CN215209580U - System for extracting refined gold from palladium-silver-containing alloy gold - Google Patents
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Abstract
The utility model belongs to the field of precious metal hydrometallurgy, in particular to a system for extracting refined gold from palladium-containing silver alloy gold, which comprises a reaction kettle, wherein the upper end of the reaction kettle is provided with a hydrochloric acid charging hole and a nitric acid charging hole, the lower end of the reaction kettle is connected with the upper end of a filter tank a through a pipeline, and the middle part of the filter tank a is provided with filter cloth; a filtrate outlet of the filter tank a is connected with the upper end of the settling tank through a pipeline, and the upper end of the settling tank is provided with an ammonium chloride solution feed inlet; the lower end of the settling tank is connected with the upper end of the fine filter through a pipeline, and the lower end of the fine filter is connected with the upper end of the reduction kettle through a pipeline; the upper end of the reduction kettle is provided with a reducing agent charging port; the lower end of the reduction kettle is connected with the upper end of a filter tank b through a pipeline, and filter cloth is arranged in the middle of the filter tank b. The utility model discloses impurity palladium silver clearance is high, can synthesize and retrieve valuable metal, and the flow structure is brief briefly, low cost, and reaction environment is friendly, does not produce poisonous and harmful gas, and the reaction is high efficiency.
Description
Technical Field
The utility model relates to a system for extracting refined gold from palladium-silver alloy gold, which belongs to the field of precious metal hydrometallurgy.
Background
The prior art of wet gold extraction from palladium-silver-containing alloy gold adopts ammonium chloropalladate precipitation method-dichlorodiammine palladium method-aqueous solution chlorination gold separation palladium removal-gold reduction-qualified gold powder ingot casting process. The gold reduction uses a reducing agent which is generally sodium sulfite, sodium bisulfite, oxalic acid, chlorine gas, sulfur dioxide and the like, and the final reduction end point is reduction by controlling the potential. If palladium in the palladium-silver alloy gold cannot be pretreated, the concentration of palladium and silver in aqua regia gold-dissolving liquid is higher, firstly, the oxidation-reduction potential of palladium is closer to that of gold, palladium is easily separated out in the reduction process, single palladium of a gold ingot exceeds the standard, and the national standard gold requirement cannot be met; and secondly, the method for improving the reduction end point potential controls the palladium content in the gold powder, but the reduction rate of the gold is reduced, the direct yield of the gold is low, the returned materials are increased, and the gold refining cost is greatly increased.
The existing palladium precipitation method cannot meet the production requirements and the process flow in many aspects. A method for extracting refined gold from palladium-silver-containing anode mud (patent No. CN201410733134), have certain requirements for the temperature, and also need to soak with brine for a certain time in advance, the technological process is long, the gold liquid will raise the temperature and drive chlorine and produce HCL gas, remove palladium raw material medicine and add dimethylglyoxime and ammonium chloride, the operation is complicated, has greatly lengthened the production cycle, and the one-time reduction rate is only 90%, the reduction rate is low, unfavorable to industrial production; the gold powder after the process treatment contains less than or equal to 0.001 percent of palladium through test analysis, meets the standard that the national standard No. one gold palladium is less than or equal to 0.001 percent in 2003, but can not adapt to the standard of the new national standard No. one gold standard (Pd is less than or equal to 0.0005 percent) which is going to be delivered. How to further reduce the content of palladium is an important subject of research in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a draw concise gold system from containing palladium silver alloy gold to the not enough that above-mentioned prior art exists, not influencing the reduction gold powder that the output accords with IC-Au99.99 standard requirement under the circumstances of gold reduction rate, can further reduce the content of palladium in the reduction gold powder.
The specific technical scheme is as follows: a system for extracting refined gold from palladium-silver-containing alloy gold comprises a reaction kettle, wherein a hydrochloric acid charging port and a nitric acid charging port are arranged at the upper end of the reaction kettle, the lower end of the reaction kettle is connected with the upper end of a filter tank a through a pipeline, and filter cloth is arranged in the middle of the filter tank a;
a filtrate outlet of the filter tank a is connected with the upper end of the settling tank through a pipeline, and the upper end of the settling tank is provided with an ammonium chloride solution feed inlet; the lower end of the settling tank is connected with the upper end of the fine filter through a pipeline, and the lower end of the fine filter is connected with the upper end of the reduction kettle through a pipeline;
the upper end of the reduction kettle is provided with a reducing agent charging port; the lower end of the reduction kettle is connected with the upper end of a filter tank b through a pipeline, and filter cloth is arranged in the middle of the filter tank b; the reduction kettle is the same as the reaction kettle, but the added materials are different.
