CN106637314A - Preparation method of sodium gold sulfide solution for cyanide-free gold plating - Google Patents
Preparation method of sodium gold sulfide solution for cyanide-free gold plating Download PDFInfo
- Publication number
- CN106637314A CN106637314A CN201611159618.8A CN201611159618A CN106637314A CN 106637314 A CN106637314 A CN 106637314A CN 201611159618 A CN201611159618 A CN 201611159618A CN 106637314 A CN106637314 A CN 106637314A
- Authority
- CN
- China
- Prior art keywords
- gold
- sodium
- solution
- sub
- preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/48—Electroplating: Baths therefor from solutions of gold
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G7/00—Compounds of gold
- C01G7/006—Compounds containing, besides gold, two or more other elements, with the exception of oxygen or hydrogen
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a preparation method of a sodium gold sulfide solution for cyanide-free gold plating. The method comprises the following steps: firstly, dissolving and nitrating elemental gold by aqua regia to obtain a chlorate gold solution; secondly, adding sodium thiosulfate in the chlorate gold solution and reacting to generate a sodium gold thiosulfate; thirdly, adding ethanol and separating out sodium gold thiosulfate precipitation; fourthly, adding a sodium sulfide solution for complexing; and finally, carrying out filtering by using activated carbon to remove sulfur, thus obtaining the sodium gold sulfide solution. The preparation method provided by the invention is simple in process and convenient to operate; the yield of the sodium gold thiosulfate generated by reacting gold chlorate with the sodium thiosulfate is high, and the loss is less; in addition, the sodium gold thiosulfate is stable and is easy to separate; the complexing conversion rate of the sodium gold thiosulfate and the sodium sulfide is high, so that a product obtained by the method provided by the invention is high in purity; and in addition, the utilization rate of precious metal gold is also high, and the prepared sodium gold sulfide solution is more stable.
Description
Technical field
The present invention relates to a kind of preparation method of water-soluble gold salt, more particularly to a kind of water-soluble gold salt of cyanogen-less gold
Preparation method, specifically relate to a kind of preparation method of the gold sodium sulfide solution of cyanogen-less gold.
Background technology
At present, craft of gilding conventional both at home and abroad has cyanide craft of gilding and the big class of cyanogen-less gold technique two.Due to cyanogen
The stability of compound class solution is high, applicable elements width, so cyanide craft of gilding is widely used for a long time by people, but by
There is hypertoxic cyanide in plating solution, understand serious environment pollution and huge injury is caused to human body, and resist can be caused
Harmful effect, thus be gradually eliminated.Although National Development and Reform Commission issued in 2013 to postpone eliminating cyanogen-containing gold-plated work
The notice of skill, but either government or industry, still there is strong requirement to cyanogen-less gold technique, and gold-plated will be not without cyaniding
Reversible trend.Current cyanogen-less gold technique, mainly there is that sulphite is gold-plated, halide is gold-plated, thiosulfate is gold-plated
Gold-plated with thiomalic acid etc., more ripe cyanogen-less gold technique is that sulphite is gold-plated.
The Chinese invention patent application of Application No. 200910227579.4, discloses a kind of cyanogen-less gold sulfurous acid gold
The step of preparation method of sodium complex, the method is " to prepare gold chloride-alkali and neutralize-add sodium sulfite-filtering and concentrating
Obtain sediment-drying precipitate and crush to obtain product ", because the method does not carry out separation of solid and liquid, band in product in alkali with rear
There are a large amount of chlorides, cause product purity not high, in addition, in alkali and being by Au3+It is precipitated as the form of gold hydroxide, and hydroxide
Gold is unstable, and easily dehydration is converted into gold oxide, and then resolves into elemental gold, causes the utilization rate of gold low.
