CN105441691A - Method for extracting precious metals from low-grade gold (Au)-palladium (Pd)-platinum (Pt) materials - Google Patents
Method for extracting precious metals from low-grade gold (Au)-palladium (Pd)-platinum (Pt) materials Download PDFInfo
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- CN105441691A CN105441691A CN201510797565.1A CN201510797565A CN105441691A CN 105441691 A CN105441691 A CN 105441691A CN 201510797565 A CN201510797565 A CN 201510797565A CN 105441691 A CN105441691 A CN 105441691A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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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
Abstract
The invention provides a method for extracting precious metals from low-grade gold (Au)-palladium (Pd)-platinum (Pt) materials. The method comprises the steps that after the low-grade Au-Pd-Pt materials containing the precious metals are subjected to chloridizing roasting and hydrochloric acid leaching to generate a solution, the acidity and electric potential of the solution are regulated; and Au is extracted through DBC, Pd is extracted through S201, Pt is extracted through N235, and thus Au, Pd and Pt are separated. By means of the method, operation is convenient, all the procedures are linked reasonably, and the production period is short; the technological process is simple, the direct recovery rates of the precious metals are high, and dispersion of the precious metals can be prevented to the maximum extent; the direct recovery rate of Au is higher than or equal to 95.00%, the direct recovery rate of Pd is higher than or equal to 95.00%, and the direct recovery rate of Pt is higher than or equal to 94.50%.
Description
Technical field
The invention belongs to metal separation purification techniques field, be specifically related to a kind of method extracting precious metal from low-grade gold palladium platinum material.
Background technology
In traditional precious metal refinery process, can produce a large amount of low grade noble metal materials (as aqueous noble metal solution chlorination insoluble slag, petrochemical industry hydrogenation catalyst etc.), these materials have complicated component, and base metal content is high, bullion content is low, and precious metal extracts the features such as difficulty is large.If these materials are incorporated in traditional refinery practice and extract precious metal, the waste of reagent and the energy can be caused, and the further dispersion of precious metal can be caused, cause the loss of precious metal.
Summary of the invention
For the defect of prior art, the invention provides a kind of method extracting precious metal from low-grade gold palladium platinum material.
The technical scheme of employing of the present invention is: a kind of method extracting precious metal from low-grade gold palladium platinum material, comprises the steps:
Step a, low-grade gold palladium platinum material is added CaCl
2, at 900 ~ 1350 DEG C, carry out chloridizing roasting, low-grade gold palladium platinum material and CaCl2 mass ratio are 1 ~ 3:1, Cl2 flow is 10 ~ 15L/h;
Step b, the chloridizing roasting slag 1mol/L Leaching in Hydrochloric Acid will obtained in step a, solid-liquid mass ratio is 1:4 ~ 5, and extraction temperature is 80 ~ 90 DEG C, and extraction time is 4 ~ 6h, and after leaching, slag is not paid outward;
Step c, the leach liquor obtained by step b are 850 ~ 950mv through concentrated, adjustment current potential, and be 1.5 ~ 3mol/L by the concentrated leach liquor acidity of concentrated hydrochloric acid adjustment, the solution after adjustment acidity is through organic solvent DBC extracting gold;
Steps d, palladium concentration in liquid more than the extraction gold in step c is adjusted to 1.5 ~ 3.5g/L, controlling potential is 850 ~ 950mv, and the remaining liquid of extraction gold is through S201 extracting and separating palladium;
Step e, platinum concentration in liquid more than the extraction palladium in steps d is adjusted to 5 ~ 9g/L, acidity is after 0.5 ~ 2.5mol/L, through N235 extracting and separating platinum;
Further, in described step a chloridizing roasting process, precious metal chlorination efficiency is respectively Au >=99.00%, Pd >=99.50%, Pt >=99.50%.
Further, in described step b Leaching in Hydrochloric Acid process, precious metal leaching yield is respectively Au >=98.00%, Pd >=97.00%, Pt >=97.00%.
