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Before gold can even be sent into the smelter, it must also be weighed especially in the case of scrap gold, or gold sent from a customer. And the smelter is required to agree on the estimated metal to gold content prior to extraction. This is done to ensure that the customer receives a fair price for his or her gold. [http://metalrefinery.com gold refining]  They know how much the amount of the return should be and just how much should be returned. Assayers take a drilled sample of gold bullion from the customer and forward it off to a lab to determine the precious metals content within the bullion. This is the condensed refining process that permits the content of precious metals to be discovered. 

Assay results are required to agree with the numerous tests which are carried out and if the samples do not melt all the way. They repeat the process once more to cause it to homogeneous and then it is tested for a second time. Sweeps, which tend to be a lower quality gold, are incinerated to burn all combustibles then converted into a fine homogeneous powder. Following this procedure the powder can then be sent to an assayer to determine the precious metal content through samples.

As soon as the process of assaying is finished the customer who sent in the samples of gold is paid for the gold to be shipped and refined. The bullion, [http://metalrefinery.com precious metal refinery]  sweeps, and clean scrap gold are then shipped to the refiner to get turned into precious metals through the refinement process. 
There are several ways to refine gold, however the most well-liked techniques is the "Miller" process and the “Wohlwill" process. The Miller process of refining gold is fewer complexes of the two however produces a lower grade quality of gold at 99.95 percent purity. The Wohlwill process invented by Emil Wohlwill in 1875 produces a higher quality gold at 99.999 percent purity and it is done electrochemically. The Miller process is what most refinement agencies employ to refine and process gold.

Gold that is to be refined is sent to an induction furnace where chlorine gas is mixed in with all the raw material using a rotating lance. The chlorine gas is released in a cautious approach to avoid gasses from breaking through. Metals that float to the top of the melted gold are removed and placed in the slag as molten chlorides. These metals frequently include copper, nickel and even silver. Fumes from metal chlorides are filtered using either a dry scrubbing or wet filter process, which is normally carried out in two phases that allows for recovery and cleaning of exhaust air. 

Manually poured slag is allowed to cool down slowly in a crucible, where trapped gold sinks to the bottom and solidifies. Molten chloride is separated from the gold by pouring it gently into molds. Afterward the gold has cooled in the crucible; it can be manually removed and poured into ceramic filters. From the filters, [http://metalrefinery.com gold smelter]  the gold goes through one final chemical or electrolysis refinement where it is dipped in a gold-based solution. Most gold is then molded into bar form therefore it can be easily shipped and utilized by others to create jewelry.