rhodium price per kg

admin1 Precious metals 2021-03-31 11:14 0

 
   Now the introduction of the rhodium price today, the sharing of the quotation from the factory director, the risk of the silver-tin alloy coating with the amount of silver content is described in chlorine. Platform surfing. Years and months of completion, in. Here, deposition occurs from an alkaline electrolyte with pyrophosphate as a complexing agent for tin and cyanide as a complexing agent for silver. Another alkaline electrolyte based on tetravalent tin, silver nitrate and hydantoin is called the silver complexing agent Ohara. Tokyo University of Science. However, the higher silver content in the coating is undesirable for economic reasons. On the other hand, the silver content in the rhodium-gold should be advantageously weighted in order to allow the coating to be close to being welded at low temperatures, ie towards the eutectic of the rhodium-gold. In addition, due to the high toxicity of cyanide, the use of cyanide should be avoided. The following shortcomings are also related to alkaline electrolytes. Previous systems used to deposit tin-lead alloys from acidic electrolytes were not designed to treat cyanide electrolytes in terms of wastewater treatment. However, for economic reasons, it is desirable to continue to use these conventional systems to deposit tin-lead alloys to deposit rhodium-gold. In addition, the deposition rate from alkaline electrolytes is relatively low.


 
   Since tin exists in a tetravalent form in an alkaline environment, the deposition rate is reduced compared with the acidic electrolyte contained. When developing an acidic electrolyte for depositing gold with a low proportion of rhodium, the problem with silver is the large potential difference between the metal rhodium and the manufacturer of the rhodium recovery price in Zhumadian. The standard potential is that if the potential difference between the two metal rhodium is large in the electrolyte containing the two depositable metal rhodium, it is the latest domestic preference to deposit metal rhodium with a positive standard potential. This means that silver is best deposited from the electrolyte of the silver electrode. Another problem in the acid silver electrode system is that tin is a divalent form of reducing agent, which is different from the standard potential of silver. If an acidic solution is mixed with an acidic solution containing silver, it will cause the reduction of silver. The reaction is as follows It is shown that by separating finely dispersed black silver powder or precipitating black silver, the silver mirror on the wall of the reaction vessel can be identified. Another problem is the price of rhodium. The base material to be coated usually has a greater negative standard potential than silver. The basic material of electronic components is usually copper or copper alloy. The value of the standard potential. Therefore, the difference with silver is. This potential difference causes silver to be deposited on the copper surface in charge exchange. Such a reaction can impair the adhesive strength of the subsequently deposited layer. In order to successfully deposit rhodium-gold from a strongly acidic electrolyte containing divalent tin ions, it is necessary to find a suitable compound to complex the silver, thereby causing the silver to migrate. The standard potential of silver can reach more negative values. In addition, the complexing agent must be selected to act on silver sexually.


 
   If tin complexation occurs at the same time, the standard potential will also become more negative here. Change. Thereby, the original potential difference of non-complexed ions can be restored. The palladium valence patent application cited potassium iodide as a complexing agent for silver, which shifted the standard potential of silver. As a result, almost equal standard potential values ??of tin and silver are obtained. The disadvantage of using potassium iodide is that the amount of potassium iodide used is greatly excessive compared to the amount of silver to be complexed. The concentration must be, for example. Since potassium iodide is an expensive compound of rhodium at a price per gram, this method of recovering at a price per gram cannot be carried out economically. In addition, the value must be between to. If a complexing agent is present, the divalent tin is only soluble in this range. The Johnson Matthey PGM price itself causes the standard potential of tin to shift, thereby again increasing the potential difference between tin and silver. Effective complexing agents for tin are, for example, hydroxycarboxylic acids. These make the precipitation of heavy metal rhodium compounds more difficult when treating wastewater, and therefore are undesirable. In addition, the weakly acidic electrolyte value has only low conductivity. These electrolytes can only be used in so-called barrels at low cathode current densities to ampere-decimeters, that is, the method of depositing the metal rhodium layer and the recovery of the rack for how much a gram, with the usual deposition rate of up to meters per minute. They are not suitable for continuous electroplating where high-speed deposition occurs and the high cathode current density is ampere square decimeter, and the deposition rate is obtained in meters. In short, according to the amount of recycling, the current price of rhodium recycling in Zhumadian is a gram manufacturer. The one-gram method therefore has many disadvantages. Aromatic thiol compounds are described as complexing agents. For this ruthenium valence, the equilibrium resting potential of silver may be approximately shifted. Therefore, this value is sufficient to achieve the combined deposition of tin and silver and obtain a stable electrolyte. Even the thiol compound and the disulfide aromatic group derived therefrom are described as complexing agents in the cited patent applications. You can use a simple measurement table


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