Gate valves are arranged on the feed inlet and the pipeline;
and a pump is arranged on a pipeline among the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle and the filter tank b.
Further, the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle, the filter tank b and the pipeline are made of plastic materials, and preferably made of polytetrafluoroethylene materials.
Furthermore, the filter cloth is made of terylene, polytetrafluoroethylene and polypropylene.
The utility model aims at realizing through the following technical scheme:
a system for extracting refined gold from palladium-silver alloy gold comprises the following specific steps:
(1) firstly, putting palladium-silver alloy gold quenching beads into a reaction kettle to be paved;
(2) mixing hydrochloric acid with the concentration of 8.8-10.0 mol/L and palladium-containing silver alloy gold according to the liquid-solid ratio of 3-3.5: 1 (namely the volume unit of liquid is the ratio of liter to the mass unit of solid is kilogram); adding 13-15 mol/L nitric acid and palladium-containing silver alloy gold according to a liquid-solid ratio of 0.8-1.3: 1 (namely the volume unit of liquid is the ratio of liter to the mass unit of solid is kilogram), reacting at 80-90 ℃ for 3-4 h, and then filtering to obtain silver chloride slag and aqua regia gold-dissolving liquid;
(3) injecting the aqua regia gold-dissolving solution obtained in the step (2) into a settling tank, adding ammonium chloride at room temperature, stirring and reacting for 10-30 min, and precipitating for at least 12h, wherein the solid-to-solid ratio of the ammonium chloride to palladium is 2-2.5: 1; then filtering to obtain filtrate which is aqua regia gold-containing liquid, wherein the palladium content of the aqua regia gold-containing liquid is 0.001-0.05 g/L, and filter cakes and precipitates are palladium precipitation slag and silver chloride slag;
(4) and (4) heating the aqua regia gold-containing liquid obtained in the step (3) to 40-50 ℃, adding anhydrous sodium sulfite to perform potential control reduction, stopping reduction when the potential reaches 730-750 mV, then filtering to obtain filter cakes, namely reduced gold powder, and allowing the filtrate to enter the next process step for continuous utilization.
The palladium content of the palladium-silver alloy-containing gold ammonium chloride treated by the method is less than or equal to 0.0005 percent in percentage by mass.
The utility model discloses mainly add the hydrochloric acid earlier with containing palladium silver alloy gold and add the nitric acid after and dissolve, dissolve the gold liquid and add the ammonium chloride and sink the palladium edulcoration to the aqua regia that obtains after filtering, carry out the secondary filter after the reaction finishes, the filtrating contains the gold liquid for the aqua regia. Adding a reducing agent into the aqua regia gold-containing solution, stopping reduction when the potential reaches 730-750 mV by a potential reduction method, filtering, continuously recovering valuable metals from the filtrate, and obtaining a filter cake as reduced gold powder.
Compared with the prior art, the utility model, have following advantage:
1. the utility model relates to an extract smart gold system in containing palladium silver alloy gold need not the heating, can operate at the room temperature, need not to adjust the pH value, and operation procedure is simple.
2. The utility model relates to an extract smart gold system in containing palladium silver alloy gold adopts ammonium chloride to sink the palladium after, and final finished product gold ingot palladium content less than or equal to 0.0005%, compares the national standard gold palladium of 2003 and is less than or equal to 0.001% standard, and palladium content is good an order of magnitude in the gold powder after handling, reaches the standard of new national standard gold standard (Pd is less than or equal to 0.0005%). For the purification of rare and precious metals, the process level is advanced. The lower the reduction rate is, the higher the potential control reduction potential is, and the less palladium and silver are in the gold powder, so that the single palladium in the gold powder basically exceeds the standard after the reduction rate is more than 90 percent in the conventional process at present.
3. The utility model provides a draw refined gold system in containing palladium silver alloy gold, adopt the utility model discloses a method can effectively separate the palladium in the high palladium silver alloy gold that contains, and the gold reduction rate is more than 96%.