Principle of the present invention utilizes chlorinating roasting at a certain temperature the chlorine that the precious metal chlorination in material becomes precious metal to be joined thing, then utilize certain density hydrochloric acid precious metal chlorine to be joined thing leach and pass in and out in solution the enrichment and liquid making that realize precious metal, and then adjust acidity, the concentration of precious metal in solution, the extraction stages of various precious metal is entered after adjustment, utilize DBC, S201, N235 etc. are to the good effect of extracting of precious metal, achieve the separation of precious metal, after separation, precious metal is through refining procedure, output meets the noble metal products of national standard.
Beneficial effect of the present invention is:
1, scatter coefficient≤1% of precious metal in chlorination process can be made;
2, after Leaching in Hydrochloric Acid, the gold, palladium, the platinum that are greater than 95.00% is had to enter in solution;
3, gold makes, the potassium cloride efficiency of palladium, platinum is high, can prevent the dispersion of precious metal to greatest extent, improve the direct yield of gold, palladium, platinum, Au >=95.00%, Pd >=95.00%, Pt >=94.50%.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in more detail.
Embodiment 1
Aqueous noble metal solution chlorination insoluble slag 100kg admixes CaCl by 1:1
2, chloridizing roasting temperature is 900 DEG C, carries out chloridizing roasting, start logical Cl when temperature rises to 200 DEG C according to setting heating schedule
210L/h, the furnace temperature such as chlorination is complete are down to less than 200 DEG C and are closed Cl
2, the heavy 186.7kg of chloridizing roasting slag after completion of the reaction, with 750L1mol/L Leaching in Hydrochloric Acid chloridizing roasting slag, extraction temperature is 80 DEG C, and extraction time is 4h, secondary filter after leaching, the heavy 89.5kg of filter residue, and liquor capacity is 720L; Solution concentrates volume to 100L, and adjustment acidity is 2.6mol/L, and controlling potential is 910mv, and solution is through organic solvent DBC extracting and separating gold; The remaining liquid of extraction gold dilutes 5 times of i.e. 500L, and Controlled acidity is 1.6mol/L, and now solution potential is 620mv, and solution, in upper heating, leads to Cl
2chlorination, concentrates after chlorination and catches up with Cl
2, adjustment acidity is 2.4mol/L, and controlling potential is 890mv, and now liquor capacity is 200L, and solution is through organic solvent S201 extracting and separating palladium, and more than extraction palladium, liquid is through organic solvent N235 extracting and separating platinum; Whole process precious metal direct yield is Au=96.4%, Pd=97.2%.Pt=94.7%。
Embodiment 2: petrochemical industry hydrogenation catalyst (not containing gold) 150kg admixes CaCl by 3:1
2, carry out chloridizing roasting according to setting heating schedule, chloridizing roasting temperature is 1350 DEG C, starts logical Cl when temperature rises to 220 DEG C
215L/h, the furnace temperature such as chlorination is complete are down to less than 150 DEG C and are closed Cl
2, the heavy 215.4kg of chloridizing roasting slag after completion of the reaction; With 870L1mol/L Leaching in Hydrochloric Acid 6h, extraction temperature is 90 DEG C, secondary filter after leaching, the heavy 103.7kg of filter residue, and filtrate volume is 830L; Filtrate concentrates volume to 100L, and Controlled acidity is 1.7mol/L, and controlling potential is 880mv, solution is through organic solvent S201 extracting and separating palladium, more than adjustment extraction palladium, in liquid, platinum content is 2.6g/L, and acidity is after 0.7mol/L, and solution is through organic solvent N235 extracting and separating platinum; Whole process precious metal direct yield is Au=95.8%, Pd=96.1%, Pt=95.1%.
