CN102242269A - Method for selectively recovering lead from pregnant solution containing cyanides and heavy metals - Google Patents
Method for selectively recovering lead from pregnant solution containing cyanides and heavy metals Download PDFInfo
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- CN102242269A CN102242269A CN2011101820269A CN201110182026A CN102242269A CN 102242269 A CN102242269 A CN 102242269A CN 2011101820269 A CN2011101820269 A CN 2011101820269A CN 201110182026 A CN201110182026 A CN 201110182026A CN 102242269 A CN102242269 A CN 102242269A
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- liquid
- lead
- container
- pregnant solution
- solution containing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for selectively recovering lead from a pregnant solution containing cyanides and heavy metals. The method comprises the following steps: putting a cyaniding leaching pregnant solution containing high-concentration gold and silver, Pb<2+>, CNf, Pb(CN)4<2->, SCN<-1>, Cu<2+> and Cu(CN)<2-> in a container and then placing the container on a motor-driven stirrer for stirring; slowly adding H2O2 for oxidation reaction, wherein the oxidation reaction is severe, and reaction speed is fast; and after the oxidation reaction is finished, settling an oxidized reaction liquid in the container, wherein a precipitate is lead oxide. In the method, an environmentally-friendly oxidant H2O2 is used to carry out a redox reaction with Pb<2+> and Pb(CN)4<2->, thus more than 85% of lead in the pregnant solution can be recovered, and the precipitate PbO can be recycled. The method is environmentally-friendly and has economic benefits.
Description
Technical field
The present invention relates to a kind of method that from your liquid that contains metal ion, reclaims metal, particularly a kind of from your liquid that contains cyanogen and heavy metal the method for selective recovery lead, be applicable to the plumbiferous noble liquid cyanide of gold mine.
Background technology
Lead is the environmental pollutant wide, that the property accumulated is arranged that distribute.Plumbous stable in properties is to the very deleterious heavy metal element of human body, goes back serious harm children's health simultaneously.Along with industry and the developing rapidly of other industry, Lead contamination from occupational environment to water, atmosphere, food, medicine, and our daily life environment expand.So deleading has become urgent to topic that every field faces.
Plumbous pollution to environment, mainly by the industrial and mining enterprises that smelt, make and use leadwork, especially from the lead waste water of being discharged in the nonferrous metallurgical process, contain tens milligrams of lead concentrations in the waste water and whenever rise to the hundreds of milligram and do not wait for every liter, the lead in this waste water has higher recovery value.
The gold mine cyaniding leaches mainly contain Au (CN) in your liquid
2 -, Cu (CN)
3 2-And Pb (CN)
4 2-In complex compound, the ore characteristic difference, the content of heavy metal is also different.Your liquid cyaniding is leached in lead and is mainly derived from and contains lead ore and carry leaded activator that adds in gold (or other heavy metals) process etc.For example: zinc dust precipitation technology promptly is that your liquid (the leaching ore pulp that will contain molten gold send into wash concentration machine carry out countercurrent washing obtain Duoing 2 times of golden liquids with upper volume than leach liquor) is removed suspended substance and deoxidation through clarification, add plumbic acetate (activator) then, add zinc powder at last and replace, gold just can be deposited on the zinc powder surface.Your liquid that contains zinc powder filters through filter, promptly obtains gold mud.In replacement process, except the gold by the displacement, part lead also by replacement deposition on the zinc powder surface, if it is higher to contain lead concentration in your liquid, will directly influence the gold taste.
At present, domestic and international method at the solution deleading mainly contains:
1, the precipitator method.Precipitation agent mainly uses lime, caustic soda, soda ash etc.
2, coacervation.Utilize the cohesion of alum, ferrous sulfate and ferric sulfate also can deleading.
3, absorption method.Adopt natural zeolite, haydite and gac etc. as the lead in the expensive liquid of medium planar water both at home and abroad.
4, ion exchange method.The polystyrene-based ion-exchange fiber of hollow type can purify the toxicity lead ion.
But aforesaid method all exists the reagent consumption amount big, and cost is higher, and strict reaction conditions requirement is arranged, and subsequent disposal is problem such as difficulty comparatively.
Summary of the invention
The purpose of this invention is to provide a kind of both environmental protections, have the method for selective recovery lead from your liquid that contains cyanogen and heavy metal of economic benefit again.
Principle of work of the present invention:
Because it is your liquid cyaniding is leached and be strong basicity, wherein plumbous most of with Pb (CN)
4 2-And Pb
2+Form have Pb (CN)
4 2-And Pb
2+Chemical property is unstable, adds green oxidation agent H
2O
2, make H
2O
2With Pb (CN)
4 2-And Pb
2+Redox reaction takes place, generate orange red PbO material, solid-liquid separation effect is better, thereby reaches the neither taste of influence gold in the technology, can reclaim plumbous purpose again, is a kind of not only environmental protection but also economic novel method.
