CN102701485A - Cyanide-containing wastewater treatment and recovery system - Google Patents
Cyanide-containing wastewater treatment and recovery system Download PDFInfo
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- CN102701485A CN102701485A CN2012102021978A CN201210202197A CN102701485A CN 102701485 A CN102701485 A CN 102701485A CN 2012102021978 A CN2012102021978 A CN 2012102021978A CN 201210202197 A CN201210202197 A CN 201210202197A CN 102701485 A CN102701485 A CN 102701485A
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Abstract
The invention discloses a cyanide-containing wastewater treatment and recovery system, which comprises alkaline leaching tanks (7), a leaching tank (8), a first sand pump (9), a first filter press (10), a first settling pond (11), a first liquid storage pond (12), a first water pump (13), a mixer (18) and an acidification tower (19) which are sequentially communicated. The mixer (18) is additionally communicated with a sulfuric acid tank (14) which is connected with the first liquid storage pond (12) in parallel. A sulfuric acid pump (15) is communicated between the sulfuric acid tank (14) and the mixer (18). The bottom of the acidification tower (19) is communicated with a second sand pump (20). The upper end of the acidification tower (19) is communicated with a neutralizing tank (22). A second filter press (21) is communicated between the second sand pump (20) and the neutralizing tank (22). The neutralizing tank (22) is communicated with a screw conveyer (23) through a second sand pump (24). The cyanide-containing wastewater treatment and recovery system has the advantages that the cyanide-containing wastewater can be cyclically used and the emission of heavy metals and cyanides can be reduced.
Description
Technical field
The present invention relates to the processing recovery system of sewage, relate in particular to the processing recovery system that is used for cyanogens-containing sewage water.
Background technology
Gold mine production technique in the past be raw ore through muck, ore grinding gravity treatment, flotation output concentrate, regrind the back cyaniding produce gold and silver.Aeration processing discharging in settling tank after the cyanogens-containing sewage water employing dioxygen water law oxide treatment that cyaniding production produces.But during sewage discharge wherein heavy metal, prussiate can not reach discharging standards, can not satisfy national heavy metal contamination control environmental management requirement, pollution on the environment also can threaten biological existence on every side.
Summary of the invention
The problem that the present invention will solve is that cyanogens-containing sewage water heavy metal, the prussiate of discharging in the existing gold mine production process exceed standard surrounding environment is damaged, and provides a kind of high cyanogens-containing sewage water of organic efficiency of handling to handle recovery system for this reason.
The technical scheme that the present invention adopts is: a kind of processing recovery system of cyanogens-containing sewage water; It comprises cyanogens-containing sewage water treatment system and the prussiate recovery system to reclaiming from cyanogens-containing sewage water treatment system ejecta; Said cyanogens-containing sewage water treatment system comprises alkali immersion trough, leaching vat, first sand pump, first pressure filter, first settling tank, first liquid storage tank, first water pump, mixing tank and the acidifying tower that is communicated with successively; Said mixing tank also is communicated with the sulphuric acid tank parallelly connected with first liquid storage tank; Be communicated with the sulfuric acid pump between said sulphuric acid tank and the mixing tank; Said prussiate recovery system comprises second sand pump that is communicated with the acidifying tower bottom and the neutralizing well that is communicated with acidifying tower upper end, is communicated with second pressure filter between second sand pump and the neutralizing well, and neutralizing well and worm conveyor are connected through second sand pump.
The improvement of this programme is to be connected with liquid meter between said first water pump and the mixing tank.
The further improvement of this programme is to be connected with the vitriolic acid flux meter between said sulfuric acid pump and the mixing tank.
The further improvement of this programme is that said worm conveyor is communicated with steel basin; Said steel basin top is communicated with the 3rd pressure filter; Said the 3rd pressure filter one end is communicated with the alkali immersion trough through the 3rd sand pump; The other end is communicated with second liquid storage tank through second water pump, and said second liquid storage tank is communicated with second settling tank.
