SUNDER RAJU: EXTRACTION METHODS TO DETERMINE GOLD IN GEOLOGICAL SAMPLES 67 sulphides, silicates and carbonates). Iron interfering with gold wavelength during analysis was overcome by back extraction of iron from the organic extract. Centrifugation of colloidal materials in the organic phase also affects aspiration of solutions in F-AAS. Based on the analysis of acid sensitivity of the Si–Cu alloy phase, it was found that aqua regia was an effective leaching agent for removing the Si–Cu alloy phases from Si grains compared to HCl and HNO 3. Addition of copper resulted in the increase in the extraction yield of boron and phosphorus from MG-Si from 21.0 to 58.7% and 23.2 to 42.2%, respectively. Mar 05, 2017 Convert lbs to kg: lbs x 0.454 = kg; Calculate to find mg: kg X ppm (or mg/kg) = mg; Juliet M. Getty, PhD, is an internationally respected, independent equine nutritionist who believes that optimizing horse health comes from understanding how the horse’s physiology and instincts determine the correct feeding and nutrition practices.
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A discussion started in2003 but continuing through 2019
June 21, 2014
Q. Hello sir, myself Vivek. Sir, if we add sodium formate in aqua regia on hot plate, palladium is precipitated or not? Sir please help me.
vivek vigshri krishna metal refining - jagadhri haryana June 24, 2014
A. You'll have to eliminate the nitric acid from the Pd aqua regia solution before precipitating the red Pd salt with Chris Owen- Nevada, Missouri, USA June 25, 2014
A. Vivek, Chris OwenI apologize. I thought you said sodium chlorate instead of sodium formate. Using sodium chlorate is the most common way of dropping Pd. I haven't used sodium formate, but I would think you would still have to remove the nitric first. I may be wrong. - Nevada, Missouri, USA July 18, 2015
A. Dear vivek Vig, bhupesh mulikPalladium dissolves in nitric acid, no need of aqua regia. cac admixtures - mumbai,india August 17, 2014
Q. Anyone tell me that how can I separate palladium from liquid? And what chemical I use?
Muhammad Yaseen- karachi,sindh,pakistan October 5, 2014
A. Wheelhouse dmg geekwire seattle best work. Use dimethyl glyoxime or hypophospurus acid for palladium precipitation.
bhupesh mulikmumbai, maharashtra, india October 7, 2014
Q. I have metal mixture of palladium silver and copper. How to recover these metals separately? Please guide me.
mehtab ali- ahmedabad, gujarat, india October 2014
adv.
Refining Precious Metal Wastes by Hoke from Abe Books or
adv.
'Recovery And Refining Of Precious Metals' by C.W. Ammen from Abe Books or info on Amazon
? Hi Mehtab. Can you please try your best to phrase your question in terms of the answers already provided? I don't know much about that subject, but it looks like you are re-asking a question that has already been repeatedly answered in pretty good detail more than half a dozen times already. Please try to tell us what you are not understanding. Thanks.
Regards,
Ted Mooney, P.E. finishing.com - Pine Beach, New Jersey Striving to live Aloha November 23, 2014
A. Hi mehtab. bhupesh mulikYou have a metal mixture of palladium (Pd), copper (Cu) & silver (Ag). All these dissolve in nitric acid, so dissolve it in nitric acid and then recover it from liquid giving preference to which metal is more in your mixture. - mumbai,india June 10, 2015
Q. I have a colloid solution red in colour with platinum nanoparticles in it at 40%. I want to get the platinum out; I need an answer in laymans terms -- some say it's not complicated, others say its dangerous. Help is needed please.
shaun claremont- croydon, surrey, england July 18, 2015
A. Dear shaun, bhupesh mulikIf possible, you first concentrate your red colour solution nearly half in quantity by volume. Check the pH, add slowly saturated solution of ammonium chloride in it. You will get yellow precipitate of platinum sponge. cac admixtures - mumbai,india July 23, 2015
Q. Hi, thanks. When you say concentrate I assume you mean heat it up so some of it boils away -- how do I find the pH of what's left? This yellow sponge. Do I then heat this up and turn it into a platinum ingot
shaun claremont [returning]- croydon, surrey, england July 26, 2015
A. Dear Shaun, bhupesh mulikYou have a solution which contains Pt. You heat this solution nearly half meaning if you have 4 liter solution, concentrate by boiling & make up to 2 liters. Then using ph paper sheet you check whether pH is acidic or not. Then add ammonium chloride in it to get yellow precipitate of platinum sponge. cac admixture - mumbai,india July 27, 2015