4. The utility model relates to an extract smart gold system in containing palladium silver alloy gold, the flow structure is brief briefly, low cost, and when adopting ammonium chloride to sink palladium silver operation, reaction environment is good, does not produce poisonous and harmful gas, and the reaction is high efficiency.
Drawings
FIG. 1 is a connection diagram of the present invention;
wherein, 1, a reaction kettle; 2, a filter tank a; 3, filtering cloth; 4, a settling tank; 5, fine filtering; 6, a reduction kettle; 7 filtering tank b.
Detailed Description
As shown in figure 1, the system for extracting refined gold from palladium-silver-containing alloy gold comprises a reaction kettle 1, wherein the upper end of the reaction kettle 1 is provided with a hydrochloric acid charging hole and a nitric acid charging hole, the lower end of the reaction kettle 1 is connected with the upper end of a filter tank a2 through a pipeline, and the middle part of the filter tank a2 is provided with filter cloth 3;
a filtrate outlet of the filter tank a2 is connected with the upper end of the settling tank 4 through a pipeline, and the upper end of the settling tank 4 is provided with an ammonium chloride solution feed inlet; the lower end of the settling tank 4 is connected with the upper end of a fine filter 5 through a pipeline, and the lower end of the fine filter 5 is connected with the upper end of a reduction kettle 6 through a pipeline; the upper end of the reduction kettle 6 is provided with a reducing agent charging hole; the lower end of the reduction kettle 6 is connected with the upper end of a filter tank b7 through a pipeline, and filter cloth is arranged in the middle of the filter tank b 7; gate valves are arranged on the feed inlet and the pipeline; and a pump is arranged on a pipeline among the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle and the filter tank b. Further, the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle, the filter tank b and the pipeline are made of plastic materials, and preferably made of polytetrafluoroethylene materials. Further, the filter cloth 3 is made of terylene, polytetrafluoroethylene and polypropylene.
The specific operation is as follows: smelting and quenching beads of the palladium-silver-containing alloy gold, adding the beads into an aqua regia reaction kettle 1, paving the beads, opening an acid valve, and mixing hydrochloric acid with the concentration of 8.8-10.0 mol/L and the palladium-silver-containing alloy gold according to the weight ratio of the alloy gold and the liquid-solid ratio of 3-3.5: 1 (namely the volume unit of liquid is the ratio of liter to the mass unit of solid is kilogram); then adding 13-15 mol/L nitric acid and palladium-containing silver alloy gold according to a liquid-solid ratio of 0.8-1.3: 1 (namely the volume unit of liquid is the ratio of liter to the mass unit of solid is kilogram), and closing an acid valve after the addition of acid. Starting a heating system of the reaction kettle, setting the reaction temperature to be 80-90 ℃, and basically dissolving all the gold complex in the aqua regia after the reaction time is 3-4 hours; then the palladium gold-containing aqua regia is put into a filter tank a2 from the aqua regia reaction kettle for filtration to obtain silver chloride slag on the filter cloth 3, and the lower part of the filter tank a2 is aqua regia gold-dissolving liquid; conveying the aqua regia gold-dissolving solution into an aqua regia settling tank 4 through a pump, adding ammonium chloride at room temperature, stirring and reacting for 10-30 min, and precipitating for at least 12h, wherein the solid-solid ratio of the ammonium chloride to palladium is 2-2.5: 1; pumping the reacted liquid into a fine filter 5 through a pump for filtering to obtain filter cakes and precipitates, namely palladium precipitation slag and silver chloride slag, wherein the filtrate is aqua regia gold-containing liquid, and the palladium content of the aqua regia gold-containing liquid is 0.001-0.05 g/L; and (3) conveying the gold-containing aqua regia liquid into a reduction reaction kettle 6 through a pump, starting the reduction reaction kettle to heat, heating the gold-containing aqua regia liquid to 40-50 ℃, adding anhydrous sodium sulfite to carry out potential-controlled reduction, stopping reduction when the potential reaches 730-750 mV, then putting the mixture into a filter tank b7 to carry out filtration, wherein a filter cake obtained on filter cloth is reduced gold powder, and the reduced gold powder reaches the gold standard No. 1 of the national standard. The filtrate below the filter cloth enters the next process step for continuous utilization.
