CN111304457A - Efficient activation dissolving method for rhodium powder - Google Patents
Efficient activation dissolving method for rhodium powder Download PDFInfo
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- CN111304457A CN111304457A CN202010202522.5A CN202010202522A CN111304457A CN 111304457 A CN111304457 A CN 111304457A CN 202010202522 A CN202010202522 A CN 202010202522A CN 111304457 A CN111304457 A CN 111304457A
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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
- C22B11/06—Chloridising
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/02—Methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/10—Dissolving using driven stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/80—After-treatment of the mixture
- B01F23/808—Filtering the mixture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
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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
- C22B11/042—Recovery of noble metals from waste materials
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/45—Mixing in metallurgical processes of ferrous or non-ferrous materials
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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 discloses a high-efficiency activation dissolving method of rhodium powder, which comprises the steps of mixing the rhodium powder with a hydrochloric acid solution according to a certain proportion, placing the mixture into a reactor, adding a certain amount of activating agent gold powder, controlling the temperature to be 60-112 ℃, and introducing Cl2Reaction for 1-3 hours, Cl2Recycled in the dissolving process, and filled with Cl2After finishing, preserving the heat for 10-90 min at a certain temperature, cooling to normal temperature, and filtering to obtain chlororhodic acid solution with the purity of more than 99.95% and the Rh content of more than 15%. The dissolution rate of rhodium in the invention is more than 96 percent, and Cl2Can be recycled in the dissolving process, and has the advantages of good environmental protection and short process flowThe method has the characteristics of high dissolving efficiency, high dissolving rate, basically no introduction of new impurities, high Rh content and purity of the obtained chlororhodic acid solution, low production cost and the like.
Description
Technical Field
The invention belongs to the field of nonferrous metallurgy, and particularly relates to a high-efficiency activation dissolving method of rhodium powder, which is also suitable for dissolving rhodium secondary resource materials.
Background
The dissolution of rhodium materials is known in several ways:
medium-temperature chlorination: mixing sodium chloride and rhodium-containing material in proportion, introducing Cl at 600-700 deg.C2And (4) dissolving. The method is easy to realize industrialized production, but has long dissolving period and small one-time treatment amountThe secondary dissolution rate is low, multiple times of dissolution are needed, the equipment is difficult to seal, and the operating environment is relatively poor.
Alkali fusion: mixing sodium hydroxide (barium hydroxide), sodium peroxide and rhodium-containing material according to a certain proportion, and carrying out high-temperature melting.
In patent CN200910073730.3, barium peroxide melting method is used to treat Pt-Rh binary alloy net aqua regia insoluble slag (rhodium content is 30-80%). The specific process is as follows: and (3) fully and uniformly mixing the aqua regia insoluble residue and 4-6 times of barium peroxide, heating to 800-950 ℃, and keeping the temperature for a period of time to convert rhodium into an acid-soluble compound. However, the method can introduce a large amount of barium impurities, which bring difficulty to the separation and purification of rhodium, and SO4 2-In the process of removing barium by precipitation, the precipitation carries and adsorbs part of rhodium, and the recovery rate of rhodium is reduced, so that only a few manufacturers use the method in China.
The method has relatively high dissolution rate, but has long period, serious equipment corrosion, easy introduction of impurities and poor safety.
Metal crushing method: mixing the material containing rhodium with base metals (Al, Fe, Cu, Zn, Ni, etc.) according to a certain proportion, melting at high temperature, cooling, dissolving the base metals in acid, and dissolving the acid-soluble slag in king water.
