We are manufacturer of precious refining plant and supplier of this product in India and all over the world. Being one of the leading manufacturer and exporter of precious Metal Refining machines, we have a huge vendor base who supply high quality raw material for the manufacture of these products.
Keeping in mind the needs and specifications of our clients, we also offer a wide range of these products in various customized forms.
We are widely appreciated by our clients for the prompt deliveries and accuracy of our products. We also help our clients to setup in-house department with proper laboratory layouts.
Precious Metal Refining Machine helps to refine the gold in order to ensure its alluring finish. Refinery plant provided by us is highly acclaimed by the end-users for its excellent performance, low maintenance, optimum efficiency, convenient installation & operations, longer service life and flawlessness.
Our precious metal refining plant are designed to yield 99.99% pure gold.
Introduction to Precious Metal Refining Plant
We believes that mastery over jewellery craftsmanship is incomplete, without your total control over the caratage of your gold/silver. Our complete in-house precious metal refining systems, provide you full control over this primary and crucial process. In-fact, it is the first step to the perfection of your glittering end products.
Precious metal refining plant are ideal for old gold/silver jewellery buyers, bullion suppliers, gold smithies, jewellery casting and chain manufacturing factories, job-work refineries etc., as they come in various capacities, to suit small or larger refining needs of the jewellery trade.
Series of precious metal refining plant are among the most advanced in-house refining systems available,with special features not found in other refiners.
Jewelers worldwide and in India, have understood the many advantages of in-house refining and are appreciating the profits, by savings, otherwise not achieved due to low yields and/ or purity, idle storage of refinable gold, high refining charges, etc.
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.
Process Advantages
- The process is very simple and is backup with unique refining process.
- With our system you can yields virtually 100% of your gold and purity up-to 99.99% can be achieved.
- Absolutely no silver addition is necessary.
- Silver and copper in your gold alloy can be recoverable.
- Low consumption of Hydrochloric (HCL) acid and Nitric Acid (HNO3).
- With our refinery system you can refine carat gold such as old gold jewellery, gold scrap etc.
- Our system is very efficient in recovering gold from from low grade gold wastes such as floor sweeps, buffing rouge powder, filings, grindings, polishing, wash slurry, crucible powder, etc.
Electrolytic refining process disadvantages, such as inconsistent yields and purity, very slow refining speed, only part recovery per batch, only refines carat gold, very expensive inputs per gram of refining etc, such issues do not arise here with our system.
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.
