CN113802012A - Method for separating gold from thiosulfate gold leaching solution - Google Patents

Method for separating gold from thiosulfate gold leaching solution Download PDF

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CN113802012A
CN113802012A CN202111046550.3A CN202111046550A CN113802012A CN 113802012 A CN113802012 A CN 113802012A CN 202111046550 A CN202111046550 A CN 202111046550A CN 113802012 A CN113802012 A CN 113802012A
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gold
thiosulfate
extraction
leaching solution
organic phase
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胡显智
李鑫容
字富庭
赵莉
陈树梁
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Kunming University of Science and Technology
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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
    • 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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Abstract

本发明公开一种分离硫代硫酸盐浸金液中金的方法，属于贵金属回收领域。本发明所述方法包括配置硫代硫酸盐浸金液和含萃取组分有机相，使所述浸金液与定量的所述萃取剂进行萃取分离；萃取剂为二苯基膦及其衍生物，其结构简单，易于获得，且该萃取剂对硫代硫酸盐浸金液中的金具有很好的萃取分离效果；本发明提供的萃取分离方法不受硫代硫酸盐浸金液pH的影响，且该方法工艺简单、耗时短。

Figure 202111046550

The invention discloses a method for separating gold in a thiosulfate leaching gold solution, and belongs to the field of precious metal recovery. The method of the invention comprises configuring a thiosulfate gold leaching solution and an organic phase containing extraction components, so that the gold leaching solution and a quantitative extractant are extracted and separated; the extractant is diphenylphosphine and its derivatives , its structure is simple, easy to obtain, and the extraction agent has a good extraction and separation effect on gold in the thiosulfate gold leaching solution; the extraction and separation method provided by the present invention is not affected by the pH of the thiosulfate gold leaching solution , and the method is simple and time-consuming.

