Hardness of Gold - Tests to Measure of Hardness of Element Mohs Hardness The gold recoveries obtained on cyanidation and chloride-hypochlorite leaching were 59.6875% and 24.6875% respectively, all at the 12 hour peak.Refer to below table for Gold Physical Properties Densityġ9.3 g/cm3(when liquid at m.p density is $17.31 g/cm3) The cyanidation process was effective on the increasing time of leaching hours however the use of chloride/hypochlorite was not successful. The chemical analysis, fire assaying and Atomic Adsorption Spectrophotometer (AAS), of the solid tails and pregnant solutions were analyzed in the Assay Laboratory of the Manila Mining Corporation in Surigao. The experiment involved primary crushing of the ore, primary and secondary grinding, leaching and chemical analysis. This project characterized the ore used and assessed the effects of increasing time on the used concentrations of the two leachants to have a comparative study on the gold recoveries between the cyanidation and chlorite/hypochlorite leaching process. The learning chemistry, silver dissolved in water to the extent of 0.07 mg liter in presence of dissolved oxygen and attacked by atmospheric sulfur compounds, mainly hydrogen sulfide (H S).Īn oxide gold ore from Placer, Surigao Del Norte was subjected to chloride-hypochlorite and cyanide leaching at room temperature at 3 different hours – 4 hours, 12 hours and 24 hours. Chemically, silver metal is quite unreactive element with chemical symbol = Ag, atomic weight = 107.868, melting point = 961.8 ☌, boiling point = 2162 ☌, and electrical resistivity = 1.67 ohm. Although the atomic states of copper, silver, and gold (noble metal family) contain ns (n-1)d outer electron configuration or filled d-subshell but they considered transition elements because in +2 and +3 oxidation number or state of chemical element posses incompletely filled d-orbital. The noble metal, silver form an FCC crystal lattice structure with characteristic silvery-white colour. The name silver comes from Assyrian serpu or Gothic silbur meaning white and from Latin name, Argentum means shiny white (Greek latter Argos). Silver (Ag), atomic number 47, the shiny white, lustrous metal of Group 11 or IB in periodic table chemical element uses from the ancient age to jewelry, coinage (decorative beauty), and electrical conductivity. In learning chemistry, the characteristic golden yellow color of gold arises from the absorption in the UV and blue regions of the electromagnetic spectrum corresponding to the excitation of electrons from filled d-band to s-p conduction band.-3 The metal from fcc crystal lattice in the solid form is known for its characteristic color. The good conductor of specific heat and electricity gold has the chemical symbol Au, atomic number 79, atomic weight 196.967, melting point 1064 ☌, boiling point 2808☌, valence shell electron configuration 4f 5d 6s, and common oxidation number state +3. The purity of metal expressed in carats, pure gold is 24 carat and common alloyed form with copper is 22 carat. The chemically unreactive, extremely malleable, ductile, high density (19.32 gm cm), attractive golden-yellow color, and bright metal gold found in nature's very pure form. Copper, silver, and gold constitute the family of the coinage of currency metals and occurs in nature in a native form with very similar chemical and physical properties in chemistry. The name gold is derived from the old English word geolu means yellow and from the Latin word aurum. Gold (Au), chemical element, the yellow precious metal of Group 11 or 1B, and period 6 of the periodic table uses widely from ancient history in jewelry or coinage production.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |