CN1041741A - Treatment Methods of Cyanide Wastewater - Google Patents
Treatment Methods of Cyanide Wastewater Download PDFInfo
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- CN1041741A CN1041741A CN 88107215 CN88107215A CN1041741A CN 1041741 A CN1041741 A CN 1041741A CN 88107215 CN88107215 CN 88107215 CN 88107215 A CN88107215 A CN 88107215A CN 1041741 A CN1041741 A CN 1041741A
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- cyanogen
- tower
- cyanide wastewater
- absorption
- waste water
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- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a kind of being applicable to the coal is the big low method for treating waste liquid of cyanogen concentration that contains of wastewater flow rates such as the gentle gasification washes of ammonia washes of raw material, the characteristics of this law are: select for use two rotating stream tray scrubbers for removing the cyanogen tower, make the cyanogen in the waste water be come out to enter gas phase by air stripping, and then to adopt two rotating stream tray scrubbers be the absorption tower, absorbs the air-flow that contains prussic acid that extracts except that the cyanogen tower and make it be converted into yellow prussiate of potash with containing iron alkali solution.Can do the recirculated water repeated use through the waste water that technical process of the present invention is handled, realize the closed cycle of water, effect a radical cure the public hazards of cyanide wastewater, the byproduct yellow prussiate of potash that is obtained can be made industrial chemicals.
Description
The present invention relates to handling the used a kind of cyanogen method of removing of neutrality or acid cyanide wastewater, this law is that to be specially adapted to the coal be that the ammonia washes of raw material and coalification air purge are washed the technological process that wastewater flow rate such as waste water contains the low liquid waste disposal of cyanogen concentration greatly and reclaims prussiate.
Known treatment Methods of Cyanide Wastewater has many kinds.The summary document can be divided into three kinds of approach haply, can reach the purpose that the amount of purifying liquid waste contains the low waste liquid of cyanogen concentration greatly.First method is chemical precipitation and oxygenolysis method, promptly adds pharmaceutical chemicals and microbial cells, and purpose is to make it produce sedimentary prussiate or cyanogen is degraded to harmless material.The water yield is big because it is low that coal generating gas waste water contains cyanogen concentration, and organism is few, and it is just effective to need to add a large amount of pharmaceutical chemicalss and microbial fermenters, so process cost is big.Second method is an aeration, even the cyanogen in the waste water is transferred to gas phase by liquid phase, shortcoming is a long flow path, and the residence time is long, though waste water can reuse, does not solve the problem of cyanogen environmental pollution.The third method is an oxidation pond process, and the waste water that comes out from the gas making workshop flows into settling tank and removes coal ash, flows into the huge oxidation pond of volume again, makes its aeration natural oxidation and slowly evaporation, and suspended substance further precipitates and waste water is purified.This method needs the very big oxidation pond of floor space and does not also solve problem of environmental pollution.
Handle high cyanide containing wastewater, some reports are also arranged both at home and abroad, wherein more effective such as the steam stripped method, it is at the volatile characteristics that go out prussic acid of acid cyanide wastewater, method with steam stripped reclaims dilute prussic acid from the high density cyanide bearing waste solution, and then absorbs, produces yellow prussiate of potash with iron and yellow soda ash (potassium).Yet adopting steam stripped method processing wastewater flow rate to contain the low waste liquid of cyanogen concentration greatly obviously loses more than gain.Above-mentioned processing method has obtained sufficient description in " synthetic ammonia and ammonia processing sewage disposal condition survey report " documents such as (1985) that investigation group of chemical fertilizer department of the Ministry of Chemical Industry did.Yet, through Guangdong Province's international online retrieval centre retrieves and a large amount of hand inspections, handle the method that wastewater flow rate contains the low waste liquid of cyanogen concentration greatly to being applicable to, all do not find any relevant report.
The objective of the invention is to avoid above-mentioned weak point of the prior art and provide that a kind of equipment is simple, process cost is few, can administer the cyanide wastewater environmental pollution and can reclaim the processing method of prussiate, economical and solve the governing problem of the cyanide wastewater of thousands of coal generating gas synthesis ammonia plant of China and coalification gas factory effectively.