Figure 202111046550

Description

Method for separating gold from thiosulfate gold leaching solution
Technical Field
The invention belongs to the field of precious metal recovery, and particularly relates to a method for separating gold from thiosulfate gold leaching solution.
Background
Gold as a noble metal has unique physical properties, and is not only an important material in the departments of jewelry industry, electronic industry, modern communication, aerospace industry and the like, but also a special currency for storage and investment. However, the average content of gold in the crust is only 1.1 parts per billion, and the pure gold in nature is very little, and is often associated with elements such as sulfur, iron, copper and the like in minerals, so that the extraction method of gold is particularly difficult. At present, the main gold extraction method is the cyanidation method, but because cyanide is a highly toxic substance and the cyanidation method can generate a large amount of cyanide-containing waste and waste liquid to cause environmental pollution, the cyanidation method is strictly controlled or prohibited by some countries. The thiosulfate gold leaching method is a non-cyanide gold extraction technology which is most likely to replace a cyanidation method due to the characteristics of no toxicity, environmental protection and high efficiency, and capability of treating carbonaceous gold ores, sulfur-containing gold ores or copper gold ores which cannot be treated by the cyanidation method.
Solvent extraction is used as a gold separation method, and the method has the advantages of simple process, easy operation and good separation effect; aiming at the separation and extraction of Au (I) in a thiosulfate gold leaching system, a solvent extraction system is usually constructed by amine or quaternary ammonium salt and other substances; although these extraction systems have a certain extraction effect on gold in a thiosulfate gold leaching method, the extraction systems also have the problems of poor stability, large influence of pH, limited types of extractants and the like.
Disclosure of Invention
The invention aims to solve the problems of gold extraction and separation in a thiosulfate gold leaching system, and provides a method for separating gold from thiosulfate gold leaching solution, wherein the whole extraction process is simple and easy to operate, and has large extraction flux, and the method specifically comprises the following steps:
(1) dissolving diphenylphosphine and its derivatives in organic solvent to form organic phase.
(2) Leaching gold ore by a thiosulfate method to extract gold, and taking the leaching liquid as a water phase; the organic and aqueous phases were mixed and Au (I) was extracted into the organic phase.
Preferably, the organic phase in step (1) of the present invention is toluene, and the concentration of diphenylphosphine and its derivatives is 5-8 mmol/L.
Preferably, the extraction temperature in the step (2) is 10-55 ℃, and the extraction time is 10 min.
Preferably, the volume ratio of the organic phase to the aqueous phase in the step (2) of the present invention is 1 (2-10).
The structural formula of the extracting agent diphenylphosphine and the derivatives thereof is as follows:
Figure DEST_PATH_IMAGE002
wherein R is a substituent.
The phosphorus atom of the diphenyl phosphine provides a lone pair of electrons to the gold (I) with an empty orbit, and a coordination bond is formed between the phosphorus atom and the gold (I), so that the chlorodiphenyl phosphine can form a complex with the gold (I) in the solution, and the gold (I) is extracted from the solution.
The invention has the beneficial effects that:
(1) the invention provides a novel extracting agent diphenylphosphine and a derivative thereof, wherein the extracting agent can well extract Au (I) in a thiosulfate gold leaching system.
(2) The extraction separation method provided by the invention is less influenced by the pH value of the water phase, and has better adsorption effect within the range that the pH value is more than or equal to 6.
(3) The invention has simple and easy operation, high extraction rate and good effect, and can realize the quick extraction and recovery of the cash only needing 10 min.
Drawings
FIG. 1 is a flow diagram of the extraction process of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto
Not limited to the contents.
Example 1
(1) The diphenylphosphine is dissolved in toluene to form an organic phase, and the concentration of the extracting agent is 5 mmol/L.
(2) In this example, a leaching solution of gold ore is used as an aqueous phase, and the leaching solution contains Au (S)2O3)2 3-Concentration of 20.5 mg/L, Cu2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80 mmol/L, S2O3 2-The concentration is 0.1 mol/L; the aqueous phase was adjusted to pH 6.
(3) Mixing 10mL of organic phase and 20mL of aqueous phase, extracting for 10min at 15 ℃, shaking in the extraction process to ensure that the aqueous phase and the organic phase are fully contacted, and calculating the gold extraction rate to be 98 percent after the extraction is finished.
Example 2
(1) The diphenylphosphine is dissolved in toluene to form an organic phase, and the concentration of the extracting agent is 6 mmol/L.
(2) In this example, a leaching solution of gold ore is used as an aqueous phase, and the leaching solution contains Au (S)2O3)2 3-At a concentration of
12.3 mg/L，Cu2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80 mmol/L, S2O3 2-The concentration is 0.1 mol/L; the aqueous phase was adjusted to pH 7.
(3) Mixing 10mL of organic phase and 40mL of water phase, extracting for 10min at 25 ℃, shaking in the extraction process to ensure that the water phase and the organic phase are fully contacted, and calculating the gold extraction rate to be 96% after the extraction is finished.
Example 3
(1) The diphenylphosphine was dissolved in toluene to form an organic phase, and the concentration of the extractant was 7 mmol/L.
(2) In this example, a leaching solution of gold ore is used as an aqueous phase, and the leaching solution contains Au (S)2O3)2 3-Concentration of 20.5 mg/L, Cu2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80 mmol/L, S2O3 2-The concentration is 0.1 mol/L; the aqueous phase was adjusted to pH 8.
(3) Mixing 10mL of organic phase and 20mL of aqueous phase, extracting for 10min at 35 ℃, shaking in the extraction process to ensure that the aqueous phase and the organic phase are fully contacted, and calculating the gold extraction rate to be 98 percent after the extraction is finished.
Example 4
(1) The diphenylphosphine is dissolved in toluene to form an organic phase, and the concentration of the extracting agent is 8 mmol/L.
(2) In this example, a leaching solution of gold ore is used as an aqueous phase, and the leaching solution contains Au (S)2O3)2 3-The concentration is 50.6 mg/L, Cu2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80 mmol/L, S2O3 2-Concentration ofIs 0.1 mol/L; the aqueous phase was adjusted to pH 9.
(3) Mixing 10mL of organic phase and 20mL of aqueous phase, extracting for 10min at 45 ℃, shaking in the extraction process to ensure that the aqueous phase and the organic phase are fully contacted, and calculating the gold extraction rate to be 86 percent after the extraction is finished.
Example 5
(1) The diphenylphosphine is dissolved in toluene to form an organic phase, and the concentration of the extracting agent is 8 mmol/L.
(2) Configuration of 80mg/L Au (S)2O3)2 3-The simulated solution was an aqueous phase, which was adjusted to pH 11.
(3) Mixing 10mL of organic phase and 30mL of aqueous phase, extracting for 10min at 25 ℃, shaking in the extraction process to ensure that the aqueous phase and the organic phase are fully contacted, and calculating the gold extraction rate to be 99 percent after the extraction is finished.
Example 6
(1) The chlorodiphenylphosphine is dissolved in toluene to form an organic phase, and the concentration of the extracting agent is 8 mmol/L.
(2) In this example, a leaching solution of gold ore is used as an aqueous phase, and the leaching solution contains Au (S)2O3)2 3-The concentration is 50.6 mg/L, Cu2+The concentration is 5mmol/L, NH3/NH4 +The concentration is 80 mmol/L, S2O3 2-The concentration is 0.1 mol/L; the aqueous phase was adjusted to pH 9.
(3) Mixing 10mL of organic phase and 20mL of aqueous phase, extracting for 10min at 45 ℃, shaking in the extraction process to ensure that the aqueous phase and the organic phase are fully contacted, and calculating the gold extraction rate to be 81 percent after the extraction is finished.
While the present invention has been described in detail with reference to the specific embodiments thereof, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (4)

