REFINING TECHNIQUE
AQUA REGIA
In Aqua Regia, 99.9% pure metallic gold is obtained. This process can be employed on a large scale. A primary step of the process is to dissolve the precious metals and some impurities. Aqua Regia combines nitric acid and hydrochloric acid so that some silver remains in solution and some forms a silver chloride precipitate. Silver content must also be taken into consideration. There is no doubt that silver chloride formation negatively affects gold dissolution. As soon as the dissolution is complete, the solution and precipitate are separated by filtration. A reducing agent such as ferrous sulphate, sulfur dioxide, or sodium bisulphate is used to reduce the gold in the solution. High-purity gold powder is then obtained that can be melted. The platinum group metals remain in solution when gold precipitates, so they must be recovered in another way.
LABORATORY TESTING
X-RAY SPECTROSCOPY
There are several kinds of spectroscopic techniques that use x-ray radiation for the characterization of materials under x-ray spectroscopy. Photons, or particles of light, with wavelengths in the X-ray region of the electromagnetic spectrum are detected and measured by X-ray spectroscopy. A spectrometer helps Our experts determine the chemical and elemental properties of an object.
SPARK EMISSION SPECTROSCOPY
Through the application of an electric arc or spark to metallic samples, spark spectrometers (also called spark emission spectrometers) detect the presence or concentration of analytes based on their wavelength signature. Quantitative and qualitative analysis of metal and alloy compositions using spark emission spectroscopy.
INDUCTIVELY COUPLED PLASMA SPECTROSCOPY
Mass spectrometry using inductively coupled plasma (ICP-MS) involves ionizing a sample with an inductively coupled plasma. Known and used as a tool for detecting metals and several non-metals in liquid samples at very low concentrations, it detects metals and several non-metals. The Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) is an analytical technique used to determine the amount of certain elements in a sample.