List of Reagents PDF

Name Chemical Classification Function Melting Point/Products Remarks Formula Silica SiO2 Acid Flux Protect the crucible and scorifiers 1625...

Name Chemical Classification Function Melting Point/Products Remarks Formula Silica SiO2 Acid Flux Protect the crucible and scorifiers 1625 0C Too much of this will cause the loss of from the corrosive action of litharge bi-silicates precious metals by slagging or by matte mono-silicates Glass SiO2 same same same 5 to 10 grams too much glass is ok while 5 to 10 grams silica will spoil the assay. Borax Na2B4O7 10H2O Acid Flux It lowers the temperature of slag 560 Borax is often use as a cover for crucible formation and promotes a quiet and fusion. (ibutang xa sa ibabaw or ipatong orderly fusion. xa after na mix ang tanan nga reagents ug ang ore) Borax Glass Na2B4O7 acid flux same 742 0C cheap Sodium NaHCO3 Basic Flux Reduce the melting temperature of 276 0C cheap Bicarbonate the mixture Sodium Na2CO3 Basic Flux Desulphurizing Reduce the melting temperature of 852 0C cheap Carbonate Oxidizing the mixture Potassium K2CO3 Basic Flux Reduce the melting temperature of 849 0C More expensive than sodium carbonate Carbonate the mixture Litharge PbO Basic Flux Desulphurizing It supplies the lead necessary for 883 0C Produce bi-silicates Oxidizing the collection of gold and silver It volatilize at 800 0C This has strong affinity to silica that if the When heated with carbon, crucible does not contain enough silica, hydrogen, sulphur, metallic the litharge will attack to crucible. sulphides, iron, etc. it readily give It should be free from Bismuth up its oxygen Lead in Pb In the scorification Assay, this 326 0C Same above granular form is the collector of the precious metal Argols Bitartrate of Basic Flux Reducig agent Obtained from Wine Barrels Potassium KH C4H4O6 Cream of C4H4O6 Basic Flux tartar Charcoal, Reducing agent because of sugar, flour the carnbon that they contain. Iron Fe Desulphurizing & Reducing When heated with sulphides of agent lead , silver, mercury, bismuth and antimony, the sulphides are decompose. The result is pure metal and iron sulphide. Potassium KNO3 Oxidizing Agent 339 0C Many assayer do not like niter beause of Nitrate its tendency to oxidize silver. (NITER) Potassium KCN Reducing and Desulphurizing It combines with oxygen forming 634.5 0C Cyanide potassium cyanate Salt NaCl Use as a cover to exclude the air to wash the sides of the crucible and prevent small particles of lead from adhering to the crucible. Flourspar CaF2 Neutral Flux Very fluid and assist in liquefying 1361 0C This is doubtful because the fire assay the charge although it does not fusion temperature seldom reaches ordinarily enter into chemical 1200 0C. reaction. Cryolite AlNa3Fe6 Neutral Flux It has a property of dissolving 995 0C Alumina