1.一种分离硫代硫酸盐浸金液中金的方法，其特征在于，具体包括以下步骤：1. a method for separating gold in thiosulfate leaching gold liquid, is characterized in that, specifically comprises the following steps: （1）将二苯基膦及其衍生物溶解于有机溶剂中构成有机相；(1) Dissolving diphenylphosphine and its derivatives in an organic solvent to form an organic phase; （2）用硫代硫酸盐法对金矿石进行浸出提金，以其浸出液为水相；将有机相和水相混匀，使Au（Ⅰ）被萃取至有机相。(2) The gold ore is leached and extracted by the thiosulfate method, and the leaching solution is used as the water phase; the organic phase and the water phase are mixed evenly, so that Au(I) is extracted into the organic phase. 2.根据权利要求1所述分离硫代硫酸盐浸金液中金的方法，其特征在于：所述步骤（1）有机相为甲苯，二苯基膦及其衍生物浓度为5-8mmol/L。2. The method for separating gold in thiosulfate leaching solution according to claim 1, wherein the organic phase of the step (1) is toluene, and the concentration of diphenylphosphine and its derivatives is 5-8mmol/ L. 3.根据权利要求1所述分离硫代硫酸盐浸金液中金的方法，其特征在于：所述步骤（2）萃取温度为10-55℃，萃取时间为10min。3. The method for separating gold in a thiosulfate gold leaching solution according to claim 1, wherein the extraction temperature in the step (2) is 10-55°C, and the extraction time is 10 min. 4.根据权利要求1所述分离硫代硫酸盐浸金液中金的方法，其特征在于：所述步骤（2）有机相与水相的体积比为1:(2-10)。4. the method for separating gold in thiosulfate leaching gold liquid according to claim 1, is characterized in that: the volume ratio of described step (2) organic phase and water phase is 1:(2-10).
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115232964A (en) * 2022-08-15 2022-10-25 云南大学 Extraction method of gold in alkaline solution containing gold thiosulfate complex based on natural deep eutectic solvent

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CN101824545A (en) * 2010-02-10 2010-09-08 昆明理工大学 Method for extracting gold from thiosulfate adopting ethanediamine as additive
CN108546827A (en) * 2018-05-14 2018-09-18 中南大学 A method of soaking gold using ferrous ion, magnesium thiosulfate
CN110042235A (en) * 2019-04-29 2019-07-23 山东大学 A kind of extractant and extracting process of separation gold
CN112267030A (en) * 2020-11-02 2021-01-26 昆明理工大学 Method for directly recovering gold in thiosulfate system by using active carbon

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115232964A (en) * 2022-08-15 2022-10-25 云南大学 Extraction method of gold in alkaline solution containing gold thiosulfate complex based on natural deep eutectic solvent

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