gold refining forum view topic borax

How to Melt Gold Out of Rocks | Sciencing

It's common practice to add a flux, such as borax, to the gold to lower the melting point and make the process more efficient. Processors form gold recovered in this way, which may be mixed with silver and other metals with a lower melting point, into low-quality doré bars, which must be refined further to get pure gold.

borax mining plants

Borax Argentina Orocobre : Orocobre. Borax Argentina has operated in the Salta-Jujuy region for over 50 years. Its' operations, include open pit mines, concentrators, refining & land holdings. Inquire Now; The Science Spot. Welcome to the Science Spot, your source for free lessons, activities, and resources for middle school teachers!

Melting gold concentrate without flux - Pyrometallurgy ...

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Gold Smelting & Refining Process

The flux is a mixture of several reagent chemical such as borax, silica, sodium nitrate, sodium carbonate and fluorspar. Borax is a white crystalline mineral used in glass and ceramic enamel mixes. In the smelting process, borax helps to reduce the gold smelting point of the charge and capture metallic oxides. The addition of this reagent must ...

Laboratory Testing & General Mineral Processing Engineering

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Optimal Metallurgical Flux Recipe for Primary Refining of ...

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Refining of an alloy of gold and silver - Pyrometallurgy ...

Hi, everybodyI want to separate an alloy of gold and silver with gold content between 25% and 92% Au.As you know, in the alloy of gold and silver with gold content of less than 25%, Ag can be dissolved with sulfuric Acid or Nitric Acid.In the alloy of gold and silver with gold content of more than 9

Gold Refining Forum.com

Dec 24, 2019· 4metals wrote:I was able to take 100 grams of powder ground and ball milled from this type material and using the identical flux ratio he used and end up after the fusion with a lead cone from a reasonably fluid flux, no noticeable beads were clinging to the crucible after the fusion.Which in an assay fusion are easy to see while the crucible is still red hot after the pour.

Using Borax Flux to Refine Gold - Manhattan Gold & Silver

Aug 07, 2013· But at Manhattan Gold & Silver, we think about gold refining. That's because this mineral does more than wash clothes – it's an important flux in metallurgy for separating gold from slag. You've probably seen borax in the detergent aisle, but it has several uses spanning multiple industries.

Method of Gold Extraction using Borax -Small Scale Miners ...

The Gravity-Borax Method GBM is still unknown to most Artisanal and small-scale gold miners (ASGMs) worldwide as most still use mercury to extract gold. "Whole-ore amalgamation" is a technique that requires the use of 10–25 g of mercury to produce 1 g of gold.Within the last eight years, it has become evident that this technique is more widely used than earlier anticipated, and artisanal ...

How To Make Flux For Gold Refining - turismovalformazza.it

Flux for gold melting??? Gold Refining Forum. · Pescador7, Flux is a broad term used for ingredients used to change the characteristics of the melt, these can be physical and stone changes, there are also quite a few different things which are used to make up a flux recipe, some of these are many times normal ingredients, then there are also some that are added to change the ...

Anyone know anything about refining .925 and .900 silver ...

Aug 03, 2012· 90% silver U.S. coinage is legal to melt, refineries around the world do it every day. There use to be a poster on the PM forum ATS who was melting, refining, and selling small silver bars.

Borax method - Wikipedia

The borax method is a technique of artisanal gold mining, which uses borax as a flux to purify gold concentrates. By using borax, no mercury flour is produced, hence gold recovery increases. [1] [2]

Gold-Silver Forums

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Gold processing - Refining | Britannica

Gold processing - Gold processing - Refining: Gold extracted by amalgamation or cyanidation contains a variety of impurities, including zinc, copper, silver, and iron. Two methods are commonly employed for purification: the Miller process and the Wohlwill process. The Miller process is based on the fact that virtually all the impurities present in gold combine with gaseous chlorine more ...

sodium metaborate instead of borax (Page 2) / General Chat ...

Dec 21, 2019· when doing the job and with gold and borax I just use about 1/4 teaspoon at most to 65grams of clean gold/nuggets. if melting in a porcelain type dish whenyou have the gold and borax all molten just use a graphite rod, or (welding rod) as it is starting to cool push the glass around a bit and away from the gold, keep using the flame when ...

effect of borax during smelting - Pyrometallurgy: Roasting ...

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Kitco Forums

Jun 14, 2020· The Kitco Forums - A community of investors focused on gold, silver, metals, mining & financial discussion, containing a wealth of user-generated information & knowledge, which has now expanded to include stocks, forex & bitcoin markets!

Melting Gold In A Potato? - Forums - Arizona Outback's ...

Oct 01, 2007· The borax will pull out the impurities and host rock leaving a clean chunk of gold. Take an acetylene torch and slowly start heating the material. I usually start 6-8 inches away and move closer as the borax starts flowing as to not blow it out of the potato.

Refining | industrial process | Britannica

Other articles where Refining is discussed: metallurgy: Extractive metallurgy: Extraction is often followed by refining, in which the level of impurities is brought lower or controlled by pyrometallurgical, electrolytic, or chemical means. Pyrometallurgical refining usually consists of the oxidizing of impurities in a high-temperature liquid bath.

Recovery of gold from polishing dust, sweeps floor or dirt ...

2006. A. Precious metal refining can be an exceptionally complex operation, Joseph, not something easily dispatched with an internet posting of a couple of paragraphs. I was recently involved in assessing some fire damage to a good size precious metal refinery and the cost of the repairs to about one quarter of the refinery was, as I recall, about 30 million dollars.

Extremely Fine Gold Recovery - ICMJ's Mining Journal Forums

Apr 14, 2015· Hi all. Im new here on the forums and to ICMJ in general. I am not new to mining having had an exposure all my life, yet until the last few years, not too actively engaged beyond small recreational placer efforts. I am the inventor of the Gold Well vortex drop riffle sluice, that …

Gold Extraction using borax (Page 1) / General Chat ...

Jun 29, 2014· This vid is a touch confusing as the Borax is'nt as far as I can see doing any extracting until smelting, seems to be crushed, milled, then sluiced and panned out, then Borax just added to the final concentrate for smelting. I guess in the final concentrate the Borax may help release the Gold out of the heavies better than Mercury can.

Borax ? - Gold Refining Forum.com

Dec 01, 2012· thats reagent grade borax.its bought at the chemical supply houses that other chemicals are sold. it has lower moisture and doesnt expand as badly. the super market brand works perfectly well. when applying the borax, apply to a hot, dry dish a pinch at a time around the top edge of the dish and push the melted borax to the middle with the torch flame. you only want to coat the inside of the ...

Gold Refining Forum.com

Jun 08, 2018· I have a number of used melting dishes, and crucibles, that I would like very much to clean up and reuse them. They are in good physical shape but have a heavy accumulation of slag (Borax) on them. I think I read somewhere on the forum a post by Harold how to clean a crucible or melting dish. I can't find the post.

Chemical refining gold – General Prospecting Talk – Gold ...

Then just dip a q-tip in your gold solution and put a drop of your stannous on it. It will show purple for gold, the darker the better. It looks black when your lucky. If it turns green or red you have other good news. Anhydrous Borax This is the best flux for pure gold, in a pinch though 20 mule team borax works.

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

Feb 24, 2012· With the quantity of gold in this tutorial, using the plastic pipette, I added 5 drops of nitric and 15 drops of hydrochloric making a 1:3 mixture of Aqua Regia. Immediately the gold starts to dissolve and the liquid starts to bubble and turn a nice yellow colour. This is a good sign that almost all contaminants have been removed previously.

How to Melt Gold With Borax | Sciencing

Prepare to melt the gold. Sprinkle a little borax onto your gold piece. Increase the amount of heat on the torch until the gold starts to melt. It should look bright orange with a green tint as it nears its melting point. All the fine particles of gold will melt together into a bright ball.

Refining For Jewelers - Hoover and Strong

Refining For Jewelers. World's Greenest Refiner! We offer FREE Refining, FREE Shipping, Gold Up to 99% and 24 Hour Settlements! Payment options available include gold or silver bullion and coins, cash or credit towards purchase.

Refining Gold | Sciencing

Gold usually exists in nature in combination with other rocks and minerals. Some of these, such as silver and copper, may also be precious or semi-precious, but a variety of base metals are usually also present. Though several different techniques exist, any process used to separate metal from impurities or …

Removing Gold From Borax - Gold Refining Forum.com

Jan 30, 2011· Break up your flux so the pieces are small enough to react with a few more ingredients you will be adding in the old flux and do a flux melt. To the borax add some soda ash equal to the amount of crushed up old borax you have started with, add an equal amount of Borax (always use anhydrous) and about 1/4 part flourospar (calcium flouride) this will really thin the flux.

Removing borax from gold - The Science and Philosophy Forum

Jun 10, 2016· Print view; Please login or register in order to gain full user access to the forums ... 3 posts • Page 1 of 1. Removing borax from gold. by ajsammut on December 27th, 2015, 7:46 am I need to remove borax coating with a piece of gold. What is the optimum concentration of sulfuric acid to use? ... The Science and Philosophy Forum is aimed at ...

Tanaka Refinery - Gold University - BullionStar

Introduction. The Tanaka Kikinzoku Group is a Japanese group of specialist precious metals companies held under umbrella holding company Tanaka Holdings Co Ltd. Tanaka is central to the Japanese Gold Market, as it is the country's largest gold and platinum group metals refiner, and the biggest producer of gold bars in Japan.. The group's Tanaka Kikinzoku Kogyo company trades, refines and ...