The present invention's method is: will contain high density, recovery value high gold and silver, and contain Pb simultaneously
2+, CN
f, Pb (CN)
4 2-, SCN
-, Cu
2+And Cu (CN)
2 -Cyaniding leach your liquid and be contained in to be placed on the electric mixer in the container and stir, slowly add H
2O
2, oxidizing reaction is comparatively violent, and speed of response is very fast, and oxidizing reaction is carried out sedimentation with oxidation liquid after finishing in container, and throw out is a plumbous oxide.
Reaction principle is as follows:
2H
2O
2+Pb
2++2OH
-→PbO↓+3H
2O+2O
2↑。
2H
2O
2+Pb(CN)
4 2-+2OH
-→PbO↓+3H
2O+O
2↑+4CN
-。
Described H
2O
2Be liquid analytical reagent or liquid industrial reagent or solid-state calcium peroxide or SPC-D and other solid-state pharmacy that in the aqueous solution, can discharge hydrogen peroxide.
Beneficial effect of the present invention
(1) adopts environmental type oxygenant H
2O
2With Pb
2+And Pb (CN)
4 2-Redox reaction takes place, and can reclaim the lead more than 85% in your liquid;
(2) oxidation time is shorter, only needs 15min, is convenient to industrial application;
(3) oxidation liquid settling velocity is very fast, and 30min gets final product sedimentation more than 90%, and is very favourable to industrial production;
(4) orange red PbO substances content is higher in the oxidation products, and the plumbous oxide purposes is more, is used as
Pigment lead In vain, make
Lead soap,
Metallurgical solubility promoter,
Paint drier,
PotteryRaw material,
Thiofide,
Desinsection Agent, the lead salt plastics
StablizerRaw material or the like has higher recovery value;
(5) H
2O
2With Pb
2+And Pb (CN)
4 2-Redox reaction product non-secondary pollution meets the requirement of cleaner production;
(6) H
2O
2With Pb (CN)
4 2-Take place in the process of redox reaction, not can with CN in your liquid
-, SCN
-, Cu
2+, Au
+And Ag
+Any reaction takes place, and does not influence technical process;
(7) H
2O
2The source is liquid analytical reagent, liquid industrial reagent, solid-state calcium peroxide, SPC-D and other solid-state pharmacy that can discharge hydrogen peroxide in the aqueous solution, and it is wider to originate;
(8) processing unit and flow process are comparatively simple, and be workable, less investment, profit height.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment:
Embodiment 1:
Cooperate shown in Figure 1ly, get leaded noble liquid cyanide and carry out proximate analysis, the results are shown in Table 1.
The leaded noble liquid cyanide proximate analysis of table 1 is table as a result
| Component | pH | CN f | SCN - | Cu 2+ | Pb 2+ | Au + |
| Content (mg/L) | ≥12 | 2290 | 8191 | 3830 | 91.9 | 1.48 |
Annotate: pH is a zero dimension
Get the expensive liquid of 1L in beaker, add 2mL H
2O
2, placing and stir 15min on the electric mixer, oxidizing reaction places the 1L graduated cylinder to carry out settling test oxidation liquid after finishing, and settling test the results are shown in Table 2.
Table 2 settling test is table as a result
| Settling time (min) | Rate of descent (%) |
| 10min | 50％ |
| 20min | 75％ |
| 30min | 93％ |
After treating that settling test finishes, supernatant liquor is analyzed each component content, and the supernatant liquor analytical results sees Table 3.
Table 3 supernatant liquor analytical results table
| Component | pH | CN f | SCN - | Cu 2+ | Pb 2+ | Au + |
| Content (mg/L) | ≥12 | 2290 | 8190 | 3825 | 13.03 | 1.47 |
The reaction precipitation thing is taken out, after the oven dry, carry out the assay lead content, by analysis, lead content is 73% in the throw out.
Supernatant liquor obtains Jin Heyin by zinc dust precipitation.
Embodiment 2:
Cooperate shown in Figure 1ly, get leaded noble liquid cyanide and carry out proximate analysis, the results are shown in Table 4.
The leaded noble liquid cyanide proximate analysis of table 4 is table as a result
| Component | pH | CN f | SCN - | Cu 2+ | Pb 2+ | Au + | Ag + |
| Content (mg/L) | ≥12 | 5750 | 2950 | 15000 | 333.8 | 295 | 112 |
Annotate: pH is a zero dimension
Get the expensive liquid of 1L in beaker, add 2mL H
2O
2, placing and stir 15min on the electric mixer, oxidizing reaction places the 1L graduated cylinder to carry out settling test oxidation liquid after finishing, and settling test the results are shown in Table 5.
Table 5 settling test is table as a result
| Settling time (min) | Rate of descent (%) |
| 10min | 48％ |
| 20min | 77％ |
| 30min | 92％ |
After treating that settling test finishes, supernatant liquor is analyzed each component content, and the supernatant liquor analytical results sees Table 6.