Claims (3)
1. from low-grade gold palladium platinum material, extract a method for precious metal, it is characterized in that: comprise the steps:
Step a, low-grade gold palladium platinum material is added CaCl
2, at 900 ~ 1350 DEG C, carry out chloridizing roasting, low-grade gold palladium platinum material and CaCl2 mass ratio are 1 ~ 3:1, Cl2 flow is 10 ~ 15L/h;
Step b, the chloridizing roasting slag 1mol/L Leaching in Hydrochloric Acid will obtained in step a, solid-liquid mass ratio is 1:4 ~ 5, and extraction temperature is 80 ~ 90 DEG C, and extraction time is 4 ~ 6h, and after leaching, slag is not paid outward;
Step c, the leach liquor obtained by step b are 850 ~ 950mv through concentrated, adjustment current potential, and be 1.5 ~ 3mol/L by the concentrated leach liquor acidity of concentrated hydrochloric acid adjustment, the solution after adjustment acidity is through organic solvent DBC extracting gold;
Steps d, palladium concentration in liquid more than the extraction gold in step c is adjusted to 1.5 ~ 3.5g/L, controlling potential is 850 ~ 950mv, and the remaining liquid of extraction gold is through S201 extracting and separating palladium;
Step e, platinum concentration in liquid more than the extraction palladium in steps d is adjusted to 5 ~ 9g/L, acidity is after 0.5 ~ 2.5mol/L, through N235 extracting and separating platinum.
2. a kind of method extracting precious metal from low-grade gold palladium platinum material according to claim 1, is characterized in that: in described step a chloridizing roasting process, precious metal chlorination efficiency is respectively Au >=99.00%, Pd >=99.50%, Pt >=99.50%.
3. a kind of method extracting precious metal from low-grade gold palladium platinum material according to claim 1, is characterized in that: in described step b Leaching in Hydrochloric Acid process, precious metal leaching yield is respectively Au >=98.00%, Pd >=97.00%, Pt >=97.00%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510797565.1A CN105441691A (en) | 2015-11-18 | 2015-11-18 | Method for extracting precious metals from low-grade gold (Au)-palladium (Pd)-platinum (Pt) materials |
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| CN201510797565.1A CN105441691A (en) | 2015-11-18 | 2015-11-18 | Method for extracting precious metals from low-grade gold (Au)-palladium (Pd)-platinum (Pt) materials |
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| CN201510797565.1A Pending CN105441691A (en) | 2015-11-18 | 2015-11-18 | Method for extracting precious metals from low-grade gold (Au)-palladium (Pd)-platinum (Pt) materials |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165743A (en) * | 2017-12-28 | 2018-06-15 | 郴州雄风环保科技有限公司 | A kind of full extraction and separation prepare high-purity Au, Pt, Pd technology |
| CN110694300A (en) * | 2019-10-23 | 2020-01-17 | 金川集团股份有限公司 | Platinum-palladium efficient extraction and separation system and extraction and separation method thereof |
| CN110760684A (en) * | 2019-12-04 | 2020-02-07 | 沈阳有色金属研究院有限公司 | Method for recovering platinum from platinum-containing organic matter |
| CN113151681A (en) * | 2021-02-19 | 2021-07-23 | 石家庄绿色再生资源有限公司 | Process for recovering noble metal palladium from waste palladium catalyst |
| CN114774695A (en) * | 2022-03-07 | 2022-07-22 | 金川集团股份有限公司 | Method for extracting precious metals from silver anode mud pickle liquor |
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2015
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165743A (en) * | 2017-12-28 | 2018-06-15 | 郴州雄风环保科技有限公司 | A kind of full extraction and separation prepare high-purity Au, Pt, Pd technology |
| CN110694300A (en) * | 2019-10-23 | 2020-01-17 | 金川集团股份有限公司 | Platinum-palladium efficient extraction and separation system and extraction and separation method thereof |
| CN110694300B (en) * | 2019-10-23 | 2021-08-27 | 金川集团股份有限公司 | Platinum-palladium efficient extraction and separation system and extraction and separation method thereof |
| CN110760684A (en) * | 2019-12-04 | 2020-02-07 | 沈阳有色金属研究院有限公司 | Method for recovering platinum from platinum-containing organic matter |
| CN113151681A (en) * | 2021-02-19 | 2021-07-23 | 石家庄绿色再生资源有限公司 | Process for recovering noble metal palladium from waste palladium catalyst |
| CN113151681B (en) * | 2021-02-19 | 2022-07-12 | 石家庄绿色再生资源有限公司 | Process for recovering noble metal palladium from waste palladium catalyst |
| CN114774695A (en) * | 2022-03-07 | 2022-07-22 | 金川集团股份有限公司 | Method for extracting precious metals from silver anode mud pickle liquor |
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