A method for extracting refined gold from palladium-silver alloy gold comprises the following steps:
(1) firstly, putting palladium-silver alloy gold quenching beads into a reaction kettle to be paved;
(2) mixing hydrochloric acid with the concentration of 8.8-10.0 mol/L and palladium-silver-containing alloy gold according to the liquid-solid ratio of 3-3.5: 1; then adding 13-15 mol/L nitric acid and palladium-containing silver alloy gold according to a liquid-solid ratio of 0.8-1.3: 1, reacting at 80-90 ℃ for 3-4 h, and then filtering to obtain silver chloride slag and aqua regia gold-dissolving liquid;
(3) injecting the aqua regia gold-dissolving solution obtained in the step (2) into a settling tank, adding ammonium chloride at room temperature, stirring and reacting for 10-30 min, and precipitating for at least 12h, wherein the solid-to-solid ratio of the ammonium chloride to palladium is 2-2.5: 1; then filtering to obtain filtrate which is aqua regia gold-containing liquid, wherein the palladium content of the aqua regia gold-containing liquid is 0.001-0.05 g/L, and filter cakes and precipitates are palladium precipitation slag and silver chloride slag;
(4) and (4) heating the aqua regia gold-containing liquid obtained in the step (3) to 40-50 ℃, adding anhydrous sodium sulfite to perform potential control reduction, stopping reduction when the potential reaches 730-750 mV, then filtering to obtain filter cakes, namely reduced gold powder, and allowing the filtrate to enter the next process step for continuous utilization.
Examples 1 to 18
(1) Firstly, putting palladium-silver alloy gold quenching beads into a reaction kettle to be paved;
(2) mixing hydrochloric acid with the concentration of 8.8mol/L and palladium-containing silver alloy gold according to the liquid-solid ratio of 3-3.5: 1; then adding 13mol/L nitric acid and palladium-containing silver alloy gold according to a liquid-solid ratio of 0.8-1.3: 1, reacting at 80-90 ℃ for 3-4 h, and then filtering to obtain silver chloride slag and aqua regia gold-dissolving liquid;
(3) injecting the aqua regia gold-dissolving solution obtained in the step (2) into a settling tank, adding ammonium chloride at room temperature, stirring and reacting for 10-30 min, and precipitating for at least 12h, wherein the solid-to-solid ratio of the ammonium chloride to palladium is 2-2.5: 1; then filtering to obtain filtrate which is aqua regia gold-containing liquid, and filter cakes and precipitates which are palladium precipitation slag and silver chloride slag;
(4) and (4) heating the aqua regia gold-containing liquid obtained in the step (3) to 40-50 ℃, adding anhydrous sodium sulfite to perform potential control reduction, stopping reduction when the potential reaches 730-750 mV, and then filtering to obtain a filter cake which is reduced gold powder.
The samples were sent to analyze the palladium content of the gold alloy, the addition amount of ammonium chloride, the palladium content of aqua regia after palladium precipitation, and the palladium content of the gold alloy after palladium precipitation, and the results are shown in the table below.
Examples 1 to 18 tests
Note: firstly, salting and then nitrating means that hydrochloric acid with the concentration of 8.8mol/L is mixed with the palladium-containing silver alloy gold, and then nitric acid with the concentration of 13mol/L is added to react with the palladium-containing silver alloy gold; firstly, adding nitric acid with the concentration of 13mol/L to react with the palladium-containing silver alloy gold, and then mixing hydrochloric acid with the concentration of 8.8mol/L with the palladium-containing silver alloy gold; the adding together means that nitric acid with the concentration of 13mol/L and hydrochloric acid with the concentration of 8.8mol/L form aqua regia and then react with the palladium-containing silver alloy gold.
In examples 1 to 8, the influence of the standing time on the palladium precipitation effect is examined when concentrated hydrochloric acid is added and concentrated nitric acid is added, and the addition amount of ammonium chloride is twice that of palladium. When the standing time is 5-8 hours, the palladium in the aqua regia reacts with ammonium chloride to generate PdCl and Pd (NH3)2Cl2Yet another part of the aqua regia does not produce all Pd (NH3)4Cl2Precipitation can affect the subsequent product quality; when the standing time is 12 hours, the palladium content in the aqua regia is obviously reduced, and the palladium in the aqua regia is basically completely precipitated to separate out the aqua regia. Thus, the ammonium chloride palladium removal standing time isOver 12 hours.