Q. Hi bhupesh, thanks. Great. Now I have a platinum sponge can I put this in a crucible and melt it into a button?
shaun claremont [returning]- Bletchingley, surrey, england July 31, 2015
A. Dear shaun, bhupesh mulikPut all the yellow ppt in porcelain crucible; burn it at around 850 to 900 °C. It becomes like a gray ash. Then melt that gray powder in ceramic crucible at around 1850-1900 °C; you will get pure platinum. cac admixture - mumbai,india August 10, 2015
Hi bhupesh, Shaun Claremont [returning]Thanks for all your help; now going to try -- let's see what happens. - Bletchingley, surrey, england Making Palladium ChlorideJune 18, 2015
Hi. Please anyone tell me how I can prepare palladium chloride from palladium metal for catalyst. 99.99% purity.
shruti patelbusiness - rajkot, gujrat, india
adv. July 13, 2016
Platinum-Group Elements; Mineralogy, Geology, Recovery from Abe Books or
Q. I have platinum soil mixed with copper dust; I'd like to know what method or acids must I use to separate these two?
joseph Ramphomane- Johannesburg, South Africa April 1, 2018
Q. I was having some amount of palladium on carbon 10% powder and I wanted to take palladium out of carbon powder so I made aqua Regia solution with HCl and HNO3 at ratio of 3:1 and put the palladium carbon powder in my aqua Regia solution and boiled it for 30 mins and more and after filtration I got very dark brown or dark red solution and I tried to precipitate palladium with the help of sodium metabisulphite, but it doesn't work and my solution is still in same color and it's been 2 days I have kept it in a borosil beaker. Imran ChoudharySo please anyone experience person who can suggest me that how can I precipitate palladium out of my aqua Regia solution with which other types of chemicals and how? Please anyone help me, your kind suggestions will be appreciated by my side. Thanks and regards Choudhary Traders - Mumbai, India July 31, 2018
A. Hi Imran, Bhupesh MulikI have an answer to your questions. You can use DMG or H3PO4 to precipitate palladium. CAC admixtures - Mumbai,india January 7, 2019
Q. Hi my name is Mark; I'm a small miner in Arizona and have achieved a separation of palladium and have converted it to palladium oxide at 1800 °F and now I'm trying to smelt in my induction furnace but cannot achieve above 400 °F with the oxide. The induction furnace will achieve 3800 °F according to manufacturer. I've seen the process done on youtube but they don't show how they started the melting process, just kept adding more oxide into the melt. Does anyone have knowledge of why the furnace is not harmonized for the oxide?
Mark Spradling- Gilbert Arizona USA February 8, 2019
A. Hi, mark, Bhupesh Chandrakant Mulikfor melting palladium sponge you have to add a small amount of palladium metal before melting process, then slowly add your palladium sponge. Thanks, Dmg Phase Separation Awua Regia 3CAC admixtures - Mumbai,indiaJune 3, 2019
Q. Dear Sirs, Kelvin ChingI have palladium-nickel alloy rejects from which we wish to reclaim the palladium with chemical precipitation. Could you kindly advise. Thank you. - Bangkok, Thailand June 6, 2019
Q. I have PT-PD alloy of prop. 925-75. To recover both metals I am doing aqua regia and then concentrating with HCl to remove nitric, then adding ammonium chloride to precipitate platinum sponge. Then calcining the sponge and melting.
The final metal consists 0.25% PD. what can I do to remove this content at initial stage? Dmg Phase Separation Awua Regia DeArmaan Joshi- Mumbai,Maharashtra , India June 19, 2019
A. Hi armaan, Bhupesh Chandrakant MulikHow did you detect 0.25% Pd still remains? Which assay did you do? Pd ppt using DMG complex formation. Thanks Liquid Phase SeparationCAC admixtures - MUMBAI,indiaJune 28, 2019
Q. Hi Bhupesh, Armaan Joshi [returning]I do XRF to check the same. I doubt if ammonium chloride is precipitating some palladium or XRF is interpreting something false. From my PT-PD mix dust I have to refine 3 times to get pure PT because every time I get a small proportion of PD in refined PT. Dmg Phase Separation Aqua Regia 2- Mumbai,Maharashtra, IndiaPhase Separation Definition
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