How to Fire-Start KK-8 | Initial Firing
As previously mentioned in the introduction, the insulation comprising the lining of the kiln is composed of a micro-fiber alumina silicate refractory material. Under a microscope, these fibers resemble quartz crystals and, when heated to the temperatures the kiln operates at, a portion of these fibers fuse together. When the fibers fuse together, some of […]
Starting OR Firing the Small KK-8 Propane Furnace Kiln
Step 1. Place the kiln on a sturdy, level, fireproof surface. A minimum of 2’ x 3’ is necessary for the kiln, burner and pyrometer. The kiln is a modular design and comprised of three pieces; the base, the body and the lid. The body and lid are removable together or separately and allow for […]
Propane Melting Furnace Kiln – Small Fire Assay Furnace
Propane Melting FurnaceThe burner supplied with the KK-8 is unique in its design and is comprised of a bi-metal construction. The burner is constructed of mild steel with a brass nozzle tip in order to eliminate the corrosive environment created by the use of a conventional steel or stainless steel burner nozzle with the […]
Gold/Silver Leaching with Sodium Zinc Cyanide
Dissolution of Precious Metals in Sodium Zinc Cyanide: The dissolving effect of sodium zinc cyanide on precious metals has been the subject of much discussion. According to one researcher, pure K2Zn(CN)4 in the presence of oxygen dissolves gold with the formation of gold potassium cyanide and zinc oxide. Another researcher compared the dissolving effects of KCN and […]
Titration of Cyanide Solutions
Titration of Cyanide Solutions Containing Dissolved Zinc: Sodium zinc cyanide reacts with silver nitrate to precipitate zinc cyanide: Na2Zn(CN)4 + AgNO3 = Zn(CN)2 + NaAg(CN)2 + NaNO3 In the presence of an alkali, considerably more silver nitrate must be added to sodium zinc cyanide before a precipitate is formed. Many investigators have claimed that this […]
Effect of Temperature on Gold Cyanidation
When heat is applied to a cyanide solution containing metallic gold, two opposing factors affect the rate of dissolution. The increase in temperature would be expected to increase the activity of the solution and thus increase the rate of dissolution of gold. At the same time the amount of oxygen in the solution would decrease […]
Effect of Oxygen on the Dissolution of Gold
In discussing the effect of oxygen on the gold dissolution, one can understand the use of oxygen or an oxidizing agent is essential for the dissolution of gold under normal conditions of cyanidation. Such oxidizing agents as sodium peroxide, potassium permanganate, bromine, chlorine have been used with more or less success in the past; but […]
Flotation Time Scale-up Factors – Laboratory to Plant
Using Laboratory bench-top float test results and their retention (flotation) time to scale-up to real life full scale plant time can be done using the following tables and examples. How to select the proper scale-up factor takes experience and …. good data. Figure 16.7 was used and seen in the a technical report for the Pebble […]
Procedure Residual Copper Soluble Analysis -Assay Method -Acid
METHOD for SEQUENTIAL AND RESIDUAL COPPER ANALYSIS PURPOSE: To determine, through sequential dissolution, the probable copper distribution by copper mineral in a sample. SCOPE: Matrix: Copper ores Analyte: Copper (Cu) Range: <1-20%. Accuracy/Precision: This method is not intended to be accurate since there is not one standard procedure for the determination of non-sulphide copper. […]
Bond Work Index Formula-Equation
What is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: You can read all the details of this now “Biblical” grinding power requirement calculation formula in Fred Bond’s original paper. You can also review the step-by-step Bond Work Index Test Procedure I posted here. See this useful summary Table of Bond Work […]