Gold Refining

by

Donald Clark MME

Softcover - 123 Pages

Contents:

Chapter 1

• Occurrences of Native Gold
• • Simple Methods of Purification
  • Amalgam in Battery Boxes
  • Amalgam in Pans
  • Amalgam from Copper Plates
  • The Purification of Mercury
  • Refining Retorted Gold

Chapter 2

• Refining Gold with Oxidizing and Chloridizing Agents
• • Nitre Refining
  • Refining with Mercuric Chloride
  • Refining with Ammonium Cloride
  • Refining with Iron
  • Refining with Sodium Bisulphate
  • Refining with Sodium Bisuphpate and Salt
  • Refining with Boric and Phosporic Acids
  • Refining with Boric Acid and Oxidising Agents

Chapter 3

• Sulfur Refining
• • Refining with Sulfur Alone
  • Refining with Sulfur and Other Metals
  • Refining with Sulfur and Sodium
  • Refining with Sulphide of Antimony
  • Removal of Copper from Cyanide Bullion with Sulphur

Chapter 4

• Refining with Cementation Process
• • Older Processes with Nitric
  • Other Processes with Common Salt

Chapter 5

• Refining Gold Bullion by Means of Oxygen and Aire

Chapter 6

• Millers Process of Refining
• • History of the Process
• The Methods Adopted at the Melbourne Mint
• • Receiving Gold
  • Construction of the Melting Furnaces
  • The Crucibles and Their Connections
  • The Chlorine Generators
  • Details of the Whole Operation
• Recovery of the Silver

Chapter 7

• Parting with Silver as the Alloying Metal
• Parting with Zinc as the Alloying Metal
• Parting with Sodium as the Alloying Metal

Chapter 8

• Parting with Nitric Acid on a Large Scale
• • Silver-Gold Alloys
  • Zinc Silver Gold Alloys Obtained in the Cyanide Process

Chapter 9

• Recovery of Silver from Nitrate Solutions
• • The Precipitation of Chloride of Silver
  • The Reduction of Chloride

Chapter 10

• Refining by Means of Sulphuric Acid
• • Experimental Work on Gold Silver Alloys
  • Experimental Work on Gold-Zinc Alloys
  • Experimental Work on Gold-Zinc-Silver Alloys
  • Experimental Work on Gold-Silver-Tellurium Alloys
  • Parting with Sulphuric Acid Commercially
  • The Gutzkow Process
  • The Process as Carried on in Australia

Chapter 11

• Parting Gold by Electrolysis
• • Mobius Process
  • Description of the plant
  • The Improved Process

Chapter 12

• Electrolytic Refining of Gold
• The Separation of Platinum from Gold

Chapter 13

• The Treatment of Cyanide Precipitates
• • Gold Precipitated on Zinc
  • The Clean-up of Zinc Slimes
  • Smelting the precipitate direct
  • Treatment with Sulphuric Acid
  • Effect of Sand, Lead, and Other Impurities
  • Removal of Lime and Lime Salts
  • Experiments with Caustic Soda
  • The Distillation Process

Chapter 14

• Other Methods of Refining Gold Slimes
• • Treatment with Strong Nitric Acid
  • Treatment with Strong Sulphuric Acid
  • The Removal of Copper with Sulfuric Acid and Air
  • Dissolving out Gold with Chlorine

Chapter 15

• The Nitre Cake Method of Purifying Slimes
• • Experiments to Prevent Dusting
  • The Manufacture of Nitre Cake
  • The Direct Use of Nitre Cake
  • Effect of Temperature
  • Time Required
  • Vessel Required
  • Effect of Various Impurites
  • Dry Method of Refining Slimes
  • Caldecott's process
  • Taverner's Process
  • Merril's Process
  • Slimes from Electro-refining of Copper
  • Separation of Gold and Platinum