The Chinese invention patent application of Application No. 201510942820.7, discloses a kind of cyanogen-less gold reagent sulfurous acid
The step of preparation method of golden sodium, the method is that " gold rolls-cleans gold bullion-gold and dissolves-catch up with nitre process-alkalization-solid-liquid point
From-cleaning-complex reaction-condensing crystallizing ", although said method carries out separation of solid and liquid after alkalization, but due in alkali and after
The gold hydroxide settling stability for obtaining is poor, is not easy to washing and separates, and to obtain the low product of impurity content, cumbersome, and
And gold hydroxide is not high for the conversion ratio of gold sodium sulfide with sodium sulfite complexing, the utilization rate of precious metal gold can be caused
It is low.
The content of the invention
To solve the problem with present on, it is an object of the invention to provide a kind of gold sodium sulfide solution of cyanogen-less gold
Preparation method, high and precious metal gold the utilization rate of the method process is simple, product purity is high.
To realize object above, the preparation method of the gold sodium sulfide solution of the cyanogen-less gold of the present invention includes successively
Following steps：
（1）Put into elemental gold in a reservoir, add chloroazotic acid, be completely dissolved gold at 40 ~ 70 DEG C of temperature；
（2）By step（1）The solution for obtaining reduced pressure concentration at temperature≤90 DEG C, the mass concentration for being concentrated into GOLD FROM PLATING SOLUTION is 40
～50%, stop heating, room temperature is cooled to, separate out gold chloride crystallization；
（3）Plus pure water dissolving gold chloride crystallizes to that the mass concentration of GOLD FROM PLATING SOLUTION is 10～25%, and mass concentration is added under agitation
For 20～40% hypo solution, 3-4 hours are reacted, obtain the sub- gold sodium solution of thiosulfuric acid, the addition of sodium thiosulfate
Measure as 1.5-2.5 times of golden weight in chlorauric acid solution；
（4）Add the ethanol of the sub- gold sodium solution volume of 2～5 times of thiosulfuric acids molten toward the sub- gold sodium solution of thiosulfuric acid under agitation
Liquid, the sub- gold sodium of thiosulfuric acid is to be precipitated to leach precipitation when no longer separating out with Precipitation, obtains the sub- gold sodium of thiosulfuric acid and consolidates
Body；
（5）The sodium sulfite solution that mass concentration is 20% is added in the sub- gold sodium solid of thiosulfuric acid, 30～50 DEG C are heated to,
The closed stirring of insulation 2～8 hours, the addition of sodium sulfite is the 0.5- of the contained gold weight of the sub- gold sodium crystallization of thiosulfuric acid
0.8 times；
（6）Toward step（5）Activated carbon is added in the solution for obtaining, is filtered, with pure water gold content is adjusted, obtain gold sodium sulfide molten
Liquid.
To be further purified the sub- gold sodium crystallization of thiosulfuric acid, the purity of product is more preferably improved, in above-mentioned steps（4）Obtain sulphur
Filter after the pure water dissolving that 2～5 times of solid weights are added in the sub- gold sodium solid of thiosulfuric acid, then 2～5 times of filtrates are added in filtrate
The ethanol of volume, separates out the sub- gold sodium crystallization of thiosulfuric acid after purification.
In order that gold is easy to dissolving, while avoiding the excess of chloroazotic acid, above-mentioned steps（1）Middle gold feeds intake again with chloroazotic acid
Amount is than being 1:5～8.
In order to more preferably distill excessive chloroazotic acid, above-mentioned steps（2）Reduced pressure concentration be vacuum be less than -0.08Mpa
Under the conditions of reduced pressure concentration.
In order to catch up with except the nitric acid in chlorauric acid solution, above-mentioned steps as far as possible（2）Be concentrated into distillate speed it is slower when, it is point many
Secondary to add appropriate hydrochloric acid to producing without rufous gas, the hydrochloric acid total amount for repeatedly adding is the 1-3 of gold weight contained by solution
Times.
The number of times that above-mentioned hydrochloric acid is added is preferred 3-4 time.
In order that gold sodium sulfide solution storage is more stable, above-mentioned steps（6）Sulfite gold sodium solution is adjusted with pure water
It is whole to gold concentration be 80～100g/L.
The preparation method of the gold sodium sulfide solution of the cyanogen-less gold of the present invention, first prepares chlorauric acid solution, then in chlorine
Sodium thiosulfate is added in auric acid solution, the sub- gold sodium of thiosulfuric acid is formed, adds ethanol to separate out precipitation, precipitation and separation is added
Sodium sulfite is complexed, and then filters adjustment gold content and obtains finished product, due to the thio sulphur that gold chloride and sodium thiosulfate reaction are generated
Sour sub- gold sodium recovery rate is high, loss is few, and the sub- gold stable sodium of thiosulfuric acid is easily isolated, and with sodium sulfite high conversion rate is complexed,
Thus product obtained by the method for the present invention not only purity is high, and the utilization rate of precious metals gold is also high.The preparation of the present invention
Method, process is simple, using the sub- gold sodium of thiosulfuric acid under the complexing environment of sodium sulfite, there is disproportionated reaction and be obtained in itself
Gold sodium sulfide solution it is more stable, be conducive to promote cyanogen-less gold process of industrialization.
Specific embodiment
Technical scheme is further described with reference to specific embodiment, but these embodiments are not used
To limit the scope of the invention, on the premise of without departing from theory of the present invention, such as to chloric acid gold preparation process or technique ginseng
Several changes, all should belong to protection scope of the present invention.
Embodiment 1
（1）Cutting 8.2g gold（Containing gold 99.99%）, in being slowly put into the flask with sour device for absorbing tail gas, add new preparation
Chloroazotic acid 50g, 60 DEG C are slowly heated under agitation, be incubated to gold and be completely dissolved；
（2）Decompressor is connected, control vacuum is less than -0.08Mpa, opens heating water bath, above-mentioned solution is controlled at 90 DEG C
Within reduced pressure concentration, be concentrated into distillate speed it is slower when, points of 3 times addition hydrochloric acid 16g, to the rufous gas without nitrogen oxides
Produce, continue to concentrate, until it is 48% to detect the gold concentration in solution, stop heating, be cooled to room temperature, separate out gold chloride knot
It is brilliant；
（3）The dissolving of 24g pure water is added toward gold chloride crystallization, adjustment gold concentration is 20%, adds 54.7g dense under agitation
The hypo solution for 30% is spent, reaction 3 hours is stirred at room temperature, generate the sub- gold sodium of thiosulfuric acid；
（4）Add 95% ethanol 250ml toward above-mentioned solution under agitation, the sub- gold sodium of thiosulfuric acid, will be heavy with Precipitation
Shallow lake leaches, and filters in the precipitation for leaching plus after the dissolving of 50g pure water, adds 95% ethanol 200ml in filtrate under agitation, analyses
Go out the sub- gold sodium crystallization of refined thiosulfuric acid, leach standby；
（5）The sub- gold sodium crystallization of refined thiosulfuric acid is put into into flask, plus pure water 50g dissolvings, 20% sodium sulfite solution is added
24g, is heated to 45 DEG C, and sealed thermal insulating is stirred 6 hours, is changed into gold sodium sulfide solution and is separated out a small amount of sulphur；
（6）0.5g activated carbons are added toward solution, after stirring half an hour sulphur removal is filtered, with pure water content is adjusted, obtain colourless clear
Clear gold sodium sulfide solution 100ml, containing golden 80.3g/L.