In examples 5 to 14, the influence of the addition amount of ammonium chloride and the effect of palladium precipitation when the standing time is 12 hours or more by adding concentrated hydrochloric acid and then adding concentrated nitric acid is examined. The solid-to-solid ratio of ammonium chloride to palladium of examples 5 to 8 was 2:1, the solid-to-solid ratio of ammonium chloride to palladium of examples 9 to 11 was 1.5:1, and the solid-to-solid ratio of ammonium chloride to palladium of examples 12 to 14 was 2.5:1, and it can be seen from the table that when the solid-to-solid ratio of ammonium chloride to palladium was 1.5:1, the amount of palladium precipitation decreased, the palladium content in the final product increased, and when the solid-to-solid ratio of ammonium chloride to palladium was 2:1 and 2.5:1, the palladium content in the final product was almost the same.
In examples 15 to 16, when the standing time is 12 hours, the method is considered to firstly add concentrated nitric acid, then add concentrated hydrochloric acid, and precipitate and separate ammonium chloride and palladium, and the content of gold and palladium in the synthesized material after palladium precipitation obviously exceeds the standard.
In examples 17 to 18, when the standing time was 12 hours, the influence of the effect of adding concentrated nitric acid and concentrated hydrochloric acid together with the precipitation of palladium was examined. When the concentrated hydrochloric acid and the concentrated nitric acid are added together, aqua regia can be formed quickly, a large amount of yellow smoke (nitrogen oxide) is emitted, the reaction kettle is emitted, air pollution of a working environment is formed, the phenomenon that the reaction is too quick in serious cases can occur, the aqua regia emits out of the reaction kettle, personnel are injured, gold liquid is lost, the mode is dangerous and not advisable, and the content of gold and palladium in a combined material after palladium precipitation exceeds the standard, and the requirement of a new standard cannot be met.
In summary, concentrated hydrochloric acid is added firstly, then concentrated nitric acid is added, then ammonium chloride is added, the solid-to-solid ratio of the ammonium chloride to palladium is 2-2.5: 1, the standing time is more than 12 hours, hydrochloric acid is added firstly, nitric acid is added to dissolve gold in aqua regia, ammonium chloride is added to dissolve gold in aqua regia to precipitate palladium, and the effect of precipitating and separating out palladium can reach the new standard.
Further carrying out extensive experimental demonstration
Example 19
(1) 190kg of silver alloy gold quenching beads containing 0.043% of palladium are put into a 1000L glass lining reaction kettle.
(2) Adding hydrochloric acid with the liquid-solid ratio of 3:1 and the hydrochloric acid concentration of 10.0mol/L, then adding nitric acid with the concentration of 15mol/L with the liquid-solid ratio of 0.8:1, the reaction temperature of 80 ℃, reacting for 3 hours, and then filtering to obtain silver chloride slag and aqua regia gold-dissolving liquid;
(3) injecting the aqua regia gold-dissolving solution obtained in the step (2) into a settling tank, adding ammonium chloride at room temperature, stirring and reacting for 10min, and precipitating for 12h, wherein the solid-to-solid ratio of the ammonium chloride to palladium is 2: 1; then filtering to obtain filtrate which is aqua regia gold-containing solution, wherein the filtrate contains aqua regia gold-dissolving solution with palladium content of 0.081g/L, filter cakes and precipitates are palladium precipitation slag and silver chloride slag, and the silver chloride slag is reduced by using iron powder to obtain 99.92% silver;
(4) and (4) heating the aqua regia gold-containing liquid obtained in the step (3) to 40 ℃, adding anhydrous sodium sulfite to perform potential control reduction, stopping reduction when the potential reaches 735mV, cooling, filtering, continuously recovering valuable metals from the filtrate, and obtaining reduced gold powder as a filter cake.
The reduction rate of the gold is 97 percent, and the palladium content of the gold powder after the process treatment is 0.0004 percent through the analysis and analysis, thereby meeting the requirements of new standards.
Example 20
(1) 195kg of silver alloy gold quenching beads containing 0.035% of palladium are put into a 1000L glass lining reaction kettle.
