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Silver Electrolytic Refining Equipment
High-efficiency silver electrolytic refining equipment is a machine that refines crude silver (containing more than 97% silver) to 99.99% silver through electrolysis. Crude silver plate is used as anodes, titanium sheet is used as cathode, and silver nitrate is used as electrolyte. And direct current is passed through the electrolytic cell. Through electrolysis process, the coarse silver is dissolved at the anode and pure silver is precipitated at the cathode, thereby achieving the purification effect.
Product Description
Silver electrolytic refining equipment specializes in the processing of various silver-containing raw materials. The raw materials include gold-silver alloys obtained by fire treatment of copper and lead anode mud (silver content is more than 95%), and crude silver obtained by wet treatment of anode mud. The gold content in these raw materials does not exceed one third. If the gold content is too high, in order to prevent anode passivation during electrolysis, need do add silver. During electrolysis, gold and silver alloys are used as anodes, silver sheets, stainless steel or titanium sheets are used as cathodes, and aqueous solutions of nitric acid and silver nitrate are used as electrolytes. And direct current is passed through the electrolytic cell. Through electrolysis process, the base metal impurities, gold and platinum group metals in the alloy can be separated from silver. And silver powder can be precipitated at the cathode.
Raw Material
Silver electrolytic refining equipment can be used for various surface silver raw materials, such as crude silver, silver jewelry, silver plates, silver ingots, etc.
Silver Ingot
Silver Plates
Crude Silver
Silver Plates
Final Product
The final product from the silver electrolytic refining equipment is high purity silver, normal is 99.9%, if you have higher require, also can do 99.99% or 99.9999%
Silver
Silver Plates
Crude Silver
Silver Plates
Flow Chart
1. Casting silver anode plate: the silver electrolytic process requires that the coarse silver is cast into the anode plate, and the cast silver anode plate is inserted into the silver automatic electrolytic equipment for the subsequent electrolytic process. Therefore, before raw silver enters the electrolytic process, the anode plate casting process must be carried out.
2. Preparation of silver electrolyte and recovery of waste electrolyte: the process of making silver nitrate solution and mixing silver and nitric acid in water is called liquid making. The liquid can be prepared by reaction of pure silver with nitric acid. The reaction equation of silver and nitric acid is as follows:
Ag + 2 hno3 – > AgNO3 + NO2 write + H2O
When the impurity content of electrolyte is too high, sodium chloride is added to the waste electrolyte, and sodium chloride reacts with silver nitrate to form silver chloride precipitation. The resulting silver chloride is precipitated back into the silver bucket for silver precipitation, and the coarse silver obtained after filtration is carried out for melting and casting electrolysis.
3. Silver electrolysis: clean the anode rod, conductive bar, electrolytic hook surface, put in the anode plate, and then adjust the current and voltage of the silver electrolytic unit to the specified value, open the automatic scraping system, in the process of electrolysis only one person to check whether the electrolytic work is normal.
4. cleaning and drying: the electrolyzed silver is scraped out by the automatic scraper system. After the electrolyzation is finished, the material valve is opened to clean and dry the produced silver powder and cast into the required silver ingot.
5. Purifying electrolyte: Slowly stir NaOH into the waste electrolyte or silver-containing waste liquid in the silver bucket, adjust the pH, filter, obtain silver oxide reserve, waste liquid for waste liquid treatment. Add the waste electrolyte into the electrolyte purifying kettle, then slowly stir in Ag2O, adjust the pH of the electrolyte, and observe the electrolyte by sampling for several times until the
electrolyte becomes colorless and transparent. Finally, HNO3 is added to the solution, the pH is adjusted to the original pH, and the silver nitrate solution is obtained through filtration.
6. anode mud treatment: Add nitric acid to the anode mud, nitric acid can dissolve other metals except gold in the anode mud, then add NaCl to the solution, silver nitrate reaction with NaCl, generate AgCl precipitation, add iron powder to the precipitation, replace the coarse silver, and then take the coarse silver to melt cast anode plate.
Product Advantages
Advantages of the company’s efficient Silver Electrolytic Refining Equipment:
1. Using high current density electrolysis technology, the cathode current density is 750A / m2, and the production efficiency is high;
2. The quality of the product is stable, and the electrolytic silver powder can reach more than 99.99%;
3. Transparent closed flue gas cover plate, side ventilation, good working environment in the workshop;
4. An electrolyte cooling system is provided to cool the electrolyte, reduce the volatilization of the electrolyte and reduce the acid consumption;
5. A flue gas condensation system is provided to cool the flue gas to avoid silver loss;
6. The main material of the equipment is high performance polypropylene material, adding anti-aging agent to the material, which greatly prolongs the service life of the equipment. The whole bracket material is PPH, and the corrosion resistance is very strong; the cathode and anode conductive bar material is titanium clad copper, and the conductivity is excellent.
Technical Parameter
Silver Electrolytic Refining Equipment Technical Parameters
Working voltage can be customized, and if you have other requrement and want to know more details, please contact us.(The data in this table are for reference only)
Model | Capacity kg/day | Power/kw | Size(Length*Width*Height) |
SER-20 | 20kg | 5 | 1500*700*1850 |
SER-50 | 20-50kg | 10 | 1600*800*1900 |
SER-100 | 50-100kg | 15 | 570*840*1200 |
SER-200 | 100-200kg | 25 | 1200*840*1300 |
SER-300 | 200-300kg | 39 | 1930*840*1300 |
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Please specify your requirement by referring to the following aspects:
1-What kind of raw material do you want to process?
2-How many tons raw material do you want to process per day?
3-When will you want to start this project?
4-How is your budget of machine?
5-Which point that you really focus on?(We have customized service for each client)