We are one of the trusted companies in India, which is manufacture and exporter of Automatic Aqua Regia Gold Refining Plant. The Gold Refining Plant offered by us are manufactured in compliance with international quality standards.
With the inclusion of advanced knowledge and innovative machines in all our processes, we are engaged in manufacturing and supplying a broad assortment of Automatic Gold Refining Machine. It is mainly used by goldsmith. Our system is safe as well as reliable in refining and extracting pure gold.
Our automatic gold refining plant is designed utilizing high grade material, procured from reliable sources of the industry and as per the defined industry norms. Our automatic gold Refining machine is mainly known for its durability and quality.
The above system is able to treat from 300 gram. to 10 kg. of raw material. You are able to produce 99.99% pure gold (Au) in a single step within a production cycle that can last from 5 to 8 hours, from the preparation of the grains, to obtaining the pure ingot.
The treatment takes place by dissolving the raw metal alloy through the use of the so-called “Aqua Regia” process, an opportunely calibrated mixture of hydrochloric acid (HCl) and nitric acid (HNO3).
The Aqua Regia Process
Our system work on the basis of Aqua Regia Process. In Aqua regia process the Gold (AU) should not be less than 65% and Silver (AG) should not be more than 10%.
The process involves to dissolve gold in Aqua regia ( Acid+Water Mixture ).Silver will form Silver chloride precipitates, which will be filtered out.
The filtered solution is treated with a Reducing agent Sodium Meta Bisulfite, and precipitates Gold, which is filtered, washed , dried and usually melted and granulated.
Inquartation Procedure
The most used refining technique is based on chemical method whereby the gold- bearing scrap is dissolved in aqua regia (HNO3 + HCl). The aqua regia refining technique efficiently works with alloys that respect the contents of silver less then 10%.
The silver percentage in the alloy represents a critical value to be considered in order to use the aqua regia refining technique.
A high silver concentration, indeed, may block the reaction due to the exceeded amount of AgCl formed during the chemical attack.
An alternative method for gold refining applied to high silver content alloys is the “inquartation procedure. 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, then treating with nitric acid.
The acid will dissolve the silver and base metals, leaving behind the gold. The acid treatment is known as parting as it ‘parts’ (separates) the gold from the silver and base metals.
Dilution of the gold content is necessary to ensure that the nitric acid can readily attack and dissolve the base metals and silver, some of which may be otherwise masked by the gold.
Four Simple Steps To Get Pure Gold
Dissolution: Acids react with gold, silver, copper and other alloy constituents to form gold chloride solution, silver chloride precipitate and copper nitrate solution.
Filtration: Silver chloride precipitate and insoluble matter is separated from solution containing dissolved gold and copper.
Reduction: Gold reagent, added to solution, reduces gold chloride to pure gold oxide precipitate.
Washing: Gold oxide is removed from the remaining solution containing dissolved copper, is chemically washed and dried. You can now melt the gold powder and re-use as required.
Automatic Gold Refinery Plant Includes
- Dissolution Reactor
- Precipitation Reactor
- Gold Filtration Unit
- Glass Coolers For Acid Flumes
- PTFE Agitator Assembly
- Hno3/ HCL Acid Charging System
- Flange & PTFE Gasket and SS Nut bolts
- Scrubber Nitrous Fumes Neutralization With Tank & Pump
- Glass Washing Scrubber For Fumes
- Electrical Panel With VFD / On Off Switches
- Platinum Reactor