The invention has the beneficial effects as follows through get into the cyanogens-containing sewage water and the sulfuric acid generation acidification reaction of acidifying tower by mixing tank; With metallic impurity ion (Cu+, Fe++, Zn++) and thiocyanate ion depositions such as (CNS-); While free cyanide and dissociated complex cyanide are HCN and stay in the solution; Throw out is squeezed into the pressure filter filter dehydration from the acidifying tower bottom, and solid matter is the recovery of filter cake state, goes up in the acidifying tower and asks in liquid and the inflow of pressure filter filtrating and steel basin and lime reaction; Make HCN convert Ca (CN) 2 into and return cyanide circuit usefulness again, the effect of play like this and recycle cyanogens-containing sewage water, reduce heavy metal, prussiate discharging.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
As shown in Figure 1; A kind of processing recovery system of cyanogens-containing sewage water; It comprises cyanogens-containing sewage water treatment system and the prussiate recovery system to reclaiming from cyanogens-containing sewage water treatment system ejecta; Said cyanogens-containing sewage water treatment system comprises successively the alkali immersion trough 7 that is communicated with, leaching vat 8, first sand pump 9, first pressure filter 10, first settling tank 11, first liquid storage tank 12, first water pump 13, mixing tank 18 and acidifying tower 19; Said mixing tank 18 also is communicated with the sulphuric acid tank 14 parallelly connected with first liquid storage tank 12; Be communicated with sulfuric acid pump 15 between said sulphuric acid tank 14 and the mixing tank 18; Said prussiate recovery system comprises between second sand pump 20 that is communicated with acidifying tower 19 bottoms and neutralizing well 22, the second sand pumps 20 that are communicated with acidifying tower 19 upper ends and the neutralizing well 22 and is communicated with second pressure filter 21 that neutralizing well 22 is connected through second sand pump 24 with worm conveyor 23.
The ore pulp of cyaniding is after the alkali preimpregnation; For satisfying the water balance of cyanidation system; Need to filter earlier the water yield with minimizing entering cyaniding, sizing mixing with the cyanogens-containing sewage water after handling gets into the cyanidation system leaching, and the filtrating that the slurry filtration after the leaching absorption obtains is through precipitating laggard cyanogens-containing sewage water treatment system.
Preference of the present invention is to be connected with liquid meter 17 between said first water pump 13 and the mixing tank 18; Be connected with vitriolic acid flux meter 16 between said sulfuric acid pump 15 and the mixing tank 18; Can detect acidifying sewage acidity at the mixer outlet place like this, make it meet technical requirements.The supernatant and second pressure filter filtrating flows into neutralizing well and lime reaction in the acidifying tower, makes HCN convert Ca (CN) 2 into and returns cyanide circuit and use.Neutralizer detects through basicity, makes it meet technical requirements.
Said worm conveyor 23 is communicated with steel basin 5; Said steel basin 5 is two-shipper steel basins; Its top is communicated with the 3rd pressure filter 4, and said the 3rd pressure filter 4 one ends are communicated with alkali immersion trough 7 through the 3rd sand pump 6, and the Ca (CN) 2 that transports from worm conveyor 23 continues next circulation; The other end is communicated with second liquid storage tank 2 through second water pump 3, and said second liquid storage tank 2 is communicated with second settling tank 1.Deliver to second liquid storage tank 2 and second settling tank 1 from other impurity that worm conveyor 23 transports through 4 processing of the 3rd pressure filter.
Acidification technique principle of the present invention is following:
(1) acidifying is resolved
In sewage, add sulfuric acid, make cyanating solution generation acidification reaction, the free cyanide in the cyanating solution and the metal complex of cyanogen parse HCN under acidic conditions, and metals ion and thiocyanate plasma are separated out.
2NaCN+H
2SO
4→Na
2SO
4+2HCN↑
2Na
2Cu(CN)
3+2H
2SO
4→Cu
2(CN)
2+2Na
2SO
4+4HCN↑
Cu
2(CN)
2+2NaCNS→Cu
2(CNS)
2↓+2NaCN
Na
2Zn(CN)
?4+?2H
2SO
4→Na
2SO
4+?ZnSO
4+4HCN↑
Na
4?Fe(CN)
?6+?2H
2SO
4→H
4[Fe(CN)
?6]↓+2Na
2SO
4
(2) acidifying sewage neutralization
Sewage after the acidifying is acid (PH=2), and throw out is through filtering, and filtrating neutralizes with lime.Reaction in the N-process mainly contains:
H
2SO
4+Ca(OH)
2→CaSO
4↓+2H
2O
2HCN+Ca(OH)
2→Ca(CN)
2+2H
2O
HCN in the sewage and lime reaction generate Ca (CN)
2, alternative NaCN returns in the cyanidation system and utilizes once more.
(3) acidizing fluid filters
The sewage acidifying is in the acidifying tower of sealing, to carry out, and squeezes into the diaphragm filter press with pump at the bottom of the tower behind the harmful metal impurity acid precipitation in the cyanogens-containing sewage water and dewaters, and the precipitated metal thing is filter cake shape as by-product sale.