Embodiment 2
（1）Cutting 8.3g gold（Containing gold 99.99%）, in being slowly put into the flask with sour device for absorbing tail gas, add new preparation
Chloroazotic acid 50g, 55 DEG C are slowly heated under agitation, be incubated to gold and be completely dissolved；
（2）Decompressor is connected, control vacuum is less than -0.08Mpa, opens heating water bath, above-mentioned solution is controlled at 90 DEG C
Within reduced pressure concentration, be concentrated into distillate speed it is slower when, points of 4 times addition hydrochloric acid 20g, to the rufous gas without nitrogen oxides
Produce, continue to concentrate, until the concentration for detecting GOLD FROM PLATING SOLUTION is 45%, stop heating, be cooled to room temperature, separate out gold chloride knot
It is brilliant；
（3）The dissolving of 25g pure water is added toward gold chloride crystallization, adjustment gold concentration is 20%, and 55g concentration is added under agitation
For 30% hypo solution, stirring reaction 4 hours under room temperature, the sub- gold sodium of thiosulfuric acid is generated；
（4）Add 95% ethanol 300ml toward above-mentioned solution under agitation, the sub- gold sodium of thiosulfuric acid, will be heavy with Precipitation
Shallow lake leaches, and adds in the precipitation for leaching and is filtered after the dissolving of 50g pure water, adds 95% ethanol 250ml in filtrate under agitation,
The sub- gold sodium crystallization of refined thiosulfuric acid is separated out, is leached standby；
（5）The sub- gold sodium crystallization of refined thiosulfuric acid is put into into flask, plus pure water 50g dissolvings, 20% sodium sulfite solution is added
25g, is heated to 50 DEG C, and sealed thermal insulating is stirred 7 hours, is changed into gold sodium sulfide solution and is separated out a small amount of sulphur；
（6）0.5g activated carbons are added toward solution, sulphur removal is filtered after stirring half an hour, adjust content, obtain the Asia of achromaticity and clarification
Auric sulfate sodium solution 100ml, containing golden 80.4g/L.
By product obtained in above-described embodiment 1-2, its content and purity are detected, testing result such as following table：
As can be seen from the above table, the product that this is obtained by invention preparation method, purity is high, and gold utilization rate reaches more than 96%, and
Indices reach the same technical target of the product of international esbablished corporation.
Claims (7)
1. a kind of preparation method of the gold sodium sulfide solution of cyanogen-less gold, in turn includes the following steps：
（1）Put into elemental gold in a reservoir, add chloroazotic acid, be completely dissolved gold at 40 ~ 70 DEG C of temperature；
（2）By step（1）The solution for obtaining reduced pressure concentration at temperature≤90 DEG C, the mass concentration for being concentrated into GOLD FROM PLATING SOLUTION is 40
～50%, stop heating, room temperature is cooled to, separate out gold chloride crystallization；
（3）Plus pure water dissolving gold chloride crystallizes to that the mass concentration of GOLD FROM PLATING SOLUTION is 10～25%, and mass concentration is added under agitation
For 20～40% hypo solution, 3-4 hours are reacted, obtain the sub- gold sodium solution of thiosulfuric acid, the addition of sodium thiosulfate
Measure as 1.5-2.5 times of golden weight in chlorauric acid solution；
（4）Add the ethanol of the sub- gold sodium solution volume of 2～5 times of thiosulfuric acids molten toward the sub- gold sodium solution of thiosulfuric acid under agitation
Liquid, the sub- gold sodium of thiosulfuric acid is to be precipitated to leach precipitation when no longer separating out with Precipitation, obtains the sub- gold sodium of thiosulfuric acid and consolidates
Body；
（5）The sodium sulfite solution that mass concentration is 20% is added in the sub- gold sodium solid of thiosulfuric acid, 30～50 DEG C are heated to,
The closed stirring of insulation 2～8 hours, the addition of sodium sulfite is the 0.5- of the contained gold weight of the sub- gold sodium crystallization of thiosulfuric acid
0.8 times；
（6）Toward step（5）Activated carbon is added in the solution for obtaining, is filtered, with pure water gold content is adjusted, obtain gold sodium sulfide molten
Liquid.
2. the preparation method of the gold sodium sulfide solution of cyanogen-less gold according to claim 1, it is characterised in that：Institute
State step（4）Obtain being filtered after the pure water dissolving of 2～5 times of solid weights of addition in the sub- gold sodium solid of thiosulfuric acid, then to filtrate
The ethanol of 2～5 times of filtrate volumes of middle addition, separates out the sub- gold sodium crystallization of thiosulfuric acid after purification.
3. the preparation method of the gold sodium sulfide solution of cyanogen-less gold according to claim 1 and 2, it is characterised in that：
The step（1）Middle gold is 1 with the charged material weight ratio of chloroazotic acid:5～8.