Patent No. cn198710005623.x, a method for dissolving and purifying alloy waste with high rhodium content (10%), wherein crude rhodium or alloy waste is subjected to aluminum alloying and crushing, aluminum is leached with hydrochloric acid, rhodium black is dissolved with hydrochloric acid and hydrogen peroxide, noble metal impurities are removed by solvent extraction with a crude chlororhodium acid solution, base metal impurities are removed by ion exchange, formic acid reduction is performed, and pure rhodium powder is obtained by hydrogen reduction. The purity of rhodium is 99.99%, and the direct yield is 90-95%. Patent No. cn198710005623.x, an alloy waste material with high rhodium content (10%) is subjected to aluminum alloying and crushing, hydrochloric acid is used for leaching aluminum, hydrochloric acid is added with hydrogen peroxide to dissolve rhodium black, crude chlororhodic acid solution is used for solvent extraction to remove noble metal impurities, ion exchange is used for removing base metal impurities, formic acid is used for reduction, and hydrogen is used for reduction to obtain pure rhodium powder. The purity of rhodium is 99.99%, and the direct yield is 90-95%. Patent CN201310146858.4, mixing the primarily treated spent noble metal catalyst with tin powder and a surface covering agent according to a certain proportion, heating in a medium-frequency induction furnace to crush the spent noble metal catalyst, cooling the obtained mixture, soaking the cooled mixture in 6N hydrochloric acid for 3 hours, filtering out insoluble substances containing rhodium, placing the insoluble substances containing rhodium in aqua regia to stir and dissolve, extracting the solution for multiple times by using an extraction liquid, combining the obtained organic phase solutions, back-extracting the organic phase solution by using an aqueous solution to obtain an aqueous solution containing high-concentration rhodium, and performing ammonium chloride precipitation, washing, calcination and hydrogen reduction on the aqueous solution containing rhodium to obtain high-purity rhodium powder, wherein the recovery rate of rhodium is 98.4-99.1%. In patent CN201210307709.7, a refractory rhodium-containing precious metal material and a base metal activator are mixed and then melted and activated at 1100-1500 ℃, and the activation time is 10-60 min. Selectively leaching base metals in the activated material by using a dilute acid solution, and carrying out procedures of dissolving leaching residues by adding an oxidant into hydrochloric acid and the like. The method is characterized in that the activating agent is metal iron powder, and the mass ratio of the insoluble noble metal material to the activating agent in the activating process is 1: 6-20, returning insoluble substances generated by dissolving the precious metals to re-burdening for melting and activating, wherein the dissolution rate of the precious metals is more than 98%, and the recovery rate is more than 99%.
The method has high dissolution rate, can be basically dissolved completely, but has long period and high energy consumption, and base metals are difficult to be completely removed by acid dissolution and are not suitable for dissolving pure rhodium materials.
Sodium (potassium) hydrogen sulfate fusion method: mixing sodium (potassium) bisulfate with rhodium-containing material in proportion, and melting at high temperature.
In patent CN201710068264.4, organic components of waste rhodium catalyst containing zirconium are removed by pyrogenic process, then the waste rhodium catalyst is melted by potassium bisulfate at 500-800 ℃, the melt is dissolved by water, and then zirconium rhodium is precipitated by adding alkali. The water-soluble sulfate was removed by filtration. Adding hydrochloric acid solution into the precipitate, controlling the concentration of hydrochloric acid to be more than 4N, stirring at 50-90 ℃ for 1 hour to leach rhodium, filtering to obtain an enriched rhodium-containing solution, and leaving most of zirconium in filter residues to be separated. Adjusting the rhodium concentration of the filtrate to 40-60 g/L, and heating to 70-90 ℃. Adjusting the pH value to 1-2 with sodium hydroxide, adding solid sodium nitrite, raising the pH value to 6-8, boiling for 0.5-2 hours to generate a nitrous acid complex from rhodium, continuously adjusting the pH value to 8-10 with alkali, boiling, cooling, and filtering to obtain an impurity-free rhodium solution. Adding a reducing agent into the solution to reduce the solution to obtain rhodium black. The total yield is more than 98 percent. Patent CN201610804013.3, 1g of rhodium powder and 45 g of potassium bisulfate analytical reagent are put into a burning pot to be fully mixed and uniformly stirred, 5g of potassium bisulfate analytical reagent is uniformly covered on the surface of the burning pot, the burning pot is put into a muffle furnace to be heated to 600 ℃ and kept for 4 hours, the burning pot is taken out of the muffle furnace and is put into a natural state to be cooled, and the mixed solution is transferred into a beaker after being cooled; adding 150 ml of ionized water, placing a beaker on a stirrer for heating and dissolving, filtering, adding 10% of sodium hydroxide into filtrate to control the pH value of the filtrate to be 7-7.5 for neutralizing and precipitating rhodium, washing the rhodium precipitate, and dissolving the rhodium precipitate by using sulfuric acid to obtain a rhodium sulfate solution.
The method has the advantages of poor environmental protection, large reagent consumption and long period.
5. Electrochemical dissolution method: in the hydrochloric acid system, rhodium material is placed at the anode, and the rhodium material is oxidized and dissolved into solution by virtue of electrode reaction.
