nitric acid use in gold refining


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Refining Gold with Sulphuric Acid

Parting Gold-Silver Alloy with Sulphuric Acid Alloys of 10 grains of gold, assaying 9992, were taken, and alloyed with 10, 15, 20 grains of fine silver respectively. Each alloy was rolled out in the same manner as was adoped for the nitric acid parting; 20cc of strong sulphuric, 92 per cent., acid was used in each case, and the cornets were ...

Dummies Guide to EASY silver bullion refining at home as a ...

Feb 18, 2012· The nitric acid is used to dissolve the silver and any other contaminating metals in the silver such as copper, etc. We need to eventually remove the contaminants leaving behind pure silver for final processing. ... In all the years that I've been refining silver and gold for a hobby and using nitric acid, not once has there been an issue or ...


recovery of gold,silver and platinum group metals (it is best to recover platinum group metals in a cls electrolitic tank) refining silver. if you need supplies go to our store enter the store ... to drop the silver out of the nitric acid use common uniodized table salt.

Dummies Guide to GOLD bullion refining at home as a long ...

Feb 24, 2012· Dummies Guide to GOLD bullion refining at home as a long term precious metal investment - made EASY page: 1. 162 2 3 4 >> log in. join. share: tauristercus ... So it is with the acids used in silver and gold refining ... care and common sense. ... 1. place the scrap gold into nitric acid to dissolve all other metal "impurities"

How to refine gold without hydrochloric acid - Quora

Feb 03, 2018· Actually hydrochloric acid by itself does nothing itself to help refine gold. It is a good cleaning agent to remove residue from the surface of gold particles allowing them to be more easily amalgamated with mercury, but white vinegar works nearly...

Scrap Gold Recovery: Gold Refining from scrap

Apr 11, 2010· Gold Refining from scrap ... Use Home made Aqua Regis to dissolve gold by using the above nitric Acid and hydrochloric acid (muriatic used to clean concrete or in swimming pools), 2 parts Nitric Acid (HNO3 + Na SO4 +h2O) to 1 part Hydrochloric acid (HCL)

Gold parting - Wikipedia

Nitric acid was suitable for separating small quantities of gold from silver and Aqua regia used to separate small quantities of silver from gold. Aqua regia acid process is used by refiners of scrap gold used in jewelry manufacturing.

How to Refine Gold (with Pictures) - wikiHow

recovery and refining with just nitric acid substitute. ... the answer is simple, nitric acid or our nitric substitute acid will desolve all metals except for gold. some platinum group metals (platinum,rhodium,etc) may not desolve. ... without heating the bath it will take 3 to 10 days for the acid to desolve all the non-gold metals.

How to Refine Gold in the Fire | eHow

How to Refine Gold in the Fire. There are two main sources for gold: mining and scrap. As gold prices go up, gold recycling becomes more attractive. But different pieces of recycled gold vary in the amount of gold they actually contain. Gold can be mixed with other metals like copper, which is used in red gold, or mercury, which is used in dental...

Inquartation and Parting Refining Process - Ganoksin ...

Inquartation and Parting. The technique mirrors part of the Fire Assay process used in the analysis (assay) of gold. Inquartation involves initially diluting the gold in the refinable material to about 25% (literally 'quartering' the gold) by melting with the appropriate addition of copper or silver, granulating the melt so as to generate a high surface area and then treating with nitric acid.

Silver refining - Alternative to nitric acid? : Silverbugs

Hi guys, Recently I got into silver refining using nitric acid prior to melting, which worked great and resulted in 95-98% pure silver. However recently in my country nitric acid (among many other chemicals) has been banned for personal use and have become next to impossible to get your hands on.

Hydrochloric acid - GoldRefiningWiki

You can improve Gold Refining Wiki by expanding it. Hydrochloric acid (HCl) is a strong mineral acid. It is probably the acid that is used the most by refiners. ... The classical formula is three parts HCl and one part HNO 3, but often a mixture with less nitric is used an excess of hydrochloric acid doesn't affect precipitation of gold ...

An Explanation of Assay Acids - MGS Precious Metals Blog

Jul 31, 2013· Nitric acid is powerful stuff and it will quickly dissolve other metals that are commonly alloyed with gold. Gold testing kits usually come with four different bottles of acid at different potencies – one each for testing 10k, 14k, 18k, and 22k gold. To conduct an acid test, the piece of gold in question is scraped against a touchstone.

Sulfuric acid - GoldRefiningWiki

You can improve Gold Refining Wiki by expanding it. Sulfuric acid (also spelled sulphuric acid or in old texts as oil of vitriol) is one of the strong mineral acids and has a number of practical uses in refining. ... Making nitric acid . Sulfuric acid can be used for making "homemade nitric acid". The principle is that mixing sulfuric acid with ...

How To Use Mercury To Recover Gold

How To Use Mercury To Recover Gold. View Larger Image; Forever and ever, mercury has been used to recover gold, fine gold in particular. When ... Bathe the concentrates in a 10 to 1 solution of nitric acid – meaning 10 parts of water to 1 part of nitric acid. Use a glass jar or beaker. CAUTION!