The invention provides the method that a kind of waste water removes cyanogen and can reclaim prussiate, the characteristics of this method are: select for use two rotating stream tray scrubbers for removing the cyanogen tower, cyanogen in removing the cyanogen tower in the waste water is come out to enter gas phase by air stripping, and then to adopt two rotating stream tray scrubbers be the absorption tower, absorbs the air-flow that contains prussic acid and make it be converted into yellow prussiate of potash with iron content alkali lye.This method comprises:
(1) first remove cyanogen top of tower spray and cyanide wastewater down with in tower, become reverse the contact by the air that enters except that the cyanogen tower bottom, the cyanogen stripping in the above-mentioned waste water is come out to enter gas phase, contain the prussic acid air-flow thereby produce;
(2) the first decyanation waste water that removes the discharge of cyanogen tower is introduced second and remove cyanogen tower, decyanation once more;
(3) enter the bottom, absorption tower and in the absorption tower, become counter current contact from first and second prussic acid air-flow that contains that removes that the cyanogen top of tower comes out with iron content mixed ammonium/alkali solutions under by the absorption tower top spray, with the prussic acid in the abundant absorption said flow, and make it produce yellow prussiate of potash (K
4Fe(CN)
63H
2O);
(4) the iron content mixed ammonium/alkali solutions injects absorption tower internal recycle use, and is saturated until this solution.
Aforesaid flow process provided by the invention is removed the vapour-liquid ratio that adopts in cyanogen tower and absorption tower and is 1: the 4(liter: rice
3).
The used key equipment of the present invention is to remove cyanogen tower and absorption tower, and both preferably all select rotating stream tray scrubber for use.
The optimum formula that the present invention absorbs the iron content mixed ammonium/alkali solutions of prussic acid air-flow is 6 moles K
2CO
3Or Na
2CO
3With 2 moles of Fe(OH)
2Mixing solutions.
For the present invention can be understood better, now,, narrate a preferred embodiment of the present invention with reference to accompanying drawing, this only enumerates as an example.
Accompanying drawing has provided the process flow diagram that cyanide wastewater is handled.
1,2 for removing the cyanogen tower in the accompanying drawing; 3,4 is the absorption tower; 5 is sewage lagoon; 6,9,13,16 be pump; 7 is spinner-type flowmeter; 8 are the buffering basin; 10 is retention basin; 11,14 is gas blower; 12,15 is storage tank; 178 is concentration kettle; 18 is whizzer.
The equipment scale of this experiment is 4 tons of Treatment of Cyanide-containing Wastewater per hour, removes cyanogen tower 1,2 diameters and is 400 millimeters, and height is 3200 millimeters; Absorption tower 3,4 diameters are 300 millimeters, and height is 2600 millimeters.
Cyanide wastewater at first flows into sewage lagoon 5, in sewage lagoon 5, stop more than 10 minutes or 10 minutes, enter except that cyanogen tower 1 top through spinner-type flowmeter 7 by pump 6, by top of tower spray and down with become counter current contact by the air that enters except that cyanogen tower 1 bottom, so that the cyanogen stripping in the above-mentioned waste water is come out to enter gas phase, carry out the one-level decyanation, produce and contain the prussic acid air-flow.Waste water after the one-level decyanation is introduced buffering storage tank 8, by pump 9 get to except that the top spray of cyanogen tower 2 and down with meet once more by the air that enters except that cyanogen tower 2 bottoms, thereby decyanation once more.After the waste water after twice decyanation contains the cyanogen amount and reduces to below the 2.4mg/L, to introduce retention basin 10 and be cooled to below 30 ℃ at this, the recirculated water that is re-used as the gas making operation is reused.
From the prussic acid air-flow is blasted the bottom of absorption tower 3 and 4 and absorption tower 3 and 4 top sprays by gas blower 11,14 respectively containing of removing that cyanogen tower 1 and 2 tops come out and under the iron content mixed ammonium/alkali solutions (be 6 moles K
2CO
3With 2 moles of Fe(OH)
2Solution) become counter current contact with the prussic acid in the abundant absorption said flow.
The configuration in storage tank 12,15 respectively of iron content mixed alkali liquor, make it in absorption tower 3 and 4, to recycle by pump 13,16 again, saturated and the transformation generation yellow prussiate of potash until this solution, at this moment this saturated solution is put into concentration kettle 17 inspissations, thereby produce the yellow prussiate of potash crystallization, filter through whizzer 18 and obtain the byproduct yellow prussiate of potash.
The present invention has following advantage compared to existing technology:
1. adopt method Treatment of Cyanide-containing Wastewater provided by the present invention, remove cyanogen efficient up to 80～92%, sulfur removal effectiveness reaches 91～98%, (calculating according to the data that Guangzhou Environmental Monitoring Center's survey report provides).