The patents CN200810236526.4 and CN200610091177.2 adopt an electrochemical method to dissolve rhodium powder, when the ratio of hydrochloric acid to rhodium powder is 80:1, the one-time dissolution rate can reach 99 percent, and the ratio of hydrochloric acid to rhodium powder is reduced, and the one-time dissolution rate is reduced accordingly, which is different from 30 percent to 98 percent. In the patents CN201010238848.X and CN201010238846.0, hydrochloric acid is used as a medium, rhodium powder is used as a contact, the rhodium powder is dissolved under the action of alternating current arc, an alternating current arc electrolytic cell is adopted, the electrolytic voltage is 55 volts, 60 volts and 65 volts is variable, the electrolytic time is 3-6 hours, the dissolution rate is 34-96%, and the daily treatment capacity of 27 groups of alternating current arc electrolytic cells is about 3 kg.
The method has the advantages of good operating environment, stable reaction, long time consumption and low one-time dissolution rate.
6. High temperature high pressure dissolution process
Patent CN201210141673.X adopts microwave digestion to dissolve rhodium powder at high temperature and high pressure, wherein the rhodium powder is 0.1-0.3 g, the hydrochloric acid is 10-15 ml, the 30% hydrogen peroxide is 2-5 ml, the dissolving temperature is 180-220 ℃, the time is 60-120 min, and the rhodium powder can be completely dissolved. In patent CN200810058706.8, a precious metal insoluble rhodium material is mixed with an acid solution and an oxidant according to a certain proportion, and the mixture is placed in a special pressure container, the temperature is controlled to be 160-300 ℃, the oxygen partial pressure is 0-3.0 MPa, the reaction time is 1-3 hours, the precious metal rhodium material is rapidly dissolved under high temperature and high pressure to obtain an acid rhodium solution, and the dissolution rate is more than 98%. CN201110095721.1, loading a difficult-to-dissolve noble metal rhodium material, an acid solution and an oxidant into a corrosion-resistant, high-temperature-resistant and high-pressure-resistant reactor according to a certain liquid-solid ratio, placing the reactor into a microwave working platform, setting microwave power, and obtaining a rhodium solution through microwave-assisted dissolution under the conditions of a dissolution temperature of 160-260 ℃, a dissolution pressure of 0-3 MPa, and a dissolution time of 30-60 min, wherein the dissolution rate of rhodium is more than 98%.
The high-temperature high-pressure dissolution method has high requirements on equipment, is only used in analysis and detection or stays in a test stage, and has not yet realized industrialization at present.
7. Other dissolution methods
Patent CN201310120933.X, crushing and grinding rhodium waste with rhodium content higher than 10% to obtain crushed rhodium waste with granularity of 200-400 meshes, and fully and uniformly mixing the crushed rhodium waste with zinc powder with granularity of 200-300 meshes in a ratio of 1: 1-10 to obtain activated mixed powder; adding 1-10 times of hydrochloric acid with the concentration of 10-12 mol/L into a closed reactor, adding activated mixed powder while stirring at the temperature of 60-100 ℃, reacting for 40-80 minutes at the stirring speed of 80-200 rpm, filtering, washing filter residues for 1-5 times by using hot water with the concentration of 75-85 ℃ which is 8-12 times that of the filter residues, putting the filter residues into a glass reactor, adding 10-15% of hydrochloric acid with the concentration of 10-12 mol/L based on the weight of a rhodium material, adding concentrated sulfuric acid with the concentration of 95-98% based on the weight of the rhodium material, dissolving for 4-8 hours at the temperature of 140-200 ℃, cooling and filtering to obtain a rhodium sulfate sulfuric acid solution, wherein the rhodium dissolution rate is 93-96%. Patent CN201610475802.7, mixing rhodium powder and base metal powder according to a certain mass ratio; placing the mixture in a planetary mill for mechanical activation, then dissolving base metals by hydrochloric acid, separating solid from liquid, placing the mixture in an ultrasonic dissolution reactor for dissolution by aqua regia, wherein the dissolution rate of rhodium powder is more than 95%. The method improves the solubility of rhodium through activation treatment, but has long period, introduces impurity elements, and has certain potential safety hazard in hydrogen generation under acidic condition.
The method has the problems of poor operating environment, long dissolving period, low one-time dissolving rate, low dissolving efficiency, high equipment requirement, small treatment capacity, impurity introduction and the like.