How to Refine Gold by the Acid Method -

How to Refine Gold by the Aqua Regia Acid Method. ... If you're using a nitric acid substitute: add 120 ml of hydrochloric (or muriatic) acid to the container, along with your substitute reagent. The MX3 will not have any effect until this acid is added. ... There are many different selective precipitants that can be used when refining gold ...

Refining Electronic Scrap---- Can't get nitric acid any more

Refining Electronic Scrap---- Can't get nitric acid any more. A discussion started in 2006 but continuing through 2018. 2006. Q. I've been working electronic scrap for over 20 years now as a hobby. I used nitric and distilled water to get rid of most base metals and then refined with aqua regia as normal.

How to Refine Gold: 2 Major Techniques of Gold Refining ...

Two (2) major techniques for refining gold. Generally, gold can be refined using these two-best-known gold-refining procedures: Aqua Regia and gold electrolysis. Both of these techniques can be used to separate gold from other metals. This is because a little piece of other metals in gold can change its properties and value.

Gold Parting using Nitric Acid

When the proportion, 1:2½, is parted, the resulting gold is left as a porous sponge, if dilute acid is used for the first treatment. Silver is not essential as an alloying metal, for other metals soluble in nitric acid may be used. However, if silver contains even […]

Gold Refining Forum -

Apr 29, 2007· 1. AR= Aqua Regia = 1 part 70% Nitric Acid, 3 parts Muriatic Acid (some guys use 4 parts muriatic). Used to dissolve high karat gold, gold powder, gold foils, dissolves Platinum when hot. Excess nitric must be neutralized with Urea to pH 1 +/- 0.4, then drop gold with SMB. o Hoke states 4 fluid ounces HCl + 1 fluid ounce HNO3 dissolves 1 troy ounce

Gold Refining | eBay

1/4lb bottle nitric acid substitute for aqua regia gold refining only. This is mixed with hydrochloric 2-1/2 tablespoons to 90ml or 2-1/2 tablespoons to 120ml muriatic acid instead of nitric acid and ...

Denoxing - GoldRefiningWiki

When gold is precipitated it will redissolve from the extra nitric acid, using up the nitric acid left in solution. When the nitric is gone the gold will drop as normal. This will use up more chemicals than the gold button or evaporation does but it's a quick way to solve the problem when there's only a small excess of nitric.

What Happens When You Put Gold in Muriatic Acid? | Sciencing

Mar 13, 2018· Gold is probably the most treasured of the so-called precious metals, having been used in art and jewelry for centuries and more recently finding applications in medicine, coins and elsewhere. Muriatic acid, better known today as hydrochloric acid, is a simple, corrosive liquid with well-studied chemical properties. ...

Gold Recovery Correctly: 12 Steps -

The link that the fella recommended to the gold refining forum really is one of the best I've been to. The guys on that forum won't guide you wrong and refine gold for a living! ... but the acid peroxide, or copper 2 chloride, that you used is mainly for gold fingers. ... Before you do ANYTHING with nitric acid, please consult the forum, read ...

Nitric Acid: Lab Chemicals | eBay

Find great deals on eBay for Nitric Acid in Lab Chemicals. Shop with confidence. Find great deals on eBay for Nitric Acid in Lab Chemicals. ... 6-PAK EISEN SWISS Nitric Acid 70% ACS Reagent Gold Refining 6 Safety Bottles. COMPARE - BEST PRICE ON EBAY - STOCK UP WHILE YOU CAN. $175.00. Buy It Now. Free Shipping.

Silver refining - Alternative to nitric acid? : Silverbugs

Recently I got into silver refining using nitric acid prior to melting, which worked great and resulted in 95-98% pure silver. However recently in my country nitric acid (among many other chemicals) has been banned for personal use and have become next to impossible to get your hands on.

How to Prepare Aqua Regia Acid Solution - ThoughtCo

May 23, 2019· Aqua regia is an extremely corrosive mixture of nitric and hydrochloric acid, used as an etchant, for some analytical chemistry procedures, and to refine gold.Aqua regia dissolves gold, platinum, and palladium, but not the other noble metals.Here's what you need to know to prepare aqua regia and use it safely.

Gold Refining • V

Dilute HNO3=Dilute Nitric Acid= 1 part water, 1 part 70% Nitric Acid. Used to inquart, dissolve base metals, dissolves palladium, and dissolves silver. Silver nitrate will stain skin blue which turns black in sunlight. Skin remains black for nearly 1 week. Hoke states 4-6 pounds of concentrated nitric acid dissolves 1 pound of base metals. 5

: nitric acid

"nitric acid for gold refining" Urea Fertilizer 46-0-0 Prilled Aqua Regia Gold Refining"Greenway Biotech Brand" 5 Pounds. 4.7 out of 5 stars 36. $17.99 $ 17. 99. Best Seller in Jewelry Gold Testers. Acid Test Kit Gold 10K 14K 18K 22K Silver Platinum Testing Stone Jewelers Tool. 4.3 out of 5 stars 621.

How to Refine Gold with Urea - Greenway Biotech, Inc.

May 23, 2015· So, if you're refining 5 ounces of gold, you will need a 1500-milliliter container or about 1 ½ quarts. Add 30 milliliters of nitric acid for every ounce of gold. So, if you're refining 5 ounces of gold, you would need to add 150 milliliters to the container. Allow the gold to sit in the nitric acid …