(2) Adding hydrochloric acid with the liquid-solid ratio of 3.5:1 and the hydrochloric acid concentration of 8.8mol/L, then adding nitric acid with the concentration of 13mol/L with the liquid-solid ratio of 1.3:1, the reaction temperature of 90 ℃, and the reaction time of 4h, and then filtering to obtain silver chloride slag and aqua regia gold-dissolving liquid;
(3) injecting the aqua regia gold-dissolving solution obtained in the step (2) into a settling tank, adding ammonium chloride at room temperature, stirring and reacting for 30min, and precipitating for 12h, wherein the solid-to-solid ratio of the ammonium chloride to palladium is 2.5: 1; then filtering to obtain filtrate which is aqua regia gold-containing solution, filtrate which is aqua regia gold-dissolving solution containing palladium of 0.065g/L, filter cake and precipitate which are palladium precipitation slag and silver chloride slag, wherein the silver chloride slag is reduced by iron powder to obtain 99.94% silver;
(4) and (4) heating the aqua regia gold-containing solution obtained in the step (3) to 50 ℃, adding anhydrous sodium sulfite to perform potential control reduction, stopping reduction when the potential reaches 740mV, cooling, filtering, continuously recovering valuable metals from the filtrate, and obtaining reduced gold powder as a filter cake.
The reduction rate of the gold is 96 percent, the palladium content of the gold powder after the process treatment is 0.0004 percent through the analysis, and the gold powder meets the requirements of new standards.
Example 21
(1) First, 200kg of silver alloy gold quenching beads containing 0.015% of palladium are put into a 1000L glass lining reaction kettle.
(2) Adding hydrochloric acid with the liquid-solid ratio of 3.2:1 and the hydrochloric acid concentration of 9.0mol/L, then adding nitric acid with the concentration of 14mol/L with the liquid-solid ratio of 1:1, the reaction temperature of 85 ℃, the reaction time of 3.5h, and then filtering to obtain silver chloride slag and aqua regia gold-dissolving liquid;
(3) injecting the aqua regia gold-dissolving solution obtained in the step (2) into a settling tank, adding ammonium chloride at room temperature, stirring and reacting for 20min, and precipitating for 12h, wherein the solid-to-solid ratio of the ammonium chloride to palladium is 2.2: 1; then filtering to obtain filtrate which is aqua regia gold-containing solution, filtrate which is aqua regia gold-dissolving solution containing palladium of 0.021g/L, filter cake and precipitate which are palladium precipitation slag and silver chloride slag, wherein the silver chloride slag is reduced by iron powder to obtain 99.91% silver;
(4) and (4) heating the aqua regia gold-containing liquid obtained in the step (3) to 45 ℃, adding anhydrous sodium sulfite to perform potential control reduction, stopping reduction when the potential reaches 730mV, cooling, filtering, continuously recovering valuable metals from the filtrate, and obtaining reduced gold powder as a filter cake.
The reduction rate of the gold is 96 percent, the palladium content of the gold powder after the process treatment is 0.0004 percent through the analysis, and the gold powder meets the requirements of new standards.
Claims (4)
1. A system for extracting refined gold from palladium-silver-containing alloy gold is characterized by comprising a reaction kettle, wherein the upper end of the reaction kettle is provided with a hydrochloric acid charging hole and a nitric acid charging hole, the lower end of the reaction kettle is connected with the upper end of a filter tank a through a pipeline, and the middle part of the filter tank a is provided with filter cloth;
a filtrate outlet of the filter tank a is connected with the upper end of the settling tank through a pipeline, and the upper end of the settling tank is provided with an ammonium chloride solution feed inlet; the lower end of the settling tank is connected with the upper end of the fine filter through a pipeline, and the lower end of the fine filter is connected with the upper end of the reduction kettle through a pipeline;
the upper end of the reduction kettle is provided with a reducing agent charging port; the lower end of the reduction kettle is connected with the upper end of a filter tank b through a pipeline, and filter cloth is arranged in the middle of the filter tank b;
gate valves are arranged on the feed inlet and the pipeline;
and a pump is arranged on a pipeline among the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle and the filter tank b.
2. The system for extracting and refining gold from palladium-silver alloy gold according to claim 1, wherein the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle, the filter tank b and the pipeline are made of plastic materials.
3. The system for extracting and refining gold from palladium-silver alloy gold according to claim 1, wherein the reaction kettle, the filter tank a, the settling tank, the fine filter, the reduction kettle, the filter tank b and the pipeline are made of polytetrafluoroethylene.
4. The system for extracting and refining gold from palladium-silver alloy gold according to claim 1, wherein the filter cloth is made of terylene, polytetrafluoroethylene or polypropylene.
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