Disclosure of Invention
The invention aims to provide a method for efficiently activating and dissolving rhodium powder aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme:
a method for efficiently activating and dissolving rhodium powder comprises the following steps:
(1) mixing rhodium powder, gold powder and hydrochloric acid according to a certain proportion, wherein the mass ratio of the rhodium powder to the gold powder to the hydrochloric acid is as follows: 100: 0.1-10: 0.3-2.
(2) Introducing Cl into the mixture in the step 12The mixture was dissolved to obtain a mixed solution.
(3) Stopping the introduction of Cl2And standing the mixed solution to generate chlororhodic acid.
(4) And (4) filtering and washing the mixed solution obtained in the step (3) to obtain filter residue and chlororhodic acid solution.
Further, in the step 1, the purity of the gold powder is more than 99.95%, and the mass percentage concentration of the hydrochloric acid is 36-38%.
Further, in the step 2, the dissolving temperature is 60-112 ℃, and Cl is added2The flow rate is 4-50L/min kg rhodium powder, and the dissolving time is 60-180 min.
Further, in the step 2, Cl2Can be recycled.
Further, in the step 3, the temperature of the mixed solution is 80-112 ℃ when the mixed solution is kept still, and the standing time is 10-90 min.
Further, in the step 3, the obtained filter residue can be used as a raw material for dissolving rhodium powder of the next batch.
Furthermore, in the step 4, the purity of the chlororhodic acid solution is more than 99.95 percent, the Au content is less than 1ppm, and the Rh content is more than 150 g/L.
The invention has the beneficial effects that:
the invention provides a high-efficiency activation dissolving method of rhodium powder2Dissolving in the system, and introducing an activator HAuCl4Satisfactory Rh dissolution rate can be obtained in a short time, and a high Rh content is obtainedH of (A) to (B)3RhCl6Solution, high production efficiency of equipment, and heat preservation treatment of H at certain temperature and time3RhCl6The Au content in the solution is reduced to below 1ppm, and the activator HAuCl4Very little (or Au) residue, and basically no influence on H3RhCl6The filter residue can be repeatedly used, and HAuCl does not need to be continuously added in the production process4(or Au) and rhodium powder are recovered at the same time, and the method has the advantages of good environmental protection, short process flow, short period, high dissolution rate, high unit equipment capacity, high recovery rate, low production cost and the like.
Detailed Description
The present invention will be described in more detail below with reference to examples. The invention is not limited by these examples, but rather the scope of the invention is set forth in the claims.
Example 1
Weighing 10kg of pure rhodium powder (99.99 percent), 50g of gold powder and 30kg of hydrochloric acid with the concentration of 36 to 38 percent, placing the materials into a glass reactor with the volume of 100L, starting stirring, and introducing Cl2At a flow rate of 80L/min, and Cl was turned on2And a circulating system, wherein the temperature is increased to 105 ℃, the chlorine gas is stopped to be introduced after the reaction is carried out for 60min, the temperature is reduced to 80 ℃, the temperature is kept and the standing is carried out for 10min at 80 ℃, then the stirring is started, the temperature is reduced to the normal temperature, the filtration is carried out, the filter residue is washed for 5 times by using 500ml of pure water of 100-. The weight of the dried filter residue is 105g, the components of the filter residue are rhodium and gold, and according to the content of the rhodium and the gold, rhodium powder, gold powder and hydrochloric acid are respectively added in proportion to form a mixture which is used as raw materials to dissolve rhodium powder of the next batch.
Example 2
Weighing 10kg of pure rhodium powder (99.99 percent), 1000g of gold powder and 50kg of hydrochloric acid with the concentration of 36 to 38 percent, placing the materials into a glass reactor with the volume of 100L, starting stirring, and introducing Cl2Flow 25L/min, and Cl was turned on2Circulating system, heating to 60 deg.C, reacting for 180min, stopping introducing chlorine gas, cooling to 112 deg.C, maintaining the temperature at 112 deg.C, standing for 60min, stirring, cooling to room temperature, filtering, and using 100 ml of pure water 500ml each timeWashing the filter residue for 5 times, and merging the washing liquid into the filtrate to obtain 54.70L of filtrate, wherein the filtrate contains 15.9 percent of Rh, about 180.99g/L, 0.5ppm of Au and 99.00 percent of rhodium dissolution rate. The weight of the dried filter residue is 300g, the components of the filter residue are rhodium and gold, and according to the content of the rhodium and the gold, rhodium powder, gold powder and hydrochloric acid are respectively added in proportion to form a mixture which is used as raw materials to dissolve rhodium powder of the next batch.
