rhodium black 75% refining,parting with silver

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vinod patel

Member
Joined
Jul 17, 2012
Messages
14
hi friend, rhodium extrct from reject plating solution is a black form- if we have 1 grams black rhodium 75% it mix with 15 grams of 999% silver metal and melting it ,when alloyed complite-it poured in water bath with stairng to make alloyed in small piecs- all it when cool collect and dissolved it in nitric acid 67% 30 ml and 30 ml of water with boilig in borosilicate bicker of 200 ml it capacity. if all silver dissolved- and a gray rhodium particals are seen in it washed with 5 to 8 time with 100ml of water -to wash out all the silve nitrate which next added in iodin free sodium chloride to convert the silver in to chloride and silver chloride prcipetated with 5ml of dilute hydrochloride and iron plate with ocasnelly stairing in it so silver metel is recoverd. - now take the gray rhodium added in 3ml of nitric acid 3ml of water and 12 ml of hydrochloric acid and put aside for 24 hours and then pour off the acid and wash with 5time with 100 ml of water ,and dry and weight of 96% pure rhodium.====================================================================== so many people above theory is used for gold refinig but they are take only 2 grams of silver and 1gram of impure gold , but actully it not aperfact refining theory- beacouse at this time science devloped very well and gold alloyed contain so much impurity have present which is not dissolvd out by only nitric acid tretment-and such impurity next melting with gold and gold 24 karate colour do not changed this kind of impurity-like iridium,ruthanium and osmium!!!!!???? and it weight as 24 karat gold - and this is problamatic when jewllery made with it jewllery not take up it high polish and so much small pimpel out from the surfase of the jewllery and they are face the problam and re refine all all it product! so aqua rejia prociger is the best for refining. your friend , vinod patel.
 
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