CN1012357B - Method for recovery of cyanide - Google Patents
Method for recovery of cyanideInfo
- Publication number
- CN1012357B CN1012357B CN 87107312 CN87107312A CN1012357B CN 1012357 B CN1012357 B CN 1012357B CN 87107312 CN87107312 CN 87107312 CN 87107312 A CN87107312 A CN 87107312A CN 1012357 B CN1012357 B CN 1012357B
- Authority
- CN
- China
- Prior art keywords
- cyanide
- hcn
- decyanation
- cyanogen
- tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
The present invention relates to a method for recovering cyanide from industrial cyanide wastewater with low concentration. In the method, cyanide wastewater is circularly utilized so that cyanide is enriched; one part of cyanide wastewater is extracted by a pump; after being acidified by acid, the extracted cyanide wastewater removes cyanide through stripping; through condensation separation, moisture and foreign gas are removed from HCN mixed gas coming out through stripping; obtained liquid HCN, and alkali or acetone react to generate cyanide products. The method of the present invention can eliminate cyanide pollution on environment and can obtain cyanide products with high purity; the method of the present invention has the advantages of large water treatment quantity, obvious economic benefit and good environmental benefit.
Description
The present invention relates to a kind of method that from contain the cyanogen trade effluent, reclaims prussiate, be particularly useful for lower concentration and contain the cyanogen trade effluent, for example: ferromanganese blast furnace Coal-gas Washing Water Using and contain cyanogen ore dressing water.
At present, the method of handling industrial cyanide wastewater both at home and abroad is a lot, mainly contain pharmaceutical treatment and electrolytic process and atmospheric environment self-cleaning methods such as chlorinated lime, clorox, ozone, ferrous sulfate, sulfurous gas, these methods all are pure consumption-types, processing costs height not only, and in various degree secondary pollution is arranged.Have Shandong gold mine acidifying → air blast sudden and violent gas → NaOH similar with the present invention absorbs the production sodium cyanide method.This method working cost is higher, and processing cost and product income offsets substantially, simultaneously can not separating impurity gas, and product purity is unsecured.Also have coking final cold water to produce yellow prussiate of potash energy consumption height, the sales volume of the product is limited.
The purpose of this invention is to provide a kind of utilization and contain the high cyanide product of cyanogen trade effluent production purity, eliminate the method for prussiate environmental pollution simultaneously.
In order to achieve the above object, be subjected to the influence of pH value, promptly manyly under acidic conditions exist, manyly under alkaline condition exist with the salt state with the prussic acid molecularity according to the stability of prussiate in water, and the liquefying-point of prussic acid and CO
2, H
2The liquefying-point of gas such as S, HCl differs bigger characteristics, at first with the recycle under alkaline condition of lower concentration cyanide wastewater, make that prussiate is enriched to required concentration in the water, then, with pump extract out a part of water with acidifying and preheating after, pump advances the decyanation tower, with the direct stripping decyanation of steam, the mixed gas that the decyanation tower comes out goes out HCN liquid through condensation separation, absorbs with absorption agents such as alkali and produces cyanide product.
Technical process of the present invention is as shown in Figure 1: the lower concentration cyanide wastewater of industrial discharge with alkaline matter control PH more than 8, after advancing settling tank precipitation and removing suspended substance, recycle, treat that prussiate is enriched to finite concentration in the water, from circulating water pool, extract a part of water out with pump and regulate PH3-6 with acid to adding acid tank, the water yield of extracting out can be a principle at desirable value with the concentration that satisfies circulating water system cyanogen, water after the acidifying after interchanger heating with being pumped to the decyanation top of tower, in tower with the direct counter current contact decyanation of the steam of 2 kilograms of left and right sides pressure that enter at the bottom of the tower, waste water after the decyanation flows out from the tower bottom, flows back to circulating water pool after tower contains the heat exchange of cyanogen water at interchanger with advancing.The decyanation tower top temperature is controlled at 75-103 ℃, and HCN stripping in the waste water is gone out tower, and the mixed gas that comes out from the decyanation cat head is gone into tower through being cooled to 30-70 ℃ with most of steam condensing reflux.The high density HCN, the CO that come out from water cooler
2, H
2Mixed gass such as S enter condenser and are as cold as 0-20 ℃.Gas-liquid mixture is through separating CO
2, H
2Foreign gases such as S obtain liquid HCN.