Example 3
Weighing 10kg of pure rhodium powder (99.99 percent), 500g of gold powder and 40kg of hydrochloric acid with the concentration of 36 to 38 percent, placing the materials into a glass reactor with the volume of 100L, starting stirring, and introducing Cl2Flow rate of 40L/min, and Cl was turned on2And a circulating system, heating to 60 ℃, stopping introducing chlorine after reacting for 70min, keeping the temperature at 110 ℃, standing for 10min, starting stirring, cooling to the normal temperature, filtering, washing the filter residue for 5 times by using 500ml of pure water 100 times, merging the washing liquid into the filtrate to obtain 46.20L of filtrate, and detecting that the filtrate contains 18.61 percent of Rh, about 208.87g/L, 0.7ppm of Au and 96.50 percent of rhodium dissolution rate. The weight of the dried filter residue is 850g, the components of the filter residue are rhodium and gold, and according to the content of the rhodium and the gold, rhodium powder, gold powder and hydrochloric acid are respectively added in proportion to form a mixture which is used as raw materials to dissolve rhodium powder of the next batch.
Example 4
Weighing 10kg of pure rhodium powder (99.99%), 100g of gold powder and 200kg of hydrochloric acid with the concentration of 5%, placing the materials in an enamel reactor with the volume of 500L, starting stirring, and introducing Cl2The flow rate is 500L/min, and Cl is turned on2And a circulating system, wherein the temperature is raised to 112 ℃, the chlorine gas is stopped to be introduced after the reaction is carried out for 100min, the temperature is reduced to 80 ℃, the temperature is kept at 80 ℃, the standing is carried out for 90min, then the stirring is started, the temperature is reduced to the normal temperature, the filtration is carried out, the filter residue is washed for 5 times by using 500ml of pure water of 100-. The weight of the dried filter residue is 250g, and according to the content of the filter residue, rhodium powder, gold powder and hydrochloric acid are respectively added in proportion to form a mixture which is used as raw materials to dissolve rhodium powder of the next batch.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for efficiently activating and dissolving rhodium powder is characterized by comprising the following steps:
(1) rhodium powder, gold powder and hydrochloric acid are mixed according to the mass ratio: 100: 0.1-10: 300-2000 to obtain a mixture, wherein the mass percentage concentration of the hydrochloric acid is 5-40%.
(2) Introducing Cl into the mixture in the step 12And reacting and dissolving the mixture to obtain a mixed solution.
(3) Stopping the introduction of Cl2And standing the mixed solution to generate chlororhodic acid.
(4) And (4) filtering and washing the mixed solution obtained in the step (3) to obtain filter residue and chlororhodic acid solution.
2. The method according to claim 1, wherein in the step 1, the purity of the gold powder is more than 99.95%, and the mass percentage concentration of the hydrochloric acid is 36-38%.
3. The method according to claim 1, wherein in the step 2, the reaction temperature is 60-112 ℃ and Cl2The flow rate is 2.5-50L/min kg rhodium powder, and the reaction time is 60-180 min.
4. The method of claim 1, wherein in step 2, Cl is2Can be recycled.
5. The method according to claim 1, wherein in the step 3, the temperature of the mixed solution is 80 to 112 ℃ and the standing time is 10 to 90 min.
6. The method according to claim 1, wherein the filter residue obtained in the step 3 can be used as a raw material for dissolving rhodium powder of a next batch.
7. The method according to claim 1, wherein the chlororhodic acid solution obtained in step 4 has a purity of > 99.95%, an Au content of < 1ppm and an Rh content of > 150 g/L.
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| CN114317999A (en) * | 2021-12-31 | 2022-04-12 | 郴州高鑫材料有限公司 | Method for preparing rhodium trichloride hydrate by doping crude rhodium and assisting in dissolution |
| CN114317999B (en) * | 2021-12-31 | 2023-08-04 | 郴州高鑫材料有限公司 | Method for preparing rhodium trichloride hydrate by doping and dissolving crude rhodium |
| CN114526974A (en) * | 2022-03-15 | 2022-05-24 | 贵研检测科技（云南）有限公司 | Method for dissolving insoluble noble metal sample |
| CN114526974B (en) * | 2022-03-15 | 2022-09-20 | 贵研检测科技（云南）有限公司 | Method for dissolving insoluble noble metal sample |
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