Table 6 supernatant liquor analytical results table
| Component | pH | CN f | SCN - | Cu 2+ | Pb 2+ | Au + | Ag + |
| Content (mg/L) | ≥12 | 5724 | 3000 | 14850 | 9.84 | 292 | 110 |
The reaction precipitation thing is taken out, after the oven dry, carry out the assay lead content, by analysis, lead content is 76% in the throw out.
Supernatant liquor obtains Jin Heyin by zinc dust precipitation.
Claims (3)
1. the method for a selective recovery lead from your liquid that contains cyanogen and heavy metal, this method is: will contain the high density gold and silver, and contain Pb simultaneously
2+, CN
f, Pb (CN)
4 2-, SCN
-, Cu
2+And Cu (CN)
2 -Cyaniding leach your liquid and be contained in to be placed on the electric mixer in the container and stir, slowly add H
2O
2, oxidizing reaction is comparatively violent, and speed of response is very fast, and oxidizing reaction is carried out sedimentation with oxidation liquid after finishing in container, and throw out is a plumbous oxide.
2. according to claim 1 a kind of from your liquid that contains cyanogen and heavy metal the method for selective recovery lead, it is characterized in that: described H
2O
2Add-on leach in your liquid for the 1L cyaniding and add 2mL H
2O
2
3. according to claim 1 and 2 a kind of from your liquid that contains cyanogen and heavy metal the method for selective recovery lead, it is characterized in that: described H
2O
2Be liquid analytical reagent or liquid industrial reagent or solid-state calcium peroxide or SPC-D or the solid-state pharmacy that in the aqueous solution, can discharge hydrogen peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101820269A CN102242269A (en) | 2011-06-30 | 2011-06-30 | Method for selectively recovering lead from pregnant solution containing cyanides and heavy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101820269A CN102242269A (en) | 2011-06-30 | 2011-06-30 | Method for selectively recovering lead from pregnant solution containing cyanides and heavy metals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102242269A true CN102242269A (en) | 2011-11-16 |
Family
ID=44960511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101820269A Pending CN102242269A (en) | 2011-06-30 | 2011-06-30 | Method for selectively recovering lead from pregnant solution containing cyanides and heavy metals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102242269A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105695764A (en) * | 2016-03-02 | 2016-06-22 | 中南大学 | Method for separating lead from lead-containing alkaline leaching liquor by oxidizing and precipitating |
| CN105806788A (en) * | 2014-12-30 | 2016-07-27 | 北京有色金属研究总院 | Rapid analysis method for concentration of cyanide in cyanide leaching solution of gold ore |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984002148A1 (en) * | 1982-12-02 | 1984-06-07 | Stuart Guy Clarke | Precious metal recovery |
| JPH06145828A (en) * | 1992-11-16 | 1994-05-27 | Mitsui Kinzoku Shigen Kaihatsu Kk | Method for recovering gold and silver |
| CN1144194A (en) * | 1996-06-14 | 1997-03-05 | 高大明 | Process for treatment of waste water containing cyanogen by acidifying precipitation method |
| CN1358669A (en) * | 2002-01-11 | 2002-07-17 | 清华大学 | Process for synthesizing alpha, beta type lead dioxide and leadleaden oxide naon crystal |
| CN1501530A (en) * | 2002-11-19 | 2004-06-02 | 比亚迪股份有限公司 | Lead dioxide coated carbon material, making method and zinc-nickel battery containing the same |
| CN101139660A (en) * | 2007-10-08 | 2008-03-12 | 郑满秀 | Method for extracting iron-lead and gold-silver from gold concentrate acidifying baking residue |
-
2011
- 2011-06-30 CN CN2011101820269A patent/CN102242269A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984002148A1 (en) * | 1982-12-02 | 1984-06-07 | Stuart Guy Clarke | Precious metal recovery |
| JPH06145828A (en) * | 1992-11-16 | 1994-05-27 | Mitsui Kinzoku Shigen Kaihatsu Kk | Method for recovering gold and silver |
| CN1144194A (en) * | 1996-06-14 | 1997-03-05 | 高大明 | Process for treatment of waste water containing cyanogen by acidifying precipitation method |
| CN1358669A (en) * | 2002-01-11 | 2002-07-17 | 清华大学 | Process for synthesizing alpha, beta type lead dioxide and leadleaden oxide naon crystal |
| CN1501530A (en) * | 2002-11-19 | 2004-06-02 | 比亚迪股份有限公司 | Lead dioxide coated carbon material, making method and zinc-nickel battery containing the same |
| CN101139660A (en) * | 2007-10-08 | 2008-03-12 | 郑满秀 | Method for extracting iron-lead and gold-silver from gold concentrate acidifying baking residue |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806788A (en) * | 2014-12-30 | 2016-07-27 | 北京有色金属研究总院 | Rapid analysis method for concentration of cyanide in cyanide leaching solution of gold ore |
| CN105695764A (en) * | 2016-03-02 | 2016-06-22 | 中南大学 | Method for separating lead from lead-containing alkaline leaching liquor by oxidizing and precipitating |
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Application publication date: 20111116 |