4. the preparation method of the gold sodium sulfide solution of cyanogen-less gold according to claim 3, it is characterised in that：It is described
Step（2）Reduced pressure concentration be vacuum be less than -0.08Mpa under conditions of reduced pressure concentration.
5. the preparation method of the gold sodium sulfide solution of cyanogen-less gold according to claim 4, it is characterised in that：It is described
Step（2）Be concentrated into distillate speed it is slower when, add appropriate hydrochloric acid to producing without rufous gas several times, repeatedly add
Hydrochloric acid total amount be 1-3 times of gold weight contained by solution.
6. the preparation method of the gold sodium sulfide solution of cyanogen-less gold according to claim 5, it is characterised in that：It is described
The number of times that hydrochloric acid is added is 3-4 time.
7. the preparation method of the gold sodium sulfide solution of cyanogen-less gold according to claim 6, it is characterised in that：It is described
Step（6）It is 80～100g/L that sulfite gold sodium solution pure water is adjusted to gold concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159618.8A CN106637314B (en) | 2016-12-15 | 2016-12-15 | A kind of preparation method of the gold sodium sulfide solution of cyanogen-less gold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159618.8A CN106637314B (en) | 2016-12-15 | 2016-12-15 | A kind of preparation method of the gold sodium sulfide solution of cyanogen-less gold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106637314A true CN106637314A (en) | 2017-05-10 |
| CN106637314B CN106637314B (en) | 2018-08-31 |
Family
ID=58823611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611159618.8A Active CN106637314B (en) | 2016-12-15 | 2016-12-15 | A kind of preparation method of the gold sodium sulfide solution of cyanogen-less gold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106637314B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986319A (en) * | 2017-12-01 | 2018-05-04 | 深圳市前海绿智源科技有限公司 | Method without cyanogen gold salt is prepared using the molten method of iodine |
| CN112301388A (en) * | 2019-07-25 | 2021-02-02 | 山东亿福金业珠宝首饰有限公司 | Cyanide-free electroplating process |
| CN113046800A (en) * | 2021-02-04 | 2021-06-29 | 深圳市金正龙科技有限公司 | Gold sodium sulfite electroplating solution and preparation method thereof |
| WO2022091427A1 (en) * | 2020-10-30 | 2022-05-05 | 松田産業株式会社 | Potassium gold cyanide crystal and pottassium gold cyanide solution |
| TWI766824B (en) * | 2021-02-25 | 2022-06-01 | 日商松田產業股份有限公司 | Gold plating solution containing sulfite gold salt and supplementary solution for gold plating solution containing gold salt sulfite |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3438748A (en) * | 1965-12-29 | 1969-04-15 | Agfa Gevaert Nv | Method for the preparation of thiogold (1) compounds |
| US3966880A (en) * | 1975-06-17 | 1976-06-29 | American Chemical & Refining Company Inc. | Method for producing alkali metal gold sulfite |
| JP2006249485A (en) * | 2005-03-10 | 2006-09-21 | Japan Pure Chemical Co Ltd | Gold sulfite salt aqueous solution for gold plating |
| CN101734708A (en) * | 2009-12-22 | 2010-06-16 | 三门峡朝阳科技有限公司 | Preparation method of cyanide-free gold sodium sulfite complex for gold plating |
| CN105568269A (en) * | 2015-12-16 | 2016-05-11 | 励福(江门)环保科技股份有限公司 | Preparation method of cyanide-free gold plating reagent sodium gold sulfite |
-
2016
- 2016-12-15 CN CN201611159618.8A patent/CN106637314B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3438748A (en) * | 1965-12-29 | 1969-04-15 | Agfa Gevaert Nv | Method for the preparation of thiogold (1) compounds |
| US3966880A (en) * | 1975-06-17 | 1976-06-29 | American Chemical & Refining Company Inc. | Method for producing alkali metal gold sulfite |
| JP2006249485A (en) * | 2005-03-10 | 2006-09-21 | Japan Pure Chemical Co Ltd | Gold sulfite salt aqueous solution for gold plating |
