with chromate waste water, and the ratio of two kinds of waste water is looked the Cr in the chromate waste water
6+SO in content and the sulfuric acid production wastewater
2Content decides, by stoichiometry mole, Cr
6+: SO
2=1: 1.5-1: 2.
2. method according to claim 1, it is characterized in that mixing the back is 2～4 with hydrochloric acid or sulfuric acid adjustment pH value scope.
3. method according to claim 2 is characterized in that after the PH adjustment, treats that the detoxifcation reaction finishes, with NaOH or Na
2CO
3Or carbide slag or NaHCO
3Or unslaked lime neutralizes.
4. method according to claim 3 is characterized in that utilizing unslaked lime or NaOH or Na
2CO
3Or NaHCO
3Or in the carbide slag and PH be 6～8.
5. method according to claim 1, it comprises the steps:
1) sulfuric acid production wastewater is mixed with chromate waste water, the ratio of two kinds of waste water is looked the Cr in the chromate waste water
6+SO in content and the sulfuric acid production wastewater
2Content decides, by stoichiometry mole, Cr
6+: SO
2=1: 1.5-1: 2;
2) add hydrochloric acid or sulfuric acid in waste water, regulating its pH value is 2～4, makes the SO in the sulfuric acid production wastewater
2Sexavalent chrome in the chromate waste water is reduced fully;
3) after the sexavalent chrome in the chromate waste water is reduced fully, in waste water, add NaOH or Na
2CO
3Or NaHCO
3Or carbide slag or unslaked lime neutralize;
4) the later waste water that will neutralize precipitates or filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100000153A CN100390077C (en) | 2006-01-04 | 2006-01-04 | Reclaiming and utilizing method of sulfuric acid production wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100000153A CN100390077C (en) | 2006-01-04 | 2006-01-04 | Reclaiming and utilizing method of sulfuric acid production wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1803655A CN1803655A (en) | 2006-07-19 |
| CN100390077C true CN100390077C (en) | 2008-05-28 |
Family
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|---|---|---|---|
| CNB2006100000153A Expired - Fee Related CN100390077C (en) | 2006-01-04 | 2006-01-04 | Reclaiming and utilizing method of sulfuric acid production wastewater |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320697A (en) * | 2011-05-31 | 2012-01-18 | 重庆民丰化工有限责任公司 | Desulfuration process for chromate waste water |
| CN102887544B (en) * | 2012-09-13 | 2013-12-18 | 四川省银河化学股份有限公司 | Method for heating and detoxifying hexavalent chromium by utilizing electric heating tube and application for method |
| CN103521513B (en) * | 2013-10-18 | 2015-04-01 | 中国科学院南京土壤研究所 | Leaching method of soil polluted by hexavalent chromium |
| CN118978275A (en) * | 2024-07-23 | 2024-11-19 | 宝武水务科技有限公司 | Treatment method and system for stainless steel sulfuric acid wastewater and electrolytic wastewater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1237543A (en) * | 1999-06-04 | 1999-12-08 | 河北省冶金设计研究院 | Method for treating waste water produced by electroplating process |
| CN1556048A (en) * | 2004-01-12 | 2004-12-22 | 东风汽车紧固件有限公司 | Chromium containing waste water treatment method |
-
2006
- 2006-01-04 CN CNB2006100000153A patent/CN100390077C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1237543A (en) * | 1999-06-04 | 1999-12-08 | 河北省冶金设计研究院 | Method for treating waste water produced by electroplating process |
| CN1556048A (en) * | 2004-01-12 | 2004-12-22 | 东风汽车紧固件有限公司 | Chromium containing waste water treatment method |
Non-Patent Citations (6)
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|---|
| 以废治废的可行性探索-----沈阳市高浓度废液的综合治理. 徐云川，徐洪波.环境保护科学，第26卷第1期. 2000 |
| 以废治废的可行性探索-----沈阳市高浓度废液的综合治理. 徐云川，徐洪波.环境保护科学，第26卷第1期. 2000 * |
| 沈阳市含铬废液集中处理试验研究. 张帆，方旭，葛恒俊.环境保护科学，第23卷第5期. 1997 |
| 沈阳市含铬废液集中处理试验研究. 张帆，方旭，葛恒俊.环境保护科学，第23卷第5期. 1997 * |
| 用轧钢废酸处理硅钢厂含铬废水的研究. 颜家保，李永成，王光辉，吕芹，张俊，王敬，杜健敏.冶金能源，第24卷第4期. 2005 |
| 用轧钢废酸处理硅钢厂含铬废水的研究. 颜家保，李永成，王光辉，吕芹，张俊，王敬，杜健敏.冶金能源，第24卷第4期. 2005 * |
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|---|---|
| CN1803655A (en) | 2006-07-19 |
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Owner name: SICHUAN GALAXY CHEMICAL CO., LTD. Free format text: FORMER NAME: YINHE JIANHUA GROUP CO., LTD., AN COUNTY, SICHUAN |
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| CP01 | Change in the name or title of a patent holder |
Address after: 621000 Mianyang City, Sichuan province county water town. Patentee after: Sichuan Yinhe Chemical Co., Ltd. Address before: 621000 Mianyang City, Sichuan province county water town. Patentee before: Yinhe Jianhua Group Co., Ltd., An County, Sichuan |
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Granted publication date: 20080528 Termination date: 20180104 |
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