When producing NaCN or KCN with present method, liquid HCN directly enters reactor and NaOH or KOH reaction generation NaCN or KCN.As producing acetone cyanohydrin, then HCN liquid enters the rectifying tower purification, reaches more than 99% for guaranteeing the HCN concentration that cat head comes out, and should control the rectifying tower top temperature is about 27 ℃.The HCN gas that rectifying tower top is come out is inflow reactor and acetone reaction generation acetone cyanohydrin after another condensation.
Carry out the sodium cyanide product purity that medium-sized test produces with above-mentioned technology and reach more than 90%, no sulphur, no ammonia are measured through the chemical plant and Electroplate Factory tries out, and satisfy the industrial chemicals requirement fully.One ton of waste water that contains cyanogen 400-600mg/l of every processing can reach the economical operation effect.
Claims (2)
1, a kind of method that from contain the cyanogen trade effluent, reclaims prussiate, it is characterized in that lower concentration contains the recycle under alkaline condition of cyanogen trade effluent, concentration of cyanide, the cyanogen trade effluent that contains after the enrichment is pumped into and adds acid tank, behind acid for adjusting pH value 3～6, enter the decyanation tower and contact the stripping decyanation with the steam counter-flow of 2kg pressure at the bottom of the tower, tower top temperature is controlled at 75～103 ℃; The HCN mixed gas that contains that comes out from the decyanation column overhead obtains liquid HCN through water cooler, condenser and gas-liquid separator, and liquid HCN enters reactor and alkali or acetone reaction again and obtains cyanide product.
2,, it is characterized in that the circulating sewage pH value under the described alkaline condition is controlled at more than 8 according to the said recovery prussiate of claim 1 method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107312 CN1012357B (en) | 1987-12-05 | 1987-12-05 | Method for recovery of cyanide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107312 CN1012357B (en) | 1987-12-05 | 1987-12-05 | Method for recovery of cyanide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035099A CN1035099A (en) | 1989-08-30 |
| CN1012357B true CN1012357B (en) | 1991-04-17 |
Family
ID=4816045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87107312 Expired CN1012357B (en) | 1987-12-05 | 1987-12-05 | Method for recovery of cyanide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012357B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105051002A (en) * | 2013-04-03 | 2015-11-11 | 陶氏环球技术有限责任公司 | Process for preparation of tertiary alkyl primary amines |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636616A (en) * | 2012-03-21 | 2012-08-15 | 云南昆钢煤焦化有限公司 | Method for testing content of hydrogen cyanide in gas |
| CN102701485A (en) * | 2012-06-19 | 2012-10-03 | 安徽朝山新材料股份有限公司 | Cyanide-containing wastewater treatment and recovery system |
| CN106335909A (en) * | 2016-10-20 | 2017-01-18 | 安庆市长虹化工有限公司 | Cyanide-containing wastewater recovery method and device |
| CN113045045A (en) * | 2021-03-26 | 2021-06-29 | 长春黄金研究院有限公司 | Complete device and method for treating acidified cyanide-containing wastewater by using atomized gas normal-temperature condensation method |
-
1987
- 1987-12-05 CN CN 87107312 patent/CN1012357B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105051002A (en) * | 2013-04-03 | 2015-11-11 | 陶氏环球技术有限责任公司 | Process for preparation of tertiary alkyl primary amines |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035099A (en) | 1989-08-30 |
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Legal Events
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |