CN1153850C - Process for preparing high-purity gold by electrolyzing extracted gold-contained organic phase - Google Patents
Process for preparing high-purity gold by electrolyzing extracted gold-contained organic phase Download PDFInfo
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- CN1153850C CN1153850C CNB011418990A CN01141899A CN1153850C CN 1153850 C CN1153850 C CN 1153850C CN B011418990 A CNB011418990 A CN B011418990A CN 01141899 A CN01141899 A CN 01141899A CN 1153850 C CN1153850 C CN 1153850C
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Abstract
The present invention relates to a method for preparing high purity gold by electrolyzing extracted gold-contained organic phases. More specifically, an electrolyte which is composed of two phases of a gold-contained organic phase and a water solution containing a water solution is electrolyzed. Thus, the high purity gold is prepared, and the common deposit and purification procedures, such as back extraction, reduction, etc., are saved. The quality and the recovery rate of the obtained gold are enhanced by the present invention, and the production cost is reduced. The present invention provides theory and practice foundations for improving or simplifying technology industrialization for extracting gold in a cyanide method and an extraction method. The gold deposition efficiency prepared according to the present invention is greater than 95%, the gold purity is greater than 95%, and the production cost can be greatly reduced. The method for preparing high purity gold is widely applied to the technical field of preparing high purity gold.
Description
The technical field is as follows: the invention relates to a method for producing high-purity gold, in particular gold from electrolysis of gold (e.g. Au (CN))2 -) A method for preparing pure gold by using an organic phase.
Background art: the cyanidation method is still the main position in the process of extracting gold from gold ore, and the post-treatment of cyanidation leaching liquid mainly adoptsan activated carbon adsorption method (carbon pulp or carbon leaching method) and a zinc replacement method. For the activated carbon adsorption method, the activated carbon has poor selectivity and long process flow, and the regeneration of the activated carbon needs energy consumption. The gold cyanide mud obtained by the zinc replacement method has high impurity content and low gold quality, and usually needs refining processes such as acid treatment and the like.
The extraction method is a method commonly used in hydrometallurgy, has the advantages of high selectivity, rapidness, environmental protection and the like, and is widely applied to the production of transition metals, rare earth, uranium and the like. For the extraction of gold, there are patents reported, such as the extraction of gold from alkaline cyanide (CN 1186123), and the extraction rate is more than 96%, which is a very effective method for extracting goldA method. However, when quaternary ammonium salts are used as extractants, gold in the aqueous phase is extracted (e.g., Au (CN))- 2) Then, the following reaction takes place:
since R is in the resulting extraction complex4N+And Au (CN)- 2The combination is tight, the back extraction is difficult, although a plurality of back extraction agents can be used for the back extraction, the back extraction efficiency is lower, and the practical result can be achieved only by carrying out multi-stage back extraction; after the back extraction, Au (I) or Au (III) in the aqueous phase needs to be further reduced to gold elementary substance to be deposited. If zinc is used for reduction, the subsequent step of separating impurity zinc is also needed, the process flow is long, time and labor are wasted, and the energy consumption is large.
The invention content is as follows:
the purpose of the invention is as follows: the invention aims to provide a method for directly electrodepositing gold in two phases formed by a gold-containing extraction organic phase and an electrolyte-containing aqueous phase, aiming at the actual defects of the prior art, which completes the back extraction, the reduction, the deposition and the purification of the gold in one step, has simple process, less time consumption and less reagent consumption, obtains the gold with high quality and high recovery rate, and avoids the complicated subsequent steps of refining the gold and the like.
The technical scheme is as follows:
the invention relates to a method for preparing high-purity gold by electrolyzing extracted gold-containing organic phase, which comprises the following steps:
firstly, an extraction organic phase is composed of an extracting agent, an extraction assisting agent and a solvent, and gold cyanide is extracted to obtain a gold-containing extraction organic phase;
wherein the extractant and the extraction aid are selected from: phosphoric acid esters, acidic phosphonic acid esters, amines, cationic surfactants, nonionic surfactants, alcohols, ethers or ketones or a mixture of two or three thereof; wherein the solvent is selected from C6The above liquid alkane or aromatic hydrocarbon or industrial solvent;
secondly, electrolyzing the electricity consisting of two phases of the gold-containing extraction organic phase and the electrolyte-containing aqueous solutionThe electrolyte solution has a cell voltage of 2.0-3.5V and a current density of 100-2；
The electrolyte in the above-mentioned electrolyte-containing aqueous solution is selected from: a soluble perchlorate, halide, nitrate, thiocyanate, soluble hydroxide or a mixture thereof, the aqueous solution having a pH of 8 to 14;
the anode material used in electrolysis is selected from: graphite, gold, platinum, titanium alloy, stainless steel, steel wire mesh, steel fiber cotton or carbon fiber;
the cathode material used in electrolysis is selected from: graphite, gold, platinum, titanium alloy, stainless steel, steel wire mesh, steel fiber cotton or carbon fiber.
The method for preparing high-purity gold by electrolyzing gold-containing extraction organic phase can be composed of 5-40% of methyl trialkyl ammonium chloride (N263), 5-50% of isooctanol and 10-90% of acid-washed kerosene by volume percentage; the water phase is 0.1-5.0mol/L electrolyte solution, and the electrolysis is carried out under constant current.
The method for preparing high-purity gold by electrolyzing gold-containing extraction organic phase can also comprise tetradecyl-dimethyl-benzyl ammonium chloride, tributyl phosphate and dodecane, wherein the mol ratio of the tetradecyl-dimethyl-benzyl ammonium chloride to aqueous phase gold is (0.5-10) to 1, and the volume percentage content of the tributyl phosphate is 5-40%; the water phase is 0.1-5.0mol/L electrolyte solution, and the electrolysis is carried out under constant current.
The invention relates to a method for preparing high-purity gold by electrolyzing gold-containing extraction organic phase, wherein the extraction organic phase can also consist of hexadecyl-trimethyl ammonium bromide, tributyl phosphate and dodecane, the molar ratio of the hexadecyl-trimethyl ammonium bromide to the aqueous phase gold is 0.5-10: 1, and the volume percentage of the tributyl phosphate is 5-40%; the water phase is 0.1-5.0mol/L electrolyte solution, and the electrolysis is carried out under constant current.
The principle and the positive effects of the invention are as follows:
the principle of the invention is as follows: the gold in the organic phase is back-extracted to the water phase by utilizing the water phase with certain back-extraction capacity, so that the electrolytic reaction can occur, the gold concentration in the water phase after electrolysis is reduced, the reaction is balanced and moved, the gold concentration in the organic phase is gradually reduced, and finally the electrolysis is complete. Solves the problem of difficult back extraction in the process of extracting and recovering gold by using a cationic surfactant.
The invention has high extraction selectivity and gold enrichment; electrolyte is added into the water phase, and electrolysis is carried out under the condition of coexistence of two phases, so that the quality and the recovery rate of the obtained gold are improved, the cost for producing the gold is integrally reduced, and theoretical and practical bases are provided for industrialization of a process for extracting the gold by an extraction method.
The invention has the following characteristics and excellent effects:
1. the method overcomes the problems in the prior method for obtaining gold, obtains a high-purity product, and is simple, convenient and quick;
2. the method solves the problem of difficult back extraction by an electrolysis method by utilizing the advantages of high selectivity and good effect of an extracting agent, obtains high-purity gold at one time with high efficiency, and omits the subsequent step of a conventional extraction method required when only the extraction method is used for extracting the gold.
The specific implementation scheme is as follows:
the invention makes a specific implementation scheme for the gold-containing extraction organic phase with the gold-containing concentration of 1ppm-100 g/L; in order to illustrate the present invention more clearly, the following examples are given without any limitation to the scope of the present invention.
Example 1
Taking 10mL of extracted organic phase methyl trialkyl ammonium chloride (N263), isooctanol and acid-washed kerosene, wherein the volume ratio of the extracted organic phase methyl trialkyl ammonium chloride (N263) to the acid-washed kerosene is as follows: 10: 20: 70, containing 100ppm gold; 10mL of water phase, which is 1.0mol/L potassium chloride (KCl) solution; the anode adopts a platinum electrode, and the cathode is a stainless steel plate; constant current, electrolyzing for a certain time, washing the cathode, and obtaining gold with the surface of the cathode golden yellow, wherein the deposition rate is more than 95 percent.
Example 2
Taking 10mL of extracted organic phase tetradecyl-dimethyl-benzyl ammonium chloride, tributyl phosphate and dodecane, wherein the molar ratio of the tetradecyl-dimethyl-benzyl ammonium chloride to aqueous phase gold is 0.5: 1, and the volume percentage content of the tributyl phosphate is 15%, wherein the volume percentage content of the tributyl phosphate contains 1g/L of gold; aqueous phase10mL of NaClO solution containing 1.0mol/L4Water solution, wherein the cathode and the anode adopt stainless steel plates; constant current, electrolyzing for a certain time, washing the cathode, and obtaining gold with the surface golden yellow, wherein the deposition rate is more than 95 percent.
Example 3
Taking 10mL of cetyl-trimethyl ammonium bromide, tributyl phosphate anddodecane in an extracted organic phase, wherein the molar ratio of the cetyl-trimethyl ammonium bromide to aqueous phase gold is 0.5: 1, and the volume percentage of the tributyl phosphate is 20%, wherein the volume percentage of the tributyl phosphate contains 0.5g/L of gold; 10mL of aqueous phase, 2.0mol/L of NaClO4A solution; the anode adopts a platinum electrode, and the cathode is a stainless steel plate; constant current, electrolyzing for a certain time, washing the cathode, and obtaining gold with the surface of the cathode golden yellow, wherein the deposition rate is more than 95 percent.
Claims (4)
1. A method for preparing high-purity gold by electrolyzing extracted gold-containing organic phase comprises the following steps:
1) an extraction organic phase is composed of an extracting agent, an extraction assisting agent and a solvent, and gold cyanide is extracted to obtain a gold-containing extraction organic phase;
wherein the extractant and the extraction aid are selected from: phosphates, acidic phosphonates, amines, alcohols or a mixture of two or three thereof; wherein the solvent is selected from C6The above liquid paraffin or acid-washed kerosene;
2) electrolyzing the electrolyte consisting of two phases of gold-containing extraction organic phase and electrolyte-containing aqueous solution, wherein the cell voltage is 2.0-3.5V, and the current density is 100-2；
The electrolyte in the above-mentioned electrolyte-containing aqueous solution is selected from: a soluble perchlorate salt, halide or mixture thereof, the aqueous solution having a pH of 8 to 14;
the anode material used in electrolysis is selected from: graphite, gold, platinum, titanium alloy, stainless steel, steel wire mesh, steel fiber cotton or carbon fiber;
the cathode material used in electrolysis is selected from: graphite, gold, platinum, titanium alloy, stainless steel, steel wire mesh, steel fiber cotton or carbon fiber.
2. The process for producing high purity gold according to claim 1 by electrolyzing the gold-containing extracted organic phase, wherein the extracted organic phase is composed of 5 to 40% by volume of methyl trialkyl ammonium chloride, 5 to 50% by volume of isooctanol, and 10 to 90% by volume of acid-washed kerosene; the water phase is 0.1-5.0mol/L electrolyte solution, and the electrolysis is carried out under constant current.
3. The process for the preparation of high purity gold by electrolysis of an gold-containing extracted organic phase according to claim 1, characterized in that the extracted organic phase consists of tetradecyl-dimethyl-benzyl ammonium chloride, tributyl phosphate and dodecane in an amount such that the molar ratio of tetradecyl-dimethyl-benzyl ammonium chloride to aqueous phase gold is 0.5-10: 1 and the percentage by volume of tributyl phosphate is 5-40%; the water phase is 0.1-5.0mol/L electrolyte solution, and the electrolysis is carried out under constant current.
4. The process for the preparation of high purity gold by electrolysis of an gold-containing extracted organic phase according to claim 1, characterized in that the extracted organic phase consists of cetyl-trimethylammonium bromide, tributyl phosphate and dodecane, the molar ratio of cetyl-trimethylammonium bromide to aqueous phase gold being 0.5-10: 1, the percentage by volume of tributyl phosphate being 5-40%; the water phase is 0.1-5.0mol/L electrolyte solution, and the electrolysis is carried out under constant current.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011418990A CN1153850C (en) | 2001-09-19 | 2001-09-19 | Process for preparing high-purity gold by electrolyzing extracted gold-contained organic phase |
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| CNB011418990A CN1153850C (en) | 2001-09-19 | 2001-09-19 | Process for preparing high-purity gold by electrolyzing extracted gold-contained organic phase |
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| CN1342786A CN1342786A (en) | 2002-04-03 |
| CN1153850C true CN1153850C (en) | 2004-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350017A (en) * | 2015-11-30 | 2016-02-24 | 长春黄金研究院 | Method increasing rate of filtration of desorbed and electrolyzed gold mud |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724973A (en) * | 2019-11-19 | 2020-01-24 | 安徽焦冲矿业有限公司 | Efficient environment-friendly high-purity gold preparation method |
| CN114349143B (en) * | 2021-12-23 | 2023-04-14 | 扬州大学 | Complex coacervate phase system and preparation method and application thereof |
| CN114941076B (en) * | 2022-06-28 | 2023-06-02 | 中国矿业大学 | Method for extracting and recovering gold from aqueous solution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350017A (en) * | 2015-11-30 | 2016-02-24 | 长春黄金研究院 | Method increasing rate of filtration of desorbed and electrolyzed gold mud |
| CN105350017B (en) * | 2015-11-30 | 2017-05-03 | 长春黄金研究院 | Method increasing rate of filtration of desorbed and electrolyzed gold mud |
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| CN1342786A (en) | 2002-04-03 |
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