2. technological process of the present invention is simple, easy to operate, small investment, through the coal generating gas washes decyanation that technological process of the present invention is processed, the recirculated water that can be used as the gas making operation after the desulfurization is reused, and has realized the closed cycle of water, there is not cyanide wastewater to discharge, the public hazards of therefore having effected a radical cure cyanide wastewater.
3. recommending an important feature of the present invention is to be specially adapted to process wastewater flow rate to contain greatly the low coal generating gas washes of cyanogen concentration, it has not only realized the closed cycle of above-mentioned washes, thoroughly solved problem of environmental pollution, and can from waste water, reclaim cyanogen and obtain the byproduct potassium ferrocyanide, the value of this byproduct potassium ferrocyanide is also had a surplus after compensating for operating cost as calculated.
As seen by above-mentioned, this is invented existing social benefit and has an economic benefit again.
Claims (3)
1, treatment Methods of Cyanide Wastewater comprises key steps such as decyanation, absorption, the invention is characterized in:
1. first remove cyanogen top of tower spray and cyanide wastewater down with in tower, become reverse the contact by the air that enters except that the cyanogen tower bottom, the cyanogen stripping in the above-mentioned waste water is come out to enter gas phase, contain the prussic acid air-flow thereby produce;
2. the first decyanation waste water that removes the discharge of cyanogen tower is introduced second and is removed cyanogen tower, decyanation once more;
3. enter the bottom, absorption tower and in the absorption tower, become counter current contact from first and second prussic acid air-flow that contains that removes that the cyanogen top of tower comes out with iron content mixed ammonium/alkali solutions under by the absorption tower top spray, with the prussic acid in the abundant absorption said flow, and make it produce yellow prussiate of potash.
2, treatment Methods of Cyanide Wastewater according to claim 1 is characterized in that removing the vapour-liquid ratio that adopts in cyanogen tower and absorption tower and is 1: 4(liter: rice
3).
3, according to claim 1,2 described treatment Methods of Cyanide Wastewater, the iron content mixed ammonium/alkali solutions optimum formula that it is characterized in that absorbing prussic acid gas is 6 moles K
2CO
3Or Na
2CO
3With 2 moles of Fe(OH)
2Mixing solutions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107215 CN1018175B (en) | 1988-10-13 | 1988-10-13 | Method for treating cyanide containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107215 CN1018175B (en) | 1988-10-13 | 1988-10-13 | Method for treating cyanide containing waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041741A true CN1041741A (en) | 1990-05-02 |
| CN1018175B CN1018175B (en) | 1992-09-09 |
Family
ID=4834565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88107215 Expired CN1018175B (en) | 1988-10-13 | 1988-10-13 | Method for treating cyanide containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1018175B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274806B (en) * | 2007-03-30 | 2010-09-29 | 北京清华紫光英力化工技术有限责任公司 | Novel process for reclaiming waste water containing CN- and NH3 or NH4- |
| CN102060348A (en) * | 2010-07-16 | 2011-05-18 | 华东理工大学 | Tower type air stripping device for treating chlorinated hydrocarbon polluted underground water |
| CN104649363A (en) * | 2014-11-28 | 2015-05-27 | 牌洪坤 | Method for cyanide-containing wastewater treatment by means of high-pressure micro atomization |
| CN110216135A (en) * | 2019-07-16 | 2019-09-10 | 科盛环保科技股份有限公司 | A kind of multistage decyanation tower of cyanamide waste residue |
-
1988
- 1988-10-13 CN CN 88107215 patent/CN1018175B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274806B (en) * | 2007-03-30 | 2010-09-29 | 北京清华紫光英力化工技术有限责任公司 | Novel process for reclaiming waste water containing CN- and NH3 or NH4- |
| CN102060348A (en) * | 2010-07-16 | 2011-05-18 | 华东理工大学 | Tower type air stripping device for treating chlorinated hydrocarbon polluted underground water |
| CN102060348B (en) * | 2010-07-16 | 2012-08-01 | 华东理工大学 | Tower type air stripping device for treating chlorinated hydrocarbon polluted underground water |
| CN104649363A (en) * | 2014-11-28 | 2015-05-27 | 牌洪坤 | Method for cyanide-containing wastewater treatment by means of high-pressure micro atomization |
| CN104649363B (en) * | 2014-11-28 | 2016-04-13 | 牌洪坤 | A kind of method of high-pressure micro-mist method Treatment of Cyanide-containing Wastewater |
| CN110216135A (en) * | 2019-07-16 | 2019-09-10 | 科盛环保科技股份有限公司 | A kind of multistage decyanation tower of cyanamide waste residue |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1018175B (en) | 1992-09-09 |
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