| CN101734708A (en) * | 2009-12-22 | 2010-06-16 | 三门峡朝阳科技有限公司 | Preparation method of cyanide-free gold sodium sulfite complex for gold plating |
| CN105568269A (en) * | 2015-12-16 | 2016-05-11 | 励福(江门)环保科技股份有限公司 | Preparation method of cyanide-free gold plating reagent sodium gold sulfite |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986319A (en) * | 2017-12-01 | 2018-05-04 | 深圳市前海绿智源科技有限公司 | Method without cyanogen gold salt is prepared using the molten method of iodine |
| CN112301388A (en) * | 2019-07-25 | 2021-02-02 | 山东亿福金业珠宝首饰有限公司 | Cyanide-free electroplating process |
| WO2022091427A1 (en) * | 2020-10-30 | 2022-05-05 | 松田産業株式会社 | Potassium gold cyanide crystal and pottassium gold cyanide solution |
| JP2022072658A (en) * | 2020-10-30 | 2022-05-17 | 松田産業株式会社 | Gold potassium cyanide crystal and gold potassium cyanide solution |
| CN113046800A (en) * | 2021-02-04 | 2021-06-29 | 深圳市金正龙科技有限公司 | Gold sodium sulfite electroplating solution and preparation method thereof |
| TWI766824B (en) * | 2021-02-25 | 2022-06-01 | 日商松田產業股份有限公司 | Gold plating solution containing sulfite gold salt and supplementary solution for gold plating solution containing gold salt sulfite |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106637314B (en) | 2018-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106637314A (en) | Preparation method of sodium gold sulfide solution for cyanide-free gold plating | |
| JP3085173B2 (en) | Concentration separation and recovery method of rare earth metal from oxidized ore | |
| CA1096588A (en) | Recovery of selenium | |
| CN113215412B (en) | Method for selectively leaching and recovering silver on surface of waste silver-plated part or silver-containing solid waste | |
| CN102994747A (en) | Technology for recovering metallic copper from high-lead copper matte | |
| CN101514396A (en) | Method for separating tin and stibium from tin-lead anode slime | |
| CN103993173B (en) | Method for the dechlorination of hydroxide nickel cobalt | |
| CN107758752A (en) | A kind of method for preparing chloro-iridic acid | |
| CN109704295B (en) | Method for preparing refined tellurium | |
| CN103449517B (en) | Method for preparing white arsenic from arsenic-containing dust in evaporation-free manner | |
| CN108950199A (en) | A method of it being used for the nickel and cobalt solution of synthesis of ternary presoma using the preparation of nickel sulfide cobalt ore | |
| US8715615B2 (en) | Recovery of high purity lead oxide from lead acid battery paste | |
| CN110078099A (en) | A method of scavenging solution, which is leached, from lepidolite prepares lithium carbonate | |
| CN112553478A (en) | Method for quickly leaching nickel hydroxide cobalt sulfuric acid system | |
| CN106893861B (en) | Golden agent of a kind of sulfur-bearing environmental protection leaching and preparation method thereof | |
| CN110423901B (en) | Method for separating sodium vanadium chromium from vanadium chromium solution | |
| CN105965030A (en) | Technique for recovering gold from gold iodide liquid waste | |
| CN109402392B (en) | Method for extracting tellurium from copper anode slime | |
| CN106435200A (en) | Method for enriching as well as separating and recovering tellurium and bismuth from solution | |
| CN109943733A (en) | A kind of crude cobalt/nickel salt raw material efficiently separates cobalt/nickel magnesium manganese method | |
| GB2358874A (en) | Obtaining ultra-pure silver from crude silver halide matrix | |
| CN114317982B (en) | Method for separating and recovering tungsten and cobalt from cobalt-dissolving liquid recovered from hard alloy grinding material | |
| JP2006144102A (en) | Method for recovering nickel and/or cobalt sulfide | |
| CN111850296B (en) | Method for recovering and preparing high-purity strontium compound from rare earth ore | |
| CN114517263A (en) | Method for extracting and recovering nickel from nickel-containing waste capacitor material and preparing nickel product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |