gold refining systems - safe & simple - machines and equipment for gold and silver electrolytic, wohlwill and aqua regia refining, purification, processing, recovery
Traditionally, the resources necessary to refine, recycle gold, safely and effectively, have been available only to large scale jewelers and precious metal miners, refiners--seldom to small or medium-scale refineries and jewelry businesses, and never to individuals interested in buying scrap gold to turn it into a precious keepsake. That's all changed, though, thanks to Gold Refining Systems, Inc., a company devoted to helping jewelers and refiners of all sizes to refine, recover gold safely, efficiently, and with ease.
Our gold refining systems offer you what you need to refine gold of any kind-- whether its scrap gold, fine gold jewelry, karat gold, gold from mining, prospecting or gold of any other type. The system even works for other precious metals, including silver, platinum, and palladium. But what sets Gold Refining Systems, Inc. apart is our innovative technology:
For the first time ever, gold processing can be done with a high level of confidence and safety, from a very small jewelry business to medium scale refinery. The process is simple and easy. By using our REFINEIT system, all the user has to do is melt the gold in an ingot, submerge the gold in the gold refining equipment we provide, then wait. The next day, pure, 24-karat gold will be waiting!
Gold Refining Systems not only makes the gold refining, reclaiming process easy, but also clean and safe. By using our Safe Gold Refining Technology products, the jeweler or refiner eliminates the production of toxic fumes. Nothing like Aqua Regia, Miller process, inquarting - parting process, with large quantities of toxic fumes produced, toxic gases, boiling acids.
The gold refining systems we offer are cutting edge, and, unlike anything else on the market, they offer an effective alternative to commonplace refining processes like Miller, Wohlwill, Aqua Regia, and inquarting-parting. Our electrolytic machines take what is typically multi-step process dangerous process and turn it into a single-step procedure that can be done quickly, easily, and without the presence of dangerous or irritating fumes. Smelt your low karat gold, place in to the system, wash refined 24K gold, use it.
mini gold melting furnace, portable machine for silver and gold jewelry
This small gold smelting machine can in no time reach a maximum temperature of 1600. This features also makes this machine for melting other metals. Metals such as silver, copper and aluminum, just to mention a few.
Increased efficiency- The efficiency of a gold melting machine closely relates to its power requirements. The high voltage primary coil in thegold melting machineallows the furnace to heat up quickly providing higher thermal efficiency for all round melting.
Reduced cost of operation- The financial implication of running yourgold melting machinegoes hand in hand with energy efficiency. The use of ajewelry furnacereduces power consumption, therefore, saving production cost.
Improved metallurgical function- The principle behind induction melting revolves around the use of high voltage primary coil to generate an electromagnetic current that heats the metal. The induction furnace performs a function called electromagnetic stirring which causes molten metal to become even or uniform for casting.
Cleaner melting operations- The gold melting machinehas a less negative impact on the environment compared to electrical furnaces. Thisjewelry furnacereduces the emissions of gas, smoke and dust associated with other types of furnaces.
Induction melting furnaces operate on a radically different principle to the cupola version. The induction furnace uses coil heating elements embedded within a crucible or integrated into the walls of the heating chamber itself and produces a magnetic field. These convert electrical energy into heat which is radiated through the material with an outstanding degree of thermal uniformity. The magnetic field can change directions depending on the direction of the current flow. An alternating current that passes through the coil causes a magnetic field that changes in the same direction at the same speed as the current. For instance, a magnetic field switches directions 60 times a second if the current is 60Hz AC.
Metal melts at different temperatures and may require certain types of melting furnaces. Metal melting requires a lot of heat. Melting furnaces commonly used in melting metals are; induction, cupola, electric arc furnaces, etc.
The induction heating is an efficient process of melting metals. Induction heating has a minimal wasted energy with direct transfer of energy to the part being heated. This high efficiency results in significant power savings. Induction heating proves to be a highly efficient method for industrial heating applications.
Compared to torch and oven heating, induction heating has a number of advantages, such as; induction transfers more power to the load, no ramp up, does not heat up a working environment that may lead to energy wastage.
Induction furnaces do not have a limit to the temperature that they can melt. The gold melting machinetemperature can be as high as 3000 degree celsius. Therefore making it suitable for precious metal melting. For platinum group melting, the required heating temperature is usually 2000 degree celsius.
Crucibles for metal melting generally have a higher melting temperature compared to the material being melted. Crucibles for melting metal in a jewelry furnaceare graphite crucibles, silicon carbide crucible, quartz crucible, etc.
The induction furnace is heated faster and has a higher thermal efficiency. The heat in this furnace is generated inside the furnace so that heating speed is high. In an electric arc furnace, the heat of the arc after the material is cleared must be transferred to the molten metal through the slag which is indirect heating. Thermal efficiency is poor as heat of arc is lost through furnace cover and wall.
Melting and smelting are similar terms used to convert a solid material into liquid especially in metallurgy. Melting simply means the process of converting the entire solid material into liquid when heating in agold melting machine. Melting is also called fusion. During melting, the internal energy of the substance increases by heating.
Smelting on the other hand is not only the conversion of solid material into liquid state but also removes metal from its ore in its purest form. An ore is a naturally occurring solid mineral from which a metal or valuable mineral can be extracted. The smelting process has two requirements; heat treatment and reducing agents.
Borax plays an important role during the gold refining process. Borax is placed along with gold ore in a crucible and then heated. The heating action is what triggers the borax to work. The borax is responsible for separating the gold from its ore and purifying the metal. As all material melt down, they separate from one another. As the process continues, the borax causes the other minerals to oxidize and break down even further. Gold is unaffected by this reaction, it sinks to the bottom of the crucible intact.
Due to the affordability of borax and effectiveness at extracting gold, borax-based refining technique was popular during the 19th century gold rush. It still continues today among individual prospectors and different scales of mining operations.
After the slag has been heated for long enough, the molten gold begins to dissolve away. Allow the gold to slip down into the smelting vessel. After this has occurred, allow the gold to cool, remove from the smelting vessel and remove the slag.
Unwanted gold can be melted and used to make other types of jewelries. Gold jewelry can be melted using the following methods: propane torch, gold melting machine, resistance furnace or a 1200 watt microwave oven.
Of all the methods of melting gold jewelry, the gold melting machine method is highly recommended. The gold melting machine is highly efficient for both small and large size gold production. This method is also efficient because the heating system is produced from the alternating magnetic current and directed into the crucible, hence no energy is lost.
A process of separating gold from its ore is referred to as cupellation. This process involves treating ores under high temperatures to separate noble metals such as gold and silver from base metals. Base metals such as copper, zinc and lead will oxidize whereas noble metals will not oxidize. Cupellation involves melting gold ore at temperatures in excess of 960 degree celsius, at this temperature, the base metals oxidize while the gold remains on top of the solution. In other words, gold is extracted from its ore and heated in an induction furnace at 1064 degree celsius, in order to elevate the gold above its melting point.
Many impurities are burned off in the furnace, other metals remain. Gold ore extracted from mines in the earth contains a significant amount of impurities, including traces of other metals. In order to separate the gold from other metals, chemicals such as cyanide solution or mercury are introduced to the gold. This process causes the gold to coagulate, and form nuggets and clumps of gold.
Another process of removing impurities out of gold is to place thegold ore in a crucible. Put the crucible in agold melting machine. Heat to 1,100 degrees Celsius. Dross will rise to the surface. Periodically remove the crucible from the furnace and skim the impurities off the surface of the molten gold. Stir the gold after each removal of dross and before returning it to the furnace. Repeat this process until dross stops rising to the surface.
Faster charging speed- charging should be done rapidly and metal should be put into the furnace as fast as the furnace is able to melt it under full power. A faster automatic charging system can reduce energy consumption.
Avoid overfilling- Overfilling the furnace, that is, having cold charge materials lying above the upper melt line level recommended by the furnace manufacturer will cause wasted energy. The problem is twofold. First, this will cause overheating of the jewelry melting furnace components in the top part of the furnace leading to energy loss. Second, with the furnace overfilled, the lid cannot be closed.
Keep a lid on- The best way to reduce heat loss through radiation is by keeping the lid on. This means closing thejewelry melting furnacelid very quickly after adding charge material and after taking temperatures or adding alloying materials.
In the electric arc furnace, the heat of the arc after the material is cleared must be transferred to the molten metal through the slag, which is indirect heating. Thermal efficiency is poor. The furnace is in the shape of a basin, and plenty of the heat of the arc is lost through the furnace cover and the furnace wall. While the induction furnace is heated faster and has higher thermal efficiency. The heat is generated in the furnace, so the heating speed is high.
One of the advantages of thegold melting machineis its use of less electricity compared to other types of furnaces. The heat generated by the furnace is used within thejewelrymelting furnace, no heat escapes to cause extra electricity charges. The jewelry melting furnaceis highly energy efficient and can help you save up to 50% of energy used in smelting and melting metals. The jewelry melting furnaceis integrated with a power supply capable of producing heat with lower rates of heat loss. For instance, a gold melting machinecan melt metal of up to 1450 degree celsius using less than 600kWh of electricity.
Gold melts at 1064 degree celsius. The boiling point of gold occurs at 2845 degree celsius. Pure gold melts at 1064 degree celsius but if other alloys are present (copper is the most commonly used base metal), then the temperature required to melt gold will vary. Due to the softness of pure gold (24 karat), it is usually alloyed with base metals for use in jewelry thereby, altering its ductility, melting point, colour and other properties. Alloys with lower karat ratings, for instance 22k, 18k, 14k or 10k contain higher percentages of copper or other base metals or silver or palladium in their alloys.
The melting of gold is not the only method to regain raw material for the production of new jewelry, coin, industrial or dental gold. Another method of determining the degree of purity and quality of gold is through the XRF analysis method.
Borax allows you to melt your gold in a pure and harmless manner. The quantity of borax for melting in a gold melting machinewill be determined by the quantity of gold to be melted. With some borax and heat, it is possible to extract gold from a simple ore. Once the borax melts, it lowers the melting temperature of everything in the ore.
Generally when melting gold, a small amount of borax is needed for melting. Traditionally, for gold melting, flux mixture should contain 40 to 50% of borax, 10 to 15% of soda ash and 1 to 5% of silica.
Smelting gold is accomplished by using high pressure, heat and various chemicals to break down the ore and melt the gold to separate it from impurities. To extract gold from its ore, the temperature must be at1046 degree celsius.
The first step in the process of smelting gold is the preparation of flux. The most common forms of flux used in gold smelting are borax, sodium nitrate, and silica. The percentage of these fluxes varies and it depends on the composition of the precipitate. These fluxes are necessary to bring impurities to the surface.
When the mixture of the flux and gold are placed in a gold melting machine, both materials melt in the furnace. Thejewelry furnaceis heated to high temperatures exceeding 900 degree celsius. After the mixture melts, the precious metal and impurities separate. This is the aim of the entire procedure. Gold is denser than most impurities in it. This allows the gold to settle down.
In the smelting process, the most important aspect is separating the impurities and flux from gold. Gold settles at the base of the crucible after melting, this makes it easy to drain the impurities that have risen to the top. This leaves the gold at the bottom of the furnace crucible that can be poured into a mold.
A cast iron can be used for smelting gold but it is recommended to use a graphite crucible for smelting. Using a cast iron will result in loss of precious metal, contamination of precious metal and a slower smelting process. For an effective smelting process, a cast iron cannot fit into a jewelry cruciblerather an open stove or kiln, which cant really get to the temperature you need to smelt gold. Smelting in a cast iron will not remove any impurities.
Using a cast iron for smelting can cause the cast iron itself to reach its melting point before completing the gold smelting process. Therefore, we recommend you use a graphite crucible for smelting gold.
To smelt your gold at home, you need access to a high temperature gold and silver smelting equipment. Determine the size of silver you want to smelt. This will tell the size of the smelting equipment you need. Although most do it yourself smelting requires a mini sized furnace.
You can remove the most common metal in silver ore using elements that bond with oxygen at lower temperatures than silver. This oxidation process will make copper oxide, zinc oxide and lead oxide to float on top of the crucible allowing the slag to be removed.
Load the solid silver ore into your crucible and set in the smelting equipment. Silver melts at 962 degree celsius. Heat up the smelting equipmentand allow the silver to melt. When the mixture becomes liquid, impurities from the silver ore rises to the surface and can be skimmed off to leave pure silver behind.
Gold melts at a temperature of 1064 degree celsius while silver melts at 961.8 degree celsius. To alloy these two metals, melt the gold to hot liquid, add the silver metal. This will dissolve immediately in the blazen liquid gold.
Once the flames turn from bright orange to a bright yellow, this confirms that your metal is thoroughly atomically combined which is important to assure a well-rounded metal alloy. If the metals are not well blended, they may be problematic at the production phase.
Maximize the use of your smelting equipment- One of the best ways one can reduce how much energy their smelting equipmentuses is by using the equipment more effectively. Short holding times can improve the efficiency of your smelting equipment, because longer holding time requires more energy consumption.
Make any necessary changes to your operating procedures- Another great way to reduce your smelting equipmentenergy consumption is by replacing your current melting equipment. Ensure you give your foundry a thorough investigation to determine some of the best operational changes that you can make to cut down on energy use.
Boost your charging speed- Apart from long holding times, charging speed can also have a major impact on the use of your smelting equipment. Long charging times caused by manual or magnetic crane charging can lead to more energy use. You want your charging to be done rapidly and efficiently, use automatic charging systems.
Streamline your temperature measurement- When you check the temperature of the smelting equipmentregularly, you are losing valuable time and wasting needed energy. By using a computerized temperature control system, you can reduce the need to check furnace temperature.
Different methods can be used to melt gold dust; gas torch, gas furnace, electric furnace, coal furnace. Gold dust can be wasted when melted with a gas torch. Here is how to melt gold dust using a induction furnace:Add a very little amount of borax into the furnace before placing your gold dust.You can go ahead to add some flux, flux is a mixture of borax and sodium carbonate. You can mix it with gold dust before melting or during melting.Go ahead and melt the content of the crucible.
Induction heating can be as low as 100 degree celsius and as high as 3000 degree celsius. The temperature of a gold smelting equipmentwith a graphite crucible can reach 1600 degree celsius suitable for melting gold, silver, stainless steel and copper. Higher melting metals such as platinum group metals whose melting temperature can reach 2000 degree celsius can be melted easily with an induction heat.
gold smelting kits - gold prospecting mining equipment detectors snake protection
Spiral panners and other equipment work, but can be a little slow. Did you know there's another method to consider? Burn it with the new Microwave Gold Smelting Kiln and Kit! Keep the nuggets and pickers and smelt the rest! All you need is a 1200 watt microwave with the magnetron on the side or rear (a magnetron on the top doesn't work as well) that is located out in your garage or shop (don't use the one in your kitchen), a few tools, and you are on your way to smelting your own gold at home! Watch the video first to get an overview of how the process works, then read the details below...
First of all, you must have gold or silver in your concentrates to begin with and the more of it the better. The microwave gold smelting kiln is a tool for smelting only. It does not separate out the precious metals that are in your concentrates. You still need to have your end product called "buttons" assayed to determine its purity and content. You can also use the Microwave Gold Smelting Kit to smelt precious metals from computer parts, from old beat-up coins you cannot sell, from old sterling silver silverware, and from your unwanted scrap gold and silver jewelry (use wire cutters to cut the chains into one inch pieces). You may want to check out our Gold Testing Kits.
Always wear protective clothing and eye protection when using the Microwave Gold Processing Kit! A description of the Kit's main components are as follows:
The gold smelting kiln is comprised of the highest quality, high density, no-smoke, high temperature refractory ceramic fiber kiln lining insulation available that is microwave transparent (allows microwaves to go through the material). It has been coated with a silica based rigidizer at the factory to improve the compressive strength of the fiber board and to minimize the potential of dusting, and is suitable for applications up to 2300F (1260C). The kiln acts as a thermal insulator to prevent the microwave from being damaged and overheating during the smelting process. Kiln is 9.5 inches tall.
The kiln shelf is made of high alumina, which is microwave transparent (allows microwaves to go through the material). It is dense and less susceptible to warping and is safe to use up to 2400F degrees. Your kiln shelf should be dry and protected from moisture at all times. Due to the high temperatures achieved in the microwave process, all kiln shelves will eventually crack due to thermal shock and you may notice a small hairline crack after using it. This is cosmetic only and does not affect the structural integrity of the shelf.
Flux material (specially formulated and designed for the microwave process) is mixed with your concentrates before smelting. The flux protects the crucible, allows plasma arcing to occur, and refines the gold processed to a higher degree of purity. When firing, black sands concentrates, iron oxides, etc. are held in suspension by the flux so that the precious metals can be separated and poured into the mold as liquid metal. Store the flux in a dry and safe location, away from children and pets. Wear your dust mask and gloves when mixing the flux and concentrates together.
Crucibles go into the kiln and are the "clay pots" that contain your mix of flux and concentrates (or scrap jewelry or old coins you want to melt down). Crucibles can be used several times until the wall becomes too thin. Flux coating on the inside helps them last. Only clay crucibles are microwave transparent (allows microwaves to go through the material). The crucible inside the kiln will ultimately reach temperatures in excess of 2300 degrees Fahrenheit! Make sure there is 1 of space between the top of the crucible and the kiln lid. When crucibles are placed inside the kiln, they absorb most of the microwave energy and only allow a small amount ofit to pass through them into the interior where the conductive flux and metals are contained. As a result the crucibles will get very hot, however the plasma arcing that takes place inside of clay crucibles is greatly reduced. In other words, your heat is now a radiant heat from the crucible penetrating inward, rather than the plasma arcing and heating taking place directly inside of the clay type crucible. Always keep your crucibles completely dry; the slightest bit of moisture can cause a crucible to crack upon heating. Season crucibles before use be heating the empty crucible inside the kiln in microwave for 15 minutes. Remove the kiln and crucible from the microwave and allow it to cool. Repeat this process again for15 minutes the second time. This drives off any moisture in the crucible, making it ready to receive its first charge.
The conical mold is cast iron. Always pre-heat the cast iron mold to drive off any moisture before pouring into it and to prevent HOT splatters from occurring. After pouring the molten flux mixture into the conical mold, the cooling process begins. The molten flux is actually a form of borosilicate glass and, during the cooling process, the glass will shrink and crack. Often times during the cooling period, small shards of glass will fly outward, so keep kids and pets out of the area and wear safety goggles and protective clothing. After the mold and the borosilicate glass have cooled, invert the mold and the conical shaped glass will drop out of the mold. The smelted metal button of gold or silver will be on top of the conical shaped glass. Shop for other molds on Amazon.
Download a .pdf here containing more instructions and details about the Microwave Gold Kiln Process.
DISCLAIMER: No guarantee is given on the amount of gold or silver obtained from this process, as it depends upon the quality of your concentrates. The kiln is not a toy and is not to be used by children. This kiln generates temperatures in excess of 2300 degrees! Please do not allow children or pets in the room when you are firing! Use at your own risk and follow all recommended and common-sense safety precautions. Seller and manufacturer are not responsible for accidents or injuries caused by hot kilns. By purchasing the Microwave Gold Kiln or Kits, the purchaser acknowledges this and agrees to use at his or her own risk.
Sensor or Inverter microwaves will only operate at high power for approximately 30 minutes. After 30 minutes or so, the microwave will reduce the power output to 80% and begin to cycle the magnetron on for 20 seconds, then, off for 10 seconds. You cannot reach smelting temperatures operating on lowered power output like that in a reasonable time frame. Simply stopping the microwave and resetting the time and power level will not force the microwave to operate at the full power output mode.
Additionally: Elevate the microwave a couple of inches off the surface and place a small fan behind it to dissipate the heat coming from the microwave and help keep the magnetron cooler while operating.
The definitive book on how to perform fire assays inside a microwave, along with cupelling with the new Kwik Kiln. This book can be included with your Microwave Kiln or Kwik Kiln. Click here to purchase.
Book Review - May 2014
"A very thorough yet concise book written by inventor and prospector Patrick Moulton. At 92 pages, this book is not like most books about fire assay which typically speak over the average prospector's head. Moulton has done an excellent job giving readers technical specifications for proper noble mineral recovery from a variety of common ores without the reader becoming confused. The book includes information in technical terms and general terms so readers can comprehend the process of melting metals and processing ore through a fire assay. Very helpful information on how to mix fluxes, prepare your crucible, melt gold and silver, and how to stay safe doing it. Additionally, Moulton introduces two pieces of equipment every small scale miner should own: The Microwave Gold Kiln and small Kwik Kiln. Both furnaces offer the sampling or melting of small batches of material without expending a tremendous amount of energy or time. This book explains the fundamentals of the fire assay and cupellation process in terms even beginners can understand, but provides enough information for a lifetime. Two thumbs up! " - Josh Turpin, High Plains Prospectors, LLC
gold processing,extraction,smelting plant design, equipment for sale | prominer (shanghai) mining technology co.,ltd
Prominer maintains a team of senior gold processing engineers with expertise and global experience. These gold professionals are specifically in gold processing through various beneficiation technologies, for gold ore of different characteristics, such as flotation, cyanide leaching, gravity separation, etc., to achieve the processing plant of optimal and cost-efficient process designs.
Based on abundant experiences on gold mining project, Prominer helps clients to get higher yield & recovery rate with lower running cost and pays more attention on environmental protection. Prominer supplies customized solution for different types of gold ore. General processing technologies for gold ore are summarized as below:
For alluvial gold, also called sand gold, gravel gold, placer gold or river gold, gravity separation is suitable. This type of gold contains mainly free gold blended with the sand. Under this circumstance, the technology is to wash away the mud and sieve out the big size stone first with the trommel screen, and then using centrifugal concentrator, shaking table as well as gold carpet to separate the free gold from the stone sands.
CIL is mainly for processing the oxide type gold ore if the recovery rate is not high or much gold is still left by using otation and/ or gravity circuits. Slurry, containing uncovered gold from primary circuits, is pumped directly to the thickener to adjust the slurry density. Then it is pumped to leaching plant and dissolved in aerated sodium cyanide solution. The solubilized gold is simultaneously adsorbed directly into coarse granules of activated carbon, and it is called Carbon-In-Leaching process (CIL).
Heap leaching is always the first choice to process low grade ore easy to leaching. Based on the leaching test, the gold ore will be crushed to the determined particle size and then sent to the dump area. If the content of clay and solid is high, to improve the leaching efficiency, the agglomeration shall be considered. By using the cement, lime and cyanide solution, the small particles would be stuck to big lumps. It makes the cyanide solution much easier penetrating and heap more stable. After sufficient leaching, the pregnant solution will be pumped to the carbon adsorption column for catching the free gold. The barren liquid will be pumped to the cyanide solution pond for recycle usage.
The loaded carbon is treated at high temperature to elute the adsorbed gold into the solution once again. The gold-rich eluate is fed into an electrowinning circuit where gold and other metals are plated onto cathodes of steel wool. The loaded steel wool is pretreated by calcination before mixing with uxes and melting. Finally, the melt is poured into a cascade of molds where gold is separated from the slag to gold bullion.
Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.