Claims (4)
1. the processing recovery system of a cyanogens-containing sewage water; It is characterized in that it comprises cyanogens-containing sewage water treatment system and the prussiate recovery system to reclaiming from cyanogens-containing sewage water treatment system ejecta; Said cyanogens-containing sewage water treatment system comprises alkali immersion trough (7), leaching vat (8), first sand pump (9), first pressure filter (10), first settling tank (11), first liquid storage tank (12), first water pump (13), mixing tank (18) and the acidifying tower (19) that is communicated with successively; Said mixing tank (18) also is communicated with the sulphuric acid tank (14) parallelly connected with first liquid storage tank (12); Be communicated with sulfuric acid pump (15) between said sulphuric acid tank (14) and the mixing tank (18); Said prussiate recovery system comprises second sand pump (20) that is communicated with acidifying tower (19) bottom and the neutralizing well (22) that is communicated with acidifying tower (19) upper end; Be communicated with second pressure filter (21) between second sand pump (20) and the neutralizing well (22), neutralizing well (22) and worm conveyor (23) are connected through second sand pump (24).
2. the processing recovery system of a kind of cyanogens-containing sewage water as claimed in claim 1 is characterized in that being connected with liquid meter (17) between said first water pump (13) and the mixing tank (18).
3. the processing recovery system of a kind of cyanogens-containing sewage water as claimed in claim 2 is characterized in that being connected with vitriolic acid flux meter (16) between said sulfuric acid pump (15) and the mixing tank (18).
4. the processing recovery system of a kind of cyanogens-containing sewage water as claimed in claim 1; It is characterized in that said worm conveyor (23) is communicated with steel basin (5); Said steel basin (5) top is communicated with the 3rd pressure filter (4); Said the 3rd pressure filter (4) one ends are communicated with alkali immersion trough (7) through the 3rd sand pump (6), and the other end is communicated with second liquid storage tank (2) through second water pump (3), and said second liquid storage tank (2) is communicated with second settling tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102021978A CN102701485A (en) | 2012-06-19 | 2012-06-19 | Cyanide-containing wastewater treatment and recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102021978A CN102701485A (en) | 2012-06-19 | 2012-06-19 | Cyanide-containing wastewater treatment and recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102701485A true CN102701485A (en) | 2012-10-03 |
Family
ID=46894625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102021978A Pending CN102701485A (en) | 2012-06-19 | 2012-06-19 | Cyanide-containing wastewater treatment and recovery system |
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| Country | Link |
|---|---|
| CN (1) | CN102701485A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288247A (en) * | 2013-07-01 | 2013-09-11 | 山东黄金矿业(莱州)有限公司精炼厂 | Process for realizing wastewater zero discharge in gold production process |
| CN106517592A (en) * | 2016-12-15 | 2017-03-22 | 北京矿冶研究总院 | Method for impurity removal treatment of cyanide-containing wastewater |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035099A (en) * | 1987-12-05 | 1989-08-30 | 新余钢铁厂 | Reclaim the method for prussiate |
| US5364605A (en) * | 1991-06-05 | 1994-11-15 | Fmc Corporation | Recovery of cyanide from precious metal tailings |
| CN1144194A (en) * | 1996-06-14 | 1997-03-05 | 高大明 | Process for treatment of waste water containing cyanogen by acidifying precipitation method |
| CN1250031A (en) * | 1999-09-14 | 2000-04-12 | 龙口市黄金矿冶公司 | Lean cyanided ore liquid impurity eliminating technology |
-
2012
- 2012-06-19 CN CN2012102021978A patent/CN102701485A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035099A (en) * | 1987-12-05 | 1989-08-30 | 新余钢铁厂 | Reclaim the method for prussiate |
| US5364605A (en) * | 1991-06-05 | 1994-11-15 | Fmc Corporation | Recovery of cyanide from precious metal tailings |
| CN1144194A (en) * | 1996-06-14 | 1997-03-05 | 高大明 | Process for treatment of waste water containing cyanogen by acidifying precipitation method |
| CN1250031A (en) * | 1999-09-14 | 2000-04-12 | 龙口市黄金矿冶公司 | Lean cyanided ore liquid impurity eliminating technology |
Non-Patent Citations (1)
| Title |
|---|
| 杜淑芬等: "三步沉淀法处理含氰贫液全循环工艺的应用", 《黄金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288247A (en) * | 2013-07-01 | 2013-09-11 | 山东黄金矿业(莱州)有限公司精炼厂 | Process for realizing wastewater zero discharge in gold production process |
| CN106517592A (en) * | 2016-12-15 | 2017-03-22 | 北京矿冶研究总院 | Method for impurity removal treatment of cyanide-containing wastewater |
